A high-temperature cascade heat exchange waste heat recovery device

Abstract

The invention discloses a high-temperature cascade heat exchange waste heat recovery device, which relates to the technical field of heating equipment. The device comprises a starting heat pump unit, a fluorine-fluorine heat exchanger, a warming heat pump unit, a heating water-fluorine heat exchanger, a detachable terminal heat exchanger, a waste water-fluorine heat exchanger, a water inlet pipe and a waste heat pipe for sequential heat exchange; two heat absorption branches of parallel evaporation fins and waste heat recovery pipes are arranged in the evaporation side main passage of the starting heat pump unit, the evaporation fins are controlled by the branch valve B valve to be connected to the main passage, and the waste heat recovery pipe is controlled by the branch valve A valve to be connected to the main passage; only the B valve is opened, and the heat in the air is absorbed by the evaporation fins to heat the water in the water inlet pipe; only the A valve is opened, and the heat of the waste heat pipe is absorbed by the waste heat recovery pipe to heat the water in the water inlet pipe; the dual-function heating of hot water rapid heating and water heating by waste heat recovery is realized, which solves the problem that the heating equipment of small factories cannot recover waste heat and intermittent heating, resulting in low cost performance of heating.

Description

Technical Field

[0001] The present invention relates to the technical field of heating equipment, and in particular to a high-temperature cascade heat exchange waste heat recovery device. Background Art

[0002] In the industrial manufacturing process, hot water supply is a key component in many production links, especially in the food and beverage, textile, pharmaceutical, chemical and other industries. However, for small processing plants, if traditional boiler systems are used to provide hot water / steam for production lines, in actual applications, they will face the problem of low cost performance of heating due to high application costs and low utilization rate of hot water / steam.

[0003] Since traditional boiler systems usually rely on gas, oil or electricity for heating, they have the advantages of high heating efficiency and stable heat supply, and are therefore widely used in various industrial production. However, the application of such systems in small processing plants may have the following disadvantages:

[0004] 1. Intermittent water / steam demand: The hot water / steam demand of many small process plants is intermittent, and the boiler system usually needs to run continuously to maintain the water temperature. This uninterrupted operation mode will lead to serious energy waste in the case of intermittent water / steam use.

[0005] 2. Low water consumption: Small processing plants usually have less hot water / steam demand due to fewer production lines, but the design capacity of the boiler system is often suitable for large-scale production. This mismatch causes the boiler system to consume a lot of energy even under low load conditions.

[0006] 3. Waste heat waste: During the operation of traditional boilers, due to the low production capacity of small factories, hot water / steam cannot be used continuously, which will generate waste heat. However, the existing waste heat recovery equipment is a relatively large system equipment like boilers. Small factories usually do not install waste heat recovery equipment due to cost issues. In order to avoid excessive boiler pressure, pressure relief equipment is usually installed in the pipeline to automatically release pressure in time, which will waste a lot of waste heat. These cannot be effectively recycled and this part of the heat will be wasted, further increasing energy consumption and operating costs.

[0007] 4. Rapid heating needs: Small processing plants may need to obtain hot water quickly during the production process, but the boiler system usually requires a certain amount of preheating time to reach the required temperature and cannot meet the needs of rapid heating.

[0008] In addition to traditional boiler systems, heat pump systems are used in small processing plants. Although they can have higher heating efficiency, they also require a certain amount of preheating time. For production lines that need to quickly obtain hot water but cannot use hot water continuously, the heat pump system will continue to heat to ensure rapid heat extraction but will cause waste of hot water.

[0009] Therefore, in order to achieve efficient heating and meet the needs of small factories, it is necessary to optimize the hot water supply system. While meeting the production needs of intermittent and rapid heating, it is also necessary to significantly reduce energy consumption, so as to reduce heating costs and improve the cost-effectiveness of heating.

[0010] In summary, the applicant has found that the prior art has at least the following technical problems:

[0011] The heating characteristics of existing heating equipment cannot meet the needs of small factories for rapid and intermittent heating. There is no matching small waste heat recovery equipment, and the waste heat cannot be recovered, resulting in energy waste and low cost-effectiveness of heating. Summary of the invention

[0012] The purpose of the present invention is to provide a high-temperature cascade heat exchange waste heat recovery device to solve the problem that the existing heating equipment cannot meet the needs of rapid and intermittent heat use in small factories. There is no matching small waste heat recovery equipment, the waste heat cannot be recovered, there is energy waste, and the cost-effectiveness of heating is low.

[0013] The various technical effects that can be produced by the preferred technical solutions among the various technical solutions provided by the present invention are described in detail below.

[0014] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0015] The present invention provides a high-temperature cascade heat exchange waste heat recovery device, comprising a starting heat pump unit, a fluorofluorine heat exchanger, a warming heat pump unit, a heating water-fluorine heat exchanger, a detachable terminal heat exchanger, a waste water-fluorine heat exchanger, a water inlet pipe and a waste heat pipe for sequential heat exchange; in the evaporation side main passage of the starting heat pump unit, two heat absorption branches with evaporation fins and waste heat recovery pipes are connected in parallel, wherein the evaporation fins are controlled by the B valve in the branch to be connected to the main passage, and the waste heat recovery pipe is controlled by the A valve in the branch to be connected to the main passage; the heat exchange side of the starting heat pump unit and the evaporation side of the warming heat pump unit are connected to the fluorofluorine heat exchanger for heat exchange to transfer the heat of the starting heat pump unit to the warming heat pump unit; the heat exchange side of the warming heat pump unit and the water inlet pipe are connected to the heating water-fluorine heat exchanger for heat exchange to transfer the heat of the warming heat pump unit to the water in the water inlet pipe; the heating The water outlet of the water-fluorine heat exchanger is connected with a water outlet pipe; the waste heat pipe is passed with recovered waste hot water or waste heat steam; the water outlet pipe and the waste heat pipe are connected to the terminal heat exchanger, and are used for heat exchange to transfer the heat of the waste heat pipe to the water outlet pipe, and the outlet water temperature of the water outlet pipe is adjusted by heat exchange; the waste heat pipe and the waste heat recovery pipe are connected to the waste water-fluorine heat exchanger, and are used for heat exchange to transfer the heat in the waste heat pipe to the starting heat pump unit; the waste heat pipe is connected to the water inlet pipe after coming out of the waste water-fluorine heat exchanger; when the B valve is opened and the A valve is closed, the starting heat pump unit absorbs the heat in the air through the evaporating fins, and heats the water in the water inlet pipe through heat exchange; when the B valve is closed and the A valve is opened, the starting heat pump unit absorbs the heat of the waste heat pipe through the waste heat recovery pipe, and heats the water in the water inlet pipe through heat exchange.

