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Circulating Fluidized Gasification System

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Process Flow:After crushing and sieving, the coal ( size≤10mm) is carried to coal scuttle by belt conveyors, conveyed to gasifier by screw feeder; and reacts with gasification agent(air or oxygen-enriched air)which was preheated to high temperature roughly through high temperature preheater in the gasifier, temperature is about 950℃. Streams are in the fluidization state , the furnace contains no dry distillation layer, and the tar, phenol and cyanide decompose completely under high temperature.
Coal gas flows through cyclone separator, high temperature preheater, waste heat recovery, fly-ash filter and gas coolerA/B for cooling down and dust removal. After desulphurization and compression, the gas can be sent to users.

Circulating Fluidized Bed Gasification System

 
Process Flow:After crushing and sieving, the coal ( size≤10mm) is carried to coal scuttle by belt conveyors, conveyed to gasifier by screw feeder; and reacts with gasification agent(air or oxygen-enriched air)which was preheated to high temperature roughly through high temperature preheater in the gasifier, temperature is about 950℃. Streams are in the fluidization state , the furnace contains no dry distillation layer, and the tar, phenol and cyanide decompose completely under high temperature.
Coal gas flows through cyclone separator, high temperature preheater, waste heat recovery, fly-ash filter and gas coolerA/B for cooling down and dust removal. After desulphurization and compression, the gas can be sent to users.
图片2
Flow Chart
Features:
1. Clean: no three wastes discharge in production process; in the gas, H2S≤20 mg/Nm 3, dust≤10mg/Nm 3, almost the same cleanness as class II natural gas.
2. Efficient: with full counter-current heat transfer, more than 90% of gas sensible heat can be recovered; high-temperature combustion technology can significantly increase gas calorific value.
3. High productive capacity: the gas production of single gasifier can be up to 80kNm3/h, and load range can be adjusted.
4. Safe and stable operation: perfect safety protection interlock, one-button parking; key equipment can be replaced online, the longest running period of a single furnace is more than 12 months.
5. It has been widely used in alumina, steel, ceramics, coking, carbon and other industries.
 
Coal index
Recommended coal Qnet,ar Vad Aad CRC S.T.
Bituminite, sub-bituminous,lignite coal ≥4500kcal/kg ≥28% ≤20% ≤4 ≥1150℃
 
Note: the calorific value of lignite is the index after drying.
Gas composition
If the mixture of air and steam are used as gasifying agent, the gas composition are as follows:
 
Component CO H2 CH4 CO2 N2 Qnet/kcal/Nm3
Vol.-% 20~24 18~22 1~3 8~12 45~50 ≥1250
 
If oxygen-enriched air and steam are used as gasifying agent, the gas composition are as follows:
Component CO H2 CH4 CO2 N2 Qnet/kcal/Nm3
Vol.-% 23~40 23~40 2~3 12~14 30~35 1400~2200

ACHIEVEMENTS
KEDA has contracted clean coal gasification equipment 88 sets at home and abroad .Application fields cover ceramics, aluminum, carbon, glass,, steel, cooking, synthetic ammonia, coal chemical industry, etc.
 
PROJECT REFERENCES
Nanyang,Henan
In May 2019, 1 set of 60kNm 3/h CFBC clean coal gasification equipment has been completed and accepted in Nanyang Hanye Special Steel CO.,Ltd., it is the first time for the company to apply circulating fluidized bed gasification technology to steel industry.
 
河南南阳项目
 
Xiaoyi, Shanxi
In Aug. 2014, 8 sets of 20kNm 3/h CFBC clean coal gasification equipment put into operation in Xinfa Group, located in Xiaoyi City,Shanxi Province. After the project was completed, it provided clean and stable fuel for alumina roasting, which greatly reduced the production cost of the enterprise.
In Aug. 2018, 3 sets of 60kNm 3/h CFBC clean coal gasification equipment in Xinfa Group put into operation.

山西孝义项目

Fukang, Xinjiang
In Jun. 2017, 2 sets of 10kNm 3/h CFBC clean coal gasification equipment put into operation in Xinjiang heaven dragon mining Co., Ltd., it is the first time for the company to apply circulating fluidized bed gasification technology to carbon industry after alumina and ceramic industry.

新疆阜康项目

Jingxi, Guangxi
2012-2014, Guangxi Xinfa Aluminum Refinery ordered 4 sets of 10 kNm 3/h, 8 sets of 20 kNm 3/h, and 2 sets of 40 kNm 3/h clean coal gasification equipment.
Since 2013, phase I, phase ii and phase iii projects have been completed and put into operation, and the total gas production capacity is 280kNm 3/h, which can meet the demand of alumina production in the factory.
Use KEDA circulating fluidized bed coal gasification system to replace the original backward single sections of gas occurrence boiler gasification system, greatly improving the environmental pollution problem, improve the efficiency of the coal gasification, the owner accounting alumina can save costs 100 yuan per ton, save costs 280 million yuan.

  广西靖西项目

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