CN107246749B - Industrial ultra-temperature heat pump unit - Google Patents
Industrial ultra-temperature heat pump unit Download PDFInfo
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- CN107246749B CN107246749B CN201710553395.1A CN201710553395A CN107246749B CN 107246749 B CN107246749 B CN 107246749B CN 201710553395 A CN201710553395 A CN 201710553395A CN 107246749 B CN107246749 B CN 107246749B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- Applications Or Details Of Rotary Compressors (AREA)
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Abstract
The invention discloses an industrial ultra-temperature heat pump unit, wherein a main refrigerant circulation loop of the heat pump unit is mainly formed by connecting a compressor, a condenser, a booster, a main throttling device and an evaporator; the main refrigerant outlet of the booster is also connected with a motor cooling circulation loop, an oil cooling circulation loop and a refrigerant booster loop, wherein the motor cooling circulation loop is mainly provided with a cooler and an ejector, and the oil cooling circulation loop is mainly provided with an oil separator, an oil circulation pump, an oil cooler and a drying filter. The industrial ultra-temperature heat pump unit has good cooling effect of the compressor motor and long service life; the lubricating oil supply temperature is low, and pyrolysis is avoided; the supercooling degree of the main refrigerant is increased, the heating quantity is increased, and the exhaust temperature of the compressor is reduced. The industrial ultra-temperature heat pump unit has high heating water outlet temperature and stable and reliable operation.
Description
Technical Field
The invention relates to the technical field of heat pumps of thermal energy engineering, in particular to an industrial ultra-temperature heat pump unit.
Background
On the one hand, the traditional heat supply mode supplies heat in a mode of burning fossil fuel and even directly heating electrically, so that huge available energy is dissipated. On the other hand, in various industrial production processes, a large amount of waste heat resources are associated, the temperature is more than 50 ℃, if the low-grade heat energy cannot be effectively utilized, a large amount of energy resources are wasted, and the heat pollution to the environment is caused when the low-grade heat energy is discharged to the environment. In order to fully recycle waste heat resources in an industrial production process, a heat pump device has been widely used in the industrial production process.
At present, the temperature of heating water outlet of a common heat pump device is more than 80 ℃, and for the condition that the temperature of heating water outlet is required to be higher, for example, more than 100 ℃, the heat pump device mainly faces the problems of high exhaust temperature of a compressor, pyrolysis of lubricating oil, poor cooling of a compressor motor and the like, so that the heat pump unit cannot stably and reliably operate.
Disclosure of Invention
In view of this, the technical problems to be solved by the present invention are: the industrial ultra-temperature heat pump unit with good motor cooling effect is provided, and the stable and reliable operation of the heat pump unit is ensured.
In order to solve the technical problems, the technical scheme of the invention is as follows: the industrial ultra-temperature heat pump unit comprises a compressor, a condenser, a booster, a main throttling device and an evaporator;
the compressor, the condenser, the booster, the main throttling device and the evaporator are connected to form a main refrigerant circulation loop; in the main refrigerant circulation loop, a liquid outlet of the condenser is connected with a main refrigerant inlet of the booster, and a main refrigerant outlet of the booster is connected with the main throttling device;
the heat pump unit is provided with a motor cooling circulation loop, a cooler is arranged in the motor cooling circulation loop, a main refrigerant outlet of the booster is connected with an inlet of the cooler, and an outlet of the cooler is connected with a liquid inlet of a motor shell of the compressor.
The following are further improvements to the industrial ultra-high temperature heat pump unit of the present invention:
the motor cooling circulation loop is also provided with an ejector, an ejected medium inlet of the ejector is connected with a motor shell outlet of the compressor, an ejection source inlet of the ejector is connected with an exhaust port of the compressor, and an outlet of the ejector is connected with an inlet of the evaporator.
Wherein the motor shell outlet comprises a liquid outlet and an air outlet; the two ejectors are connected in parallel, wherein one ejected medium inlet of the ejectors is connected with a liquid outlet of the motor casing, and the other ejected medium inlet of the ejectors is connected with a gas outlet of the motor casing.
An oil separator is arranged in the main refrigerant circulation loop, an air inlet of the oil separator is connected with an air outlet of the compressor, and an air outlet of the oil separator is connected with an air inlet of the condenser;
the heat pump unit is provided with an oil cooling circulation loop, an oil cooler is arranged in the oil cooling circulation loop, a main refrigerant outlet of the booster is connected with a liquid inlet of the oil cooler, and an air outlet of the oil cooler is connected with an air suction port of the compressor; an oil inlet of the oil cooler is connected with an oil outlet of the oil separator, and an oil outlet of the oil cooler is connected with an oil inlet of the compressor.
