CN117906189A - High-temperature steam heat pump system and control method - Google Patents
High-temperature steam heat pump system and control method Download PDFInfo
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- CN117906189A CN117906189A CN202410162659.0A CN202410162659A CN117906189A CN 117906189 A CN117906189 A CN 117906189A CN 202410162659 A CN202410162659 A CN 202410162659A CN 117906189 A CN117906189 A CN 117906189A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000002918 waste heat Substances 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 22
- 238000009826 distribution Methods 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 230000001276 controlling effect Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000001514 detection method Methods 0.000 claims description 15
- 230000004044 response Effects 0.000 claims description 6
- 239000002440 industrial waste Substances 0.000 abstract description 4
- 230000006837 decompression Effects 0.000 abstract 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 14
- 230000009467 reduction Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000006872 improvement Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 239000013589 supplement Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Abstract
The application provides a high-temperature steam heat pump system and a control method, which belong to the field of waste heat utilization, wherein the high-temperature steam heat pump system comprises a first steam supply pipeline, a second steam supply pipeline and a branch cylinder, the first steam supply pipeline comprises a low-pressure steam unit connected with a waste heat pipeline and a pressurizing steam unit connected with the low-pressure steam unit, and the pressurizing steam unit is configured to pressurize steam of the low-pressure steam unit; the second steam supply pipeline comprises a main branch cylinder, the main branch cylinder is connected with the steam main pipe through a steam decompression component, and the steam decompression component is configured to decompress steam of the steam main pipe; the branch gas distribution cylinder is connected with the user end pipeline, and the first gas supply pipeline and the second gas supply pipeline are connected to the branch gas distribution cylinder in parallel, wherein the first gas supply pipeline and the second gas supply pipeline are respectively provided with a switch component for regulating and controlling the on-off state of the first gas supply pipeline and the second gas supply pipeline. The high-temperature steam heat pump system provided by the application can switch the steam conveying pipeline according to the requirements of end users, thereby fully utilizing industrial waste heat and reducing energy consumption.
Description
Technical Field
The invention relates to the technical field of steam heat pumps, in particular to a high-temperature steam heat pump system and a control method.
Background
The high-temperature steam heat pump is used for extracting waste heat of middle and low temperatures discharged and wasted by industrial enterprises to prepare high-temperature steam of 120-180 ℃ through the waste heat, can be used in industrial processes, replaces a traditional steam boiler, and achieves the effects of energy conservation, carbon reduction, consumption reduction and efficiency improvement.
At present, a high-temperature steam heat pump has a small amount of application, but a commercialized mature high-temperature steam heat pump system is not completely replaced by a traditional steam boiler in the actual application process; meanwhile, the high-temperature steam heat pump system applied in the prior art is only applied as distributed steam supply, and the generated steam cannot be integrated into the original user side pipe network.
Disclosure of Invention
In view of the above, the present invention aims to provide a high-temperature steam heat pump system and a control method thereof, so as to solve the problem that the high-temperature steam heat pump and the main steam pipe network in the prior art cannot be used in a grid connection mode.
Based on the above object, the present invention provides a high temperature steam heat pump system comprising:
A first steam supply line comprising a low pressure steam unit connected to the waste heat line, and a boost steam unit connected to the low pressure steam unit, the boost steam unit configured to boost the steam of the low pressure steam unit;
a second steam supply line including a main sub cylinder connected to a steam header through a steam depressurizing means configured to depressurize steam of the steam header;
The branch gas distribution cylinder is connected with the user end pipeline, the first gas supply pipeline and the second gas supply pipeline are respectively connected with the branch gas distribution cylinder, and the first gas supply pipeline and the second gas supply pipeline are respectively provided with a switch component for regulating and controlling the on-off state.
Further, the low-pressure steam unit comprises a high-temperature heat pump connected with a waste heat pipeline, and the outlet end of the high-temperature heat pump is connected with a flash evaporator;
The pressurizing steam unit comprises a steam compressor connected with the outlet end of the flash evaporator, and an adjusting part for adjusting the exhaust pressure is connected to a pipeline where the steam compressor is located.
