Steam supply circuit from a turbine

Abstract

The technical field of the invention is steam turbines including a steam feed circuit based on a functional steam generator set that may be nuclear- or fossil-fuel powered, and in particular a steam feed circuit (1) of a turbine (2), comprising n main steam lines (3) and n steam admission lines (4) to the turbine, the number n of steam admission lines (4) to the turbine being strictly greater than the number n of main steam lines (3), characterized in that there are n direct steam admission lines (5) to the turbine linking the as main steam lines (3) directly to the steam admission lines (4) to the turbine.

Claims

1. A steam feed circuit of a turbine comprising n main steam lines in parallel and n steam admission lines to the turbine in parallel, the number n of the steam admission lines to the turbine being strictly greater than the number n of the main steam lines diverting from a steam generator; wherein there are n direct steam admission lines directly connected to each of the main steam lines; and nn indirect steam admission lines configured to receive at least a portion of steam from each of the n main steam lines and provide the received steam to the turbine and also to at least one feed line enabling a device other than the turbine to be supplied with steam.

2. The steam feed circuit according to claim 1, wherein each of the n main steam lines are directly connected to a steam generator.

3. The steam feed circuit according to claim 1, wherein each of the n steam admission lines are directly connected to a first stage of the turbine.

4. The steam feed circuit according to claim 1, wherein the nn indirect steam admission lines are configured to receive at least a portion of steam from at least one of the n direct steam admission lines via at least one diverted steam line tapped onto said at least one of the n direct steam admission line.

5. The steam feed circuit according to claim 4, wherein the at least one diverted steam line is configured to supply team to other auxiliary steam users.

6. The steam feed circuit according to claim 1, wherein n is between 2 and 6 and/or n is between 3 and 8.

7. The steam feed circuit according to claim 1, wherein n=n+1.

8. The steam feed circuit according to claim 4, wherein the indirect steam admission lines are fed by n diverted steam lines tapped onto the n respective direct steam admission lines to the turbine.

9. The steam feed circuit according to claim 1, wherein n=n+2.

Description

SHORT DESCRIPTION OF THE FIGURES

(1) Other features and advantages of the invention are set out in the description below, provided with reference to the attached figures in which:

(2) FIG. 1 is a diagram of a steam feed circuit of a turbine according to a known embodiment in the prior art in which n=n+1=4;

(3) FIG. 2 is a diagram of a steam feed circuit of a turbine according to a known embodiment in the prior art in which n=n+1=3;

(4) FIG. 3 is a diagram of a steam feed circuit of a turbine according to a known embodiment in the prior art in which n=n+2=4;

(5) FIG. 4 is a diagram of a steam feed circuit of a turbine according to an embodiment proposed herein in which n=n+1=4;

(6) FIG. 5 is a diagram of a steam feed circuit of a turbine according to an embodiment proposed herein in which n=n+1=3;

(7) FIG. 6 is a diagram of a steam feed circuit of a turbine according to an embodiment proposed herein in which n=n+2=4;

(8) FIG. 7 is a general diagram of a steam cycle in an electricity generation installation including a turbine supplied with steam from a steam generator via a feed circuit according to one embodiment.

(9) For the sake of clarity, identical or similar elements are marked with identical reference signs on all of the figures.

DETAILED DESCRIPTION OF AN EMBODIMENT

(10) FIG. 4 is a diagram of a steam feed circuit 1 of a turbine 2 driving a generator according to an embodiment in which n=n+1=4. Furthermore, the heat source of the functional steam-generator set supplying the turbine 2 in question is in this case a nuclear source. Indeed, in this embodiment of the invention, the number n of steam admission lines 4 to the turbine 2 is four and the number n of main steam lines 3 is three. More specifically, the three main steam lines 3 are linked directly to three of the four admission lines 4. The steam feed circuit 1 to the turbine 2 therefore includes three direct admission lines 5.

(11) The admission line not linked directly to a main steam line 3 is linked indirectly to said main steam lines 3 by means of three diverted steam lines 8, each tapped 9 onto one of these three direct admission lines 5, this line being the indirect admission line 7 fed by said three direct lines 5.

(12) A feed line 10 directed towards other steam users is also tapped onto the indirect admission line 7.

(13) For the sake of clarity in the figures, the fine arrows parallel to the steam lines indicate the direction of steam flow in said lines.

(14) FIG. 5 is a diagram of a steam feed circuit 1 of a turbine 2 driving a generator according to an embodiment of the invention in which n=n+1=3. Indeed, in this embodiment of the invention, the number n of steam admission lines 4 to the turbine 2 is three and the number 11 of main steam lines 3 is two. In this arrangement, in which n=n+1, the features are similar to n=n+1=4 (FIG. 4).

(15) FIG. 5 is a diagram of a steam feed circuit 1 of a turbine 2 driving a generator according to an embodiment in which n=n+2=4. Furthermore, the heat source of the functional steam-generator set supplying the turbine 2 in question is in this case a fossil fuel source. Thus, in this embodiment, the number n of steam admission lines 4 to the turbine is four and the number in of main steam lines 3 is two. In this arrangement there are still as many direct steam admission lines 5 to the turbine 2 as main steam lines 3, i.e. two. Moreover, the other two admission lines are therefore indirect, referred to as indirect admission lines 7, and fed by tapping 9 onto a direct admission line 5 by means of a diverted steam line 8. These two indirect admission lines also each have a feed line directed to other users.

(16) FIG. 7 is a general diagram of a steam cycle 11 in an electricity generation installation including a turbine 2 supplied with steam from a steam generator 12 via a feed circuit 1 according to one embodiment. More specifically, a steam generator 12 delivers high-pressure steam to a turbine 2 by means of a main steam feed circuit 1, the steam admission flow to the turbine being regulated by admission valves 6. The pressurized steam passing through the turbine 2 drives a generator 13 that is able to generate electricity. At the output of the turbine 2, the depressurized steam is condensed in a condenser 14 coupled to a heat sink 15. One or more pumps supply the steam generator 12 with condensed water taken from the condenser 14 through pipes 16, it being possible in particular to incorporate heaters and/or gas purgers (not shown in this figure) into these pipes 16.

(17) Numerous modifications may be made to the embodiments described above without moving outside the scope of the invention.

(18) Accordingly, the general shapes of the pipes are shown exclusively for illustrative purposes.

(19) Moreover, the angle of the various taps need not necessarily be a right angle.

(20) Moreover, the number of feed lines directed to other steam users tapped onto the indirect admission line may be variable.

(21) Finally, the invention does not require that the flow rates in each of the valves of the initial arrangement be equal no that the related pipe sections be equal.