Generator set tail gas treatment system
By adding a wet electrostatic precipitator to the desulfurization absorption tower and using water spraying to flush away ash, the problem of excessive dust concentration and SO3 emissions in the tail gas treatment system of thermal power plants was solved, achieving efficient and economical tail gas purification.
Patent Information
- Application Number
- CN202422956343.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Existing flue gas treatment systems in thermal power plants are unable to meet current stringent environmental protection requirements, especially when the concentration of particulate matter and SO3 emissions exceed the standards. The combined treatment effect of traditional dry dust collectors and desulfurization absorption towers is limited.
A wet electrostatic precipitator is added to the desulfurization absorption tower, and a water spray ash cleaning method is adopted. The combination of the desulfurization absorption tower and the wet electrostatic precipitator is used to treat the exhaust gas. The electrostatic force is used to achieve efficient flue gas purification, reduce flue gas flow resistance and reduce the space occupied by the equipment.
It achieves ultra-low emissions of particulate matter in exhaust gas, reduces SO3 emission concentration, meets environmental protection requirements, and saves on equipment installation and operating costs.
Smart Images
Figure CN223788291U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power plant dust removal technology, and in particular to a generator set exhaust gas treatment system. Background Technology
[0002] Thermal power is one of my country's most important sources of electricity. Although the country is currently accelerating its energy transition, thermal power still occupies an important position in my country's energy structure. A thermal power plant is a factory that uses combustible materials (such as coal) as fuel to produce electricity. Its basic production process is as follows: when fuel is burned, it heats water to generate steam, converting the chemical energy of the fuel into heat energy. The steam pressure drives the turbine to rotate, converting the heat energy into mechanical energy. Then, the turbine drives the generator to rotate, converting the mechanical energy into electrical energy.
[0003] The basic operating mode of thermal power plants dictates that they inevitably generate harmful substances such as dust and sulfur dioxide during the production process. If these pollutants are directly emitted, they will seriously pollute the environment. Therefore, power plants will carry out targeted treatment of exhaust gas before emission. Currently, the common exhaust gas treatment method is to add a dry dust collector at the exhaust gas emission end of the generator unit. Although the dry dust collector has a certain capacity to treat dust in the exhaust gas, with the increasing emphasis on environmental protection by the country in order to reduce environmental pollution and curb ecological degradation, higher requirements have been placed on the energy consumption indicators of coal-fired power units. Exhaust gas treated by dry dust collectors alone can no longer meet the current environmental protection regulations and the energy conservation and emission reduction requirements of coal-fired power units. Utility Model Content
[0004] This application provides a generator set exhaust gas treatment system, which can improve the treatment capacity of power plants and generator set exhaust gas, enabling the exhaust gas emitted by power plant generator sets to meet current environmental protection requirements.
[0005] The above-mentioned objective of this application is achieved through the following technical solution:
[0006] A generator set exhaust gas treatment system includes a desulfurization absorption tower. The air inlet on one side of the lower end of the desulfurization absorption tower is connected to the air outlet of the original dry dust collector of the generator set through a flue pipe. The air outlet of the desulfurization absorption tower is set at its top in a vertical direction.
[0007] A wet electrostatic precipitator is installed directly above the desulfurization absorption tower. The air inlet of the wet electrostatic precipitator is located directly below it and is connected to the air outlet at the top of the desulfurization absorption tower. The air outlet of the wet electrostatic precipitator is located at its top and is connected to a chimney located on one side of the desulfurization absorption tower via a flue pipe.
[0008] Furthermore, the cleaning method for wet electrostatic precipitators is water spraying to flush away ash.
[0009] Furthermore, the spray device for spraying water to remove ash in the wet electrostatic precipitator is connected to the water supply module. The water supply module can transport raw water and recycled water from the power plant to the spray device of the wet electrostatic precipitator when removing dust from the dust collecting anode.
[0010] Furthermore, the water supply module includes a first water pump and a second water pump. The inlet of the first water pump is inserted into the supernatant of the wastewater pool of the desulfurization absorption tower through a water pipe. The inlet of the second water pump is inserted into a water storage tank on one side of the desulfurization absorption tower through a water pipe. The outlet of the first water pump and the outlet pipe of the second water pump are both connected to the spray device in the wet electrostatic precipitator through water pipes.