Further, the first steam supply pipeline further comprises a water supplementing unit, the water supplementing unit comprises a water source and a driving pump connected with the water source, and the water supplementing unit is connected with a flash evaporator of the low-pressure steam unit so as to supplement water to the flash evaporator through the driving pump.
Further, the pressurizing steam unit is connected with the branch air dividing cylinder through a first on-off switch, the main air dividing cylinder is connected with the branch air dividing cylinder through a second on-off switch, and the first on-off switch and the second on-off switch are electromagnetic valves.
Further, the first steam supply pipeline, the second steam supply pipeline and the branch air dividing cylinder are all provided with detection components, and the detection components are configured to detect pressure and temperature values of the first steam supply pipeline, the second steam supply pipeline and the branch air dividing cylinder.
Further, the detection component comprises a temperature sensor arranged at the outlet end of the flash evaporator, and the temperature sensor is configured to detect the temperature of a conveying pipeline of the low-pressure steam unit;
the high temperature heat pump is configured to maintain a delivery line temperature of the low pressure steam unit in a preset temperature interval.
Further, the detection component comprises a second pressure sensor arranged on a pipeline where the vapor compressor is located, and the second pressure sensor is configured to detect the pressure of a conveying pipeline of the pressurized vapor unit;
The vapor compressor is configured to place the delivery line pressure of the pressurized vapor unit in a first preset pressure interval to enable the first vapor supply line to supply vapor to the customer line.
Further, the main branch cylinder is connected with the steam main pipe through a third on-off switch, the branch cylinder is connected with the user end pipeline through a fourth on-off switch, and the opening of the fourth on-off switch is adjustable.
Further, the detection component includes a fifth pressure sensor disposed between the split cylinder and the customer premise line, the fifth pressure sensor configured to detect a delivery line pressure of the customer premise line;
The vapor compressor is configured to place the delivery line pressure of the customer premise line in a second preset pressure interval such that the delivery line pressure of the first vapor supply line is adapted to the line pressure of the customer premise line.
Based on the same inventive concept, the application also provides a high-temperature steam heat pump control method, which is suitable for the high-temperature steam heat pump system described in any one of the above, and comprises the following steps:
the method comprises the steps of obtaining a pressure value of a pressurizing steam unit on a first steam supply pipeline and obtaining a pressure value of the branch cylinder;
In response to determining that the value of the pressure value of the pressurizing steam unit exceeds the pressure value of the branch steam cylinder by more than a first preset threshold value, a first on-off switch is turned on to enable the first steam supply pipeline to be communicated with the branch steam cylinder, and a second on-off switch is turned off to enable the second steam supply pipeline to be disconnected from the branch steam cylinder;
And in response to determining that the value of the pressure value of the branch steam cylinder is lower than the value of the demand pressure value of the user-side pipeline and is larger than a second preset threshold, closing a first on-off switch to disconnect the first steam supply pipeline from the branch steam cylinder, and opening a second on-off switch to connect the second steam supply pipeline to the branch steam cylinder.
From the above, it can be seen that, in the high-temperature steam heat pump system provided by the invention, the first steam supply pipeline is utilized to receive the waste heat steam of the waste heat pipeline, the waste heat steam is pressurized and then can be combined into the branching air-separating cylinder for use by a user end, the second steam supply pipeline is utilized to decompress the main steam generated by the steam main pipe and then is combined into the branching air-separating cylinder for use by the user end, and because the first steam supply pipeline and the second steam supply pipeline are connected in parallel to the branching air-separating cylinder, the first steam supply pipeline and the second steam supply pipeline are respectively provided with a switch component for regulating the on-off state of the first steam supply pipeline and the second steam supply pipeline, the on-off state of the switch component can be switched, so that the first steam supply pipeline or the second steam supply pipeline can be regulated for supplying steam to the user end pipeline, the industrial waste heat can be fully utilized on the premise of ensuring the requirement of the user end, and the effects of energy saving, carbon reduction, consumption reduction and efficiency improvement can be realized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an overall schematic diagram of a high temperature steam heat pump in an embodiment of the invention.