[0016] In one of the embodiments, a temperature-controlled flow valve is provided on the water inlet pipe to control the mixed water temperature of the water inlet pipe and the waste heat pipe and the water inlet flow rate entering the heating water-fluorine heat exchanger; a water outlet temperature detection probe and a water outlet valve are installed in sequence on the water outlet pipe along the flow direction of water; wherein the water outlet temperature detection probe is arranged between the heating water-fluorine heat exchanger and the terminal heat exchanger; the water outlet valve is arranged between the terminal heat exchanger and the water outlet of the water outlet pipe; a variable frequency controlled water pump and a steam-water pump are installed in sequence on the waste heat pipe along the flow direction of water separator; wherein, the variable frequency controlled water pump is arranged between the terminal heat exchanger and the inlet of the waste heat pipe; the steam-water separator is arranged between the terminal heat exchanger and the waste water fluorine heat exchanger; the outlet water temperature of the outlet pipe is based on the temperature information fed back by the outlet water temperature detection probe, and the variable frequency controlled water pump is linked to control the return water volume of the waste heat pipe, the temperature control flow valve controls the water inlet volume and water temperature of the heating water fluorine heat exchanger, and the outlet valve controls the water outlet volume of the outlet pipe, controls the heat exchanged by the terminal heat exchanger, and coordinately adjusts the outlet water temperature of the outlet pipe.

[0017] In one embodiment, the water inlet pipe and the waste heat pipe are connected by installing a three-way joint; the temperature control flow valve is arranged between the heating water-fluorine heat exchanger and the three-way joint; wherein, a water inlet pump and a water inlet check valve are installed on the water inlet pipe, and the water inlet check valve and the water inlet pump are arranged between the water inlet end of the water inlet pipe and the three-way joint, and the water inlet check valve is arranged between the three-way joint and the water inlet pump; the water inlet check valve limits the water in the water inlet pipe to flow from the water inlet pump to the three-way joint; a reflux check valve is installed on the waste heat pipe, and the reflux check valve is arranged adjacent to the three-way joint; the reflux check valve limits the waste hot water or waste heat steam in the waste heat pipe to flow from the waste hot water-fluorine heat exchanger to the three-way joint.

[0018] In one of the embodiments, a water circuit pressure controller and a drainage pressure relief branch pipe are installed on the waste heat pipe, the water circuit pressure controller is arranged between the reflux check valve and the waste water fluorine heat exchanger, and the drainage pressure relief branch pipe is arranged between the waste water fluorine heat exchanger and the water circuit pressure controller; a drain valve and a water circuit pressure control solenoid valve are installed in parallel on the drainage pressure relief branch pipe; the water circuit pressure controller detects the pressure in the waste heat pipe, and when the pressure exceeds the safety value, the water circuit pressure control solenoid valve is controlled to open and release the pressure.

[0019] In one embodiment, two independent condensing agent channels are arranged in the fluorofluoro heat exchanger, and are respectively connected to the heat exchange side of the heating heat pump unit and the evaporation side of the warming heat pump unit; the heating heat pump unit also includes a heating compressor, a first throttle valve and a first high-pressure switch; wherein, the first high-pressure switch is arranged on the pipe connecting the heating compressor and the fluorofluoro heat exchanger, and the first throttle valve is arranged on the pipe connecting the fluorofluoro heat exchanger and the main passage before the A valve or the B valve.

[0020] In one embodiment, the heating heat pump unit also includes a heating compressor, a first low-pressure switch, a second high-pressure switch and a second throttle valve; wherein the first low-pressure switch is arranged on the pipe connecting the heating compressor and the fluoro-fluoro heat exchanger, the second high-pressure switch is arranged on the pipe connecting the heating compressor and the heating water-fluorine heat exchanger, and the second throttle valve is arranged on the pipe connecting the heating water-fluorine heat exchanger and the fluoro-fluoro heat exchanger.

[0021] A waste heat recovery method is also provided, wherein the high-temperature cascade heat exchange waste heat recovery device controls the coordinated operation of various components through an installed controller;

[0022] The method comprises the following steps: S1: opening the water inlet of the water inlet pipe, and the water inlet pump controls the water inlet;

[0023] S2: Control the start-up heat pump unit and the warming heat pump unit;

[0024] S3: When starting to produce hot water, the heating heat pump unit runs at full power, and first starts in the initial heating mode with valve B open and valve A closed. The evaporating fins absorb heat from the air, and heat the water in the water inlet pipe through heat exchange in the fluorine-fluorine heat exchanger, the heating heat pump unit, and the heating water-fluorine heat exchanger in sequence;

[0025] S4: Detect the outlet water temperature through the outlet water temperature detection probe, and detect the inlet water flow and temperature through the temperature control flow valve;

[0026] S4.1: When the outlet water temperature is lower than the set value, the controller controls to extend the closing time of the outlet valve, or controls the water inlet pump to reduce the water inlet volume and increase the outlet water temperature;

