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Process control method for drier and heat collecting liquid

A dryer and heat collection technology, applied in the field of solar radiation heat energy utilization, can solve the problems of inability to dynamically adjust the dryer, large fluctuations in the heat collection temperature and heat collection, and great influence of the heat collection temperature, so as to improve the heat collection efficiency and increase the Stability and efficiency, the effect of improving adaptability

Active Publication Date: 2018-11-27
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the heat-collecting liquid in the solar heat collector relies on natural convection or pump flow, and the heat-collecting temperature is greatly affected by solar radiation, and the heat-collecting temperature and heat-collecting amount fluctuate greatly, which cannot be dynamically adjusted according to the actual demand of the dryer.

Method used

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  • Process control method for drier and heat collecting liquid
  • Process control method for drier and heat collecting liquid
  • Process control method for drier and heat collecting liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0031] figure 1 A schematic diagram showing the structure of a dryer according to one embodiment of the present invention. The heat energy absorbed mainly by the heat collecting liquid in the heat collector is used to dry the object to be dried in the drying box. And by adjusting the heat collection level of the heat collector, different heat supply demands can be met.

[0032] Such as figure 1As shown, in the case where the heat collecting liquid is a liquid medium, the dryer mainly includes: a drying box 15 with a heat exchanger 14 inside and a heat collector for providing drying temperature to the heat exchanger, and the heat collector It mainly includes a casing and a heat collecting part placed in the casing; the casing is mainly used as a carrier of the heat collecting part and ensures that sunlight can pass through the cover glass 21 of the casing to irradiate the heat collecting part. The heat collecting part mainly includes the liquid inlet and liquid pipe 1, the...

Embodiment 2

[0147] In the case that the heat collecting liquid is a gaseous medium, the structure of the dryer is as follows: image 3 shown, which is the same as figure 1 The difference is that there is no need to arrange a heat exchanger 14 in the drying box 15, and it is sufficient to directly connect the upstream inlet of the liquid inlet and liquid distribution pipe 1 and the downstream outlet of the liquid outlet collecting pipe 3 with the drying box 15. At this time, what the drying temperature sensor 64 detects is the outlet air temperature at the downstream outlet of the outlet liquid collection pipe 3 protruding into the drying box 15 .

[0148] Adopting the heat collecting liquid control method of the present invention to realize the drying step of the object to be dried in the drier is specifically as follows: after starting up, the control part according to the parameters of the heat collector (such as including the size of the heat collector, the capillary heat absorption t...

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Abstract

The invention relates to a dryer and a flow path control method for heat collecting liquid. The dryer comprises a drying box and a solar heat collector; the heat collector comprises a shell and a heat collecting part arranged in the shell; the heat collecting part comprises a liquid inflow and distribution pipe, a liquid outflow and collecting pipe and pulsation heat pipe heat collecting units arranged between the liquid inflow and distribution pipe and the liquid outflow and collecting pipe; each pulsation heat pipe heat collecting unit comprises a compound parabolic concentrator, a pulsation heat pipe heat absorber and a double-pipe heat exchanger; each pulsation heat pipe heat absorber is formed by a plurality of evaporation segments and condensing segments at intervals; the evaporation segments are arranged on the compound parabolic concentrators in a column-crossing manner; the two ends of a sleeve shell of each double-pipe heat exchanger is communicated with the liquid inflow and distribution pipe and the liquid outflow and collecting pipe correspondingly; the condensing segments are arranged in the sleeve shells; and the heat collecting liquid forms a flowing path among the liquid inflow and distribution pipe, the liquid outflow and collecting pipe and at least one portion of each double-pipe heat exchanger. According to the dryer, the drying requirement can be met by adjusting the flow path of the heat collecting liquid.

Description

technical field [0001] The invention relates to the field of utilization of solar radiation heat energy, in particular to a drier and a process control method for heat collecting liquid. Background technique [0002] At present, the heat collecting liquid in the solar heat collector flows by natural convection or pump. The heat collector temperature and flow are passively adjusted, and it is impossible to dynamically adjust the operating state (heat collector temperature and flow) according to actual needs to adapt to changes in weather and usage requirements; and solar collectors usually use flat-plate heat-absorbing surfaces to absorb solar energy. Moreover, the temperature of the heat-absorbing surface is generally higher than that of the heat-absorbing tube, forming a high-temperature radiation surface and a heat leakage surface, which affect the heat collection efficiency. [0003] At present, the improvement of solar heat collectors is mainly carried out for the heat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B23/00F24S10/95F24S80/00F24S23/71F24S50/00F24S10/70
CPCF26B23/00Y02E10/44
Inventor 徐荣吉张晓晖栾义涛王华生范志杨刘明宣
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE