CN103471374B - Solar-assisted heat pump drying system - Google Patents

Solar-assisted heat pump drying system Download PDF

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Publication number
CN103471374B
CN103471374B CN201310453060.4A CN201310453060A CN103471374B CN 103471374 B CN103471374 B CN 103471374B CN 201310453060 A CN201310453060 A CN 201310453060A CN 103471374 B CN103471374 B CN 103471374B
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heat
packed tower
air
type packed
solar energy
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CN103471374A (en
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李永存
熊慧灵
高旭
林爱晖
邹声华
王海桥
王卫军
刘荣华
刘何青
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Hunan University of Science and Technology
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Hunan University of Science and Technology
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Abstract

The present invention discloses a kind of solar-assisted heat pump drying system.The present invention includes hothouse, heat pump, also comprise solar energy solution regenerator, interior heat/heat insulating dual purpose type packed tower and heat insulation-type packed tower; The invention provides a kind of Analysis of Heat Pump Drying System that can make full use of solar energy in annual Various Seasonal, utilize solar energy heat the weak solution after dehumidifying and regenerate when solar energy is abundant, utilize heat pump to be aided with solar energy when solar energy is not enough and realize dehumidifying to air and heating process, ensure that system can the operation of efficient stable.When adopting solution dehumidification mode, solution directly contacts with air, and heat transfer temperature difference is little, and irreversible loss is less, can solve the larger problem of energy consumption that traditional condensation dehumidification mode exists; Meanwhile, the heat that regeneration of waste liquor heat and part add hot-air comes from solar energy, and this part energy can gratuitously utilize, and makes this system energy-saving effect when whole year operation remarkable.

Description

Solar-assisted heat pump drying system
Technical field
The invention belongs to drying system technical field, be specifically related to a kind of solar-assisted heat pump drying system utilizing solution dehumidification/heating technique.
Background technology
Effectively can recycle the heat in air due to heat pump drier, therefore its utilization is more and more extensive.In heat pump drier hothouse, dried air humidity carried out to material larger, traditional heat pump drier adopts the method for dehumidification by condensation to dehumidify to air: first through evaporator with heat pump, air themperature is reduced to below dew-point temperature from hothouse humid air out and separates out steam, and then carries out drying to the last hothouse of sending into that heats up of the dry air after dehumidifying to material through heat pump condenser.Humid air like this needs first through evaporator cooling, then heats up through condenser, and cause certain energy loss, and when heat pump dehumidifies to wet air condensation, evaporating temperature need reach below air dew point temperature, therefore heat pump COP is lower.
When humid air directly contacts with solution, heat transfer temperature difference is therebetween little, and during dehumidifying, its dehumidification rate is high, and solution also has and catches the advantage such as dirt, sterilization and can carry out purified treatment to air; And the regeneration of solution and endothermic process can utilize this renewable and clean energy resource of solar energy to realize.
Summary of the invention
The object of the invention is to for the problem that conventional heat pump drying system energy consumption is comparatively large and heat pump COP is lower, a kind of solar-assisted heat pump drying system is provided, this system utilizes solar energy heat up to solution and regenerate, and solution is then used for dehumidifying and adding hot-air.
The object of the invention is to realize by the following technical solutions: this solar-assisted heat pump drying system, comprises hothouse, is connected to the heat pump between the exhaust outlet of hothouse and air inlet by air duct; Described heat pump comprises evaporimeter, condenser, compressor and throttling arrangement, and the air inlet of described hothouse is provided with blower fan; Be characterized in: it also comprises solar energy solution regenerator, interior heat/heat insulating dual purpose type packed tower and heat insulation-type packed tower; The taphole of described solar energy solution regenerator is connected with interior heat/heat insulating dual purpose type packed tower and heat insulation-type packed tower successively by solution line, and the taphole of heat insulation-type packed tower is connected with the solution inlet port of solar energy solution regenerator again; The exhaust outlet of described hothouse is also connected with heat insulation-type packed tower and Nei Re/heat insulating dual purpose type packed tower successively by air duct, and the exhaust outlet of interior heat/heat insulating dual purpose type packed tower is connected with the air inlet of hothouse again; The exhaust outlet of described heat insulation-type packed tower is also connected on the air inlet of heat pump condenser simultaneously, and the gas outlet of heat pump condenser is connected with the air inlet of hothouse; The solution inlet port of described solar energy solution regenerator and the solution line of taphole are separately installed with magnetic valve; On two branching air pipelines of described hothouse exhaust outlet and on two branching air pipelines of hothouse air inlet, on two branching air pipelines of the exhaust outlet of described heat insulation-type packed tower, two branching air pipelines of the air inlet of described heat pump condenser are separately installed with air-valve.
Specifically, described interior heat/heat insulating dual purpose type packed tower is on the basis of heat insulation-type packed tower, in tower, coil pipe is installed, the refrigerant inlet of coil pipe is connected with heat pump compressor by refrigerant tubing with refrigerant outlet, and the refrigerant inlet of coil pipe and the refrigerant tubing of refrigerant outlet are separately installed with magnetic valve; The top of interior heat/heat insulating dual purpose type packed tower is provided with exhaust outlet, and exhaust outlet is provided with air-valve, and the bottom air inlet mouth of interior heat/heat insulating dual purpose type packed tower is also provided with air duct and atmosphere, and this air duct is provided with air-valve.
Solar-assisted heat pump drying system of the present invention, in the solar energy abundant period, can adopt solution in hothouse, the humid air after dry materials is dehumidified and to dehumidifying after air heat, then utilize solar energy realization to the regeneration of solution and intensification, the coil pipe internal cause in interior heat now/heat insulating dual purpose type packed tower inputs without hot fluid therefore is heat insulation-type packed tower; In transition season or the relatively high but solar energy of winter temperature not enough period again, adopt solution to dehumidifying to the humid air after dry materials in hothouse and utilizing the condensation heat in heat pump condenser to heat air after dehumidifying, and utilize solar energy to carry out preheating to solution then to enter in interior heat/heat insulating dual purpose type packed tower and regenerate, the coil pipe internal cause in interior heat now/heat insulating dual purpose type packed tower have input the part high temperature refrigerant of compressor outlet therefore is interior pattern of fever packed tower; Temperature solar energy on the low side is without the value period in the winter time, and system is then a traditional Analysis of Heat Pump Drying System.Present system is on the basis of conventional heat pump drying system, and adopt solution dehumidification to combine with dehumidification by condensation, the regeneration of solution and heating process can utilize solar energy, and therefore, relative conventional heat pump drying system, annual energy consumption is less, and efficiency is high.
Operation principle of the present invention and the course of work as follows:
System is when solar energy is abundant, and system cloud gray model comprises hothouse, heat insulation-type packed tower, interior heat/heat insulating dual purpose type packed tower and solar energy solution regenerator.Hothouse realizes the dry run to material, and dried humid air is sent in heat insulation-type packed tower.Heat insulation-type packed tower realizes the dehumidification process to humid air, the solution sent from interior heat/heat insulating dual purpose type packed tower sprays downwards from heat insulation-type packed tower top and directly contacts with the humid air entered from heat insulation-type packed tower bottom, solution and humid air generation caloic exchange, concentrated solution is sent into after becoming weak solution in solar energy solution regenerator, becomes dry air and send in interior heat/heat insulating dual purpose type packed tower after humid air dehumidifying.Interior heat/heat insulating dual purpose type packed tower realizes the heating process to dry air, interior heat/heat insulating dual purpose type packed tower coil pipe valve closing, and not to packed tower transfer heat, therefore now this packed tower is a heat insulation-type packed tower; The solution sent in solar energy solution regenerator is directly sent in interior heat/heat insulating dual purpose type packed tower and is directly contacted with the dry air sent from heat insulation-type filler, the solution temperature sent from solar regenerator is relatively high and drying-air temperature is relatively low, solution can heat dry air in packed tower, dry air after heating is sent into hothouse and is carried out drying to material, and solution continues to be fed into heat insulation-type packed tower and dehumidifies to humid air.Solar regenerator utilizes solar energy to improve solution temperature and realizes the regenerative process to solution.Send into the dehumidifying of heat insulation-type packed tower from hothouse humid air out, the dry air after dehumidifying send in heat/heat insulating dual purpose type packed tower heating, after heating, dry air is sent into hothouse and is continued dry; In solar energy solution regenerator solution out send in heat/heat insulating dual purpose type packed tower to dry air heating, after heating, solution is sent into heat insulation-type packed tower and is dehumidified to humid air, and after dehumidifying, solution sends into the regeneration of solar energy solution regenerator, so forms circulation.
