Coal gas purification device and processing system

Abstract

The application provides a coal gas purification device and processing system, and relates to coal gas purification. The coal gas purification device comprises a cylinder, a ceramic filter, a first air cap plate, a ceramic heat accumulator, a second air cap plate, a re-cooler, a third air cap plate and an electric tar precipitator which are sequentially arranged in the cylinder along a coal gas purification direction. The cylinder is provided with a raw coal gas inlet, a clean coal gas outlet, a hot air inlet, a hot air outlet and an ash outlet. The raw coal gas inlet is arranged between the lower end of the cylinder and the ceramic filter, the clean coal gas outlet is arranged between the upper end of the cylinder and the electric tar precipitator, the hot air inlet is arranged opposite to the clean coal gas outlet, the hot air outlet is arranged opposite to the raw coal gas inlet, and the ash outlet is arranged at the lower end of the cylinder. The cleaning direction of the hot air is opposite to the coal gas purification direction. The application improves product utilization and reduces pollution.

Description

Technical Field

[0001] This application relates to the field of coal gas purification, and more specifically, to a coal gas purification device and processing system. Background Technology

[0002] With the rapid development of the coking industry, the effective utilization and purification of raw coal gas, as one of the main byproducts of coking, has become a key focus of the industry. During the formation of raw coal gas, a large amount of coal tar-like substances are released. These substances can be classified into light oil and heavy oil based on their volatility, density, and other physical properties, collectively referred to as tar-like deposits. To realize the subsequent utilization of raw coal gas, such as for power generation, hydrogen production, or as feedstock for chemical processes, it is essential to purify the gas to remove particulate matter, sulfides, ammonia, naphthalene, and various oily impurities.

[0003] Existing coal gas purification equipment inevitably accumulates light and heavy oil during operation. Light oil has high fluidity and volatility, while heavy oil has high viscosity and strong adhesion. Both form complex deposits on the inner walls of the equipment, packing layers, heat exchange surfaces, and pipe connections, leading to decreased heat transfer efficiency, reduced flow cross-section, increased pressure drop, and even blockage and corrosion. Currently, the industry commonly uses steam purging, hot water cleaning, or chemical solvent cleaning for cleaning and maintenance of purification equipment. However, these methods suffer from long cleaning cycles, high energy consumption, incomplete cleaning, and the potential for secondary pollution. Especially for complex multi-stage purification systems, the difficulty of oil removal is further increased, seriously affecting the continuous and stable operation of the raw coal gas purification system. Utility Model Content

[0004] The purpose of this application is to provide a gas purification device and processing system that can clean the gas purification device and improve its service life.

[0005] In a first aspect, this utility model provides a coal gas purification device, which includes a cylinder and a ceramic filter, a first air cap plate, a ceramic heat storage body, a second air cap plate, a recooler, a third air cap plate, and an electrostatic precipitator arranged sequentially in the cylinder along the coal gas purification direction. The cylinder is provided with a raw coal gas inlet, a clean coal gas outlet, a hot air inlet, a hot air outlet, and an ash discharge port. The raw coal gas inlet is located between the lower end of the cylinder and the ceramic filter, the clean coal gas outlet is located between the upper end of the cylinder and the electrostatic precipitator, the hot air inlet is opposite to the clean coal gas outlet, the hot air outlet is opposite to the raw coal gas inlet, and the ash discharge port is located at the lower end of the cylinder. The cleaning direction of the hot air is opposite to the coal gas purification direction.

[0006] In an optional embodiment, the gas purification device further includes a first valve, a second valve, a third valve, a fourth valve, and a fifth valve. The first valve is located at the raw gas inlet, the second valve is located at the clean gas outlet, the third valve is located at the hot air inlet, the fourth valve is located at the hot air outlet, and the fifth valve is located at the ash discharge outlet.

[0007] In an optional implementation, when the first valve and the second valve are open, the third valve, the fourth valve, and the fifth valve are closed.

[0008] In an optional embodiment, the cylinder is further provided with a first tar outlet, which is connected to the output port of the first wind cap plate.