[0027] S4.2: When the outlet water temperature is higher than the set value, the controller controls to shorten the closing time of the outlet water valve, controls the water inlet pump to increase the water inlet volume, or controls the heating heat pump unit to reduce the operating power to reduce the outlet water temperature;

[0028] S4.3: When the terminal uses water, the controller dynamically coordinates and adjusts the power of the heating heat pump unit, the power of the warming heat pump unit and the water inlet volume of the water inlet pump according to the set water outlet temperature while keeping the water outlet valve open, so as to keep the water outlet temperature stable;

[0029] S5: When the heat pump unit starts to operate in the initial heating mode, the outlet water temperature reaches the set temperature, and after running for a preset time, the heating mode is switched to operate in the waste heat recovery mode with valve B closed and valve A open;

[0030] S6: Open the waste heat pipe, pass waste hot water or waste heat steam, and separate the steam and water in the steam-water separator to stabilize the pressure in the waste heat pipe;

[0031] Heat recovery path 1: The heating heat pump unit absorbs heat through the waste water fluorine heat exchanger, and heats the water in the water inlet pipe through heat exchange in sequence through the fluorine-fluorine heat exchanger, the warming heat pump unit and the heating water-fluorine heat exchanger;

[0032] Heat recovery path 2: After the terminal heat exchanger is installed, waste hot water or waste steam is introduced into the waste heat pipe, and the heat of the waste heat pipe is exchanged with the heat of the outlet pipe through the heat exchange of the terminal heat exchanger to adjust the outlet water temperature;

[0033] Heat recovery path three: After the waste hot water or waste steam introduced into the waste heat pipe absorbs heat through the heating heat pump unit, the remaining hot water is collected into the water inlet pipe through the three-way joint to increase the water inlet temperature;

[0034] S7: The controller controls the heat pump unit, the frequency conversion control water pump, the water inlet pump, the temperature control flow valve, the outlet water temperature detection probe and the outlet water valve to coordinately adjust, so as to coordinately operate the three heat recovery paths of heat recovery path 1, heat recovery path 2 and heat recovery path 3, perform comprehensive waste heat recovery, and finally adjust the outlet water temperature;

[0035] S8: The controller determines whether the heat of the waste hot water or waste heat steam introduced into the waste heat pipe is sufficient to make the outlet water temperature reach the set value according to the outlet water temperature and the operating power of the variable frequency control water pump. If the heat is sufficient, the waste heat recovery mode is maintained; if the heat is insufficient, the initial heating mode is switched to operate.

[0036] An air conditioner is also provided, wherein a plurality of evaporating fins are provided; the plurality of evaporating fins are connected in parallel to the heat absorption branch controlled by the B valve; and the plurality of evaporating fins are separately arranged in rooms that need to be refrigerated.

[0037] In one of the embodiments, an evaporation pressure regulating valve is provided on the pipe between the evaporation fin and the heating compressor, so as to enable the evaporation fins at different temperatures to operate stably at different evaporation pressures.

[0038] In one of the embodiments, the linear spacing between the plurality of evaporating fins is at least greater than or equal to 2 m, so as to ensure that there is sufficient heat absorption between the evaporating fins to increase the evaporation pressure; and the height difference between the evaporating fins and the heating compressor is less than 10 m.

[0039] The beneficial effects of the present invention are as follows:

[0040] The high-temperature cascade heat exchange waste heat recovery equipment has a multi-stage heat exchange system, which is composed of a heating heat pump unit, a fluorine-fluorine heat exchanger, a warming heat pump unit, a heating water-fluorine heat exchanger, a detachable terminal heat exchanger, a waste water-fluorine heat exchanger, a water inlet pipe, a water outlet pipe and a waste heat pipe. These components are connected by specific pipes and valves to achieve efficient heat exchange between different heat sources, so as to realize the function of multiple heat acquisition.

[0041] The core lies in the equipment's thermal cascade heat exchange technology. The starting heat pump unit absorbs heat from the air through evaporating fins and transfers it to the warming heat pump unit. The fluoro-fluoro heat exchanger plays a key role in this process, efficiently transferring the heat from the starting heat pump unit to the warming heat pump unit. Subsequently, the warming heat pump unit further compresses the heat and transfers it to the heating water-fluoro heat exchanger, which heats the water in the water inlet pipe through a large amount of heat, achieving rapid heating of the hot water for immediate use.

[0042] Among them, in the main passage on the evaporation side of the heat pump unit, there are two heat absorption branches with evaporating fins and waste heat recovery pipes in parallel, which are controlled by valve B and valve A respectively. At the initial startup, valve B is opened and valve A is closed. The heat pump unit absorbs heat from the air through the evaporating fins to quickly heat the water in the water inlet pipe. After the equipment has been running for a period of time, the recovered waste heat (hot water / steam) flows back into the waste heat pipe. At this time, valve B is closed and valve A is opened. The heat pump unit absorbs waste heat through the waste heat recovery pipe to heat the water in the water inlet pipe. The equipment uses two different heat acquisition methods to ensure that the equipment can operate efficiently under different working conditions in order to maximize energy efficiency.

[0043] Furthermore, after the equipment has been running for a period of time, the waste heat in the waste heat pipe flows back into the equipment. At this time, the heat pump unit switches the valve to allow the waste heat recovery pipe to absorb the heat in the waste heat pipe and transfer the heat to the water inlet pipe to heat the water, thus realizing the recycling of waste heat; this not only improves energy utilization efficiency, but also effectively reduces energy waste.

[0044] In summary, the high-temperature cascade heat exchange waste heat recovery equipment achieves the dual functions of rapid heating and waste heat recovery through its unique multi-stage heat exchange structure and flexible control method, significantly improves energy utilization efficiency, reduces energy consumption and production costs, and has significant economic and environmental benefits. This equipment will play an important role in the heating application of small factories and provide strong support for achieving energy conservation and emission reduction goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a structural schematic diagram of the high-temperature cascade heat exchange waste heat recovery equipment of the present invention;

[0047] Figure 2 It is a partial structural schematic diagram of the air conditioner of the present invention;

[0048] Figure 3 The present invention is a partial structural schematic diagram of an air conditioner provided with an evaporation pressure regulating valve.

