Refrigeration equipment utilizing waste heat for refrigeration and control method thereof

Abstract

The invention discloses a refrigeration device utilizing waste heat for refrigeration and a control method thereof.The refrigeration device utilizing waste heat for refrigeration comprises a dry air generating device used for generating dry air from outside air, the dry air generating device comprises a plurality of wheel core adsorption and desorption machines, and the outside air sequentially flows through the wheel core adsorption and desorption machines and then flows through the wheel core adsorption and desorption machines; the wheel core adsorption and desorption machine comprises a wheel core adsorption area and a fresh air heat recovery area through which external air flows in sequence, the wheel core adsorption area is used for reducing the humidity of the external air, and the fresh air heat recovery area is used for reducing the temperature of the external air; and the evaporative cooling device is used for receiving the dry air and comprises an evaporative cooling mechanism, and the dry air exchanges heat with an object to be cooled through the evaporative cooling mechanism. According to the refrigeration equipment utilizing the waste heat for refrigeration and the control method of the refrigeration equipment, the low-temperature waste heat can be utilized, the continuous refrigeration requirement is met, and the situation that popularization and application of waste heat utilization are limited is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat utilization, and particularly relates to a refrigeration device using waste heat for refrigeration and its control method. Background Art

[0002] Waste heat utilization refers to the process of recovering waste heat generated in industrial production, energy conversion, or daily life through technical means and converting it into useful energy, such as refrigeration.

[0003] When the waste heat temperature is higher, the available energy in the waste heat is also more. Therefore, waste heat utilization is widely applied in industrial and high-energy-consuming fields, such as thermal power plants, steel plants, foundries, etc.

[0004] However, when the waste heat temperature is low and continuous refrigeration is required, the current devices using waste heat for refrigeration are difficult to meet the usage requirements, which limits the popularization and application of waste heat utilization. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a refrigeration device using waste heat for refrigeration, which can utilize waste heat at a lower temperature, meet the need for continuous refrigeration, and avoid the limitation of the popularization and application of waste heat utilization.

[0006] The present invention also provides a control method applied to the above-mentioned refrigeration device using waste heat for refrigeration.

[0007] A refrigeration device using waste heat for refrigeration according to an embodiment of the first aspect of the present invention includes: A dry air generating device for generating dry air from external air. The dry air generating device includes a plurality of wheel core adsorption and desorption machines. The external air flows through the plurality of wheel core adsorption and desorption machines in sequence. The wheel core adsorption and desorption machine includes a wheel core adsorption area and a fresh air heat recovery area through which the external air flows in sequence. The wheel core adsorption area is used to reduce the humidity of the external air, and the fresh air heat recovery area is used to reduce the temperature of the external air; An evaporative cooling device for receiving the dry air, including an evaporative cooling mechanism, through which the dry air exchanges heat with the object to be cooled.

[0008] A refrigeration device using waste heat for refrigeration and its control method according to an embodiment of the present invention has at least the following beneficial effects: By providing a plurality of wheel core adsorption and desorption machines, the present invention can gradually reduce the temperature and humidity of the external air, thereby obtaining the required dry air to meet the refrigeration needs.

[0009] Meanwhile, since the temperature and humidity of the external air are gradually reduced in this embodiment, the temperature difference required for the wheel core adsorption and desorption machine during adsorption and desorption is small. Therefore, waste heat at various temperatures can be utilized, the limitation on the waste heat heat source is reduced, and it is convenient for popularization and application.

[0010] By providing a wheel core adsorption area and a fresh air heat recovery area, on the one hand, the wheel core adsorption area can remove the moisture contained in the external air using heat to reduce the humidity. On the other hand, the fresh air heat recovery area can recover the heat absorbed by the external air to reduce the temperature of the external air, forming dry air with low temperature and low humidity to meet the refrigeration needs.

[0011] In this embodiment, the fresh air heat recovery area can heat the desorption air flow of the wheel core adsorption and desorption machine to increase the temperature of the desorption air flow. At the same time, by using heat recovery and waste heat heating, the efficiency of the wheel core adsorption and desorption machine is improved, the energy consumption is reduced, and further, the limitation on the waste heat heat source is reduced, enabling continuous refrigeration and avoiding the limitation of the popularization and application of waste heat utilization.

[0012] The present invention also provides a control method for refrigeration using waste heat, which has the above beneficial effects.

[0013] A refrigeration device for refrigeration using waste heat according to an embodiment of the first aspect of the present invention, the wheel core adsorption and desorption machine includes a wheel core desorption mechanism, the wheel core desorption mechanism has a desorption air flow flowing through it, the wheel core desorption mechanism includes a wheel core desorption area corresponding to the wheel core adsorption area, and a waste heat heater located on the intake side of the wheel core desorption area. The fresh air heat recovery area is located on the intake side of the waste heat heater, and both the fresh air heat recovery area and the waste heat heater heat the desorption air flow.

[0014] A refrigeration device for refrigeration using waste heat according to an embodiment of the first aspect of the present invention, the wheel core desorption mechanism further includes a heat rejection recovery area located on the outlet side of the wheel core desorption area, and the heat rejection recovery area is located on the intake side of the wheel core desorption area of another wheel core adsorption and desorption machine, so that the desorption air flow that has completed the desorption function on one wheel core adsorption and desorption machine heats the desorption air flow that is to perform the desorption function on another wheel core adsorption and desorption machine.

[0015] A refrigeration device for refrigeration using waste heat according to an embodiment of the first aspect of the present invention, a plurality of the wheel core adsorption and desorption machines include an N - th stage wheel core adsorption and desorption machine and an (N + 1)-th stage wheel core adsorption and desorption machine. The external air first flows through the N - th stage wheel core adsorption and desorption machine, and then the external air flows through the (N + 1)-th stage wheel core adsorption and desorption machine; The desorption air flow that has completed the desorption function on one of the wheel core adsorption / desorption machines heats the desorption air flow that is to perform the desorption function on another wheel core adsorption / desorption machine, including: the desorption air flow that has completed the desorption function on the (N + 1)-th stage wheel core adsorption / desorption machine heats the desorption air flow that is to perform the desorption function on the N-th stage wheel core adsorption / desorption machine.

