Combustion system and method for low calorific value nitrogen-containing gas

Abstract

The invention discloses a low calorific value nitrogen-containing gas combustion system and method. The system is divided into a main combustion chamber for low calorific value nitrogen-containing gas combustion and a pre-combustion chamber for providing heat and oxygen for the initial ignition and stable combustion of low calorific value nitrogen-containing gas. Area. When working, a small amount of high calorific value gas is burned in the pre-combustion zone under the condition of excess air coefficient of 1.5 to 1.7 to produce high-temperature flue gas containing a large amount of oxygen. The high-temperature flue gas enters the main combustion chamber to provide heat and oxygen for the initial ignition of the low calorific value nitrogen-containing gas, forming a stable initial combustion area, and then heats and ignites the low calorific value gas and air injected later to form the main combustion area. Control the amount of air injected into the main combustion area to ensure that the combustion is in a reducing atmosphere and inhibit the transfer of fuel nitrogen to NO in the gas x conversion and reduction of previously generated NO x . The invention overcomes the low heat value nitrogen-containing gas in the ignition stable combustion and NO x Difficulties in reducing emissions, improving the combustion efficiency of low calorific value nitrogen-containing gas, and the NO in flue gas x The emission concentration is lower than 30mg / Nm 3 .

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering, and in particular relates to a combustion system and method for a low calorific value nitrogen-containing gas. Background technique [0002] In the process of industrial production, a large amount of low calorific value nitrogen-containing (fuel nitrogen) gas will be produced, such as coal gas produced in the steelmaking process, low calorific value tail gas in the chemical process, smelting tail gas in the petroleum industry, low-concentration gas in coal mines and when developing coalbed methane. There will be a large amount of low-calorific value nitrogen-containing gases of lower quality that have not been utilized. In addition, a large amount of nitrogen-containing gas with low calorific value is also produced in nature and daily life, such as biomass gasification gas, biogas produced by breeding and brewing industries, landfill gas, etc. The direct discharge of...

AI Technical Summary

Problems solved by technology

The invention can overcome the difficulty of ignition and stable combustion of low calorific value nitrogen-containing gas and the problem of NO x To solve the problem of high emissions, realize the efficient and clean utilization of nitrogen-containing gas with low calorific value

Images