[0011] Furthermore, a filter is installed on the water pipe connected to the outlet of the first water pump.
[0012] Furthermore, an alkali addition tank is provided on one side of the water storage tank. The alkali addition tank is filled with an alkali solution. A third water pump is connected to one side of the alkali addition tank via a water pipe. The outlet of the third water pump is also connected to the spray device of the wet electrostatic precipitator via a water pipe.
[0013] Furthermore, a mixing water tank is provided on one side of the alkali tank. The outlets of the first water pump, the second water pump, and the third water pump are all connected to the mixing water tank through water pipes. The mixing water tank is connected to the inlet of the fourth water pump through a water pipe. The outlet of the fourth water pump is connected to the spray device of the wet electrostatic precipitator through a water pipe.
[0014] In summary, this application includes at least one of the following beneficial technical effects:
[0015] The exhaust gas discharged from the dry dust collector at the generator set site passes through the desulfurization absorption tower, effectively removing a significant portion of the dust and sulfur trioxide. Since this application places the wet electrostatic precipitator directly above the desulfurization absorption tower, the exhaust gas treated by the tower can efficiently enter the wet electrostatic precipitator. Simultaneously, by reducing the number of bends in the flue pipes, the resistance to flue gas flow is effectively reduced. After the flue gas from the desulfurization absorption tower enters the wet electrostatic precipitator of this application, the wet electrostatic precipitator utilizes electrostatic force to further separate particles from the airflow. As the final dust removal device, the wet electrostatic precipitator plays a crucial role in controlling dust accumulation and also contributes to preventing "gypsum rain" and removing sulfur trioxide. Furthermore, the wet electrostatic precipitator also exhibits high removal efficiency for PM2.5, Hg, and other heavy metals. The exhaust gas treatment system of this application further incorporates a desulfurization absorption tower and a wet electrostatic precipitator on the basis of a traditional dry dust collector to sequentially treat the smoke and dust generated during the operation of the generator set. Through the cooperation of the desulfurization absorption tower and the wet electrostatic precipitator, the SO3 emission concentration can be effectively reduced while achieving ultra-low emission of smoke and dust concentration, so as to ensure that the exhaust gas finally emitted into the atmosphere meets the current environmental protection requirements. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure when the wet electrostatic precipitator of this application is installed directly above the desulfurization absorption tower;
[0018] Figure 2 This is a schematic diagram of the structure when the wet electrostatic precipitator of this application is installed on one side of the desulfurization absorption tower;
[0019] Figure 3 This is a schematic diagram of the spray device of this application inside a wet electrostatic precipitator;
[0020] Figure 4 This is a connection diagram of the water supply module and the sprinkler device of this application (the line segments with arrows between different devices are used to refer to the water pipes that transmit water flow between them, and the direction of the arrows on the line segments is the direction of water flow in the water pipes during use. The filter of this application is set on the upper side of the line segment between the first water pump and the sprinkler device, which means that the filter is installed on the water pipe used for connection between the first water pump and the sprinkler device).
[0021] Figure 5 Is Figure 4Based on the above, a connection diagram of the alkali addition tank and the third water pump has been added;
[0022] Figure 6 Is Figure 5 Based on the above, this application shows the connection diagram after adding a mixing tank and a fourth water pump between the first, second, and third water pumps and the spraying device.
[0023] Attached reference numerals: 1. Desulfurization absorption tower; 2. Wet electrostatic precipitator; 21. Spraying device; 3. Chimney; 4. Water supply module; 41. First water pump; 42. Second water pump; 43. Wastewater pool; 44. Water storage tank; 5. Filter; 6. Alkali addition tank; 7. Third water pump; 8. Mixing water tank; 9. Fourth water pump. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.
[0025] like Figure 1 As shown, this application discloses a generator set exhaust gas treatment system, which includes a desulfurization absorption tower 1. The air inlet on one side of the lower end of the desulfurization absorption tower 1 is connected to the air outlet of the original dry dust collector of the generator set through a flue pipe. The air outlet of the desulfurization absorption tower 1 is set at its top in a vertical direction.
