CN-224221099-U - Direct thermal desorption tail gas deodorizing device

Abstract

The utility model relates to a direct thermal desorption tail gas deodorizing device, and belongs to the field of organic matter polluted soil repairing equipment. The device comprises a circulating water tank, a high-pressure spraying device, a pressure pump and a return pipeline, wherein the circulating water tank is used for storing natural plant extract with the concentration of 1-3 mill, the high-pressure spraying device is arranged at the top end of a spraying tower, deodorant is sprayed into tail gas through the pressure pump, odor removal is achieved through full contact with reverse airflow, and sprayed liquid returns to the circulating water tank through the return pipeline. The utility model has compact structure and convenient installation, adopts natural environment-friendly deodorant, has no secondary pollution, has the odor removal efficiency of more than 90 percent, and is suitable for the tail gas treatment of complex polluted soil restoration scenes.

Inventors

• ZHOU WENBIN
• WANG HUANYING
• FAN CHANGYUE
• GUO DU
• ZENG YUECHUN

Assignees

• 江苏大地益源环境修复有限公司

Dates

Publication Date

20260512

Application Date

20250214

Claims (4)

1. 1. A direct thermal desorption tail gas deodorizing device, characterized by comprising: The circulating water tank (A) is made of an anti-corrosion material and is used for storing and preparing biological deodorant; The spray tower (I) is connected to the rear end of the desulfurization and deacidification equipment and is used for the contact reaction of tail gas and deodorant; The high-pressure spraying device is fixedly arranged at the 50cm position at the top end of the spraying tower, the nozzle faces downwards, and the cross section of the tail gas flow is covered; The pressure pump (C) is connected with the circulating water tank and the high-pressure spraying device through a pipeline and is used for conveying deodorant; And the reflux pipeline (K) is arranged at the bottom of the spray tower and is communicated with the circulating water tank and used for recovering sprayed liquid.
2. 2. The device according to claim 1, wherein the high-pressure spraying device has a spraying pressure ranging from 0.5 to 1.2mpa and a spraying atomization particle size ranging from 50 to 200 μm.
3. 3. The device according to claim 1, characterized in that the volume of the circulating water tank (a) is adjusted according to the exhaust gas treatment capacity, and a concentration monitor is arranged in the tank for controlling the concentration of the deodorant in real time.
4. 4. The device according to claim 1, characterized in that a filter screen is arranged between the return line (K) and the bottom of the spray tower (I) for intercepting solid impurities.

Description

Direct thermal desorption tail gas deodorizing device Technical Field The utility model relates to the technical field of polluted soil restoration equipment, in particular to a direct thermal desorption tail gas deodorizing device which is used for odor treatment of tail gas in the thermal desorption restoration process of organic matter polluted soil. Background Because of the complex components in the polluted soil, a large amount of substances such as sulfur compounds, nitrogen compounds, halogens, derivatives, hydrocarbons, aromatic hydrocarbons, oxygen-containing organic substances and the like are generated in the direct thermal desorption treatment process, and the situation that the odor concentration exceeds the standard is often faced in the exhaust emission. For the waste gas generated on the repair site, the current main stream is treated by means of secondary combustion and desulfurization and deacidification processes, and the waste gas is discharged from an exhaust barrel after being treated. The direct thermal desorption process is used for treating the polluted soil with low pollution concentration and simple components, the odor removal rate in the waste gas is higher, but the odor in the tail gas is difficult to remove for the polluted soil with higher pollution concentration and complex components. Disclosure of utility model The utility model aims to provide a tail gas deodorizing device with simple structure, high efficiency and environmental protection, and solves the problems of low deodorizing efficiency and high secondary pollution risk in the prior art by optimizing a spray tower structure and a deodorant circulating system. The utility model adopts the following technical scheme to realize the purposes: A direct thermal desorption tail gas deodorizing device comprising: The circulating water tank is made of an anti-corrosion material and is used for storing and preparing biological deodorant; the spray tower is connected to the rear end of the desulfurization and deacidification equipment and is used for the contact reaction of tail gas and deodorant; The high-pressure spraying device is fixedly arranged at the 50cm position at the top end of the spraying tower, the nozzle faces downwards, and the cross section of the tail gas flow is covered; The pressure pump is connected with the circulating water tank and the high-pressure spraying device through a pipeline and is used for conveying deodorant; and the reflux pipeline is arranged at the bottom of the spray tower and communicated with the circulating water tank and is used for recovering sprayed liquid. Further, the spraying pressure range of the high-pressure spraying device is 0.5-1.2 MPa, and the spraying atomization particle size is 50-200 mu m. Further, the volume of the circulating water tank is adjusted according to the tail gas treatment capacity, and a concentration monitor is arranged in the circulating water tank and used for controlling the concentration of the deodorant in real time. Further, a filter screen is arranged between the reflux pipeline and the bottom of the spraying tower and is used for intercepting solid impurities. The utility model has the beneficial effects that the high-pressure spray biological deodorization process is added after the tail gas is subjected to bag dust removal, desulfurization and deacidification treatment aiming at the condition that the odor concentration in the tail gas of direct thermal desorption equipment exceeds the standard. Natural plant extract with the concentration of 1-3 per mill is prepared in a circulating water tank, and then pumped into a high-pressure spraying device at the upper end of a spraying tower to spray from top to bottom, fully contacts with reverse airflow, and fully performs physical and chemical reactions (polymerization, substitution, replacement, adsorption and the like) on biological deodorant and waste gas molecules, so that secondary pollution is avoided. Thereby achieving the aim of reducing the odor concentration. The deodorizing efficiency can reach more than 90 percent. The high-pressure spraying device provided by the utility model can be quickly installed and removed at the tail end of the desulfurizing tower, and is convenient to maintain and repair. The spraying device has low cost, does not occupy the ground and does not change the original equipment structural form. The used biological deodorant is extracted from natural plants, is easy to obtain in the market, is natural and environment-friendly, and is neutral, nontoxic and noncorrosive. Before the gas is discharged into the atmosphere, the biological deodorant sprayed by the high-pressure spraying device is fully subjected to physical and chemical reaction with waste gas molecules, the odor emission concentration meets the odor pollutant emission standard (GB 14554-1993), and no secondary pollution is generated. Drawings FIG. 1 is a schematic diagram of a direct thermal desorption