Heat exchanger system

Abstract

The invention relates to a heat exchanger system (1) for heat exchange between at least a first medium (M), in particular in the form of a hydrocarbon-rich phase, and a second medium (K), with at least first and second pipe space sections (101, 103; 103, 105) for accommodating the first medium (M), and with a first pipe space section connecting means (102; 104), via which the two pipe space sections (101, 103; 103, 105) are connected to one another in a flow-guiding manner. The first pipe space section (101; 103) is surrounded by a first shell space (201, 203), and the second pipe space section (103; 105) is surrounded by a second shell space (203, 205) for accommodating the second medium (K). The first shell space (201; 203) is defined by a first shell (301; 303) and the second shell space (203; 205) is defined by a second shell (303; 305).

Claims

1. A heat exchanger system (1) for heat exchange between at least a first medium (M), and a second medium (K), said system comprising: at least two first pipe space sections (101, 103; 103, 105) for accommodating the first medium (M), and a first pipe space section connecting means (102; 104), via which the two first pipe space sections (101, 103; 103, 105) are connected to one another in a flow-guiding manner, wherein said first pipe space section connecting means is in the form of at least one pipeline; wherein one of said two first pipe space sections (101; 103) is surrounded by a first shell space (201, 203) for accommodating the second medium (K), and the other of said two first pipe space section (103; 105) is surrounded by a second shell space (203, 205) for accommodating the second medium (K), wherein each of said first shell space (201, 203) and said second shell space (203, 205) has a longitudinal axis, wherein said one of said two first pipe space sections is in the form of a wound pipe bundle in which individual pipes are wound around a central pipe extending along the longitudinal axis of said first shell space, and said other of said first two pipe space sections is in the form of a wound pipe bundle in which individual pipes are wound around a central pipe extending along the longitudinal axis of said second shell space, wherein said first shell space (201; 203) is defined by a first shell (301; 303) and said second shell space (203; 205) is defined by a second shell (303; 305), and said first shell space and said second shell space are separate from one another, wherein said second shell (303; 305) is arranged in the vertical direction (Z) a distance above said first shell (301; 303), and said first and second shell spaces (201, 203; 203, 205) are connected to one another in a flow-guiding manner by a first shell space connecting means (202; 204), wherein said second shell (303) has a means for separating the second medium (K) flowing through said second shell space (203) into a liquid fraction of the second medium (K) and a gaseous fraction of the second medium (K), and said means for separating is (a) an expanded region in a lower section of said second shell space (203), or (b) a separator arranged below said wound pipe bundle in said second shell space, wherein said first shell space connecting means (202; 204) is in the form of pipelines, said first shell space connecting means provides for transport of the gaseous fraction of second medium (K) and transport of the liquid fraction of second medium (K) from a lower section of said second shell space (203, 205) to an upper section of said first shell space (201, 203), wherein the gaseous fraction of second medium (K) is transported separately from the liquid fraction of second medium (K) via said first shell space connecting means.

2. The heat exchanger system according to claim 1, wherein said first shell (301) provides heat exchange for pre-cooling of the first medium (M) in said one of said two first pipe space section (101) within said first shell (301), and wherein said second shell (303) provides heat exchange for liquefying the first medium (M) in said other of said two first pipe space section (103) within said second shell (303).

3. The heat exchanger system according to claim 1, wherein said first shell (303) provides heat exchange for liquefying the first medium (M) that is guided in said one of said two first pipe space section within said first shell (303), and said second shell (305) provides heat exchange for subcooling first medium (M) that is guided in said other of said two first pipe space section (105) within said second shell (305), said first shell (303) further comprises a second pipe space section (123), which is surrounded by said first shell space (203), wherein a gaseous fraction of second medium (K) can be introduced into said second pipe space section (123) of said first shell (303) via a first inlet (122b) of said first shell (303), and said second pipe space section (123) within said first shell (303) runs along said first pipe space section (103) within said first shell (303), said first shell (303) further comprises a third pipe space section (124), which is surrounded by said first shell space (203), wherein a liquid fraction of second medium (K) can be introduced into said third pipe space section (124) via a second inlet (122c) of said first shell (303), and said third pipe space section (124) within said first shell (303) runs along said first pipe space section (103) within said first shell (303), said third pipe space section (124) of said first shell (303) is connected at the upper end of said first shell (303) to introduce the liquid fraction of second medium (K) into said first shell space (203), said second pipe space section (123) within said first shell (303) is connected in a flow-guiding manner via a second pipe space section connecting means (126), in the form of at least one pipeline, to a second pipe space section (127) within said second shell space (205) surrounded by said second shell (305), said second pipe space section (127) within said second shell (305) runs along said first pipe space section (105) within said second shell (305), and said second pipe space section (127) within said second shell (305) is connected at the upper end of said second shell (305) to introduce a gaseous fraction of second medium (K) into said second shell space (205), and said first shell (303) has an expanded region (320).

4. The heat exchanger system according to claim 1, wherein said second shell (303) has an expanded region in a lower section thereof.

5. The heat exchanger system according to claim 1, further comprising a separate third shell (305), said third shell (305) having therein a further first pipe space section (105) for accommodating flow of the first medium (M), said further first pipe space section (105) of said third shell (305) being connected in a flow-guiding manner to said first pipe space section (103) of said second shell (303) via a second pipe space section connecting means (104) in the form of at least one pipeline, said one of said two first pipe space section (105) within said third shell (305) is surrounded by a related third shell space (205) for accommodating second medium (K), wherein said third shell (305) provides heat exchange for subcooling the first medium (M), and said third shell (305) is arranged at some distance from said first shell and/or second shell (301, 303), whereby said third shell (305) is arranged along the vertical (Z) above said second shell (303), and said second and third shell spaces (203, 205) are connected to one another in a flow-guiding manner by a second shell space connecting means (204), in particular in the form of at least one pipeline, and said third shell (305) has a first outlet (A) for removing the first medium (M) from the heat exchanger system (1) in the form of a liquid phase.

6. The heat exchanger system according to claim 1, wherein said first shell (301) has a first inlet (E) for admitting the first medium (M), in the form of a gaseous phase, into said first pipe space section (101) within said first shell (301).

7. The heat exchanger system according to claim 1, wherein said first shell (301) further comprises therein a second pipe space section for accommodating second medium (K) in the form of a liquid fraction, said second pipe space section within said first shell (301) runs along said first pipe space section (101) within said first shell (301), and said first shell (301) has a second inlet (E) for admitting the liquid fraction of second medium (K) into said second pipe space section within said first shell (301), said second inlet (E) is connected to the bottom of a first separator (313), from which the liquid fraction of second medium (K) can be removed, and said second pipe space section within said first shell (301) is connected to the upper end of said first shell (301) to introduce the liquid fraction of second medium (K) into said first shell space (201).

8. The heat exchanger system according to claim 1, wherein said first shell (301) further comprises therein a third pipe space section for accommodating second medium (K) in the form of a gaseous fraction, said third pipe space section within said first shell (301) runs along said first pipe space section (101) within said first shell (301), and said first shell (301) has a third inlet (E) for admitting the gaseous fraction of second medium (K) into said third pipe space section within said first shell (301), and said third inlet (E) is connected to a head of a second separator (314) from which the gaseous fraction of second medium (K) can be removed.

9. The heat exchanger system according to claim 8, wherein said third pipe space section within said first shell (301) is connected, via a first outlet (122a) of said first shell (301) and a first inlet (122b) of said second shell (303), to a second pipe space section (123) within said second shell (303) that is surrounded by said second shell (303), whereby said second pipe space section (123) within said second shell (303) runs along said first pipe space section (103) within said second shell (303), said first outlet (122a) of said first shell (301) is connected via the head of a third separator (315) to said first inlet (122b) of said second shell (303), whereby a gaseous fraction of second medium (K) can be removed from said head of said third separator (315), and the bottom of said third separator is connected via a second inlet (122c) of said second shell (303) to a third pipe space section (124) within said second shell (303), which is surrounded by said second shell (303), said third pipe space section (124) within said second shell (303) runs along said first pipe space section (103) within said second shell (303), and said third pipe space section (124) of said second shell (303) is connected to an upper end of said second shell (303) to introduce a liquid fraction of second medium (K) into said second shell space (203).

10. The heat exchanger system according to claim 9, further comprising a separate third shell (305), said third shell (305) having therein a further first pipe space section (105) for accommodating flow of the first medium (M), said first pipe space section (105) of said third shell (305) being connected in a flow-guiding manner to said first pipe space section (103) of said second shell (303) via a second pipe space section connecting means (104), in particular in the form of at least one pipeline, said first pipe space section (105) within said third shell (305) is surrounded by a related third shell space (205) for accommodating second medium (K), wherein said third shell (305) is designed for subcooling the first medium (M), and said third shell (305) is arranged at some distance from said first shell and/or second shell (301, 303), whereby said third shell (305) is arranged along the vertical (Z) above said second shell (303), and said second and third shell spaces (203, 205) are connected to one another in a flow-guiding manner by a second shell space connecting means (204), in particular in the form of at least one pipeline, and said third shell (305) has a first outlet (A) for removing the first medium (M) from the heat exchanger system (1) in the form of a liquid phase, wherein said second pipe space section (123) within said second shell (303) is connected in a flow-guiding manner, via a third pipe space section connecting means (126), in particular in the form of at least one pipeline, to a second pipe space section (127) within said third shell (305), said second pipe space section (127) being surrounded by said third shell (305), wherein said second pipe space section (127) within said third shell (305) runs along said first pipe space section (105) within said third shell (305), and said second pipe space section (127) within said third shell (305) is connected at an upper end of said third shell (305) to introduce a gaseous fraction of second medium (K) into said third shell space (205).

11. The heat exchanger system according to claim 1, wherein said first shell (301) further comprises therein a second pipe space section for accommodating second medium (K) in the form of a liquid fraction, said second pipe space section within said first shell (301) runs along said first pipe space section (101) within said first shell (301), and said first shell (301) has a second inlet (E) for admitting the liquid fraction of second medium (K) into said second pipe space section within said first shell (301), said second inlet (E) is connected to the bottom of a first separator, from which the liquid fraction of second medium (K) can be removed, and said second pipe space section within said first shell (301) is connected to the upper end of said first shell (301) to introduce the liquid fraction of second medium (K) into said first shell space (201), wherein said first shell (301) further comprises therein a third pipe space section for accommodating second medium (K) in the form of a gaseous fraction, said third pipe space section within said first shell (301) runs along said first pipe space section (101) within said first shell (301), and said first shell (301) has a third inlet (E) for admitting the gaseous fraction of second medium (K) into said third pipe space section within said first shell (301), and said third inlet (E) is connected to a head of a second separator from which the gaseous fraction of second medium (K) can be removed, wherein said first shell (301) is provided with a second outlet (A) for removing second medium (K) from the bottom of said first shell (301), wherein said second outlet (A) of said first shell (301) is connected to a two-stage compressor (311, 316) for compressing second medium (K), wherein said first (313) and second (314) separators are connected via one heat exchanger (312, 317) each to the compressor (311, 316).

12. The heat exchanger system according to claim 1, wherein said first shell (301) is divided into a separate upper first shell (301b) and a separate lower first shell (301a), wherein said upper first shell (301b) defines an upper first shell space (201b) and said lower first shell (301a) defines a lower first shell space (201a), wherein said upper first shell (301b) and said lower first shell (301a) are arranged at some distance from one another along the vertical (Z), and said upper first shell space and said lower first shell space (201b, 201a) are connected to one another in a flow-guiding manner via a third shell space connecting means (211), in particular in the form of at least one pipeline.

13. The heat exchange system according to claim 12, wherein said lower first shell space (201a) surrounds a lower section (101a) of said first pipe space section (101), and said lower section (101a) of said first pipe space section (101) is connected via a third outlet (101c), at an upper end of said lower first shell (101a), to a fourth separator, wherein a gaseous fraction of the first medium (M) can be removed from the head of said fourth separator and introduced via a fourth inlet (101d) of said upper first shell (301b) into an upper section (101b) of said first pipe space section (101), which is surrounded by said upper first shell space (201b), wherein a lower section (111a) of said second pipe space section (111) is surrounded by said lower first shell space (201a), and is connected in a flow-guiding manner to an upper section (111b) of said second pipe space section (111), surrounded by said upper first shell space (201b), via a fourth pipe space section connecting means (111c), and wherein a lower section (121a) of said third pipe space section (121) is surrounded by said lower first shell space (201a), and is connected in a flow-guiding manner to an upper section (121b) of said third pipe space section (121), which is surrounded by said upper first shell space (201b), via a fifth pipe space section connecting means (121c).

14. The heat exchanger system according to claim 1, wherein the first medium (M) is a hydrocarbon-rich phase.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Various other features and attendant advantages of the present invention will be more fully appreciated as the same becomes better understood when considered in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the several views, and wherein:

(2) FIG. 1 shows a diagrammatic sectional view of a heat exchanger system according to the invention for liquefying a hydrocarbon-rich phase, and

(3) FIG. 2 shows a diagrammatic sectional view of another heat exchanger system according to the invention for liquefying a hydrocarbon-rich phase.

(4) FIG. 3 shows a flow chart illustrating the compression of the second medium K in first and second compression stages with separator after each compression stage.

(5) FIG. 4 is a flow chart illustrating the second medium being fed to a third separator and the removal of a gaseous fraction and a liquid fraction from the third separator.

(6) FIG. 5 is a flow chart the first medium being fed to a fourth separator and the removal of a gaseous fraction and from the fourth separator.

(7) FIG. 6 is a flowchart illustrating the shell space connecting means providing separate flow of gas and liquid fractions between the first and second shell spaces.

(8) FIG. 7 shows a shells having an expanded lower region.

(9) FIG. 8 show a shell having an a separator.

(10) FIG. 1 shows a diagrammatic sectional view of a heat exchanger system 1 according to the invention. The latter has three separate shells 301, 303, 305, arranged above one another, which in each case enclose a related shell space 201, 203, 205. The three shells 301, 303, 305 are essentially designed as hollow cylinders and accordingly have a longitudinal axis (cylinder axis) that runs parallel to the vertical Z (relative to a state of the heat exchanger system 1 that is arranged as shown). In addition, shells 301, 303, 305 have a circumferential wall as well as a cover and a base. The cover and the base face one another along the vertical Z and seal off the respective shell upward and downward, respectively.

(11) In each of the individual shells 301, 303, 305, or shell spaces 201, 203, 205, a wound pipe bundle is arranged, which in each case has a large number of pipes, which are wound around a central pipe.

(12) In the lowermost first shell 301 just as in the central second shell 303, the pipe or tube bundles form a first pipe space section (101,103), a second pipe space section (121, 123), and a third pipe space section (111, 124). In the topmost third shell 305, the pipe bundle forms a first pipe space section 105 and a second pipe space section 127. In this connection, the individual pipe space sections 101, 121, 111 and/or 103, 123, 124 and/or 105, 127 can be formed by groups of pipes of the respective pipe bundle.

(13) The first pipe space sections 101, 103, and 105 of the first, second and third shells 301, 303, 305 are used for accommodating a first medium M, which is preferably a hydrocarbon-rich phase that is to be liquefied. The first medium M is introduced into the heat exchanger system 1 via a first inlet E in the lower part (base) of the first shell 301 and flows upward along the vertical Z. Here, the space between the shells 301 and 303, and the space between shells 303 and 305 are bridged by first and second pipe space section connecting means 102, 104, respectively, in the form of pipelines. As a result, a pipe space passage is formed that extends along the vertical Z through the three separate shells 301, 303, 305.

(14) When flowing through this pipe space passage, the first medium M is cooled in several steps in the area of the first shell 301, liquefied in the area of the second shell 303, and subcooled in the area of the third shell 305. The liquefied phase M can then be removed from the heat exchanger system 1 via a first outlet A from the upper part of the third shell 305 (e.g., from the cover of the third shell).

(15) In the additional pipe space sections 121, 111 or 123, 124 or 127, the second medium K (refrigerant mixture) flows upward along the vertical Z and, in each case, at least a portion of the second medium K is introduced at the upper end of each shell into the respective shell space 201, 203, 205. In this manner, a portion of the second medium K can flow downward in each of the shell spaces 201, 203, 205 along the vertical Z. To achieve this downward flow through the shell spaces, the separate shells 301, 303, 305 are connected to one another by shell space connecting means. As shown in the Figures, shell spaces 201 and 203 (of shells 301 and 303) are connected via a first shell space connecting means 202 (see FIG. 6), in the form of a pipeline, and shell spaces 203 and 205 (of shells 303 and 305) are connected via a second shell space connecting means 204, in the form of a pipeline.

(16) To liquefy the first medium M, in each of the the shell spaces 201, 203, 205 the first medium M and a portion of the second medium K flow upward in the cross current flow to a portion of the second medium K that flows downward through shell spaces 201, 203, 205. The cold end of the heat exchanger system 1 thus is found at the upper end (third shell 305). The second medium K can be removed from the bottom of the first shell 301 via a second outlet A of the first shell 301 and can be separated into liquid and gaseous fractions to be able to feed the latter individually to the heat exchanger system 1. To this end, the second medium K that is removed from the bottom of the first shell 301 can be fed to a compressor (see FIG. 3). The compressor can have two compression stages. The second medium K (refrigerant mixture) that is compressed in the first compression stage 311 can be partially condensed in a secondary condenser or heat exchanger 312 against ambient air or water and fed to a first separator 313. In this first separator 313, the second medium K is separated into a gaseous fraction and a liquid fraction. The gaseous fraction is fed to the second compressor stage 316 and compressed in the latter to the desired final pressure. Also, downstream from the second compression stage 316, there is provided a further secondary condenser or heat exchanger 317, in which the compressed second medium K is preferably cooled against ambient air or water. The cooled and compressed second medium K is then fed to a second separator 314 wherein the cooled and compressed second medium K is separated into a further gaseous fraction and a further liquid fraction.

(17) From the bottom of the first separator 313, the liquid fraction of the second medium K, is removed and then introduced, via a second inlet E at the lower end of the first shell 301, into the second pipe space section 111 of the first shell 301. The liquid fraction of the second medium K flows upward along the vertical Z through the second pipe space section 111. Thereafter, the liquid fraction of the second medium K is introduced, under expansion (e.g., via an expansion valve) into the upper end of the first shell space 201 within the first shell 301. In this way, the liquid fraction of the first medium K can flow downward through the first shell space 201 and enter into indirect heat exchange with the first medium M, flowing upward through the first pipe space section 101 (as well as with the second medium K flowing upward through the third pipe space section 121 of the first shell 301). In addition, by a third inlet E at the lower end of the first shell 301, the gaseous fraction (removed from the head of the second separator 314) of the second medium K is introduced into the third pipe space section 121 of the first shell 301 wherein it flows upward along the vertical Z. Thus, as a result, a pre-cooling of the first medium M can be performed in the first shell 301.

(18) The second medium K that flows upward through the third pipe space section 121 is withdrawn from the first shell 301, via a first outlet 122a at the upper end of the first shell 301, and then separated into liquid and gaseous fractions. To this end, the second medium K can be fed via the first outlet 122a to a third separator (see FIG. 4). A gaseous fraction of the second medium K, removed from the head of the third separator 315, is then introduced, via a first inlet 122b at the lower end of the second shell 303, into the second pipe space section 123 of the second shell 303. The liquid fraction of the second medium K, removed from the bottom of the third separator 315, is introduced via a second inlet 122c at the lower end of the second shell 303 into the third pipe space section 124 of the second shell 303. The liquid fraction of the second medium K flows upward through third pipe space section 124 and is then introduced, under expansion (e.g., via an expansion valve) into the upper end of the second shell 303 and into the second shell space 203. As a result, the liquid fraction of the second medium K can flow downward along the vertical Z through the second jacet space 203, through first shell space connecting means 202, and into the first shell 301. The liquid fraction of the second medium K thereby enters in particular into indirect heat exchange with the first medium M flowing upward through the first pipe space section 103 of the second shell 303 (and with the gaseous second medium K flowing upward through the second pipe space section 123 of the second shell 303). In addition, the gaseous fraction of the second medium K flows upward through the second pipe space section 123, through a third pipe space section connecting means 126, in the form of a pipeline, and into the second pipe space section 127 of the topmost third shell 305. As a result, an additional cooling/liquefying of the first medium M can be achieved in the second shell 303. Additionally, the first shell shell space connecting means 202 can include means (e.g., in the form of a pipeline, 202a) for introducing a gaseous fraction of the second medium K, separately from a means (pipeline 202b) for introducing a liquid fraction of the second medium, from the second shell space into the first shell space. In this regard, the second shell (303) can be provided with an expanded region 320 and/or a separating system 310 in a lower section thereof for separating second medium (K) that is to flow into the first shell space (201) into a liquid fraction of second medium (K) and a gaseous fraction of second medium (K).

(19) Finally, in the third shell 305, a subcooling of the first medium M is performed. The gaseous fraction of the second medium K flows upward through the second pipe space section 127 of the third shell 305 and is then introduced, under expansion (e.g., via an expansion valve) into the upper end of the third shell 305 and into the third shell space 205. This gaseous fraction of the second medium K then flows downward along the vertical Z through the third shell space 205. In this connection, the second medium K enters into indirect heat exchange with the first medium M, flowing upward through the first pipe space section 105 of the third shell 305, whereby a subcooling of the liquefied first medium M is achieved.

(20) In principle, it is, of course, also possible to consolidate adjacent shells 301, 303, or 303, 305. Thus, for example, the first shell can form a uniform shell with the second, or the second shell can form a uniform shell with the third shell (301 and 303, or 303 and 305), in such a way that only two separate shells are present.

(21) FIG. 2 shows another embodiment, in which unlike in FIG. 1, the first shell 301 is divided into two separate shells, which are arranged at some distance from one another along the vertical Z, namely an upper first shell 301b and a lower first shell 301a. As a result, the heat exchanger system 1 includes a total of four separate shells 301a, 301b, 303, 305. By this division, the pre-cooler that comprises the first shell 301 according to FIG. 1 is divided into first and second pre-coolers. The first medium M is removed between the lower first shell 301a and the upper first shell 301b to separate and remove heavy components of the first medium M (natural gas) and to then supply the resulting gas phase to the second pre-cooler (upper first shell 301b). The two first shells 301a, 301b correspondingly form separate a lower first shell space 201a and a separate upper first shell space 201b, and these shell spaces are connected to one another in a flow-guiding manner via a third shell space connecting means 211, in the form of a pipeline.

(22) To separate the heavy components, the first medium M is introduced via a first inlet E of the lower first shell 301a into a lower section 101a of the first pipe space section 101, that lower section 101a of the first pipe space section 101. The first medium M is then removed from the lower section 101a of the first pipe space section 101 via a third outlet 101c at the upper end of the lower first shell 301a, and fed to a fourth separator 318. The gaseous fraction of the first medium M is removed from the head of the fourth separator (see FIG. 5), and is introduced via a fourth inlet 101d into the lower end of the upper first shell 301b and into an upper section 101b of the first pipe space section 101. The upper section 101b is surrounded by the upper first shell space 201b.

(23) The second medium K is introduced via the second and third inlets E, E, now at the lower end of the lower first shell 301a, into the lower sections 111a, 121a, respectively, of the third and second pipe space section 111, 121 respectively. The second medium K is introduced into lower sections 121a in the form of a gaseous fraction and into lower sections 111a in the form of a liquid fraction. The flows of second medium K from lower sections 111a, 121a are introduced, respectively, into the upper sections 111b, 121b, surrounded by the upper first shell 301b (shell space 201b), via a fourth pipe space section connecting means 111c and fifth pipe space section connecting means 121c, in the form of a pipelines, respectively. The second outlet A is now positioned at lower end (bottom) of the lower first shell 301a.

(24) The entire disclosure[s] of all applications, patents and publications, cited herein and of corresponding German Application No. 10 2011 015 433.7, filed Mar. 29, 2011, are incorporated by reference herein.

(25) The preceding examples can be repeated with similar success by substituting the generically or specifically described reactants and/or operating conditions of this invention for those used in the preceding examples.

(26) TABLE-US-00001 List of Reference Symbols 1 Heat Exchanger System 101 First Pipe Space Section 102 First Pipe Space Section Connecting Means 103 First Pipe Space Section 104 Second Pipe Space Section Connecting Means 105 First Pipe Space Section 111 Second Pipe Space Section 121 Third Pipe Space Section 122a First Outlet 122b First Inlet 122c Second Inlet 123 Second Pipe Space Section 124 Third Pipe Space Section 126 Third Pipe Space Section Connecting Means 127 Second Pipe Space Section 201 First Shell Space 202 First Shell Space Connecting Means 203 Second Shell Space 204 Second Shell Space Connecting Means 205 Third Shell Space 301 First Shell 303 Second Shell 305 Third Shell 201a Lower First Shell Space 201b Upper First Shell Space 301a Lower First Shell 301b Upper First Shell 101a Lower Section 101b Upper Section 111a Lower Section 111b Upper Section 121a Lower Section 121b Upper Section 111c Fourth Pipe Space Section Connecting Means 121c Fifth Pipe Space Section Connecting Means 211 Third Shell Space Connecting Means 101c Third Outlet 101d Fourth Inlet A First Outlet A Second Outlet E First Inlet E Second Inlet E Third Inlet M First Medium K Second Medium Z Vertical