Venturi scrubber built into a coal gasification scrubber tower

Abstract

Venturi scrubber built in gas washing tower of coal gasification, including convergent pipe, convergent pipe is two ends open taper, convergent pipe's taper diffusion end is gas inlet, convervent pipe's taper contraction end is fixedly connected with throat pipe and diffusion pipe in proper order, diffusion pipe is two ends open taper, diffusion pipe's taper contraction end is fixedly connected with one end of throat pipe, diffusion pipe's taper diffusion end is gas outlet, throat pipe is equal diameter pipe, throat pipe side wall is open and has nozzle, throat pipe outer wall is equipped with barrel, barrel is open and has pipe orifice, the inner wall of barrel and the outer wall of convergent pipe, throat pipe, diffusion pipe all have gap. The utility model can make waste gas form good speed distribution and negative pressure environment in flowing process, improve gas-liquid mixing efficiency, the taper of convergent pipe, throat pipe length and diffusion angle design are optimized, make airflow speed distribution uniform, atomized liquid drop particle size reduce to 5-10 μm, contact area with dust increase 30%, purification efficiency reach 98% or more, so as to improve the purification effect of pollutant significantly.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas purification and dust removal equipment, and relates to a Venturi scrubber built into a coal gasification scrubbing tower. Background Technology

[0002] In industrial production processes, industries such as chemical, metallurgical, and power generation produce large amounts of waste gas or process gas containing pollutants such as dust and harmful gases. Venturi scrubbers, a commonly used dust-laden gas purification device, work by using the negative pressure generated when a high-speed airflow passes through a Venturi tube to draw in liquid and atomize it. This allows the atomized droplets to fully contact the waste gas or process gas, thereby achieving the capture and purification of pollutants. However, existing Venturi scrubbers have unreasonable structural designs, resulting in low gas-liquid mixing efficiency and unsatisfactory purification effects. Utility Model Content

[0003] The purpose of this invention is to provide a Venturi scrubber built into a coal gasification scrubbing tower, which solves the problems of low gas-liquid mixing efficiency and high energy consumption in the prior art.

[0004] The technical solution adopted in this utility model is a Venturi scrubber built into a coal gasification scrubbing tower, including a contraction tube, which is a cone shape with open ends. The conical diffuser end of the contraction tube is the air inlet. The conical contraction end of the contraction tube is fixedly connected to a throat tube and a diffuser tube in sequence. The diffuser tube is a cone shape with open ends. The conical contraction end of the diffuser tube is fixedly connected to one end of the throat tube. The conical diffuser end of the diffuser tube is the air outlet. The throat tube is a tube of equal diameter. A nozzle is opened on the side wall of the throat tube. A cylinder is sleeved on the outer wall of the throat tube. A pipe opening is opened on the cylinder. There are gaps between the inner wall of the cylinder and the outer walls of the contraction tube, the throat tube, and the diffuser tube.

[0005] The features of this utility model also include: The cylinder includes a connecting cylinder, with an upper cover and a lower cover fixedly connected to both ends of the connecting cylinder. The upper cover is a circular end cap with a through hole on its surface, and the inner wall of the through hole is fixedly connected to the outer wall of the shrink tube. The lower cover is a circular end cap with a through hole on its surface, and the inner wall of the through hole is fixedly connected to the outer wall of the diffuser tube.

[0006] An opening is made on the side wall of the connecting cylinder, and the opening is 200-330mm away from the connection between the connecting cylinder and the lower cover.

[0007] The nozzle opens obliquely towards the outer wall of the throat along the direction of air output, and the angle between the oblique axis of the nozzle and the axis of the throat is 30°-45°.

[0008] There are 4-12 nozzles.

[0009] The inner diameter of the conical diffuser end of the shrink tube is φ488mm-588mm, the inner diameter of the conical shrink end is φ250mm-350mm, the length is 510mm-610mm, and the inner wall taper is 25°-35°.

[0010] The inner diameter of the throat is φ250mm-350mm, the length is 550mm-650mm, and the inner wall roughness is Ra1.6μm-1.8μm.

[0011] The inner diameter of the conical contraction end of the diffuser is φ250mm-350mm, the inner diameter of the conical diffusion end is φ488mm-588mm, the length is 1600mm-1800mm, and the diffusion angle is 7°-10°.

[0012] There are two orifices 5, and they are centrally symmetrical along the axis of throat 2.

[0013] The beneficial effects of this utility model are: (1) The Venturi scrubber built into the gasification scrubbing tower of this utility model adopts an optimized Venturi tube section structure, including a contraction section, throat and diffusion section of specific size, which can make the waste gas form a good velocity distribution and negative pressure environment during the flow process, improve the gas-liquid mixing efficiency. The optimized design of the contraction tube taper, throat length and diffusion angle makes the airflow velocity distribution uniform, the atomized droplet particle size small (5μm-10μm), the contact area with dust increased by 30%, and the purification efficiency reaches more than 98%, thereby significantly improving the purification effect of pollutants.

[0014] (2) The Venturi scrubber built into the gasification scrubbing tower of this utility model has a structural design and size parameters that make the scrubber consume less energy during operation, reducing the operating cost of enterprises. The built-in design reduces pipeline resistance, reduces fan power by 15%, and the amount of scrubbing liquid can be adjusted, reducing operating costs by 20%.

[0015] (3) The Venturi scrubber of this utility model, which is built into the gasification scrubbing tower, allows for flexible adjustment of the scrubbing liquid injection device according to actual working conditions, thereby improving the adaptability and economic efficiency of the equipment. At the same time, the built-in Venturi scrubber adopts an atmospheric pressure design, which reduces the investment cost of enterprises. The atmospheric pressure design does not require pressure vessel qualification, and the built-in scrubbing tower saves floor space, reducing equipment investment by 30%. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the Venturi scrubber built into a coal gasification scrubbing tower according to this utility model. Figure 2 This is a cross-sectional schematic diagram of the throat and cylinder of this utility model. Detailed Implementation

[0017] The following detailed description is provided in conjunction with specific implementation methods.

[0018] like Figure 1 As shown, the Venturi scrubber built into the coal gasification scrubbing tower includes a contraction tube 1, which is a cone shape with open ends. The conical diffuser end of the contraction tube 1 is the air inlet. The inner diameter of the conical diffuser end is φ488mm-588mm, the inner diameter of the conical contraction end is φ250mm-350mm, the length is 510mm-610mm, and the inner wall taper is 25°-35° to ensure uniform airflow acceleration.

[0019] The conical contraction end of the contraction tube 1 is sequentially welded with the throat tube 2 and the diffuser tube 3. The throat tube 2 is a tube of equal diameter, with an inner diameter of φ250mm-350mm, a length of 550mm-650mm, and an inner wall roughness of Ra1.6μm-1.8μm.

[0020] The diffuser 3 is a cone shape with open ends and downward diffusion. The concave end of the diffuser 3 is welded to the throat 2 and has an inner diameter of φ250mm-350mm. The concave diffuser end is the air outlet with an inner diameter of φ488mm-588mm and a length of 1600mm-1800mm. The diffusion angle is 7°-10°, thereby reducing airflow resistance.

[0021] A cylindrical body 4 is fitted over the throat tube 2. The cylindrical body 4 includes a connecting cylindrical body 403, with an upper cap 401 and a lower cap 402 fixedly connected to its two ends, respectively. The upper cap 401 is a circular end cap with a through hole on its surface, and the inner wall of the through hole is welded to the outer wall of the contraction tube 1. The lower cap 402 is a circular end cap with a through hole on its surface, and the inner wall of the through hole is welded to the outer wall of the diffuser tube 3. There are gaps between the inner wall of the cylindrical body 4 and the outer walls of the contraction tube 1, the throat tube 2, and the diffuser tube 3.

[0022] Two pipe openings 5 ​​are respectively opened on the side wall of the connecting cylinder 403. The pipe openings 5 ​​conform to the GB / T14976 standard, with an inner diameter of φ80mm-100mm. The distance between the axis of the pipe openings 5 ​​and the connection between the connecting cylinder 403 and the lower cover 402 is 200mm-330mm.

[0023] Nozzle 6 opens obliquely to the outer wall of throat 2 along the air outlet direction, and the angle between the oblique axis of the nozzle and the axis of throat 2 is 30°-45°. There are a total of 4 nozzles 6, which are evenly distributed along the side wall of throat 2. The 4 nozzles 6 are located in the same cross section, that is, adjacent nozzles 6 are spaced 90° apart.

[0024] There can be 4-12 nozzles.

[0025] like Figure 2 As shown, a cylindrical body 4 is fitted over the throat tube 2, and the cylindrical body 4 is concentric with the throat tube 2. Two openings 5 ​​are respectively opened on the connecting cylindrical body 403, and are centrally symmetrical along the axis of the throat tube 2.