Description of the reference numerals
10. A low pressure steam unit; 101. a high temperature heat pump; 102. a hot water circulation pump; 103. a flash evaporator; 104. a liquid level gauge; 105. a first pressure sensor; 106. a first temperature sensor; 107. a steam inlet valve;
20. a water replenishing unit; 201. a water source; 202. driving a pump; 203. a first check valve;
30. A pressurized steam unit; 301. a vapor compressor; 302. a second check valve; 303. a steam exhaust electromagnetic valve; 304. a second pressure sensor; 305. a second temperature sensor; 306. a flow meter; 307. a first on-off switch; 308. a third check valve;
4. A second steam supply pipeline; 401. a steam pressure reducing member; 402. a third on-off switch; 403. a third pressure sensor; 404. a third temperature sensor; 405. a main split cylinder; 407. a second on-off switch; 408. a fourth check valve;
409. A fourth pressure sensor; 410. a fourth temperature sensor; 411. branching cylinder; 412. a fourth on-off switch; 413. a fifth pressure sensor; 414. and a fifth temperature sensor.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The high-temperature steam heat pump is used for extracting waste heat of middle and low temperatures discharged and wasted by industrial enterprises to prepare high-temperature steam of 120-180 ℃ by waste heat, and can replace a traditional steam boiler in industrial process, thereby realizing the effects of energy conservation, carbon reduction, consumption reduction and efficiency improvement.
At present, a high-temperature steam heat pump has a small amount of application, but the commercialized mature high-temperature steam heat pump system is not fully replaced by a traditional steam boiler in the actual application process, and meanwhile, the high-temperature steam heat pump system applied in the prior art is only used as distributed steam supply application, and the generated steam cannot be combined into an original pipe network for standby.
Because the high-temperature steam heat pump system is influenced by the temperature change of the waste heat end in the waste heat pipeline, the steam yield fluctuates, the use of users is influenced, and the traditional steam boiler cannot be completely replaced. Therefore, the steam generated by the high-temperature steam heat pump system is only used as a steam supplement for users, manual switching is needed when the steam is switched with main steam, and the risk of high-pressure steam and low-pressure steam strings exists.
Based on the above related art, one or more embodiments of the present application provide a high temperature steam heat pump system, which is described below with reference to the accompanying drawings.
As shown in fig. 1, the high-temperature steam heat pump system according to the present application includes a first steam supply pipeline, a second steam supply pipeline 4 and a branching air separation cylinder 411.
Wherein the first steam supply pipeline comprises a low-pressure steam unit 10 connected with the waste heat pipeline and a pressurizing steam unit 30 connected with the low-pressure steam unit 10, and the pressurizing steam unit 30 is configured to pressurize steam of the low-pressure steam unit 10; the second steam supply line 4 comprises a main sub-cylinder 405, the main sub-cylinder 405 being connected to a steam header by a steam pressure reducing component 401, the steam pressure reducing component 401 being configured to reduce the steam of the steam header; the branching air distribution cylinder 411 is connected with a user end pipeline, the first steam supply pipeline and the second steam supply pipeline 4 are respectively connected with the branching air distribution cylinder 411, and the first steam supply pipeline and the second steam supply pipeline 4 are respectively provided with a switch component for regulating and controlling the on-off state of the first steam supply pipeline and the second steam supply pipeline.
As can be seen from the above description, in the high-temperature steam heat pump system according to the present application, the first steam supply pipeline is utilized to receive the waste heat water of the waste heat pipeline, the waste heat water is converted into steam after being pressurized, and then the steam is merged into the branching air-separating cylinder 411 for use by the user end, and the main steam generated by the main steam pipe is decompressed by the second steam supply pipeline 4 and then merged into the branching air-separating cylinder 411 for use by the user end, because the first steam supply pipeline and the second steam supply pipeline 4 are connected in parallel to the branching air-separating cylinder 411, the first steam supply pipeline and the second steam supply pipeline 4 are respectively provided with a switch component for regulating the on-off state thereof, and the on-off state of the switch component is switched, so that the first steam supply pipeline or the second steam supply pipeline 4 can be regulated for supplying steam to the user end pipeline, thereby being beneficial to fully utilizing industrial waste heat and realizing the effects of energy saving, carbon reduction and consumption reduction and efficiency improvement on the premise of ensuring the heat supply requirement of the user end.
