Lithium bromide absorption heat pump monitoring system based on DCS

Abstract

The utility model relates to a DCS-based lithium bromide absorption heat pump monitoring system, which relates to the technical field of heat pump monitoring, and comprises a data acquisition unit, a DCS control unit, a PLC control unit and an execution unit, the input end of the data acquisition unit is electrically connected with the lithium bromide absorption heat pump, the output end of the data acquisition unit is connected to the signal input end of the DCS control unit and the signal input end of the PLC control unit, and the DCS control unit is electrically connected with the PLC control unit. The output end of the DCS control unit and the output end of the PLC control unit are both electrically connected with the execution unit, and the output end of the execution unit is electrically connected with the lithium bromide absorption heat pump. The lithium bromide absorption heat pump monitoring system has the effect of monitoring the lithium bromide absorption heat pump in real time.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump monitoring, and in particular to a DCS-based lithium bromide absorption heat pump monitoring system. Background Art

[0002] With the continuous development of the times, the country attaches increasing importance to energy utilization. At present, a large amount of low-temperature thermal energy such as hot water at about 50°C is often generated in industrial production. Recycling and reusing this part of thermal energy can reduce carbon emissions, which is conducive to the realization of dual carbon goals and is one of the important means to save energy and reduce costs.

[0003] A heat pump is a device that transfers heat energy from a low-temperature heat source to a high-temperature heat source at the cost of consuming some low-grade energy. Among them, lithium bromide absorption heat pump is an important branch of the current domestic heat pump application field; lithium bromide absorption heat pump is an important branch of the current domestic heat pump application field. The lithium bromide absorption heat pump includes a generator, a solution heat exchanger, an absorber, a condenser and an evaporator. H2O-LiBr solution is used as the operating fluid, and the thermal process of internal circulation flow is realized through pipes, valves and pumps.

[0004] Lithium bromide absorption heat pumps are widely used in many projects due to their excellent performance. However, at present, this type of heat pump unit faces problems such as low intelligence, unclear equipment operation information, and difficult maintenance, which greatly hinders the promotion and development of lithium bromide absorption heat pumps. Utility Model Content

[0005] In order to achieve real-time monitoring of a lithium bromide absorption heat pump, the present application provides a DCS-based lithium bromide absorption heat pump monitoring system.

[0006] The present application provides a DCS-based lithium bromide absorption heat pump monitoring system, which adopts the following technical solutions:

[0007] A DCS-based lithium bromide absorption heat pump monitoring system comprises a data acquisition unit, a DCS control unit, a PLC control unit and an execution unit; the input end of the data acquisition unit is electrically connected to the lithium bromide absorption heat pump, the output end of the data acquisition unit is respectively connected to the signal input end of the DCS control unit and the signal input end of the PLC control unit, the DCS control unit is electrically connected to the PLC control unit, the output end of the DCS control unit and the output end of the PLC control unit are both electrically connected to the execution unit, and the output end of the execution unit is electrically connected to the lithium bromide absorption heat pump.

[0008] By adopting the above technical solution, when the lithium bromide absorption heat pump is working, the data acquisition unit can collect data from various components of the lithium bromide absorption heat pump, so that the DCS control unit and the PLC control unit can control the lithium bromide absorption heat pump in real time. At the same time, the DCS control unit and the PLC control unit cooperate to control the operation of the lithium bromide absorption heat pump, which is more reliable and safe.

[0009] Optionally, the data acquisition unit includes a temperature sensor, a pressure sensor and a rotary encoder, and the temperature sensor, pressure sensor and rotary encoder are all electrically connected to the DCS control unit, and the temperature sensor, pressure sensor and rotary encoder are all electrically connected to the PLC control unit.

[0010] By adopting the above technical solution, the temperature sensor collects the temperature data of the lithium bromide absorption heat pump, the pressure sensor collects the pressure data of the pipeline in the lithium bromide absorption heat pump, and the rotary encoder can detect the opening data and operating speed of the pipeline valve of the lithium bromide absorption heat pump, and transmit the above data to the DCS control unit and the PLC control unit for convenient monitoring and control.

[0011] Optionally, the data acquisition unit further includes a switch quantity acquisition module; the switch quantity acquisition module is electrically connected to the DCS control unit and the PLC control unit respectively, and the switch quantity acquisition module can acquire the switch quantity signal of the lithium bromide absorption heat pump.

[0012] By adopting the above technical solution, the switching quantity of the lithium bromide absorption heat pump is collected, so that the DCS control unit and the PLC control unit can understand the working status of the lithium bromide absorption heat pump in real time, which is convenient for the DCS control unit and the PLC control unit to control the working status of each component of the lithium bromide absorption heat pump.

[0013] Optionally, the data acquisition unit further includes an acoustic wave sensor, which is installed on a pipeline of the lithium bromide absorption heat pump, and is electrically connected to the DCS control unit and the PLC control unit, respectively.

[0014] By adopting the above technical solution, the acoustic wave sensor can detect the acoustic wave information of the lithium bromide absorption heat pump pipeline, and then transmit the acoustic wave information to the DCS control unit and the PLC control unit. Both the DCS control unit and the PLC control unit can compare the detected acoustic wave information with the preset acoustic wave information. If the detected acoustic wave information is inconsistent with the preset acoustic wave information, it can be determined that an abnormality has occurred in the pipeline.

[0015] Optionally, the DCS control unit is also electrically connected to a memory, and the memory is also electrically connected to the PLC control unit.

[0016] By adopting the above technical solution, the memory can store the operating data of the lithium bromide absorption heat pump and the data collected by the data acquisition unit, which is convenient for staff to view and retrieve.

[0017] Optionally, the PLC control unit is wirelessly connected to a wireless communication component, and the wireless communication component is also wirelessly connected to a mobile terminal.

[0018] By adopting the above technical solution, the staff can remotely understand the working status of the lithium bromide absorption heat pump through the mobile terminal, and can also operate the mobile terminal to send control commands to the PLC control unit through the wireless communication component to control the working status of the lithium bromide absorption heat pump, which is more convenient.

[0019] Optionally, the PLC control unit is electrically connected to a display, and the display is also electrically connected to the DCS control unit.

[0020] By adopting the above technical solution, the staff can understand the operating data of the lithium bromide absorption heat pump more conveniently.

[0021] Optionally, the PLC control unit is electrically connected to an alarm unit.

[0022] By adopting the above technical solution, when the lithium bromide absorption heat pump operates abnormally, the PLC control unit controls the alarm unit output to remind the staff.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. When the lithium bromide absorption heat pump is working, the data acquisition unit can collect data from various components of the lithium bromide absorption heat pump, so that the DCS control unit and the PLC control unit can control the lithium bromide absorption heat pump in real time. At the same time, the DCS control unit and the PLC control unit coordinately control the operation of the lithium bromide absorption heat pump, which is more reliable and safe;

[0025] 2. The temperature sensor collects the temperature data of the lithium bromide absorption heat pump, the pressure sensor collects the pressure data of the pipeline in the lithium bromide absorption heat pump, and the rotary encoder can detect the opening data and working speed of the pipeline valve of the lithium bromide absorption heat pump, and transmit the above data to the DCS control unit and the PLC control unit for easy monitoring and control;

[0026] 3. The acoustic wave sensor can detect the acoustic wave information of the lithium bromide absorption heat pump pipeline, and then transmit the acoustic wave information to the DCS control unit and the PLC control unit. Both the DCS control unit and the PLC control unit can compare the detected acoustic wave information with the preset acoustic wave information. If the detected acoustic wave information is inconsistent with the preset acoustic wave information, it can be determined that the pipeline is abnormal. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural block diagram of a DCS-based lithium bromide absorption heat pump monitoring system in an embodiment of the present application.

[0028] Explanation of the accompanying drawings: 1. Data acquisition unit; 11. Temperature sensor; 12. Pressure sensor; 13. Rotary encoder; 131. Encoder; 132. Motor tachometer; 14. Switch quantity acquisition module; 15. Acoustic wave sensor; 2. DCS control unit; 3. PLC control unit; 4. Execution unit; 5. Memory; 6. Wireless communication component; 7. Mobile terminal; 8. Display; 9. Alarm unit. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1 It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] The present application embodiment discloses a DCS-based lithium bromide absorption heat pump monitoring system. Figure 1 A DCS-based lithium bromide absorption heat pump monitoring system includes a data acquisition unit 1, a DCS control unit 2, a PLC control unit 3 and an execution unit 4; the output end of the data acquisition unit 1 is respectively connected to the signal input end of the DCS control unit 2 and the signal input end of the PLC control unit 3, the DCS control unit 2 is electrically connected to the PLC control unit 3, the output end of the DCS control unit 2 and the output end of the PLC control unit 3 are both electrically connected to the input end of the execution unit 4, and the output end of the execution unit 4 is electrically connected to the lithium bromide absorption heat pump.

[0031] In this embodiment, during the operation of the lithium bromide absorption heat pump, the data acquisition unit 1 can collect data from various components in the lithium bromide absorption heat pump, and then transmit the collected data to the DCS control unit 2 and the PLC control unit 3. The DCS control unit 2 and the PLC control unit 3 work together to transmit a control signal to the execution unit 4 according to the collected data, so that the execution unit 4 executes the corresponding control signal to realize the control and monitoring of the lithium bromide absorption heat pump.

[0032] It is worth noting that the execution unit 4 can be any component of the lithium bromide absorption heat pump, or a valve on the pipeline of the lithium bromide absorption heat pump.

[0033] Reference Figure 1The data acquisition unit 1 includes a temperature sensor 11, a pressure sensor 12 and a rotary encoder 13. The temperature sensor 11, the pressure sensor 12 and the rotary encoder 13 are all electrically connected to the DCS control unit 2. The temperature sensor 11, the pressure sensor 12 and the rotary encoder 13 are all electrically connected to the PLC control unit 3.

[0034] In this embodiment, the temperature sensor 11 can collect the temperature of each component of the lithium bromide absorption heat pump when it is working, the pressure sensor 12 monitors the pressure in the pipeline when the lithium bromide absorption heat pump is working, and the rotary encoder 13 includes an encoder 131 for measuring the valve opening and a motor tachometer 132 for measuring the lithium bromide absorption heat pump; on the one hand, the temperature sensor 11, the pressure sensor 12, the encoder 131 and the motor tachometer 132 transmit the collected data to the DCS control unit 2, and the DCS control unit 2 monitors the lithium bromide absorption heat pump in real time according to the collected data, and at the same time, the DCS control unit 2 The CS control unit 2 can transmit the collected data to the PLC control unit 3; on the other hand, the PLC control unit 3 can also directly receive the collected data from the temperature sensor 11, the pressure sensor 12, the encoder 131 and the motor tachometer 132, and then the PLC control unit 3 controls the corresponding execution unit 4 according to the received collected data. For example, when the valve opening collected by the encoder 131 is less than the opening output by the PLC control unit 3, the PLC control unit 3 outputs a control signal to increase the valve opening until the valve opening reaches the opening output by the PLC control unit 3.

[0035] Among them, the various components include an evaporator, an absorber, a generator and a condenser.

[0036] As an optional implementation of this embodiment, the data acquisition unit 1 also includes a switch quantity acquisition module 14, which is electrically connected to the DCS control unit 2 and the PLC control unit 3 respectively, and the switch quantity acquisition module 14 can collect the switch quantity signal of the lithium bromide absorption heat pump.

[0037] Since various components work together in the process of controlling the lithium bromide absorption heat pump, it is necessary to detect the switching quantity of each component, so as to realize the switching quantity monitoring of the lithium bromide absorption heat pump, and then realize the switching quantity regulation of the lithium bromide absorption heat pump.

[0038] As an optional implementation of this embodiment, the data acquisition unit 1 further includes an acoustic wave sensor 15 installed on the pipeline of the lithium bromide absorption heat pump, and the acoustic wave sensor 15 is electrically connected to the DCS control unit 2 and the PLC control unit 3 respectively.

[0039] Since the lithium bromide absorption heat pump may cause pipeline rupture when it is working, and since the sound waves emitted at the pipeline rupture are different from the sound waves of the lithium bromide absorption heat pump when it is working, the sound waves are collected by the sound wave sensor 15 and transmitted to the DCS control unit 2 and the PLC control unit 3. When the DCS control unit 2 determines that the pipeline is ruptured, the PLC control unit 3 can control the lithium bromide absorption heat pump to stop working in time, thereby reducing the loss caused by the pipeline rupture.

[0040] In this embodiment, the DCS control unit 2 is also electrically connected to a memory 5, and the memory 5 is also electrically connected to the PLC control unit 3; the memory 5 can store the data collected by the data acquisition unit 1, so as to facilitate the staff to view the working data of the lithium bromide absorption heat pump.

[0041] In this embodiment, the PLC control unit 3 is also wirelessly connected to a wireless communication component 6 , and the wireless communication component 6 is wirelessly connected to a mobile terminal 7 .

[0042] The staff operates the mobile terminal 7 and transmits the control signal to the PLC control unit 3 through the wireless communication component 6, thereby realizing remote control.

