Combined type circulating fluidized bed gasification device and method

Abstract

The invention relates to a combined type circulating fluidized bed gasification device and method, and relates to the technical field of fluidized bed gasification. The device and the method are mainly used for gasifying one or more solid carbonaceous matters in organic waste such as gasified coal, petroleum coke, biomass, garbage, sludge and the like or mixtures of the solid carbonaceous matters and other gas and liquid organic matters, higher gasification efficiency is obtained through improvement of raw material adaptability, and clean low-cost fuel gas or synthesis gas is produced. The main technical scheme is that the combined type circulating fluidized bed gasification device comprises a pyrolysis chamber, a gasifying chamber and a cyclone separator which are connected sequentially, wherein a raw material inlet, a pyrolysis gas outlet and a semi-coke outlet are formed in the pyrolysis chamber respectively, and the pyrolysis gas outlet is formed above the semi-coke outlet; a primary air inlet, a pyrolysis gas inlet and a semi-coke inlet are formed in the gasifying chamber, the pyrolysis gas outlet is connected with the pyrolysis gas inlet, and the semi-coke outlet is connected with the semi-coke inlet through an overflow pipe; a gas outlet is formed in the cyclone separator.

Description

technical field [0001] The invention relates to the technical field of fluidized bed gasification, in particular to a composite circulating fluidized bed gasification device and a method thereof. Background technique [0002] Gasification is an important means of clean utilization of coal, biomass, garbage, sludge and other organic wastes, and has been widely used in chemical industry, metallurgy, civil and industrial gas and other fields. The performance of gasification technology directly affects the healthy development of these industries, plays a pivotal role in the control of energy conservation and emission reduction, and is an important guarantee for the realization of relevant national control goals. Coal gasification technology has been developed for hundreds of years, and the gasification technology of biomass and other organic wastes has also developed rapidly since the 1980s. At present, the gasification technologies that have been industrialized mainly include ...

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Problems solved by technology

[0005] In the process of realizing the above technical solution, the inventors found that at least the following problems exist in the prior art: because the semi-coke and pyrolysis gas generated by the reaction in the pyrolyzer enter the gasifier through the same overflow pipe, During long-term operation, the liquid substances in the pyrolysis gas, such as tar, will condense and coke on the wall of the overflow pipe due to the combination of high-temperature cracking and other reactions and semi-coke, and even block the overflow pipe, making the heat It is difficult for the solid and gas products reacted in the decomposer to flow smoothly into the gasifier, thus affecting the stable operation of the entire gasification device; in addition, both solid and gas products enter the gasifier through the same overflow pipe at the same time It will destroy the stability of the flow field in the entrained bed gasifier, and then affect the gasification performance of the entrained bed gasifier

In addition, in the prior art, the fly ash separated by the cyclone separator is directly mixed with the pyrolysis semi-coke and enters the gasifier, which will inevitably cause cross-effects between the pyrolysis semi-coke and the returned fly ash, which cannot be precisely adjusted And control the circulation amount of the returned fly ash, resulting in fluctuations in the temperature of the gasification furnace, and coking or slagging of the gasification device may occur at the same time, affecting the stable operation of the device

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