A high temperature steam heat pump system and control method

Abstract

This invention provides a high-temperature steam heat pump system and control method, belonging to the field of waste heat utilization. The high-temperature steam heat pump system includes a first steam supply pipeline, a second steam supply pipeline, and branch steam cylinders. The first steam supply pipeline includes a low-pressure steam unit connected to the waste heat pipeline and a booster steam unit connected to the low-pressure steam unit. The booster steam unit is configured to boost the steam from the low-pressure steam unit. The second steam supply pipeline includes a main steam cylinder, which is connected to a steam header through a steam pressure reducing component, configured to reduce the steam pressure in the steam header. The branch steam cylinders are connected to user-end pipelines. The first and second steam supply pipelines are connected in parallel to the branch steam cylinders. Each of the first and second steam supply pipelines is equipped with a switch component to regulate its on / off state. The high-temperature steam heat pump system provided by this application can switch the steam delivery pipeline according to the needs of the end user, thereby fully utilizing industrial waste heat and reducing energy consumption.

Description

Technical Field

[0001] This invention relates to the field of steam heat pump technology, and in particular to a high-temperature steam heat pump system and control method. Background Technology

[0002] High-temperature steam heat pumps extract low- to medium-temperature waste heat from industrial enterprises to produce high-temperature steam at 120°C to 180°C. These heat pumps can be used in industrial processes to replace traditional steam boilers, achieving energy saving, carbon reduction, and efficiency improvement.

[0003] Currently, high-temperature steam heat pumps have been used in a small number of applications, but there are few commercially available mature high-temperature steam heat pump systems. In practical applications, they cannot completely replace traditional steam boilers. At the same time, the existing high-temperature steam heat pump systems are only used as distributed steam supply applications and cannot integrate the generated steam into the original user-end pipeline network. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose a high-temperature steam heat pump system and control method to solve the problem that high-temperature steam heat pumps and main steam pipelines cannot be connected to the grid in the prior art.

[0005] To achieve the above objectives, the present invention provides a high-temperature steam heat pump system, comprising:

[0006] The first steam supply pipeline includes a low-pressure steam unit connected to a waste heat pipeline and a booster steam unit connected to the low-pressure steam unit, wherein the booster steam unit is configured to boost the steam of the low-pressure steam unit.

[0007] The second steam supply pipeline includes a main steam distribution cylinder, which is connected to the steam header via a steam pressure reducing component, which is configured to reduce the steam pressure in the steam header.

[0008] A branch steam cylinder is connected to the user-end pipeline. The first steam supply pipeline and the second steam supply pipeline are respectively connected to the branch steam cylinder. The first steam supply pipeline and the second steam supply pipeline are respectively equipped with a switch component for regulating the on / off state.

[0009] Furthermore, the low-pressure steam unit includes a high-temperature heat pump connected to a waste heat pipeline, and a flash evaporator is connected to the outlet end of the high-temperature heat pump.

[0010] The pressurized steam unit includes a steam compressor connected to the outlet end of the flash evaporator, and the pipeline containing the steam compressor is connected to a regulating component for adjusting the exhaust pressure.

[0011] Furthermore, the first steam supply pipeline also includes a water replenishment unit, which includes a water source and a drive pump connected to the water source. The water replenishment unit is connected to the flash evaporator of the low-pressure steam unit to replenish water to the flash evaporator through the drive pump.

[0012] Furthermore, the booster steam unit and the branch steam cylinder are connected by a first on / off switch, and the main steam cylinder and the branch steam cylinder are connected by a second on / off switch. The first on / off switch and the second on / off switch are solenoid valves.

[0013] Furthermore, the first steam supply line, the second steam supply line, and the branch steam cylinder are all equipped with detection components, which are configured to detect the pressure and temperature values ​​of the first steam supply line, the second steam supply line, and the branch steam cylinder.

