Method for pulverized coal gasification under near normal pressure
A technology for coal gasification and powder pressing, applied in the field of coal gasification technology, can solve the problems of difficult control, high investment and large floor space, and achieve the effects of easy operation and control, high safety performance and small floor space
Inactive Publication Date: 2010-03-03
HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD +1
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Problems solved by technology
The former is famous for its environmental protection, but it has high investment, high operating pressure, difficult control, and low safety performance; the latter is famous for its low investment and quick results, but it occupies a large area and pollutes the environment, which has been clearly stipulated in the country. obsolete craft
[0003] Fertilizer companies generally use heavy oil gasification and the above-mentioned gasification process for gas production. However, due to the high price of heavy oil, the production cost has increased. Therefore, many companies have converted the heavy oil gasification process to SHELL pulverized coal gasification process, and have also eliminated heavy oil gasification. furnace
It's a waste of resources
SHELL's medium-pressure pulverized coal gas generation is specially designed with an air separation section for the original heavy oil gas generation, while most synthetic ammonia manufacturers do not have an air separation unit for coal gas generation
Method used
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[0017] Depend on figure 1 , the coal is sent to the coal gasification system by a belt, heated to 100°C after being pulverized and dried, then sent to the gasifier 1 through the siphon coal feeding device 4, and the air at 30KPa from the air fan through the air inlet pipe 5 is heated by steam to 100°C; the medium-pressure steam from the main steam pipe 3 first enters the jacket of the gasification furnace to heat the gasification furnace 1, and then merges into the low-pressure steam pipe 2. After decompression to 30KPa, it is combined with the gas from the top of the gasification furnace The low-pressure steam is heated to 200°C through the heat exchanger 6; the air at 100°C is the same as the steam at 200°C, and a certain proportion of pulverized coal is absorbed into the gas generator 1 through the siphon coal feeding device 4, and the pressure is controlled at 4~ 7KPa, the temperature is 1000°C, the synthesis gas reaction is carried out, and the residual slag after the rea...
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The invention discloses a method for pulverized coal gasification under the near normal pressure and relates to a pulverized coal gasification process. The raw material (heavy oil) used for a heavy oil gasifier is changed into pulverized coal, and the pulverized coal is gasified under the near normal pressure, a set of siphon coal feeders is additionally arranged on the gasifier, a set of water seal continuous slag discharging devices is additionally arranged below the gasifier, and a heat exchanger is additionally arranged at the top part of the gasifier. The provided method for pulverized coal gasification under the near normal pressure is a new process which can realize the continuous gasification of the pulverized coal and the continuous slag discharge only by additionally arranging asmall number of devices on the gasifier; compared with the existing SHELL gas-generating furnace, the gasifier has the advantages of saved investment, easy control, simple operation, high security andfast effect; and compared with the existing briquette gas-manufacturing process, the method has the advantages of saved investment, small occupied area, easy operation and control and environmental protection.
Description
technical field [0001] The invention relates to a coal gasification process, in particular to a pulverized coal gasification method near atmospheric pressure. Background technique [0002] The currently adopted coal gasification technologies are mainly SHELL pulverized coal gasification and coal briquette gasification technologies. The former is famous for its environmental protection, but it has high investment, high operating pressure, difficult control, and low safety performance; the latter is famous for its low investment and quick results, but it occupies a large area and pollutes the environment, which has been clearly stipulated in the country. Eliminated craftsmanship. [0003] Fertilizer companies generally use heavy oil gasification and the above-mentioned gasification process for gas production. However, due to the high price of heavy oil, the production cost has increased. Therefore, many companies have converted the heavy oil gasification process to SHELL pulv...
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IPC IPC(8): C10J3/46C10J3/86C10J3/84C10J3/52
CPCY02E20/18Y02P20/129
Inventor 蒋远华杨晓勤马建新何涛刘晓刘裕
Owner HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD