CN102889769A

CN102889769A - Solar dryer

Info

Publication number: CN102889769A
Application number: CN2012104559383A
Authority: CN
Inventors: 王金平; 徐少凡; 樊小平
Original assignee: ZHENJIANG QIZHENG NEW ENERGY CO Ltd
Current assignee: ZHENJIANG QIZHENG NEW ENERGY CO Ltd
Priority date: 2012-11-14
Filing date: 2012-11-14
Publication date: 2013-01-23

Abstract

The invention discloses a solar dryer. The dryer comprises a solar collector, a medium pipeline, a ventilating pipeline and a drying cabin, wherein a heat absorber of the collector is formed by a porous heat absorbing plate with a snake bend welded on the back; the snake bend is filled with heat-conducting media with boiling points at about 30 DEG C; a heat release pipeline divided into a plurality of layers is designed on the upper layer of the drying cabin; and the heat release pipeline and the heat absorber are connected by a pipeline. The dryer has the beneficial effects that the heat-conducting media circularly flow between the heat absorbers and the heat release pipeline and transmit heat to the dried objects quickly, thus reducing the heat loss and increasing the drying speed; and the air passes through the porous heat absorbing plate, absorbs heat and becomes hot air, the hot air is sent into the drying cabin and takes away moisture, and the hot air can be recycled after being dried by the dryer.

Description

A kind of solar dryer

Technical field

The present invention relates to solar energy utilization technique and crops dry technology, refer in particular to a kind of solar dryer, the solar thermal collector absorber of this drier is made of coiled pipe and porous plate, can heat heat-conducting medium and air, the indoor design of dryness storehouse has the heating pipeline, behind the dryness storehouse air outlet, with drier, hot-air can be recycled.

Background technology

In the dry field of crops, common drying source mostly is fire coal or fuel Heating now, and hot air temperature causes product quality to descend about 200 ℃ easily.It is about 50 ℃ that the solar thermal collector routine is utilized temperature, just in time meets the optimum temperature range of crops drying, and the solar energy wide material sources, cheap, just is being suitable for dry crops.

At present existing a plurality of patents about solar dryer, but owing to solar energy utilization ratio hangs down reasons such as reaching high cost, still remain to be promoted.Below list several existing Patents:

(application number: 200620057287.2) propose a kind of solar dryer, its thermal-arrest partly is collection flat heat to patent " quick high-temp solar dryer ", and air flows through heat absorption from the passage between flat board and the transparent cover plate, enters drying device and carries out drying.

(application number: 201010600814.0) propose a kind of solar dryer, its thermal-arrest partly is heat collecting glass tube to patent " solar dryer ", and by the two-period form fin heat pipe heat is delivered to drying box.Waste heat reclaims by the Waste Heat Recovery heat exchanger.

Existing patent mostly is utilizes the solar energy heating air, then utilizes the hot-air will be as drying.But because the capacity of heat transmission of hot-air itself is lower, so that a large amount of heats does not take full advantage of, reduced the whole thermal efficiency.

Summary of the invention

In order to improve the heat transfer rate between solar thermal collector and the dryness storehouse, promote the overall thermal efficient of drier, the present invention proposes following technical scheme.

The present invention proposes a kind of solar dryer, structure comprises solar thermal collector, medium pipeline, ventilation shaft, drier and dryness storehouse, wherein the solar thermal collector concrete structure comprises snake bend, porous absorber plate, insulation shell, transparent cover plate, air inlet pipe, escape pipe, be filled with the heat-conducting medium of boiling point about 30 ℃ in the snake bend, and be welded on the porous absorber plate, the porous absorber plate is divided into ante-chamber and back cavity with heat collector, and air inlet pipe is communicated with back cavity, and escape pipe is communicated with ante-chamber; The dryness storehouse structure comprises blast pipe, discharge pipe, blower fan, porous plate, heat release pipeline, the heat release pipeline is divided into some layers, one deck and the porous plate of foot are fixed together, the snake bend of heat release pipeline and flat-plate solar collector passes through pipeline communication, medium enters from the upper strata pipeline, reflux from lower floor's pipeline, blast pipe is communicated with the heat collector escape pipe through blower fan, and the top drying device that discharge pipe is positioned at dryness storehouse is connected with the heat collector air inlet pipe.Porous plate is separated into two cavitys with dryness storehouse, and blower fan is placed by lower floor, and the thing that is dried is placed on the upper strata.The heat release tube contacts of thing and the multilayer of being dried and heat absorption, hot-air passes the thing that is dried from porous plate, and moisture is taken away.The heat release pipeline is that the metal tube of multilayer serpentine bend is made.The runner of the heat absorption in-vivo medium of flat-plate solar collector is snakelike, is convenient to abundant heat absorption.The silica gel that can reuse is equipped with as drier in drier inside.

