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Crushed coal pressurized gasification gas-water separation and recycling system and method

A pressurized gasification of crushed coal, gas-water technology, applied in chemical instruments and methods, heating water/sewage treatment, degassed water/sewage treatment, etc., can solve the problem of gas-water separation and recovery processes that cannot meet modern requirements, pollution Many discharge points, harsh site environment and other problems, to achieve the effects of small footprint, short treatment process, and low operating costs

Pending Publication Date: 2021-02-02
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the development of coal gas technology, it is gradually developing in the direction of large-scale, energy-saving, environmental protection, high efficiency and stability. The current gas-water separation and recovery process of the pulverized coal pressurized gasification technology commonly used cannot meet modern requirements, mainly reflected in:
[0005] 1. The existing gas water treatment system collects different types of gas water from different equipment for gas water separation and recovery. There are multiple separators and buffers in the device process, which not only causes the entire gas water separation And the recovery system occupies a large area, high investment, high operating cost, and the process is long, and there are many equipments, so that there are many pollutant discharge points, which is easy to cause serious environmental pollution
[0006] 2. Multiple buffers and separators are used in the existing gas-water separation and recovery system. These devices are operated at normal pressure, which is likely to cause the discharge of VOCs (Volatile Organic Compounds, volatile organic compounds) and odors that cannot be collected. Centralized processing makes the site environment harsh

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  • Crushed coal pressurized gasification gas-water separation and recycling system and method
  • Crushed coal pressurized gasification gas-water separation and recycling system and method
  • Crushed coal pressurized gasification gas-water separation and recycling system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The crushed coal in this example is Jincheng anthracite with a water content of 5%. The coal sample is crushed and sieved to obtain a coal sample with a particle size of 5-50 mm, which is loaded into a crushed coal pressurized gasifier for pressurized gasification of the crushed coal , the gasification pressure is 4.0MPa, and the gasification temperature is 1250°C. The crude gas produced by gasification is divided into high-temperature gas water and low-temperature gas water according to the dust content, temperature and pressure in the water during washing. The high-temperature gas water is based on the dust content, The temperature and pressure are divided into transformed high-temperature condensate and gasified dust-containing gasified water. The low-temperature gas water is divided into transformed low-temperature condensate, low-pressure gasified gas water and low-pressure start-up gas water according to the dust content, temperature and pressure. The gas and water...

Embodiment 2

[0068] The crushed coal in this example is Jincheng anthracite with a water content of 6%. The coal sample is crushed and sieved to obtain a coal sample with a particle size of 5-50mm, which is loaded into a crushed coal pressurized gasifier for pressurized gasification of the crushed coal , the gasification pressure is 5.0MPa, and the gasification temperature is 1250°C. The crude gas produced by gasification is divided into high-temperature gas water and low-temperature gas water according to the dust content, temperature and pressure in the water during washing. The high-temperature gas water is based on the dust content, The temperature and pressure are divided into transformed high-temperature condensate and gasified dust-containing gasified water. The low-temperature gas water is divided into transformed low-temperature condensate, low-pressure gasified gas water and low-pressure start-up gas water according to the dust content, temperature and pressure. The gas and water ...

Embodiment 3

[0073] The crushed coal in this example is Yangquan anthracite with a water content of 8%. The coal sample is crushed and sieved to obtain a coal sample with a particle size of 5-50mm, which is loaded into a crushed coal pressurized gasifier for pressurized gasification of the crushed coal , the gasification pressure is 7.0MPa, and the gasification temperature is 1350°C. The crude gas produced by gasification is divided into high-temperature gas water and low-temperature gas water according to the dust content, temperature and pressure in the water during washing. According to the dust content, temperature and pressure, it is divided into transformed high-temperature condensate and gasified dust-containing gasified water. Low-temperature gas water is divided into transformed low-temperature condensate, low-pressure gasified gas water and low-pressure driving gas water according to dust content, temperature and pressure. The gas and water of different classifications are separat...

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Abstract

The invention provides a crushed coal pressurized gasification gas-water separation and recycling system and method, and belongs to the field of coal gas separation and recycling. According to the invention, different types of coal gas water are respectively separated and recycled, so that the whole system is small in occupied area, low in investment, low in operation cost, short in treatment flow, less in equipment, less in pollutant discharge points and not easy to cause environmental pollution. By arranging a medium-pressure flash evaporator, a vacuum flash evaporator, a vacuum flash separator, an ammonia distillation tower and other devices and arranging a settling tank and the top of a coal gas water tank to be connected with an inert gas pipeline in a sealed mode, and the whole system and the separation and recycling process keep micro-positive-pressure operation greater than 0.2 kPa, thereby being capable of guaranteeing that VOCs and odor exhausted from the system can be treated in a centralized mode. The coal gas water tank is connected with a second ammonia distillation tower, so that coal gas water going to biochemical treatment equipment can be completely or partially subjected to ammonia distillation through the ammonia distillation tower, and the problem that a biochemical system is difficult to operate stably due to change of different feed coals is solved.

Description

technical field [0001] The invention relates to the technical field of coal gas separation and reuse, in particular to a system and method for gas water separation and reuse of crushed coal pressurized gasification. Background technique [0002] Crude gas produced by pressurized gasification of crushed coal contains a large amount of water vapor, dust and carbonized by-products, such as tar, light oil, naphthalene, phenol, fatty acid, dissolved gas and inorganic salts, etc., and the temperature is relatively high . Therefore, it needs to be cooled and washed to reduce the temperature and remove harmful substances in the crude gas. During the washing and cooling process of crude gas, these impurity components enter the water, forming gas water with various components in three states of gas, liquid and solid. The content of various ingredients is also not the same. Gas water cannot be directly treated by conventional methods such as biochemistry, filtration, and reverse osm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/122C02F101/16
CPCC02F9/00C02F11/122C02F1/06C02F1/52C02F1/40C02F2301/08C02F2101/16C02F1/20C02F3/00
Inventor 李小红左永飞施福富周恩利范辉刘丰力楚可嘉潘玉芹韩鑫凤袁辉峰刘利利李树枫李叶珺徐景亮赵宇宏王红林王芙蓉
Owner SEDIN ENG
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