CN104807318A - Variable-temperature drying device of medium and high temperature heat pump - Google Patents
Variable-temperature drying device of medium and high temperature heat pump Download PDFInfo
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- CN104807318A CN104807318A CN201510204796.7A CN201510204796A CN104807318A CN 104807318 A CN104807318 A CN 104807318A CN 201510204796 A CN201510204796 A CN 201510204796A CN 104807318 A CN104807318 A CN 104807318A
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Abstract
The invention discloses a variable-temperature drying device of a medium and high temperature heat pump. According to the variable-temperature drying device, the technical advantages of wide drying temperature zone (0 to 80 DEG C) and controllable humidity of a drying media (air) of the medium and high temperature heat pump are utilized, an electric temperature and moisture control air valve is regulated to obtain a controllable sealed, semi-open or fully-open heat pump system, the variable-temperature and variable-moisture segmental drying of agricultural products is realized, and the purposes of low energy consumption of a drying process and high quality of dried products can be achieved. Materials can be prevented from thermal destruction in a high moisture environment by variable-temperature drying, and variable-moisture drying can be used for preventing the surfaces of materials from crusting or hardening and is favorable for inside moisture from transferring to the surfaces. The variable-temperature drying device adopts an intermittent drying mode. Compared with hot air drying equipment which gives priority to power consumption, the variable-temperature drying device has prominent energy efficiency, and the quality of a product dried by the variable-temperature drying device can be more easily controlled. The variable-temperature drying device can be widely applied to the drying of heat sensitive materials, such as agricultural products and aquatic products, and can be used for drying in industries, such as biological products, Chinese patent medicines and chemical engineering.
Description
Technical field
The present invention relates to a kind of thermal sensitivity agricultural product moderate and high temperature heat drying device, particularly relate to the moderate and high temperature heat drying machine of high added value agricultural product material.
Background technology
Agricultural product have thermal sensitivity, and its drying is a processing difficult problem always.Traditional heated air drying is high due to baking temperature, easily causes biology, physicochemical change, causes material table panel knot, active ingredient destruction, deterioration in quality.Freeze drying, vacuum drying due to investment cost, operating cost high, be not widely used in agricultural product dry run.Hot pump in low temp drying (0 DEG C-45 DEG C) is the remarkable and practicable drying means of a kind of efficiency, and its dry products quality is high, quality better, but its shortcoming is that drying time is oversize, and low temperature drying easily causes biological pollution.
In recent years along with the development of moderate and high temperature heat technology, moderate and high temperature heat to be mainly used in higher than the thermal source of 55 DEG C as temperature and to provide domestic hot-water for warm.On market, relevant drying equipment is moderate and high temperature heat drying room and closed baking oven mainly.Drying room mainly utilizes moderate and high temperature heat directly or indirectly to add heated air drying material, and interval reaches the object of dried material to environment hydrofuge air.This kind of drying room baking temperature, humidity are wayward, unstable product quality.The low temperature that closed baking oven mainly utilizes heat pump assembly to be discharged by drier, highly humid air, after dehumidifying, heating up, become high temperature, the air of low humidity enter drier again as drying medium, make material obtain drying and so forth.This kind of baking railway carriage or compartment also exists the later stage of drying thermal efficiency decline problem.
Research finds, adopt low temperature drying at the agricultural product dry initial stage, under can avoiding high moisture environments, high temperature is to the heat damage of nutritional labeling; Along with the reduction of material moisture, active ingredient, to temperature-insensitive, adopts high temperature to stop drying and can prevent microbial contamination, shorten drying time.This segmented alternating temperature drying is more suitable for the dehydration of heat sensitivity agricultural product.Moderate and high temperature heat, due to baking temperature interval wide (0 DEG C-80 DEG C), more easily realizes agricultural product alternating temperature, becomes humidity drying.Alternating temperature drying can avoid material heat damage in High water cut environment, becomes wet drying and can avoid material surface crust, sclerosis, be conducive to internal moisture to surface migration.
The principle of heat pump drying be utilize heat pump assembly to be discharged by drier low temperature, highly humid air after dehumidifying, heating up, become high temperature, the air of low humidity enter drier again as drying medium, make material obtain drying and so forth.Heat pump drying is applied to multiple dry field, the particularly solid drying such as food and timber field just gradually as the significant drying mode of a kind of efficiency.The technical advantage that the present invention mainly utilizes moderate and high temperature heat baking temperature wide ranges, drying medium (air) humidity controlled, air-valve is controlled by regulating electronic wet temp, obtain closed, half-open and full-open type system, realize the alternating temperature of equipment, become wet dry, reach dry run low energy consumption, object that dry products quality is high.
Summary of the invention
The technical advantage that main purpose of the present invention utilizes moderate and high temperature heat baking temperature wide ranges (0 DEG C-80 DEG C), drying medium (air) humidity controlled exactly, air-valve is controlled by regulating wet temp, obtain closed, half-open and full-open type system, realize the alternating temperature of equipment, become wet dry, solve hot pump in low temp long for drying time, easily cause biological pollution and closed type hot pump drying system the later stage of drying thermal efficiency decline problem.
The present invention utilizes auxiliary condenser to realize the thermostatic control of closed drying system, meets the requirement of agricultural product different dry drying process.At the dry initial stage, material contains large quantity of moisture, and high temperature drying easily causes the heat damage of material active ingredient.Therefore, dry initial stage High water cut agricultural product easily adopt hot pump in low temp dry.In dry run, the temperature of drying medium constantly raises because of heat pump effect, when temperature reaches setting baking temperature, and accessory fan, auxiliary condenser work, and unnecessary heat is drained in environment.Now, the exsiccation of heat pump still carries out, and the relative humidity of drying medium remains on low value, can realize the constant temperature to material, low humidity continues drying.
The present invention utilizes Temperature and Humidity Control air-valve to realize half-open, the standard-sized sheet mode of drying system, solves heat pump drying later stage thermal efficiency decline problem.Along with the carrying out of drying, material moisture reduces, and the absolute humidity of closed type hot pump drying system inner drying medium declines, and heat pump callable heat from drying medium reduces, and the heat pump thermal efficiency declines, and energy-saving effect is not obvious.Now, adopt half-open or full-open type drying system, the heat in surrounding air can be carried out reclaim, utilize, improve the thermal efficiency of heat pump.In addition, regulate Temperature and Humidity Control air-valve opening degree can realize system and become humidity drying, meet the demand of different agricultural product drying process.
The dry railway carriage or compartment of the present invention adopts wind deflector and homogenating plate Combination Design, overcomes " dry dead angle " problem that drier inner drying efficiency is low and cause because of matter, heat trnasfer inequality.
The present invention realizes like this, a kind of moderate and high temperature heat alternating temperature drying device, be made up of middle-and high-temp heat pump equipment, dry envelope, wind deflector, porous homogenating plate, electronic Temperature and Humidity Control air-valve, three ventilation ducts, in dry envelope, establish material frame, wind deflector, Temperature Humidity Sensor be provided with feeding gate; It is characterized in that, in dry envelope, be provided with porous homogenating plate, form dryness storehouse and two, air channel independently warehouse; Airduct is repeatedly kicked in dry envelope upper end, and communicated with middle-and high-temp heat pump equipment by three ventilation ducts of charged dynamic temperature humid control air-valve, dry envelope lower end is connected discharge pipe and is communicated with middle-and high-temp heat pump equipment by three ventilation ducts of charged dynamic temperature humid control air-valve, and forms loop.Dry envelope is connected with middle-and high-temp heat pump equipment through three ventilation ducts; Three ventilation ducts and the open close of external environment are controlled by electronic Temperature and Humidity Control air-valve, and feasible system is closed dry, realize open system formula dry after also can communicating with external environment condition.
