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Method for flue gas denitrification by organic waste gas

A technology of organic waste gas and flue gas, which is applied in the field of flue gas denitrification, can solve the problems of difficult industrialization and high energy consumption, and achieve the effects of high operational safety, saving investment, saving land occupation and device construction costs

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses corona discharge to achieve flue gas denitrification, which has high energy consumption and is difficult to industrialize

Method used

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  • Method for flue gas denitrification by organic waste gas

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Embodiment approach

[0027] Such as figure 1As shown, the method for flue gas denitrification using organic waste gas in the present invention generally includes an organic waste gas desulfurization reactor 2 , a heater 4 , a waste gas purification reactor 5 and an energy recovery unit 6 . According to the nature of the organic waste gas, the organic waste gas can be pre-desulfurized by using lye, alcohol amine solution or desulfurizer, and then the organic waste gas is introduced into the flue gas, and an appropriate amount of oxygen-containing gas is introduced to make organic hydrocarbons, NOx and oxygen The concentration meets the requirements of the reaction. After the temperature is raised to 100-500°C by the heater, the mixed exhaust gas enters the exhaust gas purification reactor. Here, in the presence of a denitrification catalyst, the NOx in the exhaust gas and the organic matter undergo a redox reaction, and the NOx is converted into N 2 , the organic matter is oxidized to CO 2 and H...

Embodiment 1

[0031] The NOx concentration in boiler flue gas of an enterprise is 500mg / Nm 3 , the gasoline loading tail gas is treated by the oil gas recovery device, the non-methane total hydrocarbons in the tail gas (expressed as CH 4 meter) concentration 10000mg / Nm 3 . After mixing: total non-methane hydrocarbons in exhaust gas (as CH 4 ) to NOx molar ratio of 3:1; oxygen to total hydrocarbon molar ratio of 1.5:1.

[0032] Operating conditions: the mixed gas is heated by an electric heater, the heating temperature is 270°C, and the operating space velocity is 3000h -1 , in the presence of a denitrification catalyst for redox reactions. The catalyst support is Al 2 o 3 , the active components are Pt and Pd, and the loadings are 1.5% and 1.0%, respectively.

[0033] After measurement, the NOx concentration in the purified flue gas is 50mg / Nm 3 , non-methane total hydrocarbons (in CH 4 meter) concentration 100mg / Nm 3 .

Embodiment 2

[0035] The concentration of NOx in boiler flue gas of a factory is 500mg / Nm 3 , non-methane total hydrocarbons (in CH 4 meter) concentration 6000mg / Nm 3 , H 2 S concentration 50mg / Nm 3 .

[0036] Operation steps and operating conditions: (1) First, use activated carbon loaded with ZnO desulfurization agent to desulfurize the organic waste gas; (2) Introduce the organic waste gas and air into the flue gas containing NOx; after mixing, the total non-methane hydrocarbons in the waste gas (in CH 4 ) to NOx molar ratio is 5:1; oxygen to total hydrocarbon molar ratio is 2:1; (3) Heating the mixed gas with an electric heater, the heating temperature is 310°C, and the operating space velocity is 3000h -1 . The active components of the catalyst used were Co, manganese oxide and Pt, the loadings were 5.0%, 3.5% and 1.0%, respectively, and the carrier was Al 2 o 3 .

[0037] After measurement, the NOx in the purified flue gas is 150mg / Nm 3 , non-methane total hydrocarbons (in C...

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Abstract

The invention discloses a method for flue gas denitrification by an organic waste gas. The method comprises: introducing an organic waste gas and an oxygen-containing gas into an NOx flue gas to obtain a mixed waste gas, heating the mixed waste gas to a temperature of 100-500DEG C, then making the mixed waste gas enter a waste gas purification reactor, under the action of a flue gas denitrification catalyst, reducing the NOx in the flue gas into N2 by organic hydrocarbon in the waste gas, and simultaneously oxidizing hydrocarbon into CO2 and H2O, subjecting the denitrified flue gas to energy recovery and discharging it completely. The method disclosed in the invention utilizes the organic waste gas as a reducing agent for catalytic reduction of the NOx in the flue gas, and integrates flue gas denitrification and odor pollution control. With the characteristics of safe operation and less one-time investment, the method is especially suitable for enterprises having organic waste gas sources and NOx-containing flue gas at the same time.

Description

technical field [0001] The invention relates to a flue gas denitrification method, in particular to a method for utilizing organic waste gas to carry out flue gas denitrification, and belongs to the technical field of environmental protection. Background technique [0002] Although my country's total sulfur dioxide emissions in 2010 decreased by 14.29% compared with 2005, the goal of the "Eleventh Five-Year Plan" was completed, making SO 2 The harm caused by acid rain has been curbed to a certain extent. However, the emission of NOx (nitrogen oxides) is partially offset by the emission reduction of SO 2 and the impact of acid rain. At present, the flue gas denitrification technologies used in industry are mainly selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) technologies. SCR means that under the action of a catalyst, the NH 3 As a reducing agent, it selectively reacts with NOx in the flue gas and generates non-toxic and pollution-free N...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/76B01D53/56
Inventor 王明星彭德强齐慧敏王海波刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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