A top coal gas treatment system and method, a blast furnace

Abstract

The present application provides a kind of top coal gas treatment system and method, a kind of blast furnace, comprising: by top coal gas supply pipeline to cooling tower and is supplied with top coal gas, and, by cooling water supply pipeline to cooling tower and is supplied with cooling water, cooling water and top coal gas contact after top coal gas heat exchange cooling;And, by softening water supply pipeline to cooling tower and is supplied with purified water, purified water is used to top coal gas after heat exchange cooling is purified;And, the top gas outlet of cooling tower is communicated with purified top coal gas downstream conveying pipeline, and the top coal gas that is treated by heat exchange cooling and purification is exported to outside.In cooling tower, cooling water and top coal gas can be directly contacted heat exchange cooling, softening water and top coal gas after heat exchange cooling can be directly contacted washing purification;Therefore, the present application can be in cooling tower and carry out two different purification top coal gas flow, equivalent to in the same set of device can simultaneously realize top coal gas cooling and dust removal.

Description

Technical Field

[0001] This invention relates to the fields of gas treatment and iron and steel smelting technology, and in particular to a top gas treatment system and method, and a blast furnace. Background Technology

[0002] Currently, 90% of my country's steel industry uses the long-process production technology of blast furnace and converter, while the proportion of the short-process technology of shaft furnace + electric furnace is relatively low. Furthermore, given the current energy situation, coal is one of the main fossil fuels for the steel industry. Under these circumstances, converting carbon to hydrogen or other energy sources presents significant technological challenges and high costs. Therefore, improving the utilization efficiency of existing coal gas resources and gradually optimizing the energy structure are the main technological directions for the steel industry's low-carbon transformation. Consequently, the chemical utilization of coal gas is receiving increasing attention. Since the top gas of conventional blast furnaces contains approximately 50% nitrogen, the separation of nitrogen and CO is costly and complex, leading to the development of oxygen blast furnaces. Therefore, the top gas from oxygen blast furnaces can be pressurized and decarbonized, then circulated back into the blast furnace as a reducing medium.

[0003] In addition to the main components such as CO, CO2, H2O, N2, and H2, blast furnace top gas also contains trace amounts of sulfides (H2S, COS, CS2), chlorides (HCl, NH4Cl), and dust. Due to its high temperature, the top gas needs to be cooled to meet the requirements of subsequent processes. Furthermore, the top gas contains impurities such as water vapor and HCl. During cooling, condensate continuously forms, and the HCl impurities dissolve in water, creating an acidic environment that corrodes equipment. Therefore, the top gas needs pretreatment before entering downstream processes to prevent corrosion and blockage of equipment by its impurities, thus avoiding equipment malfunctions. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a top gas treatment system and method, and a blast furnace, to solve the problems of equipment failure caused by the corrosion and blockage of equipment by impurities contained in the top gas in the prior art.

[0005] To achieve the above and other related objectives, the present invention provides a top gas treatment system, the system comprising:

[0006] Cooling and purification tower;

[0007] A top gas supply pipeline is connected to the bottom inlet of the cooling and purification tower and is used to supply top gas to the cooling and purification tower.

[0008] A cooling water supply pipeline is connected to the central inlet of the cooling and purification tower, and is used to supply cooling water to the cooling and purification tower, and to use the cooling water to exchange heat and cool the top coal gas after contacting the top coal gas.

[0009] A softened water supply pipeline is connected to the upper inlet of the cooling and purification tower to supply purified water to the cooling and purification tower and to purify the top gas after heat exchange and cooling using the purified water.

[0010] The top gas outlet of the cooling and purification tower is connected to the downstream pipeline of the purified top coal gas, and is used to output the top coal gas that has undergone heat exchange, cooling and purification treatment to the outside.

[0011] In one embodiment of the present invention, the system further includes:

[0012] A cooling tower is connected to the bottom liquid outlet of the cooling and purification tower, and is used to cool the cooling water flowing out of the bottom liquid outlet and then use it as circulating cooling water for reuse.

[0013] A cooling water pool, connected to the cooling tower, is used to store circulating cooling water for recycling.

[0014] A cooling water circulation pump, connected to the cooling water pool, is used to pressurize the circulating cooling water;

[0015] The self-cleaning filter is connected to the outlet of the cooling water circulation pump and the inlet of the cooling water supply pipe. It is used to filter the circulating cooling water output by the cooling water circulation pump, supply the purified circulating cooling water to the cooling purification tower through the cooling water supply pipe, and discharge the wastewater generated during the filtration of the circulating cooling water to the wastewater collection tank.

[0016] In one embodiment of the present invention, the system further includes:

[0017] The softened water replenishment pipeline connects to the external softened water network and is used to replenish softened water.

[0018] A replenishment pump is used to pressurize the replenished softened water. The inlet of the replenishment pump is connected to the outlet of the softened water replenishment pipeline, and the outlet of the replenishment pump is connected to the inlet of the softened water supply pipeline.

[0019] A softened water circulation pump is used to pressurize the softened water flowing out of the middle outlet of the cooling and purification tower and then use it as circulating softened water for reuse. The inlet of the softened water circulation pump is connected to the middle outlet of the cooling and purification tower, and the outlet of the softened water circulation pump is connected to the inlet of the softened water supply pipeline and the outlet of the replenishment pump.

[0020] In one embodiment of the present invention, the system further includes:

[0021] The first flow control valve is connected to the softened water supply pipeline and is used to control the softened water circulation flow rate.

[0022] A wastewater discharge pipe is connected to the softened water circulation pump and is used to discharge softened wastewater;

[0023] The sampling port is connected to the wastewater discharge pipe and is used by external personnel to collect samples of the circulating softened wastewater. The samples are used to analyze the impurity content in the circulating softened water.

[0024] In one embodiment of the present invention, the cooling water tank is further provided with:

[0025] A bypass pump is connected to the cooling water tank, the bypass filter, and the wastewater collection tank, respectively, and is used to pressurize the circulating cooling water in the cooling water tank and allow it to flow out to the bypass filter and the wastewater collection tank, respectively.

[0026] A bypass filter is used to remove impurities and dust from the circulating cooling water and to discharge the purified circulating cooling water to the cooling water pool, as well as to discharge the wastewater generated during the purification of the circulating cooling water to the wastewater collection pool.

[0027] A dosing device, connected to the cooling water tank, is used to add chemicals to the cooling water tank.

[0028] In one embodiment of the present invention, the system further includes:

[0029] A wastewater pump, connected to the wastewater collection tank, is used to pressurize the wastewater in the wastewater collection tank and allow it to flow out to the external production wastewater pipeline network.

[0030] In one embodiment of the present invention, the bottom liquid outlet of the cooling purification tower is further connected to a circulating cooling water drainage pipe, and the circulating cooling water drainage pipe is equipped with a liquid level control valve, which is used to control the bottom liquid level of the cooling purification tower.

[0031] The top gas outlet of the cooling and purification tower is also equipped with a pressure control valve, which is used to regulate the pressure of the cooling and purification tower.

[0032] In one embodiment of the present invention, a perforated plate is further provided at the bottom of the cooling and purification tower. The perforated plate is used to enhance the contact and mass transfer between the top coal gas and the circulating cooling water, so that the circulating cooling water and the top coal gas can exchange heat for cooling and coarse washing.

[0033] A partition device is provided in the middle of the cooling and purification tower. The partition device is used to prevent the circulating softened water in the upper part of the cooling and purification tower from entering the circulating cooling water at the bottom of the cooling and purification tower.

[0034] The upper part of the cooling and purification tower is provided with a circulating softened water purification space. The circulating softened water purification space is used to use circulating softened water to perform fine washing again on the top coal gas after cooling and coarse washing, thereby reducing the dust and acidic impurity components in the top coal gas.

[0035] The top of the cooling and purification tower is equipped with a coalescing internal component, which is used to deliquinate the top coal gas after fine washing, thereby reducing the free water content in the top coal gas.

[0036] In one embodiment of the present invention, a second flow control valve is provided on the cooling water supply pipeline, the second flow control valve being used to control the outlet temperature of the top gas.

[0037] The present invention also provides a method for treating top gas, the method comprising the following steps:

[0038] Connect the top gas supply pipeline to the bottom inlet of the cooling and purification tower, and supply top gas to the cooling and purification tower through the top gas supply pipeline;

[0039] The cooling water supply pipe is connected to the middle inlet of the cooling and purification tower. Cooling water is supplied to the cooling and purification tower through the cooling water supply pipe, and the cooling water is used to exchange heat and cool the top coal gas after contacting the top coal gas.

[0040] The softened water supply pipeline is connected to the upper inlet of the cooling and purification tower. Purified water is supplied to the cooling and purification tower through the softened water supply pipeline, and the purified water is used to purify the top gas after heat exchange and cooling.

[0041] The top gas outlet of the cooling and purification tower is connected to the downstream pipeline of the purified top coal gas, so that the top coal gas that has undergone heat exchange, cooling and purification treatment is output to the outside.

[0042] The present invention also provides a blast furnace that produces top gas, the top gas being applied to a top gas treatment system as described above, or the top gas being applied to a top gas treatment method as described above.

[0043] As described above, the present invention provides a top gas treatment system and method, and a blast furnace, which has the following beneficial effects: The present invention can connect the top gas supply pipeline to the bottom inlet of the cooling and purification tower, and then supply top gas to the cooling and purification tower through the top gas supply pipeline; and connect the cooling water supply pipeline to the middle inlet of the cooling and purification tower, and supply cooling water to the cooling and purification tower through the cooling water supply pipeline, and the cooling water performs heat exchange and cooling on the top gas after contacting with the top gas; and connect the softened water supply pipeline to the upper inlet of the cooling and purification tower, and supply purified water to the cooling and purification tower through the softened water supply pipeline, and the purified water is used to purify the top gas after heat exchange and cooling; finally, connect the top gas outlet of the cooling and purification tower to the downstream conveying pipeline of the purified top gas, and output the top gas that has undergone heat exchange, cooling and purification treatment to the outside. Therefore, it can be seen that within the cooling and purification tower, cooling water and top coal gas can directly contact for heat exchange and cooling, while softened water and the cooled top coal gas can directly contact for washing and purification. Thus, this invention allows for two different top coal gas purification processes within the cooling and purification tower, essentially achieving simultaneous top coal gas cooling and dust removal within the same unit. Therefore, this invention not only reduces the content of acidic gas components in the top coal gas but also mitigates its corrosive effects on subsequent processes, thereby providing higher-quality feed gas and ensuring the safe and stable operation of subsequent process units. Furthermore, through a special design of the cooling and purification tower, this invention offers advantages in terms of investment, operating costs, and land area compared to indirect cooling solutions. Attached Figure Description

[0044] Figure 1 This is a connection diagram of a top gas treatment system provided in one embodiment of the present invention;

[0045] Figure 2 This is a schematic flowchart of a top gas treatment method provided in an embodiment of the present invention;

[0046] Figure 3 A schematic flowchart of a top gas treatment method provided in another embodiment of the present invention;

[0047] Figure 4 A schematic flowchart of a top gas treatment method provided in another embodiment of the present invention;

[0048] Figure 5 A schematic flowchart of a top gas treatment method provided in another embodiment of the present invention;

[0049] Figure 6 A schematic flowchart of a top gas treatment method provided in another embodiment of the present invention;

[0050] Explanation of reference numerals in the attached figures:

[0051] 1-Cooling and purification tower;

[0052] 2-Softened water circulating pump;

[0053] 3-Replenishment pump;

[0054] 4-Cooling water circulation pump;

[0055] 5-Self-cleaning filter;

[0056] 6-Cooling water pool;

[0057] 7-Cooling tower;

[0058] 8-Dosing device;

[0059] 9-Bypass filter;

[0060] 10-Bypass filter pump;

[0061] 11-Wastewater collection tank;

[0062] 12-Wastewater pump

[0063] 13-Top gas supply pipeline;

[0064] 14-Downstream transmission pipeline for purified top coal gas;

[0065] 15 - Cooling water supply pipe;

[0066] 16 - Softened water supply pipes;

[0067] 17- Softened water replenishment pipe;

[0068] 19 - Sampling port;

[0069] 20 - Wastewater discharge pipeline. Detailed Implementation

[0070] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0071] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0072] In one exemplary embodiment, such as Figure 1 As shown, Figure 1 A connection diagram of the top gas treatment system provided in this embodiment is shown. Specifically, this embodiment provides a top gas treatment system, including: a cooling and purification tower 1, a top gas supply pipeline 13, a cooling water supply pipeline 15, and a softened water supply pipeline 16. In this embodiment or other embodiments, the cooling and purification tower 1 can be sequentially provided with a top gas outlet, an upper inlet, a middle outlet, a middle inlet, a bottom inlet, and a bottom liquid outlet from top to bottom. That is, below the top gas outlet is the upper inlet, below the upper inlet is the middle outlet, below the middle outlet is the middle inlet, below the middle inlet is the bottom inlet, and below the bottom inlet is the bottom liquid outlet. Figure 1 As shown, the top of the cooling and purification tower 1 is the top gas outlet, the bottom of the cooling and purification tower 1 is the bottom liquid outlet, the left side of the cooling and purification tower 1 from top to bottom is the middle inlet and the bottom inlet, and the right side of the cooling and purification tower 1 from top to bottom is the upper inlet and the middle outlet.

[0073] Specifically, the top gas supply pipeline 13 is connected to the bottom inlet of the cooling and purification tower 1, and the top gas supply pipeline 13 is used to supply top gas to the cooling and purification tower 1. In this embodiment or other embodiments, the top gas can be generated by a blast furnace, such as the top gas generated by an oxygen blast furnace.

[0074] The cooling water supply pipe 15 is connected to the central inlet of the cooling and purification tower 1. The cooling water supply pipe 15 is used to supply cooling water to the cooling and purification tower 1. After the cooling water comes into contact with the top gas, it exchanges heat with the top gas and cools it down. Figure 1 As shown, in this embodiment or other embodiments, when the cooling water supply pipeline 15 supplies cooling water to the cooling purification tower 1 for the first time, it can supply circulating cooling water or uncirculated raw cooling water; when the cooling water supply pipeline 15 supplies cooling water to the cooling purification tower 1 for the second and subsequent times, it can supply circulating cooling water. In this embodiment or other embodiments, a second flow control valve can also be installed on the cooling water supply pipeline 15, which is used to control the outlet temperature of the top gas.

[0075] The softened water supply pipe 16 is connected to the upper inlet of the cooling and purification tower 1. The softened water supply pipe 16 is used to supply purified water to the cooling and purification tower 1, and the purified water is used to purify the top gas after heat exchange and cooling. Figure 1 As shown, in this embodiment or other embodiments, when the softened water supply pipe 16 supplies softened water to the cooling and purification tower 1 for the first time, it can supply circulating softened water or softened water that has not been circulated; when the softened water supply pipe 16 supplies softened water to the cooling and purification tower 1 for the second time and thereafter, it can supply circulating softened water or supplemented softened water.

[0076] The top gas outlet of the cooling and purification tower 1 is connected to the downstream pipeline 14 for the purified top coal gas, and is used to output the top coal gas that has undergone heat exchange, cooling and purification treatment to the outside.

[0077] Therefore, it can be seen that within the cooling and purification tower, cooling water and top coal gas can directly contact each other for heat exchange and cooling, while softened water and the cooled top coal gas can directly contact each other for washing and purification. Thus, this embodiment allows for two different top coal gas purification processes within the cooling and purification tower, essentially achieving simultaneous top coal gas cooling and dust removal within the same unit. Therefore, this embodiment not only reduces the content of acidic gas components in the top coal gas but also mitigates its corrosive effects on subsequent processes, thereby providing higher-quality feed gas for subsequent processes and ensuring the safe and stable operation of subsequent process units.

[0078] According to the above description, in an exemplary embodiment, the top gas treatment system may further include: a cooling tower 7, a cooling water tank 6, a cooling water circulation pump 4, and a self-cleaning filter 5. Specifically, the cooling tower 7 is connected to the bottom liquid outlet of the cooling purification tower 1, and the cooling tower 7 is used to cool the cooling water flowing out of the bottom liquid outlet and then use it as circulating cooling water for reuse; the cooling water tank 6 is connected to the cooling tower 7, and the cooling water tank 6 is used to store circulating cooling water for reuse; the cooling water circulation pump 4 is connected to the cooling water tank 6, and the cooling water circulation pump 4 is used to pressurize the circulating cooling water in the cooling water tank 6; the self-cleaning filter 5 is connected to the outlet of the cooling water circulation pump 4 and the inlet of the cooling water supply pipe 15, respectively, and the self-cleaning filter 5 is used to filter the circulating cooling water output by the cooling water circulation pump 4, and to supply the purified circulating cooling water to the cooling purification tower 1 through the cooling water supply pipe 15, and to discharge the wastewater generated during the filtration of the circulating cooling water to the wastewater collection tank 11. Therefore, this embodiment can utilize a cooling water tank to store circulating cooling water that needs to be recycled. At the same time, a cooling water circulation pump can be used to pressurize the circulating cooling water in the cooling water tank and then flow it out to a self-cleaning filter to filter the circulating cooling water. The purified circulating cooling water obtained after filtration is then passed through a cooling water supply pipeline to a cooling purification tower so that the purified circulating cooling water comes into contact with the top coal gas and exchanges heat to cool the top coal gas. The circulating cooling wastewater obtained during the filtration of the circulating cooling water is then discharged to a wastewater collection tank for storage.

[0079] According to the above description, in an exemplary embodiment, the top gas treatment system may further include: a softened water replenishment pipe 17, a replenishment pump 3, and a softened water circulation pump 2. Specifically, the softened water replenishment pipe 17 is connected to an external softened water network and is used to replenish softened water. The replenishment pump 3 is used to pressurize the replenished softened water; wherein, the inlet of the replenishment pump 3 is connected to the outlet of the softened water replenishment pipe 17, and the outlet of the replenishment pump 3 is connected to the inlet of the softened water supply pipe 16. The softened water circulation pump 2 is used to pressurize the softened water flowing out of the middle outlet of the cooling purification tower 1 and use it as circulating softened water for reuse; wherein, the inlet of the softened water circulation pump 2 is connected to the middle outlet of the cooling purification tower 1, and the outlet of the softened water circulation pump 2 is connected to the inlet of the softened water supply pipe 16 and the outlet of the replenishment pump 3, respectively. Therefore, when the softened water in the cooling purification tower is lost or discharged, this embodiment can replenish the softened water from the external softened water network through the softened water replenishment pipe 17. The replenished softened water is then pressurized by the replenishment pump 3 and flows through the outlet of the softened water supply pipe 16 to the cooling purification tower 1. This replenished softened water can then be used to purify the top gas after heat exchange and cooling. Simultaneously, the softened water flowing out of the middle outlet of the cooling purification tower 1 is pressurized by the softened water circulation pump 2 and used as circulating softened water for reuse, flowing to the inlet of the softened water supply pipe 16. This circulating softened water can then be used to purify the top gas after heat exchange and cooling.

[0080] According to the above description, in an exemplary embodiment, the top gas treatment system may further include: a first flow control valve, a wastewater discharge pipe 20, and a sampling port 19. Specifically, the first flow control valve is connected to the softened water supply pipe 16 and is used to control the softened water circulation flow rate; the wastewater discharge pipe 20 is connected to the softened water circulation pump 2 and is used to discharge softened wastewater; the sampling port 19 is connected to the wastewater discharge pipe 20 and is used by external personnel to collect circulating softened wastewater samples, which are used to analyze the impurity content in the circulating softened water. In this embodiment or other embodiments, the external personnel may be staff members analyzing the impurity content in the circulating softened water, or personnel sampling the circulating softened wastewater. Figure 1 As shown, in this embodiment, the outlet of the wastewater discharge pipe 20 can be located between the bottom liquid outlet of the cooling tower 7 and the cooling purification tower 1, so that the softened wastewater discharged from the wastewater discharge pipe 20 can flow into the cooling tower 7.

[0081] According to the above description, in an exemplary embodiment, the cooling water tank 6 may further include: a dosing device 8, a bypass filter 9, and a bypass pump 10. Specifically, the bypass pump 10 is connected to the cooling water tank 6, the bypass filter 9, and the wastewater collection tank 11, respectively. The bypass pump 10 is used to pressurize the circulating cooling water in the cooling water tank 6 and discharge it to the bypass filter 9 and the wastewater collection tank 11, respectively. The bypass filter 9 is used to remove impurities and dust from the circulating cooling water and discharge the purified circulating cooling water to the cooling water tank 6, and discharge the wastewater generated during the purification of the circulating cooling water to the wastewater collection tank 11. The dosing device 8 is connected to the cooling water tank 6 and is used to add chemicals to the cooling water tank 6 to improve the water quality in the cooling water tank 6. In this embodiment or other embodiments, when adding chemicals to the cooling water tank 6, the dosing device 8 can automatically add chemicals according to a preset program at regular intervals, or it can manually add chemicals at regular or irregular intervals. The chemicals added by the dosing device 8 are mainly used to improve the water quality in the cooling water tank 6. Therefore, the type and dosage of the chemicals can be set according to specific circumstances. This embodiment does not make specific limitations here.

[0082] According to the above description, in an exemplary embodiment, the top gas treatment system may further include: a wastewater pump 12, connected to a wastewater collection tank 11, for pressurizing the wastewater in the wastewater collection tank 11 and allowing it to flow out to an external production wastewater network. Furthermore, in order to maintain the liquid level in the cooling water tank, the amount of cooling water in the cooling water tank can be replenished according to the wastewater discharge volume flowing out to the external production wastewater network.

[0083] According to the above description, in an exemplary embodiment, the bottom liquid outlet of the cooling purification tower 1 is also connected to a circulating cooling water drainage pipe, and the circulating cooling water drainage pipe is equipped with a liquid level control valve, which is used to control the bottom liquid level of the cooling purification tower 1 to prevent the top gas from leaking out; the top gas outlet of the cooling purification tower 1 is also equipped with a pressure control valve, which is used to adjust the pressure of the cooling purification tower 1.

[0084] According to the above description, in an exemplary embodiment, the bottom of the cooling and purification tower 1 is further provided with a perforated plate, which is used to enhance the contact and mass transfer between the top coal gas and the circulating cooling water, so that the circulating cooling water and the top coal gas can exchange heat for cooling and coarse washing; the middle part of the cooling and purification tower 1 is provided with a partition device, which is used to prevent the circulating softened water in the upper part of the cooling and purification tower 1 from entering the circulating cooling water at the bottom of the cooling and purification tower 1, but does not affect the smooth passage of the top coal gas and the airflow distribution; the upper part of the cooling and purification tower 1 is provided with a circulating softened water purification space, which is used for circulating softened water to perform fine washing on the top coal gas after cooling and coarse washing, reducing the dust and acidic impurity components in the top coal gas; the top of the cooling and purification tower 1 is provided with a coalescence internal component, which is used to deliquify the finely washed top coal gas, reducing the free water content in the top coal gas. In this embodiment or other embodiments, the cooling and purification tower 1 can be structurally arranged from top to bottom as a top, upper part, middle part, and bottom. That is, the top of the cooling and purification tower 1 is located above the upper part of the cooling and purification tower 1, the upper part of the cooling and purification tower 1 is located above the middle part of the cooling and purification tower 1, and the middle part of the cooling and purification tower 1 is located above the bottom of the cooling and purification tower 1. Specifically, the top coal gas generated by the dust removal system of the upstream unit is transported to the bottom inlet of the cooling and purification tower 1 through the top coal gas supply pipeline 13, and the top coal gas enters the cooling and purification tower 1. The top coal gas entering the cooling and purification tower 1 undergoes counter-current heat exchange and coarse washing on the perforated tower plate with cooling water entering from the middle inlet of the cooling and purification tower 1. Simultaneously, due to the partition device installed in the middle of the cooling and purification tower 1, the circulating softened water and circulating cooling water cannot enter each other's spaces. Since the partition device does not affect the smooth passage and airflow distribution of the top coal gas, the cooled and coarsely washed top coal gas is further finely washed by counter-currently injected circulating softened water in the circulating softened water purification space. Finally, the finely washed top coal gas passes through the coalescing internals at the top of the cooling and purification tower 1 to remove free water, and then flows out from the top gas outlet of the cooling and purification tower 1 to the downstream conveying pipeline 14, thereby being sent to downstream processes or downstream devices. Therefore, it can be seen that, through the special design of the cooling and purification tower, this embodiment provides a direct cooling solution for top coal gas that has advantages in terms of investment, operating costs, and land area compared to the indirect cooling scheme.

[0085] According to the above description, in a specific example, this example uses 450,000 Nm 3 Based on the top coal gas per hour, the specific parameters of the top coal gas are shown in Table 1 below.

[0086] Table 1 Specific parameters of top gas

[0087]

[0088] When the top coal gas enters the cooling and purification tower 1, it is cooled by direct contact with circulating cooling water, reducing the temperature from 120°C to approximately 40°C. Cooling tower 7 then cools the circulating cooling water from 60°C to approximately 30°C. After treatment in cooling and purification tower 1, the chloride ion content at the outlet is 5 mg / Nm³. 3 The removal efficiency reached 95.0%, and the outlet dust content was reduced to 2 mg / Nm³. 3 The parameters of each device under operating conditions 1 and 2 are shown in Tables 2 and 3.

[0089] Table 2 Equipment parameters under operating condition 1

[0090] Serial Number Equipment Name type <![CDATA[Operating flow rate m 3 / h]]> Shaft power kW 1 Cooling water circulation pump (4) centrifugal pump 700 180 2 Softened water circulation pump (2) centrifugal pump 100 15 3 Softened water replenishment pump (3) reciprocating pump 10 7 4 Cooling tower fan 50

[0091] Table 3 Equipment parameters under operating condition 2

[0092] Serial Number Equipment Name type <![CDATA[Operating flow rate m 3 / h]]> Shaft power kW 1 Cooling water circulation pump (4) centrifugal pump 1200 300 2 Softened water circulation pump (2) centrifugal pump 100 15 3 Softened water replenishment pump (3) reciprocating pump 10 7 4 Cooling tower fan 85

[0093] The results of the purified top coal gas after being treated by cooling and purification tower 1 are shown in Table 4.

[0094] Table 4. Test results of purified top gas

[0095]

[0096] Since the circulating top gas contains saturated water vapor, after the circulating top gas undergoes the cooling process, water will be released at a rate of 15.7 t / h (condition 1) and 45.4 t / h (condition 2). This amount of water can offset the amount of water vapor evaporated by the cooling tower under higher temperature operation. Therefore, the cooling tower does not need to be replenished with a large amount of production water under higher temperature operation conditions.

[0097] In summary, this invention provides a top coal gas treatment system that connects a top coal gas supply pipeline to the bottom inlet of a cooling and purification tower, supplying top coal gas to the tower via the same pipeline; connects a cooling water supply pipeline to the middle inlet of the cooling and purification tower, supplying cooling water to the tower via the same pipeline, where the cooling water contacts the top coal gas and performs heat exchange and cooling; connects a softened water supply pipeline to the upper inlet of the cooling and purification tower, supplying purified water to the tower via the same pipeline, where the purified water is used to purify the top coal gas after heat exchange and cooling; and finally connects the top gas outlet of the cooling and purification tower to a downstream pipeline for transporting the purified top coal gas, outputting the heat-cooled and purified top coal gas to the outside. Therefore, it can be seen that within the cooling and purification tower, cooling water and top coal gas can directly contact for heat exchange and cooling, while softened water and the cooled top coal gas can directly contact for washing and purification. Thus, this system can perform two different top coal gas purification processes within the cooling and purification tower, essentially achieving simultaneous cooling and dust removal of the top coal gas within the same unit. Therefore, this system not only reduces the content of acidic gas components in the top coal gas but also mitigates its corrosive effects on subsequent processes, providing higher-quality feed gas and ensuring the safe and stable operation of subsequent process units. Furthermore, through a specially designed cooling and purification tower, this system offers advantages in terms of investment, operating costs, and land area compared to indirect cooling solutions. Therefore, this system can simultaneously cool and purify circulating top coal gas, not only lowering the gas temperature to meet subsequent process requirements but also simultaneously reducing dust and acidic gas components in the circulating top coal gas, thereby reducing the likelihood of blockage, corrosion, and malfunctions in subsequent equipment due to impurities in the circulating top coal gas. Meanwhile, by utilizing the direct contact heat exchange between the circulating top gas and cooling water, the efficiency is higher than that of the indirect heat exchange method, reducing the amount of circulating cooling water used, reducing the energy consumption of the unit, and improving energy utilization efficiency.

[0098] In another exemplary embodiment of the present invention, such as Figure 2 As shown, Figure 2 A schematic flowchart of the top gas treatment method provided in this embodiment is shown. Specifically, this embodiment provides a top gas treatment method, which includes the following steps:

[0099] S210, connect the top gas supply pipeline to the bottom inlet of the cooling and purification tower, and supply top gas to the cooling and purification tower through the top gas supply pipeline. In this embodiment or other embodiments, the top gas can be generated by a blast furnace, such as the top gas generated by an oxygen blast furnace.

[0100] S220 connects the cooling water supply pipeline to the central inlet of the cooling and purification tower, supplying cooling water to the tower and utilizing the cooling water to exchange heat and cool the top gas after contact with it. Figure 1 As shown, in this embodiment or other embodiments, when the cooling water supply pipeline supplies cooling water to the cooling purification tower for the first time, it can supply circulating cooling water or raw cooling water that has not undergone circulation; when the cooling water supply pipeline supplies cooling water to the cooling purification tower for the second and subsequent times, it can supply circulating cooling water. In this embodiment or other embodiments, a second flow control valve can also be installed on the cooling water supply pipeline, which is used to control the outlet temperature of the top gas.

[0101] S230 connects the softened water supply pipeline to the upper inlet of the cooling and purification tower, supplying purified water to the tower and using it to purify the top gas after heat exchange and cooling. For example... Figure 1 As shown in this embodiment or other embodiments, when the softened water supply pipeline supplies softened water to the cooling and purification tower for the first time, it can supply circulating softened water or softened water that has not been circulated; when the softened water supply pipeline supplies softened water to the cooling and purification tower for the second time and thereafter, it can supply circulating softened water or supplementary softened water.

[0102] S240 connects the top gas outlet of the cooling and purification tower to the downstream pipeline of the purified top coal gas, and outputs the top coal gas that has undergone heat exchange, cooling and purification treatment to the outside.

[0103] Therefore, it can be seen that within the cooling and purification tower, cooling water and top coal gas can directly contact each other for heat exchange and cooling, while softened water and the cooled top coal gas can directly contact each other for washing and purification. Thus, this embodiment allows for two different top coal gas purification processes within the cooling and purification tower, essentially achieving simultaneous top coal gas cooling and dust removal within the same unit. Therefore, this embodiment not only reduces the content of acidic gas components in the top coal gas but also mitigates its corrosive effects on subsequent processes, thereby providing higher-quality feed gas for subsequent processes and ensuring the safe and stable operation of subsequent process units.

[0104] According to the above records, such as Figure 3 As shown, in an exemplary embodiment, the top gas treatment method may further include the following steps:

[0105] S310 connects the bottom liquid outlet of the cooling tower to the cooling purification tower. The cooling water flowing out of the bottom liquid outlet is cooled by the cooling tower and then used as circulating cooling water for reuse.

[0106] S320 connects the cooling water pool to the cooling tower, and stores circulating cooling water in the cooling water pool for recycling.

[0107] S330 connects the cooling water circulation pump to the cooling water pool, and pressurizes the circulating cooling water in the cooling water pool through the cooling water circulation pump;

[0108] S340 connects the self-cleaning filter to the outlet of the cooling water circulation pump and the inlet of the cooling water supply pipe. The self-cleaning filter filters the circulating cooling water output by the cooling water circulation pump and supplies the purified circulating cooling water to the cooling purification tower through the cooling water supply pipe. The wastewater generated during the filtration of the circulating cooling water flows out to the wastewater collection tank.

[0109] Therefore, this embodiment can utilize a cooling water tank to store circulating cooling water that needs to be recycled. At the same time, a cooling water circulation pump can be used to pressurize the circulating cooling water in the cooling water tank and then flow it out to a self-cleaning filter to filter the circulating cooling water. The purified circulating cooling water obtained after filtration is then passed through a cooling water supply pipeline to a cooling purification tower so that the purified circulating cooling water comes into contact with the top coal gas and exchanges heat to cool the top coal gas. The circulating cooling wastewater obtained during the filtration of the circulating cooling water is then discharged to a wastewater collection tank for storage.

[0110] According to the above records, such as Figure 4 As shown, in an exemplary embodiment, the top gas treatment method may further include the following steps:

[0111] S410 connects the softened water replenishment pipe to the external softened water network and replenishes softened water through the softened water replenishment pipe;

[0112] S420 connects the inlet of the replenishment pump to the outlet of the softened water replenishment pipeline and connects the outlet of the replenishment pump to the inlet of the softened water supply pipeline, and pressurizes the replenished softened water through the replenishment pump.

[0113] S430 connects the inlet of the softened water circulation pump to the outlet of the middle section of the cooling purification tower, and connects the outlet of the softened water circulation pump to the inlet of the softened water supply pipeline and the outlet of the replenishment pump, respectively. The softened water flowing out of the middle section of the cooling purification tower is pressurized by the softened water circulation pump and then used as circulating softened water for reuse.

[0114] Therefore, in this embodiment, when softened water is lost or discharged from the cooling purification tower, it can be replenished from an external softened water network via a softened water replenishment pipe. The replenished softened water is then pressurized by a replenishment pump and flows through the outlet of the softened water supply pipe to the cooling purification tower, thus allowing the replenished softened water to purify the top gas after heat exchange and cooling. Simultaneously, the softened water flowing out of the middle outlet of the cooling purification tower is pressurized by a softened water circulation pump and used as circulating softened water for reuse, flowing to the inlet of the softened water supply pipe, thus allowing the circulating softened water to purify the top gas after heat exchange and cooling.

[0115] According to the above records, such as Figure 5 As shown, in an exemplary embodiment, the top gas treatment method may further include the following steps:

[0116] S510 connects the first flow control valve to the softened water supply pipeline and controls the softened water circulation flow through the first flow control valve;

[0117] S520, the wastewater discharge pipe is connected to the softened water circulation pump, and softened wastewater is discharged through the wastewater discharge pipe; and a sampling port is connected to the wastewater discharge pipe, and a sample of the circulating softened wastewater is collected through the sampling port. The circulating softened wastewater sample is used to analyze the impurity content in the circulating softened water. In this embodiment or other embodiments, external personnel can be staff members analyzing the impurity content in the circulating softened water, or personnel sampling the circulating softened wastewater. In this embodiment, the outlet of the wastewater discharge pipe can be located between the bottom liquid outlet of the cooling tower and the cooling purification tower, so that the softened wastewater discharged from the wastewater discharge pipe can flow into the cooling tower.

[0118] According to the above records, such as Figure 6 As shown, in an exemplary embodiment, if the cooling water tank in the above embodiment includes: a dosing device, a bypass filter, and a bypass pump; then the top gas treatment method may further include the following steps:

[0119] S610 connects the bypass pump to the cooling water tank, bypass filter, and wastewater collection tank respectively. The bypass pump pressurizes the circulating cooling water in the cooling water tank and then the pressurized circulating cooling water flows out to the bypass filter and wastewater collection tank respectively.

[0120] The S620 removes impurities and dust from the circulating cooling water through a bypass filter, and discharges the purified circulating cooling water to the cooling water pool, as well as discharges the wastewater generated during the purification of the circulating cooling water to the wastewater collection pool.

[0121] S630 connects a wastewater pump to a wastewater collection tank, pressurizing the wastewater in the collection tank before it flows out to the external production wastewater network. Furthermore, to maintain the cooling water level in the cooling water tank, the amount of cooling water in the tank can be replenished based on the volume of wastewater discharged into the external production wastewater network.

[0122] This embodiment can also connect the dosing device to the cooling water tank, adding chemicals to the cooling water tank through the dosing device to improve the water quality. In this embodiment or other embodiments, when adding chemicals to the cooling water tank, the dosing device can automatically add chemicals according to a preset program at regular intervals, or it can manually add chemicals at regular or irregular intervals. The chemicals added by the dosing device are mainly used to improve the water quality in the cooling water tank, so the type and dosage of the chemicals can be set according to specific circumstances, and this embodiment does not impose specific limitations.

[0123] According to the above description, in an exemplary embodiment, if the bottom liquid outlet of the cooling purification tower is also connected to a circulating cooling water drainage pipe, the top gas treatment method may further include the following steps: setting a liquid level control valve in the circulating cooling water drainage pipe and controlling the bottom liquid level of the cooling purification tower through the liquid level control valve to prevent the top gas from leaking out; and setting a pressure control valve at the top gas outlet of the cooling purification tower and adjusting the pressure of the cooling purification tower through the pressure control valve.

[0124] According to the above description, in an exemplary embodiment, the top gas treatment method may further include the following steps: a perforated plate is provided at the bottom of the cooling and purification tower to enhance the contact and mass transfer between the top gas and the circulating cooling water, so that the circulating cooling water and the top gas can exchange heat for cooling and coarse washing; a partition device is provided in the middle of the cooling and purification tower to prevent the circulating softened water in the upper part of the cooling and purification tower from entering the circulating cooling water at the bottom of the cooling and purification tower, without affecting the smooth passage and airflow distribution of the top gas; a circulating softened water purification space is provided in the upper part of the cooling and purification tower, where the circulating softened water further washes the cooled and coarsely washed top gas to reduce the dust and acidic impurity components in the top gas; and a coalescing internal is provided at the top of the cooling and purification tower to deliquify the finely washed top gas and reduce the free water content in the top gas. In this embodiment or other embodiments, the top-to-bottom structural layout of the cooling and purification tower can be top, upper, middle, and bottom, respectively. That is, the top of the cooling and purification tower is located above the upper part of the cooling and purification tower, the upper part of the cooling and purification tower is located above the middle part of the cooling and purification tower, and the middle part of the cooling and purification tower is located above the bottom of the cooling and purification tower. Specifically, the top coal gas generated by the dust removal system of the upstream unit is transported to the bottom inlet of the cooling and purification tower through the top coal gas supply pipeline, and the top coal gas enters the cooling and purification tower. The top gas entering the cooling and purification tower undergoes counter-current heat exchange and coarse washing on the perforated tower plate with cooling water entering from the middle inlet of the tower. Simultaneously, due to the partition device in the middle of the cooling and purification tower, the circulating softened water and circulating cooling water cannot enter each other's spaces. This partition device does not affect the smooth passage and airflow distribution of the top gas. Therefore, the cooled and coarsely washed top gas undergoes further fine washing in the circulating softened water purification space by counter-current injection of circulating softened water. Finally, after fine washing, the top gas passes through the coalescing internals at the top of the cooling and purification tower to remove free water, and then flows out from the top gas outlet of the cooling and purification tower to the downstream pipeline for transporting purified top gas. From there, it can be seen that, through the special design of the cooling and purification tower, this embodiment provides a direct top gas cooling solution with advantages in terms of investment, operating costs, and land area compared to the indirect cooling solution.

[0125] In summary, this invention provides a method for treating top coal gas. The method involves connecting a top coal gas supply pipeline to the bottom inlet of a cooling and purification tower, supplying top coal gas to the tower via the same pipeline; connecting a cooling water supply pipeline to the middle inlet of the cooling and purification tower, supplying cooling water to the tower via the same pipeline, and allowing the cooling water to exchange heat with and cool the top coal gas; connecting a softened water supply pipeline to the upper inlet of the cooling and purification tower, supplying purified water to the tower via the same pipeline, and using the purified water to purify the top coal gas after heat exchange and cooling; and finally connecting the top gas outlet of the cooling and purification tower to a downstream pipeline for transporting the purified top coal gas, thus outputting the heat-cooled and purified top coal gas to the outside. Therefore, it can be seen that within the cooling and purification tower, cooling water and top coal gas can directly contact for heat exchange and cooling, while softened water and the cooled top coal gas can directly contact for washing and purification. Thus, this method allows for two different top coal gas purification processes within the cooling and purification tower, essentially achieving simultaneous cooling and dust removal of the top coal gas within the same unit. This method not only reduces the content of acidic gas components in the top coal gas but also mitigates its corrosive effects on subsequent processes, providing higher-quality feed gas and ensuring the safe and stable operation of downstream processes. Furthermore, through a specially designed cooling and purification tower, this method offers advantages in terms of investment, operating costs, and land area compared to indirect cooling solutions. Therefore, this method can simultaneously cool and purify circulating top coal gas, not only lowering the gas temperature to meet subsequent process requirements but also reducing dust and acidic gas components in the circulating top coal gas, thereby reducing the likelihood of blockage, corrosion, and malfunctions in downstream equipment due to impurities in the circulating top coal gas. Meanwhile, by utilizing the direct contact heat exchange between the circulating top gas and cooling water, the efficiency is higher than that of the indirect heat exchange method, reducing the amount of circulating cooling water used, reducing the energy consumption of the unit, and improving energy utilization efficiency.

[0126] It should be noted that the top gas treatment method provided in the above embodiments and the top gas treatment system provided in the above embodiments belong to the same concept. The specific way in which the top gas treatment system performs its operation has been described in detail in the above system embodiments and will not be repeated here. In practical applications, the top gas treatment method provided in the above embodiments can be assigned to different functional modules as needed. That is, the internal structure of the top gas treatment method can be divided into different functional modules, and then all or part of the functions of the corresponding functional modules can be implemented through the top gas treatment system described in the above embodiments. No specific limitations are imposed here.

[0127] In another exemplary embodiment of the present invention, this embodiment also provides a blast furnace capable of producing top gas as described in the above embodiments. This top gas can be applied to the top gas method and / or top gas treatment system as described in the above embodiments. Since the specific manner in which the top gas treatment system and the top gas method are executed has been described in detail in the above embodiments, the technical functions and effects of the blast furnace provided in this embodiment can be referred to in the above embodiments, and will not be repeated here.

[0128] It should be understood that although the terms "first," "second," etc., may be used to describe flow control valves in the embodiments of the present invention, these terms are only used to distinguish flow control valves from one another. For example, without departing from the scope of the embodiments of the present invention, a first flow control valve may also be referred to as a second flow control valve, and similarly, a second flow control valve may also be referred to as a first flow control valve.

[0129] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A top gas treatment system, characterized in that, The system includes: Cooling and purification tower (1); The top gas supply pipeline (13) is connected to the bottom inlet of the cooling and purification tower (1) and is used to supply top gas to the cooling and purification tower (1); The cooling water supply pipe (15) is connected to the middle inlet of the cooling purification tower (1) and is used to supply cooling water to the cooling purification tower (1). The cooling water exchanges heat and cools the top coal gas after contacting the top coal gas. The softened water supply pipe (16) is connected to the upper inlet of the cooling and purification tower (1) and is used to supply purified water to the cooling and purification tower (1). The purified water is used to purify the top gas after heat exchange and cooling. The top gas outlet of the cooling and purification tower (1) is connected to the downstream pipeline (14) for the purification of top coal gas, and is used to output the top coal gas that has been cooled and purified to the outside. The bottom of the cooling and purification tower (1) is also provided with a perforated tower plate, which is used to enhance the contact and mass transfer between the top coal gas and the circulating cooling water, so that the circulating cooling water and the top coal gas can exchange heat for cooling and coarse washing. A partition device is provided in the middle of the cooling purification tower (1). The partition device is used to prevent the circulating softened water in the upper part of the cooling purification tower (1) from entering the circulating cooling water at the bottom of the cooling purification tower (1). The upper part of the cooling and purification tower (1) is provided with a circulating softened water purification space. The circulating softened water purification space is used to use circulating softened water to perform fine washing again on the top coal gas after cooling and coarse washing, thereby reducing the dust and acidic impurity components in the top coal gas. The top of the cooling and purification tower (1) is provided with a coalescing internal component, which is used to deliquinate the top coal gas after fine washing and reduce the free water content in the top coal gas.

2. The top gas treatment system according to claim 1, characterized in that, The system also includes: The cooling tower (7) is connected to the bottom liquid outlet of the cooling and purification tower (1) and is used to cool the cooling water flowing out of the bottom liquid outlet and then use it as circulating cooling water for reuse. The cooling water pool (6) is connected to the cooling tower (7) and is used to store circulating cooling water for recycling. A cooling water circulation pump (4) is connected to the cooling water pool (6) and is used to pressurize the circulating cooling water; The self-cleaning filter (5) is connected to the outlet of the cooling water circulation pump (4) and the inlet of the cooling water supply pipe (15). It is used to filter the circulating cooling water output by the cooling water circulation pump (4), and to supply the purified circulating cooling water to the cooling purification tower (1) through the cooling water supply pipe (15). It also discharges the wastewater generated during the filtration of the circulating cooling water to the wastewater collection tank (11).

3. The top gas treatment system according to claim 1 or 2, characterized in that, The system also includes: The softened water replenishment pipe (17) is connected to the external softened water network and is used to replenish softened water; A replenishment pump (3) is used to pressurize the replenished softened water. The inlet of the replenishment pump (3) is connected to the outlet of the softened water replenishment pipe (17), and the outlet of the replenishment pump (3) is connected to the inlet of the softened water supply pipe (16). The softened water circulation pump (2) is used to pressurize the softened water flowing out of the middle outlet of the cooling purification tower (1) and then use it as circulating softened water for reuse. The inlet of the softened water circulation pump (2) is connected to the middle outlet of the cooling purification tower (1), and the outlet of the softened water circulation pump (2) is connected to the inlet of the softened water supply pipe (16) and the outlet of the replenishment pump (3), respectively.

4. The top gas treatment system according to claim 3, characterized in that, The system also includes: The first flow control valve is connected to the softened water supply pipeline (16) and is used to control the softened water circulation flow rate; Wastewater discharge pipe (20) is connected to the softened water circulation pump (2) and is used to discharge softened wastewater; The sampling port (19) is connected to the wastewater discharge pipe (20) and is used by external personnel to collect circulating softened wastewater samples. The circulating softened wastewater samples are used to analyze the impurity content in the circulating softened water.

5. The top gas treatment system according to claim 2, characterized in that, The cooling water pool (6) is also equipped with: A bypass pump (10) is connected to the cooling water tank (6), the bypass filter (9), and the wastewater collection tank (11) respectively, and is used to pressurize the circulating cooling water in the cooling water tank (6) and flow out to the bypass filter (9) and the wastewater collection tank (11) respectively. The bypass filter (9) is used to remove impurities and dust from the circulating cooling water and to discharge the purified circulating cooling water to the cooling water pool (6) and to discharge the wastewater generated during the purification of the circulating cooling water to the wastewater collection pool (11). The dosing device (8) is connected to the cooling water tank (6) and is used to add chemicals to the cooling water tank (6).

6. The top gas treatment system according to claim 5, characterized in that, The system also includes: Wastewater pump (12) is connected to the wastewater collection tank (11) and is used to pressurize the wastewater in the wastewater collection tank (11) and allow it to flow out to the external production wastewater pipeline network.

7. The top gas treatment system according to claim 2, characterized in that, The bottom liquid outlet of the cooling purification tower (1) is also connected to a circulating cooling water drainage pipe. The circulating cooling water drainage pipe is equipped with a liquid level control valve, which is used to control the bottom liquid level of the cooling purification tower (1). The top gas outlet of the cooling purification tower (1) is also equipped with a pressure control valve, which is used to regulate the pressure of the cooling purification tower (1).

8. The top gas treatment system according to claim 1, characterized in that, A second flow control valve is installed on the cooling water supply pipeline (15), which is used to control the outlet temperature of the top coal gas.

9. A method for treating top coal gas, characterized in that, The method includes the following steps: Connect the top gas supply pipeline to the bottom inlet of the cooling and purification tower, and supply top gas to the cooling and purification tower through the top gas supply pipeline; The cooling water supply pipe is connected to the middle inlet of the cooling and purification tower. Cooling water is supplied to the cooling and purification tower through the cooling water supply pipe, and the cooling water is used to exchange heat and cool the top coal gas after contacting the top coal gas. The softened water supply pipeline is connected to the upper inlet of the cooling and purification tower. Purified water is supplied to the cooling and purification tower through the softened water supply pipeline, and the purified water is used to purify the top gas after heat exchange and cooling. The top gas outlet of the cooling and purification tower is connected to the downstream pipeline of the purified top coal gas, and the top coal gas that has undergone heat exchange, cooling and purification is output to the outside. Furthermore, a perforated plate is installed at the bottom of the cooling and purification tower to enhance the contact and mass transfer between the top coal gas and the circulating cooling water, thereby enabling the circulating cooling water to exchange heat and cool down the top coal gas, and to perform coarse washing. Additionally, a partition device is installed in the middle of the cooling and purification tower to prevent the circulating softened water in the upper part of the tower from entering the circulating cooling water at the bottom, without affecting the smooth passage and airflow distribution of the top coal gas. Furthermore, a circulating softened water purification space is installed at the top of the cooling and purification tower, where the circulating softened water further refines the cooled and coarsely washed top coal gas, reducing the dust and acidic impurities in the top coal gas. Finally, a coalescing internal device is installed at the top of the cooling and purification tower to deliquify the finely washed top coal gas, reducing the free water content in the top coal gas.

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