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Kelin Yuan College - What is CCHP?Kelin Yuan College CCHP 燃气冷热电三联供 Combine Cooling Heating & Power  Historical tracing: The prototype of the combined cooling, heating, and power system can be traced back to the concept of "distributed energy supply system" proposed in the United States' Public Utility Management Reform Act in 1978. Afterwards, the energy supply system was promoted in the United States and subsequently accepted by other developed countries. Overview: The emergence of CCHP is in line with the transformation of the environment and energy supply methods. In developed countries, energy supply was previously dispersed, followed by centralized supply and now decentralized supply. Previously, the bottlenecks in domestic triple power generation were mainly gas prices and power output methods. In the joint release of the "Guiding Opinions on the Development of Natural Gas Distributed Energy" by the National Development and Reform Commission, the Ministry of Finance, the Ministry of Housing and Urban Rural Development, and the National Energy Administration, the central government provides appropriate support for the development of natural gas distributed energy, and provides certain investment rewards or discounts for natural gas distributed energy projects. Relevant projects can enjoy tax preferential policies. With the support of mechanisms such as "financial and tax support", "grid connection", and "demonstration projects", the cost of using gas has gradually decreased.   Practical application scenarios Shanghai Pudong International Airport  concept What is "Gas Cooled Thermal Power Triple Supply"?  Concept analysis: Natural gas combined cooling, heating, and power supply. It is an energy supply system that uses gas as a primary energy source, generates hot water and high-temperature exhaust gas after power generation, and utilizes them to meet the cold, hot, and electrical needs of service objects under the same time and space conditions. As shown in the figure, the triple supply of cold and hot gas uses natural gas as the main fuel to drive the operation of gas turbines, gas internal combustion engines, micro combustion engines, and other gas power generation equipment to generate electricity. The "waste heat recovery equipment" is used to continue using the waste heat generated by the power generation to serve the target, providing heating and cooling throughout the entire process. Schematic diagram of CCHP key equipment: The working form of the triple supply system: Natural gas enters the generator set for power generation, and the generated flue gas and cylinder liner cooling water provide heat and cooling capacity through heat exchange, heat recovery, and refrigeration equipment.  expand   Cold, heat, and power cogeneration is a type of distributed energy, and "Distributed Energy Resources" refer to energy comprehensive utilization systems distributed at the user end. Primary energy is mainly gas fuel; The secondary energy mainly relies on the cogeneration of heat, electricity, and cooling distributed at the user end, supplemented by other energy supply systems, to achieve energy cascade utilization that directly meets the various needs of users The stepped utilization of energy can reduce the transmission loss of cooling, heating and power, and reduce the imbalance loss of the pipeline network. Meaning benefit What are the environmental significance and economic benefits?   Advantages of natural gas triple supply compared to traditional coal-fired power: Compared to traditional centralized energy systems: Natural gas distributed energy has the advantages of high utilization rate, significant emission reduction effect, optimized energy structure, and high energy supply security. Economic benefits: Realizing the cascade utilization of energy has comprehensive benefits such as saving energy, improving the environment, and increasing power supply; Provide grid connected power as a backup and complementary power source for the backbone power grid; By fully utilizing the thermal energy of natural gas, the comprehensive energy utilization efficiency of the system can reach over 90%. On the basis of paying the same natural gas cost, obtaining electricity and heat prices as two sources of income increases the overall revenue of system operation, resulting in a corresponding increase in the economic benefits and efficiency of the entire system. Reality and Future Expert advice and future prospects   Expert advice: It is necessary to combine the cold, heat, and power cogeneration system with facilities with stable electricity demand to form an energy integration system and improve the economy and operational stability of the system. Future outlook points: 1. Improve the comprehensive utilization rate of energy and improve air quality. 2. Optimizing energy structure, achieving dual peak shaving and valley filling in gas and electricity, is the best choice for large-scale replacement of coal. 3. Ensure energy security. There is a basic pattern of reverse distribution between China's energy resources and demand. The cascade utilization of thermal energy for heating and cooling can further improve the safety of energy supply. 4. Couple renewable energy and promote the development of smart energy. The natural gas distributed energy source is easy to start and stop, flexible in operation and regulation, and coupled with renewable energy can effectively solve the problem of unstable renewable energy.   部分图文转自洛小灏 Follow us as we make the green economy more possible |
