An online dredging method and device for a gas recovery pipeline

Abstract

The application discloses an online dredging method and device for a raw coal gas recovery treatment pipeline. The method comprises the following steps: ① keeping the blowdown pipeline near the air blower always open; ② first introducing steam into the coal gas pipeline from the blowdown pipeline, opening all the blowdown pipelines after the steam is introduced for 5-20 minutes; ③ then introducing ammonia water into the coal gas pipeline from the electric precipitation rear coal gas pipeline sampling port, closing the first blowdown pipeline after the ammonia water is washed for 0.8-1.2 hours, and continuously introducing steam; ④ opening the first blowdown pipeline every 0.8-1.2 hours after the steam is heated, discharging accumulated slag once, and until the temperature of the coal gas pipeline at the first oil discharge pipeline is uniformly increased; ⑤ increasing the steam amount when the ammonia water temperature is insufficient, and supplementing heat for the ammonia water; ⑥ the blowdown mode of other positions is as described in steps ①-⑤; and ⑦ after each pipeline is washed for 12 hours, ammonia water is introduced into the water seal tank of the air blower for 12 hours. The application can dredge in time when the conveying pipeline is seriously blocked, and ensures continuous and stable conveying of the raw coal gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coke oven auxiliary equipment, in particular to an online dredging method and device for a coke oven gas recovery pipeline. BACKGROUND

[0002] The coke oven gas generated by the coke oven is introduced to the gas-liquid separator through the gas collecting pipe, and after separating most of the mixed liquid, it is cooled to 19-23 DEG C in the primary cooler, most of the naphthalene, coal powder and other impurities in the scrubbing gas are sprayed in the primary cooler, and then most of the tar mist is removed by the electric trap, and then it is transported to the subsequent processing section by the air blower.

[0003] During operation, as the use time accumulates, the spraying effect of the primary cooler will gradually deteriorate, at this time, the gas temperature after the primary cooler is high, and the impurities in the gas are more, such gas enters the electric trap, and the electric trap is easy to be blocked, so that the effect of removing tar is poor.

[0004] The impurities enter the air blower gas pipeline with the gas, and long-term impurity accumulation can cause serious gas pipeline blockage and large resistance, resulting in low suction before the primary cooler, air blower adjustment difficulty and other problems, which cannot meet the normal transportation of coke oven gas, and further cause coke oven gas to be discharged at the top. Moreover, as a downstream process of coking, the coke oven gas recovery needs to be continuously operated for 24 hours, and the gas pipeline cannot be processed alone.

[0005] However, in the prior art, such as the manganese-rich slag electric furnace coke oven gas recovery system and coke oven gas recovery process with the application publication number CN 103305653 A, the electric furnace exhaust port is connected with the cooling device and the water-cooled cyclone in sequence, and is sent to the rotary kiln by the gas pressurizing fan without wet dust removal, and is directly used safely without purification treatment. At the same time, the manganese element is recovered, the environmental pollution is reduced, and the electric furnace coke oven gas is effectively recovered and utilized. However, the coke oven gas recovery pipeline lacks self-dredging function, and cannot dredge itself when the recovery pipeline is blocked, so as to ensure the normal transportation of coke oven gas.

[0006] In order to solve the above technical problems, the present application provides an online dredging method and device for a coke oven gas recovery pipeline. SUMMARY

[0007] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide an online dredging method and device for a coke oven gas recovery pipeline, which can dredge in time when the pipeline is seriously blocked, ensure the continuous and stable transportation of coke oven gas, avoid the discharge of coke oven gas at the top of the coking furnace, and stabilize the operation of the recovery system.

[0008] In order to achieve the above purpose, the present application provides the following technical scheme:

[0009] An online dredging method for a raw coal gas recovery treatment pipeline, comprising the following steps:

[0010] ① The blowers are kept open near the blowdown pipeline;

[0011] ② Steam is first introduced into the coal gas pipeline from the blowdown pipeline, all blowdown pipelines are opened after 5-20 minutes of steam introduction, the upper blockage of the coal gas pipeline is removed by the steam, and meanwhile, the blowdown passage is ensured to be unobstructed;

[0012] ③ Ammonia water is then introduced into the coal gas pipeline from the sampling port of the post-electricity capture coal gas pipeline, the lower blockage impurities of the coal gas pipeline are melted by the ammonia water, the blockage impurities flow with the ammonia water, the first blowdown pipeline is closed after 0.8-1.2 hours of ammonia water flushing, and the steam continues to be introduced;

[0013] ④ The first blowdown pipeline is opened every 0.8-1.2 hours of steam heating, and the accumulated slag is discharged at one time until the temperature of the coal gas pipeline at the first blowdown pipeline is uniformly increased;

[0014] ⑤ The steam amount is increased when the temperature of the ammonia water is not enough, and the heat of the ammonia water is supplemented;

[0015] ⑥ The blowdown mode of other positions is as described in steps ①-⑤;

[0016] ⑦ The water seal tank of the blower is replaced by ammonia water for 12 hours every 12 hours of pipeline flushing.

[0017] Another object of the present application discloses an online dredging device for realizing online dredging effect of a raw coal gas recovery pipeline by using the above online dredging method, comprising an electricity capture, a blower, a water seal tank of the blower, an ammonia water flushing pipe and an oil discharge pipe; the water seal tank of the blower is connected with the blower through a pipeline, and the oil discharge pipe is connected with the water seal tank of the blower through a pipeline;

[0018] The electricity capture and the blower are connected through a coal gas pipeline; a sampling port of a post-electricity capture coal gas pipeline is connected with the ammonia water flushing pipe, the ammonia water flushing pipe is connected with an ammonia water supply main pipe, and the ammonia water supply main pipe is used for injecting ammonia water into the coal gas pipeline;

[0019] The coal gas pipeline is provided with a pressure tapping, and the pressure tapping is connected with the oil discharge pipe provided with an oil discharge valve; a steam purging valve is arranged on the oil discharge pipe, the steam purging valve is connected with a steam supply main pipe, steam is input into the coal gas pipeline through the oil discharge pipe, the steam is gaseous and has a high flow rate, the steam flows with the waste gas in the coal gas pipeline and stays for a short time, the steam can drive the upper blockage of the pipeline, the oil discharge pipe is ensured to be unobstructed, and the flushing liquid and impurities can be smoothly discharged through the oil discharge pipe;

[0020] The temperature of the ammonia water itself is high, reaching 50-70 DEG C, the hot ammonia water can melt the tar, coal powder, naphthalene and other impurities blocked in the gas pipeline, and then improve the flowability and solubility of the tar, coal powder, naphthalene and other impurities, and then discharged to the water seal tank of the blower through the oil discharge pipe, and then realize the online dredging of the gas pipeline between the electric trap and the blower, and a small part of heat will be lost in the flow process of the ammonia water, if the temperature of the ammonia water during the flushing process does not reach 50 DEG C, the ammonia water can be heated by adjusting the amount of steam during the flow process, so as to ensure the flushing effect of the ammonia water.

[0021] Preferably, the electric trap is provided with two, respectively first electric trap and second electric trap, the blower is provided with two, respectively first blower and second blower, the first electric trap and the second electric trap are converged to the main pipeline through the first branch pipeline and the second branch pipeline, the main pipeline is divided into the third branch pipeline and the fourth branch pipeline, the third branch pipeline and the fourth branch pipeline are connected with the first blower and the second blower respectively; the ammonia water flushing pipe is provided with two, respectively first ammonia water flushing pipe and second ammonia water flushing pipe, the first ammonia water flushing pipe is connected with the sampling port of the gas pipeline after the first electric trap, the second ammonia water flushing pipe is connected with the sampling port of the gas pipeline after the second electric trap.

[0022] Preferably, the oil discharge pipe is provided with four, respectively first oil discharge pipe, second oil discharge pipe, third oil discharge pipe and fourth oil discharge pipe; the first oil discharge pipe and the second oil discharge pipe converge into the first total oil discharge pipe, the third oil discharge pipe and the fourth oil discharge pipe converge into the second total oil discharge pipe; the first total oil discharge pipe and the second total oil discharge pipe are connected with the water seal tank of the blower; the steam purge valve is provided with four, respectively first steam purge valve, second steam purge valve, third steam purge valve and fourth steam purge valve, corresponding to the first oil discharge pipe, the second oil discharge pipe, the third oil discharge pipe and the fourth oil discharge pipe respectively.

