WO2017101123A1 - Solar energy heating and drying system and drying method - Google Patents

Abstract

A solar energy heating and drying system and a drying method, the solar-energy heating and drying system comprising a solar energy heat collecting container (1), an apparatus for dehumidifying, heating and returning air (2), a light-transmitting infrared thermal-insulation shield (3) and an auxiliary heating system, wherein the solar energy heat collecting container comprises a container and a heat-absorbing coating applied to the external surface of the container; the apparatus for dehumidifying, heating and returning air is disposed at an end of the solar energy heat collecting container, and is capable of drawing and converting hot humid air from within the solar energy heat collecting container to hot dry air and then discharging the same inside of the solar energy heat collecting container; the light-transmitting infrared thermal-insulation shield is disposed to cover a top surface of the solar energy heat collecting container; and the auxiliary heating system has a heating part which is disposed within the heat collecting container. The solar energy heating and drying system can be easily moved or mounted on a vehicle, has a variety of heating modes, consumes less energy and enjoys high unit productivity efficiency.

Description

Solar heating drying system and drying method Technical field

The invention relates to a drying system, in particular to a solar heating drying system and a drying method.

Background technique

At present, in the prior art, drying equipment for drying seafood, vegetables, fruits, Chinese medicines, and the like mostly uses electric heating, steam heating, or heating of fuel (such as gas, fuel, etc.). The existing drying equipment has defects such as single heating mode, low unit productivity, high energy consumption, inconvenient movement or on-board.

Summary of the invention

The invention provides a solar heating drying system and a drying method, which are used for solving technical defects such as single heating mode, low unit productivity, high energy consumption, inconvenient movement or vehicle loading in the prior art.

The invention provides a solar heating and drying system, which comprises a solar heat collecting box, a moisture discharging and heating return air device, a light transmitting infrared heat insulating cover and an auxiliary heating system.

The solar heat collecting box includes a container, and an outer surface of the container is provided with a heat absorbing coating;

The moisture-discharging heating return air device is disposed at an end of the solar heat collecting box, and is capable of introducing and converting hot moisture inside the solar heat collecting box into hot dry gas and discharging the same to the solar heat collecting box internal;

The transparent infrared heat insulating cover is disposed on a top surface of the solar heat collecting box;

The auxiliary heating system has a heating portion that is disposed inside the container.

In the present invention, the container is a standard-sized container, which may have a size of 20 GP, 40 GP, etc., thereby facilitating on-board movement of the solar heating and drying system. It can be understood that the container should be a closed box with a box door at one end for loading and unloading the goods, and the heat absorbing coating is disposed on both end faces of the container (including the box door) and the two sides. And on the outer surface of the top surface. The endothermic coating of the present invention is used to convert the radiant energy of the sun into heat energy, which can be conventional solar energy in the art. Endothermic coating. The solar heating and drying system of the present invention mainly uses solar energy for heating, so the overall energy consumption is low.

In one embodiment, the endothermic coating layer is a matt coating layer in which endothermic particles are dispersed, the endothermic particles having an irregular shape and having a particle diameter of 400 to 800 mesh. Specifically, the endothermic coating layer may be formed by coating a matt coating containing the endothermic particles on the outer surface of the container. In the present invention, having an irregular shape means that the surface of the endothermic particle has a plurality of corners (i.e., having a polygonal characteristic); and utilizing the polygonal characteristic of the surface of the endothermic particle, it can be in different time periods of the day. Fully absorb the radiant energy of the sun and convert it into heat to heat the container, and the unit productivity is high.

In the present invention, the composition of the matt coating layer is not strictly limited, as long as it can be cured on the outer surface of the container to form a coating; in addition, the material of the endothermic particles is not strictly limited, as long as Materials of the above shape and particle size and capable of converting the radiant energy of the sun into thermal energy are suitable for use in the present invention. In an embodiment, the endothermic particles may be carbon black.

Further, the heat absorbing coating layer may have a thickness of 0.1-0.5 mm; the thickness range is good in heating effect and high in unit productivity.

In the present invention, the moisture-discharging heating return air device is configured to introduce hot moisture inside the solar heat collecting box into a moisture-discharging heating return air device, in which the hot moisture is converted. For hot dry gas, the dehumidification heating return air device discharges the hot dry gas formed by the conversion to the inside of the solar heat collecting box. The moisture-discharging and heating return air device can timely and fully discharge the water vapor inside the solar heat collecting box, and return the hot air with the moisture removed back to the inside of the solar heat collecting box, thereby making the heat inside the solar heat collecting box The air is recycled and energy efficient.

The dehumidification heating return air device of the present invention may be a conventional device such as a dehumidifier or the like in the art. The working principle of the humidifying and heating return air device is:

Internal circulation: discharge high temperature and high pressure gas through the operation of the compressor → exhaust port → enter the condenser to cool → become low temperature and high pressure gas → cut through the capillary → become low temperature and low pressure liquid → evaporate heat through the evaporator → return to compression The machine becomes a low-temperature and low-pressure gas, and so on.

External circulation: in the case of normal starting → through the operation of the fan → high temperature and high humidity air inhaled from the air inlet → through the air cooling and cooling → evaporator → evaporator to adsorb the water in the air on the aluminum sheet → become dry Air → heat is dissipated through the condenser → the heating section becomes high temperature and low humidity air is blown out from the air outlet.

In one embodiment, the dehumidification heating return air device is a high temperature dehumidifier, such as a high temperature dehumidifier produced by Hangzhou Gaozhen Electric Equipment Co., Ltd. The high temperature dehumidifier can use the waste heat in the hot moisture discharged from the solar heat collecting box as a heat source, and absorb heat in the hot air by using the heat absorbing coil, and at the same time make the air more and more dry, with waste heat and dried. The air is heated again by the heat-dissipating coil, and the temperature is getting higher and higher. After reaching the set temperature, the bypass solenoid valve allows the refrigerant to change away from the bypass pipe, and the multi-source heat pump assembly absorbs the heat of the hot air, thereby achieving high efficiency and energy saving.

Further, the high temperature dehumidifier is disposed at an end of the solar heat collecting box, and it can be understood that the high temperature dehumidifier has an air outlet and a return air outlet, and the air outlet and the air return port are The containers are in communication.

The light-transmitting infrared heat-insulating cover of the invention can transmit light and reduce the infrared transmittance, which does not affect the heat collection of the solar heat collecting box, and can also cause the temperature of the surface of the solar heat collecting box to be lost by the influence of air convection. The solar collector box heats up quickly, the heat dissipation rate is slow, and the heat preservation effect is good. The material and shape of the light-transmitting infrared heat-insulating cover are not strictly limited, and may be a conventional heat-insulation cover in the art.

In the present invention, the auxiliary heating system is used for auxiliary heating in the case of insufficient sunshine, etc., which may be conventional heating equipment in the art, such as a fuel heating system, a gas heating system, an electric heating system, a steam heating system, and the like. The setting of the auxiliary heating system makes the solar heating and drying system more diversified and more practical.

In one embodiment, the auxiliary heating system includes a fuel tank, a burner, an induced draft fan, and the heating portion, and the fuel tank, the burner, and the induced draft fan are disposed at an end of the solar heat collecting box.

The heating portion includes a combustion chamber and a heating pipe, the heating pipe has an inlet and an outlet, the inlet is in communication with the combustion chamber, and the outlet is in communication with the draft fan;

The combustor is in communication with the fuel tank and is disposed relative to the combustion chamber.

Further, the heating pipe comprises two communicating folded-shaped heating pipes, and the two folded-shaped heating pipes are respectively disposed on inner walls of both sides of the container. The installation mode has a large heating area, and the heat distribution in the solar heat collecting box is more uniform.

The solar heating and drying system of the present invention further includes a controller electrically connected to the moisture exhaust heating return air device and the auxiliary heating system, respectively. Further, the solar heating and drying system of the present invention may further comprise detecting components for detecting drying parameters, such as temperature sensors, humidity sensors, etc., so as to better perform temperature and humidity inside the solar heat collecting box. Control is beneficial to ensure the drying effect of the material.

The invention also provides a drying method using the solar heating drying system of any of the above.

Specifically, the solar heating and drying system is placed under illumination, and the material to be dried is sent into a solar heat collecting box of the solar heating drying system, and then the dehumidification heating return air device is turned on. Dry the material for drying.

Further, the auxiliary heating system is simultaneously turned on to dry the material to be dried.

