Top gas treatment system and method and blast furnace

Abstract

The invention provides a top gas treatment system and method and a blast furnace. The method comprises the steps that top gas is supplied to a cooling and purifying tower through a top gas supply pipeline, cooling water is supplied to the cooling and purifying tower through a cooling water supply pipeline, and the cooling water is in contact with the top gas to conduct heat exchange and cooling on the top gas; purified water is supplied to the cooling and purifying tower through a softened water supply pipeline, and the purified water is used for purifying the top gas subjected to heat exchange and cooling; and communicating a top gas outlet of the cooling purification tower with a purified top gas downstream conveying pipeline, and outputting the top gas subjected to heat exchange cooling and purification treatment to the outside. In the cooling purification tower, cooling water can be in direct contact with the top gas for heat exchange and cooling, and softened water can be in direct contact with the top gas subjected to heat exchange and cooling for washing and purification; therefore, two different top gas purification processes can be carried out in the cooling purification tower, which means that cooling and dust removal of the top gas can be simultaneously realized in the same set of device.

Description

Technical Field

[0001] The invention relates to the technical field of gas processing and steel smelting, and in particular to a top gas processing system and method, and a blast furnace. Background Art

[0002] At present, 90% of my country's steel industry adopts the long-process production process of blast furnace converter, while the short-process process of vertical furnace + electric furnace accounts for a relatively low proportion. At the same time, under the current energy situation, one of the main fossil energy sources of the steel industry is coal. In this case, the transformation technology from carbon to hydrogen or other energy sources is difficult and costly. Therefore, the steel industry can only improve the utilization efficiency of existing coal gas resources and gradually optimize the energy structure as the main technical direction of the low-carbon transformation of the steel industry. Therefore, the chemical utilization of coal gas has received more and more attention. Since the top gas of conventional blast furnaces contains about 50% nitrogen, the separation cost of nitrogen and CO is high, and the process is also complicated, so the oxygen blast furnace came into being. Therefore, the top gas of the oxygen blast furnace can be pressurized and decarbonized and then sprayed into the blast furnace as a reducing medium.

[0003] In addition to the main components such as CO, CO2, H2O, N2, and H2, the blast furnace top gas also contains trace amounts of sulfides (H2S, COS, CS2), chlorides (HCl, NH4Cl), and dust. Since the top gas temperature is relatively high, in order to meet the subsequent process requirements, the top gas needs to be cooled. In addition, the top gas contains impurities such as water vapor and HCl. During the cooling process, the top gas will continuously precipitate condensed water, and the impurity component HCl in the top gas will dissolve in water to form an acidic environment. The HCl aqueous solution will continuously corrode the equipment. Therefore, the top gas needs to be pretreated before entering the downstream process to prevent the impurity components contained in the top gas from corroding and clogging the equipment, causing equipment failures and other problems. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a top gas processing system and method, and a blast furnace, which are used to solve the problems in the prior art that impurity components contained in top gas corrode and block equipment, causing equipment failure, etc.

[0005] In order to achieve the above-mentioned object and other related objects, the present invention provides a top gas processing 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, connected to the middle inlet of the cooling and purification tower, for supplying cooling water to the cooling and purification tower, and utilizing the cooling water to contact the top gas to perform heat exchange and cooling on the top gas;

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

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

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

[0012] A cooling tower, connected to the bottom liquid outlet of the cooling and purification tower, is used to cool the cooling water flowing out of the bottom liquid outlet and use it as circulating cooling water for re-circulation;

[0013] A cooling water pool, connected to the cooling tower, for storing circulating cooling water for cyclic use;

[0014] A cooling water circulation pump, connected to the cooling water tank, for pressurizing 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, and is used for filtering the circulating cooling water output by the cooling water circulation pump, and supplying the purified circulating cooling water to the cooling purification tower through the cooling water supply pipe, and discharging the wastewater generated when filtering the circulating cooling water to the wastewater collection tank.

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

[0017] A softened water replenishment pipeline is connected to an external softened water network and is used to replenish softened water;

[0018] A replenishment pump, used for pressurizing the supplemented softened water, wherein 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 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 respectively connected to the inlet of the softened water supply pipeline and the outlet of the liquid replenishment pump.

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

[0021] A first flow control valve, connected to the softened water supply pipeline, for controlling the circulation flow of softened water;

[0022] A wastewater discharge pipeline, connected to the softened water circulation pump, for discharging softened wastewater;

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

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

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

[0026] A bypass filter is used to remove impurities and dust in the circulating cooling water, and to flow the purified circulating cooling water to the cooling water pool, and to flow the wastewater generated when purifying the circulating cooling water to the wastewater collection pool;

[0027] A dosing device is connected to the cooling water pool and is used to add medicine to the cooling water pool.

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

[0029] The wastewater pump is connected to the wastewater collection tank and is used to pressurize the wastewater in the wastewater collection tank and then flow it out to the external production wastewater network.

