MVR anti-surge control system
By designing the MVR anti-surge control system, the surge valve and pressure & temperature sensor are used to automatically adjust the pressure, the surge problem of the compressor when the suction flow is reduced is solved, and the stable operation of the compressor and the service life are extended.
Patent Information
- Application Number
- CN202421707238.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-18
AI Technical Summary
Existing compressors will experience unstable operation when the suction flow decreases, resulting in rapid continuous fluctuations in suction flow and outlet pressure. Accompanied by high vibration, heating and rapid changes in axial thrust, causing strong vibration and huge noise, called surge, which may damage the compressor.
A MVR anti-surge control system is designed, including an evaporator, a gas-liquid separator, a compressor, a water accumulation tank, a water accumulation pump, a water replenishing tank and a water replenishing pump. Through the cooperation of a surge valve and a pressure & temperature sensor, the inlet and outlet pressure can be automatically adjusted to avoid surge.
It effectively reduces the possibility of surge in the compressor, avoids wear of machine sealing components and bearings, ensures the continuous operation time of the machine, and avoids more serious resonance consequences of pipelines, machines and their basic resonance.
Smart Images
Figure CN222976977U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of MVR, and particularly relates to an MVR anti-surge control system. Background Art
[0002] MVR is widely used in the chemical industry, food industry, pharmaceutical industry, etc. For example, it can directly produce products by concentrating dilute solutions or further cool and crystallize concentrated solutions to produce solid products.
[0003] Existing compressors compress the gas in the evaporator to increase its enthalpy and transfer heat to the inside of the evaporator. If the suction flow rate decreases to a certain value, the compressor will exhibit an unstable working phenomenon, where its suction flow rate and outlet pressure will rapidly and continuously fluctuate, accompanied by high vibration, temperature rise, and rapid change of axial thrust, resulting in strong vibration of the compressor and accompanied by huge noise. This phenomenon is called compressor surge, which may damage the compressor. Content of the Utility Model
[0004] Aiming at the deficiencies of the prior art, the utility model provides an MVR anti-surge control system, which solves the technical problem that when existing compressors compress the gas in the evaporator to increase its enthalpy and transfer heat to the inside of the evaporator, if the suction flow rate decreases to a certain value, the compressor will exhibit an unstable working phenomenon, where its suction flow rate and outlet pressure will rapidly and continuously fluctuate, accompanied by high vibration, temperature rise, and rapid change of axial thrust, resulting in strong vibration of the compressor and accompanied by huge noise. This phenomenon is called compressor surge, which may damage the compressor.
[0005] To achieve the above objectives, the utility model is realized through the following technical solutions:
[0006] An MVR anti-surge control system includes an evaporator, a gas-liquid separator, a compressor, a water accumulation tank, a water accumulation pump, a water replenishment tank, and a water replenishment pump. An inlet pipe and an outlet pipe are installed on the compressor. The inlet pipe is connected to the top of the gas-liquid separator, and a surge valve is connected between the inlet pipe and the outlet pipe.
[0007] Preferably, pressure & temperature sensors are provided on the inlet pipe and the outlet pipe.
[0008] Preferably, the water accumulation tank is installed at the bottom of the inlet pipe, and the water accumulation tank is connected to the water accumulation pump.
[0009] Preferably, the water replenishment pump is connected to the outlet pipe and the water replenishment pump is connected to the water replenishment tank.
[0010] Preferably, the gas-liquid separator is installed on one side of the inlet pipe, and the evaporator is installed on the gas-liquid separator.
[0011] The utility model has the following beneficial effects:
[0012] This solution effectively reduces the possibility of compressor surge in the device, not only avoiding the wear of the machine's sealing components and bearings, ensuring the continuous operation time of the machine, but also avoiding more serious consequences such as resonance of the pipeline, machine and its foundation caused by surge. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings.
[0014] Figure 1 It is the overall structure diagram of the utility model;
[0015] Figure 2 This is a state diagram of a compressor according to Embodiment 1 of the present utility model;
[0016] Figure 3 This is a compressor state diagram of Example 2 of the present utility model.