Condenser, auxiliary condenser, choke valve, evaporimeter, fluid reservoir, middle high temperature compressor, two-way valve by after copper pipe connects successively and main air blower, accessory fan, water-collecting tray be placed in heat pump casing and form middle-and high-temp heat pump equipment.Cold-producing medium adopts the composite work medium based on R134a.Wherein, compressor, accessory fan and auxiliary condenser are exposed in environment; The import of compressor communicates with evaporimeter after fluid reservoir, and its outlet communicates with condenser, auxiliary condenser respectively after two-way valve; The other end of condenser, auxiliary condenser communicates with evaporimeter through choke valve, and condenser arrangement main air blower, auxiliary condenser is configured with accessory fan.
Wind deflector and homogenating plate is provided with in dry railway carriage or compartment; Its air inlet communicates with the condenser of middle-and high-temp heat pump equipment through three ventilation ducts, and its air outlet to communicate with the evaporimeter of middle-and high-temp heat pump equipment through three ventilation ducts and forms loop; Three ventilation ducts control by electronic Temperature and Humidity Control air-valve and can communicate with the external world.
Closed moderate and high temperature heat drying is achieved in that three ventilation ducts communicated with the external world are closed, between dryness storehouse and heat pump assembly, form loop.
Half-open, full-open type moderate and high temperature heat drying system is achieved in that three ventilation ducts communicated with the external world are half-open or full-gear, and outside air can partly or entirely enter heat pump assembly and dryness storehouse under the effect of main air blower.
The present invention, compared with other drying equipment, has the following advantages:
(1) comparatively heated-air drying equipment, have employed the significant heat pump drying technology of efficiency.Comparing with electricity is the mode of heating of the energy, more saves energy consumption.
(2) moderate and high temperature heat baking temperature wide ranges, according to technique needs, agricultural product can realize alternating temperature drying, produce high-quality product.
(3) by regulating wet temp to control air-valve, realizing half-open and full-open type drying system, closed drying system the later stage of drying thermal efficiency decline problem can be avoided.
(4) wind deflector, homogenating plate is established in dryness storehouse.Gas flow rate and uniform distribution of temperature field in dryness storehouse, heat transfer, mass-transfer efficiency is high, avoids because heat, matter transmit irregular " the dry dead angle " caused, improves product drying quality and drying efficiency.
Accompanying drawing explanation
Fig. 1 is embodiments of the invention structural representation.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is that the A of Fig. 1 is to outside drawing.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
The present invention is made up of three ventilation ducts of condenser 1, compressor 2, fluid reservoir 3, evaporimeter 4, water-collecting tray 5, charged dynamic temperature humid control air-valve 6, discharge pipe 7, material frame 8, porous homogenating plate 9, wind deflector 10, Temperature Humidity Sensor 11, dry envelope 12, blast pipe 13, three ventilation ducts of charged dynamic temperature humid control air-valve 14, main air blower 15, moderate and high temperature heat casing 16, feeding gate 17, accessory fan 18, auxiliary condenser 19; Concrete connection layout is as accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3.Condenser 1, evaporimeter 4, auxiliary condenser 19, compressor 2, fluid reservoir 4 and choke valve, two-way valve by after copper pipe connects and main air blower 15, accessory fan 18, water-collecting tray 5 be placed in heat pump casing 16 and form middle-and high-temp heat pump equipment.Wherein, compressor 2, fluid reservoir 3, accessory fan 18 and auxiliary condenser 19 are exposed in environment.The import of compressor 2 communicates with evaporimeter 4 after fluid reservoir 3, and its outlet communicates with condenser 1, auxiliary condenser 19 respectively after two-way valve; The other end of condenser 1, auxiliary condenser 19 communicates with evaporimeter 4 through choke valve, and condenser 1 is configured with main air blower 15, and auxiliary condenser 19 is configured with accessory fan 18.Material frame 8, porous homogenating plate 9, wind deflector 10, Temperature Humidity Sensor 11 be provided with feeding gate 15 is established in dry envelope 12.Be provided with porous homogenating plate 9 in dry envelope 12, form dryness storehouse and two, air channel independently warehouse; Airduct 13 is repeatedly kicked in dry envelope 12 upper end, and communicated with the condenser 1 of middle-and high-temp heat pump equipment by charged three ventilation ducts of dynamic temperature humid control air-valve 14, dry envelope 12 lower end is connected discharge pipe 7 and is communicated with the evaporimeter 4 of middle-and high-temp heat pump equipment by charged three ventilation ducts of dynamic temperature humid control air-valve 6, and forms loop.