[0014] Furthermore, the detection component includes a temperature sensor located at the outlet end of the flash evaporator, the temperature sensor being configured to detect the temperature of the delivery pipeline of the low-pressure steam unit;

[0015] The high-temperature heat pump is configured to maintain the temperature of the delivery pipeline of the low-pressure steam unit within a preset temperature range.

[0016] Furthermore, the detection component includes a second pressure sensor disposed on the pipeline where the steam compressor is located, the second pressure sensor being configured to detect the pressure of the delivery pipeline of the booster steam unit;

[0017] The steam compressor is configured to keep the pressure of the delivery pipeline of the booster steam unit within a first preset pressure range, so that the first steam supply pipeline can supply steam to the user-end pipeline.

[0018] Furthermore, the main steam cylinder and the steam header are connected by a third on / off switch, and the branch steam cylinder and the user-end pipeline are connected by a fourth on / off switch, the opening degree of which is adjustable.

[0019] Furthermore, the detection component includes a fifth pressure sensor disposed between the branch cylinder and the user-end pipeline, the fifth pressure sensor being configured to detect the delivery pipeline pressure of the user-end pipeline;

[0020] The steam compressor is configured to keep the pressure of the delivery pipeline of the user-end pipeline within a second preset pressure range, so that the pressure of the delivery pipeline of the first steam supply pipeline is adapted to the pressure of the pipeline of the user-end pipeline.

[0021] Based on the same inventive concept, this application also provides a high-temperature steam heat pump control method, applicable to any of the high-temperature steam heat pump systems described above, the method comprising:

[0022] Obtain the pressure value of the booster steam unit on the first steam supply pipeline, and obtain the pressure value of the branch steam cylinder;

[0023] In response to the determination that the pressure value of the booster steam unit exceeds the pressure value of the branch steam cylinder by a value greater than a first preset threshold, the first on / off switch is opened to connect the first steam supply line with the branch steam cylinder, and the second on / off switch is closed to disconnect the second steam supply line from the branch steam cylinder.

[0024] In response to the determination that the pressure value of the branch steam cylinder is lower than the required pressure value of the user-end pipeline but greater than a second preset threshold, the first on / off switch is closed to disconnect the first steam supply pipeline from the branch steam cylinder, and the second on / off switch is opened to connect the second steam supply pipeline to the branch steam cylinder.

[0025] As can be seen from the above, the high-temperature steam heat pump system provided by the present invention utilizes a first steam supply pipeline to receive waste heat steam from a waste heat pipeline. After pressurizing the waste heat steam, it can be fed into a branch steam distribution cylinder for user use. A second steam supply pipeline depressurizes the main steam generated by the steam header and feeds it into the branch steam distribution cylinder for user use. Since the first and second steam supply pipelines are connected in parallel to the branch steam distribution cylinder, and each of the first and second steam supply pipelines is equipped with a switch component to regulate its on / off state, switching the on / off state of the switch component can adjust the steam supply from the first or second steam supply pipeline to the user pipeline. This facilitates the full utilization of industrial waste heat while ensuring the user's heating needs, achieving energy saving, carbon reduction, consumption reduction, and efficiency improvement. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the high-temperature steam heat pump in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures

[0029] 10. Low-pressure steam unit; 101. High-temperature heat pump; 102. Hot water circulation pump; 103. Flash evaporator; 104. Level gauge; 105. First pressure sensor; 106. First temperature sensor; 107. Steam inlet valve;

[0030] 20. Water supply unit; 201. Water source; 202. Drive pump; 203. First check valve;

[0031] 30. Boosting steam unit; 301. Steam compressor; 302. Second check valve; 303. Exhaust solenoid valve; 304. Second pressure sensor; 305. Second temperature sensor; 306. Flow meter; 307. First on / off switch; 308. Third check valve;

[0032] 4. Second steam supply pipeline; 401. Steam pressure reducing component; 402. Third on / off switch; 403. Third pressure sensor; 404. Third temperature sensor; 405. Main steam cylinder; 407. Second on / off switch; 408. Fourth check valve;

[0033] 409. Fourth pressure sensor; 410. Fourth temperature sensor; 411. Branch cylinder; 412. Fourth on / off switch; 413. Fifth pressure sensor; 414. Fifth temperature sensor. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0035] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] High-temperature steam heat pumps extract low- to medium-temperature waste heat from industrial enterprises to produce high-temperature steam at 120°C to 180°C. This steam can be used in industrial processes and can replace traditional steam boilers, achieving energy saving, carbon reduction, consumption reduction, and efficiency improvement.

[0037] Currently, high-temperature steam heat pumps have been used in a small number of applications, but there are few commercially available mature high-temperature steam heat pump systems. In practical applications, they cannot completely replace traditional steam boilers. At the same time, the existing high-temperature steam heat pump systems are only used as distributed steam supply applications and have not been able to integrate the generated steam into the original pipeline network for mutual backup.

[0038] Because the high-temperature steam heat pump system is affected by temperature changes at the waste heat end of the waste heat pipe, the steam output fluctuates, impacting user experience. Therefore, it cannot completely replace a traditional steam boiler. Consequently, the steam produced by the high-temperature steam heat pump system is only used as a supplementary steam supply for users. Manual switching is required when switching from the main steam supply, and there is a risk of high-pressure steam crossing over to low-pressure areas.

[0039] Based on the aforementioned related technologies, one or more embodiments of this application provide a high-temperature steam heat pump system, which will be described below in conjunction with the accompanying drawings.

[0040] like Figure 1 As shown, the high-temperature steam heat pump system described in this application includes a first steam supply pipeline, a second steam supply pipeline 4, and a branch steam cylinder 411.

[0041] The first steam supply pipeline includes a low-pressure steam unit 10 connected to a waste heat pipeline and a booster steam unit 30 connected to the low-pressure steam unit 10. The booster steam unit 30 is configured to boost the steam of the low-pressure steam unit 10. The second steam supply pipeline 4 includes a main steam distribution cylinder 405, which is connected to a steam header via a steam pressure reducing component 401. The steam pressure reducing component 401 is configured to reduce the steam pressure of the steam header. A branch steam distribution cylinder 411 is connected to a user-end pipeline. The first steam supply pipeline and the second steam supply pipeline 4 are respectively connected to the branch steam distribution cylinder 411. The first steam supply pipeline and the second steam supply pipeline 4 are respectively equipped with a switch component to regulate their on / off state.

[0042] As can be seen from the above description, the high-temperature steam heat pump system described in this application utilizes the first steam supply pipeline to receive the waste hot water from the waste heat pipeline, converts the waste hot water into steam, pressurizes it, and then connects it to the branch steam cylinder 411 for user use. The second steam supply pipeline 4 depressurizes the main steam generated by the steam header and connects it to the branch steam cylinder 411 for user use. Since the first steam supply pipeline and the second steam supply pipeline 4 are connected in parallel to the branch steam cylinder 411, and the first steam supply pipeline and the second steam supply pipeline 4 are respectively equipped with switching components to regulate their on / off states, by switching the on / off states of the switching components, the steam supply from the first steam supply pipeline or the second steam supply pipeline 4 to the user-end pipeline can be adjusted. This is beneficial for fully utilizing industrial waste heat while ensuring the user's heating needs, achieving energy saving, carbon reduction, consumption reduction, and efficiency improvement.

[0043] In the above embodiments, the waste heat pipeline refers to the pipeline that transports industrial waste heat, and the steam header refers to the pipeline that centrally transports steam generated by multiple steam boilers to various heat-using equipment in large industrial production sites or heating stations. Here, the steam header is used to transport the heat from the steam boilers. Figure 1 The middle user end indicates the connection to the user end pipeline, and the waste heat inlet is connected to the waste heat pipeline.

