Talking about IGCC Type Clean Coal Power Generation Technology

Abstract: Talking about the technical information of IGCC type clean coal power generation is provided by excellent flowmeter and flowmeter manufacturers. Abstract: With the development of energy technology and environmental protection technology, IGCC type clean coal power generation technology will develop in my country. This paper analyzes the basic principle of integrated coal gasification gas-steam combined cycle, and introduces coal gasification, purification equipment and technology. all. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on IGCC clean coal power generation technology. With the development of energy technology and environmental protection technology, IGCC type clean coal power generation technology will develop in my country. This paper analyzes the basic principle of integrated coal gasification gas-steam combined cycle, and introduces coal gasification, purification equipment and technology. Integrated coal gasification gas—Steam Combined Cycle (IGCC) is a clean coal power generation technology that was studied during the oil crisis in Western countries in the 1970s. Its technical concept and line are very clear, that is: coal is gasified in a gasifier to become medium heat. The ash, sulfur compounds and other harmful substances in the crude gas are removed by treatment, and then supplied to the coal gasification combined cycle for combustion and work, so as to achieve the purpose of replacing oil with coal. In this way, the desire to burn solid fuel coal in the coal gasification cycle with high power supply efficiency can be indirectly realized. In this technology, gas turbines, waste heat boilers and steam turbines are all conventional mature technologies, and the main differences are coal gasification and crude gas purification equipment. It is hoped that this technology can not only improve the power supply efficiency of coal-fired power plants, but also solve the problem of environmental pollution caused by burning coal. 1 Technical principle Coal gasification. It means that the properly treated coal is sent to the gasifier, and at a certain temperature and pressure, through the addition of a gasification agent, it flows in a certain method and is converted into fuel gas, that is, coal gas. The gasification of coal mainly produces CO and H2, and gaseous sulfur and nitrogen are removed by a gas purification unit before combustion. The hydrogen sulfide in the crude gas can be removed by chemical absorption or physical adsorption after the gas is cooled. These purification processes remove 90% of the sulfur. In addition, limestone can also be added to fix sulfur in the gasification process, which can desulfurize 90%. Nitrogen in the gas can be easily removed, and the formed ammonia can be recycled. 2. Gasification device used in IGCC 2.1 Coal gasification device Coal gasification device is divided into three types: fixed bed gasifier, fluidized bed gasifier and spouted bed gasifier. Integrated coal gasification gas—The requirements of the steam combined cycle for the gasifier are: a. Practicality of equipment: It is required that the gasifier has fewer processing procedures, work reliability and equipment availability, the production capacity of a single furnace is large, the maintenance is convenient, and the manufacturing and maintenance costs of the equipment are low. b. The adaptability of raw materials: it is required that the gasifier can add various kinds of coal, including coking coal, and can use other raw materials such as reuse and petroleum coke instead. c. Simplicity of the coal gasification treatment system: It is required that the gas produced by the gasifier does not contain harmful substances such as by-product tar and phenols, and the carrying amount of coal dust should also be small, so that the gas purification system can be simplified. d. Matching with the operating conditions of power generation equipment: The gasifier is required to have the ability to adapt to changing loads. It can be quickly shut down and restarted quickly. 2.2 Gasifier performance in IGCC Comparison of gasifiers in IGCC (see Table 1, Table 2). 3 The gas turbine used in the IGCC can use the single-shaft gas turbine as the prime mover of the power generation equipment in the combined cycle of the IGCC. At present, the gas turbine for power generation has been developed relatively maturely. However, since it must be organically combined with the IGCC process to form a whole, and directly change to burning gas, the existing gas turbine must be properly transformed to adapt to the work of IGCC. need. Due to the difference in the connection relationship between the gas turbine and the air separation system in the IGCC system, as well as the different types of synthetic gas used, the transformation content of the gas turbine is also different. The following is a brief introduction to the example of gas turbine burning medium calorific value gas. When the coal gasifier provides medium calorific value gas to the gas turbine, the compressor and gas turbine in the gas turbine do not need to be technically modified, and the combustion chamber of the gas turbine needs to be properly modified. On the one hand, it is to meet the requirements of medium calorific value gas combustion characteristics, and on the other hand, it is to meet the requirements of reducing NOx emissions in exhaust gas. Practice shows that when the gas turbine that originally used natural gas is changed to medium calorific value gas, the main geometric dimensions of the combustion chamber, such as the diameter and length of the flame tube, do not need to be changed, but the size of the gas nozzle and gas supply pipeline needs to be changed. At this time, the air distribution in the primary combustion zone of the flame tube changes very little, so that the overall size of the combustion chamber does not need to be changed significantly. In order to reduce the NOx emission during the combustion process, ① a gas saturator can be added in front of the combustion chamber. This is a measure to inject a certain amount of water into the gas to make the water vapor in the gas saturated, so as to control the temperature of the combustion zone below 1650 °C to prevent NOX from being generated. ② take“Staged combustion”Retrofit the combustion chamber into a new type of combustion chamber with low NOx emissions. 4. Gas purification technology Gas purification is divided into two categories: normal temperature (less than 400 ℃) and high temperature purification.

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