A condenser cooling system

Abstract

The present application relates to coke oven gas cooling technical field, specifically, it relates to a kind of primary cooler cooling system, the primary cooler cooling system of the present application improvement is in that, tar ammonia water separation interface area side wall of tar ammonia water separation tank is additionally provided with lower section liquid supply outlet group and control valve, and second pipeline is led out on the fourth pipeline between liquid supplementing liquid supply dual-purpose port and lower section condensate spraying pump, the second pipeline is connected with the lower section liquid supply outlet group, so that lower section liquid supply outlet group is communicated with the liquid supplementing liquid supply dual-purpose port on lower section condensate tank;The primary cooler cooling system of the present application is more convenient and fast to operate, and in the process of liquid supplementing, tar ammonia water separation tank can also continuously supply liquid to upper section condensate spraying pump by upper section liquid supply outlet group, without stopping the spraying of upper section condensate, and the cooling efficiency of system is higher.

Description

Technical Field

[0001] This invention relates to the field of coke oven gas cooling technology, and more specifically, to a primary cooler cooling system. Background Technology

[0002] The primary cooler is a key piece of equipment in the pretreatment of coke oven gas and one of the most crucial components of gas purification. Its main function is to cool the high-temperature (78-86℃) coke oven gas entering the coke oven to a lower temperature (20-22℃), while simultaneously removing impurities such as tar and naphthalene from the gas. Currently, primary coolers are generally divided into upper and lower cooling sections. The upper section uses circulating water for cooling, while the lower section uses low-temperature water. A cooling tray is installed in between. Simultaneously, a tar-ammonia-water mixture is continuously sprayed into the upper and lower sections from the blast cooling tank area to wash away impurities such as tar and naphthalene from the gas. The upper section of the primary cooler has a higher temperature (38-45℃ for the gas in the middle section). The gas enters from the top and exits from the bottom. Under normal circumstances, the cooling water pipes inside the upper section of the primary cooler accumulate less tar, naphthalene, coke powder, and other impurities. However, in the lower section, due to the lower gas temperature (20-22℃ at the gas outlet), most of the tar, naphthalene, and other impurities in the gas accumulate on the walls of the lower cooling water pipes. To ensure the cooling efficiency of the lower cooling water pipes, it is necessary to continuously spray the lower cooling water pipes with lower condensate (a tar-ammonia water mixture with a tar content of 30-40%) for washing. To ensure the quality of the lower condensate, it needs to be replaced periodically. However, the existing primary cooler cooling system has the following problems: the workload of replacing the lower condensate is large; the spraying of the upper condensate must be stopped during the replacement process; and because tar has a higher density than ammonia water, tar deposition is likely to occur in the replaced lower condensate, making it impossible to guarantee the stability of the condensate quality over a long period. Summary of the Invention

[0003] The technical problem solved by this invention is at least one of the following: the workload of replacing the lower section condensate in the existing primary cooler cooling system is large; the spraying of the upper section condensate needs to be stopped during the replacement process; since tar has a higher density than ammonia, tar deposition is likely to occur in the replaced lower section condensate, making it impossible to guarantee the quality stability of the condensate for a long time.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A primary cooler cooling system includes a primary cooler, a water seal tank, a lower condensate tank, a lower condensate spray pump, a tar-ammonia-water separation tank, and an upper condensate spray pump. The primary cooler has an upper condensate inlet, a lower condensate inlet, an upper condensate outlet, and a lower condensate outlet. The lower condensate outlet is connected to the water seal tank and the lower condensate tank sequentially via pipelines. An on / off valve is provided at the lower condensate outlet. The lower condensate tank has a dual-purpose supply and replenishment port, which is equipped with a supply valve. The supply and replenishment port is connected to the lower condensate spray pump via a fourth pipeline. The lower condensate spray pump is connected to the lower condensate inlet via a first pipeline. A lower condensate supply is provided on the side wall of the tar-ammonia-water separation tank at the tar-ammonia-water separation interface area. The lower section liquid supply outlet group includes at least two lower section liquid supply outlets arranged at intervals from top to bottom, and the upper section liquid supply outlet group includes at least two upper section liquid supply outlets arranged at intervals from top to bottom. Both the lower section liquid supply outlets and the upper section liquid supply outlets are equipped with control valves. The upper section liquid supply outlet group is connected to the upper section condensate spray pump and the upper section condensate inlet in sequence through a third pipeline. A second pipeline is led out from the fourth pipeline and is connected to the lower section liquid supply outlet group. The second pipeline is equipped with a replenishment valve. There is a height difference between the tar ammonia water separation tank and the lower section condensate tank, so that the liquid in the tar ammonia water separation tank flows from the lower section liquid supply outlet group to the replenishment and supply port of the lower section condensate tank under hydraulic drive.

