For the gas-steam combined cycle unit which uses urea to produce ammonia for denitrification

the temperature conditions required for urea pyrolysis restrict the characteristics of rapid start-up and peak regulation of gas turbine. This paper introduces the practical application characteristics of urea direct injection system in gassteam combined cycle unit for the first time. It briefly describes the matters that should be paid attention in the application of this technology. Firstly

through reasonable spray gun layout and special spray gun structure

the atomization effect of urea and the uniformity of distribution in the furnace are guaranteed. Then

the optimization adjustment is carried out through numerical simulation to make the direct injection of urea meet the technical requirements of denitration efficiency greater than 85%. From the point of view of system configuration

operation and maintenance

compared with the conventional urea pyrolysis furnace system

the urea direct injection system has the advantages of simple system

small floor area

low project cost

high operation reliability and good economic benefit

which has good development prospect.