Coupling fixed bed oxygen-enriched continuous gasification process

Abstract

The invention discloses oxygen-rich continuous gasification technology for a coupled fixed bed, wherein a solid raw material comprises coal or coke, and a gas raw material comprises oxygen, air and steam; and the oxygen can be mixed with the air into oxygen-rich air first and then is sent into a gas-making furnace, and can also be sent into the gas-making furnace in the form of single gas. The technology is characterized in that the gas-making furnace is that two common gas furnace bodies (A and B) are connected into a whole by a pipeline and a valve, two furnaces alternately upward blow to make gas, and the gas raw material can also comprise carbon dioxide; and the gas-making process comprises the step of the blowing-off of the A and B furnaces, the step of upward blowing of the A furnace, the step of secondary blowing-off of the A and B furnaces, and the step of upward blowing of the B furnace, and the steps are circulated. The gas-making furnace is that the two common gas furnace bodies are connected into a whole by the pipeline and the valve, and the two furnaces alternately upward blow to make gas, so the technology can optimize the distribution of temperature fields in the gas furnaces, reduce the sensible heat loss of semiwater gas, the erosion to pipelines in subsequent working procedures, and the quantity of carry-overs, improve the condition of gas quality, and reduce gas consumption and coal consumption.

Description

technical field [0001] The invention relates to the technical field of coal gasification technology, in particular to the technical field of fixed-bed oxygen-enriched continuous gasification technology. Background technique [0002] Coal gasification is an important step in the production of synthetic ammonia and fuel gas (semi-water gas and water gas), and is the core technology for the development of coal chemical industry. The industrial production of semi-water gas is mainly through the following reactions: first, the oxygen in the air reacts with carbon to generate carbon monoxide and carbon dioxide, which releases heat; secondly, the steam entering the furnace reacts with hot carbon to generate carbon monoxide, carbon dioxide and hydrogen, which absorbs heat. The product of the above reaction together with the nitrogen in the air that has not participated in the reaction constitutes the main component of the semi-water gas. [0003] At present, the fixed-bed coal gasi...

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Problems solved by technology

[0004] 1. The blowing intensity is high, the output is large, and the coal utilization efficiency is low. The coal consumption per ton of ammonia into the furnace is 1.6-2.2 tons, and the gas production capacity of a single furnace is low.

[0005] 2. The blowing air contains carbon monoxide, carbon dioxide and sulfur dioxide, polluting the environment

[0009] 1. One-way gas blowing, the temperature gradient changes in one direction from bottom to top, and the sensible heat of high-temperature semi-water gas cannot be recycled. The temperature of semi-water gas is as high as 550-650°C, causing a large loss of sensible heat. It will cause severe erosion of the pipeline in the subsequent process

[0010] 2. The coal consumption per ton of ammonia is 1.5-1.6 tons, the oxygen consumption is 450-600 standard cubic meters, and the steam consumption is 2.5 tons. The utilization rate of raw materials is still low, which is not economical enough

[0011] 3. The content of carbon dioxide in semi-water gas is as high as 18-23%, resulting in only 62-68% of active ingredients

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