A method and device for denitrification and heat recovery of industrial furnace flue gas

A heat recovery and industrial furnace technology, applied in chemical instruments and methods, separation methods, combustion methods, etc., can solve the problems of pressure pollutant content fluctuations, system paralysis, low valve synchronization, etc., to achieve strong adaptability to load changes, The effect of solving thiamine blockage

Active Publication Date: 2022-06-07
CHINA PETROLEUM & CHEM CORP +2
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  • Claims
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Problems solved by technology

[0010] In order to solve the technical problems existing in the prior art that additional reducing medium needs to be injected, there will be large pressure and pollutant content fluctuations during the reversing of the regenerator, and the low synchronization of the valves may lead to system paralysis, etc., the present invention provides A method and device for industrial furnace flue gas denitrification and heat recovery

Method used

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  • A method and device for denitrification and heat recovery of industrial furnace flue gas
  • A method and device for denitrification and heat recovery of industrial furnace flue gas
  • A method and device for denitrification and heat recovery of industrial furnace flue gas

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Embodiment 1

[0095] A hydrocarbon-containing tail gas incinerator, the flue gas temperature after incineration is 1250℃, the flue gas basically does not contain SOx, and the NOx content is 400mg / m 3 n. The nitrogen oxide content in the outlet flue gas is monitored online by the online monitoring instrument (CEMS) 93, and the air volume of the blower 95 is adjusted so that the hydrocarbons in the combustion furnace are not completely burned, and trace amounts of CO and H are generated. 2 . Regenerative reaction - in heat exchange module 1, CO and H 2 Reacts with NOx in the U-shaped regenerator 20, and the reaction regenerator 21 uses mullite as the base material, and the surface is impregnated with V 2 O 5 / MnO 3 / WO 3 Active metal compound components. The reversing valve 10 is switched every 3 minutes. After treatment, the temperature of the exhaust flue gas is reduced to 150°C, and the NOx in the flue gas is reduced to 80mg / m 3 n, which meets the emission index requirements, and is...

Embodiment 2

[0097] An incomplete regeneration reactor, the outlet flue gas temperature is 700 °C, and the SOx content is 800 mg / m 3 n, NOx content 200mg / m 3 n, CO content 1000mg / m 3 n. Since there is no combustion furnace, there is no process of online adjustment of the air volume, the flue gas directly enters the regenerative reaction-heat exchange assembly 1, CO reacts with NOx in the U-shaped regenerator 20, and the reaction regenerator 21 reacts with NOx. Based on honeycomb ceramic, impregnated with CeO 2 / La 2 O 3Active metal catalyst component. The reversing valve 10 is switched every 2 minutes, and the heat of the regenerator is used to heat the process gas with a fixed flow rate, which saves the steam consumption originally used for heating the process gas. Regenerative reaction - the flue gas temperature at the outlet of heat exchange component 1 drops to 100°C, the SOx content is slightly reduced, and the NOx content is reduced to 65mg / m 3 n, CO content reduced to 840mg / m...

Embodiment 3

[0099] A VOCs treatment facility uses RCO to treat VOCs. The temperature of the exhaust gas produced is 450°C and the SOx content is 30mg / m2 3 n, NOx content 120mg / m 3 n, CO content 250mg / m 3 n. The exhaust gas directly enters the regenerative reaction-heat exchange assembly 1, CO reacts with NOx in the U-shaped regenerator 20, and the reaction regenerator 21 is made of a steel plate base material, inlaid with Zn α / HKUST zinc-copper bimetallic organocatalyst. The reversing valve 10 is switched every 2 minutes. After treatment, the temperature of the exhaust flue gas is reduced to 120°C, and the NOx in the flue gas is reduced to 70mg / m 3 n, CO content 170mg / m 3 n Meet the emission target requirements. The heat of the regenerator is used to heat the air for RCO oxidation at a fixed flow rate, which saves the fuel consumption of the RCO device.

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Abstract

The invention discloses a method and a device for denitrification and heat recovery of industrial furnace flue gas. The method comprises that the high-temperature flue gas is converted into low-temperature flue gas after heat exchange and reaction in the flue gas channel formed by the U-shaped regenerator containing the catalyst, and the ambient air is heat-transformed in the air channel formed by the U-shaped regenerator containing the catalyst. High-temperature air, flue gas channel and air channel are switched through the reversing valve; the device mainly includes the heating furnace and its air distribution control system, U-shaped regenerator, reversing valve, air inlet and outlet modules, and flue gas inlet and outlet Module and reversing valve driving device; air inlet and outlet modules, reversing valve and flue gas inlet and outlet modules are located on the diameter of the reversing valve, and U-shaped regenerators are evenly distributed on both sides of the diameter of the reversing valve. The invention integrates denitrification and regenerative heat recovery functions, and can replace waste heat boilers and denitrification towers as a whole; it does not need to introduce reducing agents from the outside, which greatly reduces device investment, land occupation and operating costs.

Description

technical field [0001] The invention belongs to the technical field of industrial environmental protection, and in particular relates to a method and a device for denitrification and heat recovery of industrial furnace flue gas. Background technique [0002] In the flue gas of various reaction furnaces and heating furnaces in petrochemical, steel, non-ferrous metallurgy, thermal power generation and other industries, nitrogen oxides are generally contained in the flue gas, which needs to be denitrified before discharge. Industrial flue gas denitrification generally adopts SCR or SNCR method. [0003] The SCR method uses ammonia or urea as a reducing agent to reduce nitrogen oxides in flue gas to nitrogen under the action of a catalyst. At present, the commonly used medium-temperature SCR denitration temperature is 300-400 °C, and the SCR catalyst can only be installed between the high temperature and low temperature sections of the waste heat boiler, which not only destroys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/56F23L15/02F23J15/06F23J15/02
CPCB01D53/8631F23L15/02F23J15/06F23J15/02B01D2251/204B01D2251/202B01D2258/0283F23J2215/10Y02E20/34
Inventor 胡敏王刻文王德瑞杨利然牛春林王帆朱雷鸣
Owner CHINA PETROLEUM & CHEM CORP
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