CN210107867U - Propylene flooded refrigeration system - Google Patents
Propylene flooded refrigeration system Download PDFInfo
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- CN210107867U CN210107867U CN201920688767.6U CN201920688767U CN210107867U CN 210107867 U CN210107867 U CN 210107867U CN 201920688767 U CN201920688767 U CN 201920688767U CN 210107867 U CN210107867 U CN 210107867U
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Abstract
The utility model relates to a propylene flooded refrigeration system utilizes the characteristic of make full use of propylene, and the design has built the refrigeration system based on propylene as the refrigerant to design circulating line control method from this, through the cyclic variation of propylene gaseous state, liquid different states, realize the refrigeration operation, make whole with the refrigeration system of propylene as the refrigerant possess following advantage: 1. the OBD value of the refrigerant is 0, and the refrigerant does not damage the ozone layer at all; 2. the unit mass flow rate is large; 3. the thermodynamic performance is better; 4. the lowest evaporation temperature of-60 ℃ can be obtained; 5. the propylene is easy to extract as an auxiliary product of the MTO device, and the cost is relatively low; 6. the system shares the refrigerant system, and the partial load efficiency is higher; so the utility model discloses a propylene flooded refrigeration system and control method when guaranteeing refrigeration effect, can fully improve the utilization ratio of refrigerant.
Description
Technical Field
The utility model relates to a propylene flooded refrigerating system belongs to refrigerating system control technical field.
Background
The technology-MTO for preparing olefin from methanol is a key technology for preparing ethylene and propylene at present, is widely applied at present, and the project for preparing olefin from methanol is increasing at home. One of the key process points of the project for preparing olefin from methanol is the primary cooling liquefaction process of propylene, and as an essential key equipment refrigerating unit in the propylene cooling process, the methanol-to-olefin refrigeration process is used for cooling propylene at 50 ℃ to-38 ℃ at one time, wherein the refrigerant of a common refrigerating unit is difficult to meet the process characteristic requirements of large cooling capacity, large temperature difference and the like. Propylene is an important product in a methanol-to-olefin production device, is a novel refrigerating unit refrigerant, and has many advantages when propylene R1270A is used as a refrigerant: 1. the OBD value of the refrigerant is 0, and the refrigerant does not damage the ozone layer at all; 2. the unit mass flow rate is large; 3. the thermodynamic performance is better; 4. the lowest evaporation temperature of-60 ℃ can be obtained; 5. the propylene is easy to extract as an auxiliary product of the MTO device, and the cost is relatively low; 6. the system shares the refrigerant system, and the partial load efficiency is higher; therefore, if propylene is used as a refrigerant, equipment is designed to realize refrigeration, and the application efficiency of the refrigeration technology is greatly improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a propylene flooded refrigerating system is provided, realize the refrigeration as the refrigerant based on propylene, when guaranteeing the refrigeration effect, can fully improve the utilization ratio of refrigerant.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme: the utility model designs a propylene flooded refrigeration system, which realizes refrigeration based on propylene as a refrigerant and comprises a control module, a condenser, a refrigerant throttling device, an evaporator, a first liquid level sensor, a temperature sensor and at least one compressor assembly; the output end of each compressor assembly is respectively butted with the input end of a condenser through a gas pipeline, the output end of the condenser is butted with the input end of a refrigerant throttling device through a liquid supply pipeline, the output end of the refrigerant throttling device is butted with the input end of an evaporator through an electronic expansion valve of the evaporator through a liquid supply pipeline, a first liquid level sensor is arranged in the evaporator to realize the detection of the liquid level of the refrigerant in the evaporator, a temperature sensor is arranged at the output end of the evaporator, and the output end of the evaporator is respectively butted with the input end of each compressor assembly through the gas pipeline; the propylene refrigerant sequentially passes through the compressor assembly, the condenser, the refrigerant throttling device and the evaporator and then returns to the compressor assembly, and refrigeration is realized through circulation of the propylene refrigerant;
the control module is respectively butted with each compressor assembly to realize the collection of the suction pressure of each compressor assembly and the data transmission; the control module is respectively butted with the refrigerant throttling device, the first liquid level sensor and the electronic expansion valve of the evaporator, and realizes the control of the electronic expansion valve of the evaporator according to the refrigerant liquid level in the evaporator obtained by the first liquid level sensor so as to control the refrigerant liquid supply amount of the evaporator; the control module is in butt joint with the temperature sensor and detects and obtains the temperature of the output end of the evaporator.
As an optimal technical solution of the utility model: the output end of the condenser is in butt joint with the liquid supply input end of the flash evaporator through a liquid supply pipeline and an electronic expansion valve of the flash evaporator, the output end of the flash evaporator is in butt joint with the input end of the refrigerant throttling device, the second liquid level sensor is arranged in the flash evaporator, the control module is in butt joint with the second liquid level sensor and the electronic expansion valve of the flash evaporator respectively, and the control module realizes control over the electronic expansion valve of the flash evaporator according to the liquid level of the refrigerant in the flash evaporator obtained by the second liquid level sensor so as to control the liquid supply amount of the refrigerant of the flash evaporator; meanwhile, the exhaust end of each compressor assembly is respectively butted with the air inlet end of the flash tank through a gas pipeline.
As an optimal technical solution of the utility model: the compressor further comprises a combustion discharge device connected with the control module, and key leakage points on each compressor assembly are respectively in butt joint with the input end of the combustion discharge device through a gas pipeline.
A propylene hydraulic filling formula refrigerating system, technical scheme compares with prior art more than adopting has following technological effect:
the utility model discloses a propylene flooded refrigeration system utilizes the characteristic of make full use of propylene, and the design has built the refrigeration system based on propylene as the refrigerant to design circulating line control method from this, through the cyclic variation of propylene gaseous state, liquid different states, realize the refrigeration operation, make whole with the refrigeration system of propylene as the refrigerant possess following advantage: 1. the OBD value of the refrigerant is 0, and the refrigerant does not damage the ozone layer at all; 2. the unit mass flow rate is large; 3. the thermodynamic performance is better; 4. the lowest evaporation temperature of-60 ℃ can be obtained; 5. the propylene is easy to extract as an auxiliary product of the MTO device, and the cost is relatively low; 6. the system shares the refrigerant system, and the partial load efficiency is higher; so the utility model discloses a propylene flooded refrigeration system and control method when guaranteeing refrigeration effect, can fully improve the utilization ratio of refrigerant.
Drawings
Fig. 1 is a schematic diagram of a module architecture of a propylene flooded refrigeration system of the present invention;
fig. 2 is a schematic diagram of a control architecture of the flooded propylene refrigeration system of the present invention.
Detailed Description
The following description will be provided to further explain embodiments of the present invention in detail with reference to the accompanying drawings.
The utility model discloses a propylene flooded refrigeration system realizes the refrigeration as the refrigerant based on propylene, in the middle of the practical application, as shown in FIG. 2, specifically include control module, condenser, refrigerant throttling arrangement, evaporimeter, first level sensor, temperature sensor, flash tank, second level sensor, burning discharging equipment and an at least compressor unit spare.
As shown in fig. 1, the output end of each compressor assembly is respectively butted with the input end of a condenser through a gas pipeline, the output end of the condenser is butted with the liquid supply input end of a flash evaporator through a liquid supply pipeline and an electronic expansion valve of the flash evaporator, a second liquid level sensor is arranged in the flash evaporator to realize the detection of the liquid level of a refrigerant in the flash evaporator, the output end of the flash evaporator is butted with the input end of a refrigerant throttling device, the output end of the refrigerant throttling device is butted with the input end of an evaporator through the liquid supply pipeline and the electronic expansion valve of the evaporator, a first liquid level sensor is arranged in the evaporator to realize the detection of the liquid level of the refrigerant in the evaporator, a temperature sensor is arranged at the output end of the evaporator, and the output end of the evaporator is respectively butted with the input end of each; the propylene refrigerant sequentially passes through the compressor assembly, the condenser, the refrigerant throttling device and the evaporator and then returns to the compressor assembly, and refrigeration is realized through circulation of the propylene refrigerant.
