A high dust-containing waste gas water washing recycling system and a water washing method thereof

Abstract

The application relates to the technical field of dust-containing environment treatment, and discloses a high-dust-containing waste gas water washing recycling system and a water washing method thereof, which comprises a fixed outer tank, a sealing plate fixedly arranged on the fixed outer tank, and a mounting plate fixedly arranged on the sealing plate; further comprises: an extrusion structure which comprises an extrusion vertical cylinder fixedly arranged on the mounting plate, a gas conveying pipeline fixedly arranged on the extrusion vertical cylinder, one end of the gas conveying pipeline away from the extrusion vertical cylinder penetrating through the mounting plate and extending out, and a connecting pipe fixedly arranged on the gas conveying pipeline; and a shearing structure which comprises a positioning plate fixedly arranged on the mounting plate and located above the extrusion vertical cylinder, and a motor fixedly arranged on the positioning plate. The application can effectively improve the fine dust capturing effect, reduce the liquid-gas ratio required for system operation, significantly reduce the washing water consumption, avoid the airflow short circuit phenomenon, and relieve the problem of large fluctuation of dust removal efficiency.

Description

Technical Field

[0001] This invention relates to the field of dusty environment treatment technology, specifically to a high-dust-content waste gas washing and reuse system and its washing method. Background Technology

[0002] With rapid economic growth, the number of electric arc furnaces for metallurgical steelmaking and coal-fired boilers has increased significantly. The air pollutants emitted by these industrial furnaces pose a serious threat to the surrounding environment. Efficiently separating and removing these particulate matter from dusty flue gas to reduce its emissions into the atmosphere is becoming increasingly important.

[0003] Chinese Patent CN113634083A discloses a combined dust removal device and method for a nickel-iron alloy smelting plant, comprising: a main flue with two branch flues connected to an electric arc furnace and a rotary kiln respectively; a cyclone dust collector connected to the main flue, forming a two-stage cyclone dust collector for two-stage separation and filtration of the flue gas; a centrifugal fan sending the flue gas into a wet scrubber for water bath washing and spray washing, and discharging the clean air after demisting into the atmosphere; the wet scrubber includes a water bath zone, a spray washing zone, and a demisting and water collection zone, arranged sequentially from bottom to top, with an automatic overflow port on the side wall of the water bath zone and a water inlet on the side wall of the spray washing zone; a buffer tank providing circulating water for a circulating pump, which delivers the circulating water to the wet scrubber through the water inlet and returns it to the buffer tank through the automatic overflow port, in a reciprocating cycle. This invention can handle high-temperature flue gas from rotary kilns and electric arc furnaces in nickel-iron smelters. The process is simple, the investment cost is low, the dust removal effect is good, and the efficiency is high.

[0004] However, this technology still has some technical problems: conventional stirring and washing dust removal relies solely on water mist to capture dust, which has a low efficiency in capturing fine dust, requires a larger liquid-to-gas ratio and a larger water consumption, is prone to airflow short circuits, and has large fluctuations in dust removal efficiency.

[0005] Therefore, this invention proposes a water washing and reuse system for high dust content waste gas and its water washing method. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a high-dust-content waste gas washing and reuse system and its washing method. By combining shearing and extrusion foaming with cyclone refinement, the system achieves efficient capture of fine dust, reduces washing water consumption, and avoids airflow short-circuiting.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a high-dust-content waste gas washing and reuse system, comprising: a fixed outer tank, a sealing plate fixedly disposed on the fixed outer tank, and an mounting plate fixedly disposed on the sealing plate;

[0009] Its characteristic is that it further includes:

[0010] The extrusion structure includes an extrusion cylinder fixedly mounted on the mounting plate, an air supply pipe fixedly mounted on the extrusion cylinder, one end of the air supply pipe away from the extrusion cylinder passing through the mounting plate and extending out, and a connecting pipe fixedly mounted on the air supply pipe.

[0011] The shearing structure includes a positioning plate fixedly mounted on the mounting plate and located above the extrusion cylinder, a motor fixedly mounted on the positioning plate, a rotating shaft fixedly mounted on the output end of the motor, and a shearing assembly fixedly mounted on the rotating shaft.

[0012] And an exhaust pipe fixedly mounted on the mounting plate.

[0013] Preferably, the shearing assembly includes a mounting base fixedly disposed on the top end of the rotating shaft, a base plate fixedly disposed on the mounting base, and blades fixedly disposed on the base plate and arranged in a circular pattern.

[0014] Preferably, the outer diameter of the base plate is smaller than the inner diameter of the extrusion cylinder, and an extrusion gap is provided between the outer edge of the blade and the extrusion cylinder.

[0015] Preferably, an annular cover is fixedly provided on the blade, and the annular cover is located inside the extrusion cylinder.

[0016] Preferably, a support plate is fixedly disposed on the base plate, and the outer diameter of the support plate is equal to the outer diameter of the base plate.

[0017] Preferably, a plurality of turbulence racks are fixedly provided on the support plate, and the plurality of turbulence racks are arranged at uniform intervals along the circumference of the support plate.

[0018] Preferably, a flow guide cap is fixedly installed on the rotating shaft and above the outlet end of the gas transmission pipeline. The flow guide cap is a cone shape with the apex pointing downwards, and multiple spiral blades are fixedly installed at circumferential intervals on the outer conical surface of the flow guide cap.

[0019] Preferably, an inner tank is fixedly mounted on the mounting plate, a support base is fixedly mounted on the inner tank, and a filtrate baffle is fixedly mounted on the support base.

[0020] Preferably, a water supply valve is fixedly installed on the outer tank, and an end hole is provided on the inner tank.

[0021] Preferably, a discharge component and a fixing frame are fixedly installed on the fixed outer tank, a data control box is fixedly installed on the fixing frame, and a dosing tank is fixedly installed on the side of the fixing frame.

[0022] Secondly, the present invention provides a water washing method for a high-dust-content waste gas water washing and reuse system, comprising the following steps:

[0023] S1: The external gas to be processed is sent into the extrusion cylinder through the gas supply pipe;

[0024] S2: Start the motor to drive the shaft, which in turn drives the blades to rotate. The gas and water are squeezed and sheared through the pressure gap, and the gas and water are mixed and dispersed to form a bubble layer.

[0025] S3: The bubble-mixed fluid rises to the guide cap and the spiral blades, where it is subjected to secondary shearing by the synchronously rotating spiral blades, and is then gathered by the guide cap into the swirling action area;

[0026] S4: The turbulence rack rotates synchronously, stirring the dust-containing bubble mixture near the extrusion cylinder, forming a downward turbulent flow and driving the liquid below to flow back upward, replenishing the blade extrusion gap;

[0027] S5: The gas after washing is discharged through the exhaust pipe, and the pH of the water is adjusted by the dosing tank. The washing water is circulated between the fixed outer tank and the inner tank.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention can effectively improve the fine dust collection effect, reduce the liquid-to-gas ratio required for system operation, significantly reduce the consumption of washing water, avoid airflow short-circuiting, alleviate the problem of large fluctuations in dust removal efficiency, have stronger adaptability to fluctuating working conditions of dust-laden exhaust gas flow and dust concentration, and at the same time, it can inhibit dust settling and accumulation, realize long-term recycling of washing water, and reduce the operation and maintenance costs during continuous operation of the equipment. Attached Figure Description

[0029] Figure 1 Schematic diagram of the extrusion and shearing structures of a high-dust-content waste gas washing and reuse system;

[0030] Figure 2 A cross-sectional schematic diagram of the inner tank of a high-dust-content waste gas washing and reuse system;

[0031] Figure 3 A cross-sectional schematic diagram of the extrusion vertical cylinder for a high-dust-content waste gas washing and reuse system;

[0032] Figure 4 A schematic diagram of the annular enclosure for a high-dust-content waste gas washing and reuse system;

[0033] Figure 5 A schematic diagram of auxiliary components for a high-dust-content waste gas washing and reuse system;

[0034] Figure 6 Schematic diagram of the mounting base for a high-dust-content waste gas washing and reuse system;

[0035] Figure 7 Schematic diagram of the mounting frame for a high-dust-content waste gas washing and reuse system;

[0036] Figure 8 A schematic diagram of a high-dust-content waste gas washing and reuse system;

[0037] Figure 9 This is a schematic diagram of the water supply valve for a high-dust-content waste gas washing and reuse system.

[0038] Explanation of reference numerals in the attached drawings: 101, fixed outer tank; 102, sealing plate; 103, mounting plate; 104, inner tank; 104a, end hole; 105, water supply valve; 200, extrusion structure; 201, extrusion vertical cylinder; 202, gas transmission pipeline; 203, connecting pipe; 204, support base; 205, filtrate baffle; 300, shearing structure; 301, motor; 302, positioning plate; 303, rotating shaft; 303a, mounting base; 304, bottom plate; 305, impeller; 306, annular seal; 307, bearing plate; 308, turbulence rack; 309, flow guide cap; 310, spiral blade; 401, exhaust pipe; 501, discharge component; 601, fixing frame; 701, data control box; 801, dosing tank. Detailed Implementation

[0039] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations thereof.

[0040] Example 1

[0041] like Figure 1 - Figure 9 As shown, this embodiment provides a high-dust-content waste gas washing and reuse system, including a fixed outer tank 101, a sealing plate 102 fixedly disposed on the fixed outer tank 101, and an mounting plate 103 fixedly disposed on the sealing plate 102;

[0042] Also includes:

[0043] The extrusion structure 200 includes an extrusion cylinder 201 fixedly mounted on the mounting plate 103, an air supply pipe 202 fixedly mounted on the extrusion cylinder 201, one end of the air supply pipe 202 away from the extrusion cylinder 201 passing through the mounting plate 103 and extending out, and a connecting pipe 203 fixedly mounted on the air supply pipe 202.

[0044] The shearing structure 300 includes a positioning plate 302 fixedly mounted on the mounting plate 103 and located above the extrusion cylinder 201, a motor 301 fixedly mounted on the positioning plate 302, a rotating shaft 303 fixedly mounted on the output end of the motor 301, and a shearing assembly fixedly mounted on the rotating shaft 303; and an exhaust pipe 401 fixedly mounted on the mounting plate 103. An inner tank 104 is fixedly mounted on the mounting plate 103, a support base 204 is fixedly mounted on the inner tank 104, and a filtrate baffle 205 is fixedly mounted on the support base 204. The filtrate baffle 205 supported by the support base 204 is used to achieve liquid phase partitioning inside the chamber, intercept large particulate dust solid phase, allow washing water to penetrate and return, and form a layered isolation between the supernatant circulating liquid phase and the bottom settling sludge zone.

[0045] The shearing assembly includes a mounting base 303a fixedly mounted on the top of the rotating shaft 303, a base plate 304 fixedly mounted on the mounting base 303a, and blades 305 fixedly mounted on the base plate 304 and arranged circumferentially. The outer diameter of the base plate 304 is smaller than the inner diameter of the extrusion cylinder 201, and an extrusion gap is provided between the outer edge of the blades 305 and the extrusion cylinder 201. An annular cover 306 is fixedly mounted on the blades 305 and is located inside the extrusion cylinder 201.

[0046] The gas to be processed is connected to the inlet of the gas delivery pipe 202 via the connecting pipe 203. The gas then enters the extrusion cylinder 201 connected to the motor 301 through the outlet of the gas delivery pipe 202. The output end of the motor 301 is connected to the rotating shaft 303. A centrifugal impeller is composed of a base plate 304 on the mounting base 303a on the rotating shaft 303, blades 305 on the base plate 304, and an annular cover 306. The centrifugal impeller draws in air from the center, and then the blades 305 disperse the air to the sides. During this side dispersion, water covers the outlet of the centrifugal impeller. The rotation of the rotating shaft 303, controlled by the motor 301, drives the centrifugal impeller to rotate. The rotating impeller simultaneously disperses the gas and water to be processed. The gas becomes a thick bubble layer, and the generated bubbles become the medium for capturing dust in the gas. The compression gap between the centrifugal impeller and the compression cylinder 201 utilizes the narrow annular gap to form a throttling space. The gas and liquid phases thrown out by the blade 305 are forced to be compressed and sheared violently within the gap, which greatly increases the bubble generation density and bubble stability, constrains the gas and liquid flow path, and forces all waste gas and washing water to pass through the outer edge shearing area of ​​the blade 305, reducing the possibility of airflow short-circuiting and gas-liquid bypass escape. Because it is in the compression cylinder 201 and the inner tank 104, the water level will also rise, forming a bubble layer that can cover the entire centrifugal impeller. This achieves the purpose of gas water washing dust removal by allowing dust and fine dust to come into contact with water in the gas.

[0047] When the gas flow rate and speed in the intake pipe are very high, the gas absorbed by the centrifugal impeller is dispersed to the circumferential side. The exhaust pipe 401 located above the liquid surface discharges the washed gas, which can blow the water droplets that tend to splash upwards during the working process downwards. The water droplets that tend to splash upwards will stay in the inner tank 104 and then flow back into the extrusion vertical cylinder 201. Only the processed gas flows away.

[0048] The treated gas is deposited at the bottom of the external fixed tank. A discharge component 501 is connected to the tank body. One side port of the discharge component 501 discharges compressed air for subsequent collection and treatment, while the other side port discharges washing water and impurities. The working principle of this part is prior art, which will be clearly understood by those skilled in the art, and will not be described in detail here.

