Energy-saving and consumption-reducing system for dehumidification liquid of wet tower

Abstract

The utility model relates to the technical field of flue gas treatment equipment, in particular to a wet tower dehumidification liquid energy-saving and consumption-reducing system, which consists of four groups of purification structures, each group of purification structure comprises a wet washing tower, a dehumidification liquid discharge end of the wet washing tower is communicated with a dehumidification water tank through a dehumidification liquid discharge pipeline, and the dehumidification liquid discharge pipeline is communicated with a dehumidification water tank. The liquid discharging end of the dehumidification water tank communicates with a dehumidification liquid circulating pump through a pipeline, the liquid conveying end of the dehumidification liquid circulating pump communicates with a dehumidification liquid main pipe through a dehumidification liquid conveying pipeline, and the dehumidification liquid main pipe communicates with the dehumidification liquid conveying pipelines of the other three purification structures. When the dehumidification liquid circulation system is in operation, the dehumidification liquid of the four sets of purification devices can be used in a backflow mode only through one set of dehumidification liquid circulation pumps, and therefore the other three sets of dehumidification liquid circulation pumps do not need to be operated. Therefore, the number of the dehumidifying liquid circulating pumps can be reduced, and the purposes of energy conservation and emission reduction can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment equipment, in particular to a wet tower dehumidification liquid energy-saving and consumption-reducing system. Background Art

[0002] Waste incineration is a common waste disposal method that converts waste into ash, flue gas, and heat energy through high-temperature incineration. In existing waste treatment plants, waste is mostly incinerated in a centralized manner through waste incinerators. However, when incinerating waste, waste incinerators produce a large amount of flue gas. This flue gas contains various components released when incinerating waste, including harmful substances and pollutants. Therefore, the flue gas needs to be purified. Existing flue gas is mostly treated through a combined process of "SNCR denitrification + rotary spray semi-dry deacidification + dry deacidification (slaked lime injection) + activated carbon injection adsorption + bag filter + GGH1 (primary flue gas heat exchanger) + wet scrubber deacidification (NaOH solution) + GGH2 (secondary flue gas heat exchanger) + SGH (steam heater) + SCR denitrification". The flue gas is then discharged into the chimney through the induced draft fan and discharged into the atmosphere.

[0003] Each incineration boiler in the project is equipped with a flue gas purification device, a total of 4 sets, of which the flue gas purification device will be equipped with a wet scrubber system, a total of 4 sets, and the existing spray tower flue gas purification is as shown in the attached manual. Figure 1 and 2 As shown, each wet scrubber system is equipped with two dehumidification liquid circulation pumps, of which the dehumidification liquid circulation pump is the main energy-consuming equipment in the wet scrubber system. It consumes a lot of electricity during operation. Therefore, how to reduce the number of dehumidification liquid circulation pumps to achieve energy conservation and emission reduction has become an urgent problem that existing personnel need to solve.

[0004] In summary, it is necessary to invent a wet tower dehumidification liquid energy-saving and consumption-reducing system. Utility Model Content

[0005] To this end, the utility model provides a wet tower dehumidification liquid energy-saving and consumption-reduction system to solve the problem that the dehumidification liquid circulation pump is the main energy-consuming equipment in the wet washing tower system, which consumes a large amount of electricity during operation. Therefore, how to reduce the number of dehumidification liquid circulation pumps to achieve energy conservation and emission reduction is an urgent problem that existing personnel need to solve.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a wet tower dehumidification liquid energy-saving and consumption-reducing system, which is composed of four groups of purification structures, each group of the purification structures includes a wet washing tower, the dehumidification liquid discharge end of the wet washing tower is connected to a dehumidification water tank through a dehumidification liquid discharge pipe, the discharge end of the dehumidification water tank is connected to a dehumidification liquid circulation pump through a pipe, the infusion end of the dehumidification liquid circulation pump is connected to a dehumidification liquid main pipe through a dehumidification liquid delivery pipe, the dehumidification liquid main pipe is connected to the dehumidification liquid delivery pipes of the other three groups of purification structures, the wet washing tower is connected to a dehumidification liquid return main pipe through a dehumidification liquid discharge branch pipe, the dehumidification liquid return main pipe is connected to the dehumidification liquid discharge branch pipes of the other three groups of purification structures, and the dehumidification liquid discharge branch pipe is connected to the dehumidification liquid discharge pipe.

[0007] Preferably, a cooling liquid portion is provided at the bottom of the inner wall of the wet scrubbing tower, a flue gas inlet is provided on one side of the wet scrubbing tower and above the cooling liquid portion, and the bottom end of the cooling liquid portion is connected to a cooling liquid circulation pump through a cooling liquid discharge pipe.