[0026] During operation, the polluted gas enters through the inlet of the contraction tube 1. As the diameter of the contraction tube decreases, the flow velocity gradually increases. Washing liquid or water is introduced into the cylinder 4 through the inlet 5 and injected into the airflow in the contraction tube 1 in the opposite direction of the outlet through nozzles 6 evenly spaced on the side wall of the throat tube 2, allowing for large-area contact between the liquid and gas. At this point, the high-speed airflow tears the liquid into numerous tiny droplets (5μm-10μm), achieving liquid atomization. Simultaneously, the contact area with dust increases by 30%, resulting in a purification efficiency of over 98%.

[0027] The input flow rate at pipe 5 can be adjusted via a valve.

[0028] The airflow then reaches its maximum velocity within throat 2. This high-speed airflow causes the droplets to collide violently with particulate matter or harmful gas molecules in the gas. Due to inertia, the particulate matter deviates from the airflow direction, collides with the droplets, and is captured. When the size of the particulate matter is close to the diameter of the droplet, it will be directly intercepted by the droplet. Tiny particulate matter diffuses to the surface of the droplet due to Brownian motion and is adsorbed. If the gas contains harmful soluble components, such as SO2, HCl, or H2S, they will react chemically or physically with the absorbent in the droplet.

[0029] Finally, the airflow flows into diffuser 3, where the velocity gradually decreases and the static pressure rises, converting some kinetic energy into pressure energy and reducing system resistance loss. Droplets carrying captured particulate matter or absorbed products condense into larger droplets within diffuser 3, which are then discharged through the outlet and enter subsequent separation equipment. Under centrifugal force or gravity, they separate from the gas, ultimately forming purified gas and waste liquid containing pollutants.

[0030] Example 1 The Venturi scrubber built into the coal gasification scrubbing tower includes a contraction tube 1, which is a cone shape with open ends. The conical diffuser end of the contraction tube 1 is the air inlet. The conical contraction end of the contraction tube 1 is fixedly connected to the throat tube 2 and the diffuser tube 3 in sequence. The diffuser tube 3 is a cone shape with open ends. The conical contraction end of the diffuser tube 3 is fixedly connected to one end of the throat tube 2. The conical diffuser end of the diffuser tube 3 is the air outlet. The throat tube 2 is a tube of equal diameter. A nozzle 6 is opened on the side wall of the throat tube 2. A cylinder 4 is sleeved on the outer wall of the throat tube 2. A pipe opening 5 is opened on the cylinder 4. There are gaps between the inner wall of the cylinder 4 and the outer walls of the contraction tube 1, the throat tube 2, and the diffuser tube 3.

[0031] Example 2 The Venturi scrubber built into the coal gasification scrubbing tower includes a contraction tube 1, which is a cone shape with open ends. The conical diffuser end of the contraction tube 1 is the air inlet. The conical contraction end of the contraction tube 1 is fixedly connected to the throat tube 2 and the diffuser tube 3 in sequence. The diffuser tube 3 is a cone shape with open ends. The conical contraction end of the diffuser tube 3 is fixedly connected to one end of the throat tube 2. The conical diffuser end of the diffuser tube 3 is the air outlet. The throat tube 2 is a tube of equal diameter. A nozzle 6 is opened on the side wall of the throat tube 2. A cylinder 4 is sleeved on the outer wall of the throat tube 2. A pipe opening 5 is opened on the cylinder 4. There are gaps between the inner wall of the cylinder 4 and the outer walls of the contraction tube 1, the throat tube 2, and the diffuser tube 3.

[0032] The cylinder 4 includes a connecting cylinder 403, with an upper cap 401 and a lower cap 402 fixedly connected to both ends of the connecting cylinder 403. The upper cap 401 is a circular cap with a through hole on its surface, and the inner wall of the through hole is fixedly connected to the outer wall of the shrink tube 1. The lower cap 402 is a circular cap with a through hole on its surface, and the inner wall of the through hole is fixedly connected to the outer wall of the diffuser tube 3.

[0033] A pipe opening 5 is opened on the side wall of the connecting cylinder 403. The inner diameter of the pipe opening 5 is φ80mm-100mm. The distance between the center of the pipe opening 5 and the connection between the connecting cylinder 403 and the lower cover 402 is 200mm-330mm.

[0034] Example 3 The Venturi scrubber built into the coal gasification scrubbing tower includes a contraction tube 1, which is a cone shape with open ends. The conical diffuser end of the contraction tube 1 is the air inlet. The conical contraction end of the contraction tube 1 is fixedly connected to the throat tube 2 and the diffuser tube 3 in sequence. The diffuser tube 3 is a cone shape with open ends. The conical contraction end of the diffuser tube 3 is fixedly connected to one end of the throat tube 2. The conical diffuser end of the diffuser tube 3 is the air outlet. The throat tube 2 is a tube of equal diameter. A nozzle 6 is opened on the side wall of the throat tube 2. A cylinder 4 is sleeved on the outer wall of the throat tube 2. A pipe opening 5 is opened on the cylinder 4. There are gaps between the inner wall of the cylinder 4 and the outer walls of the contraction tube 1, the throat tube 2, and the diffuser tube 3.