[0026] A wet electrostatic precipitator 2 is installed directly above the desulfurization absorption tower 1. The air inlet of the wet electrostatic precipitator 2 is located directly below it and is connected to the air outlet at the top of the desulfurization absorption tower 1. The air outlet of the wet electrostatic precipitator 2 is located at its top and is connected to the chimney 3 located on one side of the desulfurization absorption tower 1 through a flue pipe.
[0027] In the above embodiments, some existing power plants, due to their long construction time, have outdated exhaust gas treatment systems that no longer meet current environmental requirements as environmental standards have become more stringent. For ease of understanding, a 2×1000MW coal-fired unit is used as an example, with an initial flue gas dust concentration of 30g / m³. 3 After being treated by its existing dry dust collector, the flue gas concentration can be reduced to 85 mg / m³. 3 This value clearly does not meet existing environmental standards.
[0028] Coal-fired power plants use coal as raw material, so the main pollutants in their flue gas are dust, sulfur trioxide, and other nitrogen oxides. Existing desulfurization absorption towers are not only simple and easy to maintain, but also can achieve both dust removal and desulfurization (denitrification) effects by using different dust removal agents. This effect is perfectly applicable to the exhaust gas from generator units. The common method of using desulfurization absorption towers is to circulate and spray a slurry mixed with limestone and gypsum through a circulating pump and spray pipes to absorb sulfur dioxide from the flue gas inside the tower. The flue gas enters from one side of the tower and exits directly from the top outlet. This results in limited contact time between the flue gas and the mixed slurry inside the tower, leaving some dust and sulfur trioxide residues in the discharged flue gas. For example, when a desulfurization absorption tower is connected to the outlet of the dry dust collector at the end of a 2×1000MW coal-fired unit, the tower can further reduce the flue gas concentration to 30mg / m³. 3 The concentration of the flue gas was around 10 mg / m³. Although the concentration was further controlled, it still fell short of the environmental protection requirement of 10 mg / m³. 3 There is a certain gap. Therefore, this application adds a wet electrostatic precipitator 2 (also called a wet electrostatic precipitator in the prior art) at the outlet of the top of the desulfurization absorption tower 1. This precipitator not only has low noise and low dust during operation, but also effectively treats pollutants such as PM2.5 particles, SO3 acid mist, gypsum rain, ammonia aerosol, and heavy metal mercury in the flue gas, reduces the tail feathers of the chimney 3 (the continuously emitted flue gas from the chimney has a feather-like shape and is called a plume or tail feather), and solves the problems of gypsum rain and large white smoke. Its dust removal efficiency is extremely high, reaching more than 90%. However, it is suitable for treating flue gas with low dust concentration. Therefore, this application sets the wet electrostatic precipitator 2 at the process end of the desulfurization absorption tower 1. In this way, the concentration of the flue gas discharged after treatment by the desulfurization absorption tower 1 can meet the application range of the wet electrostatic precipitator. When using the wet electrostatic precipitator to treat flue gas with a dust concentration of 30mg / m³, the concentration of the flue gas can be reduced. 3 After treatment, the concentration of the flue gas can be effectively reduced to 3 mg / m³. 3 This standard clearly meets the requirements for ultra-low emissions of smoke and dust concentration in environmental protection.
[0029] The wet electrostatic precipitator 2 in this application is a vertical tubular electrostatic precipitator. Compared to horizontal plate electrostatic precipitators, while achieving the same dust removal efficiency, the tubular electrostatic precipitator occupies a much smaller area. This reduces the space requirements for on-site construction and renovation, making implementation more convenient. Figure 1 and Figure 2As shown, the wet electrostatic precipitator 2 of this application is located directly above the desulfurization absorption tower 1. Compared with placing the wet electrostatic precipitator 2 on the side of the desulfurization absorption tower 1, it can effectively shorten the path of flue gas flow from the desulfurization absorption tower 1 to the wet electrostatic precipitator 2, and can also reduce the number of bends in the flue gas connecting the desulfurization absorption tower 1 and the wet electrostatic precipitator 2, thereby reducing the resistance of the flue gas flow process.