[0016] A refrigeration device using waste heat for refrigeration according to an embodiment of the first aspect of the present invention, wherein a plurality of the wheel core adsorption / desorption machines include (N + 1)-th stage wheel core adsorption / desorption machines; The desorption air flow that has completed the desorption function on one of the wheel core adsorption / desorption machines heats the desorption air flow that is to perform the desorption function on another wheel core adsorption / desorption machine, including: the desorption air flow that has completed the desorption function on the first stage wheel core adsorption / desorption machine heats the desorption air flow that is to perform the desorption function on the (N + 1)-th stage wheel core adsorption / desorption machine.

[0017] A refrigeration device using waste heat for refrigeration according to an embodiment of the first aspect of the present invention, the heat rejection recovery area is located between the waste heat heater and the fresh air heat recovery area of another wheel core adsorption / desorption machine, and the heat rejection recovery area is used to heat the desorption air flow that has been heated by the fresh air heat recovery area and has not been heated by the waste heat heater on another wheel core adsorption / desorption machine.

[0018] A refrigeration device using waste heat for refrigeration according to an embodiment of the first aspect of the present invention, the wheel core desorption mechanism includes a desorption air inlet end and a desorption air outlet end, a desorption air inlet filter is provided at the desorption air inlet end, and a desorption fan is provided at the desorption air outlet end; And / or, the dry air generating device includes a fresh air inlet filter, and the external air flows through the fresh air inlet filter and then enters the wheel core adsorption / desorption machine.

[0019] A control method for refrigeration using waste heat according to an embodiment of the second aspect of the present invention is applied to a refrigeration device using waste heat as described in any one of the above. The control method includes: A dry air generation step, the dry air generating device introduces external air, and the external air sequentially flows through a plurality of the wheel core adsorption / desorption machines to produce dry air. In the wheel core adsorption / desorption machine, the external air first flows through the wheel core adsorption area to increase the temperature and reduce the humidity, and then the external air flows through the fresh air heat recovery area to cool down; An evaporative cooling step, the dry air flows through the evaporative cooling mechanism, and the dry air exchanges heat with the object to be cooled through the evaporative cooling mechanism to cool the object to be cooled.

[0020] A control method for waste heat utilization refrigeration according to an embodiment of the second aspect of the present invention. The wheel core adsorption and desorption machine includes a wheel core desorption mechanism through which a desorption air flow circulates. The wheel core desorption mechanism includes a wheel core desorption area corresponding to the wheel core adsorption area and a waste heat heater located on the intake side of the wheel core desorption area. The fresh air heat recovery area is located on the intake side of the waste heat heater, and both the fresh air heat recovery area and the waste heat heater heat the desorption air flow; The wheel core desorption mechanism further includes a heat recovery area located on the outlet side of the wheel core desorption area, and the heat recovery area is located on the intake side of the wheel core desorption area of another wheel core adsorption and desorption machine, so that the desorption air flow that has completed the desorption function on one wheel core adsorption and desorption machine heats the desorption air flow that is to perform the desorption function on another wheel core adsorption and desorption machine; The control method includes: A wheel core desorption step, in which the desorption air flow sequentially passes through the fresh air heat recovery area, the waste heat heater, and the wheel core desorption area of the same level, so as to regenerate the wheel core by desorption.

[0021] A control method for waste heat utilization refrigeration according to an embodiment of the second aspect of the present invention. The wheel core desorption mechanism further includes a heat recovery area located on the outlet side of the wheel core desorption area, and the heat recovery area is located on the intake side of the wheel core desorption area of another wheel core adsorption and desorption machine, so that the desorption air flow that has completed the desorption function on one wheel core adsorption and desorption machine heats the desorption air flow that is to perform the desorption function on another wheel core adsorption and desorption machine; In the wheel core desorption step, after passing through the fresh air heat recovery area and before passing through the waste heat heater, the desorption air flow passes through the heat recovery area of another wheel core desorption machine.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of a dry air generating device of a refrigeration device for waste heat utilization refrigeration according to an embodiment of the present invention; Figure 2 It is a schematic structural diagram of an evaporative cooling device of a refrigeration device for waste heat utilization refrigeration according to an embodiment of the present invention; Figure 3 is Figure 1 a state parameter diagram of a part of a refrigeration device that uses waste heat for refrigeration; Figure 4 is Figure 1 a state parameter diagram of another part of a refrigeration device that uses waste heat for refrigeration; Figure 5 is Figure 1 a state parameter diagram of yet another part of a refrigeration device that uses waste heat for refrigeration; Figure 6 is applied to Figure 1 a working flow chart of a control method for a refrigeration device that uses waste heat for refrigeration.

[0025] Reference numerals: 1 fresh air inlet; 2 fresh air filter; 3 processing side fan; 4 inlet air state of the first-stage wheel core; 5 adsorption area of the first-stage wheel core; 6 outlet air state of the first-stage wheel core; 7 first-stage waste heat heater; 8 first-stage fresh air heat recovery area; 9 inlet air state of the second-stage wheel core; 10 adsorption area of the second-stage wheel core; 11 outlet air state of the second-stage wheel core; 12 second-stage waste heat heater; 13 second-stage fresh air heat recovery area; 14 inlet air state of the third-stage wheel core; 15 adsorption area of the third-stage wheel core; 16 outlet air state of the third-stage wheel core; 17 third-stage waste heat heater; 18 third-stage fresh air heat recovery area; 19 inlet air state of the fourth-stage wheel core; 20 adsorption area of the fourth-stage wheel core; 21 outlet air state of the fourth-stage wheel core; 22 fourth-stage waste heat heater; 23 fourth-stage fresh air heat recovery area; 24 low-humidity and low-enthalpy air inlet; 25 evaporative cooling device; 26 high-temperature water inlet channel; 27 medium-temperature water outlet channel; 30 heat dissipation fan; 31 high-humidity exhaust; 32 inlet air state of the fourth-stage desorption; 33 fourth-stage desorption inlet air filter; 34 fourth-stage exhaust heat recovery; 35 outlet air state of the fourth-stage desorption; 36 fourth-stage desorption fan; 37 inlet air condition of the fourth-stage regeneration; 38 fourth-stage wheel core desorption area; 39 outlet air condition of the fourth-stage regeneration; 40 inlet air state of the third-stage desorption; 41 third-stage desorption inlet air filter; 42 third-stage exhaust heat recovery; 43 outlet air state of the third-stage desorption; 44 third-stage desorption fan; 45 inlet air condition of the third-stage regeneration; 46 third-stage wheel core desorption area; 47 outlet air condition of the third-stage regeneration; 48 inlet air state of the second-stage desorption; 49 second-stage desorption inlet air filter; 50 second-stage exhaust heat recovery; 51 outlet air state of the second-stage desorption; 52 second-stage desorption fan; 53 inlet air condition of the second-stage regeneration; 54 second-stage wheel core desorption area; 55 outlet air condition of the second-stage regeneration; 56 inlet air state of the first-stage desorption; 57 first-stage desorption inlet air filter; 58 first-stage exhaust heat recovery; 59 outlet air state of the first-stage desorption; 60 first-stage desorption fan; 61 inlet air condition of the first-stage regeneration; 62 first-stage wheel core desorption area; 63 outlet air condition of the first-stage regeneration. Detailed Implementation Modes

[0026] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention.

[0027] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood not to include the original number, and above, below, within, etc. are understood to include the original number. If there is a description of first and second, this is only used to distinguish technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation, connection and connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] The following describes a refrigeration device using waste heat for refrigeration and its control method according to an embodiment of the present invention with reference to the accompanying drawings.

[0031] Refer to Figure 1 and Figure 2 The present invention aims to provide an embodiment of a refrigeration device using waste heat for refrigeration.

[0032] In this embodiment, the refrigeration device mainly includes a dry air generation device and an evaporative cooling device.

[0033] Among them, the dry air generation device includes a fresh air passage and a desorption passage.

[0034] Among them, the fresh air passage has a fresh air inlet 1, a fresh air filter 2, a processing side fan 3, a first-stage wheel core adsorption area 5, a first-stage fresh air heat recovery area 8, a second-stage wheel core adsorption area 10, a second-stage fresh air heat recovery area 13, a third-stage wheel core adsorption area 15, a third-stage fresh air heat recovery area 18, a fourth-stage wheel core adsorption area 20, and a fourth-stage fresh air heat recovery area 23.

[0035] External air enters the fresh air passage from the fresh air inlet 1, and then successively flows through the fresh air filter 2, the processing side fan 3, the first-stage wheel core adsorption area 5, the first-stage fresh air heat recovery area 8, the second-stage wheel core adsorption area 10, the second-stage fresh air heat recovery area 13, the third-stage wheel core adsorption area 15, the third-stage fresh air heat recovery area 18, the fourth-stage wheel core adsorption area 20, and the fourth-stage fresh air heat recovery area 23. Finally, dry air is generated, and the dry air enters the evaporative cooling device to complete refrigeration.

[0036] When external air successively flows through the above areas, dehumidification and cooling can be achieved. Specifically, the external air undergoes various state changes, and the states of the external air include the first-stage wheel core inlet state 4, the first-stage wheel core outlet state 6, the second-stage wheel core inlet state 9, the second-stage wheel core outlet state 11, the third-stage wheel core inlet state 14, the third-stage wheel core outlet state 16, the fourth-stage wheel core inlet state 19, the fourth-stage wheel core outlet state 21, and the fresh air passage outlet state.

[0037] For the specific values of the first-stage wheel core inlet state 4, the first-stage wheel core outlet state 6, the second-stage wheel core inlet state 9, the second-stage wheel core outlet state 11, the third-stage wheel core inlet state 14, the third-stage wheel core outlet state 16, the fourth-stage wheel core inlet state 19, the fourth-stage wheel core outlet state 21, and the fresh air passage outlet state, reference can be made to Figures 3 to 5 the values in.

[0038] At the same time, it can be understood that for the state of the external air before and after flowing through the first-stage fresh air heat recovery area 8, it can be determined by the first-stage wheel core outlet state 6 and the second-stage wheel core inlet state 9.

[0039] At the same time, it can be understood that for the state of the external air before and after flowing through the second-stage fresh air heat recovery area 13, it can be determined by the second-stage wheel core outlet state 11 and the third-stage wheel core inlet state 14.

[0040] At the same time, it can be understood that for the state of the external air before and after flowing through the third-stage fresh air heat recovery area 18, it can be determined by the third-stage wheel core outlet state 16 and the fourth-stage wheel core inlet state 19.

[0041] At the same time, it can be understood that for the state of the external air before and after flowing through the fourth-stage fresh air heat recovery area 23, it can be determined by the fourth-stage wheel core outlet state 21 and the fresh air passage outlet state.

[0042] Structurally, the dry air generating device of this embodiment includes a first-stage wheel core adsorption / desorption machine, a second-stage wheel core adsorption / desorption machine, a third-stage wheel core adsorption / desorption machine, and a fourth-stage wheel core adsorption / desorption machine.

