CN117716186A - Industrial boiler heating system and control method and control device thereof - Google Patents
Industrial boiler heating system and control method and control device thereof Download PDFInfo
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- CN117716186A CN117716186A CN202180100818.9A CN202180100818A CN117716186A CN 117716186 A CN117716186 A CN 117716186A CN 202180100818 A CN202180100818 A CN 202180100818A CN 117716186 A CN117716186 A CN 117716186A
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- 238000000034 method Methods 0.000 title claims abstract description 86
- 238000010438 heat treatment Methods 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003507 refrigerant Substances 0.000 claims description 60
- 230000008569 process Effects 0.000 claims description 58
- 239000007788 liquid Substances 0.000 claims description 27
- 238000007906 compression Methods 0.000 claims description 15
- 238000001704 evaporation Methods 0.000 claims description 15
- 230000008020 evaporation Effects 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 5
- 239000000779 smoke Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 23
- 238000010586 diagram Methods 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 238000009833 condensation Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000003245 coal Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
-
- 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
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The embodiment of the invention discloses an industrial boiler heating system, and a control method and a control device thereof. The system comprises: an industrial boiler; a steam turbine; a first heat exchanger; a high temperature heat pump; wherein the high-temperature heat pump is coaxially connected with the steam turbine; the outlet of the industrial boiler is connected with the inlet of the steam turbine; the outlet of the steam turbine is connected with the hot inlet of the first heat exchanger; the heat outlet of the first heat exchanger is connected with the inlet of the industrial boiler; a cold inlet of the first heat exchanger is connected with a hot outlet of an evaporator in the high-temperature heat pump; the cold outlet of the first heat exchanger is connected with the hot inlet of an evaporator in the high-temperature heat pump; the high temperature heat pump is adapted to provide water at greater than or equal to 80 degrees celsius. According to the embodiment of the invention, the outlet exhaust steam after the steam turbine does work is used as a heat source of the evaporator in the high-temperature heat pump, so that the energy is saved, and the working efficiency of the high-temperature heat pump is improved.
Description
The invention relates to the technical field of industrial boilers, in particular to an industrial boiler heating system, a control method and a control device thereof.
Industrial boilers are classified into hot water boilers and steam boilers according to the use, steel industrial boilers, condensing industrial boilers and vacuum boilers according to the product performance, and the like. Industrial boilers are widely applied to the fields of chemical industry, food, paper making, urban heat supply and the like, mainly take fossil fuel (such as coal, natural gas and the like) as a main material, directly produce low-pressure steam or hot water through combustion for heat supply users, or produce electricity through cogeneration, and simultaneously provide low-pressure steam or hot water through a steam extraction turbine or a back pressure turbine.
At present, energy waste is caused by lack of good utilization of outlet exhaust steam after the steam turbine works.
Disclosure of Invention
The embodiment of the invention provides an industrial boiler heating system, a control method and a control device thereof.
An industrial boiler heating system, comprising:
an industrial boiler;
a steam turbine;
a first heat exchanger;
a high temperature heat pump;
wherein the high temperature heat pump is coaxially connected with the steam turbine; the outlet of the industrial boiler is connected with the inlet of the steam turbine; the outlet of the steam turbine is connected with the hot inlet of the first heat exchanger; the heat outlet of the first heat exchanger is connected with the inlet of the industrial boiler; the cold outlet of the first heat exchanger is connected with the hot inlet of an evaporator in the high-temperature heat pump; the high temperature heat pump is adapted to provide water at greater than or equal to 80 degrees celsius.
Therefore, the embodiment of the invention takes the outlet exhaust steam after the steam turbine works as the heat source of the evaporator in the high-temperature heat pump, thereby saving energy and improving the working efficiency of the high-temperature heat pump.
In one embodiment, the cold inlet of the first heat exchanger is connected to the hot outlet of an evaporator in the high temperature heat pump.
It can be seen that the evaporator in the high temperature heat pump is directly connected to the cold inlet of the first heat exchanger, with a simple connection structure.
In one embodiment, the high temperature heat pump further comprises: a compressor; a condenser; a throttle.
Therefore, the high-temperature heat pump is utilized to provide water or high-temperature steam with higher temperature, and the high-temperature heat pump can be used for industrial processes or heating. In particular, the high-temperature low-pressure refrigerant is used for replacing the traditional coal in the high-temperature heat pump, so that the industrial energy conservation, consumption reduction and efficiency improvement can be realized.
In one embodiment, the method further comprises:
and the first low-level heat source is connected with a heat inlet of an evaporator in the high-temperature heat pump.
Therefore, the low-level heat source is collected to the high-temperature heat pump, and the low-level heat source can be well utilized.
In one embodiment, the method further comprises:
a second heat exchanger;
a third heat exchanger;
a second low level heat source;
wherein the heat inlet of the second heat exchanger is connected with the smoke outlet of the industrial boiler; the heat outlet of the second heat exchanger is connected with a chimney; the cold inlet of the second heat exchanger is connected with the hot outlet of the third heat exchanger; the cold outlet of the second heat exchanger is connected with the hot inlet of the evaporator in the high-temperature heat pump; the heat inlet of the third heat exchanger is connected with a second low-level heat source; a cold inlet of the third heat exchanger is connected with a hot outlet of an evaporator in the high-temperature heat pump; the cold outlet of the third heat exchanger is connected with the cold inlet of the first heat exchanger.
Therefore, by utilizing the heat of the flue gas, the loss of flue gas can be reduced. And further, the low-level heat source is collected to the high-temperature heat pump, so that the low-level heat source can be further well utilized.
An industrial boiler heating system, comprising:
an industrial boiler;
a steam turbine;
a first heat exchanger;
a fourth heat exchanger;
a high temperature heat pump;
wherein the high temperature heat pump is coaxially connected with the steam turbine; the outlet of the industrial boiler is connected with the inlet of the steam turbine; the outlet of the steam turbine is connected with the hot inlet of the first heat exchanger; the hot outlet of the first heat exchanger is connected with the cold inlet of the fourth heat exchanger; a cold inlet of the first heat exchanger is connected with a hot outlet of an evaporator in the high-temperature heat pump; the cold outlet of the first heat exchanger is connected with the hot inlet of an evaporator in the high-temperature heat pump; the cold outlet of the fourth heat exchanger is connected with the inlet of the industrial boiler; the heat inlet of the fourth heat exchanger is connected with the steam extraction port of the steam turbine; the heat outlet of the fourth heat exchanger is connected with the heat inlet of the first heat exchanger; the high temperature heat pump is adapted to provide water at greater than or equal to 80 degrees celsius.
Therefore, the embodiment of the invention takes the outlet exhaust steam after the steam turbine works as the heat source of the evaporator in the high-temperature heat pump, thereby saving energy and improving the working efficiency of the high-temperature heat pump. In particular, the steam extracted through the steam extraction port of the steam turbine is heated by backwater of the industrial boiler, so that the back pressure of the driving steam turbine can be reduced, the steam turbine does more work, and the part of chemical energy converted into high-quality mechanical work is higher.
In one embodiment, the high temperature heat pump further comprises: a compressor; a condenser; a throttle.
Therefore, the high-temperature heat pump is utilized to provide water or high-temperature steam with higher temperature, and the high-temperature heat pump can be used for industrial processes or heating. In particular, the high-temperature low-pressure refrigerant is used for replacing the traditional coal in the high-temperature heat pump, so that the industrial energy conservation, consumption reduction and efficiency improvement can be realized.
In one embodiment, the method further comprises:
and the first low-level heat source is connected with a heat inlet of an evaporator in the high-temperature heat pump.
Therefore, the low-level heat source is further collected to the high-temperature heat pump, and the low-level heat source can be well utilized.
In one embodiment, the method further comprises:
a second heat exchanger;
a third heat exchanger;
a second low level heat source;
wherein the heat inlet of the second heat exchanger is connected with the smoke outlet of the industrial boiler; the heat outlet of the second heat exchanger is connected with a chimney; the cold inlet of the second heat exchanger is connected with the hot outlet of the third heat exchanger; the cold outlet of the second heat exchanger is connected with the hot inlet of the evaporator in the high-temperature heat pump; the heat inlet of the third heat exchanger is connected with a second low-level heat source; a cold inlet of the third heat exchanger is connected with a hot outlet of an evaporator in the high-temperature heat pump; the cold outlet of the third heat exchanger is connected with the cold inlet of the first heat exchanger.
Therefore, by utilizing the heat of the flue gas, the loss of flue gas can be reduced. And further, the low-level heat source is collected to the high-temperature heat pump, so that the low-level heat source can be further well utilized.
A method of controlling an industrial boiler heating system as claimed in any one of the preceding claims, the method comprising:
connecting an inlet of a condenser in the high-temperature heat pump with a water outlet pipeline of a heat load;
and connecting an outlet of a condenser in the high-temperature heat pump with a return water pipeline of the heat load.
Therefore, the embodiment of the invention takes the outlet exhaust steam after the steam turbine works as the heat source of the evaporator in the high-temperature heat pump, and the high-temperature heat pump can supply heat for the heat load, thereby saving energy and improving the working efficiency of the high-temperature heat pump.
In one embodiment, the method further comprises:
controlling the high temperature heat pump to perform high temperature heat pump processing to output heat to the thermal load;
wherein the high temperature heat pump process comprises:
a compression process including compressing a low temperature low pressure refrigerant gas into a high temperature high pressure refrigerant gas;
a condensing process including condensing the high-temperature and high-pressure refrigerant gas generated in the compressing process into a medium-temperature and high-pressure refrigerant liquid;
a throttling process including converting the refrigerant liquid of high pressure and medium temperature generated by the condensing process into a refrigerant liquid of low pressure and low temperature;
and the evaporation process comprises the step of evaporating the low-temperature low-pressure refrigerant liquid generated in the throttling process into low-temperature low-pressure refrigerant gas.
Therefore, the high-temperature heat pump is utilized to provide water or high-temperature steam with higher temperature, and the high-temperature heat pump can be used for industrial processes or heating. In particular, the high-temperature low-pressure refrigerant is used for replacing the traditional coal in the high-temperature heat pump, so that the industrial energy conservation, consumption reduction and efficiency improvement can be realized.
A control device of an industrial boiler heating system comprises a processor and a memory;
the memory has stored therein an application executable by the processor for causing the processor) to perform the control method of the industrial boiler heating system as set forth in any one of the above.
A computer readable storage medium having stored therein computer readable instructions for performing the control method of the industrial boiler heating system as set forth in any one of the above.
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
fig. 1 is a first exemplary structural diagram of an industrial boiler heating system according to an embodiment of the present invention.
Fig. 2 is a second exemplary block diagram of an industrial boiler heating system according to an embodiment of the present invention.
Fig. 3 is a third exemplary block diagram of an industrial boiler heating system according to an embodiment of the present invention.
Fig. 4 is a flowchart of a control method of an industrial boiler heating system according to an embodiment of the present invention.
Fig. 5 is a block diagram of a control device of an industrial boiler heating system having a processor-memory architecture according to an embodiment of the present invention.
Wherein, the reference numerals are as follows:
| reference numerals | Meaning of |
| 11 | Industrial boiler |
| 12 | Steam turbine |
| 13 | First heat exchanger |
| 14 | High temperature heat pump |
| 141 | Compression device |
| 142 | Condenser |
| 143 | Throttle device |
| 144 | Evaporator |
| 15 | Second heat exchanger |
| 16 | Third heat exchanger |
| 17 | Second low-level heat source |
| 18 | Fourth heat exchanger |
| 19 | First low-level heat source |
| 20 | Thermal load |
| 400 | Control method of industrial boiler heating system |
| 401～403 | Step (a) |
| 500 | Control device of industrial boiler heating system |
| 501 | Processor and method for controlling the same |
| 502 | Memory device |
The present invention will be further described in detail with reference to the following examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
For simplicity and clarity of description, the following description sets forth aspects of the invention by describing several exemplary embodiments. Numerous details in the embodiments are provided solely to aid in the understanding of the invention. It will be apparent, however, that the embodiments of the invention may be practiced without limitation to these specific details. Some embodiments are not described in detail in order to avoid unnecessarily obscuring aspects of the present invention, but rather only to present a framework. Hereinafter, "comprising" means "including but not limited to", "according to … …" means "according to at least … …, but not limited to only … …". The term "a" or "an" is used herein to refer to a number of components, either one or more, or at least one, unless otherwise specified.
In consideration of the defect that the outlet exhaust steam after the steam turbine does work is lack of effective utilization in the prior art, the embodiment of the invention takes the outlet exhaust steam after the steam turbine does work as a heat source of an evaporator in the high-temperature heat pump, thereby saving energy and improving the working efficiency of the high-temperature heat pump.
Fig. 1 is a first exemplary structural diagram of an industrial boiler heating system according to an embodiment of the present invention.
In fig. 1, an industrial boiler heating system includes: an industrial boiler 11; a steam turbine 12; a first heat exchanger 13; a high temperature heat pump 14.
In general, a high-temperature heat pump is a heat pump capable of heating water at a temperature of 80 degrees celsius (c) or more, and a heat pump capable of heating water at a temperature of 65 degrees celsius is generally called a medium-temperature heat pump or a medium-high-temperature heat pump. The high temperature heat pump 14 has a coaxial connection (indicated by a double solid line in fig. 1) with the steam turbine 12. The outlet of the industrial boiler 11 is connected to the inlet of a steam turbine 12. The outlet of the turbine 12 is connected to the hot inlet of the first heat exchanger 13. The heat outlet of the first heat exchanger 13 is connected to the inlet of the industrial boiler 11. The cold inlet of the first heat exchanger 13 is connected to the hot outlet of the evaporator 144 in the high temperature heat pump 14. The cold outlet of the first heat exchanger 13 is connected to the hot inlet of the evaporator 144 in the high temperature heat pump 14. The industrial boiler 11 is preferably implemented as a steam boiler.
The steam turbine 12 is also called a steam turbine engine, and is a rotary steam power device, and high-temperature and high-pressure steam provided by the industrial boiler 11 passes through a fixed nozzle to become accelerated airflow and then is sprayed onto blades, so that a rotor provided with a blade row rotates and simultaneously performs work to the outside.
The steam output from the outlet of the industrial boiler 11 is input to the inlet of the steam turbine 12 to drive the steam turbine 12 to do work. After the steam turbine 12 performs work, the steam discharged from the outlet of the steam turbine 12 after the work enters the hot inlet of the first heat exchanger 13, is cooled, and flows back to the inlet of the industrial boiler 11. Meanwhile, the working medium flowing out from the heat outlet of the evaporator 144 in the high-temperature heat pump 14 absorbs heat through the first heat exchanger 13 and then flows back to the heat inlet of the evaporator 144 in the high-temperature heat pump 14.
The high-temperature heat pump 14 can collect heat in waste water and waste gas with medium and low temperature discharged and wasted by industrial enterprises through the high-temperature heat pump 14 for industrial process or heating use. The high temperature heat pump may provide heat to the thermal load 20. For example, water or high temperature steam at 80-150 ℃ is provided for the thermal load 20.
In addition to the evaporator 144, the high temperature heat pump 14 includes: a compressor 141; a condenser 142; a throttle 143.
The moving shaft of the steam turbine 12 is connected to the moving shaft of a compressor (or referred to as a compressor) 141 in the high-temperature heat pump 14 through a coupling. Thus, the rotational movement of the turbine 12 may drive the rotational movement of the compressor 141, thereby driving the operation of the high temperature heat pump 14.
