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CN-122006441-A - System and method for treating flue gas by utilizing organic waste gas

CN122006441ACN 122006441 ACN122006441 ACN 122006441ACN-122006441-A

Abstract

The application belongs to the field of waste gas treatment and emission reduction, and discloses a system and a method for treating flue gas by utilizing organic waste gas, wherein the system comprises an organic waste gas discharge unit, a collection unit, an in-situ reduction unit and a discharge unit which are connected in sequence, the in-situ reduction unit comprises a reduction gas inlet, a flue gas inlet and a gas outlet, wherein the reduction gas inlet is connected with the outlet of the collecting unit, the flue gas inlet is used for inputting flue gas, and the gas outlet is connected with the inlet of the discharge unit. According to the application, the nitrogen oxides are reduced in situ by utilizing the self-produced organic waste gas of the refining enterprises, and the concentration of the nitrogen oxides in the flue gas is reduced by strengthening the in-situ reduction reaction after the nitrogen oxides are generated, so that the catalyst, ammonia and other reducing agents are not needed, the treatment cost is low, the subsequent nitrogen oxide treatment process is simplified, and the energy consumption investment, the carbon emission and the ammonia use and escape amount in the treatment process are reduced.

Inventors

  • CAO DONGDONG
  • XUE MING
  • LI XINGCHUN
  • CUI XIANGYU
  • WEI LIKUN

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团安全环保技术研究院有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (13)

  1. 1. A system for treating flue gas by utilizing organic waste gas is characterized by comprising an organic waste gas discharge unit (1), a collecting unit (2), an in-situ reduction unit (7) and a discharge unit (10) which are connected in sequence, The in-situ reduction unit (7) comprises a reduction gas inlet, a flue gas inlet and a gas outlet, wherein the reduction gas inlet is connected with the outlet of the collection unit (2), the flue gas inlet is used for inputting flue gas, and the gas outlet is connected with the inlet of the discharge unit (10).
  2. 2. A system for treating flue gas with organic waste gas according to claim 1, characterized in that a pressurizing unit (4) is arranged between the collecting unit (2) and the in-situ reduction unit (7).
  3. 3. A system for treating flue gas with organic waste gas according to claim 1, characterized in that a stabilizing and homogenizing unit (5) is arranged between the collecting unit (2) and the in-situ reduction unit (7), and the stabilizing and homogenizing unit (5) is filled with an adsorption material as a stabilizing and homogenizing bed layer, and the stabilizing and homogenizing bed layer is used for adsorbing or resolving VOCs according to the concentration of VOCs in the waste gas.
  4. 4. A system for treating flue gas with organic waste gas according to any one of claims 1-3, characterized in that a gas distribution mixing unit (6) is arranged between the collecting unit (2) and the in situ reduction unit (7) for regulating the flow and concentration of the organic waste gas.
  5. 5. A system for treating flue gas with organic waste gas according to claim 4, wherein the gas distribution mixing unit (6) is connected with a combustion air supply unit (11), the combustion air supply unit (11) being adapted to adjust the concentration of organic waste gas in the gas distribution mixing unit (6) and to assist combustion.
  6. 6. A system for treating flue gas with organic waste gas according to claim 1, wherein the in situ reduction unit (7) is connected to an air supply unit (12), the air supply unit (12) being adapted to supply combustion air to the combustion zone of the in situ reduction unit (7).
  7. 7. A system for treating flue gas with organic waste gas according to claim 1 or 6, wherein the in situ reduction unit (7) is connected with a gas supply unit (13), the gas supply unit (13) being adapted to supply gas to the combustion zone of the in situ reduction unit (7).
  8. 8. A system for treating flue gas with organic waste gas according to claim 1, characterized in that a cooling unit (8) is arranged between the in-situ reduction unit (7) and the discharge unit (10), the cooling unit (8) uses a heat exchange medium to realize heat transfer, reduce the temperature of the gas discharged from the in-situ reduction unit (7) and recover heat.
  9. 9. A system for treating flue gas with organic waste gas according to claim 1, characterized in that a sulphur removal unit (9) is arranged between the in-situ reduction unit (7) and the discharge unit (10), the sulphur removal unit (9) absorbing acidic substances in the gas with alkaline washing solvents.
  10. 10. A system for treating flue gas with organic waste gas according to claim 9, wherein the sulphur removal unit (9) is connected with an absorbent lean supply unit (14), the absorbent lean supply unit (14) being adapted to supply alkaline wash solvent lean to the sulphur removal unit (9).
  11. 11. A system for treating flue gas with organic waste gas according to claim 9 or 10, wherein the sulphur removal unit (9) is connected to an absorbent rich liquor storage unit (15), the absorbent rich liquor storage unit (15) being adapted to store the caustic wash solvent rich liquor discharged by the sulphur removal unit (9).
  12. 12. The system for treating flue gas using organic waste gas according to claim 1, wherein the flue gas comprises flue gas generated in the combustion process of oil refinery, chemical plant and environmental protection facilities.
  13. 13. A method for treating flue gas with organic waste gas, characterized in that the method is based on the system according to any one of claims 1-12 for treating nitrogen oxides in flue gas.