When inventive closure is dry, first feeding gate 15 is opened, material is placed on material frame 8, shut feeding gate 15, close the electronic Temperature and Humidity Control air-valve 6 and electronic Temperature and Humidity Control air-valve 14 that communicate with the external world.After heat pump drying temperature is set, switch on power, can start to carry out drying to material.In dry run, the drying medium (air) that dryness storehouse discharge pipe 7 temperature is out lower, relative humidity is larger is via after triple valve 6, carry out heat exchange with evaporimeter 4, complete the dehumidifying of air and the recovery of latent heat, the condensed water dehumidified is collected by water-collecting tray 5 and is drained into environment; The air that relative humidity is lower is heated when condenser 1, becomes the dry gas of higher temperature.The dry gas that temperature is higher, relative humidity is lower is by main air blower 15, dryness storehouse is blasted through blast pipe 13, and by wind deflector 10, carry out contact drying, matter heat trnasfer through the material on porous homogenating plate 9 pairs of material frames 3, become the air that temperature is lower, relative humidity is larger.And so forth, finally dry materials is realized.Drying completely material is delivered from godown through feeding gate 17.
When the present invention works, when the temperature in dry envelope 12 exceedes the baking temperature of setting, the condenser 1 of middle-and high-temp heat pump equipment quits work, and auxiliary condenser 19, accessory fan 18 are started working, and drain in environment by unnecessary heat; The dehumidification function of heat pump carries out always, and the relative humidity of dry gas remains at low value, can realize the freeze-day with constant temperature of material.
When inventive closure is dry, gradient increased temperature drying mode can be set according to material characteristic, realize material segmented alternating temperature dry.
Inventive closure the later stage of drying, material water capacity declines, and the humidity of dryness storehouse discharge pipe 7 drying medium out declines, and evaporimeter 4 callable heat from drying medium reduces, and the heat pump thermal efficiency declines, and energy-saving effect becomes not obvious.At this moment, electronic Temperature and Humidity Control air-valve 6,14 in part or all of unlatching three ventilation duct, air containing higher levels of humidity in external environment enters middle-and high-temp heat pump equipment from electronic Temperature and Humidity Control air-valve 6 under the effect of main air blower 15, the air lower with water capacity in discharge pipe 7 mixes, after the intensification of the wet down of evaporimeter 5, condenser 1, the air of part high temperature, low humidity enters dryness storehouse dried material through blast pipe 13, and partial air drains into environment through electronic Temperature and Humidity Control air-valve 14.Wet down (condensation heat) process from external environment humid air is that heat pump brings new origin of heat, improves the thermal efficiency of system.
In the open drying system of the present invention, the change of electronic Temperature and Humidity Control air-valve 6,14 aperture can be the humidity change that drying system provides controlled, and the change realizing material is wet dry.
Claims (3)
1. a moderate and high temperature heat alternating temperature drying device, be made up of middle-and high-temp heat pump equipment, dry envelope, wind deflector, porous homogenating plate, electronic Temperature and Humidity Control air-valve, three ventilation ducts, in dry envelope, establish material frame, wind deflector, Temperature Humidity Sensor be provided with feeding gate; It is characterized in that, in dry envelope, be provided with porous homogenating plate, form dryness storehouse and two, air channel independently warehouse; Airduct is repeatedly kicked in dry envelope upper end, and communicated with middle-and high-temp heat pump equipment by three ventilation ducts of charged dynamic temperature humid control air-valve, dry envelope lower end is connected discharge pipe and is communicated with middle-and high-temp heat pump equipment by three ventilation ducts of charged dynamic temperature humid control air-valve, and forms loop.
