Coal water slurry gasification crude coal gas anti-blocking scrubbing tower

Abstract

The utility model discloses a water coal slurry gasification coarse coal gas prevents blocking type washing tower, including the tower body with the closed cavity, the tower body is vertically provided with venturi scrubber, and the air inlet of venturi scrubber is fixed in the tower body wall and is connected with the gas pipeline, and the tower body wall still is equipped with the spray water inlet and venturi washing water outlet, and the spray water inlet and venturi washing water outlet are communicated with venturi scrubber through the pipeline, the lower portion of venturi scrubber is provided with the residue separation groove, and the residue separation groove bottom is the black water drain, and the tower body top is provided with the exhaust port, and is provided with a plurality of layers of trays between the exhaust port and venturi scrubber. The utility model solves the plugging problem of water coal slurry washing tower in the stage of opening and parking in the prior art, and reduces the maintenance cost and the security risk.

Description

Technical Field

[0001] This utility model belongs to the field of coal gasification technology, specifically relating to a coal-water slurry gasification crude gas anti-clogging scrubbing tower. Background Technology

[0002] In the coal-water slurry gasification process, the crude gas scrubbing tower is the core equipment for purifying crude gas. Its main function is to remove impurities such as ash, dust, and black water carried in the crude gas, providing clean raw gas for the stable operation of subsequent processes. After the crude gas is generated in the gasifier, the solid ash and liquid black water it carries need to be separated in the scrubbing tower before being discharged through a specific path. Therefore, the design of the scrubbing tower's ash discharge system is crucial for the continuous operation of the equipment.

[0003] In existing technologies, the slag discharge system of washing towers mostly adopts a dual-discharge method: one pipeline connects to the ditch to discharge the black water deposited during the washing process, which contains a large amount of fine ash particles and soluble impurities such as carbon black; the other pipeline connects to the slag pool, specifically for discharging the coarser ash slag separated by sedimentation. Both discharges are controlled by valves, which theoretically can achieve the staged discharge of solid and liquid impurities.

[0004] However, this design has significant shortcomings in actual operation. When the ash and black water in the crude gas mix, a mixture containing a large number of highly viscous fine particles is formed. These fine particles, such as carbon black and fly ash, easily adhere to the inner walls of the pipelines. Especially during start-up and shutdown, the system flow fluctuates greatly and the temperature changes drastically, making these fine particles more prone to rapid deposition and agglomeration at pipe bends, valve sealing surfaces, and other locations. The black water discharge pipeline gradually narrows due to the continuous adhesion of fine particles, while the ash discharge pipeline experiences flow obstruction due to blockage by coarser particles, ultimately leading to frequent blockages in both discharge systems.

[0005] The blockage problem occurs almost every time the plant is started or stopped. This necessitates interrupting production, manually disassembling the blockage plate or valve, and then forcibly clearing the blockage with a high-pressure water jet. This process not only consumes significant manpower and time—often taking several hours or longer for a single clearing operation, severely delaying the feeding schedule—but more importantly, operators come into contact with high-temperature, high-pressure equipment components during disassembly and cleaning, posing safety risks such as burns and mechanical impacts. Furthermore, frequent disassembly exacerbates wear and tear on valves and pipelines, further increasing equipment maintenance costs and becoming a prominent issue hindering the continuous and stable operation of the coal-water slurry gasification unit. Utility Model Content

[0006] The purpose of this invention is to provide a coal-water slurry gasification raw gas anti-clogging scrubbing tower, which solves the clogging problem of existing coal-water slurry scrubbing towers during start-up and shutdown, reducing maintenance costs and safety hazards.

[0007] The technical solution adopted in this utility model is a coal-water slurry gasification crude gas anti-clogging scrubbing tower. The coal-water slurry gasification crude gas anti-clogging scrubbing tower includes a tower body with a closed cavity. A Venturi scrubber is vertically installed inside the tower body. The air inlet of the Venturi scrubber is fixed to the tower body wall and connected to the gas transmission pipeline. The tower body wall is also provided with a spray water inlet and a Venturi flushing water outlet. The spray water inlet and the Venturi flushing water outlet are connected to the Venturi scrubber through pipelines.

[0008] The Venturi scrubber has a slag separation tank at the bottom, with a black water drain outlet at the bottom. The top of the tower has an exhaust port, and several trays are arranged between the exhaust port and the Venturi scrubber.

[0009] The present invention is further characterized in that,

[0010] Several layers of trays are horizontally arranged inside the tower body. A cyclone demister is installed between the top tray and the exhaust port, and a condensate inlet is provided on the tower body wall between the cyclone demister and the tray.

[0011] The Venturi scrubber has a water jacket on the outside of its throat. The upper part of the water jacket is connected to the spray water inlet through a pipe, and the lower part of the water jacket is connected to the Venturi flush water outlet through a pipe.

[0012] The throat of the Venturi scrubber is equipped with several spray holes evenly distributed around the circumference. The Venturi scrubbing water enters the water jacket tangentially from the spray water inlet. The spray water swirls inside the water jacket and enters the throat of the scrubber through the spray holes to come into contact with the crude gas.

[0013] The centerline of the spray nozzle forms an angle of °~° with the axis of the Venturi scrubber throat.

[0014] A riser pipe is installed between the Venturi scrubber and the slag separation tank. The riser pipe is sleeved on the outside of the bottom end of the Venturi scrubber. Several air guide branches are connected to the outside of the riser pipe near the top. The air guide branches are connected to the inside of the riser pipe, and multiple exhaust holes are provided at the top of the air guide branches.

[0015] The diameter of the riser pipe is larger than the diameter of the outlet end of the Venturi scrubber, and an annular space for gas passage is formed between the inner wall of the riser pipe and the Venturi scrubber.

[0016] Several gas guide branches are distributed at equal angles along the circumference of the riser.

[0017] The slag separation tank includes a flow-gathering plate, a flow-dividing plate, and a bottom plate arranged from top to bottom. Both the flow-gathering plate and the bottom plate are funnel-shaped, and their small-diameter through holes are arranged opposite each other. The outer periphery of the small-diameter through holes on the bottom plate is provided with an inner wall, and the height of the inner wall is the height set by the bottom plate.

[0018] The flow divider includes a conical inclined plate and a vertical plate. The conical inclined plate covers the small-diameter through-hole of the flow convergence plate from above. The vertical plate is connected to the lower part of the conical inclined plate and is inserted between the inner wall and the tower wall. The vertical plate is separated from the bottom plate, the inner wall and the side wall of the tower by a set distance.

[0019] A light slag discharge port is provided at a distance H above the bottom edge of the vertical plate of the diversion plate on the side wall of the tower body; a heavy slag discharge port is provided above the bottom plate on the side wall of the tower body.

[0020] The beneficial effects of this utility model are:

[0021] (1) This utility model effectively solves the problem of easy blockage of the dual-path discharge system during start-up and shutdown in the prior art by optimizing the design of the Venturi scrubber and the graded slag discharge structure of the slag separation tank. The Venturi scrubber has a water jacket on the outside of the throat pipe. The spray water enters tangentially and forms a vortex before being sprayed out through the evenly distributed spray holes around the circumference, avoiding the blockage of traditional nozzles. The water jacket can also be cleaned online through the Venturi flushing water outlet. The flow-gathering plate of the slag separation tank guides the washing liquid to flow in a directional manner. The conical inclined plate and the vertical plate of the flow-dividing plate separate light and heavy slag. The trumpet-shaped structure of the bottom plate gathers heavy slag. The light slag discharge port and the heavy slag discharge port are used to achieve graded discharge, reducing the pipe blockage caused by impurity deposition.

[0022] (2) This utility model reduces maintenance costs and safety risks through its gas-liquid separation auxiliary structure and maintenance-free design. The riser pipe and the Venturi scrubber form an annular channel, and the gas guide branches are distributed at equal angles to achieve uniform gas discharge and reduce ash and slag back deposition; the tray slows down the gas flow rate, and the cyclone demister removes mist particles, reducing the adhesion of impurities in subsequent pipelines. These designs reduce the need for manual disassembly and unblocking, and slag cleaning and maintenance can be carried out without stopping the machine, reducing the risk of operators coming into contact with high-temperature and high-pressure components, and also reducing unplanned downtime and spare parts replacement costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the anti-clogging scrubbing tower for coal-water slurry gasification of crude coal gas;

[0024] Figure 2 This is a schematic diagram of the slag separation tank in the anti-clogging washing tower for coarse coal gasification of water-coal slurry;

[0025] Figure 3 This is a cross-sectional view of the throat of the Chinese-made Qiuli scrubber in the anti-clogging scrubbing tower for coal-water slurry gasification of crude coal gas.

[0026] Figure 4 This is a cross-sectional view of the Chinese-language Qiuli scrubber in the coal-water slurry gasification crude gas anti-clogging scrubbing tower of this utility model;

[0027] Figure 5This is a top view of the gas guide pipe in the anti-clogging scrubbing tower for coal-water slurry gasification of crude coal gas of this utility model.

[0028] In the diagram, 1. Tower body, 2. Exhaust port, 3. Cyclone demister, 4. Condensate inlet, 5. Tray, 6. Venturi scrubber, 7. Air inlet, 8. Spray water inlet, 9. Water jacket, 10. Venturi flushing water outlet, 11. Riser pipe, 12. Spray hole, 13. Gas guide branch pipe, 14. Exhaust port, 15. Slag separation tank, 16. Bottom plate, 17. Inner wall, 18. Concentrating plate, 19. Diverting plate, 20. Light slag, 21. Light slag discharge port, 22. Heavy slag, 23. Heavy slag discharge port, 24. Black water drain, 25. Spray hole. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] This utility model relates to an anti-clogging scrubbing tower for coal-water slurry gasification of crude coal gas, such as... Figure 1 As shown, the tower body 1 is a main structure with a closed cavity, providing an independent space for the washing and purification of crude coal gas, preventing impurities from leaking out and interference from the external environment. A Venturi scrubber 6 is vertically installed inside the tower body 1, with its inlet 7 fixed to the tower wall and connected to the gas pipeline. Crude coal gas can enter the Venturi scrubber 6 through the inlet 7 via the gas pipeline. This connection method ensures that the crude coal gas can stably enter the washing stage, laying the foundation for subsequent purification.

[0032] The tower wall is also equipped with a spray water inlet 8 and a Venturi flushing water outlet 10, both of which are connected to the Venturi scrubber 6 via pipelines. The spray water inlet 8 is used to introduce washing water into the Venturi scrubber 6. The washing water is fully mixed with the high-speed flowing crude gas in the Venturi scrubber 6. Utilizing the turbulence effect of the Venturi structure, the solid particles such as ash and dust entrained in the gas are wetted and agglomerated, thus initially achieving solid-gas separation. The Venturi flushing water outlet 10 can promptly discharge the flushing wastewater in the Venturi scrubber 6, avoiding the retention and deposition of slag-containing wastewater generated during the flushing process inside the scrubber, and reducing the risk of blockage of the Venturi scrubber 6 itself.

[0033] A slag separation tank 15 is installed below the Venturi scrubber 6. The gas-liquid mixture after preliminary treatment by the Venturi scrubber 6 flows downward into the slag separation tank 15. Larger particles of ash that are wetted and agglomerated will settle to the bottom of the slag separation tank 15 under gravity, achieving further solid-liquid separation. A black water drain outlet 24 is provided at the bottom of the slag separation tank 15, allowing only black water to be discharged.

[0034] An exhaust port 2 is provided at the top of the tower body 1 to discharge the purified clean coal gas. Several trays 5 are arranged between the exhaust port 2 and the Venturi scrubber 6. The coal gas, after being treated by the Venturi scrubber 6 and the slag separation tank 15, flows upward and, as it passes through the trays 5, comes into contact with the scrubbing liquid on the trays again, further removing the remaining fine particulate impurities and improving the coal gas purification effect. At the same time, the barrier effect of the trays 5 can slow down the coal gas flow rate, allowing the fine particles that have not settled completely to have more time to settle to the slag separation tank 15 below, reducing the impurity content that enters the exhaust port 2 with the coal gas, and indirectly reducing the risk of blockage in subsequent pipelines.

[0035] Through the above structural design, the efficient mixing and washing of the Venturi scrubber 6, the directional slag discharge of the slag separation tank 15, the secondary purification and sedimentation assistance of the tray 5, and the timely sewage discharge of the Venturi flushing water outlet 10, together achieve the rapid separation and discharge of impurities during the crude gas washing process, effectively preventing blockage at the bottom of the tower and related pipelines.

