Water washing energy-saving device for controlling ammonia escape

Abstract

The utility model discloses a washing energy-saving device for controlling ammonia escape, which comprises a washing device and a water tank positioned outside the washing device, the upper part and the lower part of the washing device are respectively provided with a discharge port and a gas inlet, and a demister, a washing sprayer, a baffle plate and a liquid collecting pool are sequentially arranged between the discharge port and the gas inlet in the washing device from top to bottom; the liquid collecting pool is installed in the middle of the washing device in a suspended mode, a supporting piece is fixedly connected between the circumferential direction of the liquid collecting pool and the wall face of the washing device, the outer side of the baffle plate is fixedly connected to the wall face of the washing device, the inner side of the baffle plate is located above the edge of the liquid collecting pool, and a gap is formed between the baffle plate and the liquid collecting pool. One end of the circulating pipeline is connected to the bottom of the liquid collecting pool, the other end is connected with the washing sprayer, and a communicating pipe is connected between the circulating pipeline and the water tank. According to the utility model, impurities such as ammonia in the flue gas are absorbed in a multi-density manner through washing liquid for multiple times, so that the ammonia escape is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to environmental protection ultra -low emission technical field, specifically relates to a kind of high efficiency, low energy consumption, low emission's water washing energy-saving device for controlling ammonia escape. BACKGROUND

[0002] With the increasingly prominent environmental and climate problems caused by SO2 and other waste gas factors emissions, ammonia desulfurization is applied more and more widely, but the ammonia escape, aerosol and other problems caused by flue gas tailing phenomenon have caused more and more attention. Therefore, how to solve the problem of flue gas tailing, realize the upgrading of pollution control, reduce secondary pollution and environmental accidents is the problem to be solved for ammonia desulfurization system. CONTENT OF UTILITY MODEL

[0003] The utility model aims at providing a kind of water washing energy-saving device for controlling ammonia escape, to solve the flue gas tailing phenomenon caused by ammonia escape and aerosol in the ammonia desulfurization of prior art, realize the removal of ammonia escape and reduce system energy consumption.

[0004] The utility model adopts the following technical scheme: a kind of water washing energy-saving device for controlling ammonia escape, it includes water washing device and water tank located in the outside of water washing device, the upper and lower of water washing device are respectively provided with discharge port and gas inlet, water washing device is located between discharge port and gas inlet from top to bottom in it and is sequentially provided with demister, water washing sprayer, baffle and liquid collecting tank, liquid collecting tank is suspendedly installed in the middle part of water washing device, support is fixedly connected between the circumferential direction of liquid collecting tank and the wall surface of water washing device, the outer side of baffle is fixedly connected on the wall surface of water washing device, the inner side of baffle is located above the edge of liquid collecting tank, and there is gap between baffle and liquid collecting tank, the outside of water washing device is equipped with circulating pipeline, and water washing liquid circulating pump is arranged on circulating pipeline, one end of circulating pipeline is connected at the bottom of liquid collecting tank, and the other end is connected with water washing sprayer, and the connecting pipe is connected between circulating pipeline and water tank.

[0005] The supplement liquid pipe for supplementing water to water washing sprayer is connected on the circulating pipeline, and the supplement liquid pipe is located behind water washing liquid circulating pump along the liquid flow direction in circulating pipeline, and the connecting pipe is located before water washing liquid circulating pump.

[0006] Liquid level control valve is arranged on the supplement liquid pipe, first liquid level meter is arranged on the circulating pipeline between the connecting pipe and water washing circulating pump, second liquid level meter is arranged on the water tank, and first liquid level meter and second liquid level meter are connected with liquid level control valve by signal.

[0007] The liquid collecting tank adopts the bowl-shaped structure with large opening and small bottom surface.

[0008] The baffle is inclined downward from outside to inside.

[0009] The baffle plate adopts an annular structure which is inclined from outside to inside.

[0010] The communication pipe has an overflow pipe section, and the height of the overflow pipe section is higher than the bottom surface of the sump and lower than the top surface of the sump.

[0011] The upper and lower demisters are respectively provided with demister sprayers, and the water inlets of the two demister sprayers are connected in parallel.

[0012] The water inlets of the upper and lower demister sprayers are respectively provided with electric control valves.

[0013] The demister adopts a plate demister, a wire mesh demister or a packing demister.

[0014] The flue gas discharged by the desulfurization system is washed by the water washing device, the flue gas runs upwards through the gap between the baffle plate and the sump, is sprayed by the water washing sprayer to remove ammonia, and is then discharged upwards through the discharge port; the spraying liquid is collected in the sump, the liquid level is controlled by the circulating pipeline and the water washing circulating pump, a certain liquid level height is maintained, multiple circulation can be performed, the water washing liquid can be used multiple times and multiple densities to absorb the ammonia and other impurities in the flue gas, and the excessive absorption liquid enters the water tank to be used as a supplement.

[0015] The water washing coupling device is connected with the smoke discharge port of the entire desulfurization system, greatly reduces the subsequent NH3 emission, solves the ammonia escape and tailing problems of the entire desulfurization system, the sump is arranged in the water washing device, compared with the existing technology, the water washing and collecting device of the hood is more area-saving, installation and operation are relatively simple, and the liquid level is more easily controlled in combination with the control system, and fine management is realized.

[0016] Preferably, the supplement pipe is communicated with the water tank to realize the recycling of the water washing liquid, or an external water source is communicated with the supplement pipe to discharge the spraying liquid collected in the sump into the water tank, so that the water washing liquid is replaced.

[0017] Preferably, the liquid level meter and the liquid level control valve are arranged, the water supplement amount of the system is controlled according to the liquid level of the system, the system is maintained in a reasonable liquid level range, the water supplement amount is reduced, the circulation efficiency is improved, and the system is controlled in a stable operation range.

[0018] Preferably, the baffle plate is high on the outside and low on the inside, so that the spraying liquid can be collected into the sump as much as possible; the baffle plate adopts an annular structure, so that the spraying liquid is prevented from entering the bottom of the water washing device from the baffle plate.

[0019] Preferably, the communication pipe has an overflow pipe section, and only when the liquid surface of the sump exceeds the overflow pipe section, the liquid in the sump can be discharged into the water tank.

[0020] Preferably, the flue gas is sprayed by the lower water washing sprayer, enters the demisting sprayer, is completely absorbed by the high-density covering and low-concentration absorbing water absorption liquid to absorb ammonia and other impurities, so as to remove a small amount of ammonia entrained in the flue gas and reduce the occurrence of ammonia escape. The utility model realizes the joint control of the whole system by coupling the water washing and demisting spraying devices, reduces the collection equipment, circulating pump and corresponding electrical instrument facilities of the water washing system compared with the existing control system, reduces the operation surface, improves the practicability of the whole system, reduces the energy consumption, realizes the multi-stage absorption and purification utilization of the flue gas, greatly improves the ammonia escape and tailing phenomenon, and realizes the purification, energy saving and ultra-low emission of the whole device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic view of a water washing energy-saving device for controlling ammonia escape according to an embodiment of the utility model.

[0022] In the figure: 1-water washing device, 1.1-discharge port, 2-water tank, 3-demister, 4-water washing sprayer, 5-baffle, 6-liquid collecting tank, 7-circulating pipeline, 8-water washing liquid circulating pump, 9-communication pipe, 9.1-overflow pipe section, 10-liquid supplement pipe, 11-liquid level control valve, 12-first liquid level meter, 13-second liquid level meter, 14-demisting sprayer, 15-electric control valve. DETAILED DESCRIPTION

[0023] The utility model will be described in detail in combination with the drawings and specific embodiments.

[0024] As Figure 1 shown, the water washing energy-saving device for controlling ammonia escape according to the embodiment comprises a water washing device 1 and a water tank 2 located outside the water washing device 1, the water washing device 1 is respectively provided with a discharge port 1.1 and a gas inlet (not shown in the figure) at the top and bottom, the water washing device 1 is sequentially provided with a demister 3, a water washing sprayer 4, a baffle 5 and a liquid collecting tank 6 from top to bottom between the discharge port 1.1 and the gas inlet, the liquid collecting tank 6 is suspendedly installed at the middle part of the water washing device 1, support members are fixedly connected between the circumferential direction of the liquid collecting tank 6 and the wall surface of the water washing device 1, the outer side of the baffle 5 is fixedly connected to the wall surface of the water washing device 1, the inner side of the baffle 1 is located above the edge of the liquid collecting tank 6, and there is a gap between the baffle and the liquid collecting tank, the water washing device 1 is externally provided with a circulating pipeline 7, the circulating pipeline 7 is provided with a water washing liquid circulating pump 8, one end of the circulating pipeline 7 is connected to the bottom of the liquid collecting tank 6, the other end is connected to the water washing sprayer 4, and the circulating pipeline 7 and the water tank 2 are connected by a communication pipe 9. The communication pipe 9 has an overflow pipe section 9.1, the height of the overflow pipe section 9.1 is higher than the bottom surface of the liquid collecting tank 6 and smaller than the top surface of the liquid collecting tank 6.

[0025] The circulating pipeline 7 is connected with a liquid supplementing pipeline 10 for supplementing water to the water washing sprayer 4, and the liquid supplementing pipeline 10 is located after the water washing liquid circulating pump 8 along the liquid flow direction of the circulating pipeline 7, and the communicating pipeline 9 is located before the water washing liquid circulating pump 8.

[0026] The collecting pool 6 adopts a bowl-shaped structure with a large opening and a small bottom surface.