In the above embodiment, the waste heat pipe refers to a pipe for transporting industrial waste heat, and the steam header refers to a pipe for intensively transporting steam generated by a plurality of steam boilers to respective heat consuming devices through pipes in a large industrial production site or a heating station or the like, where the steam header is used for transporting heat of the steam boilers. In fig. 1, a user end is connected with a user end pipeline, and a waste heat inlet is connected with a waste heat pipeline.
The boost steam unit and the branching sub-cylinder 411 are connected by the first on-off switch 307, and the main sub-cylinder 405 and the branching sub-cylinder 411 are connected by the second on-off switch 407. The first on-off switch 307 and the second on-off switch 407 adopt solenoid valves, and switch the on-off state by external control. In general, the first on-off switch 307 and the second on-off switch 407 may be in an on-state or an off-state at the same time, and when the first on-off switch 307 and the second on-off switch 407 are in the on-state at the same time, the waste heat pipe and the steam main supply heat to the user side pipe at the same time.
In some embodiments, the low pressure steam unit 10 comprises a high temperature heat pump 101 connected with a waste heat pipe, and a flash evaporator 103 is connected to the outlet end of the high temperature heat pump 101.
In the above embodiment, the high-temperature heat pump 101 converts the heat in the waste water and waste steam of middle and low temperature discharged and wasted by the industrial enterprises into high-temperature hot water with the temperature less than or equal to 150 ℃ through the high-temperature heat pump, when the high-temperature hot water is generated by the high-temperature heat pump, the flash evaporation entering the flash evaporator 103 becomes low-pressure steam, the low-pressure steam enters the steam compressor 301, and the high-pressure steam meeting the pipeline requirement of the user side is formed by compression of the steam compressor 301.
In the above embodiment, the first steam supply pipe further includes a water replenishing unit 20, where the water replenishing unit 20 includes a water source 201 and a driving pump 202 connected to the water source 201, and the water replenishing unit 20 is connected to the flash evaporator 103 of the low pressure steam unit 10, so as to replenish water to the flash evaporator 103 through the driving pump 202. In this example, the driving pump 202 may employ the hot water circulation pump 102 of the related art, and the water source 201 is a tank storing softened water. In addition, in order to avoid the backflow of the water liquid in the flash evaporator 103, a first check valve 203 is further provided between the flash evaporator 103 and the driving pump 202, and a hot water circulating pump 102 for driving the water liquid to flow is further provided between the flash evaporator 103 and the high temperature heat pump 101.
As shown in fig. 1, in some embodiments, the flash evaporator 103 is further provided with a liquid level gauge 104, and the liquid level gauge 104 is used for detecting the liquid level inside the flash evaporator 103 so as to ensure the normal working state of the flash evaporator 103. Here, the working state of the water replenishing unit 20 may be set with reference to the liquid level value of the liquid level gauge 104, and when the liquid level height in the flash evaporator 103 reaches the preset liquid level, the pump 202 is driven to perform the frequency-reducing operation; when the liquid level in the flash evaporator 103 is lower than the preset liquid level, the pump 202 is driven to perform the frequency-raising operation, so that the liquid level in the flash evaporator 103 is maintained at the preset liquid level.
In some embodiments, the pressurizing steam unit includes a steam compressor 301 connected to the outlet end of the flash evaporator 103, and an adjusting component for adjusting the exhaust pressure is connected to a pipeline where the steam compressor 301 is located.
In the above embodiment, the adjusting means includes the steam discharge solenoid valve 303 connected to the steam compressor 301, the steam discharge solenoid valve 303 communicates with the outside, and the steam discharge pressure of the steam compressor 301 is adjusted by adjusting the rotation speed of the steam compressor 301. In addition, a steam inlet valve 107 is further provided in the inlet direction of the vapor compressor 301, a flow meter 306 is further provided in the outlet direction of the vapor compressor 301, and the flow meter 306 is used for detecting the flow rate of the output steam of the vapor compressor 301. In addition, a second check valve 302 is further provided between the vapor compressor 301 and the discharge solenoid valve 303, and a third check valve 308 is further provided between the first on-off switch 307 and the branching sub-cylinder 411, the second check valve 302 and the second check valve 302 allowing the vapor to flow unidirectionally toward the branching sub-cylinder 411.