[0030] In one embodiment of the present invention, the bottom liquid outlet of the cooling and purification tower is also connected to a circulating cooling water drainage pipeline, and the circulating cooling water drainage pipeline is provided with a liquid level control valve, and the liquid level control valve is used to control the bottom liquid level of the cooling and purification tower;

[0031] A pressure control valve is also provided at the top gas outlet of the cooling and purification tower, and the pressure control valve is used to adjust the pressure of the cooling and purification tower.

[0032] In one embodiment of the present invention, a sieve hole tray is further provided at the bottom of the cooling and purification tower, and the sieve hole tray is used 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 be heat exchanged, cooled and roughly washed;

[0033] A partition device is provided in the middle of the cooling and purification tower, and the partition device is used to prevent the circulating softened water at 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, and the circulating softened water purification space is used to circulate softened water to perform fine washing again on the top gas that has been cooled and roughly washed, so as to reduce the dust acid impurity components in the top gas;

[0035] The top of the cooling and purification tower is provided with a coalescing internal component, and the coalescing internal component is used to carry out a liquid removal treatment on the top gas after fine washing, so as to reduce the free water content in the top gas.

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

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

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

[0039] Connecting a cooling water supply pipeline with the middle inlet of the cooling purification tower, supplying cooling water to the cooling purification tower through the cooling water supply pipeline, and utilizing the cooling water to contact the top gas to perform heat exchange and cooling on the top gas;

[0040] Connecting a softened water supply pipeline to the upper inlet of the cooling and purification tower, supplying purified water to the cooling and purification tower through the softened water supply pipeline, and using the purified water 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 transmission pipeline of the purified top coal gas, and 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, wherein the blast furnace generates top gas, and the top gas is applied to any of the top gas processing systems described above, or the top gas is applied to the top gas processing method described above.

[0043] As described above, the present invention provides a top gas processing system and method, and a blast furnace, which have the following beneficial effects: the present invention can connect the top gas supply pipeline with the bottom inlet of the cooling and purification tower, and then supply the top gas to the cooling and purification tower through the top gas supply pipeline; and connect the cooling water supply pipeline with 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 contacts the top gas to perform heat exchange and cooling on the top gas; and connect the softened water supply pipeline with 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, the top gas outlet of the cooling and purification tower is connected with the downstream transmission pipeline of the purified top gas, and the top gas treated by heat exchange, cooling and purification is output to the outside. It can be seen that in the cooling and purification tower, the cooling water and the top gas can be in direct contact for heat exchange and cooling, and the softened water and the top gas after heat exchange and cooling can be in direct contact for washing and purification; therefore, the present invention can carry out two different top gas purification processes in the cooling and purification tower, which is equivalent to being able to achieve top gas cooling and dust removal in the same set of equipment. Therefore, the present invention can not only reduce the content of acidic gas components in the top gas, but also reduce the corrosion of the top gas to subsequent processes, thereby providing higher quality raw gas for subsequent processes and ensuring the safe and stable operation of subsequent process equipment. In addition, after the cooling and purification tower is specially designed, the direct top gas cooling scheme provided by the present invention has advantages in terms of investment, operating cost and land occupation compared with the partition wall cooling scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A connection diagram of a top gas processing system provided by an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of a process for treating top gas provided by an embodiment of the present invention;

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

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

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

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

[0050] Description of reference numerals:

[0051] 1- Cooling purification tower;

[0052] 2- Softened water circulation pump;

[0053] 3-Fluid infusion 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- Purify the downstream pipeline of top gas;

[0065] 15-Cooling water supply pipeline;

[0066] 16- Softened water supply pipeline;

[0067] 17- Softened water replenishment pipeline;

[0068] 19- sampling port;

[0069] 20- Wastewater discharge pipe. DETAILED DESCRIPTION

[0070] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0071] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0072] In an exemplary embodiment, if Figure 1 As shown, Figure 1 The connection diagram of the top gas treatment system provided in the present embodiment is shown. Specifically, the present 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 the present embodiment or other embodiments, the cooling and purification tower 1 may be provided with a top gas outlet, an upper inlet, a middle outlet, a middle inlet, a bottom inlet and a bottom liquid outlet in sequence from top to bottom, that is, the upper inlet is below the top gas outlet, the middle outlet is below the upper inlet, the middle outlet is below the middle inlet, the bottom inlet is below the middle inlet, and the bottom liquid outlet is below the bottom inlet. As 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 is the middle inlet and the bottom inlet from top to bottom, and the first two on the right side of the cooling and purification tower 1 are the upper inlet and the middle outlet from top to bottom.

[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 top gas generated by an oxygen blast furnace.

[0074] The cooling water supply pipe 15 is connected to the middle 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 contacts the top gas, the top gas is cooled by heat exchange. Figure 1 As shown, in this embodiment or other embodiments, when the cooling water supply pipe 15 supplies cooling water to the cooling purification tower 1 for the first time, it may supply circulating cooling water or original cooling water that has not been circulated; when the cooling water supply pipe 15 supplies cooling water to the cooling purification tower 1 for the second time and thereafter, it may supply circulating cooling water. In this embodiment or other embodiments, a second flow control valve may be further provided on the cooling water supply pipe 15, and the second flow control valve is used to control the top gas outlet temperature.