[0036] Example 2

[0037] This utility model relates to an anti-clogging scrubbing tower for coal-water slurry gasification of crude coal gas, such as... Figure 1 As shown, the tower body 1 includes a closed cavity. A Venturi scrubber 6 is vertically installed inside the tower body 1. The air inlet 7 of the Venturi scrubber 6 is fixed to the tower body wall and connected to the air supply pipeline. The tower body wall is also provided with a spray water inlet 8 and a Venturi flushing water outlet 10. The spray water inlet 8 and the Venturi flushing water outlet 10 are connected to the Venturi scrubber 6 through pipelines.

[0038] Below the Venturi scrubber 6 is a slag separation tank 15, and at the bottom of the slag separation tank 15 is a black water drain outlet 24. At the top of the tower body 1 is an exhaust outlet 2, and several layers of tower trays 5 are arranged between the exhaust outlet and the Venturi scrubber 6.

[0039] Furthermore, several layers of trays 5 are horizontally arranged inside the tower body 1. This horizontal layout allows the trays 5 to evenly divide the internal space of the tower, forming multiple purification zones. When the gas flows upward, it needs to pass through the trays 5 layer by layer, making full contact with the washing liquid on the trays. This not only further adsorbs the fine particles remaining in the gas, but also slows down the gas flow rate with the obstruction effect of the trays, allowing unsettled impurities more time to fall to the slag separation tank 15 below, reducing the amount of impurities migrating upward with the gas and reducing the risk of blockage from the source. A cyclone demister 3 is installed between the top tray 5 and the exhaust port 2. After the gas has been purified through multiple layers of trays, it may still carry a small amount of mist (containing fine particles). The cyclone demister 3 uses the centrifugal force generated by the rotating airflow to throw the mist towards the tower wall, where it gathers and drips down, preventing particles in the mist from entering the exhaust port 2 and subsequent pipelines with the gas, further improving the cleanliness of the gas. Furthermore, a condensate inlet 4 is provided on the tower wall between the cyclone demister 3 and the tower tray 5. The condensate can enter the tower through this inlet and come into countercurrent contact with the rising gas. This not only replenishes the washing liquid and enhances the purification effect of the tower tray, but also reduces the gas temperature through condensation, causing some impurities to condense and settle, reducing their adhesion to the cyclone demister 3, and indirectly reducing the possibility of blockage.

[0040] Furthermore, a riser pipe 11 is installed between the Venturi scrubber 6 and the slag separation tank 15. The riser pipe 11 is fitted around the bottom of the Venturi scrubber 6, forming an annular channel. When the gas-liquid mixture treated by the Venturi scrubber 6 flows downward, the liquid (containing a large amount of ash) can fall directly into the slag separation tank 15, while the gas can enter the annular space between the riser pipe 11 and the Venturi scrubber 6, avoiding excessive mixing of gas and liquid that would cause the ash to return upward with the gas. Several gas guide pipes 13 are connected to the outside of the riser pipe 11 near the upper end. The gas guide pipes 13 are connected to the inside of the riser pipe 11, and multiple exhaust holes 14 are provided at the top of the gas guide pipes 13. When the gas accumulates to a certain extent in the riser pipe 11, it can be smoothly discharged through the exhaust holes 14 at the top of the gas guide pipes 13 and enter the tray 5 area in the upper part of the tower body 1 for secondary purification. This structural design achieves preliminary gas-liquid separation, reduces ash deposition in the riser pipe 11, and avoids ash being blown up by gas impact through the dispersed exhaust of the gas guide branch pipe 13, thereby reducing the risk of blockage in the riser pipe 11 and surrounding pipelines and ensuring smooth gas-liquid flow.

[0041] Example 3

[0042] Based on Embodiment 2 above, in this embodiment, the diameter of the riser pipe 11 is larger than the diameter of the outlet end of the Venturi scrubber 6. This size design naturally forms an annular space between the inner wall of the riser pipe 11 and the outer wall of the Venturi scrubber 6. This annular space provides a dedicated channel for gas flow—in the gas-liquid mixture processed by the Venturi scrubber 6, the liquid (containing a large amount of ash) falls downward into the slag separation tank 15 below due to gravity, while the gas can flow upward along the annular space. This avoids excessive mixing of gas and liquid, which would cause ash to return with the gas, and reduces the adhesion and deposition of ash on the inner wall of the riser pipe 11, structurally reducing the possibility of pipeline blockage.

