New energy special device gathers solar energy innovation and causes a sensation in the industry

More than 30 years ago, the tower solar thermal power generation system brought good news to the world's energy problem. However, due to the high cost and low efficiency of solar cells, it has become a major problem that restricts its popularization. Today, inventor He Kaihao has launched a patented achievement with important contribution value - "the focusing aiming device of the tower solar thermal power generation system". This device has a simple structure, is easy to operate, and has extremely low cost. It not only solves the problems that have plagued the industry for many years, but also brings new opportunities to open up new energy channels and expand and strengthen the solar energy industry.

How to deal with the current resource and environmental tension is a hot topic of global concern. At the end of last year, environmental ministers and other officials from 192 countries held the United Nations Climate Conference in Copenhagen. At the end of this year, the Global Climate Conference will be held again in Cancun, Mexico. Global warming caused by excessive carbon dioxide emissions has seriously threatened human survival. Therefore, this conference is also known as the "last chance to save mankind". However, energy is the foundation of human survival and development. The energy used in society today, including oil, coal, natural gas, etc., is non-renewable, and after use, it will inevitably emit carbon dioxide and other harmful substances, which will pollute the environment. Therefore, people of insight strongly call on mankind to stop developing in this way, because our earth is already "feverish".

Dr. Steven Chu, a famous Chinese-American scientist, said in his "Apollo Project": "Even if all global energy needs are met by solar power generation, the area required will only account for 2.3% of the total ocean area or 51.4% of all deserts, or even 91.5% of the area of ​​the Sahara Desert." It seems that solar energy has a very promising future.

It's just that the current technology is too expensive to use solar energy and the efficiency is too low. Among the existing solar energy utilization technologies, the lowest cost solar energy utilization method should be the tower solar thermal technology developed by the United States and Israel in the 1970s. The material used is only glass flat mirror, and the cost of the material is extremely low, which is completely possible to use solar energy on a large scale. However, for more than 30 years, due to the fact that the focusing and aiming technology has not been solved, such a good tower solar thermal utilization technology has remained in the scientific research stage until now, and has not been well utilized to benefit mankind. Academician He Zuoxiu of the Chinese Academy of Sciences recently wrote an article "Physics and Adjustment of Energy Structure" and also mentioned this technology. He wrote: The principle of tower power generation is: place the collector on a certain high tower, place solar reflectors that can track the sun around it, and focus the sunlight on a certain concentrator. The advantages are high concentration ratio, high collector temperature, short heat exchange path, small heat loss, and thus high overall efficiency of the system. However, due to the particularly complex structure and high technical requirements, large-scale industrialization is very difficult. "

He Kaihao also introduced: In the previous period, a 1MW "tower" thermal power generation test station was built in Yanqing District, Beijing, supported by the National 863 Program. Among the six heliostats that had been built, one was blown down by a force 6 gale! The reason was that its mirror surface was 10m×10m in area. A natural idea is to use the adaptive optics focusing method to transform the heavy and large but "fragile" heliostat.

He Kaihao's patented invention, "The focusing and aiming device for tower-type solar thermal power generation system", is used to solve the technical problems of focusing and aiming in tower-type solar thermal power stations.

The technical solution adopted by He Kaihao's patent is: a focusing aiming device for a tower-type solar thermal power generation system, including a laser beam generator, a light collection and projection mechanism, and a projection drive mechanism. The laser beam generator is fixedly set on the solar concentrators surrounding the tower and is located at the rotation center of the reflector of the solar concentrator. The laser beam generators on each solar concentrator sequentially emit laser beams aimed at the solar cooker of the tower. The light collection and projection mechanism and the projection drive mechanism are set near the optical path of the laser beam. The light collection and projection mechanism is composed of a projection reflector or a refractor. When the laser beam generator emits a laser beam, the projection drive mechanism drives the light collection and projection mechanism to move to the optical path of the laser beam, and the laser beam is reflected or refracted onto the light detection screen through the light collection and projection mechanism.

Talking about the patent, He Kaihao introduced: "The principle of this patented technology is very simple. First of all, it is a method of solving geometry problems based on auxiliary lines in mathematics. The geometric auxiliary line is a laser beam that shoots from the center of each heliostat to the target of the focusing tower. With this laser beam as an auxiliary line, it becomes very simple to judge whether the sunlight reflected by the heliostat is aimed at the target. Although the principle is simple, it is of great significance. Secondly, the implementation method of my patent is particularly simple. Especially now that computers and electronic digital technology are advancing by leaps and bounds. In fact, my patent can be installed with a digital camera (or a digital camera that can be bought in a shopping mall for 30-50 yuan) plus a laser pen."

The principle of this installation is very simple, which is to use the principle that parallel light will be reflected by a concave mirror or refracted by a convex lens and converge to a point at the focus. Since sunlight is not an absolutely parallel light, it converges to a circular spot at the focus, while the laser beam can be focused to a point. It is enough to detect whether the point where the laser beam is focused is at the midpoint of the circular spot where the sunlight is focused. However, after the sunlight and laser beam are focused, the light is very strong, and a shading sheet needs to be added in front to block most of the light. (Of course, when this technology is industrialized on a large scale, it will no longer be possible to use it directly with a digital camera or digital video camera. It should be redesigned according to the characteristics of detecting strong light such as sunlight and laser beams.)

The implementation method is simple and the implementation cost is low. It is a wise move to use it in large-scale industrialization. However, He Kaihao's innovative thinking burst out again. He pointed out that the best place to collect solar energy should be on the roof and wall of the building, so that you can generate electricity while sitting at home without occupying land. However, in this case, the heliostat installed on the roof or wall should be as small as possible. The smaller the heliostat is, the more flexible it is to rotate and the less affected by wind. However, if the heliostat is small, each heliostat needs to be installed with a target aiming detection device, so that a lot of such target aiming detection devices need to be installed, which is a considerable cost. Use a plane mirror or a prism to make a light projection device, and project the light that needs to be detected in a large number of heliostats to one place for one-by-one detection. A large number of heliostats can share a target aiming detection device (that is, the light detection screen above Figure 1), so there is no need to install a target aiming detection device on each heliostat, thereby reducing costs.

It can be said that with a laser beam as a reference light for aiming, the implementation methods of the target aiming detection device can be varied and ever-changing, and the above are just a few of them. The most critical core method is to use a laser beam as a reference light for aiming. This patented method has a simple and clear principle, a simple and easy implementation method, and can ensure accurate aiming. The difficult aiming problem of the tower solar thermal power generation system that has troubled people for more than 30 years can be easily solved. It provides a simple and easy method for people to use solar energy on a large scale to solve our energy problems.

The breakthrough in the tower solar thermal power generation system technology has opened up a new path for the development, utilization and promotion of solar energy in my country. It can be foreseen that if this innovative achievement is scientifically and effectively promoted, it will effectively solve the energy shortage and environmental problems caused by energy, and may also refresh the existing energy use pattern.

[Character Profile]

He Kaihao, born in 1964, studied Chinese medicine at Taizhou Health School in Zhejiang Province from 1981 to 1984. After graduation, he has been working at Ningbo Traditional Chinese Medicine Hospital. During his years of work, he loves invention, insists on invention and creation, and has obtained many patents hekh@mail.nbptt.zj.cn.