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

A pressurized gasification of crushed coal, gas-water technology, applied in chemical instruments and methods, biological water/sewage treatment, heating water/sewage treatment, etc., can solve the problem that gas-water separation and recovery processes cannot meet modern requirements and cannot fully Utilize the heat of condensate and the large amount of waste water of biochemical treatment equipment to achieve the effect of small footprint, less waste water and less equipment

Inactive Publication Date: 2021-02-26
SEDIN ENG
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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, resulting in the entire gas water separation and recovery system occupying a large area, high investment, and high operating costs;
[0006] 2. The current gas-water separation and recovery process is long and there are many equipments, resulting in many p

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 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. Different classif...

Embodiment 2

[0070] 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

[0075] 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 capable of recycling sewage, and belongs to the field of 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, the whole system and the separation and recycling process keep micro-positive-pressure operation larger than 0.2 kPa, and therefore it can be guaranteed that VOCs and odor exhausted from the system can be treated in a centralized mode. The water outlet of the second vacuum flash evaporator is connected with the water inlet of the heat exchanger connected with the waste heat boiler through thepipeline and the water pump, so that recycling of waste water is realized; therefore, the amount of waste water going to biochemical treatment equipment can be reduced, and heat in the waste water canbe fully utilized.

Description

technical field [0001] The invention relates to the technical field of coal gas separation and reuse, in particular to a crushed coal pressurized gasification gas water separation and reuse system and method capable of reusing sewage. 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, filtrati...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F11/122C02F101/16
CPCC02F9/00C02F11/122C02F1/06C02F1/52C02F1/40C02F2301/08C02F2101/16C02F1/20C02F3/00
Inventor 左永飞李小红范辉施福富周恩利刘丰力李金洲楚可嘉车丽玮韩鑫凤袁辉峰刘利利李树枫李叶珺徐景亮赵宇宏刘于英陈党辉
Owner SEDIN ENG
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