[0035] The nozzle 6 opens obliquely to the outer wall of the throat 2 along the air outlet direction, and the angle between the oblique axis of the nozzle and the axis of the throat 2 is 30°-45°.

[0036] Example 4 The Venturi scrubber built into the coal gasification scrubbing tower includes a contraction tube 1, which is a cone shape with open ends. The conical diffuser end of the contraction tube 1 is the air inlet. The conical contraction end of the contraction tube 1 is fixedly connected to the throat tube 2 and the diffuser tube 3 in sequence. The diffuser tube 3 is a cone shape with open ends. The conical contraction end of the diffuser tube 3 is fixedly connected to one end of the throat tube 2. The conical diffuser end of the diffuser tube 3 is the air outlet. The throat tube 2 is a tube of equal diameter. A nozzle 6 is opened on the side wall of the throat tube 2. A cylinder 4 is sleeved on the outer wall of the throat tube 2. A pipe opening 5 is opened on the cylinder 4. There are gaps between the inner wall of the cylinder 4 and the outer walls of the contraction tube 1, the throat tube 2, and the diffuser tube 3.

[0037] There are 4-12 nozzles.

[0038] Example 5 The Venturi scrubber built into the coal gasification scrubbing tower includes a contraction tube 1, which is a cone shape with open ends. The conical diffuser end of the contraction tube 1 is the air inlet. The conical contraction end of the contraction tube 1 is fixedly connected to the throat tube 2 and the diffuser tube 3 in sequence. The diffuser tube 3 is a cone shape with open ends. The conical contraction end of the diffuser tube 3 is fixedly connected to one end of the throat tube 2. The conical diffuser end of the diffuser tube 3 is the air outlet. The throat tube 2 is a tube of equal diameter. A nozzle 6 is opened on the side wall of the throat tube 2. A cylinder 4 is sleeved on the outer wall of the throat tube 2. A pipe opening 5 is opened on the cylinder 4. There are gaps between the inner wall of the cylinder 4 and the outer walls of the contraction tube 1, the throat tube 2, and the diffuser tube 3.

[0039] The inner diameter of the conical diffuser end of the constriction tube 1 is φ488mm-588mm, the inner diameter of the conical contraction end is φ250mm-350mm, the length is 510mm-610mm, and the inner wall taper is 25°-35°.

[0040] Example 6 The Venturi scrubber built into the coal gasification scrubbing tower includes a contraction tube 1, which is a cone shape with open ends. The conical diffuser end of the contraction tube 1 is the air inlet. The conical contraction end of the contraction tube 1 is fixedly connected to the throat tube 2 and the diffuser tube 3 in sequence. The diffuser tube 3 is a cone shape with open ends. The conical contraction end of the diffuser tube 3 is fixedly connected to one end of the throat tube 2. The conical diffuser end of the diffuser tube 3 is the air outlet. The throat tube 2 is a tube of equal diameter. A nozzle 6 is opened on the side wall of the throat tube 2. A cylinder 4 is sleeved on the outer wall of the throat tube 2. A pipe opening 5 is opened on the cylinder 4. There are gaps between the inner wall of the cylinder 4 and the outer walls of the contraction tube 1, the throat tube 2, and the diffuser tube 3.

[0041] The inner diameter of the throat tube 2 is φ250mm-350mm, the length is 550mm-650mm, and the inner wall roughness is Ra1.6μm-1.8μm.

[0042] Example 7 The Venturi scrubber built into the coal gasification scrubbing tower includes a contraction tube 1, which is a cone shape with open ends. The conical diffuser end of the contraction tube 1 is the air inlet. The conical contraction end of the contraction tube 1 is fixedly connected to the throat tube 2 and the diffuser tube 3 in sequence. The diffuser tube 3 is a cone shape with open ends. The conical contraction end of the diffuser tube 3 is fixedly connected to one end of the throat tube 2. The conical diffuser end of the diffuser tube 3 is the air outlet. The throat tube 2 is a tube of equal diameter. A nozzle 6 is opened on the side wall of the throat tube 2. A cylinder 4 is sleeved on the outer wall of the throat tube 2. A pipe opening 5 is opened on the cylinder 4. There are gaps between the inner wall of the cylinder 4 and the outer walls of the contraction tube 1, the throat tube 2, and the diffuser tube 3.

