Oxygen-enriched combustion circulating fluidized bed poly-generation system and process

Abstract

The invention provides an oxygen-enriched combustion circulating fluidized bed poly-generation system. The oxygen-enriched combustion circulating fluidized bed poly-generation system comprises a circulating fluidized bed combustion furnace and a circulating fluidized bed gasification furnace, wherein the circulating fluidized bed combustion furnace is connected with a separator I, the separator I is connected with a flue at the tail and a two-way material control device, the two-way material control device is connected with the circulating fluidized bed combustion furnace and the circulating fluidized bed gasification furnace respectively, the circulating fluidized bed gasification furnace is connected with the circulating fluidized bed combustion furnace by a return feeder I, the circulating fluidized bed gasification furnace is connected with a ceramic dust collector and a coal gas purification system by a separator II, the flue at the tail is connected with a flue gas distribution valve by a glue gas dust-removal, desulfurization and denitration device, and an outlet of the flue gas distribution valve is divided into three paths. The invention also provides an oxygen-enriched combustion circulating fluidized bed poly-generation process. The oxygen-enriched combustion circulating fluidized bed poly-generation system has high fuel utilization rate, high coal gas yield, good tar quality, small pollutant discharge and low recycling cost, and fuel and flue gas at the tail can be utilized to the maximum extent.

Description

technical field [0001] The invention relates to an oxygen-enriched combustion circulating fluidized bed polygeneration system and process, belonging to the technical field of coal polygeneration. Background technique [0002] At present, the utilization efficiency of existing resources in our country is relatively low, especially in coal-fired power generation or power station heating, the energy conversion efficiency is lower than 40%, while the utilization efficiency of coal in coking, oil refining and other chemical industries is relatively high, which can reach 85%. %~90%. Clean and efficient use of coal resources and promotion of coal polygeneration have become one of the key research directions of the national strategy. Coal polygeneration technology refers to the organic integration of various coal conversion and utilization technologies to obtain a variety of clean secondary energy sources, such as electricity, liquid fuels, gaseous fuels, and various high value-add...

AI Technical Summary

Problems solved by technology

The fluidized bed carbonization furnace uses recirculating gas or steam as the fluidizing gas. The temperature in the carbonization furnace is low, and only the pyrolysis reaction of coal occurs. Most of the coke is sent into the combustion furnace without any reaction in the carbonization furnace. Combustion, the gas yield is very low, and part of the gas is reused as fluidization gas, so the gas yield is lower; the tar yield produced by the fluidized bed carbonization furnace is high, but the tar and dust are difficult to separate, and the tar product has a large ash content and is difficult to achieve industrial application

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