A continuous supercritical water gasifier for Zhundong coal

Abstract

The invention discloses a continuous supercritical water gasifier for Zhundong coal. An upper end cover and a lower end cover are fixed to the upper end and the lower end of a fluidized bed body; the fluidized bed body is provided with a reaction cavity; the center of the upper end cover is provided with a reaction produced liquid outlet communicated with the reaction cavity; the middle of the fluidized bed body is horizontally provided with a coal slurry inlet communicated with the reaction cavity, the lower portion of the fluidized bed body is downwardly and obliquely provided with a residue outlet communicated with the reaction cavity; a fastener is arranged at the lower end of the fluidized bed body, and a distribution plate is arranged at the upper end of the fastener; the center of the lower end cover is provided with a supercritical water inlet; one end of the fastener is abutted against the distribution plate while the other end of the fastener is abutted against the lower end cover to fix the distribution plate. The continuous supercritical water gasifier has advantages that high-efficiency gasification of the Zhundong coal in a supercritical water environment can be realized, and clean utilization of the Zhundong coal is realized; more importantly, the problem of contamination caused by high sodium content of the Zhundong coal in a traditional coal-fired boiler is avoided, and a catalyzing effect of sodium in a gasification process is fully utilized.

Description

technical field [0001] The invention belongs to the field of high-efficiency and clean utilization of Zhundong coal, in particular to a continuous supercritical water gasifier of Zhundong coal. Background technique [0002] The Zhundong coalfield is the largest open-pit coalfield in the world, with a predicted reserve of 3.9×10 11 t, the mining cost is low. Zhundong coal has high moisture and volatile content, very low ash and sulfur content, and medium calorific value (cartridge value 20.539MJ / Kg); Zhundong coal has a significantly high equivalent sodium content, which belongs to coal with serious pollution kind. [0003] Alkali metals in Zhundong coal are likely to cause slagging, contamination, ash deposition and corrosion in power plants, affecting the normal operation of boilers. If the power plant boiler burns more than 40% of Zhundong coal, the furnace burner will appear Severe slagging in the area; fouling, blockage and corrosion on the smoke side of panel superhe...

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Problems solved by technology

[0004] The traditional tube-flow continuous reactor has problems such as feed coking and clogging, which not only reduces the efficiency of coal gasification, but also affects the continuous and stable operation of the reactor

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