In some embodiments, when the vapor compressor 301 in the booster vapor unit stops operating, the first solenoid valve is closed synchronously, the vapor discharge solenoid valve 303 is opened, and the vapor discharge solenoid valve 303 is closed after discharging vapor for a certain period of time, so as to prevent the vapor compressor 301 from being damaged due to the reverse rotation of the vapor compressor 301.
In some embodiments, the main gas dividing cylinder 405 is connected to the steam main pipe through a third on-off switch 402, the branch gas dividing cylinder 411 is connected to the user side pipeline through a fourth on-off switch 412, and the opening of the fourth on-off switch 412 is adjustable.
Here, the third on-off switch 402 and the fourth on-off switch 412 use manual valves, and the fourth on-off switch 412 adjusts the valve opening by rotating the valves, and adjusts the discharge pressure of the vapor compressor 301 by adjusting the valve opening.
As shown in fig. 1, in some embodiments, the first steam supply line, the second steam supply line 4, and the branching sub-cylinder 411 are each provided with a detection means configured to detect pressure and temperature values of the first steam supply line, the second steam supply line 4, and the branching sub-cylinder 411.
Illustratively, the detecting component includes a first temperature sensor 106 disposed at an outlet end of the flash evaporator 103, the first temperature sensor 106 being configured to detect a delivery line temperature of the low pressure steam unit 10; the high temperature heat pump 101 is configured to maintain the delivery line temperature of the low pressure steam unit 10 in a preset temperature interval. When the temperature of the conveying pipeline detected by the first temperature sensor 106 is lower than a preset temperature range, the power of the high-temperature heat pump 101 is increased to enable the high-temperature heat pump 101 to load and operate, and when the temperature of the conveying pipeline detected by the first temperature sensor 106 is higher than the preset temperature range, the power of the high-temperature heat pump 101 is reduced to enable the high-temperature heat pump 101 to unload and operate.
Here, the preset temperature interval may be determined according to the actual conveying scenario and the required temperature of the user side pipeline, as can also be seen from fig. 1, the temperature detected by the first temperature sensor 106 is the steam temperature after the flash evaporation of the flash evaporator 103, and the steam temperature is less than or equal to the steam temperature of the user side pipeline, so that the preset temperature interval should be comprehensively set in consideration of factors such as the pipeline protection conveying loss, the pipeline conveying speed, and the like.
In some embodiments, a second temperature sensor 305 is further disposed between the vapor compressor 301 and the split cylinder 411, a third temperature sensor 404 is disposed on the main split cylinder 405, a fourth temperature sensor 410 is disposed on the split cylinder 411, and a fifth temperature sensor 414 is disposed between the customer premise pipeline and the split cylinder 411, and by disposing temperature sensors at different components and different positions, respectively, the real-time pipeline temperature of the high-temperature vapor heat pump system can be monitored more accurately, thereby facilitating grid connection regulation and control.
In some embodiments, a first pressure sensor 105 is further disposed at the outlet end of the flash evaporator 103, where the first pressure sensor 105 is configured to detect a line pressure of a line in which the low pressure steam unit 10 is located. In some embodiments, the detecting component includes a second pressure sensor 304 disposed on a pipeline where the vapor compressor 301 is disposed, the second pressure sensor 304 is configured to detect a delivery pipeline pressure of the pressurized vapor unit, the detecting component further includes a third pressure sensor 403 disposed on the main split cylinder 405 and a fourth pressure sensor 409 disposed on the split cylinder 411, and the vapor compressor 301 is configured to maintain the delivery pipeline pressure of the pressurized vapor unit in a first preset pressure interval.
In an exemplary embodiment, in an initial state, the steam header transmits steam to the user side pipeline through the main branch cylinder 405 and the branch cylinder 411, the set first preset pressure interval is p=1.1p 4-1.2P4(P4 and is the pressure value of the fourth pressure sensor 409, when the exhaust pressure of the steam compressor 301 detected by the second pressure sensor 304 is lower than the first preset pressure interval, the steam compressor 301 increases the power loading operation, and when the exhaust pressure of the steam compressor 301 detected by the second pressure sensor 304 is higher than the first preset pressure interval, the steam compressor 301 decreases the power load shedding operation. Here, it is sufficient that the delivery line pressure of the pressurized steam unit is greater than the pressure of the branching cylinder 411.
