Device and method for expanding types of coal suitable for small and medium-sized industrial pulverized coal boilers

Abstract

The invention discloses a combustion apparatus and a combustion method, and particularly discloses a device and a method for expanding types of coal suitable for small and medium-sized industrial pulverized coal boilers. The device comprises a cyclone burner; a central delivery pipe, a central air duct, a primary air powder duct and a secondary air pipe are arranged at a nozzle of the cyclone burner sequentially from inside to outside, wherein the secondary air pipe comprises an internal secondary air duct and an external secondary air duct, and the internal secondary air duct is arranged at the inner side of the external secondary air duct; an outer ring nozzle is arranged in the external secondary air duct; an outlet end of the central delivery pipe is provided with a double-layer two-way gas nozzle; the gas nozzle comprises a forward nozzle and an outward nozzle, wherein the forward nozzle is arranged at the inner layer, is consistent with the direction of the central axis and can inject forwards; the outward nozzle is arranged at the outer layer, forms an angle of 45-60 degrees together with the central axis, and can inject in a way of a ring shape. The device and the method solve the problems that the types of coal of the small and medium-sized industrial pulverized coal boilers are poor in adaptive capacity and overhigh in NOx content. The device and the method realize the combined combustion of pulverized coal and liquefied petroleum gas in a vortex state.

Description

technical field [0001] The invention relates to a combustion device and method, in particular to a device and method for expanding the applicable coal types of small and medium-sized industrial pulverized coal boilers. Background technique [0002] There are about 580,000 industrial boilers in my country, and the number is increasing at a rate of nearly 7,000 per year. The annual coal consumption is about 600 million tons, and the total energy consumption and pollution emissions rank second in the country. Among the coal-fired industrial boilers in my country, the small and medium-sized ones below 20 tons account for the majority. Small and medium-sized industrial pulverized coal boilers can only burn high-quality bituminous coal and lignite with low ash, high volatile content and high calorific value due to their small combustion space and high water cooling, which seriously restricts the popularization and application of small and medium-sized industrial pulverized coal bo...

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Problems solved by technology

[0003] In order to solve the problems of poor adaptability of coal types and high NOx content of flue gas in small and medium-sized industrial pulverized coal boilers, the present invention provides an extended small and medium-sized industrial pulverized coal boiler in which pulverized coal and liquefied petroleum gas are co-fired in a swirling state Apparatus and method for coal types

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