A kind of control method of tower heat absorber with wind screen
A control method and technology for a heat absorber, which are applied in the field of high-temperature solar energy collection and utilization, can solve the problems of large heat loss by heat absorber, and achieve the effects of reducing convective heat loss and reducing convective heat transfer.
Active Publication Date: 2022-07-12
THE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a control method for a tower heat absorber with an air curtain, aiming at solving the problem of large convective heat loss of the heat absorber in the prior art. question
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specific Embodiment 1
[0117] The height of the heat-absorbing tube assembly of the heat-absorbing device is 6.2 m, and the diameter of the heat-absorbing device is 5.1 m. The outlet jet velocity of the upper and lower air curtains is 12 m / s, and the jet angle of the upper air curtain is 10° downward and outward. Correspondingly, the jet angle of the lower air curtain is 10 degrees upward and outward. The radial distance from the outlet of the upper air curtain machine and the lower air curtain machine to the heat absorption pipe assembly is 30 cm. The outer surface temperature of the heat-absorbing tube assembly is 600°C, the ambient temperature is 27°C, and the external wind speed of the heat-absorbing device is 10 m / s. When the wind traverses the heat-absorbing device, it can be calculated according to the heat transfer theory, and the value of the convective heat transfer coefficient between the heat-absorbing device and the air is 29.63 W / (m 2 ·K). The convective heat transfer coefficient is ...
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The invention discloses a control method of a tower heat absorber with a wind screen. The tower heat absorber with a wind screen comprises: a heat absorption device; an upper wind screen structure is arranged on the upper part of the heat absorption device, and the air is discharged downward; the lower air curtain structure is arranged at the lower part of the heat absorbing device, and the air is discharged upward; wherein, the air outlet of the upper air curtain structure and the air outlet of the lower air curtain structure form an air screen; The control method includes: acquiring wind flow information of the environment where the heat absorbing device is located; according to the wind flow information, activating the upper wind screen structure and the lower wind screen structure to form a wind screen. Because the wind screen is formed by controlling the upper air curtain structure and the lower air curtain structure, the wind screen blocks the external high-velocity air from sweeping the surface of the heat absorption device, which can form a low convection environment or a windless environment on the surface of the heat absorption device, which greatly reduces the Convective heat transfer is achieved, thereby greatly reducing the convective heat loss of the heat sink.
Description
technical field [0001] The invention relates to the field of high temperature heat collection and utilization of solar energy, in particular to a control method of a tower heat absorber with a wind screen. Background technique [0002] High-temperature solar heat collection is an important heat utilization method of renewable energy. The main technical forms include trough, tower, dish and Fresnel heat collection. The tower type concentrating heat collector has the advantages of high collecting temperature (550-600 ℃) and reliable operation, and is widely used in the field of high temperature thermal power generation. The tower concentrating heat collection system mainly includes tower heat absorber, condenser lens and tracking equipment. [0003] In the prior art, the tower heat absorber is located at the center of the condenser field. Due to the huge mirror field, the heat absorber is generally located at a height of 100 meters or even hundreds of meters to receive the co...
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IPC IPC(8): F24S50/00F24S10/70F24S40/10
CPCF24S50/00F24S10/70F24S40/10Y02E10/44
Inventor 王其梁杨洪兴姚尧沈志成
Owner THE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST