High-temperature heat pump with multi-stage heating function and high-temperature hot air system

Abstract

The utility model discloses a high-temperature heat pump and a high-temperature hot air system with multistage heating, the high-temperature heat pump comprises a heating circulation system, a first heating pipeline, a second heating pipeline and an evaporation system, the heating circulation system comprises a compressor, a first condensing coil, a second condensing coil, a throttling expansion valve and an evaporation coil, each first condensing coil is mounted in the second heating pipeline, each second condensing coil is mounted in the first heating pipeline, the tail end of the first heating pipeline is connected with the head end of the second heating pipeline to form a multi-stage heating system, and each evaporation coil is mounted in the evaporation system. According to the high-temperature heat pump, the characteristics of the heat pump and waste gas are combined, the first condensing coil and the second condensing coil are combined with the first heating pipeline and the second heating pipeline, a multi-stage heating system is formed, high-temperature hot air can meet the requirements of customers, meanwhile, waste heat of the waste gas can be recycled, and therefore energy consumption of hot air equipment is reduced; and the optimal waste heat recovery effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, and in particular to a high-temperature heat pump with multi-stage heating and a high-temperature hot air system. Background Art

[0002] Heat pump is a highly efficient energy-saving device that fully utilizes low-grade thermal energy. Heat can be transferred spontaneously from a high-temperature object to a low-temperature object, but not spontaneously in the opposite direction. The working principle of a heat pump is a mechanical device that forces heat to flow from a low-temperature object to a high-temperature object in a reverse cycle. It consumes only a small amount of reverse cycle net work to obtain a large amount of heat supply, and can effectively utilize the low-grade thermal energy that is difficult to use to achieve energy saving.

[0003] Heat pumps are divided into air source heat pumps, water source heat pumps, ground source heat pumps, dual source heat pumps (combination of water source heat pumps and air source heat pumps), etc. Heat pumps such as air source heat pumps and water source heat pumps can also be used in various industries to recycle waste gas and wastewater, but there are still relatively few cases of this application.

[0004] At present, some equipment requires high-temperature hot air of about 120°C, which is generally heated by gas boilers, electric boilers, etc., and then heated to the required temperature by the introduced air, and then transported to the hot air unit. The waste gas after use is directly discharged, but the temperature of the waste gas is still very high, and there is 70-80°C of waste heat that is not used. The generally used heat recovery method is to use part of the waste gas as regeneration air, divert it to the fresh air heating system, and heat it again to achieve resource reuse. In the above hot air recovery scheme, due to the external discharge of high-calorie hot air, there is still waste heat that is not fully recovered, resulting in waste of resources. The current maximum heating temperature of the heat pump is 80-100°C, and the temperature of the hot air after heat exchange is lower, which often does not reach the customer's high-temperature hot air of about 120°C. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, one of the purposes of the utility model is to provide a high-temperature heat pump with multi-stage heating to solve the above-mentioned traditional problems. It combines the heat pump and the exhaust gas, and recovers the waste heat of the exhaust gas through multi-stage heating to reduce the energy consumption of hot air equipment and achieve the optimal waste heat recovery effect.

[0006] The second object of the utility model is to provide a high-temperature hot air system using the high-temperature heat pump with multi-stage heating.

[0007] One of the purposes of the utility model is achieved by the following technical solution:

[0008] A high-temperature heat pump with multi-stage heating includes a plurality of heating circulation systems, a first heating pipe, a second heating pipe and an evaporation system arranged in sequence. The heating circulation system includes a compressor, a first condensing coil, a second condensing coil, a throttling expansion valve and an evaporation coil connected end to end in the direction of refrigerant flow. Each of the first condensing coils is installed in the second heating pipe in sequence, and each of the second condensing coils is installed in the first heating pipe in sequence. The tail end of the first heating pipe is connected to the head end of the second heating pipe to form a multi-stage heating system, and each of the evaporation coils is installed in the evaporation system in sequence.