[0023] Preferably, the first branch pipeline and the second branch pipeline are cross pipes, and the main pipeline is first a cross pipe and then an inclined pipe.

[0024] Preferably, the first oil discharge pipe is arranged at the convergence of the first branch pipeline, the second branch pipeline and the main pipeline, a pressure tapping at the convergence of the first branch pipeline, the second branch pipeline and the main pipeline is connected with the first oil discharge pipe, the second oil discharge pipe is arranged on the inclined pipe of the main pipeline, a pressure tapping on the inclined pipe of the main pipeline is connected with the second oil discharge pipe, the third oil discharge pipe is arranged at the connection of the inclined pipe of the main pipeline and the third branch pipeline, a pressure tapping at the connection of the inclined pipe of the main pipeline and the third branch pipeline is connected with the third oil discharge pipe, and the fourth oil discharge pipe is arranged at the blower inlet pipeline of the third branch pipeline, a pressure tapping at the blower inlet pipeline of the third branch pipeline is connected with the fourth oil discharge pipe, which can more accurately dredge the blocked pipeline and has good dredging effect.

[0025] Preferably, an observation hole is arranged on the water seal tank of the blower for observing the liquid level in the water seal tank.

[0026] Preferably, the first branch pipe is provided with a fifth oil unloading pipe, and the first branch pipe is connected to the fifth oil unloading pipe with a pressurized opening. The fifth oil unloading pipe is provided with a fifth steam purging valve, which is connected to the steam supply main pipe. The fifth oil unloading pipe is connected to the blower water seal tank. The fifth oil unloading pipe serves as an alternative oil unloading channel and can accurately clean the gas pipeline after the first electrostatic precipitator.

[0027] Preferably, the second branch pipe is provided with a sixth oil unloading pipe, and the second branch pipe is connected to the sixth oil unloading pipe with a pressurized opening. The sixth oil unloading pipe is provided with a sixth steam purging valve, which is connected to the steam supply main pipe. The sixth oil unloading pipe is connected to the blower water seal tank. The sixth oil unloading pipe serves as an alternative oil unloading pipe and can accurately clean the gas pipeline after the second electrostatic precipitator.

[0028] Specifically, the third unloading pipe is always kept open to prevent ammonia from entering the first blower;

[0029] First, purge the pipelines near the unloading pipes with steam through each steam purging valve for 5-10 minutes. Then, open the valves of each unloading pipe, ensuring all steam purging valves are open. Purge the gas sampling port of the first electrostatic precipitator with ammonia water for 0.8-1.2 hours. After rinsing, close the valve of the first unloading pipe, keeping all steam purging valves open. Slightly purge steam through the first unloading pipe. After steam heating for 0.8-1.2 hours, open the first unloading pipe to discharge accumulated sludge once, until the gas pipeline temperature at the first unloading pipe rises to a uniform level. The unclogging methods for the second and fourth unloading pipes are as described above.

[0030] Ammonia water was alternately introduced into the sampling ports of the first and second electrostatic precipitators for gas, and the pipelines were flushed according to the above steps until the pipeline temperatures rose to the same level.

[0031] After flushing the pipeline for 12 hours daily, replace the blower water seal tank with ammonia water for 12 hours to prevent sludge buildup at the bottom of the pipeline.

[0032] Typically, gas pipelines are designed with a 5% slope based on the direction of medium flow. Ammonia water is introduced from the sampling port of the gas pipeline after electrostatic precipitator, which can clear the blockage from the source of the gas pipeline along with the gas flow, thereby achieving comprehensive pipeline clearing.

[0033] Because steam has a short residence time, its unblocking effect is worse than that of ammonia. The main purpose of introducing steam is to carry away the blockages in the upper layer of the gas pipeline with the flow of gas, and at the same time to make the unloading pipe unobstructed, so as to ensure that the flushing fluid and blockages are discharged smoothly through the unloading pipe.