When the pressure value of the second pressure sensor 304 of the pressurizing steam unit is 1.1 times greater than the pressure of the fourth pressure sensor 409 of the split sub-cylinder 411, the grid-connected condition is satisfied, steam in the waste heat pipeline can enter the split sub-cylinder 411, at the moment, the second on-off switch 407 is closed, the first on-off switch 307 is opened, at the moment, steam in the main sub-cylinder 405 stops entering the split sub-cylinder 411, and the steam is switched to the waste heat pipeline to supply steam. In the foregoing process, when the discharge pressure of the vapor compressor 301 is within the first preset pressure interval, the control is performed by controlling the rotation speed of the vapor compressor 301 or controlling the load-reducing power of the vapor compressor 301.
In the above embodiment, the detecting means further includes a fifth pressure sensor 413 disposed between the branching cylinder 411 and the client line, the fifth pressure sensor 413 being configured to detect a delivery line pressure of the client line; the vapor compressor 301 is configured to place the delivery line pressure of the customer premise pipeline in a second preset pressure interval, so that the delivery line pressure of the first vapor supply pipeline is adapted to the line pressure of the customer premise pipeline, which can avoid high energy and low usage of vapor, thereby being beneficial to improving the overall heat pump system efficiency.
For example, after the steam is switched to the waste heat pipeline to supply the steam by using the waste heat, considering the demand pressure of the user side pipeline and the pressure mismatch of the delivery pipeline of the pressurized steam unit, the delivery pipeline pressure of the steam compressor 301 is adjusted according to the opening degree of the fourth on-off switch 412 and the pressure value of the fifth pressure sensor 413, at this time, the preset pressure interval of the steam compressor 301 is modified to a second preset pressure interval M, and according to the model m=1.1nΦ 2P5～1.2nφ2P5, where n is a correction coefficient related to the pipeline pressure loss, the pipeline diameter, etc., Φ is the opening degree of the fourth on-off switch 412, and P 5 is the pressure value of the fifth pressure sensor 413. Here, when the discharge pressure of the vapor compressor 301 is in the second preset pressure interval, the opening degree of the fourth on-off switch 412 is adjusted.
In the process of switching to the waste heat pipeline for supplying steam by using waste heat, when the pressure value of the fourth pressure sensor 409 of the split cylinder 411 is 1.1 times lower than the minimum required pressure of the user side pipeline (namely, the pressure value of the fifth pressure sensor 413), the first on-off switch 307 is closed, the second on-off switch 407 is opened, the exhaust pressure target value range of the steam compressor 301 is adjusted to a first preset pressure range, and at the moment, steam in the waste heat pipeline stops entering the split cylinder 411 and is switched to the main split cylinder 405 for supplying steam. The foregoing process of adjusting the loading power of the vapor compressor 301 is repeated.
Here, in the above process, the steam header and the waste heat pipe simultaneously supply steam to the customer side pipe are in a state.
The steam of the main steam pipe is decompressed by the steam decompressing component 401 and enters the main sub-cylinder 405, when the pressure value of the third pressure sensor 403 in the main sub-cylinder 405 is lower than that of the fourth pressure sensor 409, the normal steam supply to the user side pipeline cannot be ensured, so that the second on-off switch 407 cannot be directly switched to be in a channel state, at this time, the steam decompressing component 401 is adjusted until the pressure in the main sub-cylinder 405 is higher than that of the fourth pressure sensor 409 in the sub-cylinder 411, and the second on-off switch 407 is switched on to supply steam to the user side pipeline. Here, a fourth check valve 408 is further provided between the main sub cylinder 405 and the sub cylinder 411, and the fourth check valve 408 allows the steam to flow unidirectionally toward the sub cylinder 411.