[0009] Preferably, the heating cycle system further includes a high-temperature storage tank, and the high-temperature storage tank is arranged between the first condensing coil and the second condensing coil.

[0010] Preferably, the first condensing coil and the second condensing coil are both finned heat exchange coils.

[0011] Preferably, the heating cycle system further includes a gas-liquid separator, an oil separator and a pipeline filter, the gas-liquid separator is arranged at the air inlet end of the compressor, the oil separator is arranged at the air outlet end of the compressor, and the pipeline filter is arranged at the air outlet end of the second condensing coil.

[0012] Preferably, the oil separator is provided with an oil return pipeline, and one end of the oil return pipeline is connected to the inlet end of the compressor.

[0013] Preferably, the compressor, the first condensing coil, the second condensing coil, the first heating pipe and the second heating pipe are integrated in the same skid-mounted module to form a main unit group, the inlet of the main unit group is provided with a plurality of first connecting inlets, and the outlet of the main unit group is provided with a plurality of first connecting outlets; the throttling expansion valve and the evaporating coil are integrated in the same skid-mounted module to form an evaporating module, the outlet of the evaporating module is provided with a plurality of second connecting outlets, the inlet of the evaporating module is provided with a plurality of second connecting inlets, the second connecting outlets are connected with the first connecting inlet, and the second connecting inlet is connected with the first connecting outlet.

[0014] Preferably, the compressor is a fixed-frequency compressor.

[0015] Preferably, the compressor is a variable frequency compressor.

[0016] Preferably, the evaporating coil is a finned heat exchange coil.

[0017] The second purpose of the utility model is achieved by the following technical solution:

[0018] A high-temperature hot air system comprises the high-temperature heat pump with multi-stage heating as described above.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The high-temperature heat pump of the utility model combines the characteristics of the heat pump and the exhaust gas, and utilizes the first condensing coil, the second condensing coil, the first heating pipe and the second heating pipe to form a multi-stage heating system, so that the high-temperature hot air can meet the customer's requirements. At the same time, the waste heat of the exhaust gas can be recovered to reduce the energy consumption of the hot air equipment and achieve the optimal waste heat recovery effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the process flow of the high-temperature heat pump with multi-stage heating of the utility model;

[0022] Figure 2 for Figure 1 The process flow diagram of a single heating cycle system shown;

[0023] Figure 3 The present invention is a process flow diagram of a specific implementation case.

[0024] In the figure: 10, heating circulation system; 11, compressor; 12, first condensing coil; 13, second condensing coil; 14, throttling expansion valve; 15, evaporating coil; 16, high-temperature storage tank; 17, gas-liquid separator; 18, oil separator; 19, pipeline filter; 20, first heating pipeline; 30, second heating pipeline; 40, evaporation system; 50, main unit; 51, first connecting inlet; 52, first connecting outlet; 60, evaporation module; 61, second connecting outlet; 62, second connecting inlet. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0026] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the description of the present utility model, it is necessary to understand that when an element is considered to be "connected" to another element, it may be directly connected to another element or there may be intermediate elements at the same time. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0028] See also Figure 1 and Figure 2 , which is a high-temperature heat pump with multi-stage heating in a preferred embodiment of the utility model, is used for recycling hot air, preparing high-temperature hot air, and can also prepare hot air by recycling hot water, etc. Specifically, the high-temperature heat pump includes a plurality of heating circulation systems 10, a first heating pipe 20, a second heating pipe 30 and an evaporation system 40 arranged in sequence. The heating circulation system 10 includes a compressor 11, a first condensing coil 12, a second condensing coil 13, a throttling expansion valve 14 and an evaporation coil 15 which are connected end to end in the flow direction of the refrigerant. Each first condensing coil 12 is installed in the second heating pipe 30 in sequence along the wind direction, and each second condensing coil 13 is installed in the first heating pipe 20 in sequence along the wind direction. The tail end of the first heating pipe 20 is connected to the head end of the second heating pipe 30 to form a multi-stage heating system, and each evaporation coil 15 is installed in the evaporation system 40 in sequence along the wind direction or along the liquid flow direction to form a multi-stage heat absorption system.

[0029] In this embodiment, the head end of the first heating pipe 20 is used to connect to the user's waste gas exhaust port, the tail end of the second heating pipe 30 is used to connect to the user's hot air utilization unit, the head end of the second heating pipe 30 is used to connect to the user's waste gas / waste liquid pipeline, and the tail end of the second heating pipe 30 is used to connect to the user's discharge unit to discharge the waste gas and waste liquid after cooling and utilization. In other embodiments, heat exchange can be performed by replacing waste gas with waste liquid.

[0030] The above-mentioned high-temperature heat pump combines the characteristics of the heat pump and the exhaust gas, and utilizes the first condensing coil 12, the second condensing coil 13 in combination with the first heating pipe 20 and the second heating pipe 30 to form a multi-stage heating system, so that the high-temperature hot air can meet the customer's requirements. At the same time, the waste heat of the exhaust gas can be recovered to reduce the energy consumption of the hot air equipment and achieve the optimal waste heat recovery effect.

[0031] In one embodiment, the heating cycle system 10 also includes a high-temperature storage tank 16, which is arranged between the first condensing coil 12 and the second condensing coil 13, and is used to buffer the high-temperature refrigerant between the first condensing coil 12 and the second condensing coil 13, so as to facilitate heat exchange between the hot air of each coil and the pipeline, so as to improve the heat exchange effect.

[0032] Optionally, the first condensing coil 12 and the second condensing coil 13 are both finned heat exchange coils, and the refrigerant is selected according to specific heat exchange requirements, which will not be described one by one here.

[0033] In one embodiment, the heating cycle system 10 also includes a gas-liquid separator 17, an oil separator 18 and a pipe filter 19. The gas-liquid separator 17 is arranged at the air inlet end of the compressor 11, and is used to remove liquid in the gaseous refrigerant to improve the stability of the compressor 11. The oil separator 18 is arranged at the air outlet end of the compressor 11, and is used to remove oil and gas carried by the compressor 11. The pipe filter 19 is arranged at the air outlet end of the second condensing coil 13, and is used to remove impurities in the coil.

[0034] Optionally, the oil separator 18 is provided with an oil return pipe, one end of which is connected to the inlet end of the compressor 11 to return the removed oil to the compressor 11 .

[0035] In this embodiment, the compressor 11, the first condensing coil 12, the second condensing coil 13, the high-temperature storage tank 16, the gas-liquid separator 17, the oil separator 18, the pipeline filter 19, the first heating pipeline 20, and the second heating pipeline 30 are integrated in the same skid-mounted module to form a main unit 50. The inlet of the oil separator 18 of the main unit 50 is provided with a plurality of first connecting inlets 51, and the outlet of the pipeline filter 19 of the main unit 50 is provided with a plurality of first connecting outlets 52. The throttling expansion valve 14 and the evaporating coil 15 are integrated in the same skid-mounted module to form an evaporating module 60. The outlet of the evaporating coil 15 of the evaporating module 60 is provided with a plurality of second connecting outlets 61, and the inlet of the throttling expansion valve 14 of the evaporating module 60 is provided with a plurality of second connecting inlets 62. The second connecting outlet 61 is connected with the first connecting inlet 51, and the second connecting inlet 62 is connected with the first connecting outlet 52, so that each module can be independently transported in batches and then connected on site to improve the assembly efficiency of the equipment.

[0036] In one embodiment, the compressor 11 is a fixed frequency compressor 11, and the specific frequency can be selected according to user requirements so that each temperature point can meet the qualitative requirements. In other embodiments, the compressor 11 can also select a variable frequency compressor 11, and adjust the operating frequency according to the set temperature value to improve the adaptability of the unit.

[0037] Optionally, the evaporating coil 15 is a finned heat exchange coil, and the specific parameters and number of turns are set according to user needs and will not be described here.

[0038] In other embodiments, the high-temperature heat pump further includes a control system, a temperature detector and a pressure detector electrically connected to the control system. The temperature detector and the pressure detector are arranged on the heating cycle system 10, the first heating pipe 20, the second heating pipe 30 and the evaporation system 40 according to the needs. The specific arrangement is as follows: Figure 1 The control system is automatically adjusted according to the PID control system.

[0039] For example Figure 3 As shown, according to the user's exhaust gas temperature (divided into two types of regeneration air: one is 47°C regeneration air, the other is 74°C regeneration air), the number of the heating cycle system 10 is 4 groups to form 8 levels of hot air heating and 4 levels of evaporative heat absorption, wherein the regeneration air in the heating system is heated from 47°C to 120°C, and the heat source in the heat absorption system is 74°C regeneration air, so that the condensing temperature of the entire unit is reduced as much as possible, and the evaporation temperature is increased as much as possible, so as to achieve the purpose of improving the COP value of the unit.

[0040] In other embodiments, the utility model also provides a high-temperature hot air system, including the above-mentioned high-temperature heat pump with multi-stage heating and related connecting pipes, which are used to recover exhaust gas for users, and then utilize the waste heat of the exhaust gas to heat the regenerated air to obtain high-temperature hot air with the required heat.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high temperature heat pump with multi-stage heating, characterized in that: It includes multiple heating circulation systems, first heating pipes, second heating pipes and evaporation systems arranged in sequence. The heating circulation system includes a compressor, a first condensing coil, a second condensing coil, a throttling expansion valve and an evaporation coil connected end to end in the direction of refrigerant flow. Each of the first condensing coils is installed in the second heating pipe in sequence, and each of the second condensing coils is installed in the first heating pipe in sequence. The tail end of the first heating pipe is connected to the head end of the second heating pipe to form a multi-stage heating system, and each of the evaporation coils is installed in the evaporation system in sequence.

2. The high temperature heat pump with multi-stage heating according to claim 1, characterized in that: The heating cycle system further includes a high temperature storage tank, and the high temperature storage tank is arranged between the first condensing coil and the second condensing coil.

3. The high temperature heat pump with multi-stage heating according to claim 2, characterized in that: The first condensing coil and the second condensing coil are both finned heat exchange coils.

4. The high temperature heat pump with multi-stage heating according to claim 1, characterized in that: The heating cycle system also includes a gas-liquid separator, an oil separator and a pipeline filter. The gas-liquid separator is arranged at the air inlet end of the compressor, the oil separator is arranged at the air outlet end of the compressor, and the pipeline filter is arranged at the air outlet end of the second condensing coil.

5. The high temperature heat pump with multi-stage heating according to claim 4, characterized in that: The oil separator is provided with an oil return pipeline, and one end of the oil return pipeline is connected to the inlet end of the compressor.

6. The high temperature heat pump with multi-stage heating according to claim 1, characterized in that: The compressor, the first condensing coil, the second condensing coil, the first heating pipe, and the second heating pipe are integrated in the same skid-mounted module to form a main unit. The inlet of the main unit is provided with a plurality of first connecting inlets, and the outlet of the main unit is provided with a plurality of first connecting outlets; the throttling expansion valve and the evaporating coil are integrated in the same skid-mounted module to form an evaporating module. The outlet of the evaporating module is provided with a plurality of second connecting outlets, and the inlet of the evaporating module is provided with a plurality of second connecting inlets, the second connecting outlets are connected with the first connecting inlet, and the second connecting inlet is connected with the first connecting outlet.

7. The high temperature heat pump with multi-stage heating according to claim 1, characterized in that: The compressor is a fixed-frequency compressor.

8. The high temperature heat pump with multi-stage heating according to claim 1, characterized in that: The compressor is a variable frequency compressor.

9. The high temperature heat pump with multi-stage heating according to claim 1, characterized in that: The evaporating coil is a finned heat exchange coil.

10. A high temperature hot air system, characterized in that: It comprises a high-temperature heat pump with multi-stage heating as described in any one of claims 1 to 9.

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