Coking-proof multistage ignition combustion apparatus with self-adaption function

Abstract

The invention relates to a coking-proof ignition combustion device with a self-adaption function. Coking occurs inside of the existing combustion apparatus, which influences the safe operation of the combustion device. The invention comprises a first-stage heat source tube, a bellows, a braize airflow charging device, a primary pre-burning device and a backward stage pre-burning device; the primary pre-burning device comprises an inner cylinder and an outer cylinder which are arranged in a sleeved mode; the inner space of the inner cylinder is a primary pre-burning room; the space between theinner cylinder and the outer cylinder is an annular braize airflow passage; two ends of the outer cylinder of the primary pre-burning device are respectively connected with a primary adjustable ring and a backward stage adjustable ring; the inner cylinder of the primary pre-burning device is divided into an ignition section and a coking-proof section; the side wall of the inner cylinder at the coking-proof section is provided with coking-proof holes arranged in an array; and the coking-proof holes are oblique cone through holes. The invention can replace a primary combustion device of air pulverized coal powder of the existing power station boiler, and has more convenient disassembly and replacement; and the coking-proof holes have adaptivity and one-way self-locking property of air flow,thereby effectively preventing the coking in the device.

Description

technical field [0001] The invention relates to an ignition and combustion device for multi-stage ignition and self-adaptive anti-coking function, which is suitable for boilers using pulverized coal as fuel. Background technique [0002] In the electric power industry, the pulverized coal boilers of power stations usually use expensive light oil to ignite and raise the furnace when starting up, and also need to use light oil to stabilize the combustion when the load is low or the coal quality is deteriorating. At the same time, with the development of large-scale unit capacity, more units in the power grid are required to participate in peak regulation, resulting in a substantial increase in ignition and combustion-supporting oil. However, since 2003, my country's oil imports and consumption have surpassed Japan, ranking second in the world, and the oil security situation is severe. Therefore, it is of great practical significance to develop new oil-free or oil-less direct ...

AI Technical Summary

Problems solved by technology

However, the ignition and heat release of the pulverized coal airflow presents a strong nonlinearity. Once ignited, the ignition heat released by the pulverized coal airflow further promotes the combustion and heat release of the pulverized coal, which not only increases the internal temperature of the ignition combustion device, but also rapidly consumes the heat in the airflow. Oxygen produces a large amount of CO, which changes the atmosphere in the combustion chamber into a reducing atmosphere, which will easily cause coking of pulverized coal in the combustion device, thus affecting the safe operation of the combustion device

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