Continuous pressure-relief deslagging method and system of liquid-state pressure-boosting deslagging gasifier

Abstract

The invention discloses a continuous pressure-relief deslagging system and a continuous pressure-relief deslagging method of a liquid-state pressure-boosting deslagging gasifier, and is used for solving the problems that an existing deslagging system is complex in technical process, complicated to operate, high in equipment investment and poor in reliability. The method comprises the following steps: carrying out water-bath chilling on high-temperature and high-pressure slags which are generated by the pressure-boosting gasifier and fall into the bottom of the pressure-boosting gasifier; then feeding the high-temperature and high-pressure slags into a slag crusher for crushing, wherein the crushed high-pressure slags flow into a pressure-reducing pipe along with water; further carrying out pressure reduction on a mixture which contains high-pressure gas and a small amount of fine slag water and is generated when a slag-water mixture passes through the pressure-reducing pipe for pressure relief; then sending the slag-water into a gas discharging tank and carrying out washing and gas-liquid separation; feeding the slag-water mixture subjected to pressure relief into a slag collecting tank; and finally, discharging into a slag conveyor, wherein the discharging gas at the top of the inside of the gas discharging tank is sent to a torch while the slag water at the bottom of the inside of the gas discharging tank is sent into the slag collecting tank. The method disclosed by the invention is simple and reliable in process, flexible, simple and convenient to operate and low in running cost, and realizes energy conservation and consumption reduction. The system disclosed by the invention is simple, low in equipment investment, high in reliability and long in service life.

Description

Technical field [0001] The invention relates to the field of coal gasification, in particular to a method and system for slagging a pressurized gasification furnace. Background technique [0002] At present, pressurized gasifiers have been widely used in chemical, metallurgy, machinery and other industries. According to the reaction temperature and ash status in the gasifier, the slag discharge of the pressurized gasification furnace can be divided into solid slag and liquid slag: when the gasification reaction temperature is lower than the melting temperature of the ash, the slag will be in solid form Discharge; When the reaction temperature of the gasifier is the melting temperature of the high pressure ash slag, the molten ash can flow freely, and the slag will be discharged in liquid form. Since the gasification reaction temperature of a pressurized gasifier is generally relatively high, taking the coal gasifier as an example, a pressurized gasifier adopting entrained bed ga...

AI Technical Summary

Problems solved by technology

[0003] The current liquid slagging system of the pressurized gasifier basically adopts the slagging system with a lock hopper decompression device. This system has the following shortcomings and deficiencies: ①The slagging method of the gasifier is intermittent, which cannot Realize a continuous and stable slag discharge process; ②Using the lock bucket system, a set of slag discharge valves need to be added at the upstream and downstream of the lock bucket, and the system is prone to failure; ③The lock bucket system is divided into slag collection, decompression, slag discharge, cleaning, There are five pressurization processes and reciprocating cycles, and the operation and control system is complex; ④The investment and operation costs of the lock bucket slag discharge system are high, maintenance is difficult, and the cost is high

⑤ The process of the lock bucket system is complicated, the energy consumption is high, the reliability is not high, and the economy is poor

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