[0044] Furthermore, it should be noted that the pressurized steam unit and the branch steam cylinder 411 are connected via a first on / off switch 307, and the main steam cylinder 405 and the branch steam cylinder 411 are connected via a second on / off switch 407. The first on / off switch 307 and the second on / off switch 407 are solenoid valves, and their on / off states are switched via external control. Generally, the first on / off switch 307 and the second on / off switch 407 can be simultaneously in an open circuit state or simultaneously in a closed circuit state. When both the first on / off switch 307 and the second on / off switch 407 are in the open circuit state, the waste heat pipeline and the steam header simultaneously supply heat to the user-end pipeline.

[0045] In some embodiments, the low-pressure steam unit 10 includes a high-temperature heat pump 101 connected to a waste heat pipe, and the outlet end of the high-temperature heat pump 101 is connected to a flash evaporator 103.

[0046] In the above embodiment, the high-temperature heat pump 101 converts the heat from the low-to-medium temperature wastewater and waste steam discharged and wasted by industrial enterprises into high-temperature hot water at ≤150°C. After the high-temperature heat pump produces high-temperature hot water, it enters the flash evaporator 103 and becomes low-pressure steam. The low-pressure steam enters the steam compressor 301 and is compressed by the steam compressor 301 to form high-pressure steam that meets the needs of the user's pipeline.

[0047] In the above embodiment, the first steam supply pipeline also includes a water replenishment unit 20. The water replenishment unit 20 includes a water source 201 and a drive pump 202 connected to the water source 201. The water replenishment unit 20 is connected to the flash evaporator 103 of the low-pressure steam unit 10 to replenish water to the flash evaporator 103 through the drive pump 202. For example, the drive pump 202 can be a hot water circulation pump 102 from the related art, and the water source 201 is a water tank storing softened water. Furthermore, to prevent backflow of water in the flash evaporator 103, a first check valve 203 is provided between the flash evaporator 103 and the drive pump 202. A hot water circulation pump 102 for driving water flow is also provided between the flash evaporator 103 and the high-temperature heat pump 101.

[0048] like Figure 1As shown, in some embodiments, a level gauge 104 is also provided on the flash evaporator 103. The level gauge 104 is used to detect the liquid level inside the flash evaporator 103 to ensure the normal operation of the flash evaporator 103. Here, the operating state of the water replenishment unit 20 can be set with reference to the liquid level value of the level gauge 104. When the liquid level inside the flash evaporator 103 reaches the preset liquid level, the pump 202 is driven to operate at a reduced frequency; when the liquid level inside the flash evaporator 103 is lower than the preset liquid level, the pump 202 is driven to operate at a higher frequency, thereby maintaining the liquid level inside the flash evaporator 103 at the preset liquid level.

[0049] In some embodiments, the pressurized steam unit includes a steam compressor 301 connected to the outlet end of the flash evaporator 103, and the pipeline on which the steam compressor 301 is located is connected to an adjusting component for adjusting the exhaust pressure.

[0050] In the above embodiments, exemplarily, the regulating component includes an exhaust solenoid valve 303 connected to the steam compressor 301. The exhaust solenoid valve 303 is connected to the outside environment and regulates the exhaust pressure of the steam compressor 301 by controlling the rotational speed of the steam compressor 301. Furthermore, an inlet valve 107 is provided in the inlet direction of the steam compressor 301, and a flow meter 306 is provided in the outlet direction of the steam compressor 301. The flow meter 306 is used to detect the flow rate of the output steam of the steam compressor 301. Additionally, a second check valve 302 is provided between the steam compressor 301 and the exhaust solenoid valve 303, and a third check valve 308 is provided between the first on / off switch 307 and the branch steam cylinder 411. The second check valve 302 and the second check valve 302 allow steam to flow unidirectionally towards the branch steam cylinder 411.

[0051] In some embodiments, when the steam compressor 301 in the booster steam unit stops running, the first solenoid valve needs to be closed simultaneously, the exhaust solenoid valve 303 needs to be opened, and the exhaust solenoid valve 303 needs to be closed after exhausting steam for a certain period of time to prevent the steam compressor 301 from reversing and damaging the steam compressor 301.

