A heat pump type humidification-dehumidification seawater desalination and heating combined system

Abstract

The present invention discloses a heat pump type humidification-dehumidification seawater desalination and heating composite system. The composite system includes a fan, a humidifier, a heat pump unit, a seawater original water tank, a primary dehumidifier, a secondary dehumidifier, and a seawater heater. In the air flow direction, the fan, the humidifier, the primary dehumidifier, and the secondary dehumidifier are connected in sequence. In the seawater flow direction, the seawater original water tank, the primary dehumidifier, the seawater heater, and the humidifier are connected in sequence. A heat pump unit is connected between the seawater heater and the secondary dehumidifier. A branch is respectively arranged before and after the humidifier, and the two branches are combined and used to connect to the building interior for humidification. One end of the heat pump unit recovers the heat in the secondary dehumidifier through heat exchange. The other end of the heat pump unit uses the heat through heat exchange to heat the seawater in the seawater humidifier and for heating the building interior. The present invention makes full use of energy while reducing cost expenditure.

Description

Technical Field

[0001] The present invention relates to the cross - field of seawater desalination technology, heat pump technology and air - conditioning technology, and particularly relates to a heat - pump type humidification - dehumidification seawater desalination and winter indoor constant temperature and humidity system applicable to the northern coastal areas. Background Art

[0002] The humidification - dehumidification seawater desalination device has the advantages of small floor area, easy operation and maintenance, and good compatibility with renewable energy, and can better adapt to the situation where the fresh - water demand distribution in islands is scattered and the target output is low. Among various humidification - dehumidification seawater desalination devices, the heat - pump type humidification - dehumidification seawater desalination device can comprehensively utilize the heat and cold provided by the heat pump and meet the requirement of all - weather operation, so it has been widely studied recently.

[0003] Most of the heating buildings in winter in the north of China have too low relative humidity of indoor air, while in the south in winter, the indoor humidity is too high and the temperature is relatively low. It can be seen that in winter in China, whether in the north or in the south, there are problems of low human comfort. Using a humidifier indoors in the north often causes the indoor temperature to drop because the fog water in the humidifier absorbs heat, failing to achieve the effect of the humidifier while reducing the indoor temperature; while in the south, because the environmental temperature is not as low as that in the north, using heating will lead to an increase in living costs, so heating is used less.

[0004] How to use the heat and cold provided by the heat - pump type humidification - dehumidification seawater desalination device to provide appropriate indoor humidity and temperature, not only improve the energy utilization rate, but also improve the accommodation environment quality in the north and the south, is a new research direction in the field of seawater desalination. Summary of the Invention

[0005] Aiming at the problems in the prior art, the present invention discloses a heat - pump type humidification - dehumidification seawater desalination and heating composite system. The composite system of the present invention can not only desalinate seawater all day long, but also utilize the energy provided by the heat - pump type humidification - dehumidification seawater desalination device to humidify and heat the indoor environment in winter; and can make the indoor heating temperature and humidity match, maintaining a certain humidity while maintaining the indoor temperature, so as to provide a comfortable living environment.

[0006] The present invention is realized through the following technical solutions:

[0007] A heat - pump type humidification - dehumidification seawater desalination and heating composite system provided by the present invention, the composite system includes a fan, a humidifier, a heat - pump unit, a seawater raw - water tank, a primary dehumidifier, a secondary dehumidifier, and a seawater heater;

[0008] In the air flow direction, the fan, humidifier, primary dehumidifier, and secondary dehumidifier are connected in sequence;

[0009] In the sea water flow direction, the sea water original water tank, primary dehumidifier, sea water heater, and humidifier are connected in sequence;

[0010] A heat pump unit is connected between the sea water heater and the secondary dehumidifier;

[0011] A branch is provided respectively before and after the humidifier, and the two branches are merged and then connected to the building interior for humidification;

[0012] One end of the heat pump unit recovers heat from the secondary dehumidifier through heat exchange; the other end of the heat pump unit uses heat through heat exchange to heat the sea water in the sea water humidifier and for heating the building interior.