[0043] like Figure 5 As shown, several gas guide branches 13 are distributed at equal angles along the circumference of the riser pipe 11. This arrangement allows the gas inside the riser pipe 11 to be evenly discharged through the gas guide branches 13. When the gas rises to the position of the gas guide branch 13 in the annular space, it can be simultaneously diverted outward through each branch, avoiding excessive local airflow velocity due to concentrated exhaust and preventing the airflow from impacting and stirring up the settled ash again. At the same time, the equal angle distribution ensures the stability of the airflow field inside the tower, reduces the accumulation of ash in local areas caused by airflow turbulence, further helps to reduce the risk of blockage, and ensures smooth gas delivery to the upper tray area of ​​the tower.

[0044] Example 4

[0045] Based on Embodiment 3 above, this embodiment of the present invention, as follows: Figure 2 As shown, the slag separation tank 15 achieves efficient separation of impurities in the washing liquid through the coordinated design of the flow-gathering plate 18, the flow-diverting plate 19, and the bottom plate 16. Its structure and function are adapted to the graded treatment requirements of light and heavy impurities in the coke oven gas washing process, as detailed below:

[0046] The slag separation tank 15 is arranged from top to bottom as follows: a flow-collecting plate 18, a flow-distributing plate 19, and a bottom plate 16. Both the flow-collecting plate 18 and the bottom plate 16 are funnel-shaped, and their small-diameter through holes are arranged opposite each other. The funnel-shaped structure of the flow-collecting plate 18 can gather the washing liquid (including adsorbed impurities) flowing down from above to the center, and guide it directionally to the flow-distributing plate 19 below through its small-diameter through holes, avoiding the washing liquid from spreading randomly in the tank and causing uneven distribution of impurities. The funnel-shaped structure of the bottom plate 16 forms a reverse convergence from the bottom, and its small-diameter through holes correspond to the through holes of the flow-collecting plate 18, providing a channel for the subsequent flow of the washing liquid. At the same time, with the help of the funnel-shaped inclined plate surface, the deposited heavy impurities are guided to gather in a specific area, which is convenient for centralized cleaning.

[0047] An inner wall 17 is provided around the periphery of the small-diameter through hole above the bottom plate 16. The inner wall 17 is higher than the bottom plate 16 by a set height, and together with the bottom plate 16 and the side wall of the tower body 1, it encloses a separation space. This structure allows the washing liquid in the slag separation tank 15 to maintain a certain liquid level. Through the difference in liquid level, a communication-like effect is formed, which not only ensures the stable overflow circulation of the washing liquid, but also uses the liquid level to block gas disturbance, preventing impurities from being lifted by the airflow, and providing a stable environment for impurity sedimentation and separation.

[0048] The diversion plate 19, as the core separation component, consists of a conical inclined plate and a vertical plate. The conical inclined plate covers the small-diameter through-holes of the flow-collecting plate 18 from above, collecting the washing liquid flowing down from the flow-collecting plate 18. The inclined plate guides the liquid to diffuse towards the edge, allowing the liquid to flow evenly into the outer area of ​​the slag separation tank 15. The vertical plate connects to the lower part of the conical inclined plate, inserting vertically downwards between the inner wall 17 and the side wall of the tower body 1, maintaining a set distance from the bottom plate 16, the inner wall 17, and the side wall of the tower body 1. The spacing design creates a triple separation channel: the space between the outer side of the vertical plate and the side wall of the tower body 1 allows light impurities (such as coal ash) to float and accumulate as the washing liquid flows, forming light slag 20; the space between the inner side of the vertical plate and the inner wall 17 allows the clean washing liquid that has undergone preliminary separation to pass through, and finally overflows from the top of the inner wall 17 to the subsequent circulation system; the gap between the bottom plate 16 and the bottom of the vertical plate allows heavy impurities (such as coal slag) to settle to the surface of the bottom plate 16 under the action of gravity, forming heavy slag 22.

[0049] Through the above structure, the washing liquid completes the entire process of "convergence-guidance-grading sedimentation" in the slag separation tank 15: light slag is trapped on the outside of the vertical plate, heavy slag is deposited on the bottom plate 16, and the clean washing liquid is recycled and reused through the overflow of the inner wall 17. This not only realizes the real-time renewal of the washing liquid and reduces the clogging of subsequent spray components by impurities, but also reduces the difficulty of slag cleaning through grading and separation. It is highly compatible with the requirement of "separate treatment of light and heavy impurities" in coke oven gas washing, and effectively improves the stability and efficiency of the washing system.

