REACTOR FOR CLEANING FLUE GAS BY A DRY OR QUASI-DRY SORPTION PROCESS

Abstract

The invention relates to a reactor for cleaning flue gases by a dry or quasi-dry sorption process, comprising a flue gas inlet (1) at the bottom of the reactor, an outlet (2) at the top of the reactor, a dry sorbent injection system (3) with at least one dry sorbent outlet (4) for injecting dry sorbent into the reactor, the at least one dry sorbent outlet (4) being arranged between the flue gas inlet (1) and the outlet (2).

Claims

1. Reactor for cleaning flue gases by injecting dry or quasi-dry sorbent into a flue gas stream, comprising a flue gas inlet at the bottom of the reactor, an outlet at the top of the reactor, a dry sorbent injection system with at least one dry sorbent outlet for injecting dry sorbent into the reactor, the at least one dry sorbent outlet being arranged between the flue gas inlet and the outlet, characterized in that a plurality of water injection nozzles are arranged beneath the at least one dry sorbent outlet, and in that the dry sorbent injection system has a plurality of dry sorbent outlets such that dry sorbent is injected at multiple locations, wherein the dry sorbent outlet has a lower discharge edge at which the flue gas stream flows along the dry sorbent outlet and at which the dry sorbent is injected into the reaction chamber, wherein the lower discharge edge extends back and forth, so that a length of the lower discharge edge projected in a vertical direction is greater than the width of the dry sorbent outlet.

2. Reactor according to claim 1, the water injection nozzles being arranged in one plane.

3. Reactor according to claim 1, the water injection nozzles being directed upwards towards the at least one dry sorbent outlet.

4. Reactor according to claim 1, the plurality of dry sorbent outlets being directed outwards towards the wall of the reactor.

5. Reactor according to claim 1, the dry sorbent injection system having a central supply line for all dry sorbent outlets, the central supply line leading into the reactor.

6. Reactor according to claim 1, wherein more than one dry sorbent injection systems are embodied.

7. Reactor according to claim 1, the water injection nozzles being arranged horizontally offset to the at least one dry sorbent outlet.

8. Reactor according to claim 1, characterized in that the reactor has a minimum flow cross section area, wherein the maximum flow cross section area of the reactor above the minimum flow cross section area is not more than 1.5 times the minimum flow cross section area.

9. Reactor according to claim 8, wherein the maximum flow cross section area above the flue gas inlet and below the at least one dry sorbent outlet is not more than 1.5 times the minimum flow cross section area.

10. Reactor according to claim 8, the at least one dry sorbent outlet being arranged within or below the minimum flow cross section area.

11. Reactor according to claim 1, wherein a plurality of dry sorbent outlets are arranged in exactly one flow channel.

Description

[0035] An exemplary embodiment of the invention is now described with regard to the figures. The figures show schematically

[0036] FIG. 1: a reactor and

[0037] FIG. 2: a cross sectional view through the reactor in top view onto the dry sorbent injection system.

[0038] The figures show a reactor for cleaning flue gases by a dry sorption process. The reactor comprises a flue gas inlet 1 at its bottom and an outlet 2 at its top. A dry sorbent injection system 3 is arranged between the flue gas inlet 1 and the outlet 2. The dry sorbent injection system 3 is depicted in FIG. 2 in more detail.

[0039] Below the dry sorbent injection system 3 a plurality of water injection nozzles 5 are arranged. The water injection nozzles 5 are directed upwards towards the dry sorbent injection system 3.

[0040] As can be seen from FIG. 2 the dry sorbent injection system 3 comprises a central supply line 7 which leads into the reactor and which is connected to four dry sorbent outlets 4. The dry sorbent outlets 4 are arranged offset to and directed to a wall 6 of the reactor. The dry sorbent outlets 4 have each a lower discharge edge 8, wherein it is shown with respect to two lower discharge edges 8 that the lower discharge edges 8 extend back and forth in a zig zag shaped manner.

[0041] It can also be seen from FIG. 2 that the water injection nozzles 5 are horizontally offset to the dry sorbent outlets 4.

[0042] In use the flue gas advances from the flue gas inlet 1 through the reactor upwards towards the outlet 2. The water injection nozzles 5 spray water droplets into the flue gas, wherein the water droplets advance together with the flue gas to the dry sorbent outlets 4.

[0043] Dry sorbent is advanced through the central supply line 7 to the dry sorbent outlets 4 so that dry sorbent is injected over the lower discharge edges 8 of the dry sorbent outlets 4 into the reactor, whereas the injected dry sorbent comes directly into contact with the flue gas and with the water droplets provided by the water injection nozzles 5. As the flue gas, the water and the dry sorbent come into contact with each other as early as possible and evenly distributed over the cross section of the reactor the sorption process is highly efficient.

[0044] Due to the highly efficient sorption process it is not mandatory to provide a so called fluidized bed above the dry sorbent injection system 3. Accordingly, the maximum flow cross section area 10 above the dry sorbent injection system 3 is only slightly larger than the minimum flow cross section area 9 formed at the exactly one flow channel in which the dry sorbent injection system 3 injects the dry sorbent.

LIST OF REFERENCE NUMBER

[0045] 1 flue gas inlet [0046] 2 outlet [0047] 3 dry sorbent injection system [0048] 4 dry sorbent outlet [0049] 5 water injection nozzle [0050] 6 wall [0051] 7 central supply line [0052] 8 discharge edge [0053] 9 minimum flow cross section area [0054] 10 maximum flow cross section area