[0013] With the above design of the present invention, in this system, the pump-type humidification-dehumidification sea water desalination device can not only desalinate sea water to continuously provide fresh water; it can also utilize the energy provided by the heat pump-type humidification-dehumidification sea water desalination device to obtain hot water for heating the building. And part of the high-temperature and high-humidity air used for desalinating sea water can be mixed with the air generated by the fan and used for humidifying the building interior, thus making full use of energy and reducing the living cost. In this system, the heated sea water flows into the humidifier and undergoes heat exchange with the air generated by the fan to form high-temperature and high-humidity air; part of the high-temperature and high-humidity air is mixed with the air generated by the fan and used for humidifying the building interior, and the other part is used for heat exchange with low-temperature sea water in the primary dehumidifier to desalinate sea water. The high-temperature and high-humidity air with remaining heat in the primary dehumidifier enters the secondary dehumidifier for further heat recovery. The heat pump unit recovers the heat in the secondary dehumidifier through heat exchange while desalinating sea water, and the heat pump unit also uses heat through heat exchange for heating the building interior and heating the sea water in the sea water humidifier. The mixing of the high-temperature and high-humidity air and the air generated by the fan is beneficial to reducing the temperature of the high-temperature and high-humidity air, so that the moisture in the room after humidification will not evaporate rapidly due to too high a temperature; although there will be a temperature difference between the formed high-temperature and high-humidity air and the heating, the humid air with a certain temperature will not cause a significant drop in the indoor temperature of the house due to water evaporation, thus maintaining a living environment with a certain temperature and humidity indoors, and improving the comfort of the living conditions.

[0014] As a further solution, the heat pump unit includes a heat pump evaporator, a heat pump condenser, a throttle valve, and a compressor; the secondary dehumidifier and the heat pump evaporator are connected in sequence to form a closed-loop chilled water circulation pipeline; the heat pump evaporator, the compressor, the heat pump condenser, and the throttle valve are connected in sequence to form a closed-loop refrigerant circulation pipeline; the heat pump condenser and the seawater heater are connected in sequence to form a closed-loop cooling water circulation pipeline; the chilled water circulation pipeline and the refrigerant circulation pipeline are respectively connected through two independent heat exchange pipelines in the heat pump evaporator; the refrigerant circulation pipeline and the cooling water circulation pipeline are respectively connected through two independent heat exchange pipelines in the heat pump condenser; the cooling water circulation pipeline and the seawater circulation pipeline are respectively connected through two independent heat exchange pipelines in the seawater humidifier. Three closed-loop circulation pipelines are formed in the heat pump unit. Through the cooperation of the three closed-loop circulation pipelines, not only can the heat recovered in the secondary dehumidifier be fully utilized, but also the heat generated in the heat pump unit can be further transferred, thereby promoting the sustainability of the system of the present invention while heating, desalinating seawater, and humidifying the house.

[0015] As a further solution, the composite system further includes a first circulation pump and a second circulation pump; in the flow direction of the chilled water in the chilled water circulation pipeline, the second circulation pump is arranged behind the secondary dehumidifier and in front of the heat pump evaporator; in the flow direction of the cooling water in the cooling water circulation pipeline, the first circulation pump is arranged behind the heat pump condenser and in front of the seawater humidifier. It is used for the circulating flow of chilled water and cooling water in the circulation pipeline.

[0016] As a further solution, the composite system further includes a seawater pump; the seawater pump is arranged between the seawater original water tank and the primary dehumidifier. It can be used to pump the seawater in the seawater original water tank into the primary dehumidifier.

[0017] As a further solution, the composite system further includes a fresh water tank; the fresh water tank is respectively connected to the primary dehumidifier and the secondary dehumidifier. In the present invention, the same fresh water tank can be used, or two fresh water tanks can be used, and finally the fresh water in the two fresh water tanks is combined for use.

[0018] As a further solution, the composite system further includes a first three-way valve and a second three-way valve; the first three-way valve is arranged between the humidifier and the primary dehumidifier; the second three-way valve is arranged between the first circulation pump and the seawater heater. The first three-way valve ensures that indoor humidification and seawater desalination are carried out simultaneously, and the second three-way valve ensures that indoor heating and continuous seawater desalination are carried out simultaneously.

[0019] As a further solution, the secondary dehumidifier is further provided with an air outlet, and the air outlet is provided with a grille. It is used to discharge the air after heat exchange in the secondary dehumidifier.