An oil circulation pump is arranged in an oil way for connecting an oil inlet of the oil cooler with an oil outlet of the oil separator.
And an oil way in which the oil outlet of the oil cooler is connected with the oil inlet of the compressor is provided with a drying filter, and the drying filter is connected with an oil differential pressure switch in parallel.
Two oil ways are connected in parallel between the drying filter and the compressor, one oil way is connected with a main oil inlet of the compressor, and the other oil way is connected with a screw oil injection port of the compressor.
The main refrigerant outlet of the booster is connected with the auxiliary refrigerant inlet of the booster, and the auxiliary refrigerant outlet of the booster is connected with the medium-pressure inlet of the compressor to form a refrigerant booster loop.
The main throttling device is a main throttling valve group, the main throttling valve group comprises two or more combined valve units which are connected in parallel, and each combined valve unit comprises an electromagnetic valve and a throttling valve which are connected in series.
Wherein the condenser comprises a reboiler.
After the technical scheme is adopted, the beneficial effects of the invention are as follows:
(1) The heat pump unit is provided with the motor cooling circulation loop, the motor cooling circulation loop is provided with the cooler, after the refrigerant is cooled and supercooled further by the cooler, the refrigerant is directly sprayed into the motor shell through the liquid inlet of the motor shell of the compressor, and the cooling of the motor coil of the compressor adopts an evaporation cooling mode of directly spraying liquid, so that the phase change heat exchange of the refrigerant is utilized, the heat exchange coefficient is high, the cooling effect is good, and the problems of low heat exchange coefficient and poor cooling effect of the traditional air suction cooling mode are solved; because the ejector is arranged in the motor cooling circulation loop, the pressure in the motor shell is reduced to be lower than the evaporation pressure through the ejector effect of the ejector, and the refrigerant in the motor shell has lower evaporation temperature, so that more refrigerant is subjected to phase change evaporation, the cooling effect of a motor coil is ensured, the service life of a compressor motor is prolonged, and the reliable and stable operation of a unit is ensured.
(2) Because the heat pump unit is provided with the oil cooling circulation loop, be provided with the oil cooler in the oil cooling circulation loop, the heat of lubricating oil is absorbed when the refrigerant passes through the oil cooler, reduces the temperature of oil, has guaranteed lower fuel feeding temperature, has retrieved the cold heat loss of oil when avoiding the pyrolysis of oil, has increased the heating capacity and the energy efficiency of unit, has improved the reliability of unit.
(3) The heat pump unit is provided with the refrigerant synergistic loop, and the synergistic device not only increases the supercooling degree of the main refrigerant and reduces the temperature of the refrigerant entering the motor shell, but also recovers part of heat and improves the energy efficiency of the unit; the medium-pressure gas in the refrigerant is sent to the medium-pressure inlet of the compressor, the exhaust gas quantity and heating quantity are increased, the exhaust gas temperature of the compressor is reduced, and the pyrolysis of lubricating oil is avoided.
(4) Because the reboiler at the bottom of the petroleum refining fractionating tower can be directly used as a condenser to directly heat the fractionated raw material liquid, the circulating energy consumption of middle water is saved, the secondary heat exchange is avoided, the heat transfer temperature difference is increased, and the energy efficiency of the unit is improved.
In summary, the industrial ultra-temperature heat pump unit solves the problem of poor motor cooling effect by arranging the motor cooling circulation loop; by arranging the oil cooling circulation loop, the oil supply temperature is reduced, and the pyrolysis of lubricating oil is avoided; by arranging the refrigerant synergistic loop, the supercooling degree of the main refrigerant is increased, the temperature of the refrigerant entering the motor shell is reduced, part of heat is recovered, the heating quantity is increased, the exhaust temperature of the compressor is reduced, and pyrolysis of lubricating oil is avoided. The industrial ultra-temperature heat pump unit has long service life of the compressor motor, stable and reliable operation of the heat pump unit and high heating water outlet temperature which can reach 130-170 ℃.