[0043] Among them, the first-stage wheel core adsorption / desorption machine includes a first-stage wheel core adsorption area 5 and a first-stage fresh air heat recovery area 8.

[0044] The second-stage wheel core adsorption / desorption machine includes a second-stage wheel core adsorption area 10 and a second-stage fresh air heat recovery area 13.

[0045] The third-stage wheel core adsorption / desorption machine includes a third-stage wheel core adsorption area 15 and a third-stage fresh air heat recovery area 18.

[0046] The fourth-stage wheel core adsorption / desorption machine includes a fourth-stage wheel core adsorption area 20 and a fourth-stage fresh air heat recovery area 23.

[0047] For the desorption air path, the desorption passage has a fourth-stage desorption inlet air filter 33, a fourth-stage exhaust air heat recovery area 34, a fourth-stage desorption fan 36, a fourth-stage wheel core desorption area 38, a third-stage desorption inlet air filter 41, a third-stage exhaust air heat recovery area 42, a third-stage desorption fan 44, a third-stage wheel core desorption area 46, a second-stage desorption inlet air filter 49, a second-stage exhaust air heat recovery area 50, a second-stage desorption fan 52, a second-stage wheel core desorption area 54, a first-stage desorption inlet air filter 57, a first-stage exhaust air heat recovery area 58, a first-stage desorption fan 60, and a first-stage wheel core desorption area 62.

[0048] Structurally, the fourth-stage wheel core adsorption / desorption machine includes a fourth-stage desorption inlet air filter 33, a fourth-stage exhaust air heat recovery area 34, a fourth-stage waste heat heater 22, a fourth-stage desorption fan 36, and a fourth-stage wheel core desorption area 38.

[0049] The third-stage wheel core adsorption / desorption machine includes a third-stage desorption inlet air filter 41, a third-stage exhaust air heat recovery area 42, a third-stage waste heat heater 17, a third-stage desorption fan 44, and a third-stage wheel core desorption area 46.

[0050] The second-stage wheel core adsorption / desorption machine includes a second-stage desorption inlet air filter 49, a second-stage exhaust air heat recovery area 50, a second-stage waste heat heater 12, a second-stage desorption fan 52, and a second-stage wheel core desorption area 54.

[0051] The first-stage wheel core adsorption / desorption machine includes a first-stage desorption inlet air filter 57, a first-stage exhaust air heat recovery area 58, a first-stage waste heat heater 7, a first-stage desorption fan 60, and a first-stage wheel core desorption area 62.

[0052] Regarding the state changes of the desorption airflows of the wheel cores of all levels, specifically, the state changes of the desorption airflow of the 4th-level wheel core adsorption and desorption machine can be determined according to the 4th-level desorption inlet air state 32, the 4th-level desorption outlet air state 35, the 4th-level regeneration inlet air condition 37, and the 4th-level regeneration outlet air condition 39.

[0053] The state changes of the desorption airflow of the 3rd-level wheel core adsorption and desorption machine can be determined according to the 3rd-level desorption inlet air state 40, the 3rd-level desorption outlet air state 43, the 3rd-level regeneration inlet air condition 45, and the 3rd-level regeneration outlet air condition 47.

[0054] The state changes of the desorption airflow of the 2nd-level wheel core adsorption and desorption machine can be determined according to the 2nd-level desorption inlet air state 48, the 2nd-level desorption outlet air state 51, the 2nd-level regeneration inlet air condition 53, and the 2nd-level regeneration outlet air condition 55.

[0055] The state changes of the desorption airflow of the 1st-level wheel core adsorption and desorption machine can be determined according to the 1st-level desorption inlet air state 56, the 1st-level desorption outlet air state 59, the 1st-level regeneration inlet air condition 61, and the 1st-level regeneration outlet air condition 63.

[0056] Regarding the specific values of the 4th-level desorption inlet air state 32, the 4th-level desorption outlet air state 35, the 4th-level regeneration inlet air condition 37, the 4th-level regeneration outlet air condition 39, the 3rd-level desorption inlet air state 40, the 3rd-level desorption outlet air state 43, the 3rd-level regeneration inlet air condition 45, the 3rd-level regeneration outlet air condition 47, the 2nd-level desorption inlet air state 48, the 2nd-level desorption outlet air state 51, the 2nd-level regeneration inlet air condition 53, the 2nd-level regeneration outlet air condition 55, the 1st-level desorption inlet air state 56, the 1st-level desorption outlet air state 59, the 1st-level regeneration inlet air condition 61, and the 1st-level regeneration outlet air condition 63, they can be obtained with reference to Figures 3 to 5 the values in.

[0057] Regarding the evaporative cooling device 25, the evaporative cooling device 25 includes a low-humidity and low-enthalpy air inlet 24 and an evaporative cooling mechanism.

[0058] In some specific embodiments of the present invention, the low-humidity and low-enthalpy air inlet 24 can be classified into the dry air generation device without affecting the actual effect.

[0059] The evaporative cooling mechanism includes a high-temperature water inlet channel 26 and a medium-temperature water outlet channel 27, which turn the high-temperature water entering the evaporative cooling mechanism into medium-temperature water and raise the dry air by 1 to 3 degrees Celsius.

[0060] The evaporative cooling mechanism further includes a heat dissipation fan 30, and the heat dissipation fan 30 promotes the discharge of the dry air to form a high-humidity exhaust gas 31.

[0061] The dry air generating device contains a wheel core adsorption and desorption machine with one or more stages, so as to remove the water content in the air in one or more stages and gradually increase the dry air energy of the air.

[0062] Taking the first stage as an example, its operating principle is described. The operating principles of the remaining stages are similar. The difference is that the water content of the air in the later stages is lower and the dry air energy is greater.