System at transition season or winter temperature higher period but solar energy is not enough again, system cloud gray model comprises hothouse, heat insulation-type packed tower, interior heat/heat insulating dual purpose type packed tower, solar energy solution regenerator and heat pump.Hothouse realizes the dry run to material, and dried humid air is sent in heat insulation-type packed tower.Heat insulation-type packed tower realizes the dehumidification process to humid air, the solution sent from interior heat/heat insulating dual purpose type packed tower sprays downwards from heat insulation-type packed tower top and directly contacts with the humid air entered from heat insulation-type packed tower bottom, solution and air generation caloic exchange, concentrated solution is sent into after becoming weak solution in solar energy solution regenerator, becomes dry air and send in heat pump condenser after humid air dehumidifying.Interior heat/heat insulating dual purpose type packed tower realizes the regenerative process to solution, because this period solar energy cannot provide required regeneration of waste liquor heat, so utilize heat pump compressor exit portion high temperature refrigerant to carry out compensational regeneration heat, in interior heat/heat insulating dual purpose type packed tower, realize the regenerative process to solution.Interior heat/heat insulating dual purpose type packed tower coil pipe valve open, the part high temperature refrigerant at input compressor outlet place in coil pipe, therefore now this packed tower is an interior pattern of fever packed tower.The solution sent in solar energy solution regenerator is sent in interior heat/heat insulating dual purpose type packed tower, exchange with the air generation caloic sending into packed tower, weak solution is sent into after becoming concentrated solution in heat insulation-type packed tower, and return compressor after the cold-producing medium cooling in coil pipe, air directly enters in air.The heat that heat pump produces, a part is delivered to interior heat/heat insulating dual purpose type packed tower to realize the regenerative process to solution, and a part realizes the heating process to dry air in condenser.Now heat pump does not need to carry out dehumidification by condensation to humid air, so heat pump can adopt higher evaporating temperature, this makes the COP of heat pump significantly improve.Solar regenerator utilizes solar energy to realize warm to solution, and in heat insulation-type packed tower, weak solution is out first by heat/heat insulating dual purpose type packed tower in sending into again after the preheating of solar energy solution regenerator.Send into heat insulation-type packed tower from hothouse humid air out to dehumidify to air, the dry air after dehumidifying sends into heat pump condenser heating, and after heating, dry air is sent into hothouse and continued dry; Solution in solar energy solution regenerator after preheating is sent in interior heat/heat insulating dual purpose type packed tower and is regenerated, and then solution feeding heat insulation-type packed tower dehumidifies to humid air, and after dehumidifying, solution sends into the preheating of solar energy solution regenerator, so forms circulation.
System is when temperature solar energy on the low side is without value in the winter time, and system running pattern is a traditional Analysis of Heat Pump Drying System, and adopt the method for dehumidification by condensation to dehumidify to air, system cloud gray model comprises hothouse and heat pump.First cool-down dehumidification is carried out through evaporator with heat pump from hothouse humid air out, air after cool drying is sent in heat pump condenser again, low temperature dry air absorption refrigeration agent within the condenser condensation time the heat that discharges, become dry hot-air, send into hothouse by blower fan again, so form circulation.
Accompanying drawing explanation
Fig. 1 is the system principle structural representation of the embodiment of the present invention.
Theory structure schematic diagram when Fig. 2 is the system summer condition operation of the embodiment of the present invention.
Theory structure schematic diagram when Fig. 3 is system transitions operating mode in the season operation of the embodiment of the present invention.
Theory structure schematic diagram when Fig. 4 is the system winter condition operation of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
See Fig. 1, the present embodiment comprises hothouse 3, heat pump 2 between the exhaust outlet being connected to hothouse 3 by air duct and air inlet; Heat pump 2 comprises evaporimeter 7, condenser 10, compressor 8 and throttling arrangement 9, and the air inlet of hothouse 3 is provided with blower fan 11.As can be seen from Fig. 1, it also comprises solar energy solution regenerator 1, interior heat/heat insulating dual purpose type packed tower 5 and heat insulation-type packed tower 4.The taphole of solar energy solution regenerator 1 is connected with interior heat/heat insulating dual purpose type packed tower 5 and heat insulation-type packed tower 4 successively by solution line, and the taphole of heat insulation-type packed tower 4 is connected with the solution inlet port a of solar energy solution regenerator 1 again.The exhaust outlet of hothouse 3 is also connected with heat insulation-type packed tower 4 and Nei Re/heat insulating dual purpose type packed tower 5 successively by air duct, and the exhaust outlet of interior heat/heat insulating dual purpose type packed tower 5 is connected with the air inlet of hothouse 3 again.The exhaust outlet of heat insulation-type packed tower 4 is also connected on the air inlet of heat pump condenser 10 simultaneously, and the gas outlet of heat pump condenser 10 is connected with the air inlet of hothouse 3.The solution inlet port of solar energy solution regenerator 1 and the solution line of taphole are separately installed with magnetic valve 13 and magnetic valve 12; Be also shown in from Fig. 1, air-valve 16, air-valve 17, air-valve 18, air-valve 19 is separately installed with on two branching air pipelines of hothouse 3 exhaust outlet and on two branching air pipelines of hothouse air inlet, two branching air pipelines of the exhaust outlet of heat insulation-type packed tower 4 are separately installed with air-valve 20, air-valve 21, two branching air pipelines of the air inlet of heat pump condenser 10 are separately installed with air-valve 22, air-valve 23.Solar energy solution regenerator 1 is prior art, is not described in detail in this, and wherein 6 is expressed as blower fan.
