Cathode material pre-carbonization flue gas cooling and pre-desulfurization system

Abstract

The utility model discloses a cathode material pre-carbonization flue gas cooling and pre-desulfurization system, and belongs to the field of flue gas spraying and impurity removal. The device comprises a spray cooling tower, the lower part of the spray cooling tower is provided with a gas inlet for pre-carbonized flue gas to enter, the upper part of the spray cooling tower is provided with a liquid inlet which is communicated with RO concentrated water through a pipeline, and the pipeline is provided with an upper-section spray pump and a spray electric valve, so that the RO concentrated water enters a spray pipeline inside the spray cooling tower; a tower breaking plate is arranged between the lower gas inlet and the upper liquid inlet in the spray cooling tower, and the pre-carbonized flue gas enters the lower area of the spray cooling tower through the lower gas inlet, then penetrates through the tower breaking plate, enters the upper area of the spray cooling tower and is subjected to spray treatment by a spray liquid with RO concentrated water. The device disclosed by the utility model can simultaneously remove SO2 in flue gas generated in a pre-carbonization process and calcium ions in secondary RO concentrated water of the clean sewage recycling device, and can not add alkaline substances any more, so that the ion content in the water is reduced while the material consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas spraying and impurity removal, and more specifically to a negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system. Background Art

[0002] Negative electrode materials usually refer to the materials used for the negative electrode (anode) in batteries, and are mainly used in various electrochemical energy storage devices such as lithium-ion batteries and nickel-metal hydride batteries. These materials need to have certain properties, such as high electrical conductivity, good ion conductivity, high specific surface area, etc., to achieve efficient charge / discharge processes.

[0003] In lithium-ion batteries, which are most frequently used in daily life, common negative electrode materials include:

[0004] Natural or artificial graphite: It is one of the most commonly used negative electrode materials with good cycle stability and conductivity.

[0005] Silicon-based materials: have higher theoretical specific capacity, but need to solve the problem caused by volume expansion.

[0006] Carbon-based materials: such as graphene, carbon nanotubes, etc., have excellent electrical conductivity and chemical stability.

[0007] In other types of batteries, the choice of negative electrode materials will also be different, but they usually need to meet similar requirements. Continuous research and development of new negative electrode materials is one of the important ways to improve battery performance and energy density.

[0008] At present, the negative electrode material with the highest degree of commercial application is graphite among carbon materials, especially artificial graphite. This type of production requires high-temperature calcination of raw materials, that is, entering the pre-carbonization process, to lay the foundation for the final graphitization of carbon materials. In this process, high-temperature flue gas is easily generated, which contains a lot of SO2 and other pollutants. If it is directly discharged into the atmosphere, it will cause serious pollution and requires a series of treatments. Therefore, with the strong demand for batteries today, low-carbon and environmentally friendly production methods are also something we need to consider.

[0009] With the increasing requirements for environmental protection, clean sewage such as circulating water and boiler sewage in coking and chemical enterprises needs to be treated to meet the standards for reuse, and ultimately achieve the goal of zero discharge of external drainage. In the process of clean sewage reuse, concentrated water is usually produced by the secondary RO device, which is generally directly sent to the biochemical deep treatment system for treatment. Because this concentrated water contains high total hardness and alkalinity, a large amount of hardness removal agents need to be added for treatment to meet the water inlet requirements of subsequent membrane treatment processes. If the concentrated water produced by the secondary RO device in the clean sewage reuse system is pre-hardened, the load of biochemical deep treatment can be reduced.

[0010] After searching, the patent with publication number CN203764127U discloses a tunnel kiln desulfurization tower, the upper end of the tunnel kiln is provided with a flue gas duct, a fan is installed at the tail end of the flue gas duct, the fan is connected to one end of the spray device I, the other end of the spray device I is connected to one end of the flue gas duct, the other end of the flue gas duct is connected to the chimney, the upper end of the chimney is built with a spray device II, the lower end of the spray device I and the bottom of the chimney are equipped with a pipeline, the pipeline is connected to the alkali pool, and the alkali pool is connected to the spray device II through the pipeline to form a cycle. This device can reduce sulfur dioxide in flue gas to a certain extent, but on the one hand, it will consume alkaline solution, and on the other hand, the generated sulfate solution needs to be processed, causing working pressure of the biochemical station.

[0011] For example, the patent with publication number CN218723051 U discloses a pre-carbonization device for negative electrode materials of lithium batteries, including an externally heated rotary kiln, the flue gas inlet of the externally heated rotary kiln is connected to the flue gas generation system, and the flue gas outlet is connected to the flue gas circulation system; the outlet of the flue gas circulation system is divided into two paths, one is connected to the flue gas generation system, and the other is connected to the heating pipeline of the pyrolysis gas purification system, and the heating pipeline is used to heat the pyrolysis gas purification system; one end of the pyrolysis gas purification system is connected to the discharge port of the externally heated rotary kiln, and the other end is connected to the flue gas generation system. This design only utilizes the waste heat in the pre-carbonization device, and does not mention how to deal with the pollutants in the generated flue gas, especially sulfur dioxide. Utility Model Content

[0012] 1. Technical problems to be solved by the utility model

[0013] In view of the fact that the flue gas from the pre-carbonization of negative electrode materials in the prior art contains a large amount of sulfur-containing pollutants and is inconvenient to be directly discharged, the utility model intends to provide a flue gas cooling and pre-desulfurization system for pre-carbonization of negative electrode materials to remove sulfur-containing compounds, especially SO2, from the flue gas spray water generated by the pre-carbonization process in the negative electrode material industry; the system uses the alkaline secondary RO concentrated water containing calcium hardness generated by the clean sewage reuse system to spray the flue gas, which can effectively reduce the sulfur dioxide in the flue gas and the calcium ions in the wastewater generated by the clean sewage reuse system; the system as a whole has a low design investment, is environmentally friendly, and has good comprehensive use effects.

[0014] 2. Technical solution

[0015] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0016] The utility model discloses a negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system, comprising a spray cooling tower, wherein an air inlet is arranged at the lower part of the spray cooling tower for the pre-carbonization flue gas to enter, and a liquid inlet is arranged at the upper part of the spray cooling tower, which is connected with RO concentrated water through a pipeline, and an upper spray pump and a spray electric valve are arranged on the pipeline, so that the RO concentrated water enters the spray pipeline inside the spray cooling tower; a break tower plate is arranged between the lower air inlet and the upper liquid inlet in the spray cooling tower, and after the pre-carbonization flue gas enters the lower area of ​​the spray cooling tower through the lower air inlet, it passes through the break tower plate and enters the upper area of ​​the spray cooling tower, and is sprayed by the spray liquid with RO concentrated water.

[0017] The utility model introduces the flue gas generated in the pre-carbonization process into the spray cooling tower, such as the high-temperature flue gas of 120-180°C in the pre-carbonization tunnel kiln into the spray cooling tower, and the SO2 content of the flue gas is generally about 20-200ppm; and the secondary RO concentrated water generated in the clean sewage reuse system is introduced into the spray system inside the spray cooling tower through a pipeline, and the secondary RO concentrated water generated by the clean sewage reuse device has a pH of about 8.0-8.8, a conductivity of about 2800-3300μs / cm, a total hardness of about 1200-1600mg / L, and a total alkali of about 600-1000mg / L; the spray water mixed with the secondary RO concentrated water contains Ca 2+ The SO2 in the flue gas is washed away by the spray cooling process, and then naturally oxidized by air to form calcium sulfate precipitation. This method kills two birds with one stone, removing SO2 and a small amount of H2S dissolved in the water during the spray cooling process, and removing Ca 2+ , reduce the hardness in the water, lay the foundation for the subsequent deep treatment of wastewater, and reduce the dosage of hardness removal drugs.

[0018] Furthermore, in practice, it also includes an electrostatic precipitator and a wet flue gas desulfurization equipment. The top of the spray cooling tower is provided with a flue gas pipeline after pre-desulfurization connected to the electrostatic precipitator. Because the droplets captured by the electrostatic precipitator contain tar, a heater is provided at the bottom of the electrostatic precipitator to ensure that the bottom temperature is about 80°C. The tar mixture has fluidity at this temperature, and the bottom outlet of the electrostatic precipitator is connected to the mixed liquid vent tank. The tar mixture flows into the mixed liquid vent tank and is then pumped to the tar ammonia separation tank of the cold drum section of the coking plant for separation; the top flue gas outlet of the electrostatic precipitator is connected to the wet flue gas desulfurization equipment through a pipeline, and an induced draft fan is provided on the pipeline. The flue gas after spray cooling and pre-desulfurization enters the electrostatic precipitator for further removal of tar and other impurities. The pre-carbonized flue gas from which impurities such as tar have been removed is sent by the induced draft fan to the wet flue gas desulfurization equipment for desulfurization together with the sulfur-containing flue gas generated by the graphitization process. The utility model adopts wet desulfurization, and the flue gas will contain relatively high water vapor and dust caused by the process. It is necessary to adopt wet electrostatic precipitator in the wet desulfurization system to further remove pollutants in the flue gas and discharge it after meeting the atmospheric pollutant emission standards.

[0019] Furthermore, the outer edge of the broken tower plate is connected to the inner wall of the spray cooling tower, thereby dividing the internal area of ​​the spray cooling tower into upper and lower parts; a channel tube extending upward is provided in the middle of the broken tower plate, and the channel tube is a hollow tube so that the upper area of ​​the spray cooling tower is connected with the lower area; and a cover is provided above the channel tube, and the cover is conically covered above the channel tube, and there is a gap between the cover and the channel tube, so that the pre-carbonized flue gas in the lower area of ​​the spray cooling tower can enter the upper area from the gap, while the spray liquid in the upper area is blocked by the cover and cannot flow into the lower area. The cover can completely cover the opening of the channel tube in the middle of the broken tower plate, and the conical structure of the cover also has a diversion effect, so that the spray liquid sprayed down is quickly diverted to the surrounding area below through the cover, and will not flow into the channel tube in the middle of the broken tower plate. In coordination with this, an overflow port is also provided on the side wall of the spray cooling tower and is connected to an overflow pipe, and the overflow pipe is connected to the second clarification tank. The height of the overflow port is lower than the top height of the middle channel tube of the broken tower plate and higher than the bottom height of the broken tower plate, so that the spray liquid in the upper area of ​​the spray cooling tower is gathered and discharged through the overflow pipe without flowing into the lower area of ​​the spray cooling tower.

[0020] The utility model recovers the upper spray liquid through the overflow pipe to the second clarification tank for clarification so as to realize recycling. The second clarification tank is provided with a pH meter to control the pH value between 6.5 and 7.5. If the pH is low, the flow rate of the secondary RO concentrated water is increased. The outlet of the second clarification tank is connected with a reflux pipe, and the reflux pipe is provided with a lower spray pump and a conductivity meter. The conductivity meter performs online conductivity detection, and the outlet of the reflux pipe is connected to the lower area of ​​the spray cooling tower for circulating spraying of the pre-carbonized flue gas.

[0021] Furthermore, the lower part of the spray cooling tower is also provided with a discharge port connected to the clarification drainage pipe, the clarification drainage pipe is connected to the first clarification tank, and the first clarification tank is connected in series with the second clarification tank. The first clarification tank is provided with a pH meter and a liquid level meter, and the bottom of the first clarification tank is provided with a sewage outlet. The circulating coolant refluxed from the spray cooling tower is returned to the clarification tank for clarification. It is set as two clarification tanks in series. Normally, both are fully opened. When one is overhauled and cleaned, only one clarification tank can be opened. An online pH meter is set in the first clarification tank, and the pH value is controlled between 5.5-6.5; an online pH meter is also set in the second clarification tank, and the pH value is controlled between 6.5-7.5. In practice, a spare device can be set for each of the first clarification tank and the second clarification tank, and the spare clarification tank and the clarification tank in use can also be used at the same time. When the first and second clarification tanks are cleaned, the spare first clarification tank and the second clarification tank can be put into use immediately. The clarification tank and the spare clarification tank can also be used at the same time.

[0022] Furthermore, the bottom of the spray cooling tower is also connected to a venting pipe, which is provided with a venting electric valve, and the outlet of the venting pipe is connected to the spray liquid venting tank, and the outlet of the spray liquid venting tank is connected to the wastewater deep treatment equipment. When the conductivity meter on the return pipe detects that the conductivity of the return spray liquid is about 6000-7000μs / cm, it is necessary to take out part of the spray liquid and vent it to the spray liquid venting tank, and then pump it to the wastewater deep treatment section for treatment.

[0023] In order to achieve a better desulfurization effect, the utility model adopts a two-stage spraying process. The high-temperature flue gas is first sprayed with bottom circulating water to cool down and remove part of SO2. The circulating water can be left to stand in the clarification tank to separate impurities such as calcium sulfate, calcium sulfide, and carbon powder. Part of the supernatant is returned to the spraying system in the lower area, and the rest is sent to biochemical treatment. The spraying water in the upper area is the secondary RO concentrated water of the clean sewage reuse device, which can be further cooled and continue to absorb part of the SO2 in the flue gas. If there is no secondary RO concentrated water on site, it can also be replaced by more common circulating water sewage that reaches the specified concentration multiple.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0026] (1) The cooling and pre-desulfurization system of the utility model can simultaneously remove SO2 in the flue gas generated in the pre-carbonization process and calcium ions in the secondary RO concentrated water of the clean sewage recycling device, and no alkaline substances need to be added, which can save material consumption and reduce the ion content in the water.

[0027] (2) The cooling and pre-desulfurization system of the utility model adopts a reasonable circulation design of secondary desulfurization. The circulating water continuously absorbs SO2, and the clarifier separates calcium sulfate to ensure the stable operation of the circulation. When the circulating water quality needs to be replaced, it can also be discharged into the biochemical system. The water quality of the clean sewage is better than that of the circulating water, and can be used as the final washing water, or it can flow to the bottom by gravity and be used as circulating water, which can save water resources.

[0028] (3) The cooling and pre-desulfurization system of the utility model does not use sodium hydroxide for neutralization and washing, which can avoid the reaction of sodium hydroxide with H2S in the flue gas to form sulfide, thereby increasing the load on subsequent biochemical treatment; only concentrated brine containing high hardness is used for washing, which can make the Ca 2+ It reacts with H2S to generate CaS precipitate, thereby reducing the sulfide content in the wastewater; it also reduces the hardness in the wastewater and reduces the load of hardness removal in the high-density pool in the subsequent deep treatment section of the biochemical process.

[0029] (4) The cooling and pre-desulfurization system of the utility model pre-treats the sulfur-containing compounds while cooling the sulfur-containing flue gas produced by the pre-carbonization device, thereby reducing the burden on the subsequent desulfurization device. At the same time, due to the cooling effect, part of the organic pollutants in the flue gas are also washed away, making the gypsum produced by the subsequent wet desulfurization device purer and easier to handle and sell.

[0030] (5) The cooling and pre-desulfurization system of the utility model is provided with a first clarification tank and a second clarification tank. The first clarification tank is used to precipitate and remove calcium sulfate through pH adjustment, and the second clarification tank is used to increase the pH by adding secondary RO concentrated water, so that the spray water will not generate calcium sulfate scale in the spray tower, thereby clogging the spray tower.

[0031] (6) The cooling and pre-desulfurization system of the utility model introduces secondary RO concentrated water to cool the pre-carbonized flue gas, so that the sulfur content of the pre-carbonized negative electrode material raw materials can be increased from less than 0.5% to more than 2%, thereby greatly reducing the raw material cost of the negative electrode material process and improving the efficiency of the negative electrode material pre-carbonization process.

[0032] (7) The cooling and pre-desulfurization system of the utility model has a high degree of automation, can automatically control the system pH, and prevent calcium sulfate scaling and clogging in the spray tower.

[0033] (8) The cooling and pre-desulfurization system of the utility model adopts secondary RO concentrated water or circulating water wastewater with medium alkalinity as water for spray cooling, so it will not cause corrosion to the system itself, and has a certain buffering effect on the system. If the direct addition of sodium hydroxide liquid alkali is adopted, the pH value fluctuates violently, which is more likely to cause corrosion to the equipment. The utility model can effectively prevent corrosion. Only glass flake coating is needed for heavy corrosion protection in the spray cooling tower. There is no need to use fiberglass lining or other anti-corrosion coatings, which can effectively reduce investment. At the same time, the blades of the subsequent induced draft fan after the electric tar precipitator only need ordinary impellers, and there is no need to use duplex stainless steel impellers, which reduces investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the flue gas cooling and pre-desulfurization system for pre-carbonization of negative electrode materials of the utility model.

[0035] Explanation of the symbols in the schematic diagram:

[0036] 100, spray cooling tower; 101, broken tower plate; 102, capping; 103, flue gas pipeline after pre-desulfurization; 104, overflow pipeline; 105, clarification and drainage pipeline; 106, first clarification tank; 107, second clarification tank; 108, reflux pipeline; 109, lower spray pump; 110, conductivity meter; 111, upper spray pump; 112, spray electric valve; 113, venting pipeline; 114, venting electric valve; 115, spray liquid venting tank;

[0037] 200, electric tar collector; 201, induced draft fan; 202, mixed liquid drain tank;

[0038] 300. Wet desulfurization equipment. DETAILED DESCRIPTION

[0039] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings.

[0040] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0041] In addition, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components; the terms "first", "second", "third", and "fourth" should be understood in a broad sense, and are only used to distinguish feature names, and do not indicate a specific order relationship. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0042] The utility model is further described below in conjunction with embodiments.

[0043] Example 1

[0044] The amount of flue gas generated by the pre-carbonization process of a company's negative electrode material factory is 11000m 3 / h, containing 200PPm SO2, after the negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system of the utility model, the secondary RO concentrated water is used for cooling and pre-desulfurization, the flue gas contains 100PPm SO2, and the secondary RO concentrated water used is 2m 3 / h, the flue gas temperature is cooled to 90℃.

[0045] The main harmful substances contained in the pre-carbonized flue gas are asphalt smoke, SO2, and NOx. The NOx content in the flue gas is ~75mg / m 3 , meet the emission standards, and do not set up corresponding treatment measures.

[0046] In the spray cooling tower, only glass flake coating is needed for heavy corrosion protection, and there is no need for fiberglass lining.

[0047] The spray cooling tower adopts the form of an air spray tower, which can reduce the risk of increased resistance caused by filler scaling caused by the use of packed towers.

[0048] Example 2

[0049] Using the negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system of the utility model, when the flue gas of the pre-carbonization process of a company enters the spray cooling tower 100 for treatment, the conductivity meter 110 after the lower spray pump 109 is linked with the spray liquid venting electric valve 114. When the conductivity is 6000-7000μs / cm, the venting electric valve 114 is opened. When the liquid level meter of the first clarification tank 106 drops by 200mm, the spray electric valve 112 is opened to increase the system supplementary water to keep the system liquid level and system conductivity stable. When the pH meter of the second clarification tank 107 shows less than 6.5, the spray electric valve 112 is opened to increase the supplementary secondary RO concentrated water.

[0050] The protection scope of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will easily recognize that alternative structures to the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A system for cooling and pre-desulfurizing flue gas for pre-carbonization of negative electrode materials, comprising a spray cooling tower (100), characterized in that: The lower part of the spray cooling tower (100) is provided with an air inlet for the pre-carbonized flue gas to enter, and the upper part of the spray cooling tower (100) is provided with a liquid inlet which is connected to RO concentrated water through a pipeline, so that the RO concentrated water enters the spray pipeline inside the spray cooling tower (100); a break plate (101) is provided between the lower air inlet and the upper liquid inlet in the spray cooling tower (100), and the pre-carbonized flue gas enters the lower area of ​​the spray cooling tower (100) through the lower air inlet, and then passes through the break plate (101) into the upper area of ​​the spray cooling tower (100), and is sprayed with the spray liquid containing RO concentrated water.

2. A negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system according to claim 1, characterized in that: The outer edge of the broken tower plate (101) is connected to the inner wall of the spray cooling tower (100), thereby dividing the internal area of ​​the spray cooling tower (100) into upper and lower parts; a channel pipe extending upward is provided in the middle of the broken tower plate (101), and the channel pipe is a hollow pipe so that the upper area of ​​the spray cooling tower (100) is connected with the lower area; and a cover (102) is provided above the channel pipe, and the cover (102) is conically covered above the channel pipe, and there is a gap between the cover (102) and the channel pipe, so that the pre-carbonized flue gas in the lower area of ​​the spray cooling tower (100) can enter the upper area through the gap, while the spray liquid in the upper area is blocked by the cover (102) and cannot flow into the lower area.

3. A negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system according to claim 2, characterized in that: An overflow port is also provided on the side wall of the spray cooling tower (100) and is connected to an overflow pipe (104). The overflow pipe (104) is connected to the second clarification tank (107). The height of the overflow port is lower than the top height of the middle channel pipe of the broken tower plate (101) and higher than the bottom height of the broken tower plate (101), so that the spray liquid in the upper area of ​​the spray cooling tower (100) is collected and discharged through the overflow pipe (104) without flowing into the lower area of ​​the spray cooling tower (100).

4. A negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system according to claim 3, characterized in that: The outlet of the second clarification tank (107) is connected to a reflux pipe (108), a lower spray pump (109) is provided on the reflux pipe (108), and the outlet of the reflux pipe (108) is connected to the lower area of ​​the spray cooling tower (100) for circulating and spraying the pre-carbonized flue gas.

5. A negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system according to claim 4, characterized in that: A pH meter is provided in the second clarification tank (107), and a conductivity meter (110) is also provided on the reflux pipe (108).

6. A negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system according to claim 4, characterized in that: The spray cooling tower (100) is also provided with a discharge port at the bottom thereof, which is connected to a clarification discharge pipe (105). The clarification discharge pipe (105) is connected to a first clarification tank (106). The first clarification tank (106) is connected in series with a second clarification tank (107). A pH meter and a liquid level meter are provided in the first clarification tank (106), and a sewage discharge port is provided at the bottom of the first clarification tank (106).

7. A negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system according to any one of claims 1 to 6, characterized in that: The bottom of the spray cooling tower (100) is also connected to a vent pipe (113), on which a vent electric valve (114) is provided, and the outlet of the vent pipe (113) is connected to a spray liquid vent tank (115), and the outlet of the spray liquid vent tank (115) is connected to a wastewater deep treatment device.

8. A negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system according to any one of claims 1 to 6, characterized in that: It also includes an electric tar collector (200), a pre-desulfurized flue gas pipeline (103) connected to the electric tar collector (200) is provided at the top of the spray cooling tower (100), a heater is provided at the bottom of the electric tar collector (200), and the bottom outlet of the electric tar collector (200) is connected to the mixed liquor vent tank (202).

9. A negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system according to claim 8, characterized in that: It also includes a wet desulfurization device (300), wherein the top flue gas outlet of the electric tar collector (200) is connected to the wet desulfurization device (300) via a pipeline, and an induced draft fan (201) is provided on the pipeline.

10. A negative electrode material pre-carbonization flue gas cooling and pre-desulfurization system according to claim 8, characterized in that: An upper spray pump (111) and a spray electric valve (112) are provided on a pipeline at the upper part of the spray cooling tower (100) which is connected to the RO concentrated water.

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