[0034] The ammonia water is introduced from the coal gas pipeline sampling port of the electric trap, and flows along the direction of the coal gas under the self-flowing property, and melts and removes the blockage in the lower part of the pipeline during the flowing of the ammonia water, thereby achieving the purpose of dredging the pipeline.

[0035] The ammonia water has a high temperature of 50-70 DEG C, and can gradually melt the blockage during the flushing, thereby removing and discharging the blockage from the oil discharge pipe.

[0036] The present application has the following advantages:

[0037] The present application introduces the ammonia water flushing pipe, the oil discharge pipe and the steam purging valve on the coal gas pipeline between the electric trap and the blower, keeps the oil discharge smooth by steam, mixes the ammonia water with the tar, coal powder, naphthalene and other impurities in the pipeline, improves the flowability and solubility of the tar, coal powder, naphthalene and other impurities by the temperature of the ammonia water, and accelerates the removal of the tar, coal powder, naphthalene and other impurities through the oil discharge pipe to the water seal tank of the blower by the momentum of the ammonia water, thereby achieving the online dredging of the coal gas pipeline between the electric trap and the blower.

[0038] The present application supplements the heat of the ammonia water by steam to ensure the dredging effect of the ammonia water on the blockage in the coal gas pipeline.

[0039] The present application can dredge the pipeline in time when the pipeline is seriously blocked, ensure the continuous and stable delivery of the raw coal gas, avoid the emission of the raw coal gas from the coking oven, and stabilize the operation of the recovery system. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative labor.

[0041] Figure 1 It is a schematic diagram of the pipeline connection of the present application.

[0042] In the figure, 1 is a first electric trap, 2 is a second electric trap, 3 is a first blower, 4 is a second blower, 5 is a first ammonia water flushing pipe, 6 is a second ammonia water flushing pipe, 7 is a blower water seal tank, 8 is a first oil discharge pipe, 9 is a second oil discharge pipe, 10 is an observation hole, 11 is a first steam purging valve, 12 is a second steam purging valve, 13 is a third steam purging valve, 14 is a third oil discharge pipe, 15 is a fourth oil discharge pipe, and 16 is a fourth steam purging valve. EMBODIMENT

[0043] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0044] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0045] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] like Figure 1 As shown, an online dredging method for a raw coal gas recovery and treatment pipeline includes the following steps:

[0048] ① Keep the sewage pipes near the blower open at all times;

[0049] ② First, introduce steam into the gas pipeline from the sewage pipe. After introducing steam for 5 to 20 minutes, open all sewage pipes. The steam will carry away the blockages in the upper part of the gas pipeline and ensure that the sewage channel is unobstructed.

[0050] ③ Then, ammonia water is introduced into the gas pipeline from the sampling port of the gas pipeline after electrostatic precipitation. The ammonia water dissolves the blockage impurities in the lower layer of the gas pipeline, causing the blockage impurities to flow with the ammonia water. After flushing with ammonia water for 0.8~1.2 hours, the first sewage pipe is closed and steam is continued to flow.

[0051] ④ After steam heating for 0.8 to 1.2 hours, open the first drain pipe to discharge the accumulated slag once, until the temperature of the gas pipe at the first drain pipe rises to a uniform level;

[0052] ⑤When the temperature of the ammonia water is not enough, increase the amount of steam to supplement the heat of the ammonia water;

[0053] ⑥The other position of the blowdown mode is as described in steps ①-⑤;

[0054] ⑦After each flushing pipeline 12h, the water seal tank of the blower is replaced with ammonia water for 12h.

[0055] An online unblocking device for realizing online unblocking effect of raw coal gas recovery pipeline by using the above online unblocking method, comprising an electric trap, a blower, a blower water seal tank, an ammonia water flushing pipe, and an oil discharge pipe; the blower water seal tank is connected with the blower through a pipeline, and the oil discharge pipe is connected with the blower water seal tank through a pipeline;

[0056] The electric trap and the blower are connected through a gas pipeline; a sampling port of the gas pipeline after the electric trap is connected with the ammonia water flushing pipe, and the ammonia water flushing pipe is connected with an ammonia water supply main pipe for injecting ammonia water into the gas pipeline;

[0057] The gas pipeline is provided with a pressure tapping hole, and is connected with the oil discharge pipe provided with an oil discharge valve; a steam purging valve is arranged on the oil discharge pipe, and is connected with a steam supply main pipe; steam is input into the gas pipeline through the oil discharge pipe; since the steam is in gaseous state and has a high flow rate, it flows with the waste gas in the gas pipeline and stays for a short time, which can drive the blockage on the upper layer of the pipeline, ensure the smoothness of the oil discharge pipe, and ensure that the flushing liquid and impurities can be smoothly discharged through the oil discharge pipe;

[0058] The temperature of the ammonia water is relatively high, reaching 50-70℃; the hot ammonia water can melt the tar, coal powder, naphthalene, and other impurities blocked in the gas pipeline, thereby improving the flowability and solubility of the tar, coal powder, naphthalene, and other impurities; then the impurities are discharged to the blower water seal tank through the oil discharge pipe, thereby realizing online unblocking of the gas pipeline between the electric trap and the blower; a small part of heat is lost in the flow process of the ammonia water; if the temperature of the ammonia water during the flushing process does not reach 50℃, the ammonia water can be heated by adjusting the amount of steam in the flow process, thereby ensuring the flushing effect of the ammonia water.

[0059] Preferably, the electric trap is provided with two electric traps 1 and 2, and the blower is provided with two blowers 3 and 4; the first electric trap 1 and the second electric trap 2 are connected to a main pipeline through first and second branch pipelines; the main pipeline is divided into third and fourth branch pipelines, and the third and fourth branch pipelines are connected with the first and second blowers 3 and 4, respectively; the ammonia water flushing pipe is provided with two ammonia water flushing pipes 5 and 6; the first ammonia water flushing pipe 5 is connected with the sampling port of the gas pipeline after the first electric trap 1, and the second ammonia water flushing pipe 6 is connected with the sampling port of the gas pipeline after the second electric trap 2.

[0060] Preferably, the oil discharge pipe is provided with four, namely the first oil discharge pipe 8, the second oil discharge pipe 9, the third oil discharge pipe 14 and the fourth oil discharge pipe 15; the first oil discharge pipe 8 and the second oil discharge pipe 9 are merged into the first total oil discharge pipe, and the third oil discharge pipe 14 and the fourth oil discharge pipe 15 are merged into the second total oil discharge pipe; the first total oil discharge pipe and the second total oil discharge pipe are connected with the blower water seal tank 7; the steam purging valve is provided with four, namely the first steam purging valve 11, the second steam purging valve 12, the third steam purging valve 13 and the fourth steam purging valve 16, which correspond to the first oil discharge pipe 8, the second oil discharge pipe 9, the third oil discharge pipe 14 and the fourth oil discharge pipe 15 respectively.

[0061] Preferably, the first branch pipe and the second branch pipe are horizontal pipes, and the total pipe is first a horizontal pipe and then an inclined pipe.

[0062] Preferably, the first oil discharge pipe 8 is arranged at the junction of the first branch pipe, the second branch pipe and the total pipe, a pressure tapping at the junction of the first branch pipe, the second branch pipe and the total pipe is connected with the first oil discharge pipe 8, the second oil discharge pipe 9 is arranged on the inclined pipe of the total pipe, a pressure tapping on the inclined pipe of the total pipe is connected with the second oil discharge pipe 9, the third oil discharge pipe 14 is arranged at the junction of the inclined pipe of the total pipe and the third branch pipe, a pressure tapping at the junction of the inclined pipe of the total pipe and the third branch pipe is connected with the third oil discharge pipe 14, and the fourth oil discharge pipe 15 is arranged at the blower inlet pipeline on the third branch pipe, a pressure tapping at the blower inlet pipeline on the third branch pipe is connected with the fourth oil discharge pipe 15. Such arrangement can more accurately dredge the blocked pipeline and has good dredging effect.

[0063] Preferably, the blower water seal tank 7 is provided with an observation hole for observing the liquid volume in the water seal tank.