See Fig. 1, interior heat/heat insulating dual purpose type the packed tower 5 of the present embodiment is on the basis of heat insulation-type packed tower 4, in tower, coil pipe is installed, the refrigerant inlet of coil pipe is connected with heat pump compressor 8 by refrigerant tubing with refrigerant outlet, and the refrigerant inlet of coil pipe and the refrigerant tubing of refrigerant outlet are separately installed with magnetic valve 14 and magnetic valve 15; The top of interior heat/heat insulating dual purpose type packed tower 5 is provided with exhaust outlet, exhaust outlet is provided with air-valve 25, and the bottom air inlet mouth of interior heat/heat insulating dual purpose type packed tower 5 is also provided with air duct and atmosphere, this air duct is provided with air-valve 24.Heat insulation-type packed tower 4 is prior art, is not described in detail in this.
System is when summer, solar energy abundant period was run, and system magnetic valve 12,13 is opened, magnetic valve 14,15, close; Air-valve 17,18,21 is opened, and air-valve 16,19,20,22,23,24,25 cuts out, and system cloud gray model capital equipment solar energy solution regenerator 1, hothouse 3, heat insulation-type packed tower 4 and Nei Re/heat insulating dual purpose type packed tower 5, system cloud gray model is see Fig. 2.The humid air sent from hothouse 3 is sent in heat insulation-type packed tower 4, in heat insulation-type packed tower 4, humid air and solution generation caloic exchange, humid air dehumidifies further and heat temperature raising in heat/heat insulating dual purpose type packed tower 5 in dehumidified rear feeding in heat insulation-type packed tower 4, and the heated drying air of acquisition sends into hothouse 3 inner drying material.Solution dehumidifies from entering interior heat/heat insulating dual purpose type packed tower 5 pairs of dry air after solar energy solution regenerator 1 is sent and heats, send into the 4 pairs of humid air dehumidifying of heat insulation-type packed tower again, after dehumidifying, solution is sent in solar energy solution regenerator 1, then the air utilizing solar energy and blower fan 6 to send into is to regeneration of waste liquor and promote solution temperature, continue to be fed in interior heat/heat insulating dual purpose type packed tower 5, so form circulation.
System is when the solar energy not enough period is run, and magnetic valve 12,13,14,15 is opened; Air-valve 17,19,20,22,24,25 is opened, air-valve 16,18,21,23 cuts out, system cloud gray model capital equipment solar energy solution regenerator 1, heat pump 2, hothouse 3, heat insulation-type packed tower 4 and Nei Re/heat insulating dual purpose type packed tower 5, system cloud gray model is see Fig. 3.The humid air sent from hothouse 3 enters in heat insulation-type packed tower 4, exchange with solution generation caloic in heat insulation-type packed tower 4, humid air is dehumidified, and the dry air after dehumidifying is sent into heat pump condenser 10 and heated, and the hot dry air after heating is sent in hothouse 3 and continued dried material; Solution send into after preheating in solar energy solution regenerator 1 in heat/heat insulating dual purpose type packed tower 5, then the regenerated heat needed for partial heat compensation in heat pump compressor 8 exit is utilized, solution after regeneration is sent in heat insulation-type packed tower 4 and is dehumidified to humid air, and after dehumidifying, solution sends into solar energy solution regenerator 1; The high temperature refrigerant in heat pump compressor 8 exit is sent in interior heat/heat insulating dual purpose type packed tower 5, returns heat pump compressor 8, so form circulation to cold-producing medium after solution heating.