[0006] Preferably, a backflushing pipe is led out from the first pipeline, and the outlet of the backflushing pipe faces upward and extends into the bottom of the lower section of the condensate tank.

[0007] Preferably, the backwash pipe is equipped with a backwash valve.

[0008] Preferably, a first sampling tube is led out from the fourth pipeline, and a first sampling valve is provided on the first sampling tube.

[0009] Preferably, the second pipeline is provided with a second sampling tube, and the second sampling tube is provided with a second sampling valve.

[0010] Preferably, the control valve is a flow regulating valve.

[0011] Preferably, the primary cooler cooling system further includes a controller, wherein the control valve and the opening / closing valve are both electric valves, and the controller is connected to the control valve, the opening / closing valve, the lower condensate spray pump and the upper condensate spray pump respectively.

[0012] Preferably, an external discharge pipe is led out from the first pipeline, the outlet of the external discharge pipe is connected to the tar-ammonia water separation tank, and an external discharge valve is provided on the external discharge pipe.

[0013] Preferably, a replenishment pump is provided on the second pipeline.

[0014] Preferably, the lower liquid supply outlet group includes 5 lower liquid supply outlets arranged at intervals from top to bottom, and the upper liquid supply outlet group includes 3 upper liquid supply outlets arranged at intervals from top to bottom.

[0015] Compared with the prior art, the improvement of the present invention is that a lower section liquid supply outlet group and a control valve are added to the side wall of the tar ammonia water separation interface area of ​​the tar ammonia water separation tank, and a second pipeline is led out from the fourth pipeline between the liquid supply and replenishment port and the lower section condensate spray pump. The second pipeline is connected to the lower section liquid supply outlet group, thereby enabling the lower section liquid supply outlet group to be connected to the liquid supply and replenishment port on the lower section condensate tank. When replenishing the lower condensate tank, the primary cooler cooling system of this invention controls the opening and closing of the valve on the lower supply outlet to ensure that the mixture discharged from the lower supply outlet group meets the composition requirements of the lower condensate (a tar-ammonia water mixture with a tar content of 30-40%). This mixture is then directly introduced into the lower condensate tank through a second pipeline under hydraulic drive, making the operation more convenient and faster. Moreover, during the replenishment process, the tar-ammonia water separation tank can continuously supply liquid to the upper condensate spray pump through the upper supply outlet group without stopping the upper condensate spraying, resulting in higher system cooling efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the primary cooler cooling system in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the existing primary cooler cooling system.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Primary cooler; 2. Water seal tank; 3. Lower condensate tank; 301. Makeup supply valve; 4. Lower condensate spray pump; 5. Tar-ammonia water separator; 6. Upper condensate spray pump; 7. First pipeline; 701. Backwash pipe; 7011. Backwash valve; 702. External drain pipe; 7021. External drain valve; 8. Lower condensate supply outlet group; 801. First lower condensate supply outlet; 802. Second lower condensate supply outlet; 803. Third lower condensate supply outlet. 804, Fourth Lower Section Liquid Supply Outlet, 805, Fifth Lower Section Liquid Supply Outlet, 9, Upper Section Liquid Supply Outlet Group, 901, First Upper Section Liquid Supply Outlet, 902, Second Upper Section Liquid Supply Outlet, 903, Third Upper Section Liquid Supply Outlet, 10, Second Pipeline, 101, Second Sampling Pipe, 1011, Second Sampling Valve, 11, Lower Section Liquid Replenishment Pipeline, 12, Third Pipeline, 13, Fourth Pipeline, 131, First Sampling Pipe, 1311, First Sampling Valve. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] It should be noted that, unless otherwise specified, the features in the embodiments of this invention can be combined with each other. The terms "comprising," "including," "containing," and "having" are not restrictive and can include other steps and other components that do not affect the result. The above terms cover the terms "composed of" and "substantially composed of."

