A frame and a solar heat collecting device with the frame

Abstract

A frame and solar heat collector having same; the frame comprises a frame unit; the frame unit comprises two ground fixed mounts (1), a rotating beam (2), a hanger (3), a gravity equalizing beam (5) and a vacuum heat collection pipe (10); two ends of the rotating beam (2) are respectively arranged on the two ground fixed mounts (1) and rotatable relative to each other; the hanger (3) is fixedly connected to the rotating beam (2) located thereabove, and can swing from side to side; the gravity equalizing beam (5) is connected to the rotating beam (2); and the vacuum heat collection pipe (10) is tightly attached below the rotating beam (2). The frame has a reasonable bearing mechanical structure, reducing the consumption of metal, reducing the total mass, improving overall strength and structural stability, and improving wind resistance, and synchronization and stability of frame rotation.

Description

technical field [0001] The invention relates to a solar heat collecting device, in particular to a frame of a trough type solar heat collecting device and its device. Background technique [0002] Producing energy from solar energy at low cost is a goal that human beings are constantly exploring and pursuing, especially in the current energy and environmental conditions. In recent years, renewable energy technology has developed rapidly, but the conditions for low-cost industrialized energy production are not yet available. The cost of solar power generation is much higher than that of conventional thermal power generation. At the same time, the intermittency of new energy sources such as wind power and photovoltaic power generation cannot meet Grid requirements for power production scheduling. Trough solar thermal power generation is the only solar thermal power generation technology that has achieved commercial operation, and it has a history of more than 30 years. Under...

AI Technical Summary

Problems solved by technology

[0003] 1. Poor manufacturing precision of reflectors: The existing mainstream technology is glass thermal bending forming trough reflectors. Due to the high temperature in a large space, the uniformity of the temperature field in the entire area cannot be controlled for a long time, accurately and effectively, and the optical characteristics of the product The shape is different, the shape cannot be guaranteed to be accurate, and there are a lot of ripples in the microscopic. When it is used, the edge of the line focus light band is blurred, and the light band exceeds 70mm (25mm under the optical precision). 185 times the theoretical value is far away. The essence of solar energy concentration technology is to achieve a high proportion of concentration. Due to the low energy density of its concentration, it will have a great impact on further utilization

[0004] 2. Poor installation and debugging performance and use performance of the reflector: the back of the reflector is glued to the nut, which is connected to the mounting frame by bolts, and at the same time the spatial positioning adjustment of the reflector is realized through the bolts. Due to the different optical characteristics of the reflector, each piece The installation of the reflector needs to be adjusted separately, and the installation and adjustment workload is huge

Moreover, because the bolts are used to directly connect the reflector, the area of ​​the force-bearing point of the reflector is too small, resulting in stress concentration, which will cause uncontrollable deformation of the reflector during use.

At the same time, due to the different linear expansion coefficients of the mounting frame and the reflector, at different atmospheric temperatures, it will cause a difference in expansion, which will cause the expansion of the reflector to be deformed by force, and the stability of the optical characteristics cannot be guaranteed.

In addition, only bolts are used to connect the reflector and the mounting, and the overall force is almost entirely borne by the mounting, resulting in a large amount of metal consumption and high raw material costs.

[0005] 3. The manufacturing process of the mounting frame is difficult: the geometric size of the mounting frame of the unit is very large, which needs to be processed as a whole, and it is very heavy, and the positions of the mounting bolts of a large number of mirrors need to be positioned in a separate space, which cannot achieve standardized production, and it is very difficult to ensure accuracy. , high manufacturing cost

Since the mounting frame needs to carry the overall load of itself and the reflector unit, the reflector unit is assembled as a whole after the reflector is installed, and its own weight is as high as several thousand kilograms. To be transported from the workshop to the installation site, it needs to be hoisted by a large crane , the overall installation and positioning process is more difficult

[0006] 4. The stability of the overall device is poor: the device with a length of about 150 meters only has a point in the middle to drive the rotation.

In the case of wind load, the two ends will inevitably shake. If the wind is too strong, it will easily cause permanent deformation of the frame.

At the same time, due to the high difficulty of adjusting the center of gravity, under normal operating conditions without wind, the change of the center of gravity will easily lead to the deviation of the positions of the two ends, resulting in a large amount of concentrated light not reaching the heat collecting tube in the center.

[0007] 5. The production cost of the vacuum heat collecting tube is high: because the reflector cannot accurately concentrate light, the heat collecting tube needs a large diameter, the material cost is high, the manufacturing technology is difficult, and the yield is low, resulting in its purchase cost being less than 5 times higher than the pipe diameter

[0008] 6. High requirements for rotating tracking parts: Since there is only one driving force point of the rotating power parts, a large torque will be generated when driving a 150-meter long-span device, and the strength requirements of the rotating parts are high

[0009] 7. Low thermal energy utilization efficiency: Since the steam required for power generation cannot be directly produced, heat transfer oil is needed as an intermediate heat exchange medium, and a heat transfer oil circulation system, heat transfer system between heat transfer oil and steam, water, heat transfer oil and Heat exchange systems for heat storage materials and heat transfer oil storage devices, etc.

[0011] 9. High overall cost: the power consumption of the existing systems is higher than 14% of its power generation, while the power consumption of conventional thermal power generation is only about 5% of its power generation, mainly due to the rotation of the drive mechanism and the circulation of heat transfer oil. And the auxiliary heat exchange cycle system, etc. have greatly increased the power consumption

Moreover, the overall defects of the existing technology lead to the high equipment cost, installation and construction cost, and operation and maintenance cost of the current trough solar power generation system. The cost of thermal storage units put into production abroad is as high as 6,000 euros / KW. The feasibility of domestic multi-projects The estimated cost is higher than 35,000 yuan / KW, and the high investment and operation and maintenance costs make the power generation cost much higher than that of conventional coal power generation

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