CN204100672U - Refrigeration system refrigerant recovery system - Google Patents
Refrigeration system refrigerant recovery system Download PDFInfo
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- CN204100672U CN204100672U CN201420600627.6U CN201420600627U CN204100672U CN 204100672 U CN204100672 U CN 204100672U CN 201420600627 U CN201420600627 U CN 201420600627U CN 204100672 U CN204100672 U CN 204100672U
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Abstract
The utility model relates to a kind of refrigeration system refrigerant recovery process and system, be applicable to the cryogenic system of petrochemical plant, refrigeration system refrigerant recovery process comprises step: 1) set a force value, and when making surge tank pressure exceed this setup pressure value, cold-producing medium pressure release is discharged; 2) lifting step 1) in the pressure release pressure of cold-producing medium of discharging to exceeding pressure of storage tank; 3) by the cold-producing medium after pressure-raising stored in storage tank.Refrigeration system refrigerant recovery system, comprises surge tank, and described surge tank connects a compressor by suction line, and compressor connects storage tank by outlet line, and suction line and outlet line are equipped with control valve.When the utility model is between driving initial stage trial run period or at device exception parking, cold-producing medium can be reclaimed in time, avoid a large amount of wastes of cold-producing medium, reduce system energy consumption simultaneously, reduce production cost.
Description
Technical field
The utility model relates to a kind of refrigeration system refrigerant recovery system, is applicable to the cryogenic system of petrochemical plant.
Background technology
In chemical products production process, often need to adopt cryogenic system to carry out K cryogenic treatment, the normal cold-producing medium adopted comprises propylene, ethene, methane, ethane, propane etc.As in the production process of propylene, conventional cold-producing medium comprises propylene, ethene etc.
Propylene can be made by dehydrogenating propane, domestic dehydrogenating propane device of having driven and building mainly adopts the CATOFIN patented technology of LUMMUS company and the Oleflex technology of Uop Inc. at present, is that raw material produces polymerization-grade propylene by catalytic dehydrogenation with propane.Propane feed carries out dehydrogenation reaction in fixed bed reactors, gas after dehydrogenation is compressed, low temperature reclaims, obtain product propylene after product purification, and wherein low temperature reclaims is from reactor product, remove most inert gas and light component by propylene refrigeration system, ethylene refrigeration system; The low temperature being rich in hydrogen reclaims the reducing gases of tail gas part for catalyst, and all the other then deliver to PSA unit out-of-bounds.Product purification unit is sent to after propane, propylene and heavy constituent condensation.
Propylene is adopted to be a closed circuit circulatory system as the propylene refrigeration system of cold-producing medium.The level Four centrifugal compressor driven by steam turbine provides the refrigerant of Three Estate :+13 DEG C ,-1 DEG C ,-35 DEG C.
The operating pressure 0.07MPaG of the one-level inlet buffer of propylene compressor, operating temperature-35 DEG C, the operating pressure 0.47MPaG of secondary inlet surge tank, operating temperature-1 DEG C, the operating pressure 0.74MPaG of three grades of inlet buffer, operating temperature 13 DEG C, one-level inlet buffer and secondary inlet surge tank design pressure are 0.75MPaG, and the setting pressure of safety valve is 0.75MPaG; The design pressure 1.72MPaG of three grades of inlet buffer, the setting pressure of safety valve is 1.72MPaG.When continuous normal operating, the safety valve and the pressure-regulating valve that are discharged into torch are in closed condition, loses without cold-producing medium (propylene).But when driving between initial stage trial run period or at device exception parking, propylene refrigeration system is in dead ship condition, because the operating temperature of the loss surge tank of cold slowly rises, when temperature rises to 13 DEG C, safety valve jumping up, pressure-regulating valve is also in opening, and a large amount of propylene is discharged into flare system, causes great waste.
Ethylene refrigeration system is a closed circuit circulatory system, and it is the 2 grades of centrifugal compressors driven by motor, provides 2 grade refrigerants :-63 DEG C ,-101 DEG C, by ethene return line for every grade of compression provides minimum discharge to protect.
Ethylene compressor refrigeration system is similar to propylene compressor refrigeration system.The operating pressure 0.56MPaG of the one-level inlet buffer of ethylene compressor, operating temperature-63 DEG C, the operating pressure 0.02MPaG of secondary inlet surge tank, operating temperature-101 DEG C; First-level buffer tank and level 2 buffering tank design pressure are 1.16MPaG, and the setting pressure of safety valve is 1.16MPaG; When continuous normal operating, the safety valve and the pressure-regulating valve that are discharged into torch are in closed condition, loses without cold-producing medium (ethene).But when driving between initial stage trial run period or at device exception parking, ethylene refrigeration system is in dead ship condition, because the operating temperature of the loss surge tank of cold slowly rises, when temperature rises to-45 DEG C, safety valve jumping up, pressure-regulating valve is also in opening, and a large amount of ethene alkene is discharged into flare system, causes great waste.
Utility model content
According to above the deficiencies in the prior art, technical problem to be solved in the utility model is: provide a kind of refrigeration system refrigerant recovery process, when driving between initial stage trial run period or at device exception parking, avoids a large amount of wastes of cold-producing medium, reduce system energy consumption simultaneously, reduce production cost.
The utility model additionally provides a kind of refrigeration system refrigerant recovery system realizing above-mentioned technique.
This refrigeration system refrigerant recovery process, comprises the surge tank in refrigeration system, comprises the following steps: 1) set a force value, and when making surge tank pressure exceed this setup pressure value, cold-producing medium pressure release is discharged; 2) lifting step 1) in the pressure release pressure of cold-producing medium of discharging to exceeding pressure of storage tank; 3) by the cold-producing medium after pressure-raising stored in storage tank.
Connection safety valve on described surge tank, step 1) in setup pressure value be less than refrigeration system safety valve setting pressure.
Described step 1) in setup pressure value be 1.1 times of surge tanks operating pressure ~ 0.95 times surge tank on the setting pressure of safety valve.
Also comprise step 4): by step 3) in cold-producing medium in storage tank be supplemented to refrigeration system.
Refrigeration system refrigerant recovery system, comprises surge tank, and described surge tank connects a compressor by suction line, and compressor connects storage tank by outlet line, and suction line and outlet line are equipped with control valve.
Described suction line is connected by importing and exporting cross-line with between outlet line, imports and exports cross-line and is provided with control valve.
Described surge tank connects flare system by safety valve system, pressure-regulating valve system, and described suction line is associated with pressure-regulating valve system, safety valve system by pressure signal line.
Compared with prior art, the beneficial effect that the utility model has is:
1) pressure release of surge tank is controlled by suction line and control valve, the cold-producing medium that pressure release is discharged enters compressor pressure-raising, cold-producing medium after pressure-raising enters through outlet line again to be had in the storage tank of certain pressure, directly be discharged into torch after avoiding cold-producing medium to exceed safety valve pressure, cause a large amount of wastes of cold-producing medium.
2) because discharge refrigerant is very low to temperature during flare system, first need to carry out heat temperature raising with steam, thus add the energy consumption of system, the utility model, by reclaiming cold-producing medium, reduces energy consumption, reduces production cost.
3) by importing and exporting cross-line connection outlet pipeline and suction line, making cold-producing medium in storage tank when needs, suction line can be entered along outlet line, then enter refrigeration system, reach the object again utilized.
4) by arranging pressure signal line, when the pressure of suction line sharply rises, when recovery system can not effectively digest, by pressