Nitrogen oxide gas two-stage absorption device

Abstract

The utility model provides a nitrogen oxide gas two-stage absorption device which is characterized in that the nitrogen oxide gas two-stage absorption device comprises a reaction tank, baffles are arranged in the reaction tank, and the baffles are welded on the side wall of the reaction tank and are sequentially and parallelly arranged up and down in a staggered manner; the reaction tank is of a square structure, a liquid inlet pipe, an air inlet pipe and a backflow water inlet pipe are arranged on the reaction tank wall on one side in the width direction, and a liquid outlet pipe and a backflow water outlet pipe are arranged on the reaction tank wall on the symmetry plane; a gas outlet pipe is arranged at the top of the reaction tank, and the gas outlet pipe and the backflow water inlet pipe are arranged in a diagonal manner; and a sprayer is arranged above the reaction tank. By adopting a liquid absorption method and a two-stage absorption method, the integrated device for removing the low-concentration nitrogen oxide gas is developed, and the device not only can effectively solve the problem of nitrogen oxide gas absorption efficiency, but also can save manpower and material resources.

Description

Technical Field

[0001] The utility model relates to a two-stage absorption device, more specifically, to a two-stage absorption device for nitrogen oxide gas. Background Art

[0002] As a pollutant, nitrogen oxides are harmful to human health, causing lung cancer, leukemia, respiratory diseases, and even organ failure. In addition, nitrogen oxides are important precursors of secondary pollution such as ozone, fine particles, and acid deposition. Nitrogen oxides have a serious polluting effect on the atmosphere, which can reduce visibility and cause acid rain, photochemical smog, and other phenomena. Nitrogen oxides, together with other sulfur compounds such as sulfur dioxide, are the main components of acid rain.

[0003] At present, the commonly used nitrogen oxide treatment processes include low-temperature plasma technology, which is a method based on gas discharge and uses the energy of high-energy electron beams to form plasma in the atmospheric environment to achieve the purpose of pollutant removal. However, this method is not effective for treating low-concentration nitrogen oxide gases, and the equipment occupies a large area. Catalytic combustion technology is a technology that uses the action of a catalyst to cause nitrogen-containing gases to undergo an oxidation reaction at a lower temperature, thereby achieving the purpose of purifying the gas. However, due to its high exhaust gas emissions, it has greater hazards. The utility model overcomes the shortcomings of the above technologies. By adopting a liquid absorption method and a two-stage absorption method, an integrated device for removing low-concentration nitrogen oxide gases has been developed. The device can not only effectively solve the problem of nitrogen oxide gas absorption efficiency, but also save manpower and material resources. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides a two-stage absorption device for nitrogen oxide gas, which adopts the following technical solutions:

[0005] A two-stage absorption device for nitrogen oxide gas, characterized in that it includes a reaction tank, wherein a baffle is arranged inside the reaction tank, and the baffle is welded to the side wall of the reaction tank and arranged in parallel and staggered in sequence up and down; the reaction tank structure is square, and a liquid inlet pipe, an air inlet pipe and a reflux water inlet pipe are arranged on the reaction tank wall on one side along the width direction, and a liquid outlet pipe and a reflux water outlet pipe are arranged on the reaction tank wall on its symmetrical surface; an air outlet pipe is arranged on the top of the reaction tank, and the air outlet pipe and the reflux water inlet pipe are arranged diagonally; a sprinkler is provided above the reaction tank.

[0006] Furthermore, the length dimension range of the reaction tank is 5000-6000 mm, the width dimension range is 2000-3000 mm, and the height dimension range is 4000-5000 mm.

[0007] Furthermore, the air inlet pipe is a right-angle structure, the horizontal part of the air inlet pipe is 2000-2500mm long, the length of the air inlet pipe into the reaction tank is 800-1000mm, the vertical part of the air inlet pipe is 800-900mm long, and the distance between the vertical part of the air inlet pipe and the wall of the reaction tank is 400-500mm.

[0008] Furthermore, the liquid outlet pipe is 50-100 mm higher than the water level in the reaction tank.

[0009] Compared with the prior art, the advantages of the present invention are:

[0010] The device realizes two-stage circulation absorption of nitrogen oxide gas, improves absorption efficiency, saves reagent consumption, and ensures that gas emissions meet standards stably.