[0020] As a further solution, the humidifier is a countercurrent packing humidifier, which can fully increase the heat exchange area and time between the hot seawater and air, and improve the heat transfer efficiency.

[0021] As a further solution, the material of the fresh water tank is PVC material; the material of the air supply grille is PVC material.

[0022] The present invention also provides a method for heating and humidifying a building interior using the above composite system. The method includes that a part of the air generated by the fan forms high-temperature and high-humidity air through heat exchange with the seawater in the humidifier, and a part of the high-temperature and high-humidity air obtains fresh water by heat exchange with the low-temperature seawater from the seawater original tank. The remaining high-temperature and high-humidity air after separating the fresh water is then recovered for heat at one end of the heat pump unit through heat exchange;

[0023] Another part of the air generated by the fan is mixed with another part of the high-temperature and high-humidity air for humidifying the building interior;

[0024] One end of the heat pump unit recovers the heat of the remaining high-temperature and high-humidity air after separating the fresh water through heat exchange, and the other end of the heat pump unit uses the heat for heating the seawater in the seawater humidifier and for heating the building interior through heat exchange;

[0025] The low-temperature seawater from the seawater original tank flows to the seawater humidifier to be heated again after obtaining heat through heat exchange with the high-temperature and high-humidity air, and then flows to the humidifier to conduct heat exchange with the air generated by the fan. The seawater after heat exchange finally flows out of the humidifier.

[0026] In the system of the present invention, the air generated by the fan undergoes heat exchange with the humidifier to generate high-temperature and high-humidity air. The high-temperature and high-humidity air undergoes heat exchange in the primary dehumidifier and the secondary dehumidifier respectively, thereby forming two parts of fresh water. Such partitioned heat exchange can not only make full use of the energy in the air, desalinate more seawater, but also is conducive to providing sufficient continuous heat sources for heating the room interior. Through the heat exchange process of the heat pump unit, firstly, the heat of the high-temperature and high-humidity air can be fully utilized. Secondly, through the above heat exchange, the outlet water temperature of the high-temperature cooling water can reach 35°C - 55°C. The cooling water within this temperature range is more conducive to the comfort of house heating and is more suitable for matching with the air after mixing the high-temperature and high-humidity air and the air generated by the fan, so that a certain humidity and temperature can be maintained inside the house, thereby improving the comfort inside the house. The heat pump unit provides the heat source for the system of the present invention, and a part of the cooling water that has obtained heat is also used for heating the seawater in the seawater heater, which is conducive to promoting the continuous seawater desalination of the system.

[0027] As a further solution, the chilled water in the chilled water circulation pipeline formed by the heat pump evaporator and the secondary dehumidifier in the heat pump unit recovers the heat in the secondary dehumidifier through heat exchange in the secondary dehumidifier; the refrigerant in the refrigerant circulation pipeline formed by the heat pump evaporator, compressor, heat pump condenser, and throttle valve in the heat pump unit obtains the heat of the chilled water through heat exchange with the chilled water that has obtained heat in the heat pump evaporator, and the refrigerant that has obtained heat is reheated in the compressor; the cooling water in the cooling water circulation pipeline formed by the heat pump condenser and the seawater humidifier obtains the heat of the refrigerant through heat exchange in the heat pump condenser, and the heated cooling water is respectively used for heating in the building interior and heating the seawater in the seawater humidifier. By forming three circulating pipelines, the heat pump unit can not only recover heat but also provide the heat source for the entire system. It is beneficial to the full utilization of energy, reduces energy waste, and is also conducive to the continuous seawater desalination, heating, and humidification in the building interior.