By the structure of improvement flat-plate solar collector absorber and the composition of inner heat-conducting medium, can increase the flow velocity of medium, improve the exchange velocity of heat between flat-plate solar collector and the dryness storehouse.Heat-conducting medium circulates between heat release pipeline and absorber, undergoes phase transition, and with the heat transferred thing that is dried, the thing temperature that is dried is raise.The aperture heat absorption that air passes on the heat collector porous plate becomes hot-air, and blower fan makes hot-air flow through the thing that is dried, and moisture is taken away, and is recycling after the hot-air drying device drying, reduced thermal loss.

Description of drawings

Below in conjunction with accompanying drawing, the invention will be further described.

Fig. 1 is the overall schematic of this device.

Fig. 2 is dryness storehouse A-A profile.

Fig. 3 is dryness storehouse B-B profile.

Fig. 4 is the front elevation of heat collector.

Fig. 5 is the C-C profile of dryness storehouse.

Fig. 6 is the heat absorbing part back view of heat collector.

Fig. 7 is heat collector D-D profile.

The position of marking is respectively among the figure: 1, insulation shell; 2, escape pipe; 3, air inlet pipe; 4, transparent cover plate; 5, porous absorber plate; 6, snake bend; 7, drier; 8, heat release pipeline; 9, porous plate; 10, blast pipe; 11, discharge pipe; 12, blower fan; 13, ante-chamber; 14, back cavity.

The specific embodiment

Below in conjunction with accompanying drawing, embodiments of the present invention are described further.

In the sun-drenched situation, low boiling heat-conducting medium in the snake bend 6 heat absorption vaporization flows at a high speed from heat release pipeline 8 upper stratas along pipeline, and heat release liquefaction, flows back to snake bend 6 from heat release pipeline 8 lower floors after the liquefaction.Blower fan 12 starts, and air from air inlet pipe 3 suction heat collector ante-chambers 13, is passed 5 heat absorptions of porous absorber plate, becomes hot-air and enters dryness storehouse by escape pipe 2, blast pipe 10.The thing that is dried is deposited on the porous plate 9, and heat release pipeline 8 is covered absorbing heat from heat release pipeline 8.Hot-air passes porous plate 9 and flows through the thing that is dried, and moisture is taken away, and enters drier 7 through discharge pipe 11.Hot-air is dried and enters solar thermal collector by air inlet pipe 3.

Claims

1. solar dryer, this device is by solar thermal collector, medium pipeline, ventilation shaft, drier and dryness storehouse, wherein the solar thermal collector concrete structure comprises snake bend (6), porous absorber plate (5), insulation shell (1), transparent cover plate (4), air inlet pipe (3), escape pipe (2), be filled with the heat-conducting medium of boiling point about 30 ℃ in the snake bend (6), and be welded on the porous absorber plate (5), porous absorber plate (5) is divided into ante-chamber (13) and back cavity (14) with heat collector, air inlet pipe (3) is communicated with back cavity (14), and escape pipe (2) is communicated with ante-chamber (13); The dryness storehouse structure comprises blast pipe (10), discharge pipe (11), blower fan (12), porous plate (9), heat release pipeline (8), heat release pipeline (8) is divided into some layers, one deck of foot and porous plate (9) are fixed together, heat release pipeline (8) passes through pipeline communication with the snake bend (6) of flat-plate solar collector, medium enters from the upper strata pipeline, reflux from lower floor's pipeline, blast pipe (10) is communicated with heat collector escape pipe (2) through blower fan, and the top drying device that discharge pipe (11) is positioned at dryness storehouse is connected with heat collector air inlet pipe (3).

2. a kind of solar dryer according to claim 1, it is characterized in that: porous plate (16) is separated into two cavitys with dryness storehouse, blower fan (13) is placed by lower floor, the thing that is dried is placed on the upper strata, heat release pipeline (15) is made for the metal tube of multilayer serpentine bend, and the silica gel that can reuse is equipped with as drier in drier (7) inside.