Cold drum system primary cooler emulsion spray washing device

Abstract

This utility model discloses an emulsion spraying and washing device for a primary cooler in a cooling drum system, comprising a gas-liquid separator, a mechanized clarification tank connected to the gas-liquid separator, and an emulsion pump connected to the mechanized clarification tank. The emulsion pump is connected to an upper condensate tank via a first branch pipe, and to a lower condensate tank via a second branch pipe. The upper and lower condensate tanks are connected to the primary cooler. The upper condensate tank is connected to an upper condensate pump. The upper condensate pump is connected to an upper spray liquid branch pipe of the primary cooler via a third branch pipe. The lower condensate tank is connected to a lower condensate pump. The lower condensate pump is connected to a lower spray liquid branch pipe of the primary cooler via a fourth branch pipe. The upper and lower condensate pumps are connected to a raw coal gas pipeline before the gas-liquid separator. The emulsion spraying and washing device for the primary cooler of the cold drum system of this utility model directly delivers the emulsion to the upper and lower sections without temperature drop through the emulsion pump, thereby achieving stable high-pressure spraying of the upper and lower spray pipes. This can more thoroughly remove the tar and carbon powder deposited on the primary cooler tube bundle and the bottom of the tank, thus improving the washing effect.

Description

Technical Field

[0001] This utility model belongs to the field of chemical engineering technology. Specifically, this utility model relates to a spray washing device for emulsion in the primary cooler of a cooling drum system. Background Technology

[0002] In coking and coal chemical production processes, hot coal gas containing tar, coke dust, and impurities requires preliminary cooling and washing to reduce the load on downstream processes (such as desulfurization and deammoniation) and prevent tar, naphthalene, and dust from depositing on equipment surfaces, leading to decreased heat exchange efficiency or even blockages. The cooling drum system, as a core device in the coal gas purification process, typically removes tar particles and condensable substances from the coal gas through spray washing media (usually tar-ammonia emulsion or coal gas condensate). Traditional cooling drum systems often rely on condensate generated by the coal gas itself as the washing media, using gravity or simple pipelines to distribute sprays across the upper and lower sections of multiple primary coolers. However, this often suffers from uneven spraying, insufficient washing power, and localized coke buildup and blockages.

[0003] In existing technologies, common sources of washing media include hot ammonia and crude tar from mechanized clarifiers (hereinafter referred to as mechanized tanks) or independently installed circulating pump systems. While the hot ammonia and crude tar from mechanized clarifiers can be circulated using process liquids, the temperature and impurity concentration of these washing liquids vary significantly. Furthermore, pipeline distribution is limited by site space and equipment location, making precise flow control of each cooling drum unit difficult. In addition, when multiple primary coolers operate in parallel, the lack of reliable flow distribution and pressure balancing methods easily leads to some primary coolers spraying excessively while others spray insufficiently. Relying solely on natural pipeline branching makes flexible adjustments for different operating conditions impossible and hinders maintenance. If nozzles become clogged with tar or carbon powder, cleaning is inconvenient and can easily affect the stable operation of the entire system.

[0004] In cold seasons or when production load fluctuates greatly, the temperature of the washing medium is too low, which will cause tar particles to solidify prematurely in the pipeline, resulting in local blockage of the pipeline. Under high load or high tar concentration conditions, the scouring force of the washing liquid from the mechanization tank is insufficient, which leads to the accelerated deposition of tar on the inner wall of the primary cooler. This not only reduces heat exchange efficiency and increases the resistance of the primary cooler, but also shortens the equipment maintenance cycle and increases operating costs.

[0005] Chinese Patent Application No. 202110562207.8 discloses an emulsion preparation spraying system, including an oil circuit system, a water circuit system, an emulsification system, and a spraying system; the inlet end of the oil circuit system is connected to an oil supply device, and the outlet end of the oil circuit system is connected to the oil inlet end of the emulsification system; the inlet end of the water circuit system is connected to a water supply device, the outlet end of the water circuit system is connected to the water inlet end of the emulsification system, and the outlet end of the emulsification system is connected to the inlet end of the spraying system; the outlet end of the spraying system is provided with a spraying beam. Utility Model Content

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a spray washing device for the emulsion in the primary cooler of a cooling drum system, with the purpose of improving the washing effect.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a primary cooler emulsion spraying and washing device for a cooling drum system, comprising a gas-liquid separator, a mechanized clarification tank connected to the gas-liquid separator, and an emulsion pump connected to the mechanized clarification tank. The emulsion pump is connected to the upper condensate tank via a first branch pipe, and to the lower condensate tank via a second branch pipe. The upper and lower condensate tanks are connected to the primary cooler. The upper condensate tank is connected to the upper condensate pump. The upper condensate pump is connected to the upper spray liquid branch pipe of the primary cooler via a third branch pipe. The lower condensate tank is connected to the lower condensate pump. The lower condensate pump is connected to the lower spray liquid branch pipe of the primary cooler via a fourth branch pipe. The upper and lower condensate pumps are connected to the raw coal gas pipeline before the gas-liquid separator.

[0008] The mechanized clarification tank is connected to the inlet of the emulsion pump via a filter pipeline, and a filter is installed in the filter pipeline.

[0009] The filter is a Y-type screen filter with a mesh size of 50-200 mesh.

[0010] The gas-liquid separator is connected to the raw coal gas pipeline. The upper condensate pump and the lower condensate pump are connected to the liquid return branch. A liquid return pipe is installed in the liquid return branch. The liquid return pipe is connected to the nozzle. The nozzle is connected to the raw coal gas pipeline.

[0011] The nozzles are provided in multiple locations.

[0012] The gas-liquid separator is connected to the primary cooler.

[0013] A static mixer is installed on the fourth branch pipe.

[0014] The emulsion spraying and washing device for the primary cooler of the cold drum system of this utility model directly delivers the emulsion to the upper and lower sections without temperature drop through the emulsion pump, thereby achieving stable high-pressure spraying of the upper and lower spray pipes. This can more thoroughly remove the tar and carbon powder deposited on the primary cooler tube bundle and the bottom of the tank, thus improving the washing effect. Attached Figure Description

[0015] This manual includes the following figures, which illustrate the following:

[0016] Figure 1 This is a schematic diagram of the structure of the emulsion spraying and washing device for the primary cooler of the cold drum system of this utility model;

[0017] Figure 2 This is a schematic diagram of the filter pipeline structure;

[0018] Figure 3 This is a schematic diagram showing the connection between the liquid return pipe and the raw coal gas pipeline;

[0019] The diagram is marked as follows:

[0020] 1. Gas-liquid separator; 2. Mechanized clarifier; 3. Emulsion pump; 4. Upper condensate tank; 5. Lower condensate tank; 6. Primary cooler; 7. Upper condensate pump; 8. Upper spray branch pipe of primary cooler; 9. Lower condensate pump; 10. Lower spray branch pipe of primary cooler; 11. Filter; 12. Bypass valve; 13. Raw coal gas pipeline; 14. Liquid return pipe; 15. Nozzle; 16. Static mixer; 17. Tar-ammonia-water mixture pipe; 18. Emulsion outlet valve; 19. Liquid return spare pipe. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.

[0022] It should be noted that in the following embodiments, the terms "first", "second", "third" and "fourth" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution, but are merely for the convenience of description.

[0023] like Figure 1As shown, this utility model provides a spray washing device for emulsion in the primary cooler of a cooling drum system, including a gas-liquid separator 1, a mechanized clarification tank 2 connected to the gas-liquid separator 1, and an emulsion pump 3 connected to the mechanized clarification tank 2. The emulsion pump 3 is connected to an upper condensate tank 4 via a first branch pipe, and to a lower condensate tank 5 via a second branch pipe. The upper condensate tank 4 and the lower condensate tank 5 are connected to the primary cooler 6. The upper condensate tank 4... The upper condensate pump 7 is connected to the upper spray liquid branch pipe 8 of the primary cooler via a third branch pipe. The lower condensate tank 5 is connected to the lower condensate pump 9, which is connected to the lower spray liquid branch pipe 10 of the primary cooler via a fourth branch pipe. The upper spray liquid branch pipe 8 of the primary cooler is located above the lower spray liquid branch pipe 10 of the primary cooler. The upper condensate pump 7 and the lower condensate pump 9 are connected to the raw coal gas pipeline 13 before the gas-liquid separator 1. The gas-liquid separator 1 is connected to the primary cooler 6, and the raw coal gas discharged from the gas-liquid separator 1 enters the primary cooler 6.

[0024] Specifically, such as Figure 1 As shown, the emulsion spraying and washing device for the primary cooler of the cooling drum system provided by this utility model can achieve efficient, stable delivery and precise distribution of emulsion spraying in the upper and lower sections of the primary cooler 6 in the cooling drum system, thereby effectively improving the heat exchange efficiency of the primary cooler 6, reducing tar and dust deposition, reducing the resistance of the primary cooler 6, and extending the service life of the equipment.

[0025] like Figure 1 As shown, the emulsion spraying and washing device for the primary cooler of the cooling drum system provided by this utility model utilizes the pre-reserved liquid intake port in the middle of the mechanized clarification tank 2 to uniformly collect the emulsion. By adding two emulsion pumps 3 and corresponding pipes, valves, and filters 11, the emulsion is stably transported to the upper tank, lower tank, upper spraying system, and lower spraying system of each primary cooler 6, thereby achieving:

[0026] ① Improve the washing efficiency and overall heat exchange performance of the primary cooler 6;

[0027] ② Ensure that multiple primary coolers 6 are sprayed with emulsion simultaneously or in separate units (groups);

[0028] ③Remote adjustment of the emulsion volume for each primary cooler and single-unit flushing function;

[0029] ④ Reduce maintenance difficulty, reduce coking and blockage, and reduce resistance of the primary cooler;

[0030] ⑤ Reduce the clogging of the spray pipe at the top of the primary cooler 6.

[0031] like Figure 1As shown, the raw coke oven gas is sent from the coke oven to the gas-liquid separator 1 through the raw gas pipeline 13. In the gas-liquid separator 1, the gas and the tar-ammonia water mixture condensed in the gas are separated by gravity sedimentation. The tar-ammonia water mixture is collected at the bottom of the gas-liquid separator 1 and sent to the inlet of the mechanized clarification tank 2. In the mechanized clarification tank 2, sedimentation separation is carried out for at least 30 minutes. The upper part is ammonia water, the lower part is tar, and the middle part is tar-ammonia water emulsion.

[0032] like Figure 1 and Figure 2 As shown, the mechanized clarifier 2 is connected to the inlet of the emulsion pump 3 via a filter pipeline, in which a filter 11 is installed. Two to three interfaces of different heights are connected at the middle height of the tail end of each mechanized clarifier 2. These interfaces converge to form the tar-ammonia emulsion outlet pipe for that mechanized clarifier 2. The emulsion outlet pipe in the middle of the mechanized clarifier 2 is then combined with the outlet pipes of other mechanized clarifier 2 and connected to the filter 11. The filter 11 is connected to the inlet of the emulsion pump 3. After the outlet of the emulsion pump 3, the main pipe branches into four branch pipes.

[0033] The first branch pipe is connected to the upper condensate tank 4 and is used to replenish the emulsion to the upper condensate tank 4.

[0034] The second branch pipe is connected to the lower section condensate tank 5 and is used to replenish the emulsion to the lower section condensate tank 5; the second branch pipe and the first branch pipe can also be two branch pipes that are opened from the first main pipe.

[0035] The third branch pipe is the upper section emulsion spray main pipe connected to the outlet pipe of the upper section condensate circulation pump. Each branch pipe of this main pipe is connected to the upper section spray liquid branch pipe 8 of each primary cooler. It is used to directly replenish the emulsion to the upper section of each primary cooler to assist in the upper section cleaning or to clean it with emulsion alone.

[0036] The fourth branch pipe leads to the outlet pipe of the lower section condensate circulation pump. It mixes with the circulating spray liquid pumped by the lower section condensate pump 9 through the static mixer 16 located on the lower section condensate spray main pipe to ensure that the oil content in the lower section circulating spray liquid reaches between 30% and 50%.

[0037] Emulsion is added to the primary cooler 6 by emulsion pump 3, so that the oil content of the circulating spray liquid in the upper section of the primary cooler 6 reaches between 10% and 30% under normal conditions.

[0038] like Figure 1As shown, a static mixer 16 is installed on the fourth branch pipe. The emulsion is mixed with the lower section condensate through the static mixer 16, which can stabilize the outlet pressure of the emulsion pump 3 and the lower section condensate pump 9. At the same time, it can make the oil content of the lower section circulating spray condensate more stable and uniform. Moreover, the direct mixing with the condensate tank can increase the temperature of the circulating spray liquid, which is beneficial for better spraying and cleaning of the primary cooler 6.

[0039] The first and second branch pipes mentioned above are generally replenished intermittently. The third and fourth branch pipes, on the other hand, are generally replenished continuously.

[0040] The primary cooler 6 is a two-stage indirect cooler with a broken tower plate. Gas can flow from the upper section of the primary cooler 6 to the lower section through the broken tower plate. The condensate accumulated above the broken tower plate cannot enter the lower section of the primary cooler 6 and can only flow by gravity to the upper condensate tank 4. If there is excess condensate in the upper section, it can be automatically discharged to the raw gas pipeline 13 in front of the gas-liquid separator 1 through the branch pipe of the outlet pipe of the upper condensate pump 7 via a valve through the return pipe. When there is excess condensate in the lower section, the lower condensate pump 9 also uses the same pipe to return the raw gas pipeline 13 in front of the gas-liquid separator 1.

[0041] like Figure 1 and Figure 3 As shown, the gas-liquid separator 1 is connected to the raw coal gas pipeline 13, the upper condensate pump 7 and the lower condensate pump 9 are connected to the liquid return branch, the liquid return branch is provided with a liquid return pipe 14, the liquid return pipe 14 is connected to the nozzle 15, the nozzle 15 is connected to the raw coal gas pipeline 13, and multiple nozzles 15 are provided.

[0042] The excess condensate in the primary cooler 6 (including the emulsion sprayed into the primary cooler) is called the return liquid. This return liquid enters the raw coal gas pipeline 13 before the gas-liquid separator 1. It can be sprayed through nozzles 15 to partially exchange heat with the raw coal gas, lowering the raw coal gas temperature while raising the temperature of the return liquid, thus facilitating the separation of tar and ammonia. The selected nozzles 15 can be pagoda-type nozzles or non-clogging spiral nozzles.

[0043] The upper condensate pump 7 and the lower condensate pump 9 are connected to the inlet of the mechanized clarifier 2 through the liquid return backup pipe 19. When the liquid return common pipe has a problem, the liquid return backup pipe 19 can be used to directly return the liquid to the inlet of the mechanized clarifier 2.

[0044] A check valve is installed on the return flow pipeline to prevent raw coal gas from entering the return flow branch before the gas-liquid separator 1 in the event of a sudden pump stop, which could cause a risk.

[0045] Other waste liquids besides the condensate from the primary cooler 6, such as the venting liquid from the underground tanks in the cold drum area, the venting liquid from the cold blower and electrostatic precipitator underground tanks, concentrated and diluted ammonia water from salt extraction, and the venting liquid from the underground venting tanks of the oil depot, normally enter the raw coal gas pipeline 13 before the gas-liquid separator 1 via the return liquid return pipe. This is to reduce the temperature of the liquid in the mechanized clarifier 2 after this part of the room temperature liquid enters the mechanized clarifier 2, which is conducive to the separation of tar and ammonia water, and also to directly enter the mechanized clarifier 2 to reduce the temperature of the circulating ammonia water, as the latter's temperature reduction is not conducive to the cooling effect of the circulating ammonia water on the raw coal gas. Other waste liquids entering the mechanized clarifier 2 are returned to the inlet of the mechanized clarifier 2 via the return liquid return backup pipe 19 when the return liquid return pipe is under maintenance or malfunctioning.

[0046] Example

[0047] like Figure 1 As shown, at the emulsion reserved liquid inlet in the middle of the mechanized clarification tank 2, two liquid inlet pipes (DN250) are connected to two emulsion pumps 3 respectively.

[0048] Three selection parameters for each emulsion pump: flow rate 250m³ / h 3 / h, head 50m, outlet pipe diameter DN200, pump body and pipe material is 304 stainless steel.

[0049] A Y-type screen filter 11 with a mesh size of 50 mesh is installed before the inlet of the emulsion pump 3 to intercept large particles of tar residue and other impurities, so as to avoid clogging of the subsequent pump body and spray pipeline.

[0050] The DN200 main outlet pipe of the emulsion pump 3 branches to:

[0051] The upper spray main pipe (DN125) branches out into 5 DN80 branch pipes, which are respectively connected to the upper spray branch pipes of 5 primary coolers.

[0052] The lower section replenishment main pipe (DN150) is used to replenish emulsion to the lower section circulating spray main pipe of the primary cooler;

[0053] The upper and lower condensate tank 5 replenishment pipe (DN150) is used for replenishing the upper and lower condensate tank 5 of the primary cooler.

[0054] Backup branch (a DN150 flange can be reserved for future expansion or modification).

[0055] The connection method with each primary cooler 6 is as follows:

[0056] (1) Upper spraying system:

[0057] On the upper section of the main spray pipe DN125, lay a branch pipe (DN80) for each of the 5 primary coolers in the order of arrangement. Install a ball valve with remote adjustment (electric or pneumatic control valve) before the branch pipe, and arrange the spray pipeline and nozzles after the valve.

[0058] The orifice diameter of the spray pipes in the upper and lower sections of each primary cooler is φ5~16mm. A larger orifice diameter is used in the latter section of the spray pipe to ensure that the spray pipe is not easily blocked.

[0059] (2) Upper and lower tank replenishment system:

[0060] Two DN100 branch pipes are branched from the DN150 main liquid supply pipe to the upper condensate tank 4 and lower condensate tank 5 of the primary cooler. The branch pipe valves can be electric butterfly valves for liquid supply, which are generally kept closed. The corresponding valve is only opened when the tar content in the lower condensate tank 5 is detected to be below 10%, at which point the electric butterfly valve for supplying liquid to the lower condensate tank 5 needs to be opened. When the tar content in the upper condensate tank 4 is detected to be below 5%, the electric butterfly valve for supplying liquid to the upper condensate tank 4 is opened to replenish liquid.

[0061] (3) Lower section spraying system:

[0062] The DN150 main spray pipe for the lower section is directly connected to the outlet main pipe of the lower section condensate pump 9. It is connected to the main spray pipe of the lower section through the static mixer 16. The amount of emulsion sent into the lower section can reach about 120 m3 / h, so as to directly increase the tar content in the spray liquid of the lower section through direct mixing.

[0063] On the main outlet pipe of the lower pump, a branch pipe of DN100 to DN200 is installed as a return flow pipe 14. The return flow pipe delivers the liquid to the raw coal gas pipeline 13 at the inlet of the gas-liquid separator 1. The cleaning holes on the raw coal gas pipeline 13, specifically the reducing cleaning holes with an inner diameter of D89mm × D108mm, are used. These holes are originally used for cleaning the bottom of the raw coal gas pipeline 13 before the gas-liquid separator 1. If there is tar residue or coal / coke powder clogging the bottom, the cleaning hole cover can be opened for cleaning. In this embodiment, 4 to 6 cleaning holes are selected, using DN80 × D108mm diameter pipes. A 100mm reducer is installed as a return pipe 14 to return the liquid to the gas-liquid separator 1. This reduces the problem of insufficient settling and stratification time of the tar-ammonia-water mixture in the mechanized clarifier 2 caused by directly returning the liquid to the mechanized clarifier 2. At the same time, returning the liquid to the gas-liquid separator 1 helps the liquid absorb some of the heat from the raw coal gas, reducing the cooling load on the subsequent primary cooler 6. It also ensures that the overall temperature of the liquid after mixing with the tar-ammonia-water mixture does not drop much. Furthermore, since it is not directly returned to the mechanized clarifier 2, it facilitates the separation of the tar-ammonia-water mixture in the mechanized clarifier 2.