[0052] In some embodiments, the main steam cylinder 405 and the steam header are connected by a third on / off switch 402, and the branch steam cylinder 411 and the user-end pipeline are connected by a fourth on / off switch 412, the opening of which is adjustable.

[0053] Here, the third on / off switch 402 and the fourth on / off switch 412 are manual valves. The fourth on / off switch 412 adjusts its valve opening by rotating the valve, and adjusts the exhaust pressure of the steam compressor 301 by adjusting its valve opening.

[0054] like Figure 1As shown, in some embodiments, the first steam supply line, the second steam supply line 4, and the branch steam cylinder 411 are all provided with detection components, which are configured to detect the pressure and temperature values ​​of the first steam supply line, the second steam supply line 4, and the branch steam cylinder 411.

[0055] For example, the detection component includes a first temperature sensor 106 disposed at the outlet end of the flash evaporator 103. The first temperature sensor 106 is configured to detect the temperature of the delivery pipeline of the low-pressure steam unit 10. The high-temperature heat pump 101 is configured to maintain the temperature of the delivery pipeline of the low-pressure steam unit 10 within a preset temperature range. When the delivery pipeline temperature detected by the first temperature sensor 106 is lower than the preset temperature range, the power of the high-temperature heat pump 101 is increased to make the high-temperature heat pump 101 operate under load. When the delivery pipeline temperature detected by the first temperature sensor 106 is higher than the preset temperature range, the power of the high-temperature heat pump 101 is decreased to make the high-temperature heat pump 101 operate under reduced load.

[0056] Here, the preset temperature range can be determined based on the actual delivery scenario and the temperature requirements of the user's pipeline. Figure 1 It can also be seen that the temperature detected by the first temperature sensor 106 is the temperature of the steam after flashing through the flash evaporator 103. This steam temperature is less than or equal to the steam temperature of the user-end pipeline. Therefore, the preset temperature range should be set comprehensively considering factors such as pipeline transportation loss and pipeline transportation speed.

[0057] In some embodiments, a second temperature sensor 305 is provided between the steam compressor 301 and the branch steam cylinder 411, a third temperature sensor 404 is provided on the main steam cylinder 405, a fourth temperature sensor 410 is provided on the branch steam cylinder 411, and a fifth temperature sensor 414 is provided between the user-end pipeline and the branch steam cylinder 411. By setting temperature sensors in different components and at different locations, the real-time pipeline temperature of the high-temperature steam heat pump system can be monitored more accurately, thereby facilitating grid connection and control.

[0058] In some embodiments, a first pressure sensor 105 is also provided at the outlet end of the flash evaporator 103. The first pressure sensor 105 is used to detect the pipeline pressure of the pipeline where the low-pressure steam unit 10 is located. In some embodiments, the detection component includes a second pressure sensor 304 provided on the pipeline where the steam compressor 301 is located. The second pressure sensor 304 is configured to detect the delivery pipeline pressure of the booster steam unit. The detection component also includes a third pressure sensor 403 provided on the main steam distributor 405 and a fourth pressure sensor 409 provided on the branch steam distributor 411. The steam compressor 301 is configured to maintain the delivery pipeline pressure of the booster steam unit within a first preset pressure range.

[0059] For example, in the initial state, the steam header delivers steam to the user-end pipeline through the main steam distributor 405 and the branch steam distributor 411. The first preset pressure range is set as P = 1.1P4 - 1.2P4 (P4 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 range, the steam compressor 301 increases its power and operates under load. When the exhaust pressure of the steam compressor 301 detected by the second pressure sensor 304 is higher than the first preset pressure range, the steam compressor 301 decreases its power and operates under reduced load. Here, it is only necessary to ensure that the pressure of the delivery pipeline of the booster steam unit is greater than the pressure of the branch steam distributor 411.