[0049] A support plate 307 is fixedly mounted on the base plate 304, and the outer diameter of the support plate 307 is equal to the outer diameter of the base plate 304. Multiple baffle racks 308 are fixedly mounted on the support plate 307, and these baffle racks are evenly spaced along the circumference of the support plate 307. A guide cap 309 is fixedly mounted on the rotating shaft 303 and above the outlet end of the gas transmission pipeline 202. The guide cap 309 is conical with its apex pointing downwards, and multiple spiral blades 310 are fixedly mounted circumferentially on the outer conical surface of the guide cap 309.

[0050] The gas-liquid mixture generated by the extrusion gap impacts upwards onto the swirling system composed of the guide cap 309 and the spiral blades 310. The guide cap 309 and the spiral blades 310, together with the base plate 304, the paddles 305 on the base plate 304, and the annular cover 306, form a centrifugal impeller that rotates synchronously. The synchronously rotating spiral blades 310 perform secondary shearing on the gas-liquid mixture, further breaking down the large bubbles formed during the extrusion shearing process and generating a large number of microbubbles, increasing the specific surface area for dust adsorption. The gas-liquid mixture rising from the extrusion gap is gathered and constrained by the conical guide cap 309, forcing all the airflow into the swirling action area of ​​the spiral blades 310. This eliminates the short-circuit channel for gas to escape directly along the inner wall of the extrusion cylinder 201 and above the liquid surface, preventing some dust-laden waste gas from being discharged directly without sufficient contact with the gas and liquid, improving the gas treatment efficiency, effectively alleviating the problem of large fluctuations in dust removal efficiency, and enhancing the system's adaptability to fluctuating conditions of high dust-laden waste gas.

[0051] The turbulence rack 308, rotating at high speed synchronously with the centrifugal impeller, continuously agitates and compresses the dust-laden mixture near the vertical cylinder 201, preventing the captured dust from settling and accumulating. This ensures that the washing medium continuously participates in foaming and dust removal, achieving preliminary recycling of wastewater. The downward turbulent flow drives the liquid below the vertical cylinder 201 to flow upwards back, continuously supplying water to the extrusion gap of the impeller 305, forming a self-circulating liquid phase inside the inner tank 104, eliminating the need for continuous replenishment of large amounts of fresh washing water.

[0052] Furthermore, a water supply valve 105 is fixedly installed on the fixed outer tank 101, and an end hole 104a is provided on the inner tank 104. A discharge component 501 and a fixing frame 601 are fixedly installed on the fixed outer tank 101. A data control box 701 is fixedly installed on the fixing frame 601, and a dosing tank 801 is fixedly installed on the side of the fixing frame 601.

[0053] During operation, the gases to be processed contain acids and alkalis. These acids and alkalis dissolve in water, causing the water in the tank to become acidic and alkaline. There is an acid-base neutralization mechanism. Once the acid-base level exceeds the set range, the data control box 701 controls the dosing tank 801 to add alkali or acid to achieve acid-base neutralization. The working principle of this part is existing technology, which can be clearly understood by those skilled in the art, and will not be elaborated here. It can neutralize the water in the fixed outer tank 101 and inner tank 104, so that the water in the tank can be used for a long time. Moreover, when the water level in the tank does not match the preset value, water can be added quantitatively through the water inlet valve 105 on the water inlet pipe.

[0054] Example 2

[0055] like Figure 1 - Figure 9 As shown, this embodiment provides a water washing method for a high-dust-content waste gas water washing and reuse system. This water washing method operates using the high-dust-content waste gas water washing and reuse system in Embodiment 1, and includes the following steps:

[0056] S1: External gas to be processed is sent into the extrusion cylinder 201 through the gas supply pipe 202;

[0057] S2: Start motor 301 drives shaft 303, which drives blade 305 to rotate. Through the pressure gap, the gas and water are squeezed and sheared, and the gas and water are mixed and dispersed to form a bubble layer.

[0058] S3: The bubble-mixed fluid rises to the guide cap 309 and the helical blade 310, where it is subjected to secondary shearing by the synchronously rotating helical blade 310, and is then gathered into the swirling action area by the guide cap 309;

[0059] S4: The turbulence rack 308 rotates synchronously, stirring and extruding the dust-laden bubble mixture near the vertical cylinder 201, forming a downward turbulent flow and driving the liquid below to flow back upward, replenishing the extrusion gap of the blade 305.

[0060] S5: The gas after washing is discharged through the exhaust pipe 401. The pH of the water is adjusted by the dosing tank 801. The washing water is circulated between the fixed outer tank 101 and the inner tank 104.