Drawings
FIG. 1 is a schematic diagram of an industrial ultra-high temperature heat pump unit according to an embodiment of the present invention;
in the figure: 1. a compressor; 2. an oil separator; 3. a condenser; 4-1, drying and filtering; 4-2, drying the filter; 5. a booster; 6. a main throttle device; 7. an evaporator; 8. a cooler; 9-1, a throttle valve; 9-2, a throttle valve; 9-3, a throttle valve; 10-1, an ejector; 10-2, an ejector; 11. an oil cooler; 12. an oil differential pressure switch; 13-1, an electromagnetic valve; 13-2, an electromagnetic valve; 13-3, an electromagnetic valve; 13-4, an electromagnetic valve; 13-5, electromagnetic valve; 13-6, an electromagnetic valve; 13-7, an electromagnetic valve; 14-1, a stop valve; 14-2, a stop valve; 14-3, a stop valve; 14-4, a stop valve; 14-5, a stop valve; 14-6, a stop valve; 14-7, a stop valve; 14-8, a stop valve; 14-9, a stop valve; 14-10, a stop valve; 15. and an oil circulation pump.
The arrows in the figure indicate the flow direction of the fluid.
Detailed Description
The following description of the embodiments of the invention is given by way of further non-limiting illustration in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the term "connected" should be interpreted broadly, and may be a direct connection between connected components or an indirect connection via an intermediary, and the meaning of the term may be interpreted by those skilled in the art according to the specific circumstances.
As shown in fig. 1, the industrial ultra-temperature heat pump unit of the present invention mainly comprises: the oil separator comprises a compressor 1, an oil separator 2, a condenser 3, a dry filter, a booster 5, a main throttling device 6, an evaporator 7, a cooler 8, an ejector, an oil cooler 11, an oil circulating pump 15, a plurality of electromagnetic valves, a stop valve and the like.
The air outlet of the compressor 1 is connected with the air inlet of the oil separator 2 through a stop valve 14-4, the air outlet of the oil separator 2 is connected with the air inlet of the condenser 3, the liquid outlet of the condenser 3 is connected with the main refrigerant inlet of the booster 5 through a stop valve 14-7 and a dry filter 4-1 in sequence, and the main refrigerant outlet of the booster 5 is divided into four paths which are a main refrigerant circulation loop, a motor cooling circulation loop, an oil cooling circulation loop and a refrigerant synergistic loop respectively.
The first path is a main refrigerant circulation loop, and is connected with a liquid inlet of an evaporator 7 through a main throttling device 6, and an air outlet of the evaporator 7 is connected with an air suction port of the compressor 1 through a stop valve 14-1 to form the main refrigerant circulation loop. In the main refrigerant circulation loop, waste heat resources associated in various industrial production processes are preferably used as heat sources of the evaporator 7, and the condenser 3 is connected with the high-temperature water demand side.
The second path is a motor cooling circulation loop, a main refrigerant outlet of the booster 5 is connected with an inlet of the cooler 8 through a stop valve 14-8, and an outlet of the cooler 8 is connected with a motor shell liquid inlet of the compressor 1 through an electromagnetic valve 13-1 and a throttle valve 9-1 in sequence; the motor shell outlet of the compressor 1 comprises a liquid outlet and an air outlet, two ejectors 10-1 and 10-2 are arranged in parallel, wherein an ejected medium inlet of the ejectors 10-1 is connected with the liquid outlet of the motor shell, an ejected source inlet of the ejectors 10-1 is connected with an air outlet of the compressor 1 through an electromagnetic valve 13-6 and a stop valve 14-5, an ejected medium inlet of the ejectors 10-2 is connected with the air outlet of the motor shell, an ejected source inlet of the ejectors 10-2 is connected with the air outlet of the compressor 1 through an electromagnetic valve 13-5 and a stop valve 14-5, and outlets of the ejectors 10-1 and 10-2 are connected with an inlet of the evaporator 7; the above forms the motor cooling circulation loop. The cooler 8 may be water-cooled or air-cooled to ensure cooling effect in the case of insufficient or no water.
The practical operation of the unit shows that the heating water outlet range of the condenser 3 can reach 130-170 ℃. The two ejectors can be controlled respectively, and when the heating water is at a lower temperature in the water outlet range, the ejector 10-1 which is connected with the liquid outlet of the motor shell can only operate, so that the cooling requirement of the motor coil can be met; when the heating water is at a higher temperature in the water outlet range, the electromagnetic valve 13-5 in front of the ejector 10-2 connected with the air outlet of the motor casing is opened, one air outlet is increased, the two ejectors operate simultaneously, the pressure in the motor casing is reduced, and the cooling effect of the motor coil and the stable and reliable operation of the motor are ensured.