[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. 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 purification tower 1 for the first time, it may 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 purification tower 1 for the second time and thereafter, it may supply circulating softened water or supplementary softened water.

[0076] The top gas outlet of the cooling and purification tower 1 is connected to the purified top gas downstream delivery pipeline 14, so as to output the top gas which has undergone heat exchange, cooling and purification to the outside.

[0077] It can be seen that in the cooling and purification tower, the cooling water and the top gas can directly contact for heat exchange and cooling, and the softened water and the top gas after heat exchange and cooling can directly contact for washing and purification; therefore, this embodiment can perform two different top gas purification processes in the cooling and purification tower, which is equivalent to being able to achieve top gas cooling and dust removal in the same set of equipment. Therefore, this embodiment can not only reduce the content of acidic gas components in the top gas, but also reduce the corrosion of the top gas to the subsequent process, thereby providing a higher quality raw gas for the subsequent process and ensuring the safe and stable operation of the subsequent process equipment.

[0078] According to the above records, in an exemplary embodiment, the top gas treatment system may also include: a cooling tower 7, a cooling water pool 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 and purification tower 1, and the cooling tower 7 is used to cool the cooling water flowing out of the bottom liquid outlet and use it as circulating cooling water for recycling; the cooling water pool 6 is connected to the cooling tower 7, and the cooling water pool 6 is used to store circulating cooling water for recycling; the cooling water circulation pump 4 is connected to the cooling water pool 6, and the cooling water circulation pump 4 is used to pressurize the circulating cooling water in the cooling water pool 6; the self-cleaning filter 5 is respectively connected to the outlet of the cooling water circulation pump 4 and the inlet of the cooling water supply pipe 15, and the self-cleaning filter 5 is used to filter the circulating cooling water output by the cooling water circulation pump 4, and supply the purified circulating cooling water to the cooling and purification tower 1 through the cooling water supply pipe 15, and the wastewater generated when filtering the circulating cooling water flows out to the wastewater collection pool 11. It can be seen from this that the present embodiment can utilize the cooling water pool to store circulating cooling water that needs to be circulated and used, and at the same time, can utilize the cooling water circulation pump to pressurize the circulating cooling water in the cooling water pool and then flow it out to the self-cleaning filter, so that the circulating cooling water is filtered through the self-cleaning filter, and the purified circulating cooling water obtained after filtration is passed through the cooling water supply pipeline flow cooling purification tower, so that the purified circulating cooling water contacts with the top coal gas and performs heat exchange and cooling of the top coal gas; and the circulating cooling wastewater obtained when filtering the circulating cooling water flows out to the wastewater collection pool for storage.

[0079] According to the above records, in an exemplary embodiment, the top gas treatment system may further include: a softened water replenishment pipeline 17, a replenishment pump 3 and a softened water circulation pump 2. Specifically, the softened water replenishment pipeline 17 is connected to the external softened water network, and the softened water replenishment pipeline 17 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 pipeline 17, and the outlet of the replenishment pump 3 is connected to the inlet of the softened water supply pipeline 16. The softened water circulation pump 2 is used to pressurize the softened water flowing out of the middle outlet of the cooling and purification tower 1 as circulating softened water for recirculation; wherein the inlet of the softened water circulation pump 2 is connected to the middle outlet of the cooling and purification tower 1, and the outlet of the softened water circulation pump 2 is respectively connected to the inlet of the softened water supply pipeline 16 and the outlet of the replenishment pump 3. It can be seen that when the softened water in the cooling and purification tower is lost or discharged, the softened water can be supplemented by the external softened water network through the softened water replenishment pipe 17 in this embodiment, and then the replenishment pump 3 pressurizes the supplemented softened water and flows it to the cooling and purification tower 1 through the outlet of the softened water supply pipe 16, so that the supplemented softened water can be used to purify the top gas after heat exchange and cooling. At the same time, the softened water flowing out of the middle outlet of the cooling and purification tower 1 is pressurized by the softened water circulation pump 2 and used as circulating softened water for recycling, and flows to the inlet of the softened water supply pipe 16, so that the top gas after heat exchange and cooling can be purified by circulating softened water.

[0080] According to the above records, in an exemplary embodiment, the top gas treatment system may also 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 the first flow control valve 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 the wastewater discharge pipe 20 is used to discharge softened wastewater; the sampling port 19 is connected to the wastewater discharge pipe 20, and the sampling port 19 is used for external personnel to collect circulating softened wastewater samples, and the circulating softened wastewater samples are used to analyze the impurity content in the circulating softened water. In this embodiment or other embodiments, the external personnel can be staff members who analyze the impurity content in the circulating softened water, or they can be sampling personnel who take circulating softened wastewater samples. Figure 1 As shown, the outlet of the wastewater discharge pipe 20 in this embodiment can be set between the cooling tower 7 and the bottom liquid outlet of the cooling and 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 records, in an exemplary embodiment, the cooling water pool 6 may also include: a dosing device 8, a bypass filter 9 and a bypass filter pump 10. Specifically, the bypass filter pump 10 is connected to the cooling water pool 6, the bypass filter 9, and the wastewater collection pool 11, respectively, and the bypass filter pump 10 is used to pressurize the circulating cooling water in the cooling water pool 6, and flow out to the bypass filter 9 and the wastewater collection pool 11 respectively. The bypass filter 9 is used to remove impurities and dust in the circulating cooling water, and flow the purified circulating cooling water to the cooling water pool 6, and flow the wastewater generated when purifying the circulating cooling water to the wastewater collection pool 11. The dosing device 8 is connected to the cooling water pool 6, and is used to add a reagent to the cooling water pool 6 to improve the water quality in the cooling water pool 6. In this embodiment or other embodiments, when the dosing device 8 adds the reagent to the cooling water pool 6, the reagent can be automatically added according to a preset program at a fixed time, or the reagent can be added manually at a fixed time or non-fixed time. The medicine added by the medicine adding device 8 is mainly used to improve the water quality in the cooling water pool 6, so the type and dosage of the medicine can be set according to the specific situation, and this embodiment does not make any specific limitations here.

[0082] According to the above records, in an exemplary embodiment, the top gas treatment system may further include: a wastewater pump 12, which is connected to the wastewater collection tank 11 and is used to pressurize the wastewater in the wastewater collection tank 11 and then flow it out to the external production wastewater pipe network. In addition, in order to maintain the liquid level of the cooling water tank, the cooling water in the cooling water tank can also be supplemented according to the wastewater discharge amount flowing out to the external production wastewater pipe network.

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

[0084] According to the above records, in an exemplary embodiment, a sieve plate is further provided at the bottom of the cooling and purification tower 1, and the sieve plate is used 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 be heat exchanged, cooled and roughly washed; a partition device is provided in the middle of the cooling and purification tower 1, and the partition device is used to prevent the circulating softened water at the top 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 and airflow distribution of the top gas; a circulating softened water purification space is provided at the top of the cooling and purification tower 1, and the circulating softened water purification space is used to circulate softened water to finely wash the top gas that has been cooled and roughly washed again, so as to reduce the dust and acidic impurity components in the top gas; a coalescing internal is provided at the top of the cooling and purification tower 1, and the coalescing internal is used to deliquate the top gas that has been finely washed, so as to reduce the free water content in the top gas. In this embodiment or other embodiments, the structural layout of the cooling and purification tower 1 from top to bottom can be the top, the upper part, the middle part and the bottom part, 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 gas generated by the dust removal system of the upstream device is transported to the bottom inlet of the cooling and purification tower 1 through the top gas supply pipeline 13, and the top gas enters the cooling and purification tower 1. The top gas entering the cooling and purification tower 1 is reversely contacted with the cooling water entering from the middle inlet of the cooling and purification tower 1 on the sieve plate for heat exchange and rough washing. At the same time, since a partition device is provided in the middle of the cooling and purification tower 1, the circulating softened water and the circulating cooling water cannot enter each other's space, and the partition device does not affect the smooth passage and airflow distribution of the top gas, so the top gas after cooling and rough washing is finely washed again in the circulating softened water purification space by the circulating softened water sprayed in reverse. Finally, the top gas after fine washing 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 of the purified top gas, so as to be sent to the downstream process or downstream device through the downstream conveying pipeline 14 of the purified top gas. It can be seen that after the cooling and purification tower is specially designed in this embodiment, compared with the partition wall cooling scheme, the top gas direct cooling scheme provided in this embodiment has advantages in terms of investment, operating cost and land occupation.

[0085] According to the above records, in a specific example, the example is 450000Nm 3 / h of top gas, the specific parameters of the top gas are shown in Table 1 below.

[0086] Table 1 Top gas specific parameters

[0087]

[0088] When the top gas enters the cooling and purification tower 1, the circulating cooling water is directly in contact with the top gas to cool the top gas from 120°C to about 40°C; the cooling tower 7 is used to cool the circulating cooling water, and the circulating cooling water temperature is reduced from 60°C to about 30°C. After being treated by the cooling and purification tower 1, the chloride ion content at the outlet is 5mg / Nm 3 The removal efficiency reaches 95.0%, and the dust content at the outlet is reduced to 2mg / Nm 3 , the parameters of each device under working condition 1 and working condition 2 are shown in Table 2 and Table 3.

[0089] Table 2 Equipment parameters under working condition 1

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

[0091] Table 3 Equipment parameters under working condition 2

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

[0093] After the top gas is treated by the cooling and purification tower 1, the detection results of the purified top gas 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, 15.7t / h (operating condition 1) and 45.4t / h (operating condition 2) of water will be precipitated after the circulating top gas undergoes the cooling process. This amount of water can offset the amount of water vapor evaporated by the cooling tower when operating at a higher temperature. Therefore, when the cooling tower operates at a higher temperature, there is no need to add a large amount of produced water.

[0097] In summary, the present invention provides a top gas treatment system, which can connect the top gas supply pipeline with the bottom inlet of the cooling and purification tower, and then supply the top gas to the cooling and purification tower through the top gas supply pipeline; and connect the cooling water supply pipeline with 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 contacts the top gas to perform heat exchange and cooling on the top gas; and connect the softened water supply pipeline with 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, the top gas outlet of the cooling and purification tower is connected with the downstream transmission pipeline of the purified top gas, and the top gas treated by heat exchange, cooling and purification is output to the outside. It can be seen that in the cooling and purification tower, the cooling water and the top gas can be directly contacted for heat exchange and cooling, and the softened water and the top gas after heat exchange and cooling can be directly contacted for washing and purification; therefore, this system can carry out two different purification processes of the top gas in the cooling and purification tower, which is equivalent to being able to achieve top gas cooling and dust removal in the same set of equipment at the same time. Therefore, this system can not only reduce the content of acidic gas components in the top gas, but also reduce the corrosion of the top gas to the subsequent process, thereby providing a higher quality raw gas for the subsequent process and ensuring the safe and stable operation of the subsequent process equipment. In addition, after the cooling and purification tower is specially designed, the direct cooling scheme of the top gas provided by this system has advantages in investment, operating cost and land occupation compared with the partition cooling scheme. Therefore, this system can realize the simultaneous cooling and purification of the circulating top gas, that is, it can not only reduce the gas temperature to meet the requirements of the subsequent process, but also reduce the dust and acidic gas components in the circulating top gas at the same time, thereby reducing the probability of subsequent equipment being blocked, corroded and failed due to impurities in the circulating top gas. At the same time, the circulating top gas and cooling water are directly contacted for heat exchange, which has higher efficiency than the partition wall heat exchange, reduces the use of circulating cooling water, reduces the energy consumption of device operation, and improves energy utilization efficiency.

[0098] In another exemplary embodiment of the present invention, Figure 2 As shown, Figure 2 The schematic diagram of the process of treating top gas provided by this embodiment is shown. Specifically, this embodiment provides a method for treating top gas, which comprises the following steps:

[0099] S210, connect the top gas supply pipeline with the bottom inlet of the cooling and purification tower, and supply the 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 top gas generated by an oxygen blast furnace.

[0100] S220, connect the cooling water supply pipeline with the middle inlet of the cooling and purification tower, supply cooling water to the cooling and purification tower through the cooling water supply pipeline, and use the cooling water to contact the top gas to perform heat exchange and cooling on the top gas. 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 may supply circulating cooling water or original cooling water that has not been circulated; when the cooling water supply pipeline supplies cooling water to the cooling purification tower for the second time and thereafter, it may supply circulating cooling water. In this embodiment or other embodiments, a second flow control valve may be further provided on the cooling water supply pipeline, and the second flow control valve is used to control the top gas outlet temperature.

[0101] S230, connect the softened water supply pipeline to the upper inlet of the cooling and purification tower, supply purified water to the cooling and purification tower through the softened water supply pipeline, and use the purified water 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 pipeline supplies softened water to the cooling purification tower for the first time, it may supply circulating softened water or softened water that has not been circulated; when the softened water supply pipeline supplies softened water to the cooling purification tower for the second time and thereafter, it may supply circulating softened water or supplementary softened water.

[0102] S240, connecting the top gas outlet of the cooling and purification tower with the downstream transmission pipeline of the purified top coal gas, and outputting the top coal gas that has undergone heat exchange, cooling and purification to the outside.

[0103] It can be seen that in the cooling and purification tower, the cooling water and the top gas can directly contact for heat exchange and cooling, and the softened water and the top gas after heat exchange and cooling can directly contact for washing and purification; therefore, this embodiment can perform two different top gas purification processes in the cooling and purification tower, which is equivalent to being able to achieve top gas cooling and dust removal in the same set of equipment. Therefore, this embodiment can not only reduce the content of acidic gas components in the top gas, but also reduce the corrosion of the top gas to the subsequent process, thereby providing a higher quality raw gas for the subsequent process and ensuring the safe and stable operation of the subsequent process equipment.

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

[0105] S310, connecting the cooling tower to the bottom liquid outlet of the cooling and purification tower, cooling the cooling water flowing out of the bottom liquid outlet through the cooling tower and using it as circulating cooling water for reuse;

[0106] S320, connecting the cooling water pool to the cooling tower, and storing circulating cooling water for cyclic use in the cooling water pool;

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

[0108] S340, connect the self-cleaning filter to the outlet of the cooling water circulation pump and the inlet of the cooling water supply pipe respectively, filter the circulating cooling water output by the cooling water circulation pump through the self-cleaning filter, supply the purified circulating cooling water to the cooling purification tower through the cooling water supply pipe, and discharge the wastewater generated when filtering the circulating cooling water to the wastewater collection tank.

[0109] It can be seen from this that the present embodiment can utilize the cooling water pool to store circulating cooling water that needs to be circulated and used, and at the same time, can utilize the cooling water circulation pump to pressurize the circulating cooling water in the cooling water pool and then flow it out to the self-cleaning filter, so that the circulating cooling water is filtered through the self-cleaning filter, and the purified circulating cooling water obtained after filtration is passed through the cooling water supply pipeline flow cooling purification tower, so that the purified circulating cooling water contacts with the top coal gas and performs heat exchange and cooling of the top coal gas; and the circulating cooling wastewater obtained when filtering the circulating cooling water flows out to the wastewater collection pool for storage.

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

[0111] S410, connecting the softened water replenishment pipeline to the external softened water network, and replenishing softened water through the softened water replenishment pipeline;

[0112] S420, connecting the inlet of the rehydration pump to the outlet of the softened water rehydration pipeline, and connecting the outlet of the rehydration pump to the inlet of the softened water supply pipeline, and pressurizing the supplemented softened water through the rehydration pump;

[0113] S430, connecting the inlet of the softened water circulation pump with the middle outlet of the cooling and purification tower, and connecting the outlet of the softened water circulation pump with the inlet of the softened water supply pipe and the outlet of the replenishing pump respectively, and pressurizing the softened water flowing out of the middle outlet of the cooling and purification tower by the softened water circulation pump as circulating softened water for reuse.

[0114] It can be seen that when the softened water in the cooling and purification tower is lost or discharged, the softened water can be supplemented by the external softened water network through the softened water replenishment pipeline in this embodiment, and then the replenished softened water is pressurized by the replenishment pump and flows to the cooling and purification tower through the outlet of the softened water supply pipeline, so that the supplemented softened water can be used to purify the top gas after heat exchange and cooling. At the same time, the softened water flowing out of the middle outlet of the cooling and purification tower is pressurized by the softened water circulation pump and used as circulating softened water for recycling, and flows to the inlet of the softened water supply pipeline, so that the circulating softened water can be used to purify the top gas after heat exchange and cooling.

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

[0116] S510, connecting the first flow control valve to the softened water supply pipeline, and controlling the circulation flow of the softened water through the first flow control valve;

[0117] S520, connect the wastewater discharge pipe to the softened water circulation pump, and discharge the softened wastewater through the wastewater discharge pipe; and connect the sampling port to the wastewater discharge pipe, collect the circulating softened wastewater sample through the sampling port, and the circulating softened wastewater sample is used to analyze the impurity content in the circulating softened water. In this embodiment or other embodiments, the external personnel can be the staff who analyzes the impurity content in the circulating softened water, or the sampling personnel who collects the circulating softened wastewater sample. The outlet of the wastewater discharge pipe in this embodiment can be set 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, if Figure 6 As shown, in an exemplary embodiment, if the cooling water pool in the above embodiment includes: a dosing device, a bypass filter and a bypass filter pump; then the top gas treatment method may also include the following steps:

[0119] S610, connect the bypass filter pump to the cooling water pool, the bypass filter, and the wastewater collection pool respectively, pressurize the circulating cooling water in the cooling water pool through the bypass filter pump, and let the pressurized circulating cooling water flow out to the bypass filter and the wastewater collection pool respectively.

[0120] S620, removing impurities and dust in the circulating cooling water through a bypass filter, and flowing the purified circulating cooling water into a cooling water pool, and flowing the wastewater generated when purifying the circulating cooling water into a wastewater collection pool.

[0121] S630, connecting the wastewater pump to the wastewater collection tank, pressurizing the wastewater in the wastewater collection tank through the wastewater pump and then flowing out to the external production wastewater pipe network. In addition, in order to maintain the liquid level of the cooling water tank, the cooling water in the cooling water tank can also be supplemented according to the wastewater discharge amount flowing out to the external production wastewater pipe network.

[0122] In this embodiment, the dosing device can also be connected to the cooling water pool, and the dosing device can be used to add medicine to the cooling water pool to improve the water quality in the cooling water pool. In this embodiment or other embodiments, when the dosing device adds medicine to the cooling water pool, the dosing device can automatically add medicine according to a pre-set program, or can manually actively add medicine on a regular or non-regular basis. Among them, the medicine added by the dosing device is mainly used to improve the water quality in the cooling water pool, so the type and dosage of the medicine can be set according to the specific situation, and this embodiment does not make specific limitations here.

[0123] According to the above records, in an exemplary embodiment, if the bottom liquid outlet of the cooling and purification tower is also connected to a circulating cooling water drainage pipeline, the top gas treatment method may also include the following steps: a liquid level control valve is set in the circulating cooling water drainage pipeline, and the bottom liquid level of the cooling and purification tower is controlled by the liquid level control valve to prevent the top gas from leaking out; and a pressure control valve is set at the top gas outlet of the cooling and purification tower, and the pressure of the cooling and purification tower is adjusted by the pressure control valve.

[0124] According to the above records, in an exemplary embodiment, the top gas treatment method may also include the following steps: a sieve plate is arranged at the bottom of the cooling and purification tower, and the contact and mass transfer between the top gas and the circulating cooling water are enhanced by the sieve plate, so that the circulating cooling water and the top gas are subjected to heat exchange, cooling and rough washing; and a partition device is arranged in the middle of the cooling and purification tower, and the circulating softened water at the upper part of the cooling and purification tower is prevented from entering the circulating cooling water at the bottom of the cooling and purification tower by the partition device, and the smooth passage and airflow distribution of the top gas are not affected; and a circulating softened water purification space is arranged at the upper part of the cooling and purification tower, and the top gas that has been cooled and roughly washed is finely washed again by the circulating softened water in the circulating softened water purification space, so as to reduce the dust acidic impurity components in the top gas; and a coalescing internal is arranged at the top of the cooling and purification tower, and the top gas that has been finely washed is deliquated by the coalescing internal, so as to reduce the free water content in the top gas. In this embodiment or other embodiments, the structural layout of the cooling and purification tower from top to bottom can be the top, upper part, middle part and bottom part, 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 gas generated by the dust removal system of the upstream device is transported to the bottom inlet of the cooling and purification tower through the top gas supply pipeline, and the top gas enters the cooling and purification tower. The top gas entering the cooling and purification tower contacts the cooling water entering from the middle inlet of the cooling and purification tower on the sieve plate for reverse heat exchange and rough washing. At the same time, due to the partition equipment provided in the middle of the cooling and purification tower, the circulating softened water and the circulating cooling water cannot enter each other's space, and the partition equipment does not affect the smooth passage and airflow distribution of the top gas, so the top gas after cooling and rough washing is finely washed again in the circulating softened water purification space by the reversely injected circulating softened water. Finally, the top gas after fine washing 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 transmission pipeline of the purified top gas, and then is sent to the downstream process or downstream device through the downstream transmission pipeline of the purified top gas. It can be seen that after the cooling and purification tower is specially designed, the direct cooling scheme of the top gas provided in this embodiment has advantages in terms of investment, operating cost and land occupation compared with the partition wall cooling scheme.

[0125] In summary, the present invention provides a top gas treatment method, which can connect the top gas supply pipeline with the bottom inlet of the cooling and purification tower, and then supply the top gas to the cooling and purification tower through the top gas supply pipeline; and connect the cooling water supply pipeline with 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 contacts the top gas to perform heat exchange and cooling on the top gas; and connect the softened water supply pipeline with 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, the top gas outlet of the cooling and purification tower is connected with the downstream transmission pipeline of the purified top gas, and the top gas treated by heat exchange, cooling and purification is output to the outside. It can be seen that in the cooling and purification tower, the cooling water and the top gas can be directly contacted for heat exchange and cooling, and the softened water and the top gas after heat exchange and cooling can be directly contacted for washing and purification; therefore, the method can perform two different purification processes of the top gas in the cooling and purification tower, which is equivalent to being able to achieve top gas cooling and dust removal in the same set of equipment at the same time. Therefore, the method can not only reduce the content of acidic gas components in the top gas, but also reduce the corrosion of the top gas to the subsequent process, thereby providing a higher quality raw gas for the subsequent process and ensuring the safe and stable operation of the subsequent process equipment. In addition, after the cooling and purification tower is specially designed, the direct cooling scheme of the top gas provided by the method has advantages in investment, operating cost and land occupation compared with the partition cooling scheme. Therefore, the method can realize the simultaneous cooling and purification of the circulating top gas, that is, it can not only reduce the gas temperature to meet the requirements of the subsequent process, but also reduce the dust and acidic gas components in the circulating top gas at the same time, thereby reducing the probability of subsequent equipment being blocked, corroded and failed due to impurities in the circulating top gas. At the same time, the circulating top gas and cooling water are directly contacted for heat exchange, which has higher efficiency than the partition wall heat exchange, reduces the use of circulating cooling water, reduces the energy consumption of device operation, and improves energy utilization efficiency.

[0126] It should be noted that the top gas treatment method provided in the above embodiment and the top gas treatment system provided in the above embodiment belong to the same concept, wherein the specific manner in which the top gas treatment system performs operations has been described in detail in the above system embodiment, and will not be repeated here. In practical applications, the top gas treatment method provided in the above embodiment can allocate the above functions to different functional modules as needed, that is, divide the internal structure of the top gas treatment method into different functional modules, and then implement all or part of the functions of the corresponding functional modules through the top gas treatment system described in the above embodiment, and this is not specifically limited here.

[0127] In another exemplary embodiment of the present invention, the embodiment further provides a blast furnace, which can produce top gas as described in the above embodiment, and the top gas can be applied to the top gas method and / or top gas treatment system as described in the above embodiment. Since the specific manner in which the top gas treatment system and the top gas method perform operations has been described in detail in the above embodiment, the technical functions and effects of the blast furnace provided in this embodiment can be referred to the above embodiment, 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, etc. in the embodiments of the present invention, these terms are only used to distinguish flow control valves from each other. For example, without departing from the scope of the embodiments of the present invention, the first flow control valve may also be referred to as the second flow control valve, and similarly, the second flow control valve may also be referred to as the 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 present invention. Anyone familiar with the art may 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A top gas treatment system, characterized in that: The system comprises: Cooling and purification tower (1); A 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); A cooling water supply pipeline (15) is connected to the middle inlet of the cooling and purification tower (1) and is used to supply cooling water to the cooling and purification tower (1). After the cooling water contacts the top gas, the top gas is cooled by heat exchange. A softened water supply pipeline (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), 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 (1) is connected to the purified top gas downstream delivery pipeline (14) for outputting the top gas that has undergone heat exchange, cooling and purification treatment to the outside.

2. The top gas processing system according to claim 1, characterized in that: The system also includes: A 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 use it as circulating cooling water for re-circulation; A cooling water pool (6), which is connected to the cooling tower (7) and is used to store circulating cooling water for cyclic use; A cooling water circulation pump (4), connected to the cooling water pool (6), for pressurizing 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), and is used to filter the circulating cooling water output by the cooling water circulation pump (4), supply the purified circulating cooling water to the cooling and purification tower (1) through the cooling water supply pipe (15), and discharge the wastewater generated when filtering the circulating cooling water to the wastewater collection tank (11).

3. The top gas processing system according to claim 1 or 2, characterized in that: The system also includes: A softened water replenishment pipeline (17), connected to an external softened water network, for replenishing softened water; A rehydration pump (3) for pressurizing the supplemented softened water, wherein the inlet of the rehydration pump (3) is connected to the outlet of the softened water rehydration pipeline (17), and the outlet of the rehydration pump (3) is connected to the inlet of the softened water supply pipeline (16); The softened water circulation pump (2) is used to pressurize the softened water flowing out of the middle outlet of the cooling and purification tower (1) and use it as circulating softened water for recirculation. The inlet of the softened water circulation pump (2) is connected to the middle outlet of the cooling and purification tower (1), and the outlet of the softened water circulation pump (2) is respectively connected to the inlet of the softened water supply pipeline (16) and the outlet of the liquid replenishing pump (3).

4. The top gas processing system according to claim 3, characterized in that: The system also includes: a first flow control valve, connected to the softened water supply pipeline (16), for controlling the circulation flow of softened water; A wastewater discharge pipe (20), which is in communication with the softened water circulation pump (2) and is used for discharging 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, and the circulating softened wastewater samples are used to analyze the impurity content in the circulating softened water.

5. The top gas processing system according to claim 2, characterized in that: The cooling water pool (6) is also provided with: A bypass filter pump (10) is respectively connected to the cooling water pool (6), the bypass filter (9), and the wastewater collection pool (11), and is used to pressurize the circulating cooling water in the cooling water pool (6) and flow it out to the bypass filter (9) and the wastewater collection pool (11); A bypass filter (9) is used to remove impurities and dust from the circulating cooling water, and to allow the purified circulating cooling water to flow out to the cooling water pool (6), and to allow waste water generated when purifying the circulating cooling water to flow out to the waste water collection pool (11); A dosing device (8) is connected to the cooling water pool (6) and is used to add a medicine to the cooling water pool (6).

6. The top gas processing system according to claim 5, characterized in that: The system also includes: A 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 then flow it out to an external production wastewater pipe network.

7. The top gas processing system according to claim 2, characterized in that: The bottom liquid outlet of the cooling and purification tower (1) is also connected to a circulating cooling water drainage pipeline, and the circulating cooling water drainage pipeline is provided with a liquid level control valve, and the liquid level control valve is used to control the bottom liquid level of the cooling and purification tower (1); A pressure control valve is also provided at the top gas outlet of the cooling and purification tower (1), and the pressure control valve is used to adjust the pressure of the cooling and purification tower (1).

8. The top gas processing system according to claim 1 or 2, characterized in that: The bottom of the cooling and purification tower (1) is also provided with a sieve hole tray, which is used 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 perform heat exchange, cooling and rough washing; A partition device is provided in the middle of the cooling and purification tower (1), and the partition device is used to prevent the circulating softened water at 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); The upper part of the cooling and purification tower (1) is provided with a circulating softened water purification space, and the circulating softened water purification space is used to circulate softened water to perform fine washing again on the top coal gas that has been cooled and roughly washed, so as to reduce the dust acidic impurity components in the top coal gas; The top of the cooling and purification tower (1) is provided with a coalescing internal component, and the coalescing internal component is used to carry out a liquid removal treatment on the top gas that has been finely washed, so as to reduce the free water content in the top gas.

9. The top gas processing system according to claim 1, characterized in that: The cooling water supply pipeline (15) is provided with a second flow control valve, and the second flow control valve is used to control the top gas outlet temperature.

10. A method for treating top gas, characterized in that: The method comprises the following steps: Connecting a top gas supply pipeline to a bottom inlet of a cooling and purification tower, and supplying top gas to the cooling and purification tower through the top gas supply pipeline; Connecting a cooling water supply pipeline with the middle inlet of the cooling purification tower, supplying cooling water to the cooling purification tower through the cooling water supply pipeline, and utilizing the cooling water to contact the top gas to perform heat exchange and cooling on the top gas; Connecting a softened water supply pipeline to the upper inlet of the cooling and purification tower, supplying purified water to the cooling and purification tower through the softened water supply pipeline, and using the purified water 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 transmission pipeline of the purified top coal gas, and the top coal gas that has undergone heat exchange, cooling and purification treatment is output to the outside.

11. A blast furnace, characterized in that: The blast furnace generates top gas, and the top gas is applied to the top gas processing system as described in any one of claims 1 to 9, or the top gas is applied to the top gas processing method as described in claim 10.

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