[0011] The device adds a baffle plate to make the liquid present a baffled running state, thereby increasing the reaction rate of nitrogen oxides and reagents;

[0012] The spray valve and reflux valve of the device can control the reflux flow rate to meet different actual needs;

[0013] The device can realize automatic control or intelligent control, saving labor costs;

[0014] The device can save building area and has simple structure and operation;

[0015] Most of the materials of the device are simple materials, which is easy to manufacture and install, and has low material and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Among them, 1-air outlet pipe, 2-spray valve, 3-reflux valve, 4-reflux pump, 5-reflux water outlet pipe, 6-liquid outlet pipe, 7-sprayer, 8-liquid inlet pipe, 9-liquid inlet valve, 10-liquid inlet pump, 11-air inlet pipe, 12-reflux water inlet pipe, 13-reaction tank, 14-baffle, 15-reflux spray pipe. DETAILED DESCRIPTION

[0018] The utility model is further elaborated and illustrated below in conjunction with the accompanying drawings and specific implementation methods.

[0019] like Figure 1 As shown, the utility model provides a two-stage absorption device for nitrogen oxide gas, which includes an air outlet pipe 1, a spray valve 2, a reflux valve 3, a reflux pump 4, a reflux water outlet pipe 5, a liquid outlet pipe 6, a sprayer 7, a liquid inlet pipe 8, a liquid inlet valve 9, a liquid inlet pump 10, an air inlet pipe 11, a reflux water inlet pipe 12, a reaction tank 13, and a baffle 14.

[0020] The device comprises a reaction tank 13, wherein a baffle plate 14 is arranged inside the reaction tank 13, wherein the baffle plates 14 are welded on the side walls of the reaction tank 13 and are arranged in parallel and staggered in sequence up and down; the reaction tank 13 is square in structure, wherein a liquid inlet pipe 8, an air inlet pipe 11 and a reflux water inlet pipe 12 are arranged on the reaction tank wall on one side along the width direction, and a liquid outlet pipe 6 and a reflux water outlet pipe 5 are arranged on the reaction tank wall on the symmetric surface; an air outlet pipe 1 is arranged on the top of the reaction tank 13, wherein the air outlet pipe 1 and the reflux water inlet pipe 12 are arranged diagonally; and a sprayer 7 is arranged above the reaction tank 13.

[0021] The length of the reaction tank 13 is in the range of 5000-6000mm, the width is in the range of 2000-3000mm, and the height is in the range of 4000-5000mm; the liquid inlet pipe 8 is provided with a liquid inlet valve 9 and a liquid inlet pump 10; the reflux outlet pipe 5 is provided with a reflux pump 4, the reflux outlet pipe 5 is connected to the reflux spray pipe 15 upwardly and connected to the reflux inlet pipe 12 downwardly, the reflux spray pipe 15 is connected to the sprayer 7, the reflux spray pipe 15 is provided with a spray valve 2, the A reflux valve 3 is provided on the reflux water inlet pipe 12; the air inlet pipe 11 is a right-angle structure, the horizontal part of the air inlet pipe 11 is 2000-2500mm long, the air inlet pipe 11 penetrates into the reaction tank 13 by a length range of 800-1000mm, the vertical part of the air inlet pipe 11 is 800-900mm long, and the distance between the vertical part of the air inlet pipe 11 and the wall of the reaction tank is 400-500mm; the liquid outlet pipe 6 is 50-100mm higher than the water level in the reaction tank 13.

[0022] The working principle of the device is as follows: Liquid denitrification agent enters the reaction tank 13 through the liquid inlet pipe, and nitrogen oxide gas enters the reaction tank 13 through the air inlet pipe 11 to react with the liquid denitrification agent. In the reaction tank 13, the baffles 14 arranged alternately up and down allow the liquid denitrification agent and the nitrogen oxide gas to fully react. Under the action of the reflux pump 4, part of the reflux liquid after the reaction re-enters the reaction tank 13 through the reflux water inlet pipe 12 for reuse, and the other part passes through the reflux spray pipe 15 to the sprayer 7. Under the action of the sprayer 7, part of the nitrogen oxide gas that has not been completely reacted is absorbed by the spray liquid again. The treated gas is discharged from the device through the outlet pipe 1.

[0023] The reflux valve 3 is used to control the flow rate on the reflux water inlet pipe 12 , the spray valve 2 is used to control the flow rate on the reflux spray pipe 15 , and the liquid inlet valve 9 is used to control the flow rate on the liquid inlet pipe 8 .