The third path is an oil cooling circulation loop, a main refrigerant outlet of the booster 5 is connected with a liquid inlet of an oil cooler 11 through a stop valve 14-6, an electromagnetic valve 13-4 and a throttle valve 9-2, and an air outlet of the oil cooler 11 is connected with an air suction port of the compressor 1; the oil inlet of the oil cooler 11 is connected with the oil outlet of the oil separator 2 through the oil circulation pump 15 and the stop valve 14-9, the oil outlet of the oil cooler 11 is divided into two paths after passing through the dry filter 4-2, one path is connected with the main oil inlet of the compressor 1 (the main oil inlet is mainly used for bearing lubrication) through the electromagnetic valve 13-2 and the stop valve 14-2 in sequence, and the other path is connected with the screw oil injection port of the compressor 1 (used for lubricating screws) through the electromagnetic valve 13-3 and the stop valve 14-3 in sequence, so that an oil cooling circulation loop is formed.
The viscosity of the lubricating oil is high at low temperature when the unit is started, an oil circulating pump 15 is arranged in the oil cooling circulating loop, and the oil circulating pump 15 can ensure the stability of the unit starting; the dry filter 4-2 is provided with an oil differential pressure switch 12, and when the dry filter 4-2 is blocked, the alarm can be given and the stop protection can be carried out, so that the damage of the compressor caused by the continuous operation of the compressor 1 under the condition of oil shortage can be avoided.
The fourth path is a refrigerant synergistic loop, the main refrigerant outlet of the booster 5 is connected with the auxiliary refrigerant inlet of the booster 5 through the electromagnetic valve 13-7 and the throttle valve 9-3 in sequence, and the auxiliary refrigerant outlet of the booster 5 is connected with the medium-pressure inlet of the compressor 1 through the stop valve 14-10 to form the refrigerant synergistic loop.
The booster 5 not only increases the supercooling degree of the main refrigerant, reduces the temperature of the refrigerant entering the motor shell, realizes the cooling of the motor coil, but also recovers part of heat and improves the energy efficiency of the unit; the booster 5 sends low-temperature refrigerant medium-pressure gas into the compressor 1 through the compressor medium-pressure inlet, so that the exhaust gas temperature of the compressor 1 is reduced while the exhaust gas quantity and the heating quantity are increased, and the pyrolysis of lubricating oil is avoided.
As shown in fig. 1, the main throttle device 6 preferably adopts a main throttle valve group, wherein the main throttle valve group comprises two or more parallel combined valve units, each combined valve unit comprises a solenoid valve and a throttle valve which are connected in series, and the throttle valve is a manual adjusting valve. In a specific embodiment, the main throttle valve group adopts three parallel combined valve units, the opening degrees of the three throttle valves are respectively set to be 2/3,1/6 and 1/9, the electromagnetic valves are closed during shutdown, the electromagnetic valve corresponding to the 2/3 opening degree regulating valve is firstly opened after startup, then the opening and closing of other electromagnetic valves are controlled according to the suction superheat degree, and the stable and reliable operation of the unit is ensured. Of course, the combined valve units are not limited to three, and the number of the combined valve units can be increased or decreased according to the unit requirements. A preprogrammed electronic throttle valve may also be used as the main throttle device.
Wherein, reboiler at the bottom of the fractionating tower of petroleum refining industry can directly be used as condenser 3, and the raw material liquid of fractional distillation is directly heated by reboiler, thereby omitting the circulating energy consumption of middle water, avoiding secondary heat exchange, increasing heat transfer temperature difference and improving energy efficiency of the unit.
The foregoing is illustrative of the preferred embodiments of the present invention, and all parts not described in detail are common general knowledge of a person skilled in the art, and the present invention is defined by the claims, and any equivalent transformation based on the technical teaching of the present invention is within the scope of the present invention.
Claims (10)
1. Industrial ultra-temperature heat pump unit, its characterized in that, heat pump unit includes: the device comprises a compressor, a condenser, a booster, a main throttling device and an evaporator;
the compressor, the condenser, the booster, the main throttling device and the evaporator are connected to form a main refrigerant circulation loop; in the main refrigerant circulation loop, a liquid outlet of the condenser is connected with a main refrigerant inlet of the booster, and a main refrigerant outlet of the booster is connected with the main throttling device;
the heat pump unit is provided with a motor cooling circulation loop, a cooler is arranged in the motor cooling circulation loop, a main refrigerant outlet of the booster is connected with an inlet of the cooler, and an outlet of the cooler is connected with a liquid inlet of a motor shell of the compressor.
2. The industrial ultra-high temperature heat pump unit according to claim 1, wherein an ejector is further arranged in the motor cooling circulation loop, an ejected medium inlet of the ejector is connected with a motor casing outlet of the compressor, an ejecting source inlet of the ejector is connected with an exhaust port of the compressor, and an outlet of the ejector is connected with an inlet of the evaporator.
