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Gas production strategy of underground coal gasification based on multiple gas sources.

Tianhong D, Zuotang W, Limin Z, Dongdong L - ScientificWorldJournal (2014)

Bottom Line: To lower stability requirement of gas production in UCG (underground coal gasification), create better space and opportunities of development for UCG, an emerging sunrise industry, in its initial stage, and reduce the emission of blast furnace gas, converter gas, and coke oven gas, this paper, for the first time, puts forward a new mode of utilization of multiple gas sources mainly including ground gasifier gas, UCG gas, blast furnace gas, converter gas, and coke oven gas and the new mode was demonstrated by field tests.According to the field tests, the existing power generation technology can fully adapt to situation of high hydrogen, low calorific value, and gas output fluctuation in the gas production in UCG in multiple-gas-sources power generation; there are large fluctuations and air can serve as a gasifying agent; the gas production of UCG in the mode of both power and methanol based on multiple gas sources has a strict requirement for stability.It was demonstrated by the field tests that the fluctuations in gas production in UCG can be well monitored through a quality control chart method.

View Article: PubMed Central - PubMed

Affiliation: School of Mining Technology, China University of Mining and Technology, Jiangsu, Xuzhou 221116, China ; State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, Jiangsu, Xuzhou 221116, China ; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Jiangsu, Xuzhou 221116, China.

ABSTRACT
To lower stability requirement of gas production in UCG (underground coal gasification), create better space and opportunities of development for UCG, an emerging sunrise industry, in its initial stage, and reduce the emission of blast furnace gas, converter gas, and coke oven gas, this paper, for the first time, puts forward a new mode of utilization of multiple gas sources mainly including ground gasifier gas, UCG gas, blast furnace gas, converter gas, and coke oven gas and the new mode was demonstrated by field tests. According to the field tests, the existing power generation technology can fully adapt to situation of high hydrogen, low calorific value, and gas output fluctuation in the gas production in UCG in multiple-gas-sources power generation; there are large fluctuations and air can serve as a gasifying agent; the gas production of UCG in the mode of both power and methanol based on multiple gas sources has a strict requirement for stability. It was demonstrated by the field tests that the fluctuations in gas production in UCG can be well monitored through a quality control chart method.

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Change of output of the single generating unit after the BFG was used.
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Related In: Results  -  Collection


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fig4: Change of output of the single generating unit after the BFG was used.

Mentions: To verify the impacts of adverse factors such as high hydrogen, low calorific value, and fluctuations of both calorific value and gas output and prove the UCG gas production strategy for “multiple-gas-sources” power generation, the research group with which the author works with did field tests about UCG in a mine. See Figure 1 for process flows of the field tests. In the period, the gases generated by gasifying agents of different concentrations were combined with BFG and COG and used in a power generation test done for a 500GF-PWY generating unit produced by Shengli Oil Field Shengli Power Machinery Group Co., Ltd. From 17:00 of September 20 to 17:00 of September 22 in 2010, the air gas produced in UCG was mixed with BFG and used in another power generation test. In the test, the air gas produced in UCG had a calorific value of 4.10 MJ/Nm3 (978.60 kCal/Nm3) only on average and fluctuated greatly (Figure 2): the maximum and minimum calorific values were 4.49 MJ/min and 3.97 MJ/min, respectively; the maximum fluctuation was up to 126.27 kCal/Nm3; the coefficient of variation was 0.05. In addition, the product of calorific value and flow fluctuated greatly too (Figure 3): the maximum and minimum products were 610.98 MJ/min and 539.02 MJ/min, respectively; the maximum fluctuation was up to 71.95 MJ/min; the coefficient of variation was 0.04. However, after the BFG was used, output of the generating unit became stable and reliable in the whole test; see Figure 4. After the BFG was used, the output of single generating unit fluctuated less than calorific value of air gas per minute as shown in Figure 3. The coefficient of variation of single output of the generating unit was 0.02. This also suggests that air can be used as a gasifying agent. From 22:15 of July 30 to 2:00 of August 8 in 2010, a moderately oxygen-enriched steam gas was mixed with COG and used in another power generation test. In the test, the hydrogen concentration of the gas mixture reached 46.19 percent at most and the generating unit ran stably and reliably, suggesting high adaption of the generating unit to a high hydrogen condition. The moderately oxygen-enriched steam gas generated in UCG had a greatly fluctuating calorific value (Figure 5): the maximum and minimum calorific values were 6.45 MJ/min and 7.45 MJ/min, respectively; the maximum fluctuation was up to 126.27 kCal/Nm3; the coefficient of variation was 0.05. In addition, the product of calorific value and flow fluctuated greatly too (Figure 6): the maximum and minimum products were 619.26 MJ/min and 429.07 MJ/min, respectively; the maximum fluctuation was up to 190.20 MJ/min; the coefficient of variation was 0.03. However, after the COG was used, output of the generating unit became stable and reliable in the whole test, as shown in Figure 9. After the COG was used, the output of single generating unit fluctuated less than oxygen-enriched steam gas per minute as shown in Figure 6. The coefficient of variation of the output of single generating unit was 0.01 (Figure 7).


Gas production strategy of underground coal gasification based on multiple gas sources.

Tianhong D, Zuotang W, Limin Z, Dongdong L - ScientificWorldJournal (2014)

Change of output of the single generating unit after the BFG was used.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4121015&req=5

fig4: Change of output of the single generating unit after the BFG was used.
Mentions: To verify the impacts of adverse factors such as high hydrogen, low calorific value, and fluctuations of both calorific value and gas output and prove the UCG gas production strategy for “multiple-gas-sources” power generation, the research group with which the author works with did field tests about UCG in a mine. See Figure 1 for process flows of the field tests. In the period, the gases generated by gasifying agents of different concentrations were combined with BFG and COG and used in a power generation test done for a 500GF-PWY generating unit produced by Shengli Oil Field Shengli Power Machinery Group Co., Ltd. From 17:00 of September 20 to 17:00 of September 22 in 2010, the air gas produced in UCG was mixed with BFG and used in another power generation test. In the test, the air gas produced in UCG had a calorific value of 4.10 MJ/Nm3 (978.60 kCal/Nm3) only on average and fluctuated greatly (Figure 2): the maximum and minimum calorific values were 4.49 MJ/min and 3.97 MJ/min, respectively; the maximum fluctuation was up to 126.27 kCal/Nm3; the coefficient of variation was 0.05. In addition, the product of calorific value and flow fluctuated greatly too (Figure 3): the maximum and minimum products were 610.98 MJ/min and 539.02 MJ/min, respectively; the maximum fluctuation was up to 71.95 MJ/min; the coefficient of variation was 0.04. However, after the BFG was used, output of the generating unit became stable and reliable in the whole test; see Figure 4. After the BFG was used, the output of single generating unit fluctuated less than calorific value of air gas per minute as shown in Figure 3. The coefficient of variation of single output of the generating unit was 0.02. This also suggests that air can be used as a gasifying agent. From 22:15 of July 30 to 2:00 of August 8 in 2010, a moderately oxygen-enriched steam gas was mixed with COG and used in another power generation test. In the test, the hydrogen concentration of the gas mixture reached 46.19 percent at most and the generating unit ran stably and reliably, suggesting high adaption of the generating unit to a high hydrogen condition. The moderately oxygen-enriched steam gas generated in UCG had a greatly fluctuating calorific value (Figure 5): the maximum and minimum calorific values were 6.45 MJ/min and 7.45 MJ/min, respectively; the maximum fluctuation was up to 126.27 kCal/Nm3; the coefficient of variation was 0.05. In addition, the product of calorific value and flow fluctuated greatly too (Figure 6): the maximum and minimum products were 619.26 MJ/min and 429.07 MJ/min, respectively; the maximum fluctuation was up to 190.20 MJ/min; the coefficient of variation was 0.03. However, after the COG was used, output of the generating unit became stable and reliable in the whole test, as shown in Figure 9. After the COG was used, the output of single generating unit fluctuated less than oxygen-enriched steam gas per minute as shown in Figure 6. The coefficient of variation of the output of single generating unit was 0.01 (Figure 7).

Bottom Line: To lower stability requirement of gas production in UCG (underground coal gasification), create better space and opportunities of development for UCG, an emerging sunrise industry, in its initial stage, and reduce the emission of blast furnace gas, converter gas, and coke oven gas, this paper, for the first time, puts forward a new mode of utilization of multiple gas sources mainly including ground gasifier gas, UCG gas, blast furnace gas, converter gas, and coke oven gas and the new mode was demonstrated by field tests.According to the field tests, the existing power generation technology can fully adapt to situation of high hydrogen, low calorific value, and gas output fluctuation in the gas production in UCG in multiple-gas-sources power generation; there are large fluctuations and air can serve as a gasifying agent; the gas production of UCG in the mode of both power and methanol based on multiple gas sources has a strict requirement for stability.It was demonstrated by the field tests that the fluctuations in gas production in UCG can be well monitored through a quality control chart method.

View Article: PubMed Central - PubMed

Affiliation: School of Mining Technology, China University of Mining and Technology, Jiangsu, Xuzhou 221116, China ; State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, Jiangsu, Xuzhou 221116, China ; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Jiangsu, Xuzhou 221116, China.

ABSTRACT
To lower stability requirement of gas production in UCG (underground coal gasification), create better space and opportunities of development for UCG, an emerging sunrise industry, in its initial stage, and reduce the emission of blast furnace gas, converter gas, and coke oven gas, this paper, for the first time, puts forward a new mode of utilization of multiple gas sources mainly including ground gasifier gas, UCG gas, blast furnace gas, converter gas, and coke oven gas and the new mode was demonstrated by field tests. According to the field tests, the existing power generation technology can fully adapt to situation of high hydrogen, low calorific value, and gas output fluctuation in the gas production in UCG in multiple-gas-sources power generation; there are large fluctuations and air can serve as a gasifying agent; the gas production of UCG in the mode of both power and methanol based on multiple gas sources has a strict requirement for stability. It was demonstrated by the field tests that the fluctuations in gas production in UCG can be well monitored through a quality control chart method.

Show MeSH
Related in: MedlinePlus