[0008] Preferably, a coolant nozzle is provided on the inner wall of the wet scrubbing tower and above the flue gas inlet, and the discharge end of the coolant circulation pump is connected to the coolant nozzle through a coolant delivery pipe.

[0009] Preferably, the top of the inner wall of the wet scrubbing tower is connected to a flue gas exhaust pipe, and a dehumidifying liquid spray pipe is provided on the inner wall of the wet scrubbing tower and below the flue gas exhaust pipe.

[0010] Preferably, the dehumidifying liquid delivery pipeline is connected to a dehumidifying liquid plate exchanger through a dehumidifying liquid delivery branch pipe, the water outlet of the dehumidifying liquid plate exchanger is connected to a dehumidifying liquid nozzle through a dehumidifying liquid input pipe, and the dehumidifying liquid discharge pipeline is arranged below the dehumidifying liquid nozzle.

[0011] Preferably, the dehumidifying liquid input pipe is connected to a dehumidifying liquid PH buffer tank through a dehumidifying liquid input branch pipe on the side close to the dehumidifying liquid plate exchanger, and the bottom discharge end of the dehumidifying liquid PH buffer tank is connected to the top liquid return port of the dehumidifying water tank through a dehumidifying liquid return pipe.

[0012] Preferably, the coolant delivery pipe is connected to a coolant PH buffer tank away from the coolant circulation pump through a coolant delivery branch pipe, and the discharge end of the coolant PH buffer tank is connected to the reflux port of the coolant part through a coolant reflux pipe.

[0013] The beneficial effects of the utility model are:

[0014] In the present invention, while retaining the original dehumidification liquid pipeline, before the dehumidification liquid plate of each furnace is replaced with an inlet, a branch pipe is led out to the dehumidification liquid main pipe, and a branch pipe is led out from the dehumidification discharge pipe of each wet washing tower to the dehumidification liquid return main pipe so that the dehumidification liquid can be refluxed. In this way, only one group of dehumidification liquid circulation pumps is needed to transport the dehumidification liquid to the dehumidification liquid main pipe, and the dehumidification liquid main pipe will transport the dehumidification liquid to the other three groups of wet washing towers for use. The dehumidification liquid discharged from the other three groups of wet washing towers will then flow back to the dehumidification water tank of one group through the dehumidification liquid return main pipe, so that the reflux of the dehumidification liquid of four groups of purification devices can be completed by only one group of dehumidification liquid circulation pumps, so that the dehumidification liquid circulation pumps of the other three groups do not need to be run, thereby reducing the number of dehumidification liquid circulation pumps to achieve the purpose of energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall system structure of the existing flue gas purification device of the present invention;

[0016] Figure 2 This is a schematic diagram of the system structure of a single wet scrubber system currently used in the present invention;

[0017] Figure 3 This is a schematic diagram of the overall system structure of the improved flue gas purification device of the present invention;

[0018] Figure 4 This is a schematic diagram of the system structure of a single wet scrubber system improved by the present invention.

[0019] In the figure: 100, wet scrubber; 200, dehumidification water tank; 300, dehumidification liquid circulation pump; 400, dehumidification liquid return main pipe; 500, dehumidification liquid plate changer; 600, dehumidification liquid pH buffer tank; 700, dehumidification liquid main pipe. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0021] Refer to the attached Figure 2-4The wet tower dehumidification liquid energy-saving and consumption-reducing system provided by the present invention comprises four groups of purification structures, each group of purification structures comprises a wet scrubber 100, a cooling liquid portion is provided at the bottom of the inner wall of the wet scrubber 100, a flue gas inlet is provided on one side of the wet scrubber 100 and above the cooling liquid portion, the flue gas generated by incineration will enter the wet scrubber 100 through the flue gas inlet, and the flue gas can enter the cooling liquid portion through the flue gas inlet, then flow into the dehumidification liquid portion through the cooling liquid portion, and finally be discharged through the flue gas exhaust pipe, the bottom end of the cooling liquid portion is connected to a cooling liquid circulation pump through the cooling liquid exhaust pipe, the inner wall of the wet scrubber 100 and above the flue gas inlet are provided with a cooling liquid nozzle, the discharge end of the cooling liquid circulation pump is connected to the cooling liquid nozzle through a cooling liquid delivery pipe, the discharged cooling liquid can be returned to the cooling liquid nozzle by the cooling liquid circulation pump, so that the cooling liquid nozzle can spray the cooling liquid to cool the flue gas;

