Double distribution plate coal-base serial fluidized-bed chemical chain combustion apparatus

Abstract

The invention belongs to the gas-solid fluidized bed reactor field and relates to a dual-distributing plate coal-based serial fluidized bed chemical-chain combustion apparatus suitable for the chemical-chain combustion of burning coal and other solid fuels; the bottom of a bubbling fluidized bed is provided with a gas inlet and a feed port; the inside of the bubbling fluidized bed is divided into three regions by two distributing plates; the bottom of a low gas velocity region and the bottom of a high gas velocity region are respectively provided with a distributing plate; the middle between two regions is provided with a transition region with a reduce section to realize different gas flow velocities in the low gas velocity gasification region and the high gas velocity deoxidization region; the upper part of a bubbling fluidized bed is in tubular communication with the upper part of a cyclone separating device; the top of the cyclone separating device is provided with an exhaust port which is communicated with a gas inlet of the bubbling fluidized bed; the lower part of the cyclone separating device is pumped to the low gas velocity gasification region by a feed leg; the bottom of the high gas velocity deoxidization region is communicated with a circulating fluidized bed by a feed returning device; the bottom of the circulating fluidized bed is provided with an air inlet; the upper part of the circulating fluidized bed is communicated with the cyclone separating device. The dual-distributing plate coal-based serial fluidized bed chemical-chain combustion apparatus has the advantages of low cost, flexible operation, high thermal efficiency, wide application range, etc.

Description

Technical field: [0001] The invention belongs to the field of gas-solid fluidized bed reactors, and relates to a double distribution plate coal-based serial fluidized bed chemical chain combustion device, which is suitable for burning solid fuels such as coal. Background technique: [0002] At present, chemical chain combustion is a brand-new combustion concept. The fuel in this combustion state does not directly contact with the air for combustion, but the combustion process of the fuel is realized by the alternating reaction of the oxygen carrier between the two reactors. Compared with the traditional combustion method of direct contact with air, flame, one-step chemical reaction, and high combustion temperature, the chemical looping combustion method realizes the cascade utilization of chemical energy and has higher energy utilization efficiency; more importantly, , in the chemical looping combustion mode, the fuel does not directly contact with the air, and the combustio...

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Problems solved by technology

[0003] In contrast, in order to realize the chemical looping combustion method in the existing conventional solid fuel combustion device, a separate gasifier must be added for the gasification of pulverized coal, which greatly increases the investment cost and requires additional heat consumption, and the operation is also relatively complicated. Difficulty; for some improved devices, the pulverized coal gasification and the reduction of the oxygen carrier are integrated in one device, although the cost of a gasifier is saved, and the heat utilization rate is also improved, so that the reactor can be self-sufficient The effect of thermal cycle reaction, but there are still some insurmountable shortcomings

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