The invention discloses a low-nitrogen pulverized coal combustor group for high-proportion mixed combustion of blast furnace gas and coke oven gas of small and medium-sized units, relates to a pulverized coal combustor group, and aims to solve the problem that more blast furnace gas cannot be mixed and burnt when fuel gas is mixed and burnt in a pulverized coal boiler. The coal combustor group consists of a 1# burnout air spraying nozzle, a 2# burnout air spraying nozzle, a tertiary air spraying nozzle, a secondary air spraying nozzle, a 1# pulverized coal combustor, a 1# coke oven gas combustor, a 2# pulverized coal combustor, a 2# coke oven gas combustor and a blast furnace gas combustor which are arranged in sequence from top to bottom, wherein the spraying nozzles face one side. The combustor group disclosed by the invention can realize high-proportion mixed combustion of the blast furnace gas, meanwhile, achieves low-nitrogen emission, and is convenient to install and transport. The combustor group is adaptive to the combustion of the pulverized coal boiler.

Low-nitrogen pulverized coal combustor group for high-proportion mixed combustion of blast furnace gas and coke oven gas of small and medium-sized units

PROBLEM TO BE SOLVED: To shorten the cooling time of a negative pressure circulation type pulverized coal-blowing facility, to expand the nitrogen purge are of the facility, and to add a leakage check function to the facility.SOLUTION: A negative pressure circulation type pulverized coal-blowing facility comprises a pulverizer 1, a gas heater 2, a dust collector 3, an exhaust gas circulation unit 4, a diluting air supply device 5, and further, a hot air delivery pipe 8, a pulverized coal/exhaust gas pipe 9, an exhaust gas discharge pipe 10, a first duct 11 for diffusing the exhaust gas into the atmosphere, and a connection pipe 13. In the facility, there is provided a nitrogen gas supply unit 6 capable of supplying a nitrogen gas halfway from a second pressure control valve 15 of the connection pipe 13 to a circulation flow control valve 14, and halfway from the valve 14 to a gas heater 2. Further, a bypass pipe 16 connecting the pipe 10 and the diffusion port side of a first pressure control valve 12 is provided, and a check valve 17 is also provided to the bypass pipe 16.

Iwakiri Takanobu

Papers

Negative pressure circulation type pulverized coal-blowing facility, and cooling, purge and leakage check methods