[0022] It should be noted that, Figure 1 and Figure 2 In the diagram, arrow A represents raw coal gas from the coke oven, arrow B represents a tar-ammonia-water mixture from the coke oven, arrow C represents ambient temperature circulating return water, arrow D represents ambient temperature circulating inlet water, arrow E represents low temperature circulating return water, arrow F represents low temperature circulating inlet water, arrow G represents coal gas exiting the primary cooler, arrow J represents condensate inlet in the lower section of the primary cooler, arrow K represents condensate return in the lower section of the primary cooler, arrow M represents condensate inlet in the upper section of the primary cooler, arrow H represents condensate return in the upper section of the primary cooler, a represents the tar residue pre-separator, used to receive condensate return from the upper section of the primary cooler, and b represents the vent tank.

[0023] The structure of some primary cooler cooling systems in the prior art is as follows: Figure 2As shown, the primary cooler cooling system includes a primary cooler 1, a water seal tank 2, a lower condensate tank 3, a lower condensate spray pump 4, a tar-ammonia-water separation tank 5, and an upper condensate spray pump 6. The primary cooler 1 is equipped with an upper condensate inlet, a lower condensate inlet, an upper condensate outlet, and a lower condensate outlet. The lower condensate outlet is connected to the water seal tank 2 and the lower condensate tank 3 sequentially via pipelines. Both the lower condensate outlet and the lower condensate inlet are equipped with on / off valves. The lower condensate tank 3... The tank is equipped with a dual-purpose inlet for both replenishing and supplying liquid, and a replenishment / supply valve 301 is installed on the inlet. The inlet is connected to the lower-section condensate spray pump 4 via a fourth pipe 13. The lower-section condensate spray pump 4 is connected to the lower-section condensate inlet via a first pipe 7. An external drain pipe 702 extends from the first pipe 7, and its outlet is connected to the tar-ammonia-water separation tank 5. An external drain valve 7021 is installed on the external drain pipe 702. The tar-ammonia-water separation interface of the tar-ammonia-water separation tank 5 is described. An upper-section liquid supply outlet group 9 is provided on the side wall of the area. The upper-section liquid supply outlet group 9 includes a first upper-section liquid supply outlet 901, a second upper-section liquid supply outlet 902, and a third upper-section liquid supply outlet 903 arranged from top to bottom. Each of the three upper-section liquid supply outlets is equipped with a control valve (not shown in the figure). The upper-section liquid supply outlet group 9 is connected to the upper-section condensate spray pump 6 and the upper-section condensate inlet in sequence through a third pipeline 12. A lower-section replenishment pipeline 11 is led out from a fourth pipeline 13. The lower-section replenishment pipeline 11 is connected to... The upper liquid supply outlet group 9 is connected, and the lower liquid replenishment pipeline 11 is equipped with a liquid replenishment valve. There is a height difference between the tar ammonia water separation tank 5 and the lower condensate tank 3 (the tar ammonia water separation tank 5 is located above the lower condensate tank 3). There is generally a height difference of 5-10m between the upper liquid supply outlet group 9 of the tar ammonia water separation tank 5 and the liquid replenishment and supply port. The liquid in the upper liquid supply outlet group 9 of the tar ammonia water separation tank 5 can flow to the liquid replenishment and supply port of the lower condensate tank 3 under the pressure difference generated by the liquid level difference.

[0024] In addition, the primary cooler 1 of the primary cooler cooling system has a gas inlet at the top and a gas outlet at the bottom. The primary cooler 1 is divided into upper and lower cooling sections. The upper section uses ambient temperature circulating water for cooling, and the lower section uses low temperature water for cooling. The tar-ammonia-water separation tank 5 is equipped with an inlet for receiving the tar-ammonia-water mixture from the coke oven. The tar-ammonia-water mixture is separated into tar and ammonia water in the tar-ammonia-water separation tank 5. Due to the higher density of tar, tar is located in the lower layer and ammonia water is located in the upper layer. The tar and ammonia water in the tar-ammonia-water separation tank 5 gradually separate into layers. Therefore, there is a tar-ammonia-water separation interface region of a certain thickness between the tar layer and the ammonia water layer. The tar content in the tar-ammonia-water mixture in the tar-ammonia-water separation interface region gradually decreases from top to bottom. Therefore, the tar content in the tar-ammonia-water mixture discharged from the first upper liquid supply outlet 901, the second upper liquid supply outlet 902, and the third upper liquid supply outlet 903 is different, showing an increasing trend in sequence. By controlling the opening and closing of the control valve on the upper liquid supply outlet, the tar content in the tar-ammonia-water mixture discharged from the upper liquid supply outlet group 9 can be adjusted.

[0025] The existing primary cooler cooling system's process for replenishing condensate in the lower stage is as follows:

[0026] Step S1: Close the valve on the lower section condensate outlet of the primary cooler 1, evacuate the lower section condensate tank 3, and stop the lower section condensate spray pump 4. The liquid level in the lower section condensate tank 3 should remain at around 600 mm.

[0027] Step S2: Stop the upper section condensate spray pump 6, close the control valve on the first upper section liquid supply outlet 901 (the tar content in the tar-ammonia mixture discharged from the first upper section liquid supply outlet 901 is about 5%), close the second upper section liquid supply outlet 902, and open the control valve on the third upper section liquid supply outlet 903 (the tar content in the tar-ammonia mixture discharged from the third upper section liquid supply outlet 901 is about 60%).

[0028] Step S3: Close the inlet valve of the lower section condensate in the primary cooler 1, open the drain valve 7021 on the drain pipe 702, open the replenishment valve on the lower replenishment pipeline 11, start the lower section condensate spray pump 4, and discharge the mixture in the fourth pipeline to the tar ammonia water separation tank 5 through the drain pipe. When a large amount of tar is observed at the vent of the lower section condensate spray pump, stop the lower section condensate spray pump 4, open the replenishment valve 301 on the replenishment and supply port to replenish the lower section condensate tank 3 to 1050 mm, and then close the replenishment valve 301.

[0029] Step S4: Open the control valve on the first upper section liquid supply outlet 901 (the tar content in the tar-ammonia water mixture discharged from the first upper section liquid supply outlet 901 is about 5%), close the control valve on the third upper section liquid supply outlet 903 (the tar content in the tar-ammonia water mixture discharged from the third upper section liquid supply outlet 901 is about 60%), start the lower section condensate spray pump 4, and discharge the mixture in the fourth pipeline to the tar-ammonia water separation tank 5 through the external discharge pipe. When a large amount of ammonia water is observed at the vent of the lower section condensate spray pump, stop the lower section condensate spray pump 4, open the replenishment valve 301 on the replenishment and supply port to replenish the lower section condensate tank 3 to 1500mm, and close the replenishment valve 301 and the replenishment valve to complete the replenishment of the lower section condensate tank 3.

[0030] It should be noted that when the existing primary cooler cooling system is operating normally, the valves of the lower section condensate outlet and the lower section condensate inlet on the primary cooler 1 are in the open state, the external discharge valve 7021 on the external discharge pipe 702 is in the closed state, the liquid replenishment valve on the lower section liquid replenishment pipe 11 is in the closed state, the liquid replenishment valve 301 is in the open state, and the lower section condensate spray pump 4 and the upper section condensate spray pump 6 are both in the open state.

[0031] It should be noted that the above content is only used to illustrate that the improvement of this application is based on the above technical solution, but does not mean that the above technical content is existing technology that is already in a public state.

[0032] As can be seen from the above process, the existing primary cooler cooling system still has the following problems: the workload of replacing the lower section condensate is relatively large, and the liquid replenishment is carried out in two separate steps; the spraying of the upper section condensate needs to be stopped during the replacement of the lower section condensate.

[0033] To address the aforementioned problems, this invention modifies the existing primary cooler cooling system, such as... Figure 1As shown, this embodiment of the invention provides a primary cooler cooling system including a primary cooler 1, a water seal tank 2, a lower condensate tank 3, a lower condensate spray pump 4, a tar-ammonia-water separation tank 5, and an upper condensate spray pump 6. The primary cooler 1 is provided with an upper condensate inlet, a lower condensate inlet, an upper condensate outlet, and a lower condensate outlet. The lower condensate outlet is connected sequentially to the water seal tank 2 and the lower condensate tank 3 via pipelines. Both the lower condensate outlet and the lower condensate inlet are equipped with on / off valves. The lower condensate tank 3 is equipped with... The tank has a dual-purpose inlet for replenishing and supplying liquid, and a replenishment and supply valve 301 is provided on the inlet. The dual-purpose inlet is connected to the lower-section condensate spray pump 4 through a fourth pipeline 13. The lower-section condensate spray pump 4 is connected to the lower-section condensate inlet through a first pipeline 7. The tar-ammonia-water separation tank 5 has a lower-section liquid supply outlet group 8 and an upper-section liquid supply outlet group 9 on the side wall of the tar-ammonia-water separation interface area. The upper-section liquid supply outlet group 9 includes a first upper-section liquid supply outlet 901, a second upper-section liquid supply outlet 902, and a third upper-section liquid supply outlet 902, which are arranged at intervals from top to bottom. The upper section liquid supply outlet 903 is provided. The lower section liquid supply outlet group 8 includes a first lower section liquid supply outlet 801, a second lower section liquid supply outlet 802, a third lower section liquid supply outlet 803, a fourth lower section liquid supply outlet 804, and a fifth lower section liquid supply outlet 805 arranged from top to bottom. Each of the three upper section liquid supply outlets and the five lower section liquid supply outlets is equipped with a control valve (not shown in the figure). The upper section liquid supply outlet group 9 is connected to the upper section condensate spray pump 6 and the upper section condensate inlet in sequence through the third pipeline 12. A second pipeline is led out from the fourth pipeline 13. 10. The second pipeline 10 is connected to the lower section liquid supply outlet group 8. The second pipeline 10 is equipped with a liquid replenishment valve. There is a height difference between the tar ammonia water separation tank 5 and the lower section condensate tank 3 (the tar ammonia water separation tank 5 is located above the lower section condensate tank 3). There is generally a height difference of 5-10m between the lower section liquid supply outlet group 8 of the tar ammonia water separation tank 5 and the liquid replenishment and supply port. The liquid in the lower section liquid supply outlet group 8 of the tar ammonia water separation tank 5 can flow to the liquid replenishment and supply port of the lower section condensate tank 3 under the pressure difference generated by the liquid level difference.

[0034] In addition, the primary cooler 1 of the primary cooler cooling system has a gas inlet at the top and a gas outlet at the bottom. The primary cooler 1 is divided into upper and lower cooling sections. The upper section uses ambient temperature circulating water cooling, and the lower section uses low temperature water cooling. The tar-ammonia-water separation tank 5 has a tar-ammonia-water mixture inlet for receiving the tar-ammonia-water mixture from the coke oven. Upon entering the tar-ammonia-water separation tank 5, the tar-ammonia-water mixture is separated into tar and ammonia water. Due to the higher density of tar, it lies in the lower layer, and ammonia water lies in the upper layer. The tar and ammonia water in the tar-ammonia-water separation tank 5 gradually separate into layers, thus creating a certain temperature difference between the tar layer and the ammonia water layer. The tar-ammonia-water separation interface region has a thickness, and the tar content in the tar-ammonia-water mixture in the tar-ammonia-water separation interface region gradually decreases from top to bottom. Therefore, the tar content in the tar-ammonia-water mixture discharged from the first lower section supply outlet 801, the second lower section supply outlet 802, the third lower section supply outlet 803, the fourth lower section supply outlet 803, and the fifth lower section supply outlet 803 are different, showing an increasing trend in sequence. By controlling the opening and closing of the control valves on the upper and lower section supply outlets, the tar content in the tar-ammonia-water mixture discharged from the lower section supply outlet group 8 and the upper section supply outlet group 9 can be adjusted.

[0035] The improved primary cooler cooling system's process for replenishing the lower stage condensate is as follows:

[0036] Step M1: Close the valve on the lower section condensate outlet of the primary cooler 1, evacuate the lower section condensate tank 3, and then stop the lower section condensate spray pump 4.

[0037] Step M2: Close the control valves on the first lower section liquid supply outlet 801, the fourth lower section liquid supply outlet 804, and the fifth lower section liquid supply outlet 805; open the control valves on the second lower section liquid supply outlet 802 and the third lower section liquid supply outlet 803; open the replenishment valve on the second pipeline 10; open the replenishment valve 301 on the replenishment and supply port to replenish liquid to the lower section condensate tank 3 until it reaches 1500mm; then close the replenishment valve 301.

[0038] It should be noted that when the improved primary cooler cooling system is running normally, the valves of the lower section condensate outlet and the lower section condensate inlet on the primary cooler 1 are in the open state, the external discharge valve 7021 on the external discharge pipe 702 is in the closed state, the liquid replenishment valve on the second pipeline 10 is in the closed state, the liquid supply valve 301 is in the open state, and the lower section condensate spray pump 4 and the upper section condensate spray pump 6 are both in the open state.

[0039] Compared with the prior art, the improvement of the present invention is that a lower section liquid supply outlet group and a control valve are added to the side wall of the tar-ammonia-water separation interface area of ​​the tar-ammonia-water separation tank 5, and a second pipe 10 is led out from the fourth pipe 13 between the liquid supply and replenishment port and the lower section condensate spray pump 4. The second pipe 10 is connected to the lower section liquid supply outlet group, thereby connecting the lower section liquid supply outlet group 8 with the liquid supply and replenishment port on the lower section condensate tank 3; when the primary cooler cooling system of the present invention replenishes the lower section condensate tank 3, it uses the lower section liquid supply outlet group 8 to replenish the lower section condensate tank 3. The opening and closing degree of the control valve on the lower liquid supply outlet can ensure that the mixture discharged from the lower liquid supply outlet group 8 meets the composition requirements of the lower condensate (tar and ammonia water mixture with a tar content of 30-40%). The mixture is then directly introduced into the lower condensate tank 3 through the second pipeline 10 under hydraulic drive, making the operation more convenient and faster. Moreover, during the replenishment process, the tar and ammonia water separation tank 5 can also continuously supply liquid to the upper condensate spray pump 6 through the upper liquid supply outlet group 9, without stopping the spraying of the upper condensate 6, resulting in higher system cooling efficiency.

[0040] Because tar has a higher density than ammonia, tar deposition is likely to occur in the condensate in the lower condensate tank 3 after replacement, making it impossible to guarantee the quality stability of the condensate for a long time. To solve the above problem, in some embodiments of the present invention, a backflushing pipe 701 is led out from the first pipeline 7. The outlet of the backflushing pipe 701 faces upward and extends into the bottom of the lower condensate tank 3. The tar-ammonia mixture sprayed upward from the backflushing pipe 701 can effectively prevent tar deposition at the bottom of the lower condensate tank 3, ensuring that the quality of the condensate in the lower condensate tank 3 meets the usage requirements for a long time. Preferably, a backflushing valve 7011 is provided on the backflushing pipe 701.

[0041] In some embodiments of the present invention, a first sampling tube 131 is led out from the fourth pipeline 13, and a first sampling valve 1311 is provided on the first sampling tube 131. The condensate can be periodically sampled through the first sampling tube 131 to test the quality of the condensate. When the quality of the condensate does not meet the usage requirements, it can be replaced in a timely manner.

[0042] In some embodiments of the present invention, the second pipeline 10 is provided with a second sampling tube 101, and the second sampling tube 101 is provided with a second sampling valve 1011.

[0043] In some embodiments of the present invention, the control valve is a flow regulating valve. The flow regulating valve can precisely control the flow rate of the tar-ammonia-water mixture flowing out from the lower liquid supply outlet and the upper liquid supply outlet, thereby controlling the tar content of the tar-ammonia-water mixture flowing out from the lower liquid supply outlet group 8 and the upper liquid supply outlet group 9.

[0044] To improve the automation level of the system, in some embodiments of the present invention, the primary cooler cooling system further includes a controller, the control valve is an electric valve, and the controller is electrically connected to the control valve, the lower condensate spray pump 4 and the upper condensate spray pump 6 respectively.

[0045] In some embodiments of the present invention, an external drain pipe 702 is led out from the first pipeline 7, and the outlet of the external drain pipe 702 is connected to the tar-ammonia water separation tank 5. An external drain valve 7021 is provided on the external drain pipe 702. After the system has been operating for a relatively long period (e.g., 3 months), in order to ensure the overall quality of the condensate in the lower section of the system, when replenishing the lower section condensate tank 3, the tar-ammonia water mixture that has been standing for a long time in the second pipeline 10 can be recovered through the external drain pipe 702. The specific operation process is as follows:

[0046] Step N1: Close the valve on the lower section condensate outlet of the primary cooler 1, evacuate the lower section condensate tank 3, and then stop the lower section condensate spray pump 4.

[0047] Step N2: Close the control valves on the first lower section liquid supply outlet 801, the fourth lower section liquid supply outlet 804, and the fifth lower section liquid supply outlet 805; open the control valves on the second lower section liquid supply outlet 802 and the third lower section liquid supply outlet 803; open the replenishment valve on the second pipeline 10; close the opening and closing valve of the lower section condensate inlet of the primary cooler 1; open the drain valve 7021 on the drain pipe 702; start the lower section condensate spray pump 4; discharge the mixture in the second pipeline 10 and the fourth pipeline 13 through the drain pipe 702 to the tar ammonia water separation tank 5; after the original mixture in the second pipeline 10 and the fourth pipeline 13 is drained, stop the lower section condensate spray pump 4; open the replenishment valve 301 on the replenishment and supply port to replenish the lower section condensate tank 3 to 1500mm; then close the replenishment valve 301.