[0061] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-dust-content waste gas washing and reuse system, comprising: A fixed outer tank (101), a sealing plate (102) fixedly disposed on the fixed outer tank (101), and a mounting plate (103) fixedly disposed on the sealing plate (102). Its characteristic is that it further includes: The extrusion structure (200) includes an extrusion cylinder (201) fixedly mounted on the mounting plate (103), an air supply pipe (202) fixedly mounted on the extrusion cylinder (201), the end of the air supply pipe (202) away from the extrusion cylinder (201) passing through the mounting plate (103) and extending out, and a connecting pipe (203) fixedly mounted on the air supply pipe (202). The shearing structure (300) includes a positioning plate (302) fixedly mounted on the mounting plate (103) and located above the extrusion cylinder (201), a motor (301) fixedly mounted on the positioning plate (302), a rotating shaft (303) fixedly mounted on the output end of the motor (301), and a shearing assembly fixedly mounted on the rotating shaft (303). And an exhaust pipe (401) fixedly mounted on the mounting plate (103).

2. The high-dust-content waste gas washing and reuse system according to claim 1, characterized in that, The shearing assembly includes a mounting base (303a) fixedly disposed on the top of the rotating shaft (303), a base plate (304) fixedly disposed on the mounting base (303a), and blades (305) fixedly disposed on the base plate (304) and arranged in a circular pattern.

3. The high-dust-content waste gas washing and reuse system according to claim 2, characterized in that, The outer diameter of the base plate (304) is smaller than the inner diameter of the extrusion cylinder (201), and an extrusion gap is provided between the outer edge of the blade (305) and the extrusion cylinder (201).

4. The high-dust-content waste gas washing and reuse system according to claim 3, characterized in that, An annular cover (306) is fixedly installed on the blade (305), and the annular cover (306) is located inside the extrusion cylinder (201).

5. A high-dust-content waste gas washing and reuse system according to claim 4, characterized in that, A support plate (307) is fixedly installed on the base plate (304), and the outer diameter of the support plate (307) is equal to the outer diameter of the base plate (304).

6. A high-dust-content waste gas washing and reuse system according to claim 5, characterized in that, A plurality of turbulence racks (308) are fixedly provided on the support plate (307), and the plurality of turbulence racks (308) are evenly spaced along the circumference of the support plate (307).

7. A high-dust-content waste gas washing and reuse system according to claim 6, characterized in that, A flow guide cap (309) is fixedly installed on the rotating shaft (303) and above the outlet end of the gas transmission pipeline (202). The flow guide cap (309) is a cone with the apex pointing downwards. Multiple spiral blades (310) are fixedly installed on the outer cone surface of the flow guide cap (309) at intervals along the circumference.

8. A high-dust-content waste gas washing and reuse system according to claim 7, characterized in that, An inner tank (104) is fixedly installed on the mounting plate (103), a support base (204) is fixedly installed on the inner tank (104), and a filtrate baffle (205) is fixedly installed on the support base (204).

9. A high-dust-content waste gas washing and reuse system according to claim 8, characterized in that, A water supply valve (105) is fixedly installed on the fixed outer tank (101), and an end hole (104a) is provided on the inner tank (104).

10. A high-dust-content waste gas washing and reuse system according to claim 9, characterized in that, The fixed outer tank (101) is fixedly provided with a discharge component (501) and a fixed frame (601). The fixed frame (601) is fixedly provided with a data control box (701). The side of the fixed frame (601) is fixedly provided with a dosing tank (801).

11. A water washing method based on the high-dust-content waste gas water washing and reuse system according to claim 10, characterized in that, Includes the following steps: S1: The external gas to be processed is sent into the extrusion cylinder (201) through the gas supply pipe (202); S2: Start the motor (301) to drive the rotating shaft (303), which in turn drives the blade (305) to rotate. The gas and water are squeezed and sheared through the pressure gap, and the gas and water are mixed and dispersed to form a bubble layer. S3: The bubble-mixed fluid rises to the guide cap (309) and the helical blade (310), where it is subjected to secondary shearing by the synchronously rotating helical blade (310), and is then gathered into the swirling action area by the guide cap (309); S4: The turbulence rack (308) rotates synchronously, stirring the dust-laden bubble mixture near the extrusion cylinder (201), forming a downward turbulent flow and driving the liquid below to flow back upward, replenishing the extrusion gap of the blade (305); S5: The gas after washing is discharged through the exhaust pipe (401), and the acidity and alkalinity of the water are adjusted by the dosing tank (801). The washing water is circulated between the fixed outer tank (101) and the inner tank (104).

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