[0024] The commonly used nitrogen oxide treatment process currently has the defects of large equipment footprint, high exhaust gas emissions, and greater hazards, and is not effective in treating low-concentration nitrogen oxide gases. The utility model overcomes the shortcomings of the above technologies and develops an integrated device for removing low-concentration nitrogen oxide gases by adopting liquid absorption method and two-stage absorption method. The device can not only effectively solve the problem of nitrogen oxide gas absorption efficiency, but also save manpower and material resources. Example

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0026] like Figure 1 As shown, this project adopted the above technical solution to trial-produce a two-stage absorption device for nitrogen oxide gas, and the treatment object is the nitrogen oxide gas generated after the denitrification treatment of electroplating wastewater.

[0027] The device comprises a reaction tank, wherein a baffle is arranged inside the reaction tank, and the baffle is welded on the side wall of the reaction tank and arranged in parallel and staggered up and down in sequence; the reaction tank structure is square, and a liquid inlet pipe, an air inlet pipe and a reflux water inlet pipe are arranged on the reaction tank wall on one side along the width direction, and a liquid outlet pipe and a reflux water outlet pipe are arranged on the reaction tank wall on its symmetric surface; an air outlet pipe is arranged on the top of the reaction tank, and the air outlet pipe and the reflux water inlet pipe are arranged diagonally; a sprinkler is arranged above the reaction tank.

[0028] The length dimension range of the reaction tank is 5000 mm, the width dimension range is 2000 mm, and the height dimension range is 4000 mm.

[0029] The air inlet pipe is a right-angle structure, the horizontal part of the air inlet pipe is 2000mm long, the length of the air inlet pipe extending into the reaction tank is 800mm, the vertical part of the air inlet pipe is 800mm long, and the distance between the vertical part of the air inlet pipe and the wall of the reaction tank is 400mm.

[0030] The liquid outlet pipe is 50 mm higher than the water level in the reaction tank.

[0031] Nitrogen oxide gas intake concentration 50~1000mg / m 3 After treatment by a two-stage absorption device, the time-weighted average allowable concentration of nitrogen oxides is < 5 mg / m³, and the short-term exposure allowable concentration is < 10 mg / m³, which meets the requirements of "Occupational Exposure Limits for Hazardous Factors in the Workplace Part 1: Chemical Hazardous Factors" (GBZ 2.1-2019) and reduces occupational harmful exposure.

[0032] The above-described embodiments are only used to illustrate one implementation method of the utility model, rather than to limit it. It should be pointed out that a person skilled in the art may modify the technical solutions described in the above-described embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by a person skilled in the art without making any creative work are within the protection scope of the utility model.

Claims

1. A two-stage absorption device for nitrogen oxide gas, characterized in that: It comprises a reaction tank, wherein a baffle is arranged inside the reaction tank, and the baffle is welded on the side wall of the reaction tank and arranged in parallel and staggered in sequence up and down; the reaction tank structure is square, and a liquid inlet pipe, an air inlet pipe and a reflux water inlet pipe are arranged on the reaction tank wall on one side along the width direction, and a liquid outlet pipe and a reflux water outlet pipe are arranged on the reaction tank wall on its symmetrical surface; an air outlet pipe is arranged on the top of the reaction tank, and the air outlet pipe and the reflux water inlet pipe are arranged diagonally; a sprinkler is arranged above the reaction tank.

2. A two-stage nitrogen oxide gas absorption device according to claim 1, characterized in that: The length dimension range of the reaction tank is 5000-6000mm, the width dimension range is 2000-3000mm, and the height dimension range is 4000-5000mm.

3. A two-stage nitrogen oxide gas absorption device according to claim 1, characterized in that: The liquid inlet pipe is provided with a liquid inlet valve and a liquid inlet pump; the reflux outlet pipe is provided with a reflux pump, the reflux outlet pipe is connected to the reflux spray pipe upward and connected to the reflux inlet pipe downward, the reflux spray pipe is connected to the sprinkler, the reflux spray pipe is provided with a spray valve, and the reflux inlet pipe is provided with a reflux valve.

4. A two-stage nitrogen oxide gas absorption device according to claim 1, characterized in that: The air inlet pipe is a right-angle structure, the horizontal part of the air inlet pipe is 2000-2500mm long, the length of the air inlet pipe extending into the reaction tank is 800-1000mm, the vertical part of the air inlet pipe is 800-900mm long, and the distance between the vertical part of the air inlet pipe and the wall of the reaction tank is 400-500mm.

5. A two-stage nitrogen oxide gas absorption device according to claim 1, characterized in that: The liquid outlet pipe is 50-100 mm higher than the water level in the reaction tank.

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