Specifically, the operation of the high temperature heat pump 14 includes: (1) compression process; (2) a condensation process; (3) a throttling process; (4) an evaporation process.
The compressor 141 performs a compression process. In the compression process, the refrigerant gas of low temperature and low pressure is compressed into a gas of high temperature and high pressure by the compressor 141. At this time, work performed by the compressor 141 is converted into internal energy of the refrigerant gas, and the temperature and pressure are increased, which is thermodynamically called an adiabatic process.
The condenser 142 performs a condensing process. During the condensation process: the high-temperature and high-pressure refrigerant gas from the compressor 141 flows through the condenser 142, and is continuously discharged to the outside by wind or water to be condensed into a medium-temperature and high-pressure refrigerant liquid. The temperature of the refrigerant decreases but the pressure is constant during liquefaction, and is thermodynamically called an isobaric process.
The throttle 143 performs a throttle process. During the throttling process: the medium-temperature high-pressure refrigerant liquid from the condenser 142 is throttled by the throttle 143 to become a low-temperature low-pressure refrigerant liquid. Thermodynamically, is called isenthalpic process.
The evaporator 144 performs an evaporation process. During evaporation: the low temperature and low pressure refrigerant liquid exiting the restrictor 143 flows through the evaporator 144. The evaporator 144 absorbs heat through the first heat exchanger 13 through the heat inlet, and evaporates the low-temperature low-pressure refrigerant liquid into a low-temperature low-pressure refrigerant gas. The absorbed heat becomes latent heat of the refrigerant, and the internal energy increases considerably although the temperature increases little. Since the pressure does not change much, it is thermodynamically called an isobaric process.
Therefore, the outlet exhaust steam after the steam turbine 12 works is used as a heat source of the evaporator 144 in the high-temperature heat pump 14, so that energy sources are saved, and the working efficiency of the high-temperature heat pump 14 is improved.
In one embodiment, the system may further comprise: the first low-level heat source 19 is connected to a heat inlet of an evaporator 144 in the high-temperature heat pump 14. Therefore, the first low-level heat source 19 can also be used as a heat source of an evaporator in the high-temperature heat pump, thereby further improving the working efficiency of the high-temperature heat pump and making good use of the low-level heat source. The first low level heat source 19 may be implemented as solar energy, rock energy, industrial waste heat, etc.
The system design of the boiler steam driven compression heat pump based on the high-temperature heat pump technology can be widely applied to various industries, and replaces the scenes of supplying various low-temperature heat energy such as low-pressure steam and the like through direct combustion of the boiler in the industry with efficiency of more than 100%. Fossil energy is changed into high-temperature heat energy, so that the steam turbine is driven to do work, and the fossil energy is not directly changed into heat energy of low-pressure steam, so that better energy cascade utilization is realized. Low-temperature heat sources below 80 degrees are many, for example low-temperature heat placed into the environment during various air cooling processes, often difficult to utilize, and high-temperature heat pumps that produce heat energy up to 150 degrees are clearly more valuable than low-temperature heat pumps that produce heat energy up to 80 degrees.
Fig. 2 is a second exemplary block diagram of an industrial boiler heating system according to an embodiment of the present invention.
In fig. 2, the industrial boiler heating system comprises: an industrial boiler 11; a steam turbine 12; a first heat exchanger 13; a high temperature heat pump 14.
The high temperature heat pump 14 has a coaxial connection (indicated by a double solid line in fig. 2) with the steam turbine 12. The outlet of the industrial boiler 11 is connected to the inlet of a steam turbine 12. The outlet of the turbine 12 is connected to the hot inlet of the first heat exchanger 13. The heat outlet of the first heat exchanger 13 is connected to the inlet of the industrial boiler 11. The cold inlet of the first heat exchanger 13 is connected to the hot outlet of the evaporator 144 in the high temperature heat pump 14. The cold outlet of the first heat exchanger 13 is connected to the hot inlet of the evaporator 144 in the high temperature heat pump 14. The industrial boiler 11 is preferably implemented as a steam boiler. The high temperature heat pump 14 is adapted to provide water or steam at a temperature greater than or equal to 80 degrees celsius.
The industrial boiler heating system comprises: a second heat exchanger 15; a third heat exchanger 16; a second low-level heat source 17; wherein the heat inlet of the second heat exchanger 15 is connected with the flue of the industrial boiler 11; the heat outlet of the second heat exchanger 15 is connected with a chimney; the cold inlet of the second heat exchanger 15 is connected with the hot outlet of the third heat exchanger 16; the cold outlet of the second heat exchanger 15 is connected to the hot inlet of the evaporator 144 in the high temperature heat pump 14; the heat inlet of the third heat exchanger 16 is connected with a second low-level heat source 17; the cold inlet of the third heat exchanger 16 is connected to the hot outlet of the evaporator 144 in the high temperature heat pump 14; the cold outlet of the third heat exchanger 16 is connected to the cold inlet of the first heat exchanger 13.
The steam turbine 12 is also called a steam turbine engine, and is a rotary steam power device, and high-temperature and high-pressure steam provided by the industrial boiler 11 passes through a fixed nozzle to become accelerated airflow and then is sprayed onto blades, so that a rotor provided with a blade row rotates and simultaneously performs work to the outside.
