An energy-saving crushed coal pressurized dry ash gasifier

Abstract

The invention provides an energy-saving crushed coal pressurization and dry ash discharge gasifier. The gasifier comprises a feeding device (1) for communicating two coal locks and a gasifier body and is characterized in that the feeding device (1) for communicating two coal locks is arranged above the gasifier body; a two-channel static coal distributor (2) is arranged at the upper part of the gasifier body; a device (3) for guiding raw gas out from the middle part of a gasifying chamber is arranged at the middle part of the gasifier body; a rotary furnace grate (4) is arranged at the lower part of the gasifier body; a gasifying agent inlet (5) and an ash discharge outlet (6) are formed in the bottom of the gasifier body; the gasifying agent inlet (5) is formed between the rotary furnace grate (4) and the ash discharge outlet (6); the gasifying agent inlet (5) is connected with a gas distribution tube (412) in the rotary furnace grate (4). The gasifier has the advantages of small coat dust bring-out amount and small amount of tar-containing gas water.

Description

technical field [0001] The invention belongs to an energy-saving crushed coal pressurized dry ash gasification furnace. 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 cohesive 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 the coal gasification capacity and the amount of gas...

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 crushed coal pressurized gasifier. It is a serious problem of dust in the crude gas, a lot of low-pressure steam by-products, low water content in the dust-containing tar gas, etc.

[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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