Flue gas desulfurization system

Abstract

The utility model relates to the technical field of flue gas treatment equipment, in particular to a flue gas desulfurization system which comprises a desulfurization tower, a process water tank and a slurry pump connected with the desulfurization tower, a demister and a flushing pipe for flushing the demister are arranged on the desulfurization tower; the process water tank is connected with the slurry pump through a cooling water supply pipe and connected with the flushing pipe through a flushing water supply pipe; the flushing water supply pipe is connected with a cooling water supply pipe through a connecting pipe and is connected with a process water tank through a water return pipe; valves for controlling the water flow direction are arranged on the flushing water supply pipe, the connecting pipe and the water return pipe; by arranging the connecting pipe and the water return pipe, when the cooling water pump breaks down, the connecting pipe introduces water in the flushing water supply pipe into the cooling water supply pipe to provide cooling water for the slurry pump, and the problem that normal use of the desulfurization system is affected due to the fact that the slurry pump cannot operate is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas treatment equipment technical field, specifically a flue gas desulfurization system. BACKGROUND

[0002] The flue gas of coal-fired power plant needs to be treated by flue gas desulfurization system, the flue gas desulfurization system includes desulfurization tower, process water tank and the slurry pump connected with desulfurization tower, the process water tank provides cooling water for slurry pump through cooling water supply pipe, and cooling water pump is arranged on cooling water supply pipe, when cooling water pump fails, slurry pump cannot run, thereby the normal use of desulfurization system is affected, and great economic loss is caused. SUMMARY

[0003] The utility model discloses a kind of flue gas desulfurization systems, to solve the problem that when the cooling water pump in the above prior art fails, slurry pump cannot run, thereby the normal use of desulfurization system is affected.

[0004] To achieve the above object, the utility model provides a kind of flue gas desulfurization system, including desulfurization tower, process water tank and with desulfurization tower connection slurry pump;Desulfurization tower is provided with demister and is used to flush the flush pipe of demister;Process water tank is connected slurry pump through cooling water supply pipe, and is connected flush pipe through flush supply pipe;Flush supply pipe is connected with cooling water supply pipe through liaison pipe, and is connected with process water tank through backwater pipe;Flush supply pipe, liaison pipe and backwater pipe are all equipped with the valve of control water flow direction.

[0005] Further, cooling water supply pipe is connected with cooling water pump, and flush supply pipe is equipped with flush water pump.

[0006] Further, slurry pump includes slurry supply pump, circulating pump, and slurry outlet pump;Slurry supply pump is connected with desulfurization tower through slurry supply pipe, circulating pump is connected with desulfurization tower through circulation pipe, and slurry outlet pump is connected with desulfurization tower through slurry outlet pipe.

[0007] Further, mechanical seal installation cavity is arranged in slurry pump, cooling liquid inlet and cooling liquid outlet are arranged on mechanical seal installation cavity;Cooling water supply pipe is connected with cooling liquid inlet.

[0008] The utility model is through the setting liaison pipe and backwater pipe, when cooling water pump fails, liaison pipe introduces the water in flush supply pipe to cooling water supply pipe to provide cooling water for slurry pump, avoids the problem that slurry pump cannot run and affects the normal use of desulfurization system;Because the flow of water in flush supply pipe is greater than the flow of water in cooling water supply pipe, the water that flush supply pipe does not use is returned to process water tank through backwater pipe, prevents the pressure in pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0009] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0010] Fig. 1 This is a schematic diagram of the flue gas desulfurization system in the embodiment;

[0011] Fig. 2 This is a schematic diagram of the structure of the mechanical seal mounting cavity in the embodiment;