[0049] The reference numerals are as follows:

[0050] 1. Heating heat pump unit; 11. Evaporating fin; 111. B valve; 12. Waste heat recovery pipe; 121. A valve; 13. Heating compressor; 14. First throttle valve; 15. First high-pressure switch; 16. Evaporating pressure regulating valve;

[0051] 2. Fluorine-fluorine heat exchanger;

[0052] 3. Heating heat pump unit; 31. Heating compressor; 32. First low-pressure switch; 33. Second high-pressure switch; 34. Second throttle valve;

[0053] 4. Heating water-fluorine heat exchanger;

[0054] 5. Terminal heat exchanger;

[0055] 6. Waste water fluorine heat exchanger;

[0056] 7. Water inlet pipe; 71. Temperature control flow valve; 72. Three-way connector; 73. Water inlet pump; 74. Water inlet check valve;

[0057] 8. Water outlet pipe; 81. Water outlet temperature detection probe; 82. Water outlet valve;

[0058] 9. Waste heat pipe; 91. Frequency conversion controlled water pump; 92. Steam-water separator; 93. Reflux check valve; 94. Water circuit pressure controller; 95. Drain pressure relief branch pipe; 951. Steam trap; 952. Water circuit pressure control solenoid valve. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0060] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] A high-temperature cascade heat exchange waste heat recovery device is provided in a specific embodiment, which effectively solves the problem that the existing heating equipment cannot meet the needs of rapid and intermittent heat use in small factories. Without a matching small waste heat recovery device, the waste heat cannot be recovered, resulting in energy waste and low cost performance of heating.

[0062] Hereinafter, embodiments will be described with reference to the drawings. Note that all contents of the configurations shown in the following embodiments are not necessarily required as the solution to the invention described in the claims.

[0063] An example of an implementation of a high temperature cascade heat exchange waste heat recovery device is Figure 1As shown, it includes a starting heat pump unit 1, a fluorofluorine heat exchanger 2, a warming heat pump unit 3, a heating water-fluorine heat exchanger 4, a detachable terminal heat exchanger 5, a waste water-fluorine heat exchanger 6, a water inlet pipe 7 and a waste heat pipe 9 for heat exchange in sequence; in the evaporation side main passage of the starting heat pump unit 1, two heat absorption branches of an evaporating fin 11 and a waste heat recovery pipe 12 are connected in parallel, wherein the evaporating fin 11 is controlled by a B valve 111 in the branch to be connected to the main passage, and the waste heat recovery pipe 12 is controlled by an A valve 121 in the branch to be connected to the main passage; the heat exchange side of the starting heat pump unit 1 and the evaporation side of the warming heat pump unit 3 are connected to the fluorofluorine heat exchanger 2 for heat exchange to transfer the heat of the starting heat pump unit 1 to the warming heat pump unit 3 ; The heat exchange side of the heating heat pump unit 3 and the water inlet pipe 7 are connected to the heating water-fluorine heat exchanger 4, which are used for heat exchange to transfer the heat of the heating heat pump unit 3 to the water in the water inlet pipe 7; the water outlet of the heating water-fluorine heat exchanger 4 is connected to the water outlet pipe 8; the waste heat pipe 9 is passed through the recovered waste hot water or waste heat steam; the water outlet pipe 8 and the waste heat pipe 9 are connected to the terminal heat exchanger 5, which are used for heat exchange to transfer the heat of the waste heat pipe 9 to the water outlet pipe 8, and the outlet water temperature of the water outlet pipe 8 is adjusted by heat exchange; the waste heat pipe 9 and the waste heat recovery pipe 12 are connected to the waste hot water-fluorine heat exchanger 6, which are used for heat exchange to transfer the heat in the waste heat pipe 9 to the heating heat pump unit 1; the waste heat pipe 9 is connected to the water inlet pipe 7 after coming out of the waste hot water-fluorine heat exchanger 6.

[0064] Among them, the heating heat pump unit 1 has two heating modes with different heat acquisition methods. This embodiment is shown in the figure. When the B valve 111 is opened and the A valve 121 is closed, the heating heat pump unit 1 absorbs heat from the air through the evaporating fins 11, and heats the water in the water inlet pipe 7 through heat exchange; when the B valve 111 is closed and the A valve 121 is opened, the heating heat pump unit 1 absorbs heat from the waste heat pipe 9 through the waste heat recovery pipe 12, and heats the water in the water inlet pipe 7 through heat exchange.

[0065] (1) Rapid heating and waste heat recovery: The design of the high-temperature cascade heat exchange waste heat recovery equipment enables it to have the dual functions of rapid heating and waste heat recovery. During initial startup, the equipment can quickly absorb heat from the air through the evaporating fins 11, quickly heat the water in the water inlet pipe 7, and meet the factory's immediate demand for hot water. When the equipment enters a stable operating state, the waste heat in the waste heat pipe 9 is effectively recovered to heat the inlet water and produce hot water, further improving the heating efficiency of the equipment and saving energy costs.

[0066] (2) Energy saving and consumption reduction: The equipment effectively reduces energy waste and improves energy utilization through cascade heat exchange and waste heat recovery. Traditional heating equipment often wastes a lot of heat during intermittent heating, while high-temperature cascade heat exchange waste heat recovery equipment reuses this heat through the waste heat recovery system, significantly reducing energy consumption.

[0067] (3) Improve the cost-effectiveness of heating: The efficient operation of high-temperature cascade heat exchange waste heat recovery equipment not only reduces energy costs, but also reduces the additional expenses caused by energy waste. For small factories, this efficient and energy-saving heating equipment can significantly improve the cost-effectiveness of heating, achieve cost reduction and efficiency improvement, and enhance competitiveness.