2. moderate and high temperature heat alternating temperature drying device according to claim 1, it is characterized in that, by condenser, auxiliary condenser, choke valve, evaporimeter, fluid reservoir, middle high temperature compressor, two-way valve by after copper pipe connects successively and main air blower, accessory fan, water-collecting tray be placed in heat pump casing and form middle-and high-temp heat pump equipment; Wherein, compressor, accessory fan and auxiliary condenser are exposed in environment; The import of compressor communicates with evaporimeter after fluid reservoir, and its outlet communicates with condenser, auxiliary condenser respectively after two-way valve; The other end of condenser, auxiliary condenser communicates with evaporimeter through choke valve, and condenser arrangement main air blower, auxiliary condenser is configured with accessory fan.
3. moderate and high temperature heat alternating temperature drying device according to claim 1, it is characterized in that, blast pipe is communicated with the condenser of middle-and high-temp heat pump equipment by three ventilation ducts of charged dynamic temperature humid control air-valve, and discharge pipe is also communicated with the evaporimeter of middle-and high-temp heat pump equipment by three ventilation ducts of charged dynamic temperature humid control air-valve.
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| CN201510204796.7A CN104807318A (en) | 2015-04-28 | 2015-04-28 | Variable-temperature drying device of medium and high temperature heat pump |
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| CN201510204796.7A CN104807318A (en) | 2015-04-28 | 2015-04-28 | Variable-temperature drying device of medium and high temperature heat pump |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106123504A (en) * | 2016-06-29 | 2016-11-16 | 田阳果香园食品工业有限公司 | Preserved fruit drying unit and drying room thereof |
| CN106123512A (en) * | 2016-07-04 | 2016-11-16 | 苏州北开生化设备有限公司 | The heated-air circulation oven of a kind of quantity-adjustable and using method thereof |
| CN106115154A (en) * | 2016-06-16 | 2016-11-16 | 枞阳县翠平生态综合养殖场 | A kind of multi-functional pig feed storage silo |
| CN106766722A (en) * | 2016-12-27 | 2017-05-31 | 浙江省能源与核技术应用研究院 | Graininess agriculture and forestry product heat pump drying storage one storehouse |
| CN108981316A (en) * | 2018-06-14 | 2018-12-11 | 中国航天员科研训练中心 | Plant drying unit and method in a kind of closed environment system |
| CN115448566A (en) * | 2022-09-02 | 2022-12-09 | 广州市新之地环保产业股份有限公司 | Novel sludge low-temperature drying system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106115154A (en) * | 2016-06-16 | 2016-11-16 | 枞阳县翠平生态综合养殖场 | A kind of multi-functional pig feed storage silo |
| CN106123504A (en) * | 2016-06-29 | 2016-11-16 | 田阳果香园食品工业有限公司 | Preserved fruit drying unit and drying room thereof |
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| CN106766722B (en) * | 2016-12-27 | 2022-07-29 | 浙江省能源与核技术应用研究院 | Granular agricultural and forestry product heat pump drying and storing integrated bin |
| CN108981316A (en) * | 2018-06-14 | 2018-12-11 | 中国航天员科研训练中心 | Plant drying unit and method in a kind of closed environment system |
| CN108981316B (en) * | 2018-06-14 | 2020-09-01 | 中国航天员科研训练中心 | Plant drying device and method in closed environment system |
| CN115448566A (en) * | 2022-09-02 | 2022-12-09 | 广州市新之地环保产业股份有限公司 | Novel sludge low-temperature drying system |
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