Low-low-temperature electric dust remover and smoke dust treatment method

Abstract

The low-low-temperature electric dust remover comprises a cooler, a water supplementing tank and a heating medium water expansion tank, the right side of the cooler communicates with the low-low-temperature electric dust remover through a pipeline, and the top of the low-low-temperature electric dust remover communicates with a desulfurizing tower through a pipeline. The device is provided with the cooler, the low-low-temperature electric dust remover, the water supplementing tank, the heating medium water expansion tank, the flue gas heater, the desulfurization tower, the cathode line, the hollow pipe, the spray head and the anode plate, flue gas enters the cooler from the gas inlet pipe and is conveyed into the low-low-temperature electric dust remover through a pipeline, and in the process, the cathode line and the anode plate remove dust, so that the dust is effectively removed, and the dust removal efficiency is improved. The external water pump is turned on, water can be conveyed into the hollow pipe through the pipeline and discharged from the spray head, dust attached to the surface of the anode plate can be removed, and then flue gas is conveyed to the desulfurization tower through the pipeline, finally conveyed into the flue gas heater through the pipeline and finally discharged from the gas outlet pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of VOCs waste gas treatment, and particularly to a low-low temperature electrostatic precipitator and a soot treatment method. Background Art

[0002] VOCs is an abbreviation for volatile organic compounds, which are a class of organic compounds that are easily volatile at normal temperature. These compounds have a relatively high saturated vapor pressure and a low boiling point, and usually exist in the form of gas under standard conditions. VOCs include a variety of chemical substances, such as alkanes, aromatic hydrocarbons, alkenes, halogenated hydrocarbons, esters, aldehydes, ketones, etc., totaling more than 300 kinds. However, the overall treatment effect of existing VOCs waste gas treatment devices is poor and the energy consumption is large, thus bringing inconvenience to people's use. Summary of the Invention

[0003] The purpose of the present invention is to provide a low-low temperature electrostatic precipitator and a soot treatment method to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A low-low temperature electrostatic precipitator includes a cooler, a makeup water tank and a heat medium water expansion tank. The right side of the cooler is connected to a low-low temperature electrostatic precipitator through a pipeline, and the top of the low-low temperature electrostatic precipitator is connected to a desulfurization tower through a pipeline. The right side of the desulfurization tower is connected to a flue gas heater through a pipeline, and a water pump is fixedly connected to the right side of the makeup water tank. The left side of the heat medium water expansion tank is fixedly connected to a heat medium water circulation pump. The inner cavity of the cooler is connected to a first serpentine tube through a first bracket, and the inner cavity of the flue gas heater is fixedly connected to a second serpentine tube through a second bracket.

[0005] Preferably, an air inlet pipe is connected to the lower end of the left side of the cooler, and an air outlet pipe is connected to the upper end of the right side of the flue gas heater.

[0006] Preferably, both the front and rear sides of the bottom of the cooler are fixedly connected with first support legs, the bottom of the makeup water tank is fixedly connected with a plurality of second support legs evenly distributed at equal intervals, and the periphery of the bottom of the low-low temperature electrostatic precipitator is fixedly connected with third support legs.

[0007] Preferably, the bottom of the desulfurization tower is fixedly connected with a plurality of fourth support legs evenly distributed at equal intervals, the bottom of the heat medium water expansion tank is fixedly connected with a plurality of fifth support legs evenly distributed at equal intervals, and both the front and rear sides of the bottom of the flue gas heater are fixedly connected with sixth support legs.

[0008] Preferably, both the upper and lower ends of the inner surface of the cooler are movably connected with stirring shafts, the outer surface of the stirring shafts is fixedly connected with stirring blades, the two stirring shafts are connected by a single-sided tooth synchronous belt, the upper end of the back of the cooler is fixedly connected with a motor, and the output shaft of the motor is connected to the upper stirring shaft through a single-sided tooth synchronous belt.

[0009] Preferably, a first demineralized water inlet is provided at the top of the makeup water tank, and a first demineralized water outlet is provided at the bottom on the left side of the makeup water tank. Sealing covers are threadedly connected to the ends of both the first demineralized water outlet and the first demineralized water inlet.

[0010] Preferably, a second demineralized water inlet is provided at the top of the hot medium water expansion tank, and a second demineralized water outlet is provided at the bottom on the right side of the hot medium water expansion tank. Sealing covers are threadedly connected to the ends of both the second demineralized water outlet and the second demineralized water inlet.

[0011] Preferably, a cathode wire is fixedly connected to the left end inside the low-low temperature electrostatic precipitator, an anode plate is fixedly connected to the right end inside the low-low temperature electrostatic precipitator, a hollow pipe is fixedly connected to the top inside the low-low temperature electrostatic precipitator, a plurality of nozzles are arranged at equal intervals at the bottom of the hollow pipe, and the hollow pipe is communicated with the output end of an external water pump through a pipeline.

[0012] Preferably, the input end of the water pump is communicated with the bottom of the makeup water tank through a pipeline, the output end of the water pump is communicated with the top of the hot medium water expansion tank through a pipeline, the input end of the hot medium water circulation pump is communicated with the bottom of the hot medium water expansion tank through a pipeline, the output end of the hot medium water circulation pump is communicated with the first serpentine pipe through a pipeline. The number of the first serpentine pipes is two, and the two first serpentine pipes are communicated with each other through a first connecting pipe. The back of the first serpentine pipe is communicated with the second serpentine pipe through a pipeline. The number of the second serpentine pipes is three, and the three second serpentine pipes are communicated with each other through a second connecting pipe. And the end of the second serpentine pipe is communicated with the top of the hot medium water expansion tank through a pipeline.

[0013] A method for treating soot by using a low-low temperature electrostatic precipitator includes the following steps: A. The flue gas enters the cooler from the inlet pipe and is transported to the low-low temperature electrostatic precipitator through a pipeline. During this process, the cathode wire and the anode plate remove dust. By turning on the external water pump, water can be transported into the hollow pipe through the pipeline and discharged from the nozzles, so as to remove the dust adhered to the surface of the anode plate. Then the flue gas is transported to the desulfurization tower through a pipeline, and finally transported to the flue gas heater through a pipeline and finally discharged from the outlet pipe. B. During this process, by turning on the water pump, the hot medium water can be transported into the hot medium water expansion tank. By turning on the hot medium water circulation pump, the hot medium water can be transported into the first serpentine pipe, and with the cooperation of the first connecting pipe, the hot medium water can be transported into the second serpentine pipe, and with the cooperation of the second connecting pipe, the hot medium water is transported into the hot medium water expansion tank. C. By turning on the motor, the stirring shaft can be driven to rotate through the single-sided tooth synchronous belt, and the stirring blades can disturb the air in the cooler, thereby improving the heat exchange effect.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention is provided with a cooler, a low-temperature electrostatic precipitator, a makeup water tank, a heat medium water expansion tank, a flue gas heater, a desulfurization tower, a cathode wire, a hollow tube, a spray head and an anode plate. The flue gas enters the cooler from the inlet pipe and is conveyed to the low-temperature electrostatic precipitator through a pipeline. During this process, the cathode wire and the anode plate remove dust. By turning on the external water pump, water can be conveyed into the hollow tube through a pipeline and discharged from the spray head, so as to remove the dust adhered to the surface of the anode plate. Then the flue gas is conveyed to the desulfurization tower through a pipeline and finally conveyed to the flue gas heater through a pipeline and finally discharged from the outlet pipe. There are provided a heat medium water circulation pump, a water pump, a first serpentine tube, a stirring blade, a first connecting pipe, a stirring shaft, a motor, a second connecting pipe and a second serpentine tube. By turning on the water pump, the heat medium water can be conveyed into the heat medium water expansion tank. By turning on the heat medium water circulation pump, the heat medium water can be conveyed into the first serpentine tube, and with the cooperation of the first connecting pipe, the heat medium water can be conveyed into the second serpentine tube, and with the cooperation of the second connecting pipe, the heat medium water is conveyed into the heat medium water expansion tank. By turning on the motor, the stirring shaft can be driven to rotate through a single-sided tooth synchronous belt, and the stirring blade can disturb the air in the cooler, so as to improve the heat exchange effect. At the same time, the temperature of the flue gas at the inlet of the electrostatic precipitator decreases, the flue gas volume decreases, the specific collection area increases, and the residence time of dust in the electric field increases, thereby improving the dust removal efficiency. The reduction of the actual flue gas volume can reduce the specifications of downstream equipment, reduce the energy consumption of the fan, and save costs. The reduction of the flue gas temperature causes most of the SO3 in the flue gas to condense into sulfuric acid mist in the low-temperature economizer or MGGH, adhere to the dust and be neutralized by alkaline substances, greatly reducing the specific resistance of the dust and avoiding the back corona phenomenon, further improving the dust removal efficiency. When the low-temperature electrostatic precipitator system uses a low-temperature economizer to reduce the flue gas temperature, coal consumption and plant electricity consumption can be saved. For the units with subsequent supporting wet desulfurization systems, the reduction of the flue gas temperature can not only improve the desulfurization efficiency, but also reduce the process water consumption of wet desulfurization and effectively alleviate the problem of gypsum rain. After the heat recovered from the flue gas is transferred to the wet desulfurization system, the temperature of the flue gas discharged from the chimney is increased to achieve the effect of white smoke removal from the flue gas. The reduction of the flue gas temperature makes the chemical reaction of mercury removal proceed in a favorable direction, effectively improving the mercury removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present invention in the first perspective state; Figure 2 is a three-dimensional structural schematic diagram of the present invention in the second perspective state; Figure 3 is a sectional structural schematic diagram of the cooler of the present invention; Figure 4 is a rear view structural schematic diagram of the cooler of the present invention; Figure 5Schematic cross-sectional structure diagram of the flue gas heater of the present invention; Figure 6 Schematic cross-sectional structure diagram of the low-low temperature electrostatic precipitator of the present invention.

[0016] In the figure: cooler 1, low-low temperature electrostatic precipitator 2, first desalted water injection port 3, first desalted water discharge port 4, make-up water tank 5, heat medium water circulation pump 6, heat medium water expansion tank 7, second desalted water injection port 8, flue gas heater 9, desulfurization tower 10, water pump 11, second support leg 12, first support leg 13, third support leg 14, fourth support leg 15, fifth support leg 16, sixth support leg 17, second desalted water discharge port 18, first serpentine pipe 19, stirring blade 20, first connecting pipe 21, stirring shaft 22, first bracket 23, motor 24, second bracket 25, second connecting pipe 26, second serpentine pipe 27, cathode wire 28, hollow pipe 29, spray head 30, anode plate 31, intake pipe 32, outlet pipe 33. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] The cooler 1, low-low temperature electrostatic precipitator 2, first desalted water injection port 3, first desalted water discharge port 4, make-up water tank 5, heat medium water circulation pump 6, heat medium water expansion tank 7, second desalted water injection port 8, flue gas heater 9, desulfurization tower 10, water pump 11, second support leg 12, first support leg 13, third support leg 14, fourth support leg 15, fifth support leg 16, sixth support leg 17, second desalted water discharge port 18, first serpentine pipe 19, stirring blade 20, first connecting pipe 21, stirring shaft 22, first bracket 23, motor 24, second bracket 25, second connecting pipe 26, second serpentine pipe 27, cathode wire 28, hollow pipe 29, spray head 30, anode plate 31, intake pipe 32 and outlet pipe 33 components of the present application are all common standard parts or parts known to those skilled in the art, and their structures and principles can all be known by those skilled in the art through technical manuals or obtained through conventional experimental methods.

[0019] Please refer to Figures 1-6, A low-temperature ESP, comprising a cooler 1, a makeup water tank 5 and a heat medium water expansion tank 7. The right side of the cooler 1 is connected to a low-temperature ESP 2 through a pipeline, and the top of the low-temperature ESP 2 is connected to a desulfurization tower 10 through a pipeline. The right side of the desulfurization tower 10 is connected to a flue gas heater 9 through a pipeline. The right side of the makeup water tank 5 is fixedly connected to a water pump 11. The left side of the heat medium water expansion tank 7 is fixedly connected to a heat medium water circulation pump 6. The inner cavity of the cooler 1 is connected to a first serpentine tube 19 through a first bracket 23, and the inner cavity of the flue gas heater 9 is fixedly connected to a second serpentine tube 27 through a second bracket 25.

[0020] A cooler 1, a low-temperature electrostatic precipitator 2, a make-up water tank 5, a heat medium water expansion tank 7, a flue gas heater 9, a desulfurization tower 10, a cathode wire 28, a hollow pipe 29, a spray head 30 and an anode plate 31 are provided. Flue gas enters the cooler 1 from the inlet pipe 32 and is conveyed by a pipeline to the low-temperature electrostatic precipitator 2. During this process, the cathode wire 28 and the anode plate 31 remove dust. By turning on the external water pump, water can be conveyed through the pipeline into the hollow pipe 29 and discharged from the spray head 30, thereby removing the dust adhering to the surface of the anode plate 31. Then the flue gas is conveyed by a pipeline to the desulfurization tower 10, and finally conveyed by a pipeline to the flue gas heater 9 and discharged from the outlet pipe 33. A heat medium water circulation pump 6, a water pump 11, a first serpentine pipe 19, a stirring blade 20, a first connecting pipe 21, a stirring shaft 22, a motor 24, a second connecting pipe 26 and a second serpentine pipe 27 are provided. By turning on the water pump 11, heat medium water can be conveyed into the heat medium water expansion tank 7. By turning on the heat medium water circulation pump 6, heat medium water can be conveyed into the first serpentine pipe 19, and with the cooperation of the first connecting pipe 21, the heat medium water can be conveyed into the second serpentine pipe 27, and with the cooperation of the second connecting pipe 26, the heat medium water is conveyed into the heat medium water expansion tank 7. By turning on the motor 24, the stirring shaft 22 can be driven to rotate by a single-sided tooth synchronous belt, and the stirring blade 20 can disturb the air in the cooler 1, thereby improving the heat exchange effect. At the same time, the temperature of the flue gas at the inlet of the electrostatic precipitator decreases, resulting in a decrease in the flue gas volume, an increase in the specific collection area, and an increase in the residence time of dust in the electric field, thereby improving the dust removal efficiency. The reduction of the actual flue gas volume can reduce the specifications of downstream equipment, reduce the energy consumption of the fan, and save costs. The decrease in the flue gas temperature causes most of the SO3 in the flue gas to condense into sulfuric acid mist in the low-temperature economizer or MGGH, adhere to the dust and be neutralized by alkaline substances, greatly reducing the specific resistance of the dust and avoiding the back corona phenomenon, further improving the dust removal efficiency. When the low-temperature electrostatic precipitator system uses a low-temperature economizer to reduce the flue gas temperature, coal consumption and plant electricity consumption can be saved. For the units with a subsequent wet desulfurization system, the decrease in the flue gas temperature can not only improve the desulfurization efficiency, but also reduce the process water consumption of wet desulfurization and effectively alleviate the problem of gypsum rain. After the heat recovered from the flue gas is transferred to the wet desulfurization system, the temperature of the flue gas from the chimney is increased to achieve the effect of flue gas dewhiting. The decrease in the flue gas temperature makes the chemical reaction of mercury removal proceed in a favorable direction, effectively improving the mercury removal efficiency.

[0021] An intake pipe 32 is connected to the lower end on the left side of the cooler 1, and an outlet pipe 33 is connected to the upper end on the right side of the flue gas heater 9. Both the front and rear sides of the bottom of the cooler 1 are fixedly connected with first support legs 13. The bottom of the makeup water tank 5 is fixedly connected with a plurality of second support legs 12 distributed at equal intervals. The four sides of the bottom of the low-temperature electrostatic precipitator 2 are fixedly connected with third support legs 14. The bottom of the desulfurization tower 10 is fixedly connected with a plurality of fourth support legs 15 distributed at equal intervals. The bottom of the heat medium water expansion tank 7 is fixedly connected with a plurality of fifth support legs 16 distributed at equal intervals. Both the front and rear sides of the bottom of the flue gas heater 9 are fixedly connected with sixth support legs 17. The upper and lower ends of the inner surface of the cooler 1 are movably connected with stirring shafts 22. Stirring blades 20 are fixedly connected to the outer surface of the stirring shafts 22. The two stirring shafts 22 are connected by a single-sided tooth synchronous belt. The upper end of the back surface of the cooler 1 is fixedly connected with a motor 24, and the output shaft of the motor 24 is connected to the upper stirring shaft 22 through a single-sided tooth synchronous belt. A first demineralized water injection port 3 is provided at the top of the makeup water tank 5. A first demineralized water discharge port 4 is provided at the bottom on the left side of the makeup water tank 5. Sealing covers are threadedly connected to the ends of both the first demineralized water discharge port 4 and the first demineralized water injection port 3. A second demineralized water injection port 8 is provided at the top of the heat medium water expansion tank 7. A second demineralized water discharge port 18 is provided at the bottom on the right side of the heat medium water expansion tank 7. Sealing covers are threadedly connected to the ends of both the second demineralized water discharge port 18 and the second demineralized water injection port 8. A cathode wire 28 is fixedly connected to the left end of the inner cavity of the low-temperature electrostatic precipitator 2. An anode plate 31 is fixedly connected to the right end of the inner cavity of the low-temperature electrostatic precipitator 2. A hollow pipe 29 is fixedly connected to the top of the inner cavity of the low-temperature electrostatic precipitator 2. A plurality of nozzles 30 are provided at the bottom of the hollow pipe 29 and are distributed at equal intervals. The hollow pipe 29 is connected to the output end of an external water pump through a pipeline. The input end of the water pump 11 is connected to the bottom of the makeup water tank 5 through a pipeline. The output end of the water pump 11 is connected to the top of the heat medium water expansion tank 7 through a pipeline. The input end of the heat medium water circulation pump 6 is connected to the bottom of the heat medium water expansion tank 7 through a pipeline. The output end of the heat medium water circulation pump 6 is connected to the first serpentine pipe 19 through a pipeline. The number of the first serpentine pipes 19 is two. The two first serpentine pipes 19 are connected by a first connecting pipe 21. The back surface of the first serpentine pipe 19 is connected to the second serpentine pipe 27 through a pipeline. The number of the second serpentine pipes 27 is three. The three second serpentine pipes 27 are connected by a second connecting pipe 26. The end of the second serpentine pipe 27 is connected to the top of the heat medium water expansion tank 7 through a pipeline.

[0022] A method for treating soot using a low-temperature electrostatic precipitator includes the following steps: A. Flue gas enters the cooler 1 at the inlet pipe 32 and is transported by pipelines to the low-low temperature electrostatic precipitator 2. During this process, the cathode wires 28 and anode plates 31 remove dust. By turning on the external water pump, water can be transported through pipelines into the hollow pipe 29 and discharged from the nozzle 30, thereby removing the dust adhering to the surface of the anode plates 31. Then the flue gas is transported by pipelines to the desulfurization tower 10, and finally transported by pipelines to the flue gas heater 9 and discharged from the outlet pipe 33; B. During this process, by turning on the water pump 11, the heat transfer medium water can be transported into the heat transfer medium water expansion tank 7. By turning on the heat transfer medium water circulation pump 6, the heat transfer medium water can be transported into the first serpentine pipe 19, and with the cooperation of the first connecting pipe 21, the heat transfer medium water can be transported into the second serpentine pipe 27, and with the cooperation of the second connecting pipe 26, the heat transfer medium water is transported into the heat transfer medium water expansion tank 7; C. By turning on the motor 24, the stirring shaft 22 can be driven to rotate through the single-sided tooth synchronous belt, enabling the stirring blades 20 to disturb the air in the cooler 1, thereby improving the heat exchange effect.

[0023] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature electrostatic precipitator, comprising a cooler (1), a makeup water tank (5) and a heat medium water expansion tank (7), characterized in that: The right side of the cooler (1) is connected to a low-temperature electrostatic precipitator (2) through a pipeline, and the top of the low-temperature electrostatic precipitator (2) is connected to a desulfurization tower (10) through a pipeline. The right side of the desulfurization tower (10) is connected to a flue gas heater (9) through a pipeline. The right side of the makeup water tank (5) is fixedly connected to a water pump (11). The left side of the heat medium water expansion tank (7) is fixedly connected to a heat medium water circulation pump (6). The inner cavity of the cooler (1) is connected to a first serpentine tube (19) through a first bracket (23), and the inner cavity of the flue gas heater (9) is fixedly connected to a second serpentine tube (27) through a second bracket (25).

2. The low-low temperature electrostatic precipitator according to claim 1, characterized in that: The lower end of the left side of the cooler (1) is connected to an intake pipe (32), and the upper end of the right side of the flue gas heater (9) is connected to an outlet pipe (33).

3. The low-low temperature electrostatic precipitator according to claim 1, characterized in that: Both the front and rear sides of the bottom of the cooler (1) are fixedly connected to first support legs (13). The bottom of the makeup water tank (5) is fixedly connected to a plurality of second support legs (12) evenly distributed at equal intervals. The four sides of the bottom of the low-temperature electrostatic precipitator (2) are fixedly connected to third support legs (14).

4. The low-temperature and low-temperature electrostatic precipitator according to claim 1, characterized in that: The bottom of the desulfurization tower (10) is fixedly connected to a plurality of fourth support legs (15) evenly distributed at equal intervals. The bottom of the heat medium water expansion tank (7) is fixedly connected to a plurality of fifth support legs (16) evenly distributed at equal intervals. Both the front and rear sides of the bottom of the flue gas heater (9) are fixedly connected to sixth support legs (17).

5. The low-low temperature electrostatic precipitator according to claim 1, wherein: Both the upper and lower ends of the inner surface of the cooler (1) are movably connected to stirring shafts (22). Stirring blades (20) are fixedly connected to the outer surface of the stirring shafts (22). The two stirring shafts (22) are connected by a single-sided tooth synchronous belt. The upper end of the back of the cooler (1) is fixedly connected to a motor (24), and the output shaft of the motor (24) is connected to the upper stirring shaft (22) through a single-sided tooth synchronous belt.

6. The low-temperature and low-temperature electrostatic precipitator according to claim 1, wherein: The top of the makeup water tank (5) is provided with a first demineralized water injection port (3). The bottom of the left side of the makeup water tank (5) is provided with a first demineralized water discharge port (4). The ends of both the first demineralized water discharge port (4) and the first demineralized water injection port (3) are threadedly connected with sealing caps.

7. The low-low temperature electrostatic precipitator according to claim 1, characterized in that: The top of the heat medium water expansion tank (7) is provided with a second demineralized water injection port (8). The bottom of the right side of the heat medium water expansion tank (7) is provided with a second demineralized water discharge port (18). The ends of both the second demineralized water discharge port (18) and the second demineralized water injection port (8) are threadedly connected with sealing caps.

8. The low-low temperature electrostatic precipitator according to claim 1, wherein: The left end of the inner cavity of the low-temperature electrostatic precipitator (2) is fixedly connected to a cathode wire (28). The right end of the inner cavity of the low-temperature electrostatic precipitator (2) is fixedly connected to an anode plate (31). The top of the inner cavity of the low-temperature electrostatic precipitator (2) is fixedly connected to a hollow tube (29). A plurality of nozzles (30) evenly distributed at equal intervals are arranged at the bottom of the hollow tube (29). The hollow tube (29) is connected to the output end of an external water pump through a pipeline.

9. The low-low temperature electrostatic precipitator according to claim 1, wherein: The input end of the water pump (11) is communicated with the bottom of the makeup water tank (5) through a pipeline, and the output end of the water pump (11) is communicated with the top of the heat medium water expansion tank (7) through a pipeline. The input end of the heat medium water circulation pump (6) is communicated with the bottom of the heat medium water expansion tank (7) through a pipeline, and the output end of the heat medium water circulation pump (6) is communicated with the first serpentine tube (19) through a pipeline. The number of the first serpentine tubes (19) is two, and the two first serpentine tubes (19) are communicated with each other through a first connecting pipe (21). The back of the first serpentine tube (19) is communicated with the second serpentine tube (27) through a pipeline. The number of the second serpentine tubes (27) is three, and the three second serpentine tubes (27) are communicated with each other through a second connecting pipe (26). And the end of the second serpentine tube (27) is communicated with the top of the heat medium water expansion tank (7) through a pipeline.

10. A method for treating soot by using the low-low temperature electrostatic precipitator according to any one of claims 1-9, characterized in that: It includes the following steps: A. Flue gas enters the cooler (1) from the inlet pipe (32) and is conveyed to the low-temperature and low-dust electrostatic precipitator (2) through a pipeline. During this process, the cathode wire (28) and the anode plate (31) remove dust. By turning on the external water pump, water can be conveyed into the hollow pipe (29) through a pipeline and discharged from the spray head (30), so as to remove the dust adhered to the surface of the anode plate (31). Then the flue gas is conveyed to the desulfurization tower (10) through a pipeline and finally conveyed to the flue gas heater (9) through a pipeline and finally discharged from the outlet pipe (33). B. During this process, by turning on the water pump (11), heat medium water can be conveyed into the heat medium water expansion tank (7). By turning on the heat medium water circulation pump (6), heat medium water can be conveyed into the first serpentine tube (19), and with the cooperation of the first connecting pipe (21), heat medium water can be conveyed into the second serpentine tube (27), and with the cooperation of the second connecting pipe (26), heat medium water is conveyed into the heat medium water expansion tank (7). C. By turning on the motor (24), the stirring shaft (22) can be driven to rotate through a single-sided tooth synchronous belt, and the stirring blades (20) can disturb the air in the cooler (1), thereby improving the heat exchange effect.

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