[0022] The dehumidifying liquid discharge end of the wet scrubber 100 is connected to the dehumidifying water tank 200 through a dehumidifying liquid discharge pipe. The discharge end of the dehumidifying water tank 200 is connected to the dehumidifying liquid circulation pump 300 through a pipe. The dehumidifying liquid circulation pump 300 is provided to discharge the dehumidifying liquid stored in the wet scrubber 100. The infusion end of the dehumidifying liquid circulation pump 300 is connected to the dehumidifying liquid main pipe 700 through a dehumidifying liquid delivery pipe. The dehumidifying liquid main pipe 700 is connected to the dehumidifying liquid delivery pipes of the other three groups of purification structures. The dehumidifying liquid main pipe 700 is provided to deliver the dehumidifying liquid to other wet scrubber systems for supply. The wet scrubber 100 is used. The wet scrubber 100 is connected to the dehumidifying liquid return pipe 400 through the dehumidifying liquid discharge branch pipe. The dehumidifying liquid return pipe 400 is connected to the dehumidifying liquid discharge branch pipes of the other three groups of purification structures. The dehumidifying liquid return pipe 400 is set to collect the dehumidifying liquid discharged from other wet scrubbers 100 and return it to one of the dehumidifying water tanks, so that the dehumidifying liquid circulation pump 300 in the system can re-transport the discharged dehumidifying liquid back to the dehumidifying liquid main pipe 700 for use. The top of the inner wall of the wet scrubber 100 is connected to A dehumidifying liquid nozzle is provided on the inner wall of the flue gas exhaust pipe and below the wet scrubber 100. The dehumidifying liquid delivery pipe is connected to the dehumidifying liquid plate changer 500 through a dehumidifying liquid delivery branch pipe. The water outlet of the dehumidifying liquid plate changer 500 is connected to the dehumidifying liquid nozzle through a dehumidifying liquid input pipe. The dehumidifying liquid plate changer 500 is provided to reduce the temperature of the dehumidifying liquid to be used by heat exchange. The dehumidifying liquid discharge pipe is provided below the dehumidifying liquid nozzle. The dehumidifying liquid input pipe is connected to the dehumidifying liquid pH buffer tank 600 through a dehumidifying liquid input branch pipe on the side close to the dehumidifying liquid plate changer 500. The dehumidifying liquid PH buffer tank 600 can adjust the pH value of the dehumidifying liquid through NaOH solution. The bottom discharge end of the dehumidifying liquid PH buffer tank 600 is connected to the top return port of the dehumidifying water tank 200 through the dehumidifying liquid reflux pipe. The cooling liquid delivery pipe is connected to the cooling liquid PH buffer tank through the cooling liquid delivery branch pipe away from the cooling liquid circulation pump. The discharge end of the cooling liquid PH buffer tank is connected to the reflux port of the cooling liquid part through the cooling liquid reflux pipe. The cooling liquid PH buffer tank can adjust the pH value of the circulating coolant, and the adjustment can be performed through NaOH solution.

[0023] The use process of the present invention is as follows: the flue gas generated by boiler incineration undergoes semi-dry deacidification, dry deacidification, and bag dust removal, and is then heat exchanged into flue gas at about 90°C by GGH1. The flue gas enters the upper part of the coolant portion in the wet scrubber 100 from the flue gas inlet below the wet scrubber 100, and the provided coolant circulation pump will transport the coolant to the coolant nozzle and spray it out from the coolant nozzle to cool and purify the flue gas first, and then the flue gas flows upward into the dehumidifying liquid portion, and the provided dehumidifying liquid circulation pump 300 can absorb the dehumidifying liquid in the dehumidifying water tank 200, and then transport it to the dehumidifying liquid plate exchanger 500 through the dehumidifying liquid delivery pipeline for heat exchange and cooling. The cooled dehumidifying liquid will be sprayed out through the dehumidifying liquid nozzle to purify the flue gas, and the purified flue gas will eventually flow out of the wet scrubber 100 through the flue gas exhaust pipe;

[0024] At the same time, the dehumidifying liquid circulation pump 300 in one of the wet scrubber systems can transport the dehumidifying liquid to the dehumidifying liquid main pipe 700, and the dehumidifying liquid main pipe 700 will transport the dehumidifying liquid to other wet scrubber systems. The other wet scrubber systems will return the dehumidifying liquid to the corresponding dehumidifying liquid plate exchanger 500 through the dehumidifying liquid main pipe 700, and after heat exchange and cooling in the dehumidifying liquid plate exchanger 500, it will be transported to the corresponding wet scrubber 100 for use. The other three groups of wet scrubbers 100 can spray the dehumidifying liquid. The dehumidified liquid flows back to the dehumidified liquid return main pipe 400 through the dehumidified liquid discharge pipe, and the corresponding dehumidified liquid circulation pump flows back to the dehumidified water tank 200 through the dehumidified liquid discharge pipe and the dehumidified liquid discharge branch pipe. The dehumidified liquid is then transported to the dehumidified liquid main pipe 700 by the dehumidified liquid circulation pump 300. In this way, the flow and transportation of the entire dehumidified liquid can be completed by starting only one group of dehumidified liquid circulation pumps 300, thereby reducing power consumption. At the same time, the dehumidified liquid circulation pumps 300 in other groups of wet scrubber systems can also be started normally when needed.

