Device for removing ammonia gas

Abstract

The utility model relates to the technical field of environmental protection equipment, and particularly provides a device for removing gaseous ammonia, which comprises a carbon dioxide storage tank, a venturi ejector, a spray pipe and a stainless steel wire mesh. Carbon dioxide gas in the carbon dioxide storage tank enters the venturi ejector, process condensate enters the venturi ejector to form a gas-liquid mixture with carbon dioxide, the gas-liquid mixture enters the spraying pipe to be sprayed out, and a water mist film containing the carbon dioxide gas is formed on the stainless steel wire net. And the water mist film is in contact reaction with free ammonia-containing air from chemical equipment on the stainless steel wire mesh. The stainless steel wire mesh is arranged at the top of the chemical equipment for generating ammonia gas, so that free ammonia in emissions is efficiently removed, the content of the free ammonia in the emissions is reduced, the health of people is protected, and the environment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection equipment, in particular to an environmental protection device for removing free ammonia. Background Art

[0002] Ammonia is a compound of nitrogen and hydrogen with the chemical formula NH 3 Ammonia is a colorless gas with a strong pungent odor composed of ammonia molecules. Ammonia molecules can combine with water to form ammonia water (NH3·H2O), or they can combine with other substances to form salts, such as ammonium chloride (NH4Cl). Free ammonia refers to ammonia molecules that are not combined with other substances. Ammonia gas and free ammonia can burn the skin, eyes, and mucous membranes of respiratory organs, affecting human health.

[0003] Ammonia or free ammonia is inevitably produced during the production of urea or certain chemical products. At present, there is no good method for manufacturers to remove free ammonia from chemical equipment. Many companies use water washing methods, but the effect is not ideal. Some companies directly introduce carbon dioxide at the top of the chemical equipment, which has a certain effect but does not achieve full contact between the gas and the ammonia removal effect is not ideal. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects in the prior art and provide a device for removing gaseous ammonia, which is used to efficiently remove free ammonia in chemical production emissions, effectively reduce the free ammonia content in the emissions, protect human health and protect the environment.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A device for removing gaseous ammonia, comprising: a carbon dioxide storage tank, a venturi ejector, a spray pipe, and a stainless steel wire mesh;

[0007] The carbon dioxide storage tank is connected to the Venturi injector, the Venturi injector is connected to the spray pipe, the spray pipe is arranged on the stainless steel wire mesh, and the stainless steel wire mesh is arranged on the top of the chemical equipment;

[0008] The carbon dioxide storage tank is provided with a solenoid valve and a carbon dioxide pressure regulating valve, the carbon dioxide storage tank is connected to the carbon dioxide gas through the carbon dioxide pressure regulating valve, and the carbon dioxide gas in the carbon dioxide storage tank is connected to the Venturi injector through the solenoid valve;

[0009] The venturi ejector is provided with a process condensate regulating valve, and the venturi ejector is connected to the process condensate through the process condensate regulating valve, so that the process condensate is mixed with carbon dioxide to form a gas-liquid mixture;

[0010] The spray pipe is used to spray the gas-liquid mixture toward the stainless steel wire mesh to form a water mist film or water curtain containing carbon dioxide gas on the stainless steel wire mesh.

[0011] As a further technical solution, the spray pipe is a ring pipe, and there are spray holes on the spray pipe.

[0012] As a further technical solution, the device for removing gaseous ammonia further comprises: a water storage layer, arranged at the lower part of the stainless steel wire mesh;

[0013] A stainless steel wire mesh support is provided at the upper end of the water-containing layer, and the stainless steel wire mesh support is connected to the lower end of the stainless steel wire mesh to support the stainless steel wire mesh.

[0014] As a further technical solution, the upper end of the stainless steel wire mesh is fixedly connected to the top vertical wall of the chemical equipment, and the angle between the upper end of the stainless steel wire mesh and the top vertical wall of the chemical equipment is 30-60°.

[0015] The beneficial effects of the utility model are:

[0016] The utility model is provided with a venturi ejector to form a gas-liquid mixture with the process condensate and carbon dioxide, and then eject it into the spray pipe, so that the carbon dioxide gas and the ammonia gas are in contact and always kept in a water environment for contact reaction, which increases the contact time between the carbon dioxide and the ammonia gas and ensures the full reaction of the ammonia;

[0017] The utility model is provided with a stainless steel wire mesh, and the spray pipe sprays the gas-liquid mixture on the stainless steel wire mesh to form a water mist film containing carbon dioxide gas. The existence of the stainless steel wire mesh provides a close contact place for carbon dioxide and ammonia, which increases the contact surface and the wet environment and provides sufficient time;

[0018] The utility model stainless steel wire mesh is arranged on the top of chemical equipment to efficiently remove free ammonia in the discharge, reduce the free ammonia content in the discharge, protect human health and protect the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall structure of an embodiment of the utility model.

[0020] Figure numerals: 1 carbon dioxide storage tank, 2 venturi ejector, 3 solenoid valve, 4 carbon dioxide pressure regulating valve, 5 process condensate regulating valve, 6 spray pipe, 7 stainless steel wire mesh, 8 stainless steel wire mesh support, 9 stainless steel wire mesh vertical angle. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figure 1 As shown, an embodiment of the utility model is a device for removing gaseous ammonia, which includes: a carbon dioxide storage tank 1, a venturi injector 2, a spray pipe 6, and a stainless steel wire mesh 7.

[0023] The carbon dioxide storage tank 1 is connected to the venturi injector 2, and the venturi injector 2 is connected to the spray pipe 6. The spray pipe 6 is arranged on the stainless steel wire mesh 7, and the stainless steel wire mesh 7 is arranged on the top of the chemical equipment; the carbon dioxide storage tank 1 is provided with a solenoid valve 3 and a carbon dioxide pressure regulating valve 4, the carbon dioxide storage tank 1 is connected to the carbon dioxide gas through the carbon dioxide pressure regulating valve 4, and the carbon dioxide gas in the carbon dioxide storage tank 1 is connected to the venturi injector 2 through the solenoid valve 3; the venturi injector 2 is provided with a process condensate regulating valve 5, and the venturi injector 2 is connected to the process condensate through the process condensate regulating valve 5, so that the process condensate is mixed with carbon dioxide to form a gas-liquid mixture; the gas-liquid mixture enters the spray pipe 6, and the spray pipe 6 is used to spray the gas-liquid mixture to the stainless steel wire mesh 7 to form a water mist film or water curtain containing carbon dioxide gas on the stainless steel wire mesh 7.

[0024] The utility model sets a stainless steel wire mesh on the top of the chemical equipment, forms a water mist film on the stainless steel wire mesh, and contains carbon dioxide gas in the water mist film. The wet carbon dioxide gas and the air containing free ammonia from the chemical equipment contact and react on the stainless steel wire mesh, thereby having the effect of removing ammonia. The existence of the stainless steel wire mesh provides a close contact place for carbon dioxide and ammonia, and the contact between carbon dioxide gas and gaseous ammonia is always maintained in an environment with water, that is, the contact surface and the wet environment are increased, and sufficient time is provided, ensuring the full reaction of ammonia. Therefore, it is guaranteed to further improve the efficiency of ammonia removal.

[0025] There may be two, four or more carbon dioxide storage tanks 1; there may be two, four or more venturi ejectors 2; there may be two, four or more solenoid valves 3.

[0026] The number of the spray pipes 6 can be two, three or more. The spray pipe 6 is a ring pipe with spray holes. The air velocity of the spray holes is preferably about 1 m / s. The air velocity must be controlled to ensure that the carbon dioxide gas moves downward along the mesh surface of the stainless steel wire mesh 7 with water mist droplets, forming a water mist film or water curtain of water + carbon dioxide on the mesh surface. The spray pipes 6 can be arranged on the stainless steel wire mesh 7 in layers.

[0027] The stainless steel wire mesh 7 is provided with a fixing device to be fixed on the top of a chemical equipment producing ammonia, for example, it is used in a urea production equipment and fixed on the top of a urea granulation tower.