In some embodiments, a control module is further provided in the high-temperature steam heat pump system, and the control module can collect detection data of the detection component and regulate and control different working states of the high-temperature steam heat pump system according to the detection data. Here, the control module, after collecting the temperature information of the first temperature sensor 106, regulates and controls the working power of the high-temperature heat pump 101, so that the high-temperature heat pump 101 is loaded or unloaded; after the control module collects the pressure information of each pressure sensor, the control module controls the first steam supply pipeline to be integrated into the user side pipeline for steam supply when the grid-connected condition is met, or controls the first on-off switch 307 of the first steam supply pipeline to be disconnected when the grid-connected condition is not met, so that the first steam supply pipeline is disconnected from the user side pipeline.
When the high-temperature heat pump 101 of the first steam supply pipeline is fully loaded for a certain time, the temperature value detected by the first temperature sensor 106 of the flash evaporator 103 still cannot reach the preset temperature interval, and it is proved that the waste heat pipeline cannot reach the grid-connected condition when the waste heat is utilized at the moment, steam cannot be supplied to the user side pipeline, at the moment, the operation of the high-temperature heat pump 101 needs to be stopped, and abnormal information is reported to the control module or the cloud monitoring platform. In this example, the control module is a PLC control chip.
According to the high-temperature steam heat pump system, in the system operation process, the high-temperature steam heat pump system is combined with the actual steam demand of the end user side pipeline to reasonably adjust the steam supply temperature, so that the operation of the high-temperature steam heat pump system can be automatically adjusted, the influence of fluctuation of the output of the high-temperature steam heat pump system on a user is effectively reduced, the steam produced by the high-temperature steam heat pump is automatically integrated into an original steam pipe network, and the original steam supply system and the high-temperature steam heat pump system can be automatically switched and mutually complemented.
Based on the same inventive concept, the application also provides a high-temperature steam heat pump control method, which is suitable for the high-temperature steam heat pump system described in any one of the above, and comprises the following steps:
The pressure value of the pressurizing steam unit on the first steam supply pipeline is obtained, and the pressure value of the branch air dividing cylinder 411 is obtained.
In response to determining that the value of the pressure of the pressurized steam unit exceeds the value of the pressure of the split sub-cylinder 411 by more than a first preset threshold, the first on-off switch 307 is turned on to connect the first steam supply line to the split sub-cylinder 411, and the second on-off switch 407 is turned off to disconnect the second steam supply line 4 from the split sub-cylinder 411.
In response to determining that the value of the pressure value of the split sub-cylinder 411 is lower than the value of the demand pressure value of the customer premise pipeline by more than a second preset threshold, the first on-off switch 307 is turned off to disconnect the first steam supply pipeline from the split sub-cylinder 411, and the second on-off switch 407 is turned on to connect the second steam supply pipeline 4 to the split sub-cylinder 411.
In the above method, a control module is provided in the high temperature steam heat pump system, and the control module regulates and controls the on/off states of the first on/off switch 307 and the second on/off switch 407 by collecting the detection data of the detection component. In addition, the first preset threshold and the second preset threshold may be set with reference to the actual operation situation of the high temperature steam heat pump, and by way of example, the pressure value of the pressurizing steam unit may be determined by the second pressure sensor 304, the pressure value of the split cylinder 411 may be determined by the fourth pressure sensor 409, the first preset threshold is 1.1 times the pressure value of the fourth pressure sensor 409, and the second preset threshold is 1.1 times the pressure value of the demand pressure of the user side pipeline, that is, 1.1 times the pressure value of the fifth pressure sensor, which is not absolutely limited in the present application.
Since the control method of the high-temperature steam heat pump according to the present application is applicable to the high-temperature steam heat pump system according to any of the foregoing embodiments, the control method can refer to the relevant description of the high-temperature steam heat pump system and has all the advantages of the high-temperature steam heat pump system.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (10)
1. A high temperature steam heat pump system, comprising:
A first steam supply line comprising a low pressure steam unit connected to the waste heat line, and a boost steam unit connected to the low pressure steam unit, the boost steam unit configured to boost the steam of the low pressure steam unit;
a second steam supply line including a main sub cylinder connected to a steam header through a steam depressurizing means configured to depressurize steam of the steam header;
The branch gas distribution cylinder is connected with the user end pipeline, the first gas supply pipeline and the second gas supply pipeline are respectively connected with the branch gas distribution cylinder, and the first gas supply pipeline and the second gas supply pipeline are respectively provided with a switch component for regulating and controlling the on-off state.