[0017] Legend: 1. Evaporator; 2. Gas-liquid separator; 3. Compressor; 4. Surge valve; 5. Water accumulation tank; 6. Water accumulation pump; 7. Water make-up tank; 8. Water make-up pump; 31. Inlet pipe; 32. Outlet pipe; 33. Pressure & temperature sensor. DETAILED DESCRIPTION
[0018] The embodiment of the present application provides an MVR anti-surge control system, which effectively solves the problem that the existing compressor compresses the gas in the evaporator to increase its thermal enthalpy and transfers heat to the inside of the evaporator. If the suction flow rate is reduced to a certain value, the compressor will experience an unstable working phenomenon, and its suction flow rate and outlet pressure will fluctuate rapidly and continuously, which may be accompanied by high vibration, rapid changes in temperature rise and axial thrust, causing the compressor to vibrate strongly and make huge noise. This phenomenon is called compressor surge, which may damage the compressor. The present solution effectively reduces the possibility of compressor surge in the device, not only avoids the wear of the machine's sealing components and bearings, and ensures the continuous operation time of the machine, but also avoids more serious consequences such as resonance of the pipeline, machine and its foundation caused by surge. Example
[0019] like Figure 1As shown in the figure, the technical solution in the embodiment of the present application effectively solves the technical problem that in the existing compressor, by compressing the gas in the evaporator to increase its enthalpy and transfer heat to the inside of the evaporator, when the suction flow rate decreases to a certain value, the compressor will exhibit an unstable working phenomenon, where its suction flow rate and outlet pressure will rapidly and continuously fluctuate, manifested as accompanied by high vibration, temperature rise, and rapid change of axial thrust, resulting in strong vibration of the compressor and accompanied by huge noise. This phenomenon is called compressor surge, which may damage the compressor. The general idea is as follows: An MVR anti-surge control system includes an evaporator 1, a gas-liquid separator 2, a compressor 3, a water accumulation tank 5, a water accumulation pump 6, a water replenishment tank 7, and a water replenishment pump 8. An inlet pipe 31 and an outlet pipe 32 are installed on the compressor 3. The inlet pipe 31 is connected to the top of the gas-liquid separator 2. A surge valve 4 is connected between the inlet pipe 31 and the outlet pipe 32. Pressure & temperature sensors 33 are provided on the inlet pipe 31 and the outlet pipe 32. The water accumulation tank 5 is installed at the bottom of the inlet pipe 31. The water accumulation tank 5 is connected to the water accumulation pump 6. The water replenishment pump 8 is connected to the outlet pipe 32. The water replenishment pump 8 is connected to the water replenishment tank 7. The gas-liquid separator 2 is installed on one side of the inlet pipe 31. The evaporator 1 is installed on the gas-liquid separator 2.
[0020] Embodiment 1: As Figure 2 shown, when the pressure & temperature sensors 33 detect large fluctuations in the inlet and outlet pressures, they will automatically adjust the opening of the surge valve 4. The opening is adjusted from 0 to 10%. At this time, the inlet pressure rises from 46.2 kPa to 47.4 kPa, and the outlet pressure drops from 112 kPa to 102.5 kPa. The vibration of the compressor 3 decreases significantly. Compressor vibration 1 decreases from 15.1 μm to 7.3 μm, and compressor vibration 2 decreases from 10.5 μm to 4.4 μm.
[0021] Embodiment 2: As Figure 3 shown, when the pressure & temperature sensors 33 detect that the temperature of the outlet pipe 32 is too high, they will automatically start the water replenishment pump 8 to use the water in the water replenishment tank 7 to reduce the outlet temperature. After the water replenishment pump 8 is turned on, the outlet temperature drops from 118 °C to 105 °C. Compressor vibration 1 decreases from 9.1 μm to 7.2 μm, and compressor vibration 2 decreases from 5.5 μm to 4.5 μm, avoiding the surge of the compressor 3.
[0022] In view of the problems existing in the prior art, the present utility model provides an MVR anti-surge control system. This solution effectively reduces the possibility of the compressor surging in the device, not only avoiding the wear of machine sealing components and bearings, ensuring the continuous operation time of the machine, but also avoiding more serious consequences such as resonance of pipelines, machines, and their foundations caused by surge.
[0023] Finally, it should be noted that: Obviously, the above embodiments are merely examples given to clearly illustrate the present utility model, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present utility model.
Claims
1. An MVR anti-surge control system, characterized in that: The invention comprises an evaporator (1), a gas-liquid separator (2), a compressor (3), a water storage tank (5), a water storage pump (6), a water replenishment tank (7) and a water replenishment pump (8); the compressor (3) is provided with an inlet pipe (31) and an outlet pipe (32); the inlet pipe (31) is connected to the top of the gas-liquid separator (2); and a surge valve (4) is connected between the inlet pipe (31) and the outlet pipe (32).
2. The MVR anti-surge control system according to claim 1, characterized in that: The inlet pipe (31) and the outlet pipe (32) are provided with pressure and temperature sensors (33).
3. The MVR anti-surge control system according to claim 2, characterized in that: The water accumulation tank (5) is installed at the bottom of the inlet pipe (31), and the water accumulation tank (5) and the water accumulation pump (6) are connected together.
4. The MVR anti-surge control system according to claim 2, characterized in that: The water replenishment pump (8) is connected to the outlet pipe (32), and the water replenishment pump (8) is connected to the water replenishment tank (7).
5. The MVR anti-surge control system according to claim 3, characterized in that: The gas-liquid separator (2) is installed on one side of the inlet pipe (31), and the evaporator (1) is installed on the gas-liquid separator (2).