[0063] External air, that is, the fresh air for environmental treatment, enters the dry air generating device from the fresh air inlet 1, and most of the dust and particles in the air are removed by the fresh air filter 2. Then, the processing side fan 3 provides the power for air flow. After the processing side fan 3 pressurizes the air, the air passes through the first-stage wheel core adsorption area 5 step by step, and its state changes from the first-stage wheel core inlet air state 4 to the first-stage wheel core outlet air state 6. The transformation process follows the heat and mass exchange of approximate isenthalpic heat transfer and mass transfer.

[0064] During the process from the first-stage wheel core inlet air state 4 to the first-stage wheel core outlet air state 6, the dry bulb temperature rises and the water content decreases, achieving the effect of reducing the wet bulb temperature.

[0065] The process of external air changing from the first-stage wheel core inlet air state 4 to the first-stage wheel core outlet air state 6 and the process of the desorption air flow changing from the first-stage regeneration inlet air condition 61 to the first-stage regeneration exhaust air condition 63 are both isenthalpic heat and mass exchanges.

[0066] The air after the first-stage wheel core outlet air state 6 then enters the first-stage fresh air heat recovery area 8. Utilizing the fact that the dry bulb temperature of the first-stage wheel core outlet air state 6 is higher than the first-stage desorption inlet air state 56 of the outdoor air, sensible heat exchange is carried out in the first-stage fresh air heat recovery area 8, so that the temperature of the processed air decreases and then enters the second-stage wheel core adsorption and desorption device.

[0067] The desorption air flow in the first-stage desorption inlet air state 56 will be heated and raised in temperature through the first-stage fresh air heat recovery area 8 to form desorption fresh air.

[0068] Then, the desorption fresh air enters the first-stage exhaust heat recovery area 58, and the desorption fresh air exchanges sensible heat with the desorption exhaust air of the second stage, recovering the sensible heat of the second-stage regeneration exhaust air condition 55 to achieve secondary heating of the desorption fresh air.

[0069] Then, the desorption fresh air is heated to the designed state dry bulb temperature by the first-stage waste heat heater 7, and the water molecules are heated and desorbed in the first-stage wheel core desorption area 62. Finally, the desorption fresh air is discharged outdoors through the fourth-stage desorption fan 36. Ultimately, the use of waste heat to regenerate the adsorption area is realized, the independent control of the air temperature and humidity in the adsorption area is achieved, the wet bulb temperature is continuously reduced, and the dry air energy is increased.

[0070] The low-humidity air processed by the dry air generation device, that is, the dry air, enters the 24 evaporation cooling device 25 from the low-humidity and low-enthalpy air inlet. The dry air forms high-humidity air after evaporative cooling heat and moisture exchange in the evaporation cooling device 25, and the high-humidity air is discharged through the heat dissipation fan 30 to form high-humidity exhaust gas 31.

[0071] Correspondingly, the evaporation cooling device 25 evaporatively cools and refrigerates the high-temperature water in the high-temperature water inlet channel 26 to the medium-temperature water in the medium-temperature water outlet channel 27.

[0072] Taking the dryness, humidity and temperature of the incoming air state as 34.4 °C / 19.2 °C as an example in this embodiment, the state parameters of each part of the refrigeration equipment are shown in Figure 3 .

[0073] In summary, by setting a number of wheel core adsorption and desorption machines, the present invention can gradually reduce the temperature and humidity of the external air, thereby obtaining the required dry air to meet the refrigeration needs.

[0074] At the same time, since the temperature and humidity of the external air are gradually reduced in this embodiment, the temperature difference required for the wheel core adsorption and desorption machine to perform adsorption and desorption is small, and the waste heat of various temperatures can be utilized, reducing the limitation on the waste heat heat source and facilitating popularization and application.

[0075] By setting a wheel core adsorption area and a fresh air heat recovery area, on the one hand, the wheel core adsorption area can use heat to remove the moisture contained in the external air and reduce the humidity. On the other hand, the fresh air heat recovery area can recover the heat absorbed by the external air, reduce the temperature of the external air, and form dry air with low temperature and low humidity to meet the refrigeration needs.

[0076] In this embodiment, the fresh air heat recovery area can heat the desorption air flow of the wheel core adsorption and desorption machine to increase the temperature of the desorption air flow. At the same time, by using heat recovery and waste heat heating, the efficiency of the wheel core adsorption and desorption machine is improved, the energy consumption is reduced, and further, the limitation on the waste heat heat source is reduced, enabling continuous refrigeration and avoiding the limitation of the popularization and application of waste heat utilization.

[0077] In some specific embodiments of the present invention, the wheel core adsorption and desorption machine can include a wheel core desorption mechanism. The wheel core desorption mechanism has a desorption air flow flowing through it. The wheel core desorption mechanism includes a wheel core desorption area corresponding to the wheel core adsorption area and a waste heat heater located on the intake side of the wheel core desorption area. The fresh air heat recovery area is located on the intake side of the waste heat heater. Both the fresh air heat recovery area and the waste heat heater heat the desorption air flow. Refer to the first-stage wheel core adsorption and desorption machine, the second-stage wheel core adsorption and desorption machine, the third-stage wheel core adsorption and desorption machine, and the fourth-stage wheel core adsorption and desorption machine.

[0078] It is easy to understand that in this embodiment, by heating the desorption air flow by the external air in the fresh air heat recovery area, the thermal energy can be recycled and recovered, the efficiency can be improved, and the maximization of energy saving and cost reduction can be achieved.

[0079] In some specific embodiments of the present invention, the wheel core desorption mechanism may further include a heat recovery area located on the air outlet side of the wheel core desorption area. The heat recovery area is located on the air inlet side of the wheel core desorption area of another wheel core adsorption / desorption machine, so that the desorption air flow that has completed the desorption function on one wheel core adsorption / desorption machine heats the desorption air flow to be desorbed on another wheel core adsorption / desorption machine. Refer to the first-stage wheel core adsorption / desorption machine, the second-stage wheel core adsorption / desorption machine, the third-stage wheel core adsorption / desorption machine, and the fourth-stage wheel core adsorption / desorption machine.

[0080] For example, after the desorption air flow of the second-stage wheel core adsorption / desorption machine passes through the second-stage wheel core desorption area 54, it will enter the first-stage exhaust heat recovery area 58 to reheat the desorption air flow of the first-stage wheel core adsorption / desorption machine, so that the desorption air flow of the first-stage wheel core adsorption / desorption machine will pass through the first-stage fresh air heat recovery area 8, the first-stage exhaust heat recovery area 58, and the first-stage waste heat heater 7 to achieve three times of heating, improve the desorption capacity of the first-stage wheel core desorption area 62, facilitate the regeneration of the first-stage wheel core adsorption area 5, and enable the refrigeration equipment of this embodiment to continuously and stably produce a refrigeration effect.

[0081] In other words, assume that the second-stage wheel core adsorption / desorption machine is the (N + 1)-th stage wheel core adsorption / desorption machine, and the first-stage wheel core adsorption / desorption machine is the N-th stage wheel core adsorption / desorption machine. Therefore, the desorption air flow that has completed the desorption function on the (N + 1)-th stage wheel core adsorption / desorption machine can heat the desorption air flow to be desorbed on the N-th stage wheel core adsorption / desorption machine.

[0082] In some specific embodiments of the present invention, the desorption air flow that has completed the desorption function on one wheel core adsorption / desorption machine can heat the desorption air flow to be desorbed on another wheel core adsorption / desorption machine. According to the actual layout, there is no need to emphasize the order of the (N + 1)-th stage wheel core adsorption / desorption machine and the N-th stage wheel core adsorption / desorption machine.

[0083] In some specific embodiments of the present invention, several wheel core adsorption / desorption machines may include an N-th stage wheel core adsorption / desorption machine and an (N + 1)-th stage wheel core adsorption / desorption machine. The external air first flows through the N-th stage wheel core adsorption / desorption machine, and then the external air flows through the (N + 1)-th stage wheel core adsorption / desorption machine.

[0084] It is easy to understand that the dry air generating device is composed of one or more stages of adsorption wheel cores connected in series. The wheel core adopts low-temperature regeneration technology and can be desorbed and regenerated when the temperature difference from the environment is more than 15°C. The moisture content in the outside air is gradually removed to reduce the wet bulb temperature. The power energy for removing the moisture content in the air comes from waste heat. In each stage, the moisture in the air is absorbed in the adsorption area. When the wheel core rotates to the desorption area, high-temperature air desorbs it to transfer and discharge the moisture content in the air, continuously realizing the transfer of the moisture content in the air and continuously realizing the independent treatment of the dry and wet bulb temperatures in the air.

[0085] Meanwhile, when using waste heat for desorption zone heating, fresh air heat recovery and exhaust air heat recovery are simultaneously utilized to heat the desorption fresh air in two stages for free, maximizing energy conservation and cost savings.

[0086] In some specific embodiments of the present invention, several wheel core adsorption-desorption machines may include an N+1-stage wheel core adsorption-desorption machine. Among them, the desorption air flow that has completed the desorption function on one wheel core adsorption-desorption machine heats the desorption air flow to be desorbed on another wheel core adsorption-desorption machine, including: the desorption air flow that has completed the desorption function on the first-stage wheel core adsorption-desorption machine heats the desorption air flow to be desorbed on the N+1-stage wheel core adsorption-desorption machine. Reference can be made to Figure 1 the connection relationship between the first-stage wheel core adsorption-desorption machine and the fourth-stage wheel core adsorption-desorption machine in

[0087] In this embodiment, a multi-stage adsorption wheel core series connection technology is combined with an evaporative cooling technology. It consists of a dry air generation device and an evaporative cooling device. The dry air generation device gradually reduces the water content in the air and the wet bulb temperature, improving the dry air energy of the air.

[0088] Then, the dry air with a low wet bulb temperature is used to be sent into the evaporative cooling device, where the high-temperature inlet water is cooled to medium-temperature water that is 1 - 3°C higher than the wet bulb temperature of the dry air. The system efficiency can reach over 10.

[0089] In this embodiment, after the dry air generation device produces dry air with a normal temperature dry bulb temperature and a low wet bulb temperature (WBT = 15°C), the energy of the dry air is improved. The dry air is sent to the air inlets on both sides of the evaporative cooling device to perform evaporative cooling heat exchange on the circulating spray water to cool it down, realizing the preparation of medium-temperature cold water. Among them, the inlet water temperature is 21°C, and the outlet water temperature is 16°C.

[0090] In addition, this embodiment does not require the use of a compressor. This embodiment can achieve the supply of medium-temperature cold water continuously throughout the year. This embodiment is not restricted by regions and climates, and has a high system efficiency throughout the year. As long as there is waste heat, refrigeration can be achieved, and it is particularly suitable for scenarios with a large amount of waste heat emissions such as mines, data centers, and industrial factories.

[0091] It is easy to understand that the present invention uses adsorption dehumidification combined with evaporative cooling to achieve large-scale continuous and efficient refrigeration. The present invention first separates temperature and humidity through the method of dehumidification, and then, improves the dry air energy of the air, or generates dry air. Then, the high-grade dry air is used for evaporative cooling to achieve refrigeration coupling.

[0092] Among them, the dry air generation device is controlled by the set value of the outlet water temperature, and the dry air provided by the dry air generation device at the low-humidity and low-enthalpy air inlet 24 is less than the set value of the medium-temperature water in the medium-temperature water outlet channel 27 by 1-3 °C.

[0093] The air volume required by the evaporative cooling device is determined by the required cooling capacity, and is frequency-controlled according to the cooling capacity requirement to control the processing-side fan 3 to determine and reach the air volume of the fresh air inlet 1.

