Design And Experiment Of Biomass Pyrolysis Gas Combustion Equipment

Biomass pyrolysis is a thermochemical conversion technology that can convert crop stalks or fuelwood into higher quality energy sources and it has become one of the world’s leading hotspots.High-temperature gas produced by pyrolysis of biomass is called biomass pyrolysis gas,throughdedusting,condensing,decoking and other processes,it can be get condensable gas and non-condensable gas.Condensable gas contains biomass tar,wood vinegar and water vapor,and non-condensable gas is also called biomass pyrolysis gas.Biomass gas can be used for combustion directly,and the tar of condensation can be used as an important chemical raw materials.Currently,the industrial chain of subsequent biomass pyrolysis has not yet opened,in the process of decoking,it can be lead to secondary pollution,a large number of tar can be buried,causing irreversible damage to the soil and water.Therefore,How to effectively solve it becomes a top priority.In this paper,a biomass pyrolysis gas combustion equipment is designed by using biomass pyrolysis gas direct combustion technology.This equipment does not carry out any treatment of biomass pyrolysis gas and is directly used for combustion.Its structure mainly includes burner,wind system,combustion chamber and heat exchanger.The catalytic cracking unit is designed in the combustion chamber,biomass pyrolysis gas undergoes catalytic cracking reaction when biomass pyrolysis gas is burning,and this paper explores the effect of catalyst on the pyrolysis of biomass during combustion.The test gas source comes from continuous biomass pyrolysis carbonization equipment.This paper taked peanut shells as raw materials,and the pyrolysis and carbonization were carried out under the conditions of carbonization temperature of 500℃ and pyrolysis time of 30 min.The results showed that the combustion efficiency reached the maximum when the excess air coefficient of the biomass pyrolysis gas was 1.16,compared with natural gas,the amount of air required for biomass pyrolysis gas combustion was higher.After adding the catalyst（dolomite）to the combustion process,the combustion efficiency was maximized when the excess air required for combustion was 1.18,compared with the non-added catalyst,the amount of air required for combustion was higher.NO_x emissions were highest when the excess air factor was the optimum.In the normal combustion state,the performance of the combustion equipment was better.The flame was light blue,performance of equipment combustion was stable,smoke emissions met national standards,combustion efficiency could reach about 98%,the combustion equipment met the design load.Under the action of the catalyst,the flue gas composition produced by the combustion had a slight change,the O₂ content in the flue gas increased from 2.1% to 2.4%,the CO₂ content increased from 26.2% to 27.2%.