[0030] In addition, the desulfurization absorption tower 1 has its own internal spraying system during operation. The spraying system adsorbs most of the acidic substances and dust in the flue gas by spraying slurry onto it. This mixed slurry falls to the bottom of the tower, promoting the decomposition of limestone and the generation of by-products. After being treated by a gypsum hydrocyclone, the separated water is discharged into the wastewater pool 43 (also called a recovery water tank), and the separated products are transported to the next stage of separation equipment (this part is all prior art and will not be described in detail here). In this application, the wet electrostatic precipitator 2 is placed directly above the desulfurization absorption tower 1, so that the flushing water discharged from the wet electrostatic precipitator 2 can fall directly into the desulfurization absorption tower 1. Since the dust removal objects of the wet electrostatic precipitator 2 and the desulfurization absorption tower 1 are mainly sulfur oxides and dust, the flushing water discharged from the wet electrostatic precipitator 2 can also be effectively treated together in the desulfurization absorption tower 1. This eliminates the need for a separate flushing water recovery and treatment system for the wet electrostatic precipitator 2, effectively reducing production and operating costs. Therefore, the exhaust gas treatment system of this application not only achieves ultra-low emissions of flue gas dust while effectively reducing SO3 emission concentration based on traditional dry dust collectors through the combination of the desulfurization absorption tower 1 and the wet electrostatic precipitator 2, but also effectively saves installation space and production and operating costs by arranging the wet electrostatic precipitator 2 at the top of the desulfurization absorption tower 1.
[0031] Furthermore, such as Figure 1 and Figure 3 As shown, the cleaning method of the wet electrostatic precipitator 2 is water spraying.
[0032] In the above embodiments, the cleaning methods of the wet electrostatic precipitator 2 mainly include: liquid film flushing cleaning, water cleaning, and self-flushing cleaning. Liquid film flushing cleaning requires continuous spraying of flushing liquid onto the dust collecting electrode plate, and it has high requirements for the structure and surface characteristics of the dust collecting electrode. The surface of the dust collecting electrode needs to use special materials or treatment processes to give it good hydrophilicity so that the liquid film can better adhere and flow. This method has high process requirements and is relatively expensive. Self-flushing cleaning utilizes the flow of flue gas inside the dust collector and the natural fall of liquid to achieve cleaning. This cleaning method has high requirements for the structural design of the dust collector and parameters such as the flow rate and direction of the flue gas, and its cleaning effect has certain limitations. The water spraying cleaning method adopted in this application uses a spray device 21 to spray water onto the dust collecting electrode, utilizing the flushing effect of water to efficiently remove dust. It not only has a relatively simple structure and process but also a good cleaning effect. Therefore, the wet electrostatic precipitator 2 of this application selects water spraying cleaning as its cleaning method.
[0033] Furthermore, such as Figure 3 and Figure 4 As shown, the spray device 21 used for spraying water to wash away dust in the wet electrostatic precipitator 2 is connected to the water supply module 4. The water supply module 4 can transport raw water and recycled water from the power plant to the spray device 21 of the wet electrostatic precipitator 2 when cleaning the dust on the dust collecting anode of the wet electrostatic precipitator 2.
[0034] In the above embodiments, power plants typically have a large amount of recycled water. Utilizing this recycled water to flush the dust collection electrodes of the wet electrostatic precipitator 2 can effectively improve the utilization efficiency of the recycled water. Compared to using only raw water, this achieves better water conservation and reduces the water cost of the equipment. However, the supply of recycled water is not stable. Therefore, the water supply module 4 of this application will simultaneously supply a portion of raw water to the spray device 21 to ensure the stability of the water pressure in the spray device 21 within the wet electrostatic precipitator 2.
[0035] Furthermore, such as Figure 3 and Figure 4 As shown, the water supply module 4 includes a first water pump 41 and a second water pump 42. The inlet of the first water pump 41 is inserted into the supernatant of the wastewater pool 43 of the desulfurization absorption tower 1 through a water pipe. The inlet of the second water pump 42 is inserted into the water storage tank 44 on one side of the desulfurization absorption tower 1 through a water pipe. The outlet of the first water pump 41 and the outlet pipe of the second water pump 42 are both connected to the spray device 21 in the wet electrostatic precipitator 2 through water pipes.
[0036] In the above embodiments, the water pipe connected to the inlet of the first water pump 41 of this application is inserted into the supernatant of the wastewater pool 43 of the desulfurization absorption tower 1. In this way, after the first water pump 41 is started, it can pump away the supernatant of the recovered water located in the upper part of the wastewater pool 43 through the water pipe connected to its inlet, and transport it through the water pipe of the outlet of the first water pump 41 to the main water pipe of the spray device 21 of the wet electrostatic precipitator 2 (generally, the spray device 21 of the wet electrostatic precipitator 2 includes multiple nozzles, branch pipes and main water pipes, and the multiple nozzles are respectively connected to a single main water pipe). (The branch water pipe is connected to the main water pipe). In this way, when the wet electrostatic precipitator is in use, it can obtain cleaning water from the wastewater pool 43 of the desulfurization absorption tower 1 through the first water pump 41. The inlet of the second water pump 42 is connected to the raw water pipe in the plant, and the outlet of the second water pump 42 is connected to the main water pipe in the spray device 21 of the wet electrostatic precipitator 2 through a water pipe. When the amount of usable recycled water in the wastewater pool 43 is insufficient, the second water pump 42 can transport raw water to the spray device 21 to maintain the cleaning effect of the wet electrostatic precipitator. Since the cleaning water after cleaning by the wet electrostatic precipitator falls into the desulfurization absorption tower 1 and is treated together with the mixed slurry at the bottom of the desulfurization absorption tower 1, the resulting recycled water is sent back to the wastewater pool 43 of the desulfurization absorption tower 1. This allows for the recycling of the cleaning water, effectively reducing the water consumption during equipment operation.
[0037] Furthermore, such as Figures 4-6 As shown, a filter 5 is installed on the water pipe connected to the outlet of the first water pump 41.
[0038] In the above embodiments, since the first water pump 41 supplies recycled water to the spray device 21 of the wet electrostatic precipitator 2, although the recycled water has been processed by some equipment in the plant, it will inevitably contain a small amount of impurities. If these impurities are directly sent to the spray device 21 of the wet electrostatic precipitator 2, they may clog the nozzles in the spray device 21. Therefore, this application adds a filter 5 to the water pipe that connects the water pump outlet and the spray device 21 to reduce the risk of clogging of the spray device 21 of the wet electrostatic precipitator 2.
[0039] Furthermore, such as Figure 5 As shown, an alkali addition tank 6 is provided on one side of the water storage tank 44. The alkali addition tank 6 is filled with alkali solution. A third water pump 7 is connected to one side of the alkali addition tank 6 through a water pipe. The outlet of the third water pump 7 is also connected to the spray device 21 of the wet electrostatic precipitator 2 through a water pipe.
[0040] In the above embodiments, sulfur trioxide in the flue gas dissolves to produce acidic water. When this acidic water falls from top to bottom of the desulfurization absorption tower 1, it will cause acid corrosion to some equipment or components it comes into contact with. The alkali addition tank 6 added in this application contains a pre-prepared alkaline solution. The third water pump 7 transports this alkaline solution to the main water pipe of the spray device 21. In this way, when the spray device 21 sprays water to flush the ash, it can neutralize most of the dissolved sulfur trioxide in the flue gas, thereby effectively reducing the acid corrosion of the equipment inside the equipment by the flushing water during the falling process.
[0041] Furthermore, such as Figure 6 As shown, a mixing water tank 8 is provided on one side of the alkali addition tank 6. The outlets of the first water pump 41, the second water pump 42 and the third water pump 7 are all connected to the mixing water tank 8 through water pipes. The mixing water tank 8 is connected to the inlet of the fourth water pump 9 through water pipes. The outlet of the fourth water pump 9 is connected to the spray device 21 of the wet electrostatic precipitator 2 through water pipes.
[0042] In the above embodiments, the outlets of the first water pump 41, the second water pump 42, and the third water pump 7 are all connected to the mixing tank 8. The mixing tank 8 is connected to the spray device 21 of the wet electrostatic precipitator 2 via the fourth water pump 9. In this way, the recycled water pumped by the first water pump 41, the raw water pumped by the second water pump 42, and the alkaline solution pumped by the third water pump 7 are mixed in the mixing tank 8 before entering the spray device 21. This ensures that the liquid flowing into the wet electrostatic precipitator 2 is a homogeneous liquid, thereby improving the neutralization effect of the acidic substances in the rinsing liquid during the rinsing process.
[0043] The implementation principle of this embodiment is as follows: After the exhaust gas discharged from the boiler in the generator set is treated by its original dry dust collector, the flue gas flows into the desulfurization absorption tower 1 connected to the dry dust collector. The desulfurization absorption tower 1 can remove some of the dust and sulfur trioxide and other pollutants from the flue gas. Then, the flue gas discharged from the desulfurization absorption tower 1 flows vertically upward into the wet electrostatic precipitator 2. The electrostatic force in the wet electrostatic precipitator 2 separates the pollutant particles in the flue gas from the airflow, thereby achieving long-distance emission of the unit's exhaust gas concentration. The exhaust gas treatment system of this application not only achieves the effect of ultra-low dust concentration emission based on the traditional dry dust collector by combining the desulfurization absorption tower 1 and the wet electrostatic precipitator 2, but also effectively saves the space required for equipment installation and the cost of production and operation by arranging the wet electrostatic precipitator 2 at the top of the desulfurization absorption tower 1.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A generator set exhaust gas treatment system, characterized in that: It includes a desulfurization absorption tower (1), the air inlet on one side of the lower end of the desulfurization absorption tower (1) is connected to the air outlet of the original dry dust collector of the generator set through a flue pipe, and the air outlet of the desulfurization absorption tower (1) is set at its top in a vertical direction. A wet electrostatic precipitator (2) is provided directly above the desulfurization absorption tower (1). The air inlet of the wet electrostatic precipitator (2) is located directly below it and is connected to the air outlet at the top of the desulfurization absorption tower (1). The air outlet of the wet electrostatic precipitator (2) is located at its top and is connected to the chimney (3) located on one side of the desulfurization absorption tower (1) through a flue.
2. The generator set exhaust gas treatment system according to claim 1, characterized in that: The wet electrostatic precipitator (2) is cleaned by spraying water to remove ash.
3. The generator set exhaust gas treatment system according to claim 2, characterized in that: The spray device (21) for spraying water to remove ash in the wet electrostatic precipitator (2) is connected to the water supply module (4). The water supply module (4) can transport raw water and recycled water from the power plant to the spray device (21) of the wet electrostatic precipitator (2) when removing dust from the dust collecting anode of the wet electrostatic precipitator (2).
4. The generator set exhaust gas treatment system according to claim 3, characterized in that: The water supply module (4) includes a first water pump (41) and a second water pump (42). The inlet of the first water pump (41) is inserted into the supernatant of the wastewater pool (43) of the desulfurization absorption tower (1) through a water pipe. The inlet of the second water pump (42) is inserted into the water storage tank (44) on one side of the desulfurization absorption tower (1) through a water pipe. The outlet of the first water pump (41) and the outlet pipe of the second water pump (42) are both connected to the spray device (21) in the wet electrostatic precipitator (2) through water pipes.
5. The generator set exhaust gas treatment system according to claim 4, characterized in that: A filter (5) is installed on the water pipe connected to the outlet of the first water pump (41).
6. The generator set exhaust gas treatment system according to claim 4 or 5, characterized in that: An alkali addition tank (6) is provided on one side of the water storage tank (44). The alkali addition tank (6) is filled with an alkali solution. A third water pump (7) is connected to one side of the alkali addition tank (6) through a water pipe. The outlet of the third water pump (7) is also connected to the spray device (21) of the wet electrostatic precipitator (2) through a water pipe.
7. The generator set exhaust gas treatment system according to claim 6, characterized in that: A mixing water tank (8) is provided on one side of the alkali tank. The outlets of the first water pump (41), the second water pump (42) and the third water pump (7) are all connected to the mixing water tank (8) through water pipes. The mixing water tank (8) is connected to the inlet of the fourth water pump (9) through water pipes. The outlet of the fourth water pump (9) is connected to the spray device (21) of the wet electrostatic precipitator (2) through water pipes.