[0027] The baffle plate 5 is inclined downward from the outside to the inside.

[0028] The demisting sprayer 4 is provided with demisting sprayers 14 above and below, respectively, and the water inlets of the two demisting sprayers 14 are connected in parallel.

[0029] In operation, flue gas enters the water washing device 1 through the gas discharged from the concentration and absorption section of the ammonia desulfurization device, enters the discharge port 1.1 through the demisting device 3, and is discharged. The spraying liquid sprayed by the water washing sprayer and the demisting sprayers above and below is collected by the collecting pool 6, and then enters the water washing device through the circulating pipeline 7 under the action of the water washing circulating pump 8, so that the water system circulation is established. When the liquid level in the collecting pool 6 is too high, the water is discharged into the water tank through the communicating pipeline; when the water washing sprayer is short of water, the water is supplemented through the liquid supplementing pipeline 10, and the water amount in the circulating pipeline 7 and the water tank 7 is detected by the first liquid level meter and the second liquid level meter, respectively, to jointly control the opening and closing of the liquid level control valve 11, so that the liquid supplementing of the water system can be automatically controlled. The used water washing liquid is discharged through the communicating pipeline, and the liquid is supplemented to the water washing device through the liquid supplementing pipeline, so that the replacement of the water washing liquid is completed. After the flue gas is washed by the utility model, the residual ammonia and aerosol content in the flue gas is reduced, and the tailing phenomenon of the flue gas caused by ammonia escape and aerosol in the ammonia desulfurization process is obviously improved.

[0030] The utility model discloses a water washing and demisting spraying device, realizes the joint control of the whole system, reduces the collection equipment, circulating pump and corresponding electric instrument facilities of the water washing system compared with the prior control system, reduces the operation surface, improves the practicability of the whole system, and reduces the energy consumption. The water washing energy-saving device of the utility model can greatly reduce the emission of various pollutants of flue gas, and the emission content can be reduced to: SO2 content ≤10 mg / Nm 3 , NH3 content ≤1.5 mg / Nm 3 , particulate matter content ≤3 mg / Nm 3Compared with the prior art device, the energy consumption is reduced by more than 35%.

[0031] The above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A water washing energy saving device for controlling ammonia slip, characterized by: It includes water washing device and water tank outside water washing device, the upper and lower of water washing device are respectively provided with discharge port and gas inlet, water washing device is provided with demister, water washing sprayer, baffle and liquid pool from top to bottom between discharge port and gas inlet, liquid pool is suspendedly installed in the middle of water washing device, support is fixedly connected between liquid pool circumference and water washing device wall surface, the outer side of baffle is fixedly connected on water washing device wall surface, the inner side of baffle is located above the edge of liquid pool, and the baffle has a gap between the liquid pool, the water washing device is provided with circulating pipeline outside, and water washing liquid circulating pump is arranged on the circulating pipeline, one end of the circulating pipeline is connected to the bottom of the liquid pool, and the other end is connected to the water washing sprayer, and the circulating pipeline and the water tank are connected with the communication pipe.

2. The ammonia slip control water wash energy saving device of claim 1, wherein: The circulating pipeline is connected with a liquid supplement pipe for supplementing water to the water washing sprayer, and the liquid supplement pipe is located behind the water washing liquid circulating pump along the liquid flow direction of the circulating pipeline, and the communication pipe is located before the water washing liquid circulating pump.

3. The ammonia slip control water wash energy recovery device of claim 2, wherein: The liquid supplement pipe is provided with a liquid level control valve, the circulating pipeline between the communication pipe and the water washing circulating pump is provided with a first liquid level meter, the water tank is provided with a second liquid level meter, and the first liquid level meter and the second liquid level meter are connected with the liquid level control valve through signals.

4. The ammonia slip control water wash energy saving device of claim 1, wherein: The liquid pool adopts a bowl-shaped structure with a large opening and a small bottom surface.

5. The ammonia slip control water wash energy saving device of claim 1, wherein: The baffle is inclined downward from the outside to the inside.

6. The ammonia slip control water wash energy saving device of claim 5, wherein: The baffle adopts an annular structure inclined from the outside to the inside.

7. The ammonia slip control water wash energy saving device of claim 1, wherein: The communication pipe has an overflow pipe section, and the height of the overflow pipe section is higher than the bottom surface of the liquid pool and smaller than the top surface of the liquid pool.

8. The ammonia slip control water wash energy saving device of claim 1, wherein: The demister is provided with demisting sprayers above and below, and the water inlets of the two demisting sprayers are connected in parallel.

9. The ammonia slip control water wash energy recovery device of claim 8, wherein: The water inlets of the two demisting sprayers are respectively provided with electric control valves.

10. The ammonia slip control water wash energy recovery device of claim 1, wherein: The demister adopts a plate-type demister, a wire mesh demister or a packing demister.

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