Coal-saving method for layer-burning boiler

Abstract

The invention provides a coal-saving method for a layer-burning boiler, and relates to improvements and innovations of a burning technological method related to heat transfer modes of layer-burning coal-burning boilers for heat power plants, industries, hot water and the like. The method comprises the steps of contact heat conduction achieved through semi-coked red coke charcoal fire covered with a coal bed, suppression of naked fire flame generation through the coal bed which covers a fire bed and is subjected to watering fermentation, disconnection and connection automatic circulating type negative pressure ventilation and oxygen blowing burning supporting and natural circulating of cold and hot air currents of boiler water. Due to the fact that the fire bed is evenly covered with particle coal with corresponding thicknesses of the coal bed which can achieve ventilation and suppress generation of naked fire flames, the semi-coked red coke charcoal fire and a furnace hearth space are in a blocked and isolated state; meanwhile, the mode of disconnection and connection automatic circulating type induced draft fan negative pressure ventilation and oxygen blowing burning supporting is adopted, the velocity of circulation of semi-coked red coke charcoal fire burning gas is buffered, and meanwhile the semi-coked red coke charcoal fire is catalyzed to fully release high-temperature heat and transfers the heat to the boiler water in a contact heat conduction mode. All processes are operated synchronously and mutually superimposed and jointly act, and naked fire flame burning gas heat transfer is discarded; on the basis of fully improving the heat efficiency, the coal burning time is prolonged, and the coal consumption rate is decreased.

Description

technical field [0001] The present invention relates to high-end equipment manufacturing, low-carbon technology, resource saving, energy saving and environmental protection, new energy, etc., which contribute to the green development of relevant geothermal power plants, industries, hot water and other fire technology methods related to the heat transfer mode of bed-fired coal-fired boilers. Improve innovation. Background technique [0002] At present, the heat transfer method in the furnace of the layer-fired coal-fired boiler is: heat exchange with open flame flame gas, which converts heat energy into radiant energy through flame transfer, not semi-coking charcoal fire contact heat conduction, that is, [open flame flame gas]>( Flame and gas transmission) > [outer cooling water wall on the middle and upper side of the furnace wall] > (heat conduction) > [inner cooling water wall on the middle and upper side of the furnace wall] > (convective heat transfer) >...

AI Technical Summary

Problems solved by technology

[0003] Coal burns fast, and the amount of coal input is large; the gas flow speed is fast, and the contact time with the heating surface is short, and a large amount of heat is quickly discharged before being transferred to the water wall; the increased loss of coal dust fly away causes coal waste, and it is easy to disturb the fire layer. Reduce the furnace temperature; affected by the heat transfer distance, the heat loss is large, the heat transfer intensity is weak, the temperature transferred to the heating surface is relatively low, and more than 95% of the heat released by the coal is exhausted by the furnace space

[0004] Affected by the natural convection cycle phenomenon of hot air rising and cold air falling, the heating surface of the open flame flame gas radiation heat exchange is only the hot pot water, steam-water mixture and overheating in the high-temperature zone above 90°C in the water-cooled wall on the middle and upper sides of the furnace wall. Steam, but the cold pot water in the low-temperature zone below 40°C below the water wall of the furnace wall does not get heat transfer, which greatly limits the heat transfer coefficient, steam rise and boiler thermal efficiency improvement