Can the idea of a multi-energy complementary compressed air power station come true

Oct 29, 2019   Pageview:1148

As a new direction of energy development, multi-energy complementary integration and optimization is also the development trend of energy reform. In July 2016, the national development and reform commission and the national energy administration stated in the implementation opinions on promoting the construction of multi-energy complementary integration and optimization demonstration projects that a number of state-level integrated terminal energy supply demonstration projects and state-level scenic water and fire storage multi-energy complementary demonstration projects will be completed during the 13th five-year plan period. In October this year, the national energy administration issued the guideline on promoting the development of energy storage industry and technology again, which is the first guiding policy for the development of large-scale energy storage technology and its application in China, further deepening and improving the energy development mode of multi-energy complementary integration and optimization + energy storage.

Advantages of showing

At present, the domestic representative of a batch of pluripotent complementary and integrated optimization of demonstration projects are under construction, such as energy consumption terminal electric heating air conditioning integrated multi-functional complementary demonstration project, including the future of science and technology in wuhan city can complementary demonstration project, hefei airport demonstration zone can complementary demonstration project and Qingdao chinese-german eco-park pluripotent complementary demonstration project, etc.; It is a large-scale comprehensive energy base, including ningxia jiaze new energy smart micro grid project (put into operation) and qinghai longyangxia water and light complementary project (put into operation). Its advantages in energy efficient utilization have already appeared.

Abroad, solar energy is widely used in combination with other energy sources in Europe. For example, Denmark mainly adopts the combined application of solar energy and biomass energy, which is strongly supported by the Danish government. In addition, Sweden has rich experience in the combination of solar energy and biomass energy. One way to heat homes in Germany is to use solar and gas systems that complement each other.

In addition to the above can complement each other, using the main renewable energy can complement + production of electricity, compressed air energy storage will be a completely in the sense of clean green energy, are also housed in the complementary aspects of a key area, recently authorized by the national Patent Office "a wave power, wind energy, solar energy power plant" has made the beneficial exploration for it.

Design key points

Shoreline zone is the concentrated area of wave energy, wind energy and solar energy. It has unique advantages of natural renewable energy location, and opens up infinite imagination space for the three natural energy sources to complement each other and to utilize energy storage. The principle and main components of wave energy, wind energy and solar energy multi-energy complementary compressed air energy storage power station include wave energy, wind energy, solar energy and heat exchanger, compressed air energy storage, turbine generator and control system.

Part of wave energy is through the buoyancy and wave propagation principle of sea water. The method of floating capture wave energy at sea surface point is adopted. In coastal coastal areas (4m -- 7m is optional for sea depth), a frame group is set up and fixed at sea bottom. The cylinder and collecting pipe are fixed on the part above the sea surface of the frame. The cylinder is arranged in the center of the frame. The buoy is connected with the cylinder through the connecting rod (the connecting rod is connected with the piston inside the cylinder). The upper part of the cylinder is provided with an outlet one-way valve communicated with a collecting pipe, and an intake one-way valve communicated with the external atmosphere. As the waves rise and fall, the buoy moves vertically up and down, and the waves rise from the trough to the peak. The buoy is subject to the rise of the sea buoyancy, and the air pressure in the cylinder increases. Waves from the peak to the trough of the decline stage, because the buoy has a certain quality, drive the connecting rod, piston down, the air pressure value in the cylinder down, the cylinder outlet check valve closed, the inlet check valve opened, the outside atmosphere into the cylinder, for the next compression ready; As the cycle continues, the outer atmosphere is compressed into the manifold.

Wind part, the fan can be divided into wind turbines with horizontal axis and vertical axis wind turbines, according to the characteristics of the power station, appropriate USES vertical axis wind turbines, by natural wind blowing wind turbine blades rotate, fan shaft rotates, vertical torque by a pair of bevel gear connected to the level of the air compressor shaft arrangement, air compressor to compress the outside air, compressed air into the trachea. There are many forms of air compressor, mainly including piston reciprocating, blade type, double-screw and other forms, double-screw air compressor due to its stable output pressure, long life and other characteristics, can be used as the first choice of power station.

In the solar energy part, the heat transfer medium (heat conduction oil) in the solar energy collection tube is heated through the trough solar energy collection tube system, and the heat transfer medium is heated through the heat exchanger to heat the compressed air in front of the turbine which is fed into the collection tube, so that the compressed air is further expanded and then sprayed into the turbine.

Compressed air energy storage, the system set in the compressed air storage tank, mainly for the mild wind and the waves is lower case, by the wind and waves can provide compressed air flow is insufficient, have the effect of supplement of compressed air, to ensure that in a certain time into the turbine set flow rate and pressure of compressed air, to ensure the stability of the power output and sustained. That buys time for the next period when winds and waves pick up and normalize, and refill the accumulator. In addition, the collector pipe in the power station plays a role of energy storage and flow stabilization for compressed air due to its long pipeline and large volume. In order to increase the storage of compressed air in the gas storage tank, a multistage compressor can be installed in the pipeline before entering the gas storage tank, and the compressed air can be multistage compressed by using the power generated by itself, so as to obtain a higher pressure value and store it. At the same time, the structural strength should be fully considered in the design of power station to resist the influence of severe weather such as typhoon.

What are the advantages of compressed air energy storage power stations with wave energy, wind energy and solar energy? First of all, its principle, structure and equipment is simple, without any complex precision equipment, reduce engineering cost, low power cost. Secondly, the wide range and large amount of energy collection make the energy more stable and facilitate the large-scale production of electricity, which solves the problems of single wind power generation, solar photovoltaic power generation output power fluctuation, discontinuity and output power cannot be controlled with the change of load. Third, the long coastline is suitable for many power station construction sites, and can be used as a distributed energy system for offshore islands, which can further realize the triple generation of cold, heat and electricity. Fourth, the whole process without any pollution, so that the clean green environment-friendly.

potential

China is a big ocean country, with a coastline of more than 18,000 kilometers. In particular, the narrow pipe effect formed in the Taiwan strait makes the southeast coast the best region for China's wind energy resources. Wind energy also forms large waves, providing excellent natural conditions for the construction of power stations. At the same time, the coastal areas have developed economy, huge power consumption, perfect power grid system and the construction of multi-energy complementary power station, which can supplement the power supply of coastal cities and replace part of coal power. It has great practical significance for environmental protection and has broad commercial prospects and social benefits.

The power station has great potential to be promoted to the world. On the earth's surface, the ocean area accounts for 71% of the whole earth's surface area, and the land area accounts for 29% of the total area. The vast ocean and endless coastline lay a foundation for the promotion of the power station in the world. Foreign countries have long explored the field of renewable energy power generation, but there are few theoretical or experimental reports on wave energy, wind energy and solar energy combined power generation. If the power station succeeds, it will become a major project for China to go global after deep diving, high-speed railway and combustible ice mining, and win global benefits.

Wave energy, wind energy, solar energy can complementary and compressed air energy storage power station, is a pure sense of the word can complementary and integrated optimization using renewable energy in the production of electric power solutions, a perfect interpretation of pluripotent complementary and integrated optimization + the concept of energy storage, for our country and the world from fossil fuels to renewable energy transformation, will produce a far-reaching impact.

The page contains the contents of the machine translation.

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