Kou Jianyu: incremental space for new market of concentrated solar energy

Under the background of comprehensive energy, where is the development space of concentrating solar energy industry? How to develop? Recently, Kou Jianyu, vice chairman of the solar thermal industry technology innovation strategic alliance, a survey and design master in the power industry and deputy chief engineer of Inner Mongolia Electric Power Survey and Design Institute Co., Ltd., introduced this. From the technical advantages of solar thermal power generation, she analyzed its role in multi energy complementary and comprehensive energy "The integrated energy system with heat energy as the center is the new market increment space of concentrated solar energy, and the concentrated solar system with energy storage is itself an integrated energy system. All units in the solar thermal power generation industry chain can actively plan integrated energy projects with heat energy as the center and strive to expand the market increment space.

Solar thermal power generation technology can be divided into line focusing and point focusing. Line focusing mainly includes slot type and Fresnel type, and point focusing mainly includes tower type and dish type.

The concentrating ratio of trough solar thermal power generation technology is 10 ~ 70, which is suitable for high / medium temperature and medium voltage; It is a technical route with many commercial operation projects at present, and operation experience can be learned. The condensing ratio of Fresnel solar thermal power generation technology is 3 ~ 50, which is suitable for high / medium temperature and medium voltage; On June 19 this year, the world molten salt linear Fresnel solar thermal power generation commercial project - Lanzhou Dacheng Dunhuang 50MW optical thermal power station was officially put into commercial operation, and there is also a technical route to learn operation experience.

The tower type can reach 300 ~ 1500, which is suitable for high temperature and ultra-high pressure; At present, there are many commercial operation projects and operation experience can be learned. The concentrating ratio of dish solar thermal power generation technology is between 1000 ~ 4000. Stirling cycle is mostly adopted. There are commercial operation projects and operation experience can be learned.

From the technical route, the advantages of solar thermal power generation technology are obvious: first, it can be equipped with large-scale, low-cost and high-efficiency energy storage system; Second, it can realize continuous 24-hour uninterrupted power generation by equipped with an appropriate scale energy storage system; Third, it can partially replace conventional thermal power as base load power supply; Fourth, the impact on the power grid is small, which meets the requirements of building a green smart grid.

The multi energy complementary system realizes the cascade utilization of energy and improves the comprehensive utilization level of energy through multi energy coordination, optimization and complementarity. So, how can concentrated solar energy deeply participate in multi energy complementary system? There are mainly the following ways:

In addition, concentrated solar energy can also form a multi energy complementary system with biomass, garbage, geothermal and other power generation forms.

In June 2014, the sixth meeting of the financial and economic leading group focused on the strategy of energy security. General Secretary Xi Jinping put forward the "revolution" to promote energy consumption, energy supply, energy technology and energy system in four aspects.

The NDRC, the Energy Bureau and the Ministry of industry jointly issued the "guiding opinions on promoting the development of" Internet plus "smart energy. The concept and strategy of energy Internet were put forward. Through Internet technology, the comprehensive energy system's multiple energy complementarity, multi system coordination and optimization, and the business mode innovation of energy market were realized, and the strategic goal of energy transformation was realized.

"Driven by the energy innovation and development strategy and the Internet and Internet of things technologies, integrated energy technology came into being." Kou Jian said that integrated energy system refers to the integration of coal, oil, natural gas, electric energy, thermal energy and other energy in a certain region by using advanced physical information technology and innovative management mode, Realize the coordinated planning, optimized operation, collaborative management, interactive response and mutual assistance among various heterogeneous energy subsystems. It is a new integrated energy system that can effectively improve energy efficiency and promote sustainable energy development while meeting the diversified energy demand in the system.

The integrated energy system is mainly composed of energy supply network (such as CCHP units, generator sets, boilers, air conditioners, heat pumps, etc.) (source side), energy exchange links (such as power supply, gas supply, cooling / heat supply and other networks) (network side), energy storage links (storage side) (power storage, gas storage, heat storage, cold storage, etc.) and a large number of end users (load side).

At present, integrated energy service is still in the initial development stage in China. The two major power grids and major power companies are the main participants in the integrated energy service market. The 2019-2020 action plan for promoting the development of comprehensive energy service business issued by the power grid clearly adheres to electricity as the center and multi energy mutual assistance, and takes promoting energy Internet and intelligent energy use as the development direction. "In the development of power centered projects, all units in the solar thermal power generation industry chain can actively participate in the tide of comprehensive energy services at the planning stage and strive for the market share of energy supply (source side) and energy storage (storage side) with the advantage of concentrating solar energy." Kou Jianyu said and further analyzed:
(1) Under the existing power load and energy supply mode, through transformation to meet the various energy needs of users; Such as using solar energy for combined heating or cooling to make up for the energy supply gap under the existing mode;
(2) The source grid load storage under the microgrid mode in the park is a promising field of solar thermal power generation. The Erlianhot renewable energy base project undertaken by Inner Mongolia Institute is a good example; The vast northern region can not only meet the requirements of solar energy resources and land for solar thermal power generation projects, but also the unique energy storage mode of solar thermal power generation is conducive to the balanced energy supply of the power grid.

"The integrated energy system centered on thermal energy is a new market increment space for concentrated solar energy." she concluded that according to incomplete statistics, thermal energy accounts for 50% and electric energy accounts for 25% of terminal energy; In metallurgy, papermaking, chemical industry, food, medicine and other industries, the thermal power consumption ratio is even greater than 3, that is, to build a market space for comprehensive energy projects centered on thermal energy. The concentrated solar energy system with energy storage is an integrated energy system. All units in the solar thermal power generation industry chain can actively plan comprehensive energy projects centered on thermal energy and strive to expand the market increment space.