[0064] Each emulsion pump 3 requires a 50-mesh Y-type filter 11 with a support frame at its inlet. Valves and steam backwashing pipes are installed before and after the filter 11. If the Y-type filter 11 becomes clogged, it can be backwashed directly with hot steam or hot water, reducing the odor problem caused by direct disassembly. The backwash wastewater returns to the inlet of the mechanized clarification tank 2. During the cleaning of the Y-type filter 11, a bypass can be opened without affecting the operation of the emulsion pump 3. Alternatively, two Y-type filters 11 can be used, one in operation and one on standby, with the other running while one is being cleaned.

[0065] The above-described cooling drum system's primary cooler emulsion spray washing device has the following effects:

[0066] 1. Washing efficiency is significantly improved;

[0067] The emulsion pump 3 delivers the liquid directly to the upper and lower sections without temperature drop, achieving stable high-pressure spraying of the upper and lower spray pipes, which can more thoroughly remove the tar and carbon powder deposited on the primary cooler tube bundle and the bottom of the tank.

[0068] Compared to traditional methods that rely on the natural distribution of condensate, this method uses a higher rinsing temperature and a more uniform rinsing coverage area, reducing localized coking on the tube bundle surface.

[0069] 2. Enhanced equipment operational stability;

[0070] The filter 11 works in conjunction with the cleaning port to effectively intercept and discharge large particulate impurities, reducing the frequency of nozzle 15 and pipe clogging. When the filter 11 becomes clogged, it can be backflushed with hot water or steam, thus avoiding the environmental odor problem caused by disassembling the filter 11, while also reducing the labor intensity of workers and improving the working environment.

[0071] The lower section cleaning and return design allows the sludge to flow back to the raw gas pipeline 13 and the mechanized clarification tank 2 in front of the gas-liquid separator 1 immediately, without lingering in the pipeline, thus reducing the risk of sudden shutdown.

[0072] 3. Reduced maintenance costs and downtime;

[0073] The manual or automatic valve branch design allows for the shutdown and maintenance of a single primary cooler without affecting the overall system operation, thus avoiding a complete production stoppage.

[0074] The regular inspection and cleaning process is simple, the replacement of nozzle 15 and the cleaning of filter 11 are quick, and the filter 11 adopts closed cleaning, which reduces manual input and is conducive to environmental improvement.

[0075] 4. Extended equipment lifespan;

[0076] Efficient flushing reduces tar buildup, keeps heat exchange surfaces clean, reduces corrosion and thermal stress, and extends the lifespan of the primary cooler and pipelines.

[0077] The filter protects the pump, spray pipes, and nozzles 15 from impacts by large particles, reducing mechanical wear.

[0078] 5. Flexible response to various working conditions;

[0079] Both the upper and lower branch pipes can be manually switched on and off or adjusted independently, allowing for simultaneous spraying across the entire line, or single-unit or segmented flushing to meet the needs of different production loads.

[0080] When the liquid level in the mechanized clarifier 2 drops or the emulsion concentration changes, the flow rate of each branch valve can be adjusted manually or automatically to quickly respond to fluctuations in operating conditions.

[0081] 6. Resource conservation and environmental benefits;

[0082] The lower return pipeline returns excess emulsion and cleaned mixed slurry to the mechanized clarification tank 2 through the gas-liquid separator 1, realizing liquid recycling and low-cost separation, and reducing the consumption of fresh water and chemical agents.

[0083] Highly efficient washing reduces tar loss and the load on downstream processing systems, contributing to overall environmental compliance.

[0084] 7. It can effectively reduce the resistance of the primary cooler, decreasing it from 2000Pa to approximately 600Pa, thereby significantly saving the power consumption of the blower. Simultaneously, it reduces the risk of environmental accidents such as coke oven venting caused by increased pressure in the coke oven gas collecting pipe due to increased primary cooler resistance.

[0085] 8. Other waste liquids that originally entered the mechanized clarification tank 2, such as the venting liquid from the underground tank of the cold blower area, the venting liquid from the underground tank of the cold blower, the concentrated and dilute ammonia water for salt extraction, and the venting liquid from the underground venting tank of the oil depot, are instead diverted to the raw coal gas pipeline 13 before entering the gas-liquid separator 1 via the return liquid return pipeline. This reduces the temperature of the liquid in the mechanized clarification tank 2 after this part of the room temperature liquid enters the mechanized clarification tank 2, which is beneficial to the separation of tar and ammonia water, and reduces the impact of the temperature drop of ammonia water on the cooling of raw coal gas.

[0086] 9. Install a check valve on the return flow pipeline to prevent the risk of raw coal gas from the gas-liquid separator 1 entering the return flow pipeline when the pump is suddenly stopped.

[0087] 10. The emulsion is mixed with the lower section condensate through the static mixer 16, which can stabilize the outlet pressure of the emulsion pump 3 and the lower section condensate pump 9. At the same time, it can make the oil content of the lower section circulating spray condensate more stable and uniform. Furthermore, the direct mixing ratio with the condensate tank can increase the temperature of the circulating spray liquid, which is beneficial for better spraying and cleaning of the primary cooler.

[0088] 11. This utility model is particularly suitable for the gas primary cooling process of the original design with a mechanized tar ammonia water separation tank. At the same time, it also has certain reference value for the gas primary cooling process of the currently popular vertical tar ammonia water separator process, such as using a filter 11 before the emulsion pump 3, using a static mixer 16 when the emulsion pipe and the lower section circulating spray pipe merge, adjusting the liquid outlet according to the oil content of the emulsion, and setting the liquid return to exchange heat with the raw coal gas, etc.

[0089] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A primary cooler emulsion spraying and washing device for a cooling drum system, characterized in that: It includes a gas-liquid separator, a mechanized clarification tank connected to the gas-liquid separator, and an emulsion pump connected to the mechanized clarification tank. The emulsion pump is connected to the upper condensate tank via a first branch pipe, and to the lower condensate tank via a second branch pipe. The upper and lower condensate tanks are connected to the primary cooler. The upper condensate tank is connected to the upper condensate pump. The upper condensate pump is connected to the upper spray liquid branch pipe of the primary cooler via a third branch pipe. The lower condensate tank is connected to the lower condensate pump. The lower condensate pump is connected to the lower spray liquid branch pipe of the primary cooler via a fourth branch pipe. The upper and lower condensate pumps are connected to the raw coal gas pipeline before the gas-liquid separator.

2. The emulsion spraying and washing device for the primary cooler of the cooling drum system according to claim 1, characterized in that: The mechanized clarification tank is connected to the inlet of the emulsion pump via a filter pipeline, and a filter is installed in the filter pipeline.

3. The emulsion spraying and washing device for the primary cooler of the cooling drum system according to claim 2, characterized in that: The filter is a Y-type screen filter with a mesh size of 50-200 mesh.

4. The emulsion spraying and washing device for the primary cooler of the cooling drum system according to any one of claims 1 to 3, characterized in that: The gas-liquid separator is connected to the raw coal gas pipeline. The upper condensate pump and the lower condensate pump are connected to the liquid return branch. A liquid return pipe is installed in the liquid return branch. The liquid return pipe is connected to the nozzle. The nozzle is connected to the raw coal gas pipeline.

5. The emulsion spraying and washing device for the primary cooler of the cooling drum system according to claim 4, characterized in that: The nozzles are provided in multiple locations.

6. The emulsion spraying and washing device for the primary cooler of the cooling drum system according to any one of claims 1 to 3, characterized in that: The gas-liquid separator is connected to the primary cooler.

7. The emulsion spraying and washing device for the primary cooler of the cooling drum system according to any one of claims 1 to 3, characterized in that: A static mixer is installed on the fourth branch pipe.

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