Integral gasification combined power generation technology based on pulverized coal air staged pyrolysis and gasification
An air classification, pyrolysis and gasification technology, applied in the field of coal chemical industry, can solve the problems of high air separation energy loss, high failure rate of three-machine linkage, and high investment
Inactive Publication Date: 2016-12-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0008] The purpose of the present invention is to provide an integrated gasification combined power generation process based on pulverized coal air staged pyrolysis gasification in order to overcome the shortcomings of the existing IGCC technology, which not only solves the problems of high investment in the existing IGCC technology, high air separation energy loss, and power transmission It can also be integrated with high-efficiency gas turbines with high initial temperature to simplify the process, greatly improve the overall unit efficiency, reduce the unit KW investment of IGCC power plants, increase the normal operating rate, and reduce the amount of sewage generated
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Embodiment 1
[0021]Example 1, the raw coal is pulverized into coal powder of 0-6 mm through the pulverizer 4, and then enters the middle and lower part of the entrained circulating bed 1 through the pressurized feeding system 3, and is mixed with high-temperature gasification gas and circulating ash. The pulverized coal hydrocracking reaction is carried out under the environment, and a large amount of methane and a little tar are generated, and they flow upward together to form a material cycle; the pyrolysis oil vapor, gasification gas and circulating ash are mixed upward in the entrained bed reactor. Continue to carry out hydropyrolysis of tar to produce methane and light hydrocarbons; go through gas-solid separation at the top of the entrained circulating bed 1, and the high-temperature large and medium-sized carbon-containing hot ash separated by the first-stage gas-solid separator 5 passes through the return device 6 from the return The feed port 9 returns to the bottom of the carrying...
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Abstract
The invention provides an integral gasification combined power generation technology based on pulverized coal air staged pyrolysis and gasification. Smashed pulverized coal is pressurized and input to the middle of a carried circulating fluidized bed and then mixed with high-temperature gasification gas and circulating ash for hydrocracking, and tar hydropyrolysis continues in the mixing and upward lifting process of cracked oil gas, the gasification gas and the circulating ash; by means of gas-solid separation on the top of the carried circulating fluidized bed, first-stage separation carbon-containing ash returns to the bottom of the carried circulating fluidized bed for semicoke gasification reaction, and the gasification gas and high-temperature circulating ash flow upwards to form material circulation; second-stage separation high-temperature fine carbon-containing ash is conveyed into an entrained-flow bed for air gasification reaction to generate high-temperature gas and liquid coal slag, the high-temperature gas and the liquid coal slag enter the carried circulating fluidized bed, and the liquid coal slag is subjected to heat exchange to become solid coal slag; second-stage gas serves as gas, passes through a high-temperature movable bed to remove dust, sulfur, chlorine and heavy metal and then is used for gas turbine power generation and air staged pressurizing, heat of high-temperature flue gas is recycled for generating power through a steam turbine, and a small part of high-temperature circulating ash is subjected to heat exchange and then discharged outwards in the opposite direction through a pressurizing material conveying system.
Description
1. Technical field [0001] The invention provides an integrated gasification combined power generation process based on pulverized coal air staged pyrolysis gasification, which belongs to the field of coal chemical industry. 2. Background technology [0002] The common sense in the field of energy is that coal is cheap but highly polluting energy. Therefore, the development of clean coal utilization technology has always been the goal of the joint efforts of governments and industries around the world. [0003] At present, there are two schools of clean coal power generation technology in China. One is to improve the efficiency of conventional coal-fired units. The main method is to increase the temperature of the main steam and enhance the working capacity. It is an independent Rankine cycle, such as supercritical and ultra-supercritical. The other is IGCC (Integrated Gasification Combined Cycle), that is, the integrated gasification combined cycle power generation system, ...
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IPC IPC(8): C10J3/60C10J3/84C10J3/72F02C6/18F01K23/10
CPCY02E20/14Y02E20/16Y02E20/18Y02P20/129C10J3/60C10J3/721C10J3/84C10J2300/1603C10J2300/1675F01K23/106F02C6/18
Inventor 田原宇乔英云谢克昌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)