[0009] In an optional embodiment, the cylinder is further provided with a second tar outlet and a third tar outlet that are connected to each other. The second tar outlet is connected to the output port of the second wind cap plate, and the third tar outlet is connected to the output port of the third wind cap plate.

[0010] Secondly, this utility model provides a gas processing system, including multiple gas purification devices as described in the foregoing embodiments, wherein the multiple gas purification devices are connected in parallel.

[0011] In an optional embodiment, the gas processing system further includes a tubular furnace, a hot air boiler, a condenser, a first tar transfer tank, and a second tar transfer tank. The tubular furnace is connected to the hot air boiler and the condenser, respectively. The hot air boiler is connected to the hot air inlet. The condenser is connected to the second tar transfer tank. The second tar transfer tank is connected to the second tar outlet and the third tar outlet, respectively. The first tar transfer tank is connected to the first tar outlet and the tubular furnace, respectively.

[0012] In an optional embodiment, the condenser is also connected to the recooler.

[0013] In an optional embodiment, the second tar transfer tank is provided with a naphtha outlet, which is located at the lower end of the second tar transfer tank.

[0014] In an optional embodiment, the tubular furnace is connected to the hot air outlet, and the hot air outlet blows air into the tubular furnace.

[0015] Compared to existing technologies, the beneficial effects of this application are: The gas purification device provided in this application purifies raw coal gas through a ceramic filter, a ceramic heat storage body, a recooler, and an electrostatic precipitator to obtain clean coal gas. Furthermore, this application utilizes the setting of hot air inlet and hot air outlet to achieve self-cleaning of the gas purification device and improve its service life.

[0016] This application also provides a gas processing system, which, through the installation of a tubular furnace, a hot air boiler, a condenser, a first tar transfer tank, and a second tar transfer tank, realizes hot air circulation and cold water circulation, and processes the products of the gas purification device, thereby improving the utilization rate of the products and reducing environmental pollution. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 The diagrams illustrating the gas purification principle of the gas purification device in some embodiments are shown. Figure 2 The backflushing cleaning principle diagram of the gas purification device in some embodiments is shown; Figure 3 The connection diagrams of the gas processing system in some embodiments are shown.

[0019] Explanation of key component symbols: 1-Gas purification device; 10-Cylinder; 11-Raw gas inlet; 12-Clean gas outlet; 13-Hot air inlet; 14-Hot air outlet; 15-Ash discharge port; 16-First tar outlet; 17-Second tar outlet; 18-Third tar outlet; 20-Ceramic filter; 30-First air cap plate; 40-Ceramic heat storage body; 50-Second air cap plate; 60-Recooler; 70-Third air cap plate; 80-Electrostatic precipitator; 2-Tube furnace; 3-Hot air boiler; 4-Condenser; 5-First tar transfer tank; 6-Second tar transfer tank; 7-Blower; a-First valve; b-Second valve; c-Third valve; d-Fourth valve; e-Fifth valve. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0022] 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] Example 1 This embodiment applies to the purification of raw coal gas. Raw coal gas refers to coal gas containing dust. It cannot be directly supplied to users and must undergo dust removal treatment. This is because the furnace dust in the raw coal gas may not only clog pipelines during transportation, but also, due to the alkaline substances in the furnace dust, may fuse with acidic refractory materials (slagging) under high-temperature conditions during combustion, thereby reducing the performance and service life of equipment such as coke oven combustion chambers and hot blast stove regenerators.

[0026] Please see Figures 1 to 3 This embodiment provides a gas purification device 1, which includes a cylinder 10 and a ceramic filter 20, a first air cap plate 30, a ceramic heat storage body 40, a second air cap plate 50, a recooler 60, a third air cap plate 70 and an electrostatic precipitator 80 arranged sequentially in the cylinder 10 along the gas purification direction.

[0027] The cylinder 10 is provided with a raw coal gas inlet 11, a clean coal gas outlet 12, a hot air inlet 13, a hot air outlet 14, and an ash discharge port 15. The raw coal gas inlet 11 is located between the lower end of the cylinder 10 and the ceramic filter 20. The clean coal gas outlet 12 is located between the upper end of the cylinder 10 and the electrostatic precipitator 80. The hot air inlet 13 is opposite to the clean coal gas outlet 12. The hot air outlet 14 is opposite to the raw coal gas inlet 11. The ash discharge port 15 is located at the lower end of the cylinder 10. The cleaning direction of the hot air is opposite to the coal gas purification direction.

[0028] The raw coal gas purification process is as follows: After the raw coal gas enters the cylinder 10 through the raw coal gas inlet 11, it passes through the ceramic filter 20, the first air cap plate 30, the ceramic heat storage body 40, the second air cap plate 50, the recooler 60, the third air cap plate 70 and the electrostatic precipitator 80, and then outputs clean coal gas from the clean coal gas outlet 12.

[0029] The backflushing cleaning process of the gas purification device 1 is as follows: hot air enters the cylinder 10 from the hot air inlet 13, passes through the electrostatic precipitator 80, the third air cap plate 70, the recooler 60, the second air cap plate 50, the ceramic heat storage body 40, the first air cap plate 30 and the ceramic filter 20, and is output from the hot air outlet 14.

[0030] Therefore, this embodiment can clean all components with accumulated tar deposits, improve the cleaning coverage, and ensure the stable operation of the gas purification device 1.

[0031] In this embodiment, the opening directions of the hot air inlet 13 and the clean gas outlet 12 are perpendicular to the axial direction of the cylinder 10, and the opening directions of the hot air outlet 14 and the raw gas inlet 11 are perpendicular to the axial direction of the cylinder 10.

[0032] This embodiment uses valves to control the on / off state of each position.

[0033] Specifically, the gas purification device 1 also includes a first valve a, a second valve b, a third valve c, a fourth valve d, and a fifth valve e. The first valve a is located at the raw gas inlet 11, the second valve b is located at the clean gas outlet 12, the third valve c is located at the hot air inlet 13, the fourth valve d is located at the hot air outlet 14, and the fifth valve e is located at the ash discharge outlet 15.

[0034] When raw coal gas is purified, valves a and b are open, while valves c, d, and e are closed. When backflushing is performed, valves a, b, and e are closed, while valves c and d are open. When oil and ash are discharged, valve e is open, while valves a, b, c, and d are closed. In other words, coal gas purification, backflushing, and oil and ash discharge are performed in staggered phases.

[0035] The cylinder 10 is also provided with a first tar outlet 16, which is connected to the output port of the first wind cap plate 30. The first tar outlet 16 is used to output heavy component tar.

[0036] The cylinder 10 is also provided with a second tar outlet 17 and a third tar outlet 18 that are connected to each other. The second tar outlet 17 is connected to the output port of the second hood plate 50, and the third tar outlet 18 is connected to the output port of the third hood plate 70. The second tar outlet 17 and the third tar outlet 18 are used to output light component tar.

[0037] In the raw coal gas purification process, after the high-temperature raw coal gas enters the cylinder 10, the dust in the raw coal gas is initially removed by the action of gravity and centrifugal force. Then, the dust is further removed by the ceramic filter 20. After passing through the first wind cap plate 30, the coal gas is introduced into the ceramic heat storage body 40, where it absorbs heat and cools down, causing the heavy tar components in the coal gas to condense and precipitate. The heavy tar components fall back and are collected at the outlet of the first wind cap plate 30. The coal gas continues to rise and passes through the second wind cap plate 50 before entering the recooler 60, where it is cooled a second time to condense and precipitate the light tar components. The light tar components fall back and are collected at the outlet of the second wind cap plate 50, where the electrostatic precipitator 80 completes the efficient capture and recovery of the light tar components. The light tar components fall back and are collected at the outlet of the third wind cap plate 70. The purified coal gas is then transported to the coal gas desulfurization process through the clean coal gas outlet 12 for desulfurization and combustion.

