Pulverized coal pre-pyrolyzation decoupling combustion device

Abstract

The invention discloses a pulverized coal pre-pyrolyzation decoupling combustion device comprising a pyrolysis chamber, a cyclone separator, an ejector device and a particle burning device; the pyrolysis chamber is provided with a raw material inlet and a product outlet; the cyclone separator is provided with a product inlet, a volatile component outlet and a particle outlet; the product inlet ofthe cyclone separator communicates with the product outlet of the pyrolysis chamber through a pyrolysis product transport passage; a reburning fuel pipe is arranged at the volatile component outlet ofthe cyclone separator; a discharging pipe is arranged at the particle outlet of the cyclone separator; the reburning fuel pipe is used for being led into a hearth; the discharging pipe communicates with a particle combustion device through the ejector device; ejector gas flow is led into the ejector device; a particle combustion device comprises an air duct; and the air duct is led into the hearth. The pulverized coal pre-pyrolyzation decoupling combustion device is based on the decoupling idea, is suitable for pulverized coal decoupling combustion, can achieve the higher pulverized coal combustion rate, is relatively good in combustion stability, and can effectively suppress NOx generation.

Description

technical field [0001] The invention belongs to the technical field of pulverized coal combustion equipment, in particular to a pulverized coal preheating, decoupling and decoupling combustion device. Background technique [0002] In the actual engineering case of burning pulverized coal, NO x Emissions and pulverized coal burnout have always been two factors that restrict each other. The burnout rate of pulverized coal increases with the combustion temperature and oxygen concentration in the combustion stage, but the high temperature and oxygen-enriched combustion conditions will greatly promote the NO x On the contrary, if the temperature and oxygen concentration in the combustion stage are reduced, although the NO in the combustion stage can be suppressed x However, the ignition stability of pulverized coal is affected, and the burnout rate is reduced, and the carbon content of fly ash and slag of pulverized coal will increase. Therefore, in achieving low NO x It has ...

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Problems solved by technology

Chinese Patent Announcement No. "CN102297425B" discloses "a pulverized coal decoupling burner and its decoupling combustion method", which uses the idea of ​​decoupling combustion to invent a pulverized coal decoupling combustion burner and a The combustion method of decoupled combustion, through inertial separation and powder collection to stabilize the flame, divides the pulverized coal into three strands with uneven concentration, and sends them into the furnace from thick to light respectively to achieve the conditions of decoupled combustion, thereby suppressing NO x formation, but the stability of combustion will be affected, and with the addition of oxygen, NO x The formation of the still cannot be effectively suppressed

[0006] Chinese Patent Publication No. "CN205090371U" discloses "a high-efficiency and clean combustion device", which uses the idea of ​​decoupling combustion to divide the combustion process of coal into two processes: gas combustion and coke combustion, and separate them in the gas combustion chamber. Combustion with coke combustion chamber, but the combustion device is mainly aimed at the combustion of coal or briquette, and the combustion method is a fixed bed burner placed on the grate for combustion, which cannot effectively solve the problem of pulverized coal combustion

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