[0094] For the dry air production device, whether to use a single stage or multiple stages is determined by the humidity temperature / water content of the dry air required by the evaporative cooling device at the low-humidity and low-enthalpy air inlet 24.

[0095] When the required outlet water temperature is lower, the lower the humidity temperature / water content of the dry air required at the low-humidity and low-enthalpy air inlet 24, and more stages of wheel cores must be connected in series.

[0096] For the heating temperatures of the first-stage waste heat heater 7, the second-stage waste heat heater 12, the third-stage waste heat heater 17, and the fourth-stage waste heat heater 22, they are also controlled according to the value of the humidity temperature / water content of the dry air at the low-humidity and low-enthalpy air inlet 24.

[0097] For the fourth-stage desorption fan 36, the third-stage desorption fan 44, the second-stage desorption fan 52, and the first-stage desorption fan 60, they can operate at a constant air volume or a variable air volume.

[0098] When operating at a variable air volume, the air volume frequency converter performs PID adjustment control according to the set target value of the humidity temperature / water content of the dry air at the low-humidity and low-enthalpy air inlet 24.

[0099] In some specific embodiments of the present invention, the structural forms of the fresh air heat recovery area and the exhaust air heat recovery area can be plate type, wheel core type, heat pipe type, etc., and the corresponding materials can be PVC, aluminum, copper, etc.

[0100] In some specific embodiments of the present invention, the structural form of the waste heat heater can be finned tube type, plate fin type, etc., and the heat source of the waste heat heater can be water, steam, air, etc.

[0101] In some specific embodiments of the present invention, the wheel core of the wheel core adsorption / desorption machine can be made of materials such as silica gel, molecular sieve, MOF, or a mixture of related materials. The wheel core has an adsorption / desorption function at 30-80 °C to achieve low-temperature regeneration and temperature and humidity separation control for dehumidification.

[0102] In some specific embodiments of the present invention, the processing fan or regeneration fan of the device can be an AC fan or an EC fan.

[0103] Refer to Figure 4, the present invention also aims to provide a control method for waste heat refrigeration, which is applied to a refrigeration device using waste heat according to any one of the above.

[0104] Specifically, the control method includes a dry air generation step S1 and an evaporative cooling step S2.

[0105] Among them, in the dry air generation step S1, the dry air generation device introduces external air, and the external air flows through a number of rotary core adsorption / desorption machines in sequence to produce dry air. In the rotary core adsorption / desorption machine, the external air first flows through the rotary core adsorption area to increase the temperature and reduce the humidity, and then the external air flows through the fresh air heat recovery area to cool down. Among them, in the evaporative cooling step S2, the dry air flows through the evaporative cooling mechanism, and the dry air exchanges heat with the object to be cooled through the evaporative cooling mechanism to cool the object to be cooled.

[0106] In this embodiment, the object to be cooled is high-temperature water. After cooling, medium-temperature water is formed and the temperature is reduced.

[0107] In some specific embodiments of the present invention, the evaporative cooling mechanism can include heat convection, heat radiation, spraying, etc.

[0108] In some specific embodiments of the present invention, the rotary core adsorption / desorption machine includes a rotary core desorption mechanism. The rotary core desorption mechanism has a desorption air flow flowing through it. The rotary core desorption mechanism includes a rotary core desorption area corresponding to the rotary core adsorption area, a waste heat heater located on the intake side of the rotary core desorption area, and the fresh air heat recovery area is located on the intake side of the waste heat heater. Both the fresh air heat recovery area and the waste heat heater heat the desorption air flow.

[0109] At the same time, the rotary core desorption mechanism further includes a heat recovery area located on the outlet side of the rotary core desorption area. The heat recovery area is located on the intake side of the rotary core desorption area of another rotary core adsorption / desorption machine, so that the desorption air flow that has completed the desorption function on one rotary core adsorption / desorption machine heats the desorption air flow that is to perform the desorption function on another rotary core adsorption / desorption machine.

[0110] Therefore, the control method further includes a rotary core desorption step S3, and the desorption air flow flows through the fresh air heat recovery area, the waste heat heater, and the rotary core desorption area of the same level in sequence to regenerate the rotary core desorption.

[0111] In some specific embodiments of the present invention, the rotary core desorption mechanism can further include a heat recovery area located on the outlet side of the rotary core desorption area. The heat recovery area is located on the intake side of the rotary core desorption area of another rotary core adsorption / desorption machine, so that the desorption air flow that has completed the desorption function on one rotary core adsorption / desorption machine heats the desorption air flow that is to perform the desorption function on another rotary core adsorption / desorption machine.

[0112] In the wheel core desorption step S3, after flowing through the fresh air heat recovery area and before flowing through the waste heat heater, the desorption air flow flows through the heat recovery area of another wheel core desorber.

[0113] In the description of this specification, the description with reference to terms such as "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0114] In the specification and claims of this application and the above drawings, terms such as "first, second, third, fourth" etc. (if any) are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than that shown or described here.

[0115] It should also be noted that in the description of this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0116] In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may also include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0117] Moreover, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements not only includes those elements, but also includes other elements not clearly listed, or also includes elements inherent to this process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device that includes the said element.

[0118] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art to which the present invention pertains.

Claims

1. A refrigeration device using waste heat for refrigeration, characterized in that, Comprising: A dry air generating device for generating dry air from external air. The dry air generating device includes a plurality of wheel core adsorption and desorption machines. The external air flows through the plurality of wheel core adsorption and desorption machines in sequence. The wheel core adsorption and desorption machine includes a wheel core adsorption area and a fresh air heat recovery area through which the external air flows in sequence. The wheel core adsorption area is used to reduce the humidity of the external air, and the fresh air heat recovery area is used to reduce the temperature of the external air; An evaporative cooling device for receiving the dry air, including an evaporative cooling mechanism. The dry air exchanges heat with the object to be cooled through the evaporative cooling mechanism.