System is when solar energy ran without the value period, and magnetic valve Close All, air-valve 16,19,23 is opened, and air-valve 17,18,20,21,22,24,25 cuts out.Now the capital equipment of system cloud gray model is heat pump 2 and hothouse 3, and system cloud gray model is see Fig. 4, and now the dehumidification mode of system is traditional dehumidification by condensation mode.The humid air sent from hothouse 3 carries out cool-down dehumidification through evaporator with heat pump 7, air after cool drying is sent in heat pump condenser 9 again, the heat of cold-producing medium in low temperature dry air absorptive condenser, becomes dry hot-air, send into hothouse by blower fan 11 again, so form circulation.

Claims (2)

1. a solar-assisted heat pump drying system, comprises hothouse, is connected to the heat pump between the exhaust outlet of hothouse and air inlet by air duct; Described heat pump comprises evaporimeter, condenser, compressor and throttling arrangement, and the air inlet of described hothouse is provided with blower fan; It is characterized in that: it also comprises solar energy solution regenerator, interior heat/heat insulating dual purpose type packed tower and heat insulation-type packed tower; The taphole of described solar energy solution regenerator is connected with interior heat/heat insulating dual purpose type packed tower and heat insulation-type packed tower successively by solution line, and the taphole of heat insulation-type packed tower is connected with the solution inlet port of solar energy solution regenerator again; The exhaust outlet of described hothouse is also connected with heat insulation-type packed tower and Nei Re/heat insulating dual purpose type packed tower successively by air duct, and the exhaust outlet of interior heat/heat insulating dual purpose type packed tower is connected with the air inlet of hothouse again; The exhaust outlet of described heat insulation-type packed tower is also connected on the air inlet of heat pump condenser simultaneously, and the gas outlet of heat pump condenser is connected with the air inlet of hothouse; The solution inlet port of described solar energy solution regenerator and the solution line of taphole are separately installed with magnetic valve; On two branching air pipelines of described hothouse exhaust outlet and on two branching air pipelines of hothouse air inlet, on two branching air pipelines of the exhaust outlet of described heat insulation-type packed tower, two branching air pipelines of the air inlet of described heat pump condenser are separately installed with air-valve; Described solar-assisted heat pump drying system, in the solar energy abundant period, adopt solution in hothouse, the humid air after dry materials is dehumidified and to dehumidifying after air heat, then utilize solar energy realization to the regeneration of solution and intensification, the coil pipe internal cause in interior heat now/heat insulating dual purpose type packed tower inputs without hot fluid therefore is heat insulation-type packed tower; In transition season or the relatively high but solar energy of winter temperature not enough period again, adopt solution to dehumidifying to the humid air after dry materials in hothouse and utilizing the condensation heat in heat pump condenser to heat air after dehumidifying, and utilize solar energy to carry out preheating to solution then to enter in interior heat/heat insulating dual purpose type packed tower and regenerate, the coil pipe internal cause in interior heat now/heat insulating dual purpose type packed tower have input the part high temperature refrigerant of compressor outlet therefore is interior pattern of fever packed tower; Temperature solar energy on the low side is without the value period in the winter time, and system is then a traditional Analysis of Heat Pump Drying System.
2. solar-assisted heat pump drying system according to claim 1, it is characterized in that: described interior heat/heat insulating dual purpose type packed tower is on the basis of heat insulation-type packed tower, in tower, coil pipe is installed, the refrigerant inlet of coil pipe is connected with heat pump compressor by refrigerant tubing with refrigerant outlet, and the refrigerant inlet of coil pipe and the refrigerant tubing of refrigerant outlet are separately installed with magnetic valve; The top of interior heat/heat insulating dual purpose type packed tower is provided with exhaust outlet, and exhaust outlet is provided with air-valve, and the bottom air inlet mouth of interior heat/heat insulating dual purpose type packed tower is also provided with air duct and atmosphere, and this air duct is provided with air-valve.
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CN104567282B (en) * 2014-12-31 2017-04-19 伯恩太阳能科技有限公司 Intelligent multifunctional drying room
CN107575970A (en) * 2017-08-30 2018-01-12 北京建筑大学 A kind of combined-type water cold air conditioning system and operation method
CN107677010B (en) * 2017-08-30 2020-04-21 北京建筑大学 Air conditioning system without dew point control and control method
CN113154867A (en) * 2021-05-08 2021-07-23 江苏方天电力技术有限公司 Humiture divides accuse gas heat pump drying system

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