At present, China's energy structure is in the dual replacement period of oil and gas instead of coal and non-fossil energy to replace fossil energy. However, because renewable energy such as solar energy and wind energy are affected by resources, technology, and geography, it is difficult to achieve large-scale replacement in the short term. Natural gas, as a low-carbon fossil energy source, is a strategic choice for energy transformation.
Energy coupling complements each other
Natural gas distributed energy and renewable energy have a large space for coordinated development
During the "Thirteenth Five-Year Plan" period, natural gas has become an important and realistic hand of China's energy transformation. As an important measure in the reform of the natural gas field, the opportunities and challenges in the development of natural gas distributed energy have always complemented each other. As early as the 2017 China International Natural Gas Distributed Energy Industry Summit Forum, many experts gave their views on their development status and future trends.
The total installed capacity of natural gas distributed energy exceeds 11.12 million kilowatts
The data shows that as of the end of 2015, China's natural gas distributed energy projects (single-scale scale less than or equal to 50 megawatts, total installed capacity of less than 200 megawatts) totaled 288, with a total installed capacity of more than 11.12 million kilowatts, mainly concentrated in the eastern economically developed regions. Due to the high natural gas prices in the past two years, the economics of natural gas distributed energy has been greatly reduced. Most of the distributed energy projects that have been built have been operating normally, and certain economic, social and environmental benefits have been achieved. Some projects have been connected to the grid due to their benefits. Or technical issues are at a standstill. At the end of 2015, as China's natural gas price was lowered by 0.7 yuan/m3, the road of natural gas system reform was opened, which provided a new development opportunity for natural gas distributed energy, and the natural gas distributed energy market began to gradually recover.
According to Li Jingru, director of the Science and Technology Department of the State Grid Beijing Institute of Economics and Technology, in the past two years, natural gas distributed energy construction has gradually entered the stage of substantive development and application. There have been dozens of natural gas distributed energy engineering investments in major cities such as Beijing and Shanghai. run. “At present, China's natural gas distributed energy is mainly composed of natural gas combined heat and power. Compared with traditional thermal power units and combined heat and power, natural gas combined heat and power can meet multiple energy needs and achieve multiple functional goals. To achieve integration of refrigeration, heating and power generation processes, and to fully improve the efficiency of comprehensive energy utilization, the comprehensive energy utilization rate of multi-joint systems that fully meet the requirements of cold and heat power can generally reach more than 75%." Li Jingru said.
Facing the rapid development of the industrial situation, Li Jingru said that it should formulate a scientific price system, explore the operating model to promote the healthy development of the industry, and encourage universities, equipment manufacturers and professional research institutions to strengthen communication and cooperation with energy companies, and give full play to the distributed energy system. Resource allocation function; strengthen the planning and design of natural gas multi-joint projects, plan all types of distributed energy layout in the area, coordinate load and resources, optimize system configuration; improve design and operation standards, strengthen related technology research and results promotion, and improve natural gas The operational control level of multi-joint projects has actively promoted the practical and commercialization of results.
Combined with renewable energy, the comprehensive rate can reach more than 80%
At present, China's natural gas distributed energy has entered a stage of rapid development. It is predicted that the installed capacity of natural gas power generation will reach 110 million kilowatts in 2020, accounting for more than 5% of the total installed capacity of power generation.
Xu Xiaodong, special researcher of the State Council Counselor and director of the Distributed Energy Special Committee of the China City Gas Association, said that China's energy and power still face the problem of overcapacity. Therefore, the problem of the consumption of natural gas distributed energy and power output needs to be solved. Not only that, but related equipment and technology are also not competitive. At the same time, he pointed out that as the industry continues to develop and the state's fiscal pressures increase, there is a high possibility of future subsidies. Therefore, companies should seek a variety of business operations models such as PPP to achieve sustainable development.
Li Xianrui, a researcher at the China Academy of Building Research, believes that to achieve the goal of 10% of total energy consumption and 15% of renewable energy by 2020, it is inseparable from the synergy between natural gas distributed energy and renewable energy. development of. Renewable energy has the characteristics of intermittent and discontinuous. It may cause power impact on the power grid during power generation, affecting the quality of users' electricity consumption, and natural gas distributed energy also has shortcomings such as high investment and high operating cost. After coupling natural gas distributed energy and renewable energy, we can learn from each other's problems, such as high distributed energy investment and high operating costs, and reduce energy costs. It is also conducive to turning unstable energy into stable energy and digesting instability in the microgrid. Li Xianrui said: "The evaluation index system of distributed energy is that the comprehensive utilization rate is greater than 70%, and the comprehensive utilization rate after coupling can reach 80%, 90%, or even 100%. At the same time, the combination of the two can be with the Internet, Micronet compatible."