A medium and high temperature heat collection device for solar energy

Abstract

The invention discloses an intermediate and high-temperature solar heat collection device which comprises a condenser lens, a condenser lens support, reflectors, a reflector support and a concave hollow heat collection body. The condenser lens is arranged on the condenser lens support, the reflectors are arranged on the reflector support, space of a concave bottom of the concave hollow heat collection body is positioned at a focal spot of the condenser lens, the integral concave hollow heat collection body is arranged inside a concave hollow heat collection body supporting seat, heat collection working medium inlet and outlet pipes are arranged on the concave hollow heat collection body, the condenser lens support and the reflector support jointly form a hollow conical support, a small conical end of the reflector support is connected with the concave hollow heat collection body supporting seat, a heat-insulation layer is arranged between the concave hollow heat collection body and the concave hollow heat collection body supporting seat, and closed space is jointly formed by the condenser lens, the reflectors and the concave hollow heat collection body in an enclosed manner. The intermediate and high-temperature solar heat collection device has the advantages of low heat loss and price, high energy efficiency, long service life, good stability, simple structure and convenience in maintenance.

Description

technical field [0001] The invention relates to a solar heat collecting device, in particular to a solar medium and high temperature heat collecting device. Background technique [0002] China's solar energy industry is developing very rapidly, but its application fields are basically concentrated in the low-temperature civilian field. Since 70% of China's energy consumption is used in industry, the popularization of solar energy in the low-temperature civilian field cannot alleviate my country's energy shortage and lagging behind in emission reduction. Since the 1980s, China has begun to develop solar energy utilization technology at medium and high temperatures, and has achieved Substantial progress has been made, with breakthroughs in a number of new technologies such as trough concentrators, high-temperature vacuum heat collectors, high-temperature heat-collecting working fluids, and phase-change energy storage materials, making the application of solar energy in the high...

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Problems solved by technology

[0003] 1. The trough condenser is a linear concentrating mode. In order to achieve the concentration ratio required by the medium and high temperature, the trough condenser needs to be made very large, which brings great costs to installation, manufacturing and maintenance. At present, this type of collector The cost of the device is more than 2,000 yuan per square meter;

[0004] 2. The trough condenser and high-temperature vacuum heat collection tube are an open structure. The light diverged during transmission and reflection is not used twice, and the loss is large. The current heat collection efficiency is below 60%;

[0005] 3. At the same time, the open structure is directly eroded by rain, snow, wind, frost and dust, resulting in high maintenance costs and short service life, generally within 10 years;

[0006] 4. In order to reduce the emissivity of high-temperature vacuum heat collector tubes, selective absorption coatings must be used, and this coating has a short life and high price;

[0007] 5. The core technology of high-temperature vacuum heat collector --- metal glass welding technology is monopolized by foreign countries, with poor stability and high price

[0008] If a two-ton steam boiler is operated for 10 hours a day and 300 days a year, the investment cost of the boiler is 200,000 yuan, and the annual operation cost is 900,000 yuan; while using an equivalent solar energy device, the investment cost is about 10 million yuan, and the annual operation cost is 20 million yuan. Apparently, the disadvantages of poor economy shown by the above data make enterprises unwilling to take the initiative to invest in this project

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