[0068] (4) Environmental benefits: By reducing energy consumption and improving energy utilization, high-temperature cascade heat exchange waste heat recovery equipment also has significant advantages in reducing greenhouse gas emissions. During the operation of the equipment, waste heat recovery reduces the demand for external energy, thereby reducing carbon footprint and helping to achieve environmental protection goals.

[0069] In summary, the high-temperature cascade heat exchange waste heat recovery equipment achieves the dual functions of rapid heating and waste heat recovery through its unique multi-stage heat exchange structure and flexible control method, significantly improves energy utilization efficiency, reduces energy consumption and production costs, and has significant economic and environmental benefits. This equipment will play an important role in the heating application of small factories and provide strong support for achieving energy conservation and emission reduction goals.

[0070] As one optional implementation method:

[0071] Regarding the mechanism for cooperatively controlling the outlet water temperature of the outlet water pipe 8, this embodiment includes, for example, Figure 1 As shown, a temperature control flow valve 71 is arranged on the water inlet pipe 7, which is used to control the mixed water temperature of the water inlet pipe 7 and the waste heat pipe 9 and the water inlet flow rate entering the heating water-fluorine heat exchanger 4; a water outlet temperature detection probe 81 and a water outlet valve 82 are installed in sequence on the water outlet pipe 8 along the flow direction of water; wherein the water outlet temperature detection probe 81 is arranged between the heating water-fluorine heat exchanger 4 and the terminal heat exchanger 5; the water outlet valve 82 is arranged between the terminal heat exchanger 5 and the water outlet of the water outlet pipe 8; a variable frequency controlled water pump 91 and a steam-water separation device are installed in sequence on the waste heat pipe 9 along the flow direction of water 92; wherein, the variable frequency controlled water pump 91 is arranged between the terminal heat exchanger 5 and the inlet of the waste heat pipe 9; the steam-water separator 92 is arranged between the terminal heat exchanger 5 and the waste water fluorine heat exchanger 6; the outlet water temperature of the outlet pipe 8 is based on the temperature information fed back by the outlet water temperature detection probe 81, and the variable frequency controlled water pump 91 is linked to control the return water volume of the waste heat pipe 9, the temperature control flow valve 71 controls the water inlet volume and water temperature of the heating water fluorine heat exchanger 4, and the outlet valve 82 controls the water outlet volume of the outlet pipe 8, controls the heat exchanged by the terminal heat exchanger 5, and coordinately adjusts the outlet water temperature of the outlet pipe 8.

[0072] Regarding the confluence arrangement of the water inlet pipe 7 and the waste heat pipe 9, this embodiment is as follows Figure 1As shown, the water inlet pipe 7 and the waste heat pipe 9 are connected by installing a three-way joint 72; the temperature control flow valve 71 is arranged between the heating water-fluorine heat exchanger 4 and the three-way joint 72; wherein, a water inlet pump 73 and a water inlet check valve 74 are installed on the water inlet pipe 7, and the water inlet check valve 74 and the water inlet pump 73 are arranged between the water inlet end of the water inlet pipe 7 and the three-way joint 72, and the water inlet check valve 74 is arranged between the three-way joint 72 and the water inlet pump 73; the water inlet check valve 74 restricts the water in the water inlet pipe 7 from flowing from the water inlet pump 73 to the three-way joint 72; a reflux check valve 93 is installed on the waste heat pipe 9, and the reflux check valve 93 is arranged adjacent to the three-way joint 72; the reflux check valve 93 restricts the waste hot water or waste heat steam in the waste heat pipe 9 from flowing from the waste hot water-fluorine heat exchanger 6 to the three-way joint 72.

[0073] Regarding the safety mechanism of the waste heat pipe 9, this embodiment Figure 1 As shown, a water circuit pressure controller 94 and a drainage pressure relief branch pipe 95 are installed on the waste heat pipe 9. The water circuit pressure controller 94 is arranged between the reflux check valve 93 and the waste water fluorine heat exchanger 6, and the drainage pressure relief branch pipe 95 is arranged between the waste water fluorine heat exchanger 6 and the water circuit pressure controller 94; a drain valve 951 and a water circuit pressure control solenoid valve 952 are installed in parallel on the drainage pressure relief branch pipe 95; the water circuit pressure controller 94 detects the pressure in the waste heat pipe 9, and when the pressure exceeds the safety value, the water circuit pressure control solenoid valve 952 is controlled to open and release the pressure.

[0074] During application, when the controller detects through the water pressure controller 94 that the pressure in the waste heat pipe 9 exceeds the safety value, the water pressure controls the solenoid valve 952 and the steam trap 951 to release the pressure; or the pressure is released manually to clean the scale in the waste heat pipe 9.

[0075] Regarding the specific structure of the above-mentioned heating heat pump unit 1, this embodiment Figure 1 As shown, two independent condensing agent channels are arranged in the fluorofluoro heat exchanger 2, and are respectively connected to the heat exchange side of the heating heat pump unit 1 and the evaporation side of the warming heat pump unit 3; the heating heat pump unit 1 also includes a heating compressor 13, a first throttle valve 14 and a first high-pressure switch 15; wherein the first high-pressure switch 15 is arranged on the pipe connecting the heating compressor 13 and the fluorofluoro heat exchanger 2, and the first throttle valve 14 is arranged on the pipe connecting the fluorofluoro heat exchanger 2 and the main passage before the A valve 121 or the B valve 111.