[0028] As a further solution, the method can control the temperature of the high-temperature and high-humidity air flowing into the primary dehumidifier to be 33 - 53 °C and the humidity to be not less than 95%; the temperature of the chilled water in the chilled water circulation pipeline after obtaining the heat in the secondary dehumidifier through heat exchange is 15 °C - 25 °C; the temperature of the cooling water in the cooling water circulation pipeline before using the heat of the cooling water to heat the seawater in the seawater humidifier through heat exchange is 40 °C - 60 °C; the temperature of the seawater in the seawater humidifier after being heated through heat exchange by the cooling water in the cooling water circulation pipeline is 35 °C - 55 °C; the temperature of the air after the air generated by the fan is mixed with the high-temperature and high-humidity air is 20 °C - 28 °C, and the humidity is 45% - 50%; at the second three-way valve, for the cooling water that obtains heat through heat exchange, the flow rate ratio of the cooling water flowing to the indoor heating to the cooling water flowing to the seawater humidifier is 1:(3 - 4). The system of the present invention can adjust the above parameters to enable the simultaneous seawater desalination, heating, and humidification of the entire system on the basis of minimizing energy loss (i.e., the chilled water in the chilled water circulation pipeline obtains the most heat in the secondary dehumidifier through heat exchange, and the compressor provides the minimum power), and makes the temperature and humidity in the building interior suitable, with sufficient seawater production for daily life, thereby improving the comfort of the building interior. By adjusting the above parameters, the heating capacity in the building interior can reach 19 kW - 22 kW, the daily fresh water production can reach 220 kg - 250 kg, and the power of the compressor is 1.3 kW - 1.7 kW.

[0029] The features and beneficial effects of the present invention are as follows:

[0030] (1) For a humidification-dehumidification type seawater desalination device, on the basis of ensuring the original fresh water supply function, the present invention ingeniously uses the high-temperature cooling water in the heat pump cycle for indoor heating, making full use of energy while reducing cost expenditure.

[0031] (2) The combination of large-scale seawater desalination and heating is mostly seen in the waste heat utilization of thermal power plants and nuclear power plants, with stable heating effect and suitable for centralized heating in coastal cities; the combination of small-scale seawater desalination and heating is mostly seen in the combination of solar energy and thermal seawater desalination. Due to the fluctuating characteristics of solar energy, its heating effect is not stable, while the heating effect of the present invention is stable.

[0032] (3) The present invention uses the humidified air for adjusting the air humidity in the indoor in winter.

[0033] (4) The present invention is equipped with an end control mechanism, and can realize the constant temperature and constant humidity function of indoor air by controlling the flow rate of chilled water for heating and the mixing ratio of humidified air and outdoor fresh air.

[0034] (5) The heat pump type humidification-dehumidification seawater desalination and indoor winter constant temperature and constant humidity system proposed by the present invention can simultaneously realize the functions of preparing fresh water and maintaining the indoor temperature and humidity in winter, and is very suitable for the buildings in the northern coastal areas and islands of our country, with remarkable innovation and application value.

[0035] (6) The present invention can perform real-time thermodynamic calculations according to user requirements and changes in the external environment, and adjust the fresh water production, heat supply and humidification amount of the system by the frequency conversion operation of the compressor and circulation pump and the opening control of the three-way valve; it can provide personalized heating services according to the physical characteristics of the building and the specific requirements of users.

[0036] (7) Each power equipment of the system can be frequency-converted adjusted, so as to control the output state of the system and adapt to the load changes on the user side. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0038] Figure 1 It is a schematic diagram of the heat pump type humidification-dehumidification seawater desalination and heating composite system provided by the present invention.

[0039] Among them, the above-mentioned drawings include the following reference numerals:

[0040] 1 - Fan; 2 - Humidifier; 3 - Primary dehumidifier; 4 - Secondary dehumidifier; 5 - Raw seawater tank; 6 - Freshwater tank; 7 - Heat pump unit; 701 - Heat pump evaporator; 702 - Compressor; 703 - Throttle valve; 704 - Heat pump condenser; 8 - Seawater heater; 9 - Seawater pump; 10 - First circulation pump; 11 - Second circulation pump; 12 - First three - way valve; 13 - Second three - way valve; A - Inlet of the primary dehumidifier; B - Inlet of the seawater heater; C - Air outlet; D - Air inlet; E - Seawater outlet. Detailed implementation manner

[0041] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, it should be understood that these embodiments are only for more detailed description and should not be construed as limiting the present invention in any form, that is, it is not intended to limit the protection scope of the present invention; relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0042] As shown in the schematic diagram of the provided heat - pump type humidification - dehumidification seawater desalination and heating combined system ( Figure 1 ), the combined system of the present invention includes a fan 1, a humidifier 2, a primary dehumidifier 3, a secondary dehumidifier 4, a raw seawater tank 5, a freshwater tank 6, a heat pump unit 7, a heat pump evaporator 701, a compressor 702, a throttle valve 703, a heat pump condenser 704, a seawater heater 8, a seawater pump 9, a first circulation pump 10, a second circulation pump 11, a first three - way valve 12, and a second three - way valve 13. Among them, the fan 1 is used to provide air in the combined system, and the humidifier 2 is used for the hot seawater to exchange heat with the air generated by the fan 1, thereby forming high - temperature and high - humidity air. Part of the high - temperature and high - humidity air is mixed with the air generated by the fan 1 to provide humidity for the indoor of the building; the other part of the high - temperature and high - humidity air is desalinated in the primary dehumidifier 3 and the secondary dehumidifier 4, and the remaining heat after seawater desalination is fully utilized for heating in the house. In the present invention, part of the generated high - temperature and high - humidity air is mixed with the air generated by the fan 1 for humidifying the indoor of the building. The mixing of the high - temperature and high - humidity air and the air generated by the fan 1 is beneficial to reducing the temperature of the humidified air, so that the moisture in the house after humidification will not evaporate quickly. Although there is a temperature difference between the formed high - temperature and high - humidity air and the temperature of the generated warm air, the humid air with a certain temperature will not cause a significant drop in the indoor temperature of the house due to water evaporation, thus providing a living environment with a certain temperature and humidity indoors. In addition, not only is the energy fully utilized, but also a comfortable living environment can be provided.

[0043] Part of the high-temperature and high-humidity air enters the first-stage dehumidifier 3. The low-temperature seawater in the original seawater tank 5 is pumped into the first-stage dehumidifier 3 by the seawater pump 9. The low-temperature seawater exchanges heat with the high-temperature and high-humidity air. At the same time, the high-temperature and high-humidity air obtains fresh water through condensation, so that the seawater desalination process of the system of the present invention is realized and collected into the fresh water tank 6. The low-temperature seawater after absorbing heat increases in temperature and flows into the seawater humidifier 8 along the pipeline. The high-temperature and high-humidity air in the first-stage dehumidifier 3 enters the second-stage dehumidifier 4. The heat pump unit 7 recovers this part of the heat through heat exchange. The heat pump unit 7 provides heat to maintain the continuous progress of seawater desalination, building indoor heating and building indoor humidification of the whole system. Among them, the heat pump unit 7 includes a heat pump evaporator 701, a heat pump condenser 704, a throttle valve 703, and a compressor 702, forming three independent circulating pipelines with the first circulating pump 10 and the second circulating pump 11 in the composite system. The second-stage dehumidifier 4, the second circulating pump 11, and the heat pump evaporator 701 are connected in sequence to form a closed-loop chilled water circulation pipeline; the heat pump evaporator 701, the compressor 702, the heat pump condenser 704, and the throttle valve 703 are connected in sequence to form a closed-loop refrigerant circulation pipeline; the heat pump condenser 704, the first circulating pump 10, and the seawater heater 8 are connected in sequence to form a closed-loop cooling water circulation pipeline. The chilled water circulation pipeline and the refrigerant circulation pipeline are respectively connected through two independent heat exchange pipelines in the heat pump evaporator 701; the refrigerant circulation pipeline and the cooling water circulation pipeline are respectively connected through two independent heat exchange pipelines in the heat pump condenser 704; the cooling water circulation pipeline and the seawater circulation pipeline are respectively connected through two independent heat exchange pipelines in the seawater humidifier 8. The high-temperature and high-humidity air exchanges heat with the chilled water in a closed-loop chilled water circulation pipeline formed by the second-stage dehumidifier 4, the second circulating pump 11, and the heat pump evaporator 701 in the second-stage dehumidifier 4, so that the chilled water obtains the remaining heat in the high-temperature and high-humidity air and condenses fresh water at the same time, which is beneficial for the system to fully obtain the remaining energy, thereby reducing energy loss. The chilled water that obtains heat transfers heat to the refrigerant in the heat pump evaporator 701 through heat exchange with the refrigerant in a closed-loop refrigerant circulation pipeline formed by connecting the heat pump evaporator 701, the compressor 702, the heat pump condenser 704, and the throttle valve 703. The refrigerant that obtains heat is further heated in the compressor 702. The compressor 702 is used to provide the heat source for the whole system, and the heat source can realize seawater desalination, house heating and house humidification at the same time. The refrigerant that is further heated transfers the heat of the refrigerant to the cooling water in a closed-loop cooling water circulation pipeline formed by connecting the heat pump condenser 704, the first circulating pump 10, and the seawater heater 8 through heat exchange in the heat pump condenser 704. After the cooling water obtains heat, it is respectively used for building indoor heating and heating the seawater in the seawater heater 8 through the first circulating pump 10. The heated seawater flows into the humidifier 2 again for heat exchange with the air generated by the blower 1.Through the heat exchange process of the heat pump unit 7, the present invention can first make full use of the heat of high-temperature and high-humidity air. Through the heat exchange method, while the heat transfer medium obtains a part of the heat, the compressor 702 is used to further heat it, thereby reducing the energy loss. And with the setting of the heat pump unit, while one end of the heat pump unit transfers the energy for seawater desalination through the heat exchange method, the other end can also provide the energy for seawater heating, the energy for building heating, and the energy for humidification. Thus, while achieving the full use of energy, the system can realize seawater desalination, building indoor heating, and indoor humidification of the building at the same time. Secondly, through the above heat exchange, the outlet water temperature of the cooling water can reach 35°C - 55°C. The cooling water within this temperature range is more conducive to the comfort of building heating. And the seawater in the seawater humidifier 8 heated at this temperature not only can obtain fresh water after heat exchange with the air generated by the fan 1, but also can provide humidified air with appropriate temperature and humidity, so that a certain humidity and temperature can be maintained inside the house, thereby improving the comfort inside the house. The heat pump unit 7 can provide the heat source of the system of the present invention, fully obtain the heat of the chilled water, and minimize the energy output of the compressor 702, which is beneficial to reducing energy waste and saving energy costs. The seawater in the seawater humidifier 8 flows back into the humidifier 2 after being heated and exchanges heat with the air generated by the fan 1 again, thereby forming continuous seawater desalination and energy output.

[0044] On this basis, we further provide an embodiment to more carefully describe the parameters and effects generated between the various configurations in the system of the present invention.

[0045] Embodiment 1:

[0046] The heat pump unit is an integrated chiller, the compressor is a scroll compressor, the refrigerant is R410A, the rated cooling capacity of the heat pump unit under standard conditions is 6.3 kW, the rated input power is 1.5 kW, the rated COP is 4.2, and the heat pump unit has inlet and return water interfaces for cooling water and chilled water left outside.

[0047] The seawater heater is made of titanium alloy to prevent seawater corrosion, and its heat exchange area is 1.5 m 2 .

[0048] The size of the humidifier is 400 mm × 400 mm × 1500 mm, the type is countercurrent, the air enters from below and flows out from above, and the high-temperature seawater enters from above and flows out from below; a rectifying grille is arranged on the lower side of the humidifier, and a nozzle is arranged on the upper side; the packing is made of polypropylene and is connected to the humidifier shell through a bracket, and the specific surface area of the packing is 350 m 2 / m 3 .

[0049] The fan is a centrifugal fan with a rated power of 0.15 kW.

[0050] The primary dehumidifier is a flat finned tube heat exchanger with titanium tubes and aluminum fins, and the total heat transfer area is 25 m 2 .

[0051] The secondary dehumidifier is a flat finned tube heat exchanger with copper tubes and aluminum fins, and the total heat transfer area is 18 m 2 .

[0052] The first circulation pump and the second circulation pump are centrifugal pumps, both with a rated power of 0.8 kW and a rated flow rate of 5 m 3 / h.

[0053] The air supply grille is made of PVC material with dimensions of 200 mm × 200 mm.

[0054] The fresh water tank is made of PVC material with dimensions of 500 mm × 500 mm × 500 mm.

