Effect of oxygen and steam on gasification and power generation in industrial tests of underground coal gasification
| Autor: | Lin Xin, Wen-gang Huang, Zuo-tang Wang, Tian-hong Duan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Waste management
business.industry 020209 energy General Chemical Engineering Organic Chemistry Energy Engineering and Power Technology Exhaust gas 02 engineering and technology Combustion complex mixtures Fuel Technology Electricity generation 020401 chemical engineering Underground coal gasification 0202 electrical engineering electronic engineering information engineering Environmental science Coal Heat of combustion 0204 chemical engineering business Gas generator Syngas |
| Zdroj: | Fuel. 289:119855 |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/j.fuel.2020.119855 |
| Popis: | To optimize the gasification process and improve the underground coal gasification (UCG) technology for power generation, a pilot project of UCG integrated with the power generation was built in the abandoned mine “Ankou”. The UCG industrial tests with different oxygen concentrations of oxidant along with the pulsed injection method, and power generation experiments using UCG syngas were conducted. The results indicate that a decrease in the rate of air blowing for a short time exhibited a limited influence on syngas production, but a change in the amount of oxygen injection presented an obvious effect. With the increase in the oxygen concentration in the agent, the H2 content, combustible components and calorific value of syngas, flow ratio, and the consumption of coal, steam and oxygen increased, along with a rise in the gasification efficiency after an initial drop. The oxygen-enriched gasification trials showed higher air consumption, lower consumption of coal, steam and oxygen, and a low combustible components and calorific value of syngas compared to the gasification tests of the oxygen-enriched steam. The evaporation of ground water and coal moisture in the UCG panel provided steam for the oxygen-enriched gasification process, and its utilization rate was about 6–32 wt%. From the characteristics of UCG syngas, the technical transformations such as exhaust gas booster combustion control, high energy ignition, low pressure intake, expansion of the air, and gas inlet pipe diameter were carried out on the existing gas generator sets. The effectiveness of the measures was verified by the power generation experiments. |
| Databáze: | OpenAIRE |
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