2. The refrigeration equipment using waste heat for refrigeration according to claim 1, characterized in that: The wheel core adsorption and desorption machine includes a wheel core desorption mechanism through which a desorption air flow circulates. The wheel core desorption mechanism includes a wheel core desorption area corresponding to the wheel core adsorption area and a waste heat heater located on the intake side of the wheel core desorption area. The fresh air heat recovery area is located on the intake side of the waste heat heater. Both the fresh air heat recovery area and the waste heat heater heat the desorption air flow.

3. The refrigeration equipment using waste heat for refrigeration according to claim 2, characterized in that: The wheel core desorption mechanism further includes a heat rejection recovery area located on the outlet side of the wheel core desorption area. The heat rejection recovery area is located on the intake side of the wheel core desorption area of another wheel core adsorption and desorption machine, so that the desorption air flow that has completed the desorption function on one wheel core adsorption and desorption machine heats the desorption air flow that is to perform the desorption function on another wheel core adsorption and desorption machine.

4. The refrigeration equipment using waste heat for refrigeration according to claim 3, characterized in that, The plurality of wheel core adsorption and desorption machines include an Nth-stage wheel core adsorption and desorption machine and an (N + 1)th-stage wheel core adsorption and desorption machine. The external air first flows through the Nth-stage wheel core adsorption and desorption machine, and then the external air flows through the (N + 1)th-stage wheel core adsorption and desorption machine; The desorption air flow that has completed the desorption function on one wheel core adsorption and desorption machine heats the desorption air flow that is to perform the desorption function on another wheel core adsorption and desorption machine, including: the desorption air flow that has completed the desorption function on the (N + 1)th-stage wheel core adsorption and desorption machine heats the desorption air flow that is to perform the desorption function on the Nth-stage wheel core adsorption and desorption machine.

5. The refrigeration equipment using waste heat for refrigeration according to claim 4, characterized in that: The plurality of wheel core adsorption and desorption machines include (N + 1) - stage wheel core adsorption and desorption machines; The desorption air flow that has completed the desorption function on one wheel core adsorption and desorption machine heats the desorption air flow that is to perform the desorption function on another wheel core adsorption and desorption machine, including: the desorption air flow that has completed the desorption function on the first-stage wheel core adsorption and desorption machine heats the desorption air flow that is to perform the desorption function on the (N + 1)th-stage wheel core adsorption and desorption machine.

6. The refrigeration equipment using waste heat for refrigeration according to any one of claims 3 to 5, characterized in that: The heat rejection recovery area is located between the waste heat heater and the fresh air heat recovery area of another wheel core adsorption and desorption machine. The heat rejection recovery area is used to heat the desorption air flow that has been heated by the fresh air heat recovery area and has not been heated by the waste heat heater on another wheel core adsorption and desorption machine.

7. A refrigeration device using waste heat for refrigeration according to claim 2, characterized in that: The wheel core desorption mechanism includes a desorption air inlet end and a desorption air outlet end. A desorption air inlet filter is provided at the desorption air inlet end, and a desorption fan is provided at the desorption air outlet end; And / or, the dry air generating device includes a fresh air inlet filter, and the external air enters the wheel core adsorption-desorption machine after flowing through the fresh air inlet filter.

8. A control method for refrigeration using waste heat, characterized in that: It is applied to a refrigeration device using waste heat for refrigeration according to any one of claims 1 to 7; The control method includes: A dry air generation step, in which the dry air generating device introduces external air, and the external air sequentially flows through a plurality of the wheel core adsorption-desorption machines to produce dry air. In the wheel core adsorption-desorption machine, the external air first flows through the wheel core adsorption area to increase the temperature and reduce the humidity, and then the external air flows through the fresh air heat recovery area to cool down; An evaporative cooling step, in which the dry air flows through the evaporative cooling mechanism, and the dry air exchanges heat with the object to be cooled through the evaporative cooling mechanism to cool the object to be cooled.

9. A control method for refrigeration using waste heat according to claim 8, characterized in that: The wheel core adsorption-desorption machine includes a wheel core desorption mechanism, and a desorption air flow circulates in the wheel core desorption mechanism. The wheel core desorption mechanism includes a wheel core desorption area corresponding to the wheel core adsorption area and a waste heat heater located on the intake side of the wheel core desorption area. The fresh air heat recovery area is located on the intake side of the waste heat heater, and both the fresh air heat recovery area and the waste heat heater heat the desorption air flow; The wheel core desorption mechanism further includes a heat recovery area located on the outlet side of the wheel core desorption area, and the heat recovery area is located on the intake side of the wheel core desorption area of another wheel core adsorption-desorption machine, so that the desorption air flow that has completed the desorption function on one wheel core adsorption-desorption machine heats the desorption air flow to be desorbed on another wheel core adsorption-desorption machine; The control method includes: A wheel core desorption step, in which the desorption air flow sequentially flows through the fresh air heat recovery area, the waste heat heater and the wheel core desorption area of the same level to regenerate the wheel core desorption.

10. A control method for refrigeration using waste heat according to claim 9, characterized in that: The wheel core desorption mechanism further includes a heat recovery area located on the outlet side of the wheel core desorption area, and the heat recovery area is located on the intake side of the wheel core desorption area of another wheel core adsorption-desorption machine, so that the desorption air flow that has completed the desorption function on one wheel core adsorption-desorption machine heats the desorption air flow to be desorbed on another wheel core adsorption-desorption machine; In the wheel core desorption step, after flowing through the fresh air heat recovery area and before flowing through the waste heat heater, the desorption air flow flows through the heat recovery area of another wheel core desorption machine.

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