A high-efficiency chemical deodorization device and method

Abstract

The invention discloses a high-efficiency chemical deodorization device and method, comprising: an absorption liquid storage tank, an air inlet of the absorption liquid storage tank is connected to a reaction tube, an air outlet of the absorption liquid storage tank is connected to a demister, a liquid spraying pipe, the lower end of the liquid spraying pipe is connected to the reaction tube, the upper end of the liquid spraying pipe is connected to an external fan, a circulation mechanism, the extraction end of the circulation mechanism is connected to the liquid outlet of the absorption liquid storage tank, and the discharge end of the circulation mechanism is connected to the liquid spraying pipe. The high-efficiency chemical deodorization device adopts gas-liquid co-current chemical technology, the device has a large processing capacity, a small pressure drop, and no liquid flooding phenomenon occurs, and can significantly reduce the tower diameter and tower height, thereby reducing the investment cost of the device.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical deodorization, and more specifically, relates to a high-efficiency chemical deodorization device and method. Background Art

[0002] Chemical deodorization technology is the process of absorbing and removing gaseous pollutants in malodorous gases through chemical absorption solutions. The absorption process can be classified into two types according to the gas-liquid contact form: cocurrent (parallel) absorption and countercurrent (countercurrent) absorption. At present, countercurrent absorption is the mainstream process of chemical deodorization technology. Although it has the advantage of a higher absorption rate, it also has the disadvantages of too small gas-liquid contact interface area, resulting in low mass transfer and reaction efficiency, as well as easy to produce liquid flooding and large pressure loss. Summary of the invention

[0003] The purpose of the present invention is to provide a high-efficiency chemical deodorization device in view of the deficiencies in the prior art. The high-efficiency chemical deodorization device adopts gas-liquid co-current chemical technology, has a large processing capacity, a small pressure drop, and no liquid flooding. It can significantly reduce the tower diameter and tower height, and reduce the investment cost of the device.

[0004] In order to achieve the above object, the present invention provides a high-efficiency chemical deodorization device, comprising:

[0005] An absorption liquid storage tank, wherein the air inlet of the absorption liquid storage tank is connected to a reaction tube, and the air outlet of the absorption liquid storage tank is connected to a demister;

[0006] A liquid spray pipe, the lower end of which is connected to the reaction tube, and the upper end of which is connected to an external fan;

[0007] A circulation mechanism, wherein the extraction end of the circulation mechanism is connected to the liquid outlet of the absorption liquid storage tank, and the discharge end of the circulation mechanism is connected to the liquid spray pipe.

[0008] Optionally, a plurality of screens are arranged in the reaction tube, and the plurality of screens are stacked in the reaction tube.

[0009] Optionally, a support ring is provided between adjacent screens.

[0010] Optionally, the absorption liquid storage tank is provided with a dosing port, an observation port, a tank emptying port and a tank overflow port.

[0011] Optionally, the liquid spray pipe is provided with a liquid spray pipe external interface and a spare liquid spray pipe external interface, and the discharge end of the circulation mechanism is connected to the liquid spray pipe external interface.

[0012] Optionally, a nozzle is provided inside the liquid spray pipe, and the nozzle is connected to an external interface of the liquid spray pipe.

[0013] Optionally, the circulation mechanism is a circulation pump, and the mesh opening rate of the mesh is 92-96%.

[0014] Optionally, the drain pipe of the demister is connected to the absorption liquid storage tank.

[0015] A high-efficiency chemical deodorization method, using the high-efficiency chemical deodorization equipment, comprises:

[0016] Setting the reagent in the absorption liquid storage tank;

[0017] Starting the external fan to allow the treated gas to enter the absorption liquid storage tank through the liquid spray pipe and the reaction pipe;

[0018] Start the circulation mechanism to make the reagent in the absorption liquid storage tank circulate between the liquid outlet and the liquid spray pipe.

[0019] Optionally, it further comprises: deodorizing the treated gas by using a plurality of said high-efficiency chemical deodorizing devices;

[0020] The liquid spray pipes of multiple high-efficiency chemical deodorization devices are all connected to an external fan, or the liquid spray pipe of the high-efficiency chemical deodorization device mentioned in the previous sequence is connected to the external fan, and the liquid spray pipe of the high-efficiency chemical deodorization device mentioned in the subsequent sequence is connected to the defogger of the high-efficiency chemical deodorization device mentioned in the previous sequence.