[0060] When the pressure value of the second pressure sensor 304 of the booster steam unit is greater than 1.1 times the pressure of the fourth pressure sensor 409 of the branch steam cylinder 411, the grid connection conditions are met, and steam in the waste heat pipeline can enter the branch steam cylinder 411. At this time, the second on / off switch 407 is closed, and the first on / off switch 307 is opened. Steam in the main steam cylinder 405 stops entering the branch steam cylinder 411, and the supply of steam is switched to the waste heat pipeline. It should be noted that during the aforementioned process, when the exhaust pressure of the steam compressor 301 is within the first preset pressure range, it is set by adjusting the speed of the steam compressor 301 or by adjusting the load-bearing power of the steam compressor 301.

[0061] In the above embodiment, the detection component further includes a fifth pressure sensor 413 disposed between the branch steam cylinder 411 and the user-end pipeline. The fifth pressure sensor 413 is configured to detect the delivery pipeline pressure of the user-end pipeline. The steam compressor 301 is configured to keep the delivery pipeline pressure of the user-end pipeline in a second preset pressure range so that the delivery pipeline pressure of the first steam supply pipeline is adapted to the pipeline pressure of the user-end pipeline. This setting can avoid high energy consumption of steam, thereby improving the overall efficiency of the heat pump system.

[0062] For example, when steam is switched to the waste heat pipeline to supply steam using waste heat, considering the mismatch between the user-end pipeline's required pressure and the booster steam unit's delivery pipeline pressure, 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 range of the steam compressor 301 is modified to the second preset pressure range M, according to the model M = 1.1nφ. 2 P5~1.2nφ 2P5, where n is a correction coefficient related to pipeline pressure loss, pipe diameter, etc., φ is the opening degree of the fourth on / off switch 412, and P5 is the pressure value of the fifth pressure sensor 413. Here, when the exhaust pressure of the steam compressor 301 is in the second preset pressure range, it is set by adjusting the opening degree of the fourth on / off switch 412.

[0063] During the switch to the waste heat pipeline to supply steam using waste heat, when the pressure value of the fourth pressure sensor 409 of the branch steam cylinder 411 is lower than 1.1 times the minimum required pressure of the user-end pipeline (i.e., the pressure value of the fifth pressure sensor 413), the first on / off switch 307 is closed and the second on / off switch 407 is opened. The target value range of the exhaust pressure of the steam compressor 301 is adjusted to the first preset pressure range. At this time, the steam from the waste heat pipeline stops entering the branch steam cylinder 411, and the steam supply is switched to the main steam cylinder 405. The aforementioned process of adjusting the load power of the steam compressor 301 is repeated.

[0064] It should be noted that during the above process, there is a situation where both the steam header and the waste heat pipeline simultaneously supply steam to the user-end pipeline.

[0065] Steam from the steam header enters the main steam distribution cylinder 405 after being depressurized by the steam pressure reducing component 401. When the pressure value of the third pressure sensor 403 in the main steam distribution cylinder 405 is lower than the pressure value of the fourth pressure sensor 409, normal steam supply to the user-end pipeline cannot be guaranteed. Therefore, the second on / off switch 407 cannot be directly switched to the open state. At this time, the steam pressure reducing component 401 is adjusted until the pressure in the main steam distribution cylinder 405 is greater than the pressure of the fourth pressure sensor 409 in the branch steam distribution cylinder 411. Then, the second on / off switch 407 is turned on to supply steam to the user-end pipeline. Here, a fourth check valve 408 is also provided between the main steam distribution cylinder 405 and the branch steam distribution cylinder 411. The fourth check valve 408 allows steam to flow unidirectionally towards the branch steam distribution cylinder 411.

[0066] In some embodiments, the high-temperature steam heat pump system is further provided with a control module. The control module can collect detection data from the detection components and adjust different operating states of the high-temperature steam heat pump system according to the detection data. Here, for example, after collecting the temperature information of the first temperature sensor 106, the control module adjusts the operating power of the high-temperature heat pump 101 to make the high-temperature heat pump 101 operate under load or unload. After collecting the pressure information of each pressure sensor, the control module controls the first steam supply pipeline to be connected to the user-end pipeline for steam supply when the grid connection conditions are met, or controls the first on / off switch 307 of the first steam supply pipeline to be disconnected when the grid connection conditions are not met, so that the first steam supply pipeline is disconnected from the user-end pipeline.