[0050] Example 5

[0051] Based on Embodiment 4 above, in this embodiment, a light slag discharge port 21 is provided at a distance H above the bottom edge of the vertical plate of the diversion plate 19 on the side wall of the tower body 1; a heavy slag discharge port 23 is provided above the bottom plate 16 on the side wall of the tower body 1.

[0052] On the side wall of tower body 1, the light slag discharge port 21 is located at a distance H above the bottom edge of the vertical plate relative to the diversion plate 19. Because the light slag 20 (such as coal ash) has a low density, it is difficult for it to sink to the bottom when flowing with the washing liquid outside the vertical plate. It will gradually accumulate at a certain height above the bottom edge of the vertical plate. When the light slag 20 accumulates to a certain amount, the valve of the light slag discharge port 21 can be opened to quickly discharge the light slag 20 outside the vertical plate. This prevents excessive accumulation of light slag 20 from blocking the channel between the vertical plate and the tower side wall, ensuring smooth flow of the washing liquid outside the vertical plate. Simultaneously, the slag removal operation can be completed without stopping the machine, reducing the impact on the continuous operation of the washing system.

[0053] On the side wall of tower body 1, the heavy slag discharge port 23 is positioned above the bottom plate 16, adapted to the deposition area of ​​heavy slag 22 on the surface of the bottom plate 16. Heavy slag 22 (such as coal ash) has a high density and will preferentially settle to the surface of the bottom plate 16 under gravity. Especially under the guidance of the funnel-shaped structure of the bottom plate 16, the heavy slag 22 will accumulate at the angle between the bottom plate 16 surface and the tower wall. The position of the heavy slag discharge port 23 is precisely aligned with these accumulated heavy slag 22, facilitating the direct discharge of the heavy slag 22 deposited on the bottom plate 16. When the heavy slag 22 accumulates to the point that it affects the flow of washing liquid from the bottom plate or may block the channel, opening the valve of the heavy slag discharge port 23 can efficiently remove the bottom heavy slag 22, preventing pipe blockage caused by the caking of the heavy slag 22. Simultaneously, in conjunction with the inclined structure of the bottom plate 16, gravity can be used to assist in the discharge of the heavy slag 22, improving the slag removal efficiency.

[0054] Example 6

[0055] This embodiment is based on embodiment 5 above, such as Figure 3 and Figure 4 As shown in the figure, in this utility model, a water jacket 9 is arranged around the outside of the throat of the Venturi scrubber 6, forming an annular sealed space. This structure provides a flow channel for the spray water and also provides a certain cooling and protection for the throat. The upper part of the water jacket 9 is connected to the spray water inlet 8 through a dedicated pipeline, and the lower part is connected to the Venturi flushing water outlet 10 through a pipeline, forming a complete "water inlet-flow-drainage" loop. During normal washing, the spray water enters the water jacket 9 through the upper pipeline; when it is necessary to clean the scale inside the water jacket, the flushing water can be discharged through the lower pipeline, realizing the online flushing function and solving the problem of scale blockage during long-term operation without disassembling the equipment.

[0056] On the throat of the Venturi scrubber 6, several spray holes 12 are evenly distributed along the circumference. The diameter of these spray holes is usually designed to be 5-10 mm, and the angle between the center line of the spray hole and the axis of the throat is 30°~60°. This angle design ensures that the spray water enters the throat and forms an oblique impact with the crude gas, enhancing the contact efficiency. During operation, the Venturi scrubbing water flows tangentially from the spray water inlet 8 into the water jacket 9. This tangential entry causes the water flow to naturally form a vortex within the annular space of the water jacket, which not only makes the water flow more evenly distributed within the jacket, but also reduces the deposition of impurities on the inner wall of the jacket by utilizing the centrifugal force of the vortex. The swirling spray water is then evenly sprayed into the throat of the Venturi scrubber through the circumferentially distributed spray holes 12, making full contact with the crude coal gas flowing through the throat. The fine droplets formed by the spray water can quickly wet the solid particles such as coal ash and dust entrained in the crude coal gas, causing them to agglomerate and increase in weight, laying the foundation for subsequent sedimentation and separation in the scrubbing tower.

[0057] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coal-water slurry gasification crude gas anti-clogging scrubbing tower, characterized in that, The tower body (1) includes a closed cavity. A Venturi scrubber (6) is vertically installed inside the tower body (1). The air inlet (7) of the Venturi scrubber (6) is fixed to the tower body wall and connected to the gas pipeline. The tower body wall is also provided with a spray water inlet (8) and a Venturi flushing water outlet (10). The spray water inlet (8) and the Venturi flushing water outlet (10) are connected to the Venturi scrubber (6) through pipelines. Below the Venturi scrubber (6) is a slag separation tank (15), the bottom of the slag separation tank (15) is a black water drain outlet (24), the top of the tower body (1) is an exhaust outlet (2), and several layers of tower trays (5) are arranged between the exhaust outlet and the Venturi scrubber (6).

2. The anti-clogging scrubbing tower for raw coal gasification of water-coal slurry according to claim 1, characterized in that, Several layers of trays (5) are horizontally arranged inside the tower body (1). A cyclone demister (3) is provided between the top tray (5) and the exhaust port (2), and a condensate inlet (4) is provided on the tower wall between the cyclone demister (3) and the tray (5).

3. The anti-clogging scrubbing tower for coal-water slurry gasification of crude coal gas according to claim 1, characterized in that, The Venturi scrubber (6) has a water jacket (9) on the outside of its throat. The upper part of the water jacket (9) is connected to the spray water inlet (8) through a pipe, and the lower part of the water jacket (9) is connected to the Venturi flushing water outlet (10) through a pipe. The throat of the Venturi scrubber (6) is provided with several spray holes (12) evenly distributed around the circumference. The Venturi scrubbing water enters the water jacket (9) tangentially from the spray water inlet (8). The spray water swirls inside the water jacket (9) and enters the scrubber throat from the spray holes (12) to contact the crude gas.

4. The anti-clogging scrubbing tower for crude coal gasification of water-coal slurry according to claim 3, characterized in that, The centerline of the spray hole (12) forms an angle of 30°~60° with the axis of the Venturi scrubber throat.

5. The anti-clogging scrubbing tower for coal-water slurry gasification of crude coal gas according to claim 1, characterized in that, A riser pipe (11) is provided between the Venturi scrubber (6) and the slag separation tank (15). The riser pipe (11) is sleeved on the outside of the bottom end of the Venturi scrubber (6). Several air guide branches (13) are connected to the outside of the riser pipe (11) near the upper end. The air guide branches (13) are connected to the inside of the riser pipe (11), and multiple exhaust holes (14) are provided at the top of the air guide branches (13).

6. The anti-clogging scrubbing tower for coal-water slurry gasification of crude coal gas according to claim 5, characterized in that, The diameter of the riser pipe (11) is larger than the diameter of the outlet end of the Venturi scrubber (6), and an annular space for gas passage is formed between the inner wall of the riser pipe (11) and the Venturi scrubber (6). Several gas guide branches (13) are distributed at equal angles along the circumference of the riser (11).

7. The anti-clogging scrubbing tower for crude coal gasification of water-coal slurry according to claim 1, characterized in that, The slag separation tank (15) includes a flow-gathering plate (18), a flow-dividing plate (19), and a bottom plate (16) arranged from top to bottom. Both the flow-gathering plate (18) and the bottom plate (16) are funnel-shaped, and their small-diameter through holes are arranged opposite to each other. An inner wall (17) is provided around the periphery of the small-diameter through hole above the bottom plate (16), and the height of the inner wall (17) is the height set by the bottom plate (16). The diverter plate (19) includes a conical inclined plate and a vertical plate. The conical inclined plate covers the small-diameter through hole of the flow-gathering plate (18) from above. The vertical plate is connected to the lower part of the conical inclined plate. The vertical plate is inserted between the inner wall (17) and the tower wall. The vertical plate is separated from the bottom plate (16), the inner wall (17) and the side wall of the tower (1) by a set distance.

8. The anti-clogging scrubbing tower for raw coal gasification of water-coal slurry according to claim 7, characterized in that, A light slag discharge port (21) is provided at a distance H above the bottom edge of the vertical plate of the diversion plate (19) on the side wall of the tower body (1); a heavy slag discharge port (23) is provided above the bottom plate (16) on the side wall of the tower body (1).

Images