[0064] Preferably, the first branch pipe is provided with a fifth oil discharge pipe 18, a pressure tapping on the first branch pipe is connected with the fifth oil discharge pipe 18, the fifth oil discharge pipe 18 is provided with a fifth steam purging valve 17, the fifth steam purging valve 17 is connected with the steam supply main pipe, the fifth oil discharge pipe 18 is connected with the blower water seal tank 7, and the fifth oil discharge pipe 18 serves as an alternative oil discharge passage and can accurately clean the coal gas pipeline after the first electric precipitator 1.

[0065] Preferably, the second branch pipe is provided with a sixth oil discharge pipe 20, a pressure tapping on the second branch pipe is connected with the sixth oil discharge pipe 20, the sixth oil discharge pipe 20 is provided with a sixth steam purging valve 19, the sixth steam purging valve 19 is connected with the steam supply main pipe, and the sixth oil discharge pipe 20 is connected with the blower water seal tank 7. The sixth oil discharge pipe 20 serves as an alternative oil discharge pipe and can accurately clean the coal gas pipeline after the second electric precipitator 2.

[0066] Specifically, the third oil discharge pipe 14 is always kept in an open state to prevent ammonia water from entering the first blower 3.

[0067] First, purge the pipelines near the unloading pipes with steam through each steam purging valve for 5-10 minutes. Then, open the valves of each unloading pipe, ensuring all steam purging valves are open. Purge the gas pipeline sampling port after the first electrostatic precipitator 1 with ammonia water for 0.8-1.2 hours. Then, close the valve of the first unloading pipe 8, keeping all steam purging valves open. Slightly purge steam through the first unloading pipe 8. After steam heating for 0.8-1.2 hours, open the first unloading pipe 8 to discharge the accumulated slag once, until the gas pipeline temperature at the first unloading pipe 8 rises to a uniform level. The unclogging methods for the second unloading pipe 9 and the fourth unloading pipe 15 are as described above.

[0068] Ammonia water was alternately introduced into the sampling ports of the gas pipelines of the first electrostatic precipitator 1 and the second electrostatic precipitator 2. The pipelines were flushed according to the above steps until the pipeline temperature rose to a uniform level.

[0069] After flushing the pipeline for 12 hours daily, replace the blower water seal tank 7 with ammonia water for 12 hours to prevent sludge buildup at the bottom of the pipeline.

[0070] Typically, gas pipelines are designed with a 5% slope based on the direction of medium flow. Ammonia water is introduced from the sampling port of the gas pipeline after electrostatic precipitator, which can clear the blockage from the source of the gas pipeline along with the gas flow, thereby achieving comprehensive pipeline clearing.

[0071] Because steam has a short residence time, its unblocking effect is worse than that of ammonia. The main purpose of introducing steam is to carry away the blockages in the upper layer of the gas pipeline with the flow of gas, and at the same time to make the unloading pipe unobstructed, so as to ensure that the flushing fluid and blockages are discharged smoothly through the unloading pipe.

[0072] Ammonia water is introduced into the sampling port of the gas pipeline after electrostatic precipitation. The ammonia water flows with the direction of gas flow due to its own fluidity. During the flow of ammonia water, the ammonia water melts and carries away the blockages that have been deposited in the lower part of the pipeline for a long time, thereby achieving the purpose of unblocking the pipeline.

[0073] Ammonia water itself has a high temperature, reaching 50~70℃. During flushing, it can gradually melt the blockage and carry it away from the unloading pipe. When the temperature of ammonia water is below 50℃, the steam input can be adjusted during the flow of ammonia water to heat the ammonia water and improve its unblocking ability.

[0074] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An online dredging method for pipelines used in the recovery and treatment of raw coal gas, characterized in that: The system includes an electrostatic precipitator, a blower, a blower water seal tank, an ammonia flushing pipe, and an oil unloading pipe. The electrostatic precipitator and the blower are connected via a gas pipeline. The blower water seal tank is connected to the blower via a pipeline, and the oil unloading pipe is connected to the blower water seal tank via a pipeline. A sampling port on the gas pipeline after electrostatic precipitation is connected to the ammonia flushing pipe, which is connected to the main ammonia supply pipe. The gas pipeline has a pressurized opening connected to an oil unloading pipe with a built-in oil unloading valve. The oil unloading pipe is equipped with a steam purging valve connected to the main steam supply pipe. Two electrostatic precipitators are installed, designated as a first electrostatic precipitator and a second electrostatic precipitator. Two blowers are installed, designated as a first blower and a second blower. The first and second electrostatic precipitators converge onto a main pipeline via a first branch pipe and a second branch pipe. The main pipeline then branches into a third branch pipe and a fourth branch pipe, which are connected to the first and second blowers, respectively. There are four unloading pipes: the first unloading pipe, the second unloading pipe, the third unloading pipe, and the fourth unloading pipe. The first and second unloading pipes merge to form the first main unloading pipe, and the third and fourth unloading pipes merge to form the second main unloading pipe. Both the first and second main unloading pipes are connected to the blower water seal trough. There are four steam purging valves: the first steam purging valve, the second steam purging valve, the third steam purging valve, and the fourth steam purging valve, corresponding one-to-one with the first, second, third, and fourth unloading pipes. The first and second branch pipes are horizontal pipes, and the main pipe is initially a horizontal pipe and then an inclined pipe. The first unloading pipe is located at the junction of the first and second branch pipes and the main pipe. The second unloading pipe is located on the inclined pipe of the main pipe. The third unloading pipe is located at the connection between the inclined pipe of the main pipe and the third branch pipe. The fourth unloading pipe is located on the blower inlet pipe of the third branch pipe. And includes the following steps: ① Keep the oil unloading pipe near the blower open. ② First, introduce steam into the gas pipeline from the oil unloading pipe. After introducing steam for 5-20 minutes, open all oil unloading pipes. ③ Then, ammonia water is introduced into the gas pipeline from the sampling port of the gas pipeline after electrostatic precipitation. After flushing with ammonia water for 0.8~1.2 hours, the first unloading pipe is closed and steam is continued to be introduced. ④ After steam heating for 0.8 to 1.2 hours, open the first unloading pipe to discharge the accumulated slag once, until the temperature of the gas pipeline at the first unloading pipe rises to a uniform level; ⑤ When the temperature of ammonia water is below 50℃, increase the amount of steam to supplement the heat of the ammonia water; ⑥ Other methods for draining the oil unloading pipe are as described in steps ① to ⑤; ⑦ After flushing the pipeline for 12 hours, replace the blower water seal tank with ammonia water for 12 hours.

2. The online unblocking method according to claim 1, characterized in that: The blower water seal groove is provided with an observation hole.

3. The online unblocking method according to claim 1, characterized in that: Two ammonia flushing pipes are provided, namely a first ammonia flushing pipe and a second ammonia flushing pipe. The first ammonia flushing pipe is connected to the sampling port of the first electrostatic precipitator gas pipeline, and the second ammonia flushing pipe is connected to the sampling port of the second electrostatic precipitator gas pipeline.

4. The online unblocking method according to claim 1, characterized in that: The pressurized opening at the junction of the first and second branch pipes with the main pipe connects to the first unloading pipe. The pressurized opening on the inclined pipe of the main pipe connects to the second unloading pipe. The pressurized opening at the junction of the inclined pipe of the main pipe and the third branch pipe connects to the third unloading pipe. The pressurized opening at the blower inlet line of the third branch pipe connects to the fourth unloading pipe.

5. The online unblocking method according to claim 4, characterized in that: The first branch pipe is equipped with a fifth oil unloading pipe, and the first branch pipe has a pressurized opening connected to the fifth oil unloading pipe. The fifth oil unloading pipe is equipped with a fifth steam purging valve, which is connected to the steam supply main pipe. The fifth oil unloading pipe is connected to the blower water seal tank.

6. The online unblocking method according to claim 4, characterized in that: The second branch pipe is equipped with a sixth oil unloading pipe. The second branch pipe has a pressurized opening connected to the sixth oil unloading pipe. The sixth oil unloading pipe is equipped with a sixth steam purging valve. The sixth steam purging valve is connected to the steam supply main pipe. The sixth oil unloading pipe is connected to the blower water seal tank.

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