The implementation of the present invention has at least the following advantages:

1. The solar heating and drying system of the invention has a simple structure, adopts a standard container as a solar heat collecting box, and is convenient for moving or vehicle moving; and the drying system uses solar energy for heating, and is irradiated by sunlight under sufficient sunshine conditions. It can work, low energy consumption, flexible application, strong adaptability, and no strict requirements on the site.

2. The invention adopts an endothermic particle having an irregular shape as a heat absorbing material, and the surface of the endothermic particle has a polygonal characteristic, and can fully absorb the radiant energy of the sun and convert it into heat energy in different time periods of the day. The container is heated and the unit productivity is high. In addition, the matt coating layer has a weak reflection of light, which is beneficial to the full utilization of solar energy.

3. The solar heating and drying system of the present invention is provided with a moisture-removing heating and returning device, which can timely and fully discharge the water vapor inside the solar heat collecting box, and return the hot air with the moisture removed back to the solar heat collecting unit. Inside the box, the hot air inside the solar collector is recycled, which is energy efficient.

4. The solar heating and drying system of the present invention is provided with a light-transmitting infrared heat-insulating cover, which does not affect the heat collection of the solar heat collecting box, and can also cause the temperature of the surface of the solar heat collecting box to be lost by the influence of air convection, solar energy. The heat collecting box is heated quickly, the heat loss rate is slow, and the heat preservation effect is good.

5. The solar heating and drying system of the present invention is further provided with an auxiliary heating system, which can assist heating in the case of insufficient sunshine, thereby ensuring the normal use of the drying system; the heating system of the whole drying system is diverse and practical. .

DRAWINGS

1 is a schematic structural view of a solar heating and drying system according to an embodiment of the present invention;

2 is a schematic diagram of an explosion structure of a solar heating and drying system according to an embodiment of the present invention.

Description of the reference signs:

1: solar collector box; 11: box door; 2: dehumidification heating return air device; 21: exhaust vent; 22: return air outlet; 3: transparent infrared heat shield; 4: fuel tank; 5: burner; 6: induced draft fan; 7: combustion chamber; 8: heating pipe; 81: first folded-shaped heating pipe; 82: second folded-shaped heating pipe.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the drawings and embodiments of the present invention. It is obvious that the described embodiments are Some embodiments, rather than all of the embodiments, are invented. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Example 1

As shown in FIG. 1 and FIG. 2, the solar heating and drying system of the present invention comprises a solar heat collecting box 1, a moisture-removing heating returning device 2, a light-transmitting infrared heat-insulating cover 3 and an auxiliary heating system, and the solar heat collecting box 1 comprises The container is provided with an endothermic coating on the outer surface of the container; the dehumidification heating return air device 2 is disposed at the end of the solar heat collecting box 1, and can introduce and convert the hot moisture inside the solar heat collecting box 1 into After the hot dry gas is discharged to the inside of the solar heat collecting box 1; the transparent infrared heat insulating cover 3 is disposed on the top surface of the solar heat collecting box 1; the auxiliary heating system has a heating portion, and the heating portion is disposed inside the container.

In the solar heating and drying system of the present invention, the heat absorbing coating is used to convert the radiant energy of the sun into heat energy; the moisture venting heat returning device 2 is used to introduce and convert the hot moisture inside the solar heat collecting box 1 into After the hot dry gas is discharged to the inside of the solar heat collecting box 1; the transparent infrared heat insulating cover 3 is used for reducing the infrared transmittance, so that the temperature of the surface of the solar heat collecting box 1 is not affected by the air convection; the auxiliary heating system is used. Auxiliary heating in the case of insufficient sunshine; etc.; each of the above components may be a conventional component in the art.

Specifically, in the solar heat collecting box 1, the container is a conventional container having a standard size (for example, 20 GP, 40 GP, etc.), which is convenient for vehicle movement. Specifically, the container is a closed box, and one end (first end) is provided with a box door for loading and unloading goods, and the heat absorbing coating is disposed at two end faces of the container (ie, the first end and the second end) ), on the outer surfaces of the two sides and the top surface.

The endothermic coating is a matt coating layer in which endothermic particles are dispersed. The matt coating of the matt coating layer may be matt lacquer, etc., and the degree of reflection to light is weak, which is beneficial to the full utilization of solar energy; the endothermic particles may be carbon black having an irregular shape and having a particle diameter of 400-800 mesh. The surface of the endothermic particle has a plurality of angular edges (ie, having multi-edge characteristics), and by utilizing the polygonal characteristic of the surface of the endothermic particle, the radiant energy of the sun can be fully absorbed and converted into heat energy in different time periods of the day. The container is heated and the unit productivity is high.