[0038] The ash and slag collected by gravity, centrifugal force, and filtration dust removal are discharged from the ash discharge port 15, and the residual carbon in the ash and slag is transferred to subsequent processes for recycling. In this embodiment, the ash discharge port 15 can be configured to discharge the ash and slag through a rotary unloader.

[0039] Among them, the ceramic filter 20 is selected as a special ceramic filter 20 to meet the working conditions of high temperature and high corrosion.

[0040] A special high-efficiency ceramic regenerator 40 and a recooler 60 are used for staged dry cooling and condensation separation of tar from coal gas, avoiding the drawbacks of wet rapid cooling that produces large amounts of oily and phenolic wastewater. Using the high-efficiency ceramic regenerator 40 for the first stage of cooling avoids the corrosion problem of phenols and pyridines in the condensed heavy tar components adhering to the heat exchange tubes, which occurs when using traditional heat exchangers for the first stage of heat exchange.

[0041] Furthermore, the high-efficiency ceramic regenerator 40 has the advantages of higher heat recovery efficiency, less tar adhesion, and easier cleaning. Using the heat recovered by the ceramic regenerator 40 to heat and process heavy tar avoids the risk of large amounts of heavy tar entering the gasifier and causing furnace deterioration, which is present in gasification reactor technology. This process transforms tar into easily marketable and high-value-added naphtha and modified bitumen products, improving resource utilization efficiency and avoiding potential back-end system operation problems and safety hazards caused by secondary condensation of light tar mixed with coal gas during gasification.

[0042] The recooler 60 uses circulating cooling water for indirect heat exchange with the coal gas. The electrostatic precipitator 80 uses electrons generated by the ionization of a high-voltage DC electric field to collide with tar droplets, making them charged. Then, the droplets are adsorbed onto the electrode tube by the electric field force, thus completing the collection of tar in the coal gas.

[0043] The gas purification device 1 provided in this embodiment purifies raw coal gas through a ceramic filter 20, a ceramic heat storage body 40, a recooler 60, and an electrostatic precipitator 80 to obtain clean coal gas. In addition, this embodiment utilizes the setting of hot air inlet 13 and hot air outlet 14 to achieve self-cleaning of the gas purification device 1 and improve its service life.

[0044] Example 2 Please see Figures 1 to 3 During the gas purification process, tar and dust will adhere to the cylinder wall and various components, requiring regular cleaning to ensure the stable operation of the gas purification device 1. To ensure the continuity of gas purification, improvements are made in this embodiment.

[0045] Based on the above embodiments, this embodiment provides a gas processing system, which includes multiple gas purification devices 1 as described in the above embodiments, and the multiple gas purification devices 1 are connected in parallel.

[0046] This embodiment uses three gas purification devices 1 connected in parallel as an example. The three gas purification devices 1 perform gas purification, backflushing cleaning, and oil and ash removal at staggered time periods. For example, the first gas purification device 1 performs gas purification, the second gas purification device 1 performs backflushing cleaning, and the third gas purification device 1 performs oil and ash removal.

[0047] For example: after the first gas purification device 1 completes the gas purification, the next step (backflushing cleaning) is carried out. After the backflushing cleaning is completed, oil and ash are discharged.

[0048] The gas processing system also includes a tubular furnace 2, a hot air boiler 3, a condenser 4, a first tar transfer tank 5, and a second tar transfer tank 6. The tubular furnace 2 is connected to the hot air boiler 3 and the condenser 4, respectively. The hot air boiler 3 is connected to the hot air inlet 13. The condenser 4 is connected to the second tar transfer tank 6. The second tar transfer tank 6 is connected to the second tar outlet 17 and the third tar outlet 18, respectively. The first tar transfer tank 5 is connected to the first tar outlet 16 and the tubular furnace 2, respectively.

[0049] Condenser 4 is also connected to recooler 60.

[0050] The second tar transfer tank 6 is equipped with a naphtha outlet, which is located at the lower end of the second tar transfer tank 6.

[0051] The tubular furnace 2 is connected to the hot air outlet 14, and the hot air outlet 14 blows air into the tubular furnace 2. In this embodiment, a fan 7 is installed between the tubular furnace 2 and the hot air outlet 14 to achieve the purpose of blowing air.