Description

System and method for treating flue gas by utilizing organic waste gas Technical Field The application belongs to the field of waste gas treatment and emission reduction, and particularly relates to a system and a method for treating smoke by using organic waste gas. Background Volatile Organic Compounds (VOCs) and nitrogen oxides (NOx) are main precursors for generating particulate matters, the influence on the quality of air is remarkable, refining enterprises are key VOCs and NOx emission sources, wherein the NOx mainly originates from device flue gas, and the VOCs mainly originates from an unorganized emission link. At present, the technology of NOx treatment mainly uses low-temperature ammonia selective reduction (SCR), and the technology mainly uses the selective reduction between ammonia and nitrogen oxides to reduce the nitrogen oxides into nitrogen and water, so as to realize the standard emission of the nitrogen oxides. The technology needs to spray ammonia components into the flue gas additionally, the treatment temperature is generally 250-450 ℃, and high-efficiency catalysts are needed, so that the technical requirements and the matched facilities and conditions are relatively harsh, and the investment cost is high. The VOCs treatment technology mainly comprises two treatment technologies of recovery and destruction, wherein the recovery technology comprises an adsorption method, an absorption method, a condensation method, a membrane separation method and the like, the destruction technology comprises biological treatment, photocatalytic oxidation, thermal oxidation, catalytic oxidation, low-temperature plasma and the like, and the recovery technology has larger differences of different technical principles and technological characteristics and has specific application scenes. Under the increasingly strict emission standard, in order to realize ultralow emission of the concentration of the VOCs component, the incineration technology is used as a terminal unit of various treatment processes, and the refined VOCs waste gas is led into a heating furnace and other devices for treatment. Therefore, it is necessary to provide a method for treating nitrogen oxides by using VOCs, by collecting and conveying the unorganized source of VOCs waste gas of a refining enterprise to a tail gas incinerator of a sulfur device, controlling the area and residence time of the VOCs waste gas entering the incinerator, strengthening the in-situ oxidation-reduction process between VOCs and NOx by using the in-furnace thermal environment, realizing the effects of reducing concentration of NOx, oxidizing VOCs and the like, reducing the concentration of NOx in the flue gas at the outlet of the incinerator, reducing the load of a subsequent denitration unit, and further reducing the energy consumption, the ammonia and other usage amounts. Disclosure of Invention In order to overcome the defects in the prior art, the method introduces the collected VOCs waste gas of the smelting enterprises into the sulfur device tail gas incinerator, and realizes VOCs degradation and nitrogen oxide conversion by utilizing the special environment in the incinerator, so that the synergistic treatment and standard emission of the VOCs and the NOx are achieved. A first object of the present application is to provide a system for treating flue gas using organic waste gas, comprising an organic waste gas discharge unit, a collection unit, an in situ reduction unit and a discharge unit, which are sequentially connected. The in-situ reduction unit comprises a reduction gas inlet, a flue gas inlet and a gas outlet, wherein the reduction gas inlet is connected with the outlet of the collecting unit, the flue gas inlet is used for inputting flue gas, and the gas outlet is connected with the inlet of the discharge unit. Further, a pressurizing unit is arranged between the collecting unit and the in-situ reduction unit and is used for pressurizing and treating the organic waste gas, so that the static pressure energy and the kinetic energy of the organic waste gas are improved. Further, a stable homogenizing unit is arranged between the collecting unit and the in-situ reduction unit, an adsorption material is filled in the stable homogenizing unit to serve as a stable homogenizing bed, and the stable homogenizing bed is used for adsorbing or analyzing VOCs according to the concentration of the VOCs in the waste gas. Further, a gas distribution mixing unit is arranged between the collecting unit and the in-situ reduction unit and is used for adjusting the flow and the concentration of the organic waste gas. Further, the gas distribution mixing unit is connected with a combustion-supporting air supply unit, and the combustion-supporting air supply unit is used for adjusting the concentration of the organic waste gas in the gas distribution mixing unit and supporting combustion. Further, the in-situ reduction unit is connected with an air supply unit for