2. The high temperature steam heat pump system of claim 1, wherein the low pressure steam unit comprises a high temperature heat pump connected with a waste heat pipe, and a flash evaporator is connected to an outlet end of the high temperature heat pump;
The pressurizing steam unit comprises a steam compressor connected with the outlet end of the flash evaporator, and an adjusting part for adjusting the exhaust pressure is connected to a pipeline where the steam compressor is located.
3. The high temperature steam heat pump system of claim 2 wherein the first steam supply line further comprises a water replenishment unit comprising a water source and a drive pump connected to the water source, the water replenishment unit being connected to a flash evaporator of the low pressure steam unit to replenish water to the flash evaporator by the drive pump.
4. The high temperature steam heat pump system of claim 2 wherein the boost steam unit and the split sub-cylinder are connected by a first on-off switch, the main sub-cylinder and the split sub-cylinder are connected by a second on-off switch, and the first on-off switch and the second on-off switch are solenoid valves.
5. The high temperature steam heat pump system according to any one of claims 2 to 4, wherein the first steam supply line, the second steam supply line, and the branching cylinder are each provided with a detection means configured to detect pressure and temperature values of the first steam supply line, the second steam supply line, and the branching cylinder.
6. The high temperature vapor heat pump system of claim 5, wherein the detection component comprises a temperature sensor disposed at the flash evaporator outlet end, the temperature sensor configured to detect a transfer line temperature of the low pressure vapor unit;
the high temperature heat pump is configured to maintain a delivery line temperature of the low pressure steam unit at a preset temperature interval.
7. The high temperature vapor heat pump system of claim 5, wherein the detection component comprises a second pressure sensor disposed on a line in which the vapor compressor is located, the second pressure sensor configured to detect a delivery line pressure of the pressurized vapor unit;
The vapor compressor is configured to place the delivery line pressure of the pressurized vapor unit in a first preset pressure interval to enable the first vapor supply line to supply vapor to the customer line.
8. The high temperature steam heat pump system of claim 5 wherein the main branch cylinder is connected to the steam header via a third on-off switch, the branch cylinder is connected to the customer side pipeline via a fourth on-off switch, and the fourth on-off switch is adjustable in opening.
9. The high temperature steam heat pump system of claim 8, wherein the detection component comprises a fifth pressure sensor disposed between the split cylinder and the customer premise piping, the fifth pressure sensor configured to detect a delivery piping pressure of the customer premise piping;
The vapor compressor is configured to place the delivery line pressure of the customer premise line in a second preset pressure interval such that the delivery line pressure of the first vapor supply line is adapted to the line pressure of the customer premise line.
10. A high temperature steam heat pump control method, suitable for use in a high temperature steam heat pump system according to any one of claims 1 to 9, the method comprising:
the method comprises the steps of obtaining a pressure value of a pressurizing steam unit on a first steam supply pipeline and obtaining a pressure value of the branch cylinder;
In response to determining that the value of the pressure value of the pressurizing steam unit exceeds the pressure value of the branch steam cylinder by more than a first preset threshold value, a first on-off switch is turned on to enable the first steam supply pipeline to be communicated with the branch steam cylinder, and a second on-off switch is turned off to enable the second steam supply pipeline to be disconnected from the branch steam cylinder;
And in response to determining that the value of the pressure value of the branch steam cylinder is lower than the value of the demand pressure value of the user-side pipeline and is larger than a second preset threshold, closing a first on-off switch to disconnect the first steam supply pipeline from the branch steam cylinder, and opening a second on-off switch to connect the second steam supply pipeline to the branch steam cylinder.
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| CN202410162659.0A CN117906189A (en) | 2024-02-05 | 2024-02-05 | High-temperature steam heat pump system and control method |
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| CN202410162659.0A CN117906189A (en) | 2024-02-05 | 2024-02-05 | High-temperature steam heat pump system and control method |
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