Coal gasification fine slag water treatment device and process

Abstract

The invention discloses a coal gasification fine slag water treatment device and process, and belongs to the technical field of coal gasification device fine slag water treatment. The coal gasification fine slag water treatment device comprises a sludge concentration and precipitation device and a horizontal screw type centrifugal dehydrator. The sludge concentration and precipitation device is communicated with the horizontal screw type centrifugal dehydrator through a first blow-off pipe. The sludge concentration and precipitation device is further communicated with a settling tank. The settling tank is further communicated with a grey water tank. The grey water tank is communicated with a centrifugal dewatering device. The centrifugal dewatering device is further communicated with a dewatered sludge storage tank. The process for treating coal gasification fine slag water by the device comprises the following steps of: S1, settling fine slag water in the settling tank; S2, carrying out primary treatment by the sludge concentration and precipitation device; and S3, carrying out secondary treatment by the centrifugal dewatering device. A treatment process based on a sludge concentration and precipitation device and a centrifugal dehydrator is adopted, the operation effect is met when the change space of solid contained in fine slag water is too large, and precipitation and concentration facilities provide stable operation conditions for the centrifugal machine and enable the centrifugal machine to stably operate for a long time.

Description

technical field [0001] The invention belongs to the technical field of fine slag water treatment of coal gasification devices, and in particular relates to a coal gasification fine slag water treatment device and a process. Background technique [0002] As my country's basic energy source and important industrial raw material, coal strongly supports the development of the national economy. Coal gasification is one of the main ways to use coal cleanly and efficiently. Coal is used as raw material in specific equipment (such as gasification In the furnace), a series of chemical reactions occur between the organic matter in the coal and the gasification agent under high temperature and pressure, so that the solid coal is converted into a combustible gas. Complete combustion produces CO and H 2 In the process of gasification, the inorganic minerals in coal undergo different physical and chemical transformations, accompanied by solid residues formed by residual carbon particles in...

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Problems solved by technology

[0002] As my country's basic energy source and important industrial raw material, coal strongly supports the development of the national economy. Coal gasification is one of the main ways to use coal cleanly and efficiently. Coal is used as raw material in specific equipment (such as gasification In the furnace), a series of chemical reactions occur between the organic matter in the coal and the gasification agent under high temperature and pressure, so that the solid coal is converted into a combustible gas. Complete combustion produces CO and H 2 In the process of gasification, the inorganic minerals in coal undergo different physical and chemical transformations, accompanied by solid residues formed by residual carbon particles in coal. At present, the treatment methods of gasification slag are mainly stockpiling and landfill, which have not yet been applied in large-scale industrialization, resulting in Serious environmental pollution and waste of land resources have caused adverse effects on the sustainable development of coal chemical enterprises. Therefore, the treatment of gasification slag is of great significance and urgent demand

[0003] When the existing coal gasification fine slag is treated by vacuum filter cloth suction filtration and dehydration, there are many problems such as high water consumption, pulp running, and high frequency of filter cloth wear and replacement. Cause secondary pollution, which is far from meeting the current environmental protection system and enterprise energy saving and consumption reduction requirements

Main problems: 1. Serious pollution. The vacuum belt filter is an open device. The fine slag and gray water run on the filter cloth and are completely exposed to the air. The evaporation of gray water and the leakage of fine slag will affect the surrounding air and The environment causes a certain degree of pollution and causes a certain degree of corrosion to the equipment; 2. The daily maintenance cost is high, and the vacuum belt filter needs to invest a lot of money in filter cloth, flushing water and electricity every year; 3. Filter cloth fouling, High frequency of wear and replacement; 4. Bearings, rollers and other mechanical parts are worn out, and maintenance and replacement are more frequent; 5. It is difficult to clean up fine slag accumulated in the dead corner of the frame; 6. Open operation, high ambient humidity

The corrosive gas mixed with water vapor will cause serious corrosion of equipment and electrical components; 7. The feed temperature is high (≥65°C), the fog in the equipment workshop is serious, the operator's vision is poor, and there is a greater safety hazard. Working in this environment for a long time will affect your health

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