[0067] When the high-temperature heat pump 101 in the first steam supply pipeline is fully loaded for a certain period of time, and the temperature value detected by the first temperature sensor 106 of the flash evaporator 103 still cannot reach the preset temperature range, it proves that the waste heat pipeline cannot meet the grid connection conditions when utilizing waste heat and cannot supply steam to the user-end pipeline. At this time, it is necessary to stop the operation of the high-temperature heat pump 101 and report the abnormal information to the control module or cloud monitoring platform. In this example, the control module is a PLC control chip.

[0068] The high-temperature steam heat pump system described in this application can adjust the steam supply temperature reasonably according to the actual steam demand of the end user pipeline during system operation. It can automatically regulate the operation of the high-temperature steam heat pump system, effectively reduce the impact of fluctuations in the output of the high-temperature steam heat pump system on users, and enable the steam produced by the high-temperature steam heat pump to be automatically integrated into the original steam pipeline network. The original steam supply system and the high-temperature steam heat pump system can automatically switch and complement each other.

[0069] Based on the same inventive concept, this application also provides a high-temperature steam heat pump control method, applicable to any of the high-temperature steam heat pump systems described above, the method comprising:

[0070] Obtain the pressure value of the booster steam unit on the first steam supply pipeline, and obtain the pressure value of the branch steam cylinder 411.

[0071] When the pressure value of the booster steam unit exceeds the pressure value of the branch steam cylinder 411 by a value greater than a first preset threshold, the first on / off switch 307 is turned on to connect the first steam supply line to the branch steam cylinder 411, and the second on / off switch 407 is turned off to disconnect the second steam supply line 4 from the branch steam cylinder 411.

[0072] In response to the determination that the pressure value of the branch steam cylinder 411 is lower than the required pressure value of the user-end pipeline but greater than the second preset threshold, the first on / off switch 307 is closed to disconnect the first steam supply pipeline from the branch steam cylinder 411, and the second on / off switch 407 is opened to connect the second steam supply pipeline 4 to the branch steam cylinder 411.

[0073] In the above method, a control module is provided in the high-temperature steam heat pump system. The control module regulates the opening and closing states of the first on / off switch 307 and the second on / off switch 407 by collecting detection data from the detection components. Furthermore, the first and second preset thresholds can be set with reference to the actual operating conditions of the high-temperature steam heat pump. For example, the pressure value of the booster steam unit can be determined by the second pressure sensor 304, and the pressure value of the branch steam cylinder 411 can 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 user-end pipeline demand pressure value, which is also 1.1 times the pressure value of the fifth pressure sensor. This application does not impose absolute limitations on these values.

[0074] Since the high-temperature steam heat pump control method described in this application is applicable to the high-temperature steam heat pump system described in 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.

[0075] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can 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 the details for the sake of brevity.

[0076] The embodiments of this invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A high-temperature steam heat pump system, characterized in that, include: The first steam supply pipeline includes a low-pressure steam unit connected to a waste heat pipeline and a booster steam unit connected to the low-pressure steam unit, wherein the booster steam unit is configured to boost the steam of the low-pressure steam unit. The second steam supply pipeline includes a main steam distribution cylinder, which is connected to the steam header via a steam pressure reducing component, which is configured to reduce the steam pressure in the steam header. A branch steam cylinder is connected to the user-end pipeline. The first steam supply pipeline and the second steam supply pipeline are respectively connected to the branch steam cylinder. The booster steam unit and the branch steam cylinder are connected via a first on / off switch, and the main steam cylinder and the branch steam cylinder are connected via a second on / off switch. When the pressure value of the booster steam unit exceeds the pressure value of the branch steam cylinder by a value greater than a first preset threshold, the first on / off switch is opened to connect the first steam supply pipeline to the branch steam cylinder, and the second on / off switch is closed to disconnect the second steam supply pipeline from the branch steam cylinder. When the pressure value of the branch steam cylinder is lower than the required pressure value of the user-end pipeline by a value greater than a second preset threshold, the first on / off switch is closed to disconnect the first steam supply pipeline from the branch steam cylinder, and the second on / off switch is opened to connect the second steam supply pipeline to the branch steam cylinder.