[0043] The inner diameter of the conical contraction end of the diffuser tube 3 is φ250mm-350mm, the inner diameter of the conical diffusion end is φ488mm-588mm, the length is 1600mm-1800mm, and the diffusion angle is 7°-10°.

[0044] Example 8 The Venturi scrubber built into the coal gasification scrubbing tower includes a contraction tube 1, which is a cone shape with open ends. The conical diffuser end of the contraction tube 1 is the air inlet. The conical contraction end of the contraction tube 1 is fixedly connected to the throat tube 2 and the diffuser tube 3 in sequence. The diffuser tube 3 is a cone shape with open ends. The conical contraction end of the diffuser tube 3 is fixedly connected to one end of the throat tube 2. The conical diffuser end of the diffuser tube 3 is the air outlet. The throat tube 2 is a tube of equal diameter. A nozzle 6 is opened on the side wall of the throat tube 2. A cylinder 4 is sleeved on the outer wall of the throat tube 2. A pipe opening 5 is opened on the cylinder 4. There are gaps between the inner wall of the cylinder 4 and the outer walls of the contraction tube 1, the throat tube 2, and the diffuser tube 3.

[0045] There are two orifices 5, and they are centrally symmetrical along the axis of throat 2.

Claims

1. A Venturi scrubber built into a coal gasification scrubbing tower, characterized in that, Includes a constriction tube (1), which is a cone shape with open ends. The conical diffuser end of the constriction tube (1) is an air inlet. The conical constriction end of the constriction tube (1) is fixedly connected to the throat tube (2) and the diffuser tube (3) in sequence. The diffuser tube (3) is a cone shape with open ends. The conical constriction end of the diffuser tube (3) is fixedly connected to one end of the throat tube (2). The conical diffuser end of the diffuser tube (3) is an air outlet. The throat tube (2) is a tube of equal diameter. A nozzle (6) is opened on the side wall of the throat tube (2). A cylinder (4) is fitted on the outer wall of the throat tube (2). A pipe opening (5) is opened on the cylinder (4). There are gaps between the inner wall of the cylinder (4) and the outer walls of the constriction tube (1), the throat tube (2), and the diffuser tube (3).

2. The Venturi scrubber built into a coal gasification scrubbing tower according to claim 1, characterized in that, The cylinder (4) includes a connecting cylinder (403), with an upper cap (401) and a lower cap (402) fixedly connected to both ends of the connecting cylinder (403). The upper cap (401) is a circular cap with a through hole on its surface, and the inner wall of the through hole is fixedly connected to the outer wall of the shrink tube (1). The lower cap (402) is a circular cap with a through hole on its surface, and the inner wall of the through hole is fixedly connected to the outer wall of the diffuser tube (3).

3. The Venturi scrubber built into a coal gasification scrubbing tower according to claim 2, characterized in that, The connecting cylinder (403) has an opening (5) on its side wall. The inner diameter of the opening (5) is φ80mm-100mm. The distance between the center of the opening (5) and the connection between the connecting cylinder (403) and the lower cover (402) is 200mm-330mm.

4. The Venturi scrubber built into a coal gasification scrubbing tower according to claim 1, characterized in that, The nozzle (6) opens obliquely to the outer wall of the throat (2) along the air outlet direction, and the angle between the oblique axis of the nozzle and the axis of the throat (2) is 30°-45°.

5. The Venturi scrubber built into a coal gasification scrubbing tower according to claim 1, characterized in that, The number of nozzles (6) is 4-12.

6. The Venturi scrubber built into a coal gasification scrubbing tower according to claim 1, characterized in that, The conical diffuser opening of the conical tube (1) has an inner diameter of φ488mm-588mm, an inner diameter of φ250mm-350mm, a length of 510mm-610mm, and an inner wall taper of 25°-35°.

7. The Venturi scrubber built into a coal gasification scrubbing tower according to claim 1, characterized in that, The throat tube (2) has an inner diameter of φ250mm-350mm, a length of 550mm-650mm, and an inner wall roughness of Ra1.6μm-1.8μm.

8. The Venturi scrubber built into a coal gasification scrubbing tower according to claim 1, characterized in that, The inner diameter of the conical contraction end of the diffuser tube (3) is φ250mm-350mm, the inner diameter of the conical diffusion end is φ488mm-588mm, the length is 1600mm-1800mm, and the diffusion angle is 7°-10°.

9. The Venturi scrubber built into a coal gasification scrubbing tower according to claim 1, characterized in that, There are two openings (5), and they are centrally symmetrical along the axis of the throat (2).

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