Further, the heat absorbing coating layer may be formed by coating a matt paint containing the above heat absorbing particles on the outer surface of the container, and the heat absorbing coating layer may have a thickness of 0.1-0.5 mm, and the thickness range is good in heating effect. Unit productivity is high.

The moisture-removing and heating return air device 2 is a high-temperature dehumidifier produced by Hangzhou Gaozhen Electric Equipment Co., Ltd., which can use the waste heat in the hot moisture discharged from the solar heat collecting box 1 as a heat source, and absorb the hot air by the heat absorbing coil. The heat, while making the air more and more dry, with the waste heat and the dried air is heated again by the heat sink coil, the temperature is getting higher and higher, after reaching the set temperature, the bypass solenoid valve allows the refrigerant to bypass the bypass The tube, multi-source heat pump assembly absorbs the heat of the hot air, thereby achieving high efficiency and energy saving.

The high temperature dehumidifier can be disposed at the end of the solar heat collecting box 1 (the second end end), and the high temperature dehumidifier has the air exhaust port 21 and the return air outlet 22, and the air exhaust port 21 and the return air outlet 22 communicate with the container, and the solar energy The hot moisture inside the heat collecting box 1 is introduced into the high temperature dehumidifier through the exhaust port 21, and after the dehumidification treatment and the temperature rise, the hot dry gas is discharged from the return air port 22 to the inside of the solar heat collecting box 1.

The light-transmitting infrared heat-insulating cover 3 is a heat-insulating cover that transmits light and can reduce the infrared transmittance, and the shape and material thereof are not strictly limited. The transparent infrared heat preservation cover 3 neither affects the heat collection of the solar heat collecting box 1, but also causes the temperature of the surface of the solar heat collecting box 1 to be lost by the influence of air convection, and the solar heat collecting box 1 heats rapidly and the heat dissipation speed is lost. Slow, good insulation effect.

The auxiliary heating system may be, for example, a conventional heating system such as a fuel heating system, a gas heating system, an electric heating system, or a steam heating system. The setting of the auxiliary heating system makes the solar heating and drying system more diversified and more practical.

In an embodiment, the auxiliary heating system includes a fuel tank 4, a burner 5, an induced draft fan 6 and a heating portion, and the fuel tank 4, the burner 5 and the induced draft fan 6 are disposed at the end of the solar heat collecting box 1 (the second end) Ends). The heating portion includes a combustion chamber 7 having an inlet and an outlet, an inlet communicating with the combustion chamber 7, and an outlet communicating with the draft fan 6; the burner 5 is in communication with the fuel tank 4 and disposed relative to the combustion chamber 7.

In the above auxiliary heating system, the burner 5 is capable of causing the fuel and air in the fuel tank 4 to be ejected in a certain manner and mixedly combusted in the combustion chamber 7; the hot gas generated by the combustion enters from the inlet of the heating duct 8, thereby collecting the solar energy The hot box 1 is heated, and the cold air formed after the heating is discharged from the outlet of the heating duct 8 via the draft fan 6. Further, the heating duct 8 comprises two communicating retracting heating tubes, namely a first retracting heating tube 81 and a second refraction heating tube 82, which are respectively disposed on the inner walls of both sides of the container. The installation mode has a large heating area, and the heat can be distributed more evenly in the solar heat collecting box 1.

Further, the solar heating and drying system further includes a controller (not shown), and the controller is electrically connected to the moisture-dissipating heating return air device 2 and the auxiliary heating system, respectively. The solar heating and drying system may further include a detecting component for detecting the drying parameter, such as a temperature sensor, a humidity sensor, etc., so that the temperature and humidity inside the solar heat collecting box 1 can be better controlled, which is beneficial to Ensure the drying effect of the material.

