Dual fluidized bed gasification-combustion coupling equipment for preparing synthesis gas with high concentration from solid fuel

Abstract

This invention discloses a double-fluidized-bed gasification-combustion coupled device for preparing high-concentration synthesis gas from solid fuel. The device is composed of fluidized beds, a synthesis gas outlet, a steam inlet and a gas distributor. The fluidized beds comprise a primary fluidized bed and a secondary fluidized bed. Straight pipe and expansion section connected at its end constitute the secondary fluidized bed. The top of the expansion section is the flue gas outlet. The bottom of the straight pipe is the slag outlet, and its lower part is connected with a first wind inlet and a second wind inlet. Besides, the lower part of the straight pipe is also through connected with the lower part of the primary fluidized bed via a circulation inclined pipe. The expansion section is through connected with the middle of the primary fluidized bed via a vertical pipe and an L-shaped valve. The top of the primary fluidized bed is the synthesis gas outlet, and its bottom is connected with the steam inlet and the gas distributor. The fuel inlet is set at the middle of the primary fluidized bed. The device has such advantages as simple structure, and easy operation.

Description

technical field [0001] The invention belongs to a gasification-combustion device, in particular to a double-fluidized-bed gasification-combustion coupling device for preparing high-concentration synthesis gas from solid fuel. Background technique [0002] Coal is the dominant energy source in China and currently accounts for more than 75% of primary energy consumption. With the adjustment of the energy structure, although the proportion of coal has declined, the total coal consumption has shown an increasing trend year by year. It can be seen that the clean coal conversion technology has extremely important strategic significance for the stable and healthy development of the national economy. Petroleum is another important energy source in my country's economic construction. With the heavy and inferior crude oil, the output of petroleum coke shows an upward trend year by year. Therefore, the efficient utilization of petroleum coke is directly related to the economic and soci...

AI Technical Summary

Problems solved by technology

Although Chinese patents (ZL200410051078.2 and ZL03262731.9) have proposed new technologies for biomass and coal fluidized bed gasification respectively, they are all single fluidized bed devices, and their disadvantages are that only air, oxygen-enriched air, Oxygen, water vapor and their mixtures are used as gasification agents. In order to obtain high-purity synthesis gas, either an air separation unit or a subsequent nitrogen separation unit is required upstream, and the equipment investment, device operation and maintenance costs are high

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