[0055] The operation process of the heat pump type humidification-dehumidification seawater desalination and winter indoor constant temperature and humidity system has been described in the text and will not be elaborated here. Only the typical operating conditions of the composite system are described:

[0056] Under the conditions of outdoor air temperature of 10°C, air relative humidity of 30%, seawater temperature of 15°C, air flow rate of 250 m 3 / h, and seawater flow rate of 4 m 3 / h, 1 m 3 / h of the cooling water is used for indoor heating, 4 m 3 / h is used for the original humidification-dehumidification process. After humidification, 50 m 3 / h of the air is mixed with 100 m 3 / h of outdoor fresh air and then input into the room. The operation results of the above composite system are as follows: the fresh water production is 12 kg / h, the heating water temperature is 44°C, the air supply volume is 150 m 3 / h, and the air supply state is 24°C with a relative humidity of 50%. Estimated based on 20 hours of operation per day, the composite system can produce 240 kg of fresh water per day, which is sufficient for the daily fresh water needs of 5 people; the heating water temperature meets the recommended value range of "35°C - 45°C" for the floor radiant heating supply water temperature in the "Code for Design of Heating, Ventilation and Air Conditioning of Civil Buildings" GB50736-2012. Calculated based on a heating supply and return water temperature difference of 5°C, the heating capacity can reach 21 kW, which is sufficient to meet the conventional heating needs of a 200 m 2 house; the air supply volume and the air supply state meet the relevant regulatory requirements of the "Indoor Air Quality Standard" GB / T18883-2022.

[0057] In summary, the heat pump type humidification-dehumidification seawater desalination composite system of the present invention can provide seawater desalination while making full use of the energy in the seawater desalination process. It can not only heat the indoor environment but also provide a certain humidity indoors. On the basis of making full use of energy, it can provide a high-quality and comfortable accommodation environment.

[0058] It should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A heat pump type humidification-dehumidification seawater desalination and heating combined system, characterized in that, The composite system includes a fan (1), a humidifier (2), a heat pump unit (7), a raw seawater tank (5), a primary dehumidifier (3), a secondary dehumidifier (4), and a seawater heater (8); In the air flow direction, the fan (1), the humidifier (2), the primary dehumidifier (3), and the secondary dehumidifier (4) are connected in sequence; In the seawater flow direction, the raw seawater tank (5), the primary dehumidifier (3), the seawater heater (8), and the humidifier (2) are connected in sequence; A heat pump unit (7) is connected between the seawater heater (8) and the secondary dehumidifier (4); A branch is provided respectively before and after the humidifier (2), and the two branches are merged and connected to the building interior for humidification; One end of the heat pump unit (7) recovers the heat in the secondary dehumidifier (4) through heat exchange; the other end of the heat pump unit (7) uses heat exchange to heat the seawater in the seawater heater (8) and for heating the building interior; The composite system further includes a first three-way valve (12) and a second three-way valve (13). The first three-way valve (12) is arranged between the humidifier (2) and the primary dehumidifier (3); the second three-way valve (13) is arranged between a first circulation pump (10) and the seawater heater (8); The method for heating and humidifying the building interior by the composite system is as follows: The method for heating and humidifying the building interior can control the temperature of the high-temperature and high-humidity air flowing into the primary dehumidifier (3) to be between 33°C and 53°C, and the humidity to be not less than 95%; the temperature of the chilled water in the chilled water circulation pipeline after obtaining the heat in the secondary dehumidifier (4) through heat exchange is between 15°C and 25°C; the temperature of the cooling water in the cooling water circulation pipeline before using the heat of the cooling water to heat the seawater in the seawater heater (8) through heat exchange is between 40°C and 60°C; the temperature of the seawater heated by the cooling water in the cooling water circulation pipeline through heat exchange in the seawater heater (8) is between 35°C and 55°C; the temperature of the air mixed by the air generated by the fan (1) and the high-temperature and high-humidity air is between 20°C and 28°C, and the humidity is between 45% and 50%; at the second three-way valve (13), the flow rate ratio of the cooling water flowing to the indoor heating to the cooling water flowing to the seawater heater (8) of the cooling water obtaining heat through heat exchange is 1:(3 - 4).

2. The hybrid system for heat pump type humidification-dehumidification seawater desalination and heating according to claim 1, wherein The heat pump unit (7) includes a heat pump evaporator (701), a heat pump condenser (704), a throttle valve (703), and a compressor (702); the secondary dehumidifier (4) and the heat pump evaporator (701) are sequentially connected to form a closed-loop chilled water circulation pipeline; the heat pump evaporator (701), the compressor (702), the heat pump condenser (704), and the throttle valve (703) are sequentially connected to form a closed-loop refrigerant circulation pipeline; the heat pump condenser (704) and the seawater heater (8) are sequentially connected to form a closed-loop cooling water circulation pipeline; the chilled water circulation pipeline and the refrigerant circulation pipeline are respectively connected through two independent heat exchange pipelines in the heat pump evaporator (701); the refrigerant circulation pipeline and the cooling water circulation pipeline are respectively connected through two independent heat exchange pipelines in the heat pump condenser (704); the cooling water circulation pipeline and the seawater circulation pipeline are respectively connected through two independent heat exchange pipelines in the seawater humidifier (8).

3. A heat pump type humidification-dehumidification seawater desalination and heating composite system according to claim 1, characterized in that, The composite system further includes a first circulation pump (10) and a second circulation pump (11). In the flowing direction of the chilled water in the chilled water circulation pipeline, the second circulation pump (11) is arranged behind the secondary dehumidifier (4) and in front of the heat pump evaporator (701); in the flowing direction of the cooling water in the cooling water circulation pipeline, the first circulation pump (10) is arranged behind the heat pump condenser (704) and in front of the seawater humidifier (8).

4. A heat pump type humidification-dehumidification seawater desalination and heating combined system according to claim 1, characterized in that, The composite system further includes a seawater pump (9); the seawater pump (9) is arranged between the seawater original water tank (5) and the primary dehumidifier (3) and is used to pump the seawater in the seawater original water tank into the primary dehumidifier.

5. A heat pump type humidification-dehumidification seawater desalination and heating combined system according to claim 1, characterized in that, The composite system further includes a fresh water tank (6); the fresh water tank (6) is respectively connected to the primary dehumidifier (3) and the secondary dehumidifier (4).

6. A heat pump type humidification-dehumidification seawater desalination and heating composite system according to claim 5, characterized in that, The secondary dehumidifier (4) is further provided with an air outlet, and an air supply grille is arranged at the air outlet. The humidifier (2) is a countercurrent packing type humidifier. The material of the fresh water tank (6) is PVC material; the material of the air supply grille is PVC material.

7. A heat pump type humidification-dehumidification seawater desalination and heating combined system according to claim 1, characterized in that, The method includes that a part of the air generated by the fan (1) forms high-temperature and high-humidity air through heat exchange with the seawater in the humidifier (2), a part of the high-temperature and high-humidity air obtains fresh water through heat exchange with the low-temperature seawater from the seawater original water tank (5), and the remaining high-temperature and high-humidity air after separating the fresh water is recycled for heat by one end of the heat pump unit (7) through heat exchange. Another part of the air generated by the fan (1) is mixed with another part of the high-temperature and high-humidity air and is used for humidifying the indoor of the building. One end of the heat pump unit (7) recycles the heat of the remaining high-temperature and high-humidity air after separating the fresh water through heat exchange, and the other end of the heat pump unit (7) uses the heat for heating the seawater in the seawater humidifier (8) and for heating the indoor of the building through heat exchange. The low-temperature seawater from the seawater raw water tank (5) flows to the seawater humidifier (8) after obtaining heat through heat exchange with the high-temperature and high-humidity air, and is heated again, and then flows to the humidifier (2) to exchange heat with the air generated by the fan (1). The seawater after heat exchange finally flows out of the humidifier (2).

8. A heat pump type humidification-dehumidification seawater desalination and heating combined system according to claim 1, characterized in that, The chilled water in the chilled water circulation pipeline formed by the heat pump evaporator (701) in the heat pump unit (7) and the secondary dehumidifier (4) recovers the heat in the secondary dehumidifier (4) through heat exchange in the secondary dehumidifier (4); the refrigerant in the refrigerant circulation pipeline formed by the heat pump evaporator (701), compressor (702), heat pump condenser (704), and throttle valve (703) in the heat pump unit (7) obtains the heat of the chilled water through heat exchange with the chilled water that has obtained heat in the heat pump evaporator (701), and the refrigerant that has obtained heat is reheated in the compressor (702); the cooling water in the cooling water circulation pipeline formed by the heat pump condenser (704) in the heat pump unit (7) and the seawater humidifier (8) obtains the heat of the refrigerant through heat exchange in the heat pump condenser (704), and the cooling water after obtaining heat is respectively used for heating in the building interior and heating the seawater in the seawater humidifier (8).

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