[0021] The present invention provides a high-efficiency chemical deodorizing device, which has the following beneficial effects:

[0022] 1. This high-efficiency chemical deodorization device adopts gas-liquid co-current chemical technology, with large processing capacity, small pressure drop, and no liquid flooding. It can significantly reduce the tower diameter and tower height, and reduce the investment cost of the device.

[0023] 2. The high-efficiency chemical deodorization device increases the gas-liquid reaction contact surface through the combination of a tiny droplet nozzle and a multi-layer three-dimensional screen, and has the advantages of high gas-liquid mass transfer efficiency and good deodorization effect. In addition, the three-dimensional screen composed of multiple layers of screens is also conducive to the absorption liquid droplets gradually increasing in size and falling into the storage tank, thereby improving the recovery rate of the absorption liquid, reducing the loss of the absorption liquid, and having the advantage of low processing cost.

[0024] 3. This high-efficiency chemical deodorization device has the advantages of good deodorization effect, low investment and processing cost, simple structure and easy operation, and has good economic and application value.

[0025] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0027] Figure 1 A schematic structural diagram of a high-efficiency chemical deodorization device according to an embodiment of the present invention is shown.

[0028] Figure 2 A schematic structural diagram of a high-efficiency chemical deodorization device according to an embodiment of the present invention is shown.

[0029] Figure 3 A schematic structural diagram of a high-efficiency chemical deodorization device according to an embodiment of the present invention is shown.

[0030] Description of reference numerals:

[0031] 1. Liquid spray pipe; 2. External interface of liquid spray pipe; 2', external interface of spare liquid spray pipe; 3. Circulation mechanism; 4. Reaction tube; 5. Absorption liquid storage tank; 6. Dosing port; 7. Observation port; 8. Liquid outlet; 9. Storage tank emptying port; 10. Storage tank overflow port; 11. Air outlet; 12. Demister; 13. Nozzle; 14. Three-dimensional screen; 15. Support ring. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0033] Figure 1 A schematic structural diagram of a high-efficiency chemical deodorization device according to an embodiment of the present invention is shown; Figure 2 A schematic structural diagram of a high-efficiency chemical deodorization device according to an embodiment of the present invention is shown; Figure 3 A schematic structural diagram of a high-efficiency chemical deodorization device according to an embodiment of the present invention is shown.

[0034] like Figure 1-3 As shown, a high-efficiency chemical deodorization device comprises:

[0035] An absorption liquid storage tank 5, wherein the air inlet of the absorption liquid storage tank 5 is connected to the reaction tube 4, and the air outlet 11 of the absorption liquid storage tank 5 is connected to the demister 12;

[0036] A liquid spray pipe 1, the lower end of the liquid spray pipe 1 is connected to the reaction tube 4, and the upper end of the liquid spray pipe 1 is connected to an external fan;

[0037] The circulation mechanism 3 has an extraction end connected to a liquid outlet 8 of an absorption liquid storage tank 5 , and a discharge end connected to a liquid spray pipe 1 .

[0038] Specifically, odor is absorbed by an external fan, and the absorption liquid in the absorption liquid storage tank 5 is circulated and sprayed through the circulation mechanism 3, so that the absorption liquid contacts and reacts with the odor in the reaction tube 4, and the gas mist after the purification reaction is filtered by the absorption liquid through the demister 12 and then discharged, so that the gas and liquid flow in the same direction, the pressure drop during absorption is smaller, the gas velocity and liquid flow rate can be larger, and the existence of liquid flooding phenomenon is eliminated, so as to achieve the effects of good deodorization effect, high gas-liquid mass transfer efficiency, small pressure drop, small tower diameter, low height and simple structure and operation.

[0039] Furthermore, the effective volume of the absorption liquid storage tank 5 is 50-80% of the total volume, and the effective volume should at least meet the rated flow volume of the circulation mechanism 3 5min, the demister 12 includes a folded plate type and a packing ring, and the superficial velocity range is 1-4m / s.

[0040] In this embodiment, a plurality of screens 14 are disposed in the reaction tube 4 , and the plurality of screens 14 are stacked in the reaction tube 4 .

[0041] Specifically, the screen 14 is composed of 1-4 layers of flat screens, the mesh is square, the side length is 0.5-5mm, and the screen opening rate is 92-96%. The screens 14 are stacked to form a three-dimensional screen to increase the gas-liquid reaction contact surface, improve the gas-liquid mass transfer efficiency and deodorization effect.

[0042] In this embodiment, a support ring 15 is provided between adjacent screens.

[0043] Specifically, the screen 14 is separated by the support ring 15 to ensure the shape and structure of the three-dimensional screen, and the size of the support ring 15 is 5-30 cm.

[0044] In this embodiment, the absorption liquid storage tank 5 is provided with a dosing port 6 , an observation port 7 , a tank emptying port 9 and a tank overflow port 10 .

[0045] In this embodiment, the liquid spraying pipe 1 is provided with a liquid spraying pipe external interface 2 and a spare liquid spraying pipe external interface 2 ′, and the discharge end of the circulation mechanism 3 is connected to the liquid spraying pipe external interface 2 .

[0046] Specifically, the external interfaces 2 of the liquid spraying pipe are arranged at different heights to meet the requirements of different parameters.

[0047] In this embodiment, a nozzle 13 is disposed inside the liquid spraying pipe 1 , and the nozzle 13 is connected to the external interface 2 of the liquid spraying pipe.

[0048] Specifically, the nozzle 13 is arranged on the axis of the liquid spray pipe, located above the screen 14, with the opening direction facing the screen 14. The height of the liquid spray pipe 1 and the reaction tube 4 are both 0.5-1m, and the flow rate of the malodorous gas in the above two pipelines is 8-16m / s. The nozzle 13 is a tiny droplet nozzle, which cooperates with the screen 14 to increase the gas-liquid contact surface.

[0049] Furthermore, the median diameter VMD of the droplet volume of the nozzle 13 is less than 500 μm, and the 3 The amount of circulating spray liquid required for malodorous gas is 3-6m 3 .

[0050] In this embodiment, the circulation mechanism is a circulation pump, and the mesh opening rate of the mesh is 92-96%.

[0051] In this embodiment, the liquid discharge pipe of the demister 12 is connected to the absorption liquid storage tank 5 .

[0052] Specifically, recycling and improving utilization rate.

[0053] A high-efficiency chemical deodorization method, using the high-efficiency chemical deodorization equipment, comprises:

[0054] Setting the reagent in the absorption liquid storage tank;

[0055] Start the external fan to allow the treated gas to enter the absorption liquid storage tank through the liquid spray pipe and the reaction pipe;

[0056] Start the circulation mechanism to make the reagent in the absorption liquid storage tank circulate between the liquid outlet and the liquid spray pipe.

[0057] Specifically, the agent is prepared so that the agent in the absorption liquid storage tank at least meets the rated flow volume passing through the circulation mechanism 3 within the minimum working time to avoid empty burning;

[0058] Adjust the operating rates of the circulation mechanism 3 and the external fan so that the replacement rate is not less than 50%;

[0059] The air flow rate of the demister is adjusted so that the recovery rate of the liquefied reagent is greater than 90%.

[0060] By maintaining sufficient medicine to meet the minimum circulation dosage of the cycle, the flow rates of the medicine liquid and the odor are changed by adjusting the circulation mechanism 3 and the external fan, thereby changing the reaction time of the medicine liquid and the odor.

[0061] In this embodiment, it also includes: deodorizing the treated gas by using a plurality of high-efficiency chemical deodorization devices;

[0062] The liquid spray pipes of multiple high-efficiency chemical deodorization devices are all connected to an external fan, or the liquid spray pipe of the preceding high-efficiency chemical deodorization device is connected to an external fan, and the liquid spray pipe of the subsequent high-efficiency chemical deodorization device is connected to the defogger of the preceding high-efficiency chemical deodorization device.

[0063] Specifically, the high-efficiency chemical deodorization devices are connected in series or in parallel to improve the processing capacity.

[0064] When the high-efficiency chemical deodorization equipment of this embodiment is used, taking the treatment of odor as an example,

[0065] 1. Device design and implementation

[0066] According to application requirements, the high-efficiency chemical deodorization device can be used in single stage, series or parallel. When used in series, 2-4 stages of series connection are selected according to the gas volume and odor gas concentration. Design according to the above technical solution, complete the processing, installation and commissioning of the device.

[0067] 2. Preparation of absorption liquid

[0068] After completing the work in step 1, the absorption liquid must be prepared first. The method can refer to the relevant methods of reverse flow chemical deodorization. When removing ammonia and organic ammonia compounds, use sulfuric acid aqueous solution, and the corresponding pH value range is 2-4. When removing hydrogen sulfide and organic odor pollutants, use sodium hypochlorite aqueous solution alone or in combination with sodium hydroxide aqueous solution. The concentration of sodium hypochlorite aqueous solution (in terms of chlorine) is 0.5-1g / L. When used in combination with sodium hydroxide aqueous solution, the pH range is 9-10.

[0069] During the operation of the equipment, the replenishment of chemical agents is controlled by online instruments.

[0070] 3. Equipment operation

[0071] After the concentration prepared in step 2 is met and the rated flow volume of the circulation mechanism is met for at least 5 minutes, the circulation mechanism and the odorous gas supply fan are turned on to meet the flow rate of the odorous gas in the spray pipe and the reaction pipe of 8-16m / s and each treatment of 1000Nm 3 The circulating spray volume of malodorous gas ranges from 3 to 6 m 3 The absorption liquid in the absorption liquid storage tank needs to be replaced regularly according to actual conditions.

[0072] When sulfuric acid aqueous solution is used to remove ammonia and organic amines, the ammonium sulfate is greater than 50g / L;

[0073] When sodium hypochlorite or sodium hydroxide is used in combination, sulfate is greater than 15 g / L;

[0074] The above replacement rate is at least 50%.

[0075] 4. Absorption liquid recovery

[0076] The treated malodorous gas carries part of the absorption liquid, which needs to be recovered by a demister. The flow rate control range of the demister hollow tower is 1-4m / s, and the recovery rate must be greater than 90%.

[0077] 5. Device shutdown

[0078] When the device needs to stop running, the circulating water pump should be turned off and the air supply should be stopped. If the device is restarted after a long shutdown, the absorption liquid needs to be analyzed to determine whether it can meet the technical requirements.

[0079] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A highly efficient chemical deodorization device, characterized in that: include: An absorption liquid storage tank, wherein the air inlet of the absorption liquid storage tank is connected to a reaction tube, and the air outlet of the absorption liquid storage tank is connected to a demister; A liquid spray pipe, the lower end of which is connected to the reaction tube, and the upper end of which is connected to an external fan; A circulation mechanism, wherein the extraction end of the circulation mechanism is connected to the liquid outlet of the absorption liquid storage tank, and the discharge end of the circulation mechanism is connected to the liquid spray pipe; A plurality of screens are arranged in the reaction tube, and the plurality of screens are stacked in the reaction tube; The liquid spray pipe is provided with a liquid spray pipe external interface and a spare liquid spray pipe external interface, and the discharge end of the circulation mechanism is connected to the liquid spray pipe external interface; A nozzle is provided inside the liquid spraying pipe, and the nozzle is connected to the external interface of the liquid spraying pipe; The nozzle is arranged on the axis of the liquid spraying pipe, located above the screen, and the opening direction is toward the screen; The gas to be treated is deodorized by a plurality of the high-efficiency chemical deodorization devices.

2. A high-efficiency chemical deodorization device according to claim 1, characterized in that: Support rings are arranged between adjacent screens.

3. A high-efficiency chemical deodorization device according to claim 1, characterized in that: The absorption liquid storage tank is provided with a dosing port, an observation port, a storage tank emptying port and a storage tank overflow port.

4. A high-efficiency chemical deodorization device according to claim 1, characterized in that: The circulation mechanism is a circulation pump, and the mesh opening rate of the mesh is 92-96%.

5. The high-efficiency chemical deodorization device according to claim 1, characterized in that: The liquid discharge pipe of the demister is connected to the absorption liquid storage tank.

6. A high-efficiency chemical deodorization method, using the high-efficiency chemical deodorization device according to any one of claims 1 to 5, characterized in that: include: Setting the reagent in the absorption liquid storage tank; Starting the external fan to allow the treated gas to enter the absorption liquid storage tank through the liquid spray pipe and the reaction pipe; Start the circulation mechanism to make the reagent in the absorption liquid storage tank circulate between the liquid outlet and the liquid spray pipe.

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