The control module is respectively butted with each compressor assembly to realize the collection of the suction pressure of each compressor assembly and the data transmission; the control module is respectively butted with the refrigerant throttling device, the first liquid level sensor, the electronic expansion valve of the evaporator, the second liquid level sensor, the electronic expansion valve of the flash evaporator and the combustion discharge device; in practical application, the control module controls the electronic expansion valve of the flash tank according to the refrigerant liquid level in the flash tank obtained by the second liquid level sensor, so as to control the refrigerant liquid supply amount of the flash tank; meanwhile, the exhaust end of each compressor component is respectively butted with the air inlet end of the flash tank through a gas pipeline; the control module controls the electronic expansion valve of the evaporator according to the refrigerant liquid level in the evaporator obtained by the first liquid level sensor, so as to control the refrigerant liquid supply amount of the evaporator; the control module is in butt joint with a temperature sensor and detects and obtains the temperature of the output end of the evaporator; moreover, in practical application, key leakage points on each compressor assembly are respectively butted with the input end of the combustion discharge device through a gas pipeline.
Based on above-mentioned design propylene flooded refrigeration system, the utility model discloses specifically designed control method based on this system, among the practical application, as shown in FIG. 1 and FIG. 2, specifically carry out following step in real time to propylene realizes refrigeration control as the refrigerant.
And step A, the control module controls the opening of the electronic expansion valve of the evaporator and the electronic expansion valve of the flash evaporator to realize the work of the evaporator and the flash evaporator, and the step B is entered.
And step B, the control module obtains the current temperature Te of the output end of the evaporator, and operates according to the preset target temperature Ts of the evaporator and the preset evaporator plus-minus load temperature difference Td as follows:
if Te is more than Ts + Td, entering step C;
if Ts is more than or equal to Te and less than or equal to Ts + Td, entering the step F;
if Te is less than Ts, entering step H;
if Te < Ts-Td, go to step J.
C, judging whether an un-started compressor assembly exists or not, if so, randomly selecting one of the compressor assemblies aiming at the un-started compressor assemblies, updating the compressor assembly to be used as the current compressor assembly for starting, working at preset initial working power, and then entering the step D; otherwise, no further operation is carried out and the step D is carried out.
D, judging whether Te is in a descending trend, if yes, returning to the step B when Te is less than or equal to Ts + Td; otherwise, entering the step E.
And E, judging whether the current load of the current compressor assembly is in a full load state or not by the control module, if so, returning to the step C, otherwise, increasing the power value according to a preset stage, improving the working power of the current compressor assembly, and returning to the step D.
F, the control module judges whether the current load of the compressor assembly is not higher than a preset load lower limit threshold value or not aiming at the compressor assembly which is running and has the maximum running time, if so, the control module controls the compressor assembly to stop, and returns to the step B; otherwise, go to step G. In practical application, the preset lower load threshold is specifically selected to be 10%.
And G, reducing the power value by the control module according to a preset stage, reducing the working power of the current compressor assembly, namely carrying out load shedding aiming at the compressor assembly, reducing the working power of the compressor assembly, and returning to the step B.
And step H, comparing the thermodynamic curve of the propylene refrigerant by the control module according to Te, converting to obtain target suction pressure, respectively sending the target suction pressure to each running compressor assembly, and then entering the step I.
And step I, the controllers of the running compressor assemblies respectively receive the target suction pressure, and automatically reduce the working power value by combining the current suction pressure of the compressors, namely, reducing the load of the compressor assemblies, and returning to the step B.
Step J, judging whether the running compressor assemblies exist or not, if so, controlling all the running compressor assemblies to stop by the control module, and returning to the step B; otherwise, no further operation is carried out, and the step B is returned.
When the steps are executed, the control module controls an electronic expansion valve of the evaporator by adopting a fuzzy PID control method according to the refrigerant liquid level in the evaporator obtained by the first liquid level sensor, so that the refrigerant liquid supply amount of the evaporator is controlled, and the preset refrigerant liquid supply amount requirement of the evaporator is met; meanwhile, the control module controls an electronic expansion valve of the flash tank by adopting a fuzzy PID control method according to the refrigerant liquid level in the flash tank obtained by the second liquid level sensor, so that the refrigerant liquid supply amount of the flash tank is controlled, and the preset refrigerant liquid supply amount requirement of the flash tank is met.
The designed propylene flooded refrigeration system and the control method are applied to practice, and 3 compressor components are selected, wherein the 1# compressor component is a propylene compressor with the refrigeration capacity of 200 Kw; the 2# compressor assembly and the 3# compressor assembly are both 800Kw refrigerating capacity propylene refrigeration compressors; in actual working operation, when the heating heat source of the system is small, the 1# compressor assembly is started; when the load is gradually increased, the 2# compressor assembly and the 3# compressor assembly are restarted; this has the following advantages.
1. The method can adapt to different heat load requirements by starting and stopping the compressor assembly and controlling the capacity of the compressor assembly, achieves accurate control of process points, reduces the running time of the compressor assembly in a low-load interval, and prolongs the running life of a compressor unit; and the energy efficiency ratio of the compressor unit is improved.
2. The designed refrigeration system adopts the shared evaporator, and has larger heat exchange area of the usable evaporator and higher evaporation temperature of the compressor compared with an independent evaporator under partial conformity, and the compressor unit with the same specification can generate larger refrigerating capacity.
3. In the designed refrigerating system, the condenser adopts a common refrigerant system, so that lower condensing pressure can be obtained under partial load, the energy consumption of the compressor can be reduced, and the comprehensive energy efficiency ratio COP of the system can be improved.
4. In the designed refrigerating system, the flash tank enters the compressor unit for intermediate air supplement after being throttled by flash tank, so that the exhaust volume of the compressor under low-temperature working conditions can be improved, lower evaporation pressure can be provided, and higher efficiency can be provided by intermediate air supplement.
5. In the designed refrigerating system, a flash tank liquid level sensor adopts fuzzy PID for self-tuning control.
6. In the designed refrigeration system, the liquid level of the evaporator is subjected to fuzzy PID self-tuning regulation according to the measured value of the liquid level sensor of the evaporator.
7. In the designed refrigerating system, the combustion device collects propylene gas discharged from key leakage points of the system and then intensively discharges the propylene gas to a torch for combustion, thereby avoiding safety accidents such as explosion and the like.
In practical application, the 1# compressor assembly, the 2# compressor assembly and the 3# compressor assembly are parallel and mutually independent systems, and can be independently started, stopped and closed without mutual influence; and the condenser, the evaporator, the flash tank and the refrigerant throttling device are system shared devices, and any compressor assembly is started, and the devices are required to be put into use. The system principle is as follows: the 1# compressor assembly, the 2# compressor assembly and the 3# compressor assembly compress propylene refrigerant gas and then enter a condenser, the condenser is cooled and then enters a flash evaporator to be subjected to secondary deep cooling, the refrigerant enters a refrigerant throttling device after being cooled, the refrigerant enters an evaporator after being throttled to be subjected to heat exchange evaporation, and the evaporated propylene refrigerant gas enters a refrigeration compressor.
According to the propylene flooded refrigeration system and the control method designed by the technical scheme, the refrigeration system based on propylene as a refrigerant is designed and constructed by fully utilizing the characteristics of propylene, and the circulating pipeline control method is designed, so that the refrigeration operation is realized through the circulating change of propylene in different gaseous and liquid states, and the whole refrigeration system taking propylene as the refrigerant has the following advantages: 1. the OBD value of the refrigerant is 0, and the refrigerant does not damage the ozone layer at all; 2. the unit mass flow rate is large; 3. the thermodynamic performance is better; 4. the lowest evaporation temperature of-60 ℃ can be obtained; 5. the propylene is easy to extract as an auxiliary product of the MTO device, and the cost is relatively low; 6. the system shares the refrigerant system, and the partial load efficiency is higher; so the utility model discloses a propylene flooded refrigeration system and control method when guaranteeing refrigeration effect, can fully improve the utilization ratio of refrigerant.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (3)
1. The utility model provides a propylene flooded refrigerating system, realizes refrigerating based on propylene as the refrigerant, its characterized in that: the system comprises a control module, a condenser, a refrigerant throttling device, an evaporator, a first liquid level sensor, a temperature sensor and at least one compressor assembly; the output end of each compressor assembly is respectively butted with the input end of a condenser through a gas pipeline, the output end of the condenser is butted with the input end of a refrigerant throttling device through a liquid supply pipeline, the output end of the refrigerant throttling device is butted with the input end of an evaporator through an electronic expansion valve of the evaporator through a liquid supply pipeline, a first liquid level sensor is arranged in the evaporator to realize the detection of the liquid level of the refrigerant in the evaporator, a temperature sensor is arranged at the output end of the evaporator, and the output end of the evaporator is respectively butted with the input end of each compressor assembly through the gas pipeline; the propylene refrigerant sequentially passes through the compressor assembly, the condenser, the refrigerant throttling device and the evaporator and then returns to the compressor assembly, and refrigeration is realized through circulation of the propylene refrigerant;
the control module is respectively butted with each compressor assembly to realize the collection of the suction pressure of each compressor assembly and the data transmission; the control module is respectively butted with the refrigerant throttling device, the first liquid level sensor and the electronic expansion valve of the evaporator, and realizes the control of the electronic expansion valve of the evaporator according to the refrigerant liquid level in the evaporator obtained by the first liquid level sensor so as to control the refrigerant liquid supply amount of the evaporator; the control module is in butt joint with the temperature sensor and detects and obtains the temperature of the output end of the evaporator.
2. The propylene flooded refrigeration system of claim 1, wherein: the output end of the condenser is in butt joint with the liquid supply input end of the flash evaporator through a liquid supply pipeline and an electronic expansion valve of the flash evaporator, the output end of the flash evaporator is in butt joint with the input end of the refrigerant throttling device, the second liquid level sensor is arranged in the flash evaporator, the control module is in butt joint with the second liquid level sensor and the electronic expansion valve of the flash evaporator respectively, and the control module realizes control over the electronic expansion valve of the flash evaporator according to the liquid level of the refrigerant in the flash evaporator obtained by the second liquid level sensor so as to control the liquid supply amount of the refrigerant of the flash evaporator; meanwhile, the exhaust end of each compressor assembly is respectively butted with the air inlet end of the flash tank through a gas pipeline.
3. A propylene flooded refrigeration system as claimed in claim 1 or claim 2, wherein: the compressor further comprises a combustion discharge device connected with the control module, and key leakage points on each compressor assembly are respectively in butt joint with the input end of the combustion discharge device through a gas pipeline.
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|---|---|---|---|
| CN201920688767.6U CN210107867U (en) | 2019-05-15 | 2019-05-15 | Propylene flooded refrigeration system |
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| CN201920688767.6U CN210107867U (en) | 2019-05-15 | 2019-05-15 | Propylene flooded refrigeration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044132A (en) * | 2019-05-15 | 2019-07-23 | 南京福加自动化科技有限公司 | A kind of propylene full-liquid type refrigeration system and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044132A (en) * | 2019-05-15 | 2019-07-23 | 南京福加自动化科技有限公司 | A kind of propylene full-liquid type refrigeration system and control method |
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Denomination of utility model: A propylene full liquid refrigeration system Effective date of registration: 20220629 Granted publication date: 20200221 Pledgee: Jiangsu Zijin Rural Commercial Bank Co.,Ltd. Qixia sub branch Pledgor: NANJING FUCA AUTOMATION TECHNOLOGY Co.,Ltd. Registration number: Y2022320000320 |