[0025] In the present invention, corresponding valves are provided at the connection positions of the entire system pipelines, so that the flow of the dehumidifying liquid and the cooling liquid can be controlled.

[0026] The above description is merely a preferred embodiment of the present invention. Anyone skilled in the art may utilize the above-described technical solutions to modify the present invention or create equivalent technical solutions. Therefore, any simple modification or equivalent replacement based on the technical solutions of the present invention falls within the scope of protection claimed by the present invention.

Claims

1. Wet tower dehumidification liquid energy saving and consumption reduction system, which consists of four groups of purification structures, characterized by: Each group of purification structures comprises a wet scrubber (100), wherein the dehumidifying liquid discharge end of the wet scrubber (100) is connected to a dehumidifying water tank (200) via a dehumidifying liquid discharge pipe, the discharge end of the dehumidifying water tank (200) is connected to a dehumidifying liquid circulation pump (300) via a pipe, the infusion end of the dehumidifying liquid circulation pump (300) is connected to a dehumidifying liquid main pipe (700) via a dehumidifying liquid delivery pipe, the dehumidifying liquid main pipe (700) is connected to the dehumidifying liquid delivery pipes of the other three groups of purification structures, the wet scrubber (100) is connected to a dehumidifying liquid return main pipe (400) via a dehumidifying liquid discharge branch pipe, the dehumidifying liquid return main pipe (400) is connected to the dehumidifying liquid discharge branch pipes of the other three groups of purification structures, and the dehumidifying liquid discharge branch pipe is connected to the dehumidifying liquid discharge pipe.

2. The wet tower dehumidification liquid energy saving and consumption reduction system according to claim 1, characterized in that: A cooling liquid portion is provided at the bottom of the inner wall of the wet scrubber (100), a flue gas inlet is provided on one side of the wet scrubber (100) and above the cooling liquid portion, and the bottom end of the cooling liquid portion is connected to a cooling liquid circulation pump through a cooling liquid discharge pipe.

3. The wet tower dehumidification liquid energy saving and consumption reduction system according to claim 2, characterized in that: A coolant nozzle is provided on the inner wall of the wet scrubbing tower (100) and above the flue gas inlet, and the discharge end of the coolant circulation pump is connected to the coolant nozzle via a coolant delivery pipe.

4. The wet tower dehumidification liquid energy saving and consumption reduction system according to claim 1 is characterized in that: The top of the inner wall of the wet scrubber (100) is connected to a flue gas exhaust pipe, and a dehumidifying liquid spray pipe is provided on the inner wall of the wet scrubber (100) below the flue gas exhaust pipe.

5. The wet tower dehumidification liquid energy-saving and consumption-reducing system according to claim 4, characterized in that: The dehumidifying liquid delivery pipeline is connected to a dehumidifying liquid plate exchanger (500) through a dehumidifying liquid delivery branch pipe, the water outlet end of the dehumidifying liquid plate exchanger (500) is connected to a dehumidifying liquid nozzle through a dehumidifying liquid input pipe, and the dehumidifying liquid discharge pipeline is arranged below the dehumidifying liquid nozzle.

6. The wet tower dehumidification liquid energy saving and consumption reduction system according to claim 5, characterized in that: The dehumidifying liquid input pipe and the side close to the dehumidifying liquid plate exchanger (500) are connected to the dehumidifying liquid pH buffer tank (600) through a dehumidifying liquid input branch pipe, and the bottom discharge end of the dehumidifying liquid pH buffer tank (600) is connected to the top liquid return port of the dehumidifying water tank (200) through a dehumidifying liquid return pipe.

7. The wet tower dehumidification liquid energy saving and consumption reduction system according to claim 3 is characterized in that: The coolant delivery pipe is connected to a coolant PH buffer tank away from the coolant circulation pump through a coolant delivery branch pipe, and the discharge end of the coolant PH buffer tank is connected to the reflux port of the coolant part through a coolant reflux pipe.

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