[0076] Regarding the specific structure of the above-mentioned heating heat pump unit 3, this embodiment Figure 1As shown, the heating heat pump unit 3 also includes a heating compressor 31, a first low-pressure switch 32, a second high-pressure switch 33 and a second throttle valve 34; wherein the first low-pressure switch 32 is arranged on the pipe connecting the heating compressor 31 and the fluoro-fluoro heat exchanger 2, the second high-pressure switch 33 is arranged on the pipe connecting the heating compressor 31 and the heating water-fluorine heat exchanger 4, and the second throttle valve 34 is arranged on the pipe connecting the heating water-fluorine heat exchanger 4 and the fluoro-fluoro heat exchanger 2.

[0077] Based on the above embodiment of the high-temperature cascade heat exchange waste heat recovery device, a waste heat recovery method is provided, wherein the high-temperature cascade heat exchange waste heat recovery device controls the coordinated operation of various components through an installed controller;

[0078] The method comprises the following steps: S1: opening the water inlet of the water inlet pipe 7, and the water inlet pump 73 controls the water inlet;

[0079] S2: Control and start the heating heat pump unit 1 and the warming heat pump unit 3;

[0080] S3: When starting to produce hot water, the heating heat pump unit 1 operates at full power, and first starts in the initial heating mode with the B valve 111 open and the A valve 121 closed. The evaporating fins 11 absorb heat from the air, and heat the water in the water inlet pipe 7 through heat exchange in sequence through the fluorine-fluorine heat exchanger 2, the warming heat pump unit 3 and the heating water-fluorine heat exchanger 4;

[0081] S4: Detect the outlet water temperature through the outlet water temperature detection probe 81, and detect the inlet water flow and temperature through the temperature control flow valve 71;

[0082] S4.1: When the outlet water temperature is lower than the set value, the controller controls to extend the closing time of the outlet water valve 82, or controls the water inlet pump 73 to reduce the water inlet amount to increase the outlet water temperature;

[0083] S4.2: When the outlet water temperature is higher than the set value, the controller controls to shorten the closing time of the outlet water valve 82, controls the water inlet pump 73 to increase the water inlet, or controls the heating heat pump unit 1 to reduce the operating power to reduce the outlet water temperature;

[0084] S4.3: When the terminal uses water, while keeping the outlet valve 82 open, the controller dynamically and cooperatively adjusts the power of the heating heat pump unit 1, the power of the warming heat pump unit 3 and the water inlet volume of the water inlet pump 73 according to the set outlet water temperature to keep the outlet water temperature stable;

[0085] S5: When the heat pump unit 1 starts to operate in the initial heating mode, the outlet water temperature reaches the set temperature, and after operating for a preset time, the heating mode is switched to operate in the waste heat recovery mode with the B valve 111 closed and the A valve 121 opened;

[0086] S6: Open the waste heat pipe 9, pass waste heat water or waste heat steam, and separate steam and steam in the steam-water separator 92 to stabilize the pressure in the waste heat pipe 9;

[0087] Heat recovery path 1: The heating heat pump unit 1 absorbs heat through the waste water fluorine heat exchanger 6, and heats the water in the water inlet pipe 7 through heat exchange through the fluorine-fluorine heat exchanger 2, the warming heat pump unit 3 and the heating water fluorine heat exchanger 4 in sequence;

[0088] Heat recovery path 2: After the terminal heat exchanger 5 is installed, waste hot water or waste steam is introduced into the waste heat pipe 9, and heat is exchanged through the terminal heat exchanger 5 to exchange the heat of the waste heat pipe 9 with the heat of the outlet pipe 8 to adjust the outlet water temperature;

[0089] Heat recovery path three: the waste hot water or waste steam introduced into the waste heat pipe 9 absorbs heat through the heating heat pump unit 1, and the remaining hot water is collected into the water inlet pipe 7 through the three-way joint 72 to increase the water inlet temperature;

[0090] S7: The controller controls the heat pump unit 1, the variable frequency controlled water pump 91, the water inlet pump 73, the temperature control flow valve 71, the outlet water temperature detection probe 81 and the outlet water valve 82 to coordinately adjust to coordinately operate the three heat recovery paths of the heat recovery path 1, the heat recovery path 2 and the heat recovery path 3, perform comprehensive waste heat recovery, and finally adjust the outlet water temperature;

[0091] S8: The controller determines whether the heat of the waste hot water or waste heat steam introduced into the waste heat pipe 9 is sufficient to make the water outlet temperature reach the set value according to the water outlet temperature and the operating power of the variable frequency control water pump 91. If the heat is sufficient, the waste heat recovery mode is maintained; if the heat is insufficient, the initial heating mode is switched to operate.

[0092] An embodiment of an air conditioner is as follows Figure 2 As shown, a plurality of evaporating fins 11 are provided; the plurality of evaporating fins 11 are connected in parallel to the heat absorbing branch controlled by the B valve 111; and the plurality of evaporating fins 11 are separately arranged in the rooms that need to be refrigerated.

[0093] During application, high-temperature cascade heat exchange waste heat recovery equipment is needed to provide heating in workshop production. Multiple evaporating fins 11 are arranged and distributed in offices that need cooling. A supply fan is then arranged on the evaporating fins 11 to form an air conditioner that can cool the office or workshop production line. This can reduce the ambient temperature of the staff, provide a good working environment for the staff, save energy for heating and cooling, and achieve multiple benefits of energy saving, environmental protection, and heat recovery.

[0094] As one optional implementation method:

[0095] Regarding the specific configuration of how to ensure that multiple evaporating fins 11 are operated online to cool multiple rooms, this embodiment, for example, Figure 3 As shown, an evaporation pressure regulating valve 16 is provided on the pipe between the evaporation fin 11 and the heating compressor 13, so as to enable the evaporation fins 11 at different temperatures to operate stably at different evaporation pressures.

[0096] During application, an evaporation pressure regulating valve 16 is arranged in the pipeline to prevent the evaporation pressure of the evaporation fin 11 from being too low. When one machine is used to drive an evaporator (evaporation fin 11), the evaporators (evaporation fins 11) in different room temperatures can be stably operated at their respective different evaporation pressures.

[0097] Regarding the specific arrangement between the above-mentioned multiple evaporator fins 11 and between the evaporator fins 11 and the compressor, the straight-line spacing between the multiple evaporator fins 11 is at least greater than or equal to 2m, so as to ensure that there is sufficient heat absorption between the evaporator fins 11 to increase the evaporation pressure; the height difference between the evaporator fins 11 and the heating compressor 13 is less than 10m.

[0098] During application, the setting of the linear spacing between the evaporating fins 11 and the setting of the height difference between the evaporating fins 11 and the heating compressor 13 are used to ensure that the pressure in the pipeline of the evaporating fins 11 is within the rated value to avoid excessive undercooling.

[0099] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described.

[0100] The above is a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered as the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A high-temperature cascade heat exchange waste heat recovery device, characterized in that: It includes a heating heat pump unit, a fluorine-fluorine heat exchanger, a warming heat pump unit, a heating water-fluorine heat exchanger, a detachable terminal heat exchanger, a waste water-fluorine heat exchanger, a water inlet pipe and a waste heat pipe for heat exchange in sequence; In the evaporation side main passage of the heating heat pump unit, two heat absorption branches of evaporation fins and waste heat recovery pipes are connected in parallel, wherein the evaporation fins are connected to the main passage by the control of valve B in the branch, and the waste heat recovery pipe is connected to the main passage by the control of valve A in the branch; The heat exchange side of the heating heat pump unit and the evaporation side of the warming heat pump unit are connected to the fluoro-fluoro heat exchanger for heat exchange to transfer the heat of the heating heat pump unit to the warming heat pump unit; The heat exchange side of the heating heat pump unit and the water inlet pipe are connected to the heating water-fluorine heat exchanger for heat exchange to transfer the heat of the heating heat pump unit to the water in the water inlet pipe; The water outlet of the heating water-fluorine heat exchanger is connected to a water outlet pipe; the waste heat pipe is fed with recycled waste hot water or waste heat steam; the water outlet pipe and the waste heat pipe are connected to the terminal heat exchanger, and are used for heat exchange to transfer the heat of the waste heat pipe to the water outlet pipe, and the outlet water temperature of the water outlet pipe is adjusted by heat exchange; The waste heat pipe and the waste heat recovery pipe are connected to the waste water fluorine heat exchanger for heat exchange to transfer the heat in the waste heat pipe to the heating heat pump unit; The waste heat pipe is connected to the water inlet pipe after coming out of the waste water fluorine heat exchanger; When the B valve is opened and the A valve is closed, the heat pump unit absorbs heat from the air through the evaporating fins and heats the water in the water inlet pipe through heat exchange; When the B valve is closed and the A valve is opened, the heat pump unit absorbs the heat of the waste heat pipe through the waste heat recovery pipe, and heats the water in the water inlet pipe through heat exchange; A temperature control flow valve is provided on the water inlet pipe to control the mixed water temperature of the water inlet pipe and the waste heat pipe and the water inlet flow rate entering the heating water-fluorine heat exchanger; On the water outlet pipe, a water outlet temperature detection probe and a water outlet valve are sequentially installed along the water flow direction; wherein the water outlet temperature detection probe is arranged between the heating water fluorine heat exchanger and the terminal heat exchanger; the water outlet valve is arranged between the terminal heat exchanger and the water outlet of the water outlet pipe; A variable frequency controlled water pump and a steam-water separator are sequentially installed on the waste heat pipe along the water flow direction; wherein the variable frequency controlled water pump is arranged between the terminal heat exchanger and the inlet of the waste heat pipe; the steam-water separator is arranged between the terminal heat exchanger and the waste water fluorine heat exchanger; The outlet water temperature of the outlet pipe is based on the temperature information fed back by the outlet water temperature detection probe, and the frequency conversion control water pump is linked to control the return water volume of the waste heat pipe, the temperature control flow valve controls the water inlet volume and water temperature of the heating water-fluorine heat exchanger, and the outlet valve controls the water outlet volume of the outlet pipe, controls the heat exchanged by the terminal heat exchanger, and coordinately adjusts the outlet water temperature of the outlet pipe; The water inlet pipe and the waste heat pipe are connected by installing a three-way joint; the temperature control flow valve is arranged between the heating water-fluorine heat exchanger and the three-way joint; Wherein, a water inlet pump and a water inlet check valve are installed on the water inlet pipe, and the water inlet check valve and the water inlet pump are arranged between the water inlet end of the water inlet pipe and the three-way joint, and the water inlet check valve is arranged between the three-way joint and the water inlet pump; the water inlet check valve restricts the water in the water inlet pipe from flowing from the water inlet pump to the three-way joint; A reflux check valve is installed on the waste heat pipe, and the reflux check valve is arranged adjacent to the three-way joint; the reflux check valve restricts the waste heat or waste heat steam in the waste heat pipe from flowing from the waste heat water fluorine heat exchanger to the three-way joint; When starting to produce hot water, the heating heat pump unit runs at full power, and first starts in the initial heating mode with valve B open and valve A closed. The evaporating fins absorb heat from the air, and heat the water in the water inlet pipe through heat exchange in the fluorine-fluorine heat exchanger, the heating heat pump unit, and the heating water-fluorine heat exchanger in sequence. When the heat pump unit starts running in the initial heating mode, the outlet water temperature reaches the set temperature, and after running for a preset time, the heating mode is switched to the waste heat recovery mode with valve B closed and valve A open.