The above-mentioned solar heating and drying system has a simple structure, and is mainly heated by solar energy, has low energy consumption, and has high unit productivity, and adopts a standard container as a solar heat collecting box, which is convenient for moving or moving in a vehicle; a humidifying and heating return air device 2 The water vapor in the hot moisture inside the solar heat collecting box 1 can be exhausted in time and the heat in the hot moisture can be recycled, and the energy is saved efficiently;

The transparent infrared heat preservation cover 3 can avoid heat loss, so that the solar heat collecting box 1 is heated rapidly, the heat dissipation speed is slow, and the heat preservation effect is good; the auxiliary heating system can assist heating in the case of insufficient sunshine, and the heating mode of the whole drying system Diverse and practical.

Example 2

The drying method of the present invention is carried out using the solar heating and drying system of the first embodiment.

Specifically, under the condition that the solar light is sufficient, the solar heating and drying system of Embodiment 1 is placed under the sun, the material to be dried is sent into the solar heat collecting box 1, and the box door 11 is closed to make the solar heat collecting box. 1 is closed, the heat absorbing coating on the outer surface of the container absorbs heat and dries the material to be dried in the solar heat collecting box 1; at the same time, the moisture venting and returning air device 2 is turned on, and the required drying is adjusted. After the dry temperature, the hot moisture generated inside the solar heat collecting tank 1 is introduced into the moisture-discharging and heating return air device 2 through the air exhaust port 21, and after the dehumidification treatment and the temperature rise, the hot dry gas is discharged from the return air outlet 22 to the solar heat collecting box. 1 internal, so as to jointly dry the material; under the condition that the sunshine is insufficient to reach the drying temperature, the auxiliary heating system can be turned on for heating, and the solar collector is controlled by the controller. The temperature and humidity inside the box 1 are up to the preset drying conditions until the material to be dried reaches the drying requirement.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims (12)

A solar heating and drying system, comprising: a solar heat collecting box, a moisture exhausting heating return air device, a light transmitting infrared heat insulating cover and an auxiliary heating system, The solar heat collecting box includes a container, and an outer surface of the container is provided with a heat absorbing coating; The moisture-discharging heating return air device is disposed at an end of the solar heat collecting box, and is capable of introducing and converting hot moisture inside the solar heat collecting box into hot dry gas and discharging the same to the solar heat collecting box internal; The transparent infrared heat insulating cover is disposed on a top surface of the solar heat collecting box; The auxiliary heating system has a heating portion that is disposed inside the container. The solar heating and drying system according to claim 1, wherein the heat absorbing coating layer is a matt paint layer in which endothermic particles are dispersed, and the heat absorbing particles have an irregular shape and a particle diameter of 400-800 mesh. The solar heating and drying system according to claim 2, wherein the endothermic particles are carbon black. The solar heating and drying system according to any one of claims 1 to 3, wherein the heat absorbing coating has a thickness of 0.1 to 0.5 mm. The solar heating and drying system according to claim 1, wherein the moisture-discharging and heating return air device is a high-temperature dehumidifier, and the high-temperature dehumidifier is disposed at an end of the solar heat collecting box. The high temperature dehumidifier has an air outlet and a return air outlet, and the air outlet and the air return port are in communication with the container. The solar heating and drying system according to claim 1, wherein the auxiliary heating system is a fuel heating system or a gas heating system. A solar heating and drying system according to claim 1 or claim 6, wherein said auxiliary heating system comprises a fuel tank, a burner, an induced draft fan and said heating portion, said fuel tank, burner and induced draft fan arrangement At the end of the solar collector, The heating portion includes a combustion chamber and a heating pipe, the heating pipe has an inlet and an outlet, the inlet is in communication with the combustion chamber, and the outlet is in communication with the draft fan; The combustor is in communication with the fuel tank and is disposed relative to the combustion chamber. The solar heating and drying system according to claim 7, wherein the heating pipe comprises two communicating folded-shaped heating pipes, and the two folded-shaped heating pipes are respectively disposed in the assembly The inner walls of the sides of the box. A solar heating and drying system according to any one of claims 1 to 8, further comprising a controller electrically connected to said dehumidification heating return air device and said auxiliary heating system, respectively. A drying method characterized by using the solar heating and drying system according to any one of claims 1 to 9. The drying method according to claim 10, wherein the solar heating and drying system is placed under illumination, and the material to be dried is sent into a solar heat collecting box of the solar heating drying system, and then opened. The moisture-discharging heating and returning device dries the material to be dried. The drying method according to claim 11, wherein the auxiliary heating system is simultaneously turned on to dry the material to be dried.

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