[0043] It is worth noting that the wireless communication component 6 can be a lora communication component or a wireless communication radio station.

[0044] In this embodiment, the PLC control unit 3 is also electrically connected to a display 8, and the display 8 is also electrically connected to the DCS control unit 2. The staff can query the data stored in the memory 5 through the display 8, and can also check the working status of each component of the lithium bromide absorption heat pump through the display 8.

[0045] In this embodiment, the PLC control unit 3 is also electrically connected to the alarm unit 9. When the pipeline of the lithium bromide absorption heat pump is broken or the collected data is abnormal, the PLC control unit 3 controls the alarm unit 9 to output, thereby reminding the staff.

[0046] It is worth noting that the alarm unit 9 can be an audible and visual alarm, or a network alarm, telephone alarm or SMS alarm sent by the wireless communication component 6 .

[0047] The implementation principle of a lithium bromide absorption heat pump monitoring system in an embodiment of the present application is as follows: when the lithium bromide absorption heat pump is working, the data acquisition unit 1 collects the operating data of the lithium bromide absorption heat pump, and then the data acquisition unit 1 transmits the collected data to the DCS control unit 2 and the PLC control unit 3, the DCS control unit 2 and the PLC control unit control the execution unit 4 to execute, which is convenient for controlling the lithium bromide absorption heat pump. The data of the lithium bromide absorption heat pump is collected in real time by the data acquisition unit 1, and then the DCS control unit 2 and the PLC control unit 3 coordinately control the lithium bromide absorption heat pump, which is more convenient.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

Claims

1. A DCS-based lithium bromide absorption heat pump monitoring system, characterized in that: The invention comprises a data acquisition unit (1), a DCS control unit (2), a PLC control unit (3) and an execution unit (4); the input end of the data acquisition unit (1) is electrically connected to the lithium bromide absorption heat pump, the output end of the data acquisition unit (1) is respectively connected to the signal input end of the DCS control unit (2) and the signal input end of the PLC control unit (3), the DCS control unit (2) is electrically connected to the PLC control unit (3), the output end of the DCS control unit (2) and the output end of the PLC control unit (3) are both electrically connected to the execution unit (4), and the output end of the execution unit (4) is electrically connected to the lithium bromide absorption heat pump.

2. A DCS-based lithium bromide absorption heat pump monitoring system according to claim 1, characterized in that: The data acquisition unit (1) comprises a temperature sensor (11), a pressure sensor (12) and a rotary encoder (13); the temperature sensor (11), the pressure sensor (12) and the rotary encoder (13) are all electrically connected to the DCS control unit (2); and the temperature sensor (11), the pressure sensor (12) and the rotary encoder (13) are all electrically connected to the PLC control unit (3).

3. A DCS-based lithium bromide absorption heat pump monitoring system according to claim 2, characterized in that: The data acquisition unit (1) further comprises a switch quantity acquisition module (14); the switch quantity acquisition module (14) is electrically connected to the DCS control unit (2) and the PLC control unit (3), respectively, and the switch quantity acquisition module (14) is capable of acquiring switch quantity signals of the lithium bromide absorption heat pump.

4. A DCS-based lithium bromide absorption heat pump monitoring system according to any one of claims 1 to 3, characterized in that: The data acquisition unit (1) further comprises an acoustic wave sensor (15), wherein the acoustic wave sensor (15) is mounted on a pipeline of the lithium bromide absorption heat pump, and the acoustic wave sensor (15) is electrically connected to the DCS control unit (2) and the PLC control unit (3), respectively.

5. A DCS-based lithium bromide absorption heat pump monitoring system according to claim 1, characterized in that: The DCS control unit (2) is also electrically connected to a memory (5), and the memory (5) is also electrically connected to the PLC control unit (3).

6. A DCS-based lithium bromide absorption heat pump monitoring system according to claim 1, characterized in that: The PLC control unit (3) is wirelessly connected to a wireless communication component (6), and the wireless communication component (6) is also wirelessly connected to a mobile terminal (7).

7. A DCS-based lithium bromide absorption heat pump monitoring system according to claim 1, characterized in that: The PLC control unit (3) is electrically connected to a display (8), and the display (8) is also electrically connected to the DCS control unit (2).

8. A DCS-based lithium bromide absorption heat pump monitoring system according to claim 1, characterized in that: The PLC control unit (3) is electrically connected to an alarm unit (9).

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