2. The high-temperature steam heat pump system according to claim 1, characterized in that, The low-pressure steam unit includes a high-temperature heat pump connected to a waste heat pipeline, and a flash evaporator is connected to the outlet end of the high-temperature heat pump. The pressurized steam unit includes a steam compressor connected to the outlet end of the flash evaporator, and the pipeline containing the steam compressor is connected to a regulating component for adjusting the exhaust pressure.

3. The high-temperature steam heat pump system according to claim 2, characterized in that, The first steam supply pipeline also includes a water replenishment unit, which includes a water source and a drive pump connected to the water source. The water replenishment unit is connected to the flash evaporator of the low-pressure steam unit so as to replenish water to the flash evaporator through the drive pump.

4. The high-temperature steam heat pump system according to claim 2, characterized in that, 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, characterized in that, The first steam supply line, the second steam supply line, and the branch steam cylinder are all equipped with detection components, which are configured to detect the pressure and temperature values ​​of the first steam supply line, the second steam supply line, and the branch steam cylinder.

6. The high-temperature steam heat pump system according to claim 5, characterized in that, The detection component includes a temperature sensor located at the outlet end of the flash evaporator, and the temperature sensor is configured to detect the temperature of the delivery pipeline of the low-pressure steam unit; The high-temperature heat pump is configured to maintain the temperature of the delivery pipeline of the low-pressure steam unit within a preset temperature range.

7. The high-temperature steam heat pump system according to claim 5, characterized in that, The detection component includes a second pressure sensor located on the pipeline where the steam compressor is located. The second pressure sensor is configured to detect the pressure of the delivery pipeline of the booster steam unit. The steam compressor is configured to keep the pressure of the delivery pipeline of the booster steam unit within a first preset pressure range, so that the first steam supply pipeline can supply steam to the user-end pipeline.

8. The high-temperature steam heat pump system according to claim 5, characterized in that, The main steam cylinder and the steam header are connected by a third on / off switch, and the branch steam cylinder and the user-end pipeline are connected by a fourth on / off switch. The opening degree of the fourth on / off switch is adjustable.

9. The high-temperature steam heat pump system according to claim 8, characterized in that, The detection component includes a fifth pressure sensor disposed between the branch cylinder and the user-end pipeline, the fifth pressure sensor being configured to detect the delivery pipeline pressure of the user-end pipeline; The steam compressor is configured to keep the pressure of the delivery pipeline of the user-end pipeline within a second preset pressure range, so that the pressure of the delivery pipeline of the first steam supply pipeline is adapted to the pressure of the pipeline of the user-end pipeline.

10. A method for controlling a high-temperature steam heat pump, characterized in that, The method, applicable to any one of claims 1 to 9, comprises: Obtain the pressure value of the booster steam unit on the first steam supply pipeline, and obtain the pressure value of the branch steam cylinder; In response to the determination that the pressure value of the booster steam unit exceeds the pressure value of the branch steam cylinder by a value greater than a first preset threshold, the first on / off switch is opened to connect the first steam supply line with the branch steam cylinder, and the second on / off switch is closed to disconnect the second steam supply line from the branch steam cylinder. In response to the determination that the pressure value of the branch steam cylinder is lower than the required pressure value of the user-end pipeline but greater than a second preset threshold, the first on / off switch is closed to disconnect the first steam supply pipeline from the branch steam cylinder, and the second on / off switch is opened to connect the second steam supply pipeline to the branch steam cylinder.

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