Lean oil heat intensified firing actuating apparatus of pulverized coal boiler

Abstract

The invention relates to a lean oil thermal reinforcement burning starting device for a pulverized coal boiler. A pulverized coal thermal reinforcement cracking pre-burning chamber is provided with a first wind pipe which is used for wind feeding. The left part of the first wind pipe is provided with a bent pipe and the right part thereof is provided with a straight pipe. A tube-shaped lean oil thermal reinforcement oil burner and an oil long fire feeding pipe which is connected with the tube-shaped lean oil thermal reinforcement oil burner extend to an entrance segment of a dense phase powder thermal reinforcement cracking burning pipe after passing through the first wind pipe. The left end of the dense phase powder thermal reinforcement cracking burning pipe is butt-jointed with the oil long fire feeding pipe, and the right end thereof is respectively connected with a thin phase powder thermal reinforcement cracking burning pipe and a thin phase powder wind-cooling pipe. The periphery of the dense phase powder thermal reinforcement cracking burning pipe is surrounded and connected by a secondary wind case for feeding air. The invention is characterized in that the existing oil burner is replaced by the pulverized coal burner which can be fired with extremely small quantity of oil during the firing, combustion-supporting and stable burning processes of the pulverized coal boiler, thereby greatly saving the fuel with an oil conservation rate of more than 95 percent, a pulverized coal burn-off rate of more than 90 percent and a flame temperature of 1800 DEG C. besides, the invention has the advantages of high burning efficiency, quick burning speed and strong wind resistance capability.

Description

technical field [0001] The invention relates to a starting combustion device of a pulverized coal boiler in a power station, a burner of a load peak-shaving unit, and a starting device for a pulverized coal boiler with lean oil thermally intensified combustion. Background technique [0002] At present, the general ignition method when starting a coal-fired boiler in a power station is: first use the ignition device to ignite the oil burner (commonly known as an oil gun, and the output of a single oil gun is 0.8-2t / h), and then heat up and increase the pressure. When the parameters meet the powder feeding requirements, start the pulverizing system and the pulverized coal burner to realize the load operation; when the boiler load is reduced to about 50%, it is necessary to feed oil and stabilize the combustion to ensure the normal operation of the boiler. A 300MW thermal power unit generally has five layers of pulverized coal burners. Under each layer of the bottom three layer...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems existing in the ignition of boilers in power plants at present, the present invention provides a fuel-lean heat-intensified combustion start-up device for pulverized coal boilers. Oil rate greater than 95%

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