[0048] In an embodiment of the present invention, a replenishment pump (not shown in the figure) is provided on the second pipeline 10. The replenishment efficiency can be improved by using the replenishment pump on the second pipeline 10.

[0049] Furthermore, it should be noted that although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A primary cooler cooling system, characterized in that, The system includes a primary cooler (1), a water seal tank (2), a lower condensate tank (3), a lower condensate spray pump (4), a tar-ammonia-water separation tank (5), and an upper condensate spray pump (6). The primary cooler (1) is provided with an upper condensate inlet, a lower condensate inlet, an upper condensate outlet, and a lower condensate outlet. The lower condensate outlet is connected to the water seal tank (2) and the lower condensate tank (3) in sequence through pipelines. The lower condensate outlet is equipped with an on / off switch. The lower section condensate tank (3) is equipped with a liquid supply and replenishment port, and a liquid supply and replenishment valve (301) is provided on the liquid supply and replenishment port. The liquid supply and replenishment port is connected to the lower section condensate spray pump (4) through a fourth pipeline (13). The lower section condensate spray pump (4) is connected to the lower section condensate inlet through a first pipeline (7). The tar ammonia water separation tank (5) has a lower section liquid supply outlet group (8) and an upper section liquid supply outlet group (8) on the side wall of the tar ammonia water separation interface area. The upper section liquid supply outlet group (9) includes at least two lower section liquid supply outlets arranged alternately from top to bottom, and the lower section liquid supply outlet group (8) includes at least two upper section liquid supply outlets arranged alternately from top to bottom. Both the lower and upper section liquid supply outlets are equipped with control valves. The upper section liquid supply outlet group (9) is connected sequentially to the upper section condensate spray pump (6) and the upper section condensate inlet via a third pipeline (12). A second pipeline (10) is led out from the fourth pipeline (13). The second pipeline (10) is connected to the lower section liquid supply outlet group (8). A liquid replenishment valve is provided on the second pipeline (10). There is a height difference between the tar ammonia water separation tank (5) and the lower section condensate tank (3) so that the liquid in the tar ammonia water separation tank (5) flows from the lower section liquid supply outlet group (8) to the liquid replenishment and supply port of the lower section condensate tank (3) under hydraulic drive.

2. The primary cooler cooling system according to claim 1, characterized in that, A backflushing pipe (701) is led out from the first pipeline (7), and the outlet of the backflushing pipe (701) faces upward and extends into the bottom of the lower section condensate tank (3).

3. The primary cooler cooling system according to claim 2, characterized in that, The backwash pipe (701) is equipped with a backwash valve (7011).

4. The primary cooler cooling system according to claim 1, characterized in that, A first sampling tube (131) is led out from the fourth pipeline (13), and a first sampling valve (1311) is provided on the first sampling tube (131).

5. The primary cooler cooling system according to claim 1, characterized in that, The second pipeline (10) is provided with a second sampling tube (101), and the second sampling tube (101) is provided with a second sampling valve (1011).

6. The primary cooler cooling system according to claim 1, characterized in that, The control valve is a flow regulating valve.

7. The primary cooler cooling system according to claim 1, characterized in that, It also includes a controller, wherein the control valve and the opening and closing valve are both electric valves, and the controller is electrically connected to the control valve, the opening and closing valve, the lower section condensate spray pump (4) and the upper section condensate spray pump (6) respectively.

8. The primary cooler cooling system according to claim 1, characterized in that, An external discharge pipe (702) is led out from the first pipeline (7), and the outlet of the external discharge pipe (702) is connected to the tar ammonia water separation tank (5). An external discharge valve (7021) is provided on the external discharge pipe (702).

9. The primary cooler cooling system according to claim 1, characterized in that, A replenishment pump is connected to the second pipeline (10).

10. The primary cooler cooling system according to claim 1, characterized in that, The lower liquid supply outlet group (8) includes 5 lower liquid supply outlets arranged at intervals from top to bottom, and the upper liquid supply outlet group (9) includes 3 upper liquid supply outlets arranged at intervals from top to bottom.

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