Process and device for producing energy-saving briquette coal to syngas

Abstract

The invention discloses an energy-saving process and an energy-saving device for producing synthesis gas from coal. When crushed coal is gasified and then passes through a crude gas leading-out device (3) in the middle of a gasification chamber, crude gas of which the volume ratio is 5-60 percent is extracted, crude gas which is de-dusted by virtue of a cyclone separator I (20) enters a waste heat boiler I (8), and waste heat is recycled; crude gas of which the residual volume ratio is 40-95 percent is led out by a gas channel III on a double-channel static coal distributor (2) and passes through a washing cooler I (5), and then the waste heat is recycled from a waste heat boiler II (24); the cooled crude gas is separated to obtain condensed fluid by virtue of a gas liquid separator (11), crude gas (18) is conveyed to a downstream process, and the washed condensed fluid is conveyed to a gas water separation device (15) for recycling. The process and the device have the advantages of energy conservation, low operation cost, small coal dust take-out amount and less tar-containing gas water.

Description

technical field [0001] The invention belongs to the field of coal-based clean gas, and in particular relates to an energy-saving coal-based synthetic gas process and device. Background technique [0002] Crushed coal pressurized gasifier is a fixed bed coal gasifier, due to the low requirements for raw coal, that is, except for strong caking coal, other coal types can be gasified, especially low-rank coal and high ash melting point low quality coal. The gasifier is widely used in the field of coal-to-synthetic ammonia, methanol, dimethyl ether, synthetic oil and coal gas. As the current coal gasification technology develops in the direction of large diameter and high pressure, the amount of coal processed per unit time is gradually increasing. As a coal inlet for pressurized gasification of crushed coal, the coal lock needs to be continuously pressurized and released. To meet the development needs of large-scale coal gasification, in addition, the high pressure increases t...

AI Technical Summary

Problems solved by technology

As the current coal gasification technology develops in the direction of large diameter and high pressure, the amount of coal processed per unit time is gradually increasing. As a coal inlet for pressurized gasification of crushed coal, the coal lock needs to be continuously pressurized and released. To meet the development needs of large-scale coal gasification, in addition, the high pressure increases the coal gasification capacity and the amount of gas produced, coupled with the poor thermal stability of low-rank coal, etc., a single gas outlet will inevitably bring out a large amount of coal dust, resulting in subsequent gas Washing cooling, waste heat recovery and other sections cause blockage or separation difficulties. At the same time, excessive water is used for washing in the washing process, resulting in an increase in the production of gas and water and a decrease in high-grade heat.

[0003] Chinese Patent No. 200580041975.8 discloses a fixed-bed coal gasifier with a single coal lock and a single gas outlet on the static distributor. This gasifier is a commonly used pressurized gasifier for crushed coal at present, and there are outstanding problems The problem of dust in the crude gas is serious, the by-product is more low-pressure steam, and the gas contains dust, tar and water.

[0004] Chinese patent: 201320037548.4 discloses the use of a single coal lock, no static distributor, and a single gas channel, which also has the above problems

The purpose of this patent is to reduce the gas enrichment area, reduce the gas flow rate, and reduce the amount of coal dust carried out. It has a certain effect, but the effect is limited

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