3. The industrial ultra-high temperature heat pump assembly of claim 2, wherein the motor housing outlet comprises a liquid outlet and an air outlet; the two ejectors are connected in parallel, wherein one ejected medium inlet of the ejectors is connected with a liquid outlet of the motor casing, and the other ejected medium inlet of the ejectors is connected with a gas outlet of the motor casing.
4. The industrial ultra-high temperature heat pump assembly according to claim 1, wherein an oil separator is provided in the main refrigerant circulation circuit, an air inlet of the oil separator is connected to an air outlet of the compressor, and an air outlet of the oil separator is connected to an air inlet of the condenser;
the heat pump unit is provided with an oil cooling circulation loop, an oil cooler is arranged in the oil cooling circulation loop, a main refrigerant outlet of the booster is connected with a liquid inlet of the oil cooler, and an air outlet of the oil cooler is connected with an air suction port of the compressor; an oil inlet of the oil cooler is connected with an oil outlet of the oil separator, and an oil outlet of the oil cooler is connected with an oil inlet of the compressor.
5. The industrial ultra-high temperature heat pump assembly of claim 4, wherein an oil circulation pump is provided in an oil path connecting an oil inlet of the oil cooler with an oil outlet of the oil separator.
6. The industrial ultra-high temperature heat pump unit according to claim 4, wherein a dry filter is arranged in an oil path in which an oil outlet of the oil cooler is connected with an oil inlet of the compressor, and the dry filter is connected in parallel with an oil differential pressure switch.
7. The industrial ultra-high temperature heat pump assembly of claim 6, wherein two oil paths are connected in parallel between the drying filter and the compressor, one oil path is connected with a main oil inlet of the compressor, and the other oil path is connected with a screw oil injection port of the compressor.
8. Industrial ultra-high temperature heat pump assembly according to any one of claims 1 to 7, wherein the primary refrigerant outlet of the booster is connected to the secondary refrigerant inlet of the booster, and the secondary refrigerant outlet of the booster is connected to the medium pressure inlet of the compressor, forming a refrigerant booster circuit.
9. The industrial ultra-high temperature heat pump assembly of claim 1, wherein the primary throttle device is a primary throttle valve assembly comprising two or more parallel combined valve units, each comprising a solenoid valve and a throttle valve in series.
10. The industrial ultra-high temperature heat pump assembly of claim 1, wherein the condenser comprises a reboiler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710553395.1A CN107246749B (en) | 2017-07-08 | 2017-07-08 | Industrial ultra-temperature heat pump unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710553395.1A CN107246749B (en) | 2017-07-08 | 2017-07-08 | Industrial ultra-temperature heat pump unit |
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| CN107246749A CN107246749A (en) | 2017-10-13 |
| CN107246749B true CN107246749B (en) | 2023-06-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112944733B (en) * | 2019-12-10 | 2024-08-09 | 珠海格力电器股份有限公司 | Compressor system and air conditioning unit |
| CN114425172A (en) * | 2022-02-25 | 2022-05-03 | 朱丹 | Rectification energy-saving complete equipment of supergravity coupling heat pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419031A (en) * | 2011-11-24 | 2012-04-18 | 上海环球制冷设备有限公司 | Ultra-high temperature heat pump device and use method thereof |
| CN205279502U (en) * | 2015-12-17 | 2016-06-01 | 天津柯瑞斯空调设备有限公司 | High temperature water source heat pump unit |
| DE202017100039U1 (en) * | 2017-01-06 | 2017-03-14 | Shanghai Ocean University | Jet self-cascade refrigeration system for residual heat recovery of a tuna fishing boat |
| CN206973938U (en) * | 2017-07-08 | 2018-02-06 | 山东宏力热泵能源股份有限公司 | Industrial superhigh temperature source pump |
-
2017
- 2017-07-08 CN CN201710553395.1A patent/CN107246749B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419031A (en) * | 2011-11-24 | 2012-04-18 | 上海环球制冷设备有限公司 | Ultra-high temperature heat pump device and use method thereof |
| CN205279502U (en) * | 2015-12-17 | 2016-06-01 | 天津柯瑞斯空调设备有限公司 | High temperature water source heat pump unit |
| DE202017100039U1 (en) * | 2017-01-06 | 2017-03-14 | Shanghai Ocean University | Jet self-cascade refrigeration system for residual heat recovery of a tuna fishing boat |
| CN206973938U (en) * | 2017-07-08 | 2018-02-06 | 山东宏力热泵能源股份有限公司 | Industrial superhigh temperature source pump |
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