Low-energy coal water slurry gasification system and coal water slurry heating method

Abstract

The invention discloses a low-energy coal water slurry gasification system. The system comprises a coal storage bucket, the discharge port of the coal storage bucket is connected with a coal weighingfeeder, the coal weighing feeder is connected with the inlet of a coal mill, the coal mill is connected with a mill discharge tank, the outlet of the mill discharge tank is connected with a mill discharge tank pump, the mill discharge tank pump is connected with a coal slurry tank, the coal slurry tank is connected with a coal slurry feeding pump, the coal slurry feeding pump is connected with a gasification furnace through a coal slurry conveying tube, the coal slurry conveying tube is provided with a heating device, and the coal slurry conveying tube is further provided with a temperature detecting device. The invention also discloses a coal water slurry heating method. A coal water slurry in the coal slurry conveying tube can be heated, and the temperature of the coal water slurry in the conveying tube can be kept within a certain temperature range, so the coal consumption and the oxygen consumption are reduced, and the discharge amount of carbon dioxide is reduced.

Description

technical field [0001] The invention relates to a low-energy-consumption coal-water slurry gasification system and a method for heating the coal-water slurry, belonging to the field of coal-water slurry gasification in the coal chemical industry. Background technique [0002] The coal-water slurry gasification process is to transport the coal-water slurry prepared by grinding coal and water through a mill to the gasifier to react with oxygen to generate water-gas. This reaction is carried out at a high temperature of 1350°C. Since the coal-water slurry contains 30-35% water, when it reacts with oxygen and burns, it evaporates water and absorbs the heat in the gasifier. In order to maintain the furnace temperature of the gasifier, it is necessary to fill it with coal to maintain the temperature in the gasifier. In order to ensure the reaction conditions when the water gas is generated, and the coal water slurry will lose about 3% to 4% of the calorific value of the gasifier d...

AI Technical Summary

Problems solved by technology

Therefore, in the process of water gas production, the coal consumption and oxygen consumption of the system are large during operation, and the operation cost is high

In chemical production, the general heating method is to use a heat exchanger, but the heat exchanger will increase the transportation resistance of the coal-water slurry, and the coal slurry is easy to block the heat exchanger, which affects the stability of production

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