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A method for producing natural gas from coal gasification
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A coal gasification and coal gas technology, which is applied in gas fuel, petroleum industry, fuel and other directions to achieve the effect of reducing production load and equipment investment pressure, clean and efficient utilization, and saving a lot of water
Inactive Publication Date: 2014-10-29
CHINA NAT OFFSHORE OIL CORP +1
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[0005] It can be seen that choosing the crushed coal pressurized gasification scheme is beneficial to obtain methane products, but when choosing the crushed coal pressurized gasification scheme for coal-to-natural gas, it is necessary to solve the problem of the utilization of waste water generated by gas water treatment
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Embodiment 1
[0064] This embodiment is used to illustrate the method for producing natural gas by gasifying crushed coal of the present invention.
[0065] according to figure 1 The method shown is for coal-to-gas production.
[0066] Oxygen (purity: 99.6%) is obtained through the air separation unit 5.
[0067] 1) Crushed coal gasification unit. Lignite with a particle size of 10-40mm, water vapor and the obtained oxygen are fed into the Lurgi MARK-IV furnace, and the crushed coal is pressurized and gasified under the conditions of gasification pressure of 3.0MPa and gasification temperature of 900-1150°C . The raw gas produced by the gasification reaction is sent to the first water washing device 11 for water washing to obtain the first gas and gas water. The gas water is sent to the gas water treatment unit 3 for gas water treatment, and part of the waste water generated by the treatment is sent to the coal water slurry gasification device 20 . After the first gas is sequentially s...
Embodiment 2
[0073] According to the method of Example 1, the difference is that the weight ratio of lignite (crushed coal) to bituminous coal (powdered coal) is 1:1.
[0074] Production 4 billion m 3 When there is methane, the amount of wastewater produced by the crushed coal gasification unit 1 is 375t / h, of which the amount of wastewater entering the coal-water slurry gasification unit 2 is 200t / h, and the amount of wastewater discharged is 175t / h.
[0075] The content of monohydric phenol in wastewater is 100mg / L, the content of polyphenol is 300mg / L, and the content of ammonia nitrogen is 200mg / L.
[0076] After cost accounting, the cost of producing methane is 0.948 yuan / m 3 .
Embodiment 3
[0078] According to the method of Example 1, the difference is that the weight ratio of lignite (crushed coal) to bituminous coal (powdered coal) is 2:1.
[0079] Production 4 billion m 3 When there is methane, the amount of wastewater produced by the crushed coal gasification unit 1 is 450t / h, of which the amount of wastewater entering the coal-water slurry gasification unit 2 is 230t / h, and the amount of wastewater discharged is 220t / h.
[0080] The content of monohydric phenol in wastewater is 100mg / L, the content of polyphenol is 300mg / L, and the content of ammonia nitrogen is 200mg / L.
[0081] After cost accounting, the cost of producing methane is 0.922 yuan / m 3 .
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Abstract
The invention discloses a method for preparing natural gas by coal gasification. The method comprises the following steps: feeding crushed coal into a crushed coal gasifying device for crushing, and pressure gasification to obtain coarse coal gas; feeding the coarse coal gas into a first water washing device to wash to obtain first coal gas and gas liquor; feeding the gas liquor to a gas liquor treatment unit for gas liquor treatment to obtain wastewater; feeding the wastewater and pulverized coal to the coal gasifying device for coal gasification to obtain second coal gas; and feeding the first and second coal gases respectively or jointly to a methanation device for methanation to prepare a methanation product. The coal gasifying device is the coal gasifying device except the crushed coal gasifying device, and coal gasification means coal gasification except pressure gasification of crushed coal. According to the method, wastewater is reasonably utilized, and coal is more cleanly and efficiently utilized, and the production cost of methane is lowered.
Description
technical field [0001] The invention relates to a method for producing natural gas from coal gasification. Background technique [0002] Coal-to-natural gas is the gasification of coal to produce methane. At present, most coal-to-natural gas projects adopt a single gasification scheme. The gasification schemes that can be selected include crushed coal pressurized gasification, coal water slurry gasification and pulverized coal gasification. This is due to the high content of methane gas in the coal gas produced by the crushed coal pressurized gasification scheme, which is beneficial to methane production. Moreover, this scheme also has the characteristics of small investment, small land occupation, and simple operation and control, and has become the preferred gasification scheme for most domestic enterprises to carry out coal-to-natural gas projects. Although adopting the crushed coal pressurized gasification scheme has the above-mentioned advantages, a large amount of h...
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