The combination of coal and electricity, ie, integrated gasification combined cycle power (IGCC), is a clean coal power generation technology that is currently respected in the world. It has been commercialized in foreign countries, but only the industrial experimental device of the Yantai Power Plant in China was put into use in April of this year. In China, there are still deficiencies in single technologies such as coal gasification and syngas combustion chambers. As for chemical and electrical integration, chemical companies are often considered from the perspective of combined heat and power generation and waste heat utilization. Power generation is in an auxiliary position and technology is mature. The implementation of the polygeneration technology of Yankuang Group is an organic combination of IGCC and chemical industry. The coal gasification polygeneration system uses coal as raw material, gasifies coal to produce synthesis gas with CO and H2 as the main components, removes impurities such as sulfur in the synthesis gas, and clean synthesis gas is used in the combined gas cycle Power generation and as a chemical raw material.
This system is not only the first in China, but also the first in the world. The development concept is unique and novel. On the one hand, the co-production system has abandoned the original scientific research of coal conversion and utilization and the application of coal in the industrial sector as a single substance, and pursues a high conversion rate in a single process. One-sided pursuit of local optimization, while emphasizing the overall optimal. On the other hand, the coal co-production system organically integrates coal gasification technology, combined cycle power generation technology, combustion and pollutant control technologies, and chemical product dynamic deployment technology to promote theoretical and experimental research in the above-mentioned fields, and in particular to promote the use of hydrogen energy. And research to reduce CO2 emissions.
Due to the fact that polygeneration systems make up for the inefficiency of new technologies for clean coal units that are being developed and are difficult to meet at the same time with deficiencies in efficiency, cost, and environmental protection, a new way of seeking global optimization under local constraints is proposed for the development of cell technology. And new directions. Specific features include: First, it has the greatest potential for improving power supply efficiency. The power supply efficiency of IGCC can reach 42% to 45% (calculated as low calorific value), and it may reach 60% in the future. This is very attractive to companies that urgently need to improve the efficiency of thermal power plants in China. Second, the single-phase capacity of gas-fired power generation has been able to achieve 300M ~ 400MW level, easy to achieve economies of scale, we can adapt to China's high power units to meet the requirements of a substantial increase in installed capacity. Third, the most thorough solution to the pollution problem is particularly suitable for high-sulfur coals and can meet the increasingly stringent environmental protection standards of the world and the country. It also helps reduce CO2 emissions.
The most significant function of coal gasification polygeneration system is to optimize the energy cascade utilization and material balance of the entire system, and to flexibly adjust the quantity and nature of products according to the market demand of products. For example, the gasified feed gas is used to produce methanol, while the purge gas and part of the feed gas discharged during the production of methanol (including acetic acid, urea, etc. in the future) are used for combined cycle power generation and supply the power needed in the production process. And steam; polygeneration system can also be based on changes in the methanol market demand and power grid peaks and valleys in a timely manner for power generation adjustments.
At present, a number of domestic coal and chemical companies are preparing to establish a new coal gasification polygeneration system, especially the development of coal to replace liquid fuels is very strong. It can be foreseen that the coal gasification polygeneration system is the most effective way to use clean coal, and is an important part of China's sustainable energy system.
Where are the advantages of coal gasification and polygeneration?
On May 30th, the R&D and demonstration projects of key technologies for coal gasification power generation and methanol co-production systems jointly undertaken by Yankuang Group and East China University of Science and Technology were accepted by experts. The significance of this topic lies not only in the realization of the first organic integration of coal, electricity, and chemical cogeneration systems in China, but also more importantly, it provides new ideas and directions for the development of coal chemical industry in the future.