CN-224230368-U - Ammonia water absorption refrigerating system with ammonia water concentration real-time monitoring function

CN224230368UCN 224230368 UCN224230368 UCN 224230368UCN-224230368-U

Abstract

The utility model discloses an ammonia water absorption type refrigerating system with an ammonia water concentration real-time monitoring function, which is an online ammonia water concentration detecting system constructed by a high-precision conductivity sensor matched with a PLC control system, breaks through the technical bottleneck of traditional manual sampling detection or off-line detection with strong hysteresis, can control the concentration detection error in a very small range, effectively solves the problems of low precision, slow response and the like of the traditional detection method, and realizes the dynamic and accurate monitoring of the ammonia water concentration. The PLC control system can dynamically adjust parameters such as heating power of the generator, flow rate of the solution pump, reflux ratio of the rectifying tower and the like based on concentration data, so that the ammonia water solution is always in optimal concentration, energy loss of the system caused by concentration unbalance is effectively reduced, crystallization and corrosion risks of equipment caused by concentration abnormality are reduced, and service life of the equipment is prolonged.

Inventors

ZHANG LIE
SUN XIAOLIN
WANG JINFENG
Huo Xingyuan
ZHANG ZHIPENG
ZHANG CHENCHEN

Assignees

中能绿科(上海)技术有限公司
上海海洋大学

Dates

Publication Date: 20260512
Application Date: 20250603

Claims (10)

1. The ammonia water absorption refrigeration system with the ammonia water concentration real-time monitoring function is characterized by comprising a generator, a rectifying tower, a condenser, a subcooler, an expansion valve, an evaporator, an absorber and a heat exchanger, wherein the generator is arranged at the bottom of the rectifying tower, a top outlet of the rectifying tower is communicated with the condenser, the subcooler, the expansion valve, the evaporator, the absorber, the cold side of the heat exchanger and the rectifying tower are sequentially communicated, an outlet of the generator is communicated with a hot side inlet of the heat exchanger, and a hot side outlet of the heat exchanger is communicated with the absorber; the ammonia absorption refrigeration system further comprises: The detection site of the first conductivity sensor is arranged on a pipeline at the outlet side of the absorber and is used for detecting the outlet conductivity of the absorber in real time; The detection site of the second conductivity sensor is arranged on a pipeline at the outlet side of the generator and is used for detecting the outlet conductivity of the generator in real time; A third conductivity sensor, the detection site of which is arranged on a pipeline at the outlet side of the rectifying tower and used for monitoring the outlet conductivity of the rectifying tower in real time, and And the first conductivity sensor, the second conductivity sensor and the third conductivity sensor are in signal connection with the PLC control system so as to transmit conductivity detection signals to the PLC control system.
2. The aqueous ammonia absorption refrigeration system according to claim 1 further comprising a solution pump disposed between the absorber and the heat exchanger for driving the flow of working medium to the heat exchanger, the probe of the first conductivity sensor extending into a first line communicating between the solution pump and the heat exchanger.
3. The aqueous ammonia absorption refrigeration system according to claim 2 wherein the first end of the first conduit is connected to the outlet of the solution pump and the second end of the first conduit is connected to the cold side inlet of the heat exchanger, the probe of the first conductivity sensor being disposed adjacent the first end of the first conduit.
4. The aqueous ammonia absorption refrigeration system according to claim 1 further comprising a second conduit, a first end of the second conduit being connected to the generator outlet, a first end of the second conduit being connected to the hot side inlet of the heat exchanger, a probe of the second conductivity sensor extending into the second conduit and being positioned adjacent the first end of the second conduit.
5. The aqueous ammonia absorption refrigeration system according to claim 1 further comprising a third conduit, a first end of the third conduit being connected to the outlet of the rectifying column, a second end of the third conduit being connected to the inlet of the condenser, and a probe of the third conductivity sensor extending into the third conduit and being disposed adjacent the first end of the third conduit.
6. The aqueous ammonia absorption refrigeration system according to claim 1, wherein, The first conductivity sensor, the second conductivity sensor and the third conductivity sensor are all arranged on corresponding pipelines in a welding mode; The output signals of the first conductivity sensor, the second conductivity sensor and the third conductivity sensor are current signals of 4-20mA, and/or The first conductivity sensor, the second conductivity sensor, and the third conductivity sensor are corrosion-resistant conductivity sensors.
7. The aqueous ammonia absorption refrigeration system according to claim 2 wherein the solution pump has a flow control valve for controlling flow, the PLC control system being in signal connection with a control unit of the aqueous ammonia absorption refrigeration system, the control unit being in signal connection with the flow control valve for regulating flow of the solution pump.
8. The aqueous ammonia absorption refrigeration system according to claim 1 wherein the generator has a power regulating switch for regulating heating power, the PLC control system being in signal connection with a control unit of the aqueous ammonia absorption refrigeration system, the control unit being in signal connection with the power regulating switch for regulating heating power of the generator.
9. The aqueous ammonia absorption refrigeration system according to claim 1 wherein the absorber has a cooling water switch for regulating the amount of cooling water, the PLC control system being in signal connection with a control unit of the aqueous ammonia absorption refrigeration system, the control unit being in signal connection with the cooling water switch for regulating the amount of cooling water of the absorber.
10. The aqueous ammonia absorption refrigeration system according to claim 1, wherein the rectifying tower has a reflux regulating switch for regulating a reflux ratio, the PLC control system is in signal connection with a control unit of the aqueous ammonia absorption refrigeration system, and the control unit is in signal connection with the reflux regulating switch to regulate the reflux ratio of the rectifying tower.