[0028] The flow area of ​​the stainless steel wire mesh 7 can meet the maximum ventilation volume in the chemical equipment. The stainless steel wire mesh 7 adopts a woven mesh, and the mesh holes can be square holes or long strip holes.

[0029] The process condensate may be a process condensate containing dissolved carbon dioxide gas.

[0030] The device for removing gaseous ammonia in the embodiment of the utility model further comprises: a water holding layer, which is arranged at the lower part of the stainless steel wire mesh 7 to carry the water sprayed from the spray pipe 6 and the water flowing down from the stainless steel wire mesh 7 .

[0031] A stainless steel wire mesh support 8 is provided at the upper end of the water storage layer, and the stainless steel wire mesh support 8 is connected to the lower end of the stainless steel wire mesh 7 to support the stainless steel wire mesh 7.

[0032] The upper end of the stainless steel wire mesh 7 is fixedly connected to the vertical wall at the top of the chemical equipment. The angle between the upper end of the stainless steel wire mesh 7 and the vertical wall at the top of the chemical equipment is the vertical angle 9 of the stainless steel wire mesh. The vertical angle 9 of the stainless steel wire mesh is preferably 30-60°. The vertical angle 9 of the stainless steel wire mesh is used to ensure that the water sprayed from the upper spray pipe 6 in the parking state will not flow into the interior of the chemical equipment by gravity.

[0033] The operation mode of the utility model is as follows:

[0034] The utility model is arranged on the top of the chemical equipment, and the carbon dioxide gas of about 1.0MPaA from the outside is pressurized into the carbon dioxide storage tank 1 through the carbon dioxide pressure regulating valve 4, and the pressure of the carbon dioxide storage tank 1 is controlled to be between 0.3-0.5MPaA. The gas in the carbon dioxide storage tank 1 enters the venturi ejector 2 through the solenoid valve 3, and the process condensate enters the venturi ejector 2 through the process condensate regulating valve 5, forms a gas-liquid mixture with carbon dioxide and enters the spray pipe 6, and is sprayed out through the small holes on the pipeline. The process condensate forms a water mist film on the stainless steel wire mesh 7, and the water mist film contains carbon dioxide gas. The moist carbon dioxide gas contacts and reacts with the air containing free ammonia from the chemical equipment on the stainless steel wire mesh 7, and has the effect of efficiently removing ammonia.

[0035] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A device for removing gaseous ammonia, characterized in that: include: Carbon dioxide storage tank, Venturi ejector, spray pipe, stainless steel wire mesh; The carbon dioxide storage tank is connected to the Venturi injector, the Venturi injector is connected to the spray pipe, the spray pipe is arranged on the stainless steel wire mesh, and the stainless steel wire mesh is arranged on the top of the chemical equipment; The carbon dioxide storage tank is provided with a solenoid valve and a carbon dioxide pressure regulating valve, the carbon dioxide storage tank is connected to the carbon dioxide gas through the carbon dioxide pressure regulating valve, and the carbon dioxide gas in the carbon dioxide storage tank is connected to the Venturi injector through the solenoid valve; The venturi ejector is provided with a process condensate regulating valve, and the venturi ejector is connected to the process condensate through the process condensate regulating valve, so that the process condensate is mixed with carbon dioxide to form a gas-liquid mixture; The spray pipe is used to spray the gas-liquid mixture toward the stainless steel wire mesh to form a water mist film or water curtain containing carbon dioxide gas on the stainless steel wire mesh.

2. The device for removing gaseous ammonia according to claim 1, characterized in that: The spray pipe is a ring pipe and has spray holes.

3. A device for removing gaseous ammonia according to claim 1 or 2, characterized in that: Also includes: A water-holding layer is arranged at the lower part of the stainless steel wire mesh; A stainless steel wire mesh support is provided at the upper end of the water-containing layer, and the stainless steel wire mesh support is connected to the lower end of the stainless steel wire mesh to support the stainless steel wire mesh.

4. The device for removing gaseous ammonia according to claim 3, characterized in that: The upper end of the stainless steel wire mesh is fixedly connected to the vertical wall at the top of the chemical equipment, and the angle between the upper end of the stainless steel wire mesh and the vertical wall at the top of the chemical equipment is 30-60°.

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