2. The high-temperature cascade heat exchange waste heat recovery equipment according to claim 1, characterized in that: The waste heat pipe is provided with a water circuit pressure controller and a drainage pressure relief branch pipe, wherein the water circuit pressure controller is arranged between the reflux check valve and the waste water fluorine heat exchanger, and the drainage pressure relief branch pipe is arranged between the waste water fluorine heat exchanger and the water circuit pressure controller; A steam trap and a waterway pressure control solenoid valve are installed in parallel on the drainage and pressure relief branch pipe; The pressure in the waste heat pipe is detected by the water circuit pressure controller, and when the pressure exceeds a safety value, the water circuit pressure control solenoid valve is controlled to open and release the pressure.

3. The high-temperature cascade heat exchange waste heat recovery equipment according to claim 1, characterized in that: Two independent condensing agent channels are arranged in the fluoro-fluoro heat exchanger, and are respectively connected to the heat exchange side of the heating heat pump unit and the evaporation side of the warming heat pump unit; The heating heat pump unit also includes a heating compressor, a first throttle valve and a first high-pressure switch; wherein the first high-pressure switch is arranged on a pipe connecting the heating compressor and the fluorofluoro heat exchanger, and the first throttle valve is arranged on a pipe connecting the fluorofluoro heat exchanger and the main passage before the A valve or the B valve.

4. The high-temperature cascade heat exchange waste heat recovery equipment according to claim 3 is characterized in that: The heating heat pump unit also includes a heating compressor, a first low-pressure switch, a second high-pressure switch and a second throttle valve; wherein the first low-pressure switch is arranged on the pipe connecting the heating compressor and the fluoro-fluoro heat exchanger, the second high-pressure switch is arranged on the pipe connecting the heating compressor and the heating water-fluorine heat exchanger, and the second throttle valve is arranged on the pipe connecting the heating water-fluorine heat exchanger and the fluoro-fluoro heat exchanger.

5. A waste heat recovery method for a high-temperature cascade heat exchange waste heat recovery device according to claim 4, characterized in that: The high-temperature cascade heat exchange waste heat recovery equipment controls the coordinated operation of various components through an installed controller; The following steps are involved: S1: Open the water inlet pipe, and the water inlet pump controls the water inlet; S2: Control the start-up heat pump unit and the warming heat pump unit; S3: When starting to produce hot water, the heating heat pump unit runs at full power, and first starts in the initial heating mode with valve B open and valve A closed. The evaporating fins absorb heat from the air, and heat the water in the water inlet pipe through heat exchange in the fluorine-fluorine heat exchanger, the heating heat pump unit, and the heating water-fluorine heat exchanger in sequence; S4: Detect the outlet water temperature through the outlet water temperature detection probe, and detect the inlet water flow and temperature through the temperature control flow valve; S4.1: When the outlet water temperature is lower than the set value, the controller controls to extend the closing time of the outlet valve, or controls the water inlet pump to reduce the water inlet volume and increase the outlet water temperature; S4.2: When the outlet water temperature is higher than the set value, the controller controls to shorten the closing time of the outlet water valve, controls the water inlet pump to increase the water inlet volume, or controls the heating heat pump unit to reduce the operating power to reduce the outlet water temperature; S4.3: When the terminal uses water, the controller dynamically coordinates and adjusts the power of the heating heat pump unit, the power of the warming heat pump unit and the water inlet volume of the water inlet pump according to the set water outlet temperature while keeping the water outlet valve open, so as to keep the water outlet temperature stable; S5: When the heat pump unit starts to operate in the initial heating mode, the outlet water temperature reaches the set temperature, and after running for a preset time, the heating mode is switched to operate in the waste heat recovery mode with valve B closed and valve A open; S6: Open the waste heat pipe, pass waste hot water or waste heat steam, and separate the steam and water in the steam-water separator to stabilize the pressure in the waste heat pipe; Heat recovery path 1: The heating heat pump unit absorbs heat through the waste water fluorine heat exchanger, and heats the water in the water inlet pipe through heat exchange in sequence through the fluorine-fluorine heat exchanger, the warming heat pump unit and the heating water-fluorine heat exchanger; Heat recovery path 2: After the terminal heat exchanger is installed, waste hot water or waste steam is introduced into the waste heat pipe, and the heat of the waste heat pipe is exchanged with the heat of the outlet pipe through the heat exchange of the terminal heat exchanger to adjust the outlet water temperature; Heat recovery path three: After the waste hot water or waste steam introduced into the waste heat pipe absorbs heat through the heating heat pump unit, the remaining hot water is collected into the water inlet pipe through the three-way joint to increase the water inlet temperature; S7: The controller controls the heat pump unit, the frequency conversion control water pump, the water inlet pump, the temperature control flow valve, the outlet water temperature detection probe and the outlet water valve to coordinately adjust, so as to coordinately operate the three heat recovery paths of heat recovery path 1, heat recovery path 2 and heat recovery path 3, perform comprehensive waste heat recovery, and finally adjust the outlet water temperature; S8: The controller determines whether the heat of the waste hot water or waste heat steam introduced into the waste heat pipe is sufficient to make the outlet water temperature reach the set value according to the outlet water temperature and the operating power of the variable frequency control water pump. If the heat is sufficient, the waste heat recovery mode is maintained; if the heat is insufficient, the initial heating mode is switched to operate.

6. An air conditioner with a high-temperature cascade heat exchange waste heat recovery device according to claim 4, characterized in that: The evaporating fins are provided in plurality; the plurality of evaporating fins are connected in parallel to the heat absorbing branch controlled by the B valve; The plurality of evaporating fins are separately arranged in rooms that need to be refrigerated.

7. The air conditioner according to claim 6, characterized in that: An evaporation pressure regulating valve is provided on the pipe between the evaporation fin and the heating compressor, so as to enable the evaporation fins at different temperatures to operate stably at different evaporation pressures.

8. The air conditioner according to claim 6, characterized in that: The linear spacing between the plurality of evaporation fins is at least greater than or equal to 2 m, so as to ensure that there is sufficient heat absorption between the evaporation fins to increase the evaporation pressure; The height difference between the evaporating fin and the heating compressor is less than 10m.

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