Description

Ammonia water absorption refrigerating system with ammonia water concentration real-time monitoring function Technical Field The utility model relates to the field of ammonia water absorption refrigeration systems, in particular to an ammonia water absorption refrigeration system with an ammonia water concentration real-time monitoring function. Background An absorption refrigeration system is a device for realizing a refrigeration function through solution absorption and evaporation heat conversion, and plays an important role in the industrial and civil refrigeration fields. As a core working medium of an absorption refrigeration system, ammonia water is widely applied to small and medium-sized refrigeration devices due to higher absorption efficiency and good thermophysical properties. The ammonia water concentration is used as a key parameter affecting the refrigerating performance and the running efficiency of the system, and the accuracy of detection directly relates to whether the system can realize stable and efficient running. Currently, mainstream ammonia concentration detection technologies in the market, such as a gravitational method, a chemical titration method, a conductivity method and the like, expose a plurality of limitations in practical application. The traditional detection methods have the problems of complex operation flow, slow response speed, easy interference of environmental factors on the measurement results and the like, and are difficult to meet the requirements of modern refrigeration systems on detection precision and instantaneity. Disclosure of utility model In order to solve the problems, the utility model aims to provide an ammonia water absorption type refrigerating system with an ammonia water concentration real-time monitoring function, which is provided with an ammonia water concentration real-time detection device and can accurately detect the concentration of an ammonia water solution in the system in real time, thereby providing basis for the operation control of the system and better improving the operation efficiency and stability of the system. The ammonia water absorption refrigeration system with the ammonia water concentration real-time monitoring function comprises a generator, a rectifying tower, a condenser, a subcooler, an expansion valve, an evaporator, an absorber and a heat exchanger, wherein the generator is arranged at the bottom of the rectifying tower, the top outlet of the rectifying tower is communicated with the condenser, the subcooler, the expansion valve, the evaporator, the absorber and the cold side of the heat exchanger are sequentially communicated, the outlet of the generator is communicated with the hot side inlet of the heat exchanger, the hot side outlet of the heat exchanger is communicated with the ammonia water absorber, the absorption refrigeration system further comprises a first conductivity sensor, the detection site of the first conductivity sensor is arranged on a pipeline at the outlet side of the absorber and used for detecting the outlet conductivity of the absorber in real time, the detection site of the second conductivity sensor is arranged on a pipeline at the outlet side of the generator and used for detecting the outlet of the generator in real time, the third conductivity sensor is arranged at the outlet side of the third conductivity sensor and the third conductivity sensor is connected with the PLC, and the third conductivity sensor is connected with the third conductivity sensor and the PLC. Optionally, the ammonia absorption refrigeration system further comprises a solution pump, wherein the solution pump is arranged between the absorber and the heat exchanger and used for driving working medium to flow towards the heat exchanger, and the probe of the first conductivity sensor extends into a first pipeline communicated between the solution pump and the heat exchanger. Optionally, the first end of the first pipeline is connected to the outlet of the solution pump, the second end of the first pipeline is connected to the cold side inlet of the heat exchanger, and the probe of the first conductivity sensor is disposed adjacent to the first end of the first pipeline. Optionally, the ammonia absorption refrigeration system further comprises a second pipeline, a first end of the second pipeline is connected with the outlet of the generator, a first end of the second pipeline is connected with the hot side inlet of the heat exchanger, and the probe of the second conductivity sensor extends into the second pipeline and is arranged close to the first end of the second pipeline. Optionally, the ammonia absorption refrigeration system further comprises a third pipeline, a first end of the third pipeline is connected with the outlet of the rectifying tower, a second end of the third pipeline is connected with the inlet of the condenser, and the probe of the third conductivity sensor extends into the third pipeline and is a