Research On High Fuel Nitrogen Waste Liquid And Gas Incineration System And Air Staged Combustion NO_x Control Technology

Incineration is a process of decomposition and harmlessness by burning waste.High temperature heat treatment technology is used for incineration.It is especially suitable for treating waste liquid and gas with many organic components and high calorific value.However,the high temperature incineration of waste liquid and gas will produce pollutant NOx,especially the nitrogen element in the waste liquid and waste gas,which will produce fuel-type NOx,which is more difficult to control than thermal-type NOx.For nitrogen-containing waste liquid and gas incineration,fuel-type NOx is the main source of NOx production in the incineration system.Traditional incineration technology can not effectively reduce the fuel-type NOx and meet increasingly stringent emission standards.It is of great practical significance to study the incineration technology of high fuel nitrogen waste liquid and gas and the control technology of NOx in air staged combustion.The main research contents and conclusions of this paper are as follows:1)Based on the formation mechanism and main influencing factors of fuel-type NOx,the design principles and recommended values of main design parameters of air staged combustion scheme are put forward.The excess air coefficient in reduction section should be 0.6?0.9,the operation temperature in reduction section should be 900? 1,500?,and the residence time in reduction section should be 0.5s?1.0s.The optimum operating temperature is 900??1,150?,the oxygen content in flue gas is 2%?5%,and the residence time in oxidation stage is 1.0s?1.5s.2)In view of the material characteristics of amine high fuel nitrogen waste liquid,the design scheme of incineration system and the main design parameters of incineration air staged combustion scheme are determined.The excess air coefficient in the reduction section is 0.8,the operating temperature is 1,350?,and the residence time is 0.8s.The operating temperature in the reduction section is adjusted by industrial water and the operating temperature in the oxidation section is 1,050?.The oxygen content in flue gas is 9.0%and the residence time is 1.2s.3)In view of the material characteristics of pyridine high fuel nitrogen waste liquid and gas,the main design parameters of the incineration system design scheme and the incineration air staged combustion scheme are determined.The excess air coefficient in the reduction section is 0.8,the operating temperature is 1,500?,and the residence time is 0.7s.The operating temperature in the reduction section is adjusted by the cooling steam and the operating temperature in the oxidation section is 1,050?.The oxygen content of flue gas is 8.5%and the residence time is 1.2s.4)In view of the material characteristics of nitro high fuel nitrogen wastewater and the shortcomings of the existing incineration process,the design scheme of the incineration system and the main design parameters of the incineration air staged combustion scheme are determined.The excess air coefficient of reduction section is 0.8,the operating temperature is 1,000?,the residence time is 0.6s,the operating temperature of oxidation section is 900?,the oxygen content of flue gas is 3.5%,and the residence time is 1.2s.5)According to the design scheme proposed in this paper,the design and construction of the actual project are completed,and the actual project operation data are obtained.The data analysis shows that the air staged combustion technology has a NOx concentration of less than 300 mg/Nm3,which is more than 80%lower than that of conventional incineration technology.It has achieved good results in controlling NOx emissions from high fuel nitrogen waste liquid and gas incineration and it is a kind of treatment technology with broad prospects.