The steam output from the outlet of the industrial boiler 11 is input to the inlet of the steam turbine 12 to drive the steam turbine 12 to do work. After the steam turbine 12 performs work, the steam discharged from the outlet of the steam turbine 12 after the work enters the hot inlet of the first heat exchanger 13, is cooled, and flows back to the inlet of the industrial boiler 11.
The heat energy provided by the second low-level heat source 17 is supplied via the third heat exchanger 16 to the working medium flowing out of the heat outlet of the evaporator 144 in the high-temperature heat pump 14. After absorbing heat by the third heat exchanger 16, a part of the working fluid flows into the cold inlet of the first heat exchanger 13. This part of the working medium, after absorbing heat again by the first heat exchanger 13, flows back to the heat inlet of the evaporator 144 in the high-temperature heat pump 14. The flue gas energy of the flue gas outlet of the industrial boiler 11 is supplied via the second heat exchanger 15 to the remaining working medium flowing out of the heat outlet of the third heat exchanger 16. The remaining working fluid absorbs heat by the second heat exchanger 15 and flows back to the heat inlet of the evaporator 144 in the high temperature heat pump 14.
The high-temperature heat pump 14 can collect heat in waste water and waste gas with medium and low temperature discharged and wasted by industrial enterprises through the high-temperature heat pump 14 for industrial process or heating use. The high temperature heat pump may provide heat to the thermal load 20. For example, water or high temperature steam at 80-150 ℃ is provided for the thermal load 20.
In addition to the evaporator 144, the high temperature heat pump 14 includes: a compressor 141; a condenser 142; a throttle 143. The moving shaft of the steam turbine 12 is connected to the moving shaft of a compressor (or referred to as a compressor) 141 in the high-temperature heat pump 14 through a coupling. Thus, the rotational movement of the turbine 12 may drive the rotational movement of the compressor 141, thereby driving the operation of the high temperature heat pump 14.
Specifically, the operation of the high temperature heat pump 14 includes: (1) compression process; (2) a condensation process; (3) a throttling process; (4) an evaporation process.
The compressor 141 performs a compression process. In the compression process, the refrigerant gas of low temperature and low pressure is compressed into a gas of high temperature and high pressure by the compressor 141. At this time, work performed by the compressor 141 is converted into internal energy of the refrigerant gas, and the temperature and pressure are increased, which is thermodynamically called an adiabatic process.
The condenser 142 performs a condensing process. During the condensation process: the high-temperature and high-pressure refrigerant gas from the compressor 141 flows through the condenser 142, and is continuously discharged to the outside by wind or water to be condensed into a medium-temperature and high-pressure refrigerant liquid. The temperature of the refrigerant decreases but the pressure is constant during liquefaction, and is thermodynamically called an isobaric process.
The throttle 143 performs a throttle process. During the throttling process: the medium-temperature high-pressure refrigerant liquid from the condenser 142 is throttled by the throttle 143 to become a low-temperature low-pressure refrigerant liquid. Thermodynamically, is called isenthalpic process.
The evaporator 144 performs an evaporation process. During evaporation: the low temperature and low pressure refrigerant liquid exiting the restrictor 143 flows through the evaporator 144. The evaporator 144 absorbs heat from the first heat exchanger 13, the second heat exchanger 15, and the third heat exchanger 16 via the heat inlet, evaporating the low-temperature low-pressure refrigerant liquid into a low-temperature low-pressure refrigerant gas. The absorbed heat becomes latent heat of the refrigerant, and the internal energy increases considerably although the temperature increases little. Since the pressure does not change much, it is thermodynamically called an isobaric process.
In one embodiment, similar to the system shown in fig. 1, the system further comprises: a first low level heat source (not shown in fig. 2) is connected to the heat inlet of the evaporator 144 in the high temperature heat pump 14. Therefore, the first low-level heat source can also be used as a heat source of an evaporator in the high-temperature heat pump, so that the working efficiency of the high-temperature heat pump is further improved.
Fig. 3 is a third exemplary block diagram of an industrial boiler heating system according to an embodiment of the present invention.
As shown in fig. 3, the industrial boiler heating system includes: an industrial boiler 11; a steam turbine 12; a first heat exchanger 13; a fourth heat exchanger 18; a high temperature heat pump 14.
The high temperature heat pump 14 has a coaxial connection (indicated by a double solid line in fig. 3) with the steam turbine 12. The outlet of the industrial boiler 11 is connected to the inlet of a steam turbine 12. The outlet of the turbine 12 is connected to the hot inlet of the first heat exchanger 13. The hot outlet of the first heat exchanger 13 is connected to the cold inlet of the fourth heat exchanger 18. The cold inlet of the first heat exchanger 13 is connected to the hot outlet of the evaporator 144 in the high temperature heat pump 14. The cold outlet of the first heat exchanger 13 is connected to the hot inlet of the evaporator 144 in the high temperature heat pump 14. The cold outlet of the fourth heat exchanger 18 is connected with the inlet of the industrial boiler 11; the hot inlet of the fourth heat exchanger 18 is connected to the steam extraction port of the steam turbine 12. The heat outlet of the fourth heat exchanger 18 is connected to the heat inlet of the first heat exchanger 13.
The steam turbine 12 is also called a steam turbine engine, and is a rotary steam power device, and high-temperature and high-pressure steam provided by the industrial boiler 11 passes through a fixed nozzle to become accelerated airflow and then is sprayed onto blades, so that a rotor provided with a blade row rotates and simultaneously performs work to the outside. The steam output from the outlet of the industrial boiler 11 is input to the inlet of the steam turbine 12 to drive the steam turbine 12 to do work.
After the steam turbine 12 performs work, part of the steam which is pumped and discharged from the steam discharge port of the steam turbine 12 after the work enters the heat inlet of the fourth heat exchanger 18, is cooled, and flows to the heat inlet of the first heat exchanger 13. Meanwhile, the steam flowing out of the heat outlet of the first heat exchanger 13 absorbs heat through the fourth heat exchanger 18 and then flows back to the inlet of the industrial boiler 11. Therefore, a part of the residual steam after working is extracted to heat the water entering the industrial boiler 11, so that the temperature of the water entering the boiler can be raised.
After the steam turbine 12 performs work, the remaining steam (excluding part of the steam that is pumped and discharged through the steam outlet) discharged from the outlet of the steam turbine 12 enters the hot inlet of the first heat exchanger 13, is cooled, and flows to the cold inlet of the fourth heat exchanger 18. Meanwhile, the working medium flowing out from the heat outlet of the evaporator 144 in the high-temperature heat pump 14 absorbs heat through the first heat exchanger 13 and then flows back to the heat inlet of the evaporator 144 in the high-temperature heat pump 14.
The high-temperature heat pump 14 can collect heat in waste water and waste gas with medium and low temperature discharged and wasted by industrial enterprises through the high-temperature heat pump 14 for industrial process or heating use. The high temperature heat pump may provide heat to the thermal load 20. For example, water or high temperature steam at 80-150 ℃ is provided for the thermal load 20.
In addition to the evaporator 144, the high temperature heat pump 14 includes: a compressor 141; a condenser 142; a throttle 143.
Specifically, the operation of the high temperature heat pump 14 includes: (1) compression process; (2) a condensation process; (3) a throttling process; (4) an evaporation process.
The compressor 141 performs a compression process. In the compression process, the refrigerant gas of low temperature and low pressure is compressed into a gas of high temperature and high pressure by the compressor 141. At this time, work performed by the compressor 141 is converted into internal energy of the refrigerant gas, and the temperature and pressure are increased, which is thermodynamically called an adiabatic process.
The condenser 142 performs a condensing process. During the condensation process: the high-temperature and high-pressure refrigerant gas from the compressor 141 flows through the condenser 142, and is continuously discharged to the outside by wind or water to be condensed into a medium-temperature and high-pressure refrigerant liquid. The temperature of the refrigerant decreases but the pressure is constant during liquefaction, and is thermodynamically called an isobaric process.
The throttle 143 performs a throttle process. During the throttling process: the medium-temperature high-pressure refrigerant liquid from the condenser 142 is throttled by the throttle 143 to become a low-temperature low-pressure refrigerant liquid. Thermodynamically, is called isenthalpic process.
The evaporator 144 performs an evaporation process. During evaporation: the low temperature and low pressure refrigerant liquid exiting the restrictor 143 flows through the evaporator 144. The evaporator 144 absorbs heat from the first heat exchanger 13 via the heat inlet, and the low-temperature low-pressure refrigerant liquid evaporates into a low-temperature low-pressure refrigerant gas. The absorbed heat becomes latent heat of the refrigerant, and the internal energy increases considerably although the temperature increases little. Since the pressure does not change much, it is thermodynamically called an isobaric process.
In one embodiment, similar to the system shown in FIG. 1, the industrial boiler heating system may further comprise: a first low level heat source (not shown in fig. 3) is connected to the heat inlet of the evaporator 144 in the high temperature heat pump 14. Therefore, the first low-level heat source can also be used as a heat source of an evaporator in the high-temperature heat pump, so that the working efficiency of the high-temperature heat pump is further improved.
In one embodiment, similar to the system shown in FIG. 2, the industrial boiler heating system may further comprise: a second heat exchanger (not shown in fig. 3); a third heat exchanger (not shown in fig. 3); a second low level heat source (not shown in fig. 3); wherein the heat inlet of the second heat exchanger is connected with the smoke outlet of the industrial boiler 11; the heat outlet of the second heat exchanger is connected with a chimney; the cold inlet of the second heat exchanger is connected to the hot outlet of the third heat exchanger 16; the cold outlet of the second heat exchanger is connected to the hot inlet of the evaporator 144 in the high temperature heat pump 14; the heat inlet of the third heat exchanger is connected with a second low-level heat source; the cold inlet of the third heat exchanger is connected to the hot outlet of the evaporator 144 in the high temperature heat pump 14; the cold outlet of the third heat exchanger is connected to the cold inlet of the first heat exchanger 13. Therefore, by utilizing the heat of the flue gas, the loss of flue gas can be reduced. And further, the second low-level heat source is collected to the high-temperature heat pump, so that the low-level heat source can be further well utilized.
Based on the above description, a control method of an industrial boiler heating system is also proposed. Fig. 4 is a flowchart of a control method of an industrial boiler heating system according to an embodiment of the present invention. The method is suitable for any industrial boiler heating system.
As shown in fig. 4, the method 400 includes:
step 401: the inlet of the condenser in the high temperature heat pump 14 is connected to the outlet conduit of the heat load.
Step 402: the outlet of the condenser in the high temperature heat pump 14 is connected to the return line of the heat load.
In one embodiment, the method 400 further comprises: step 403: the high temperature heat pump 14 is controlled to perform a high temperature heat pump process to output heat to a heat load. Wherein the high temperature heat pump treatment comprises: the compression process comprises the following steps: compressing the low-temperature low-pressure refrigerant gas into a high-temperature high-pressure refrigerant gas; condensing: condensing the high-temperature and high-pressure refrigerant gas generated in the compression process into medium-temperature and high-pressure refrigerant liquid; the throttling process comprises the following steps: converting the medium-temperature high-pressure refrigerant liquid generated in the condensation process into low-temperature low-pressure refrigerant liquid; the evaporation process comprises the following steps: the low temperature and low pressure refrigerant liquid generated by the throttling process is evaporated into a low temperature and low pressure refrigerant gas.
The embodiment of the invention also provides a control device of the industrial boiler heating system with the processor-memory architecture. Fig. 5 is a block diagram of a control device of an industrial boiler heating system having a processor-memory architecture according to an embodiment of the present invention.
As shown in fig. 5, the control device 500 of the industrial boiler heating system comprises a processor 501, a memory 502 and a computer program stored on the memory 502 and executable on the processor 501, which when executed by the processor 501 implements the control method of the industrial boiler heating system as any one of the above.
The memory 502 may be implemented as a variety of storage media such as an electrically erasable programmable read-only memory (EEPROM), a Flash memory (Flash memory), a programmable read-only memory (PROM), and the like. The processor 501 may be implemented to include one or more central processors or one or more field programmable gate arrays, where the field programmable gate arrays integrate one or more central processor cores. In particular, the central processor or central processor core may be implemented as a CPU or MCU or DSP, etc.
It should be noted that not all the steps and modules in the above processes and the structure diagrams are necessary, and some steps or modules may be omitted according to actual needs. The execution sequence of the steps is not fixed and can be adjusted as required. The division of the modules is merely for convenience of description and the division of functions adopted in the embodiments, and in actual implementation, one module may be implemented by a plurality of modules, and functions of a plurality of modules may be implemented by the same module, and the modules may be located in the same device or different devices.
The hardware modules in the various embodiments may be implemented mechanically or electronically. For example, a hardware module may include specially designed permanent circuits or logic devices (e.g., special purpose processors such as FPGAs or ASICs) for performing certain operations. A hardware module may also include programmable logic devices or circuits (e.g., including a general purpose processor or other programmable processor) temporarily configured by software for performing particular operations. As regards implementation of the hardware modules in a mechanical manner, either by dedicated permanent circuits or by circuits that are temporarily configured (e.g. by software), this may be determined by cost and time considerations.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
- An industrial boiler heating system, comprising:an industrial boiler (11);a steam turbine (12);a first heat exchanger (13);a high temperature heat pump (14);wherein the high temperature heat pump (14) is coaxially connected to the steam turbine (12); the outlet of the industrial boiler (11) is connected with the inlet of the steam turbine (12); the outlet of the steam turbine (12) is connected with the hot inlet of the first heat exchanger (13); the heat outlet of the first heat exchanger (13) is connected with the inlet of the industrial boiler (11); a cold outlet of the first heat exchanger (13) is connected with a hot inlet of an evaporator (144) in the high-temperature heat pump (14); the high temperature heat pump (14) is adapted to provide water at greater than or equal to 80 degrees celsius.
- An industrial boiler heating system according to claim 1, wherein,the cold inlet of the first heat exchanger (13) is connected to the hot outlet of an evaporator (144) in the high temperature heat pump (14).
- An industrial boiler heating system according to claim 1, wherein the high temperature heat pump (14) further comprises:a compressor (141);a condenser (142);a throttle (143).
- An industrial boiler heating system according to claim 1, further comprising:and the first low-level heat source (19) is connected with a heat inlet of an evaporator (144) in the high-temperature heat pump (14).
- An industrial boiler heating system according to claim 1, further comprising:a second heat exchanger (15);a third heat exchanger (16);a second low-level heat source (17);wherein the hot inlet of the second heat exchanger (15) is connected with the smoke outlet of the industrial boiler (11); the heat outlet of the second heat exchanger (15) is connected with a chimney; the cold inlet of the second heat exchanger (15) is connected with the hot outlet of the third heat exchanger (16); the cold outlet of the second heat exchanger (15) is connected with the hot inlet of an evaporator (144) in the high-temperature heat pump (14); the heat inlet of the third heat exchanger (16) is connected with a second low-level heat source (17); a cold inlet of the third heat exchanger (16) is connected with a hot outlet of an evaporator (144) in the high-temperature heat pump (14); the cold outlet of the third heat exchanger (16) is connected with the cold inlet of the first heat exchanger (13).