[0012] In the diagram: 1. Desulfurization tower; 101. Demister; 102. Flushing pipe; 2. Process water tank; 3. Cooling water supply pipe; 4. Flushing water supply pipe; 5. Connecting pipe; 6. Return water pipe; 7. Valve; 8. Cooling water pump; 9. Flushing water pump; 10. Slurry supply pump; 11. Circulation pump; 12. Slurry discharge pump; 13. Mechanical seal mounting cavity; 1301. Coolant inlet; 1302. Coolant outlet. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0014] like Figs. 1-2 As shown, according to an embodiment of the present invention, a flue gas desulfurization system is provided, including a desulfurization tower 1, a process water tank 2, and a slurry pump connected to the desulfurization tower 1; the desulfurization tower 1 is equipped with a demister 101 and a flushing pipe 102 for flushing the demister 101; the process water tank 2 is connected to the slurry pump through a cooling water supply pipe 3, and is connected to the flushing pipe 102 through a flushing water supply pipe 4; the flushing water supply pipe 4 is connected to the cooling water supply pipe 3 through a connecting pipe 5, and is connected to the process water tank 2 through a return water pipe 6; valves 7 for controlling the water flow direction are provided on the flushing water supply pipe 4, the connecting pipe 5, and the return water pipe 6; the water flow direction in the flushing water supply pipe 4 is from front to back, and the valves 7 on the flushing water supply pipe 4 are located behind the connection between the flushing water supply pipe 4 and the connecting pipe 5 and the return water pipe 6.

[0015] A cooling water pump 8 is connected to the cooling water supply pipe 3, and a flushing water pump 9 is provided on the flushing water supply pipe 4; an isolation valve for isolating the cooling water pump 8 is provided on the cooling water supply pipe 3 near the inlet and outlet of the cooling water pump 8; the flushing water pump 9 is located in front of the connection between the flushing water supply pipe 4 and the connecting pipe 5 and the return water pipe 6.

[0016] The slurry pump includes a slurry supply pump 10, a circulation pump 11, and a slurry discharge pump 12. The slurry supply pump 10 is connected to the desulfurization tower 1 through a slurry supply pipe, the circulation pump 11 is connected to the desulfurization tower 1 through a circulation pipe, and the slurry discharge pump 12 is connected to the desulfurization tower 1 through a slurry discharge pipe.

[0017] The slurry pump 10, the circulating pump 11 and the slurry outlet pump 12 are provided with mechanical seal installation cavities 13, the mechanical seal installation cavities 13 are provided with cooling liquid inlets 1301 and cooling liquid outlets 1302; the cooling water supply pipe 3 is connected with the cooling liquid inlets 1301.

[0018] The embodiment sets the communication pipe 5 and the backwater pipe 6, when the cooling water pump 8 fails, the communication pipe 5 introduces the water in the flushing water supply pipe 4 into the cooling water supply pipe 3 to provide cooling water for the slurry pump, which avoids the problem that the slurry pump cannot run and influences the normal use of the desulfurization system; because the flow of the water in the flushing water supply pipe 4 is greater than the flow of the water in the cooling water supply pipe 3, the water in the flushing water supply pipe 4 is not used up and returns to the process water tank 2 through the backwater pipe 6, which prevents the pressure in the pipe from being blocked.

[0019] The above only describes the preferred embodiments of the present application and is not used to limit the present application, for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flue gas desulfurization system comprising a desulfurization tower (1), a process water tank (2), and a slurry pump connected to the desulfurization tower (1); a mist eliminator (101) is provided on the desulfurization tower (1), and a flushing pipe (102) for flushing the mist eliminator (101) is provided; the process water tank (2) is connected to the slurry pump through a cooling water supply pipe (3), and is connected to the flushing pipe (102) through a flushing supply pipe (4); characterized in that, The flushing water supply pipe (4) is connected to the cooling water supply pipe (3) through the connecting pipe (5) and to the process water tank (2) through the return water pipe (6); the flushing water supply pipe (4), the connecting pipe (5) and the return water pipe (6) are all equipped with valves (7) to control the water flow direction.

2. The flue gas desulfurization system as claimed in claim 1, wherein A cooling water pump (8) is connected to the cooling water supply pipe (3), and a flushing water pump (9) is provided on the flushing water supply pipe (4).

3. The flue gas desulfurization system as claimed in claim 1, wherein The slurry pump includes a slurry supply pump (10), a circulation pump (11), and a slurry discharge pump (12); the slurry supply pump (10) is connected to the desulfurization tower (1) through a slurry supply pipe, the circulation pump (11) is connected to the desulfurization tower (1) through a circulation pipe, and the slurry discharge pump (12) is connected to the desulfurization tower (1) through a slurry discharge pipe.

4. The flue gas desulfurization system as described in claim 1, characterized in that, The slurry pump is provided with a mechanical seal mounting cavity (13), and the mechanical seal mounting cavity (13) is provided with a coolant inlet (1301) and a coolant outlet (1302); the cooling water supply pipe (3) is connected to the coolant inlet (1301).

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