[0052] Specifically, the blower 7 is started, and a stream of moderately warm air enters the cylinder 10 from the hot air inlet 13. This air softens, decomposes, removes, and cleans the adhering substances from top to bottom. As it passes the ceramic heat storage body 40, it absorbs and carries away the heat from the ceramic heat storage body 40, restoring it to a low temperature for later use in cooling the raw coal gas. After absorbing heat, the backflushing hot air exits from the hot air outlet 14 and enters the tubular furnace 2 to heat the heavy tar components in the first tar transfer tank 5. During heating, an ignition element is used to ignite the combustible components generated by the gasification of a small amount of low-component tar during cleaning in the backflushing hot air. After exiting the tubular furnace 2, the hot air enters the hot air boiler 3 to heat the softened water and produce steam. The hot air temperature then returns to its initial suitable temperature, and the cycle begins again for the next self-cleaning process.

[0053] In the tubular furnace 2, the heavy component tar is heated and pressurized for a certain period of time. The low-boiling-point components are distilled and vaporized, and then cooled and condensed by the condenser 4 and collected into the low component coal tar. Together with the low component tar collected during the purification process, it is sold as naphtha. The high-boiling-point components and a small amount of low-boiling-point heterocyclic components polymerize to form asphalt, which is sold as modified asphalt. The steam generated by the hot air boiler 3 is used as a heat source for other processes.

[0054] When the heat storage capacity of the ceramic heat storage body 40 approaches saturation, the temperature of the clean gas outlet 12 begins to rise. By switching valves, the gas purification node is switched to backflushing cleaning, oil and ash discharge, thereby reducing the temperature of the ceramic heat storage body 40 in preparation for the next gas purification cycle. This cycle continues.

[0055] The entire process employs dry dust removal and dry tar removal, utilizing gravity and centrifugal dust removal, along with filtration to ensure dust removal efficiency. Hot air backflushing keeps the ceramic filter 20 clean for long-term operation, further achieving dry separation of ash and slag. This solves the problem in wet washing dust removal where the washing liquid simultaneously absorbs heat from the coal gas, causing coal tar and dust to be absorbed by the washing liquid at the same time, resulting in difficulty in separating "dust-oil-water" and generating hazardous waste and resource waste.

[0056] The air intake section of the purification device uses a specially designed structure to enhance the effects of gravity and centrifugal dust removal, while also preventing the ash and slag that fall off the ceramic filter 20 from being carried into the high-temperature hot air.

[0057] Since this embodiment includes the gas purification device 1 provided in the above embodiments, this embodiment has all the advantages of the above embodiments, and this embodiment also has the following advantages: 1) The process is simple, resource utilization is high, and it is safe and environmentally friendly. The purification of raw coal gas and the processing of tar are carried out simultaneously and rapidly. Through segmented and graded separation, dust, heavy tar, and light tar in the coal gas are fully separated and collected. While delivering clean coal gas, all tar components are collected and processed into naphtha and modified asphalt, which can be directly sold and have high added value. The collected ash is also dry powder, meaning that coal ash that was pulverized by impact and friction in the gasifier and carried out with the coal gas without participating in the conversion can be directly recycled to the briquette workshop or fly ash workshop for use. This achieves full utilization of valuable resources while eliminating the generation of difficult-to-treat wastewater, waste oil, waste residue, and hazardous waste.

[0058] 2) Excellent purification effect: Gravity and centrifugal dust removal combined with a 20-stage ceramic filter ensures effective dust removal. A 40-stage ceramic heat exchanger and a 60-stage recooler provide two-stage cooling, allowing both light and heavy coal tar components in the gas to fully condense and separate. An 80-stage electrostatic precipitator at the top ensures the complete capture and recovery of the precipitated light coal tar components. The gas exiting the purification unit only needs desulfurization to fully meet the standards for use in the downstream system. The alternating operation of gas purification and hot air cleaning processes eliminates the drawback of traditional online steam purging purification devices, which introduce water vapor into the gas, reducing its calorific value and quality.

[0059] 3) Stable operation: Hot air purging removes adhering dust and tar, ensuring the cleanliness of each unit of the purification device for long-term operation. Cleaning does not require furnace shutdown or manual operation; the cycle of "purification work - oil and slag discharge - backflushing cleaning" is automatically completed through the control program. In areas prone to high-temperature damage and corrosion, all purification units are temperature and corrosion resistant, ensuring the equipment's service life.

[0060] 4) Energy saving and efficiency improvement: The heat source used for cleaning the hard-to-clean attached tar by hot air blowing, the heat source for heating and processing the heavy coal tar, and the heat source for heating soft water to output steam all come from the heat of high-temperature coal gas absorbed and stored by the high-efficiency ceramic heat storage body 40. No additional external heat source is required, realizing the recovery and utilization of the sensible heat of high-temperature coal gas that other technologies do not have.

[0061] The gas processing system provided in this embodiment, through the arrangement of tubular furnace 2, hot air boiler 3, condenser 4, first tar transfer tank 5 and second tar transfer tank 6, realizes hot air circulation and cold water circulation, and processes the products of gas purification device 1, thereby improving the utilization rate of products and reducing environmental pollution.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A gas purification device, characterized in that, The device includes a cylinder and, sequentially arranged within the cylinder along the gas purification direction, a ceramic filter, a first air cap plate, a ceramic heat storage body, a second air cap plate, a recooler, a third air cap plate, and an electrostatic precipitator. The cylinder has a raw coal gas inlet, a clean coal gas outlet, a hot air inlet, a hot air outlet, and an ash discharge port. The raw coal gas inlet is located between the lower end of the cylinder and the ceramic filter, the clean coal gas outlet is located between the upper end of the cylinder and the electrostatic precipitator, the hot air inlet is opposite to the clean coal gas outlet, the hot air outlet is opposite to the raw coal gas inlet, and the ash discharge port is located at the lower end of the cylinder. The cleaning direction of the hot air is opposite to the gas purification direction.

2. The gas purification device as described in claim 1, characterized in that, It also includes a first valve, a second valve, a third valve, a fourth valve, and a fifth valve. The first valve is located at the raw coal gas inlet, the second valve is located at the clean coal gas outlet, the third valve is located at the hot air inlet, the fourth valve is located at the hot air outlet, and the fifth valve is located at the ash discharge outlet.

3. The gas purification device as described in claim 2, characterized in that, When the first valve and the second valve are open, the third valve, the fourth valve and the fifth valve are closed.

4. The gas purification device according to any one of claims 1 to 3, characterized in that, The cylinder is also provided with a first tar outlet, which is connected to the output port of the first wind cap plate.

5. The gas purification device as described in claim 4, characterized in that, The cylinder is also provided with a second tar outlet and a third tar outlet that are connected to each other. The second tar outlet is connected to the output port of the second wind cap plate, and the third tar outlet is connected to the output port of the third wind cap plate.

6. A gas processing system, characterized in that, It includes multiple gas purification devices as described in claim 5, wherein multiple gas purification devices are connected in parallel.

7. The gas processing system as described in claim 6, characterized in that, It also includes a tubular furnace, a hot air boiler, a condenser, a first tar transfer tank and a second tar transfer tank. The tubular furnace is connected to the hot air boiler and the condenser, respectively. The hot air boiler is connected to the hot air inlet. The condenser is connected to the second tar transfer tank. The second tar transfer tank is connected to the second tar outlet and the third tar outlet. The first tar transfer tank is connected to the first tar outlet and the tubular furnace, respectively.

8. The gas processing system as described in claim 7, characterized in that, The condenser is also connected to the recooler.

9. The gas processing system as described in claim 7, characterized in that, The second tar transfer tank is equipped with a naphtha outlet, which is located at the lower end of the second tar transfer tank.

10. The gas processing system as described in claim 7, characterized in that, The tubular furnace is connected to the hot air outlet, and the hot air outlet blows air into the tubular furnace.

Images