- An industrial boiler heating system, comprising:an industrial boiler (11);a steam turbine (12);a first heat exchanger (13);a fourth heat exchanger (18);a high temperature heat pump (14);wherein the high temperature heat pump (14) is coaxially connected to the steam turbine (12); the outlet of the industrial boiler (11) is connected with the inlet of the steam turbine (12); the outlet of the steam turbine (12) is connected with the hot inlet of the first heat exchanger (13); the hot outlet of the first heat exchanger (13) is connected with the cold inlet of the fourth heat exchanger (18); a cold inlet of the first heat exchanger (13) is connected with a hot outlet of an evaporator (144) in the high-temperature heat pump (14); the cold outlet of the first heat exchanger (13) is connected with the hot inlet of an evaporator (144) in the high-temperature heat pump (14); the cold outlet of the fourth heat exchanger (18) is connected with the inlet of the industrial boiler (11); the hot inlet of the fourth heat exchanger (18) is connected with the steam extraction port of the steam turbine (12); the heat outlet of the fourth heat exchanger (18) is connected with the heat inlet of the first heat exchanger (13); the high temperature heat pump (14) is adapted to provide water at greater than or equal to 80 degrees celsius.
- An industrial boiler heating system according to claim 6, wherein the high temperature heat pump (14) further comprises:a compressor (141);a condenser (142);a throttle (143).
- An industrial boiler heating system according to claim 6, further comprising:and the first low-level heat source (19) is connected with a heat inlet of an evaporator (144) in the high-temperature heat pump (14).
- A heating system for an industrial boiler according to claim 6, further comprising:a second heat exchanger (15);a third heat exchanger (16);a second low-level heat source (17);wherein the hot inlet of the second heat exchanger (15) is connected with the smoke outlet of the industrial boiler (11); the heat outlet of the second heat exchanger (15) is connected with a chimney; the cold inlet of the second heat exchanger (15) is connected with the hot outlet of the third heat exchanger (16); the cold outlet of the second heat exchanger (15) is connected with the hot inlet of an evaporator (144) in the high-temperature heat pump (14); the heat inlet of the third heat exchanger (16) is connected with a second low-level heat source (17); a cold inlet of the third heat exchanger (16) is connected with a hot outlet of an evaporator (144) in the high-temperature heat pump (14); the cold outlet of the third heat exchanger (16) is connected with the cold inlet of the first heat exchanger (13).
- A control method (400) of an industrial boiler heating system according to any of claims 1-9, wherein the method (400) comprises:connecting (401) an inlet of a condenser in the high temperature heat pump (14) with an outlet conduit of a heat load;an outlet of a condenser in the high temperature heat pump (14) is connected (402) to a return line of a heat load.
- The control method (400) according to claim 10, further comprising:-controlling the high temperature heat pump (14) to perform a high temperature heat pump process to output heat (403) to the thermal load;wherein the high temperature heat pump process comprises:a compression process including compressing a low temperature low pressure refrigerant gas into a high temperature high pressure refrigerant gas;a condensing process including condensing the high-temperature and high-pressure refrigerant gas generated in the compressing process into a medium-temperature and high-pressure refrigerant liquid;a throttling process including converting the refrigerant liquid of high pressure and medium temperature generated by the condensing process into a refrigerant liquid of low pressure and low temperature;and the evaporation process comprises the step of evaporating the low-temperature low-pressure refrigerant liquid generated in the throttling process into low-temperature low-pressure refrigerant gas.
- A control device (500) of an industrial boiler heating system, characterized by comprising a processor (501) and a memory (502);the memory (502) has stored therein an application executable by the processor (501) for causing the processor (501) to execute the control method (400) of an industrial boiler heating system according to any one of claims 10 to 11.
- A computer readable storage medium, characterized in that computer readable instructions are stored therein for performing a control method (400) of an industrial boiler heating system according to any of claims 10-11.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2021/117221 WO2023035149A1 (en) | 2021-09-08 | 2021-09-08 | Industrial boiler heat supply system, and control method and control apparatus therefor |
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| JP2002089994A (en) * | 2000-09-19 | 2002-03-27 | Kawasaki Thermal Engineering Co Ltd | Absorption type water cooling and heating device utilizing waste heat |
| JP4554527B2 (en) * | 2006-01-31 | 2010-09-29 | 株式会社日立エンジニアリング・アンド・サービス | Energy-saving equipment using waste heat |
| CN101140116A (en) * | 2006-09-04 | 2008-03-12 | 葆光（大连）节能技术研究所有限公司 | Waste fume using and waste heat recovery type thermoelectric cold cogeneration technology |
| CN101865567A (en) * | 2010-04-30 | 2010-10-20 | 张军 | System for combined heat supply by using steam boiler and steam-driven water source heat pump |
| CN104235928A (en) * | 2013-06-13 | 2014-12-24 | 烟台龙源电力技术股份有限公司 | Boiler flue gas waste heat heating system |
| CN204987536U (en) * | 2015-06-09 | 2016-01-20 | 西安交通大学 | High temperature heating device based on lithium bromide absorption heat pump unit |
| CN209399346U (en) * | 2018-05-24 | 2019-09-17 | 国能科创节能技术（北京）有限公司 | Vapour for Mist heat recovering drags heat pump system |
| CN210832157U (en) * | 2019-11-11 | 2020-06-23 | 华电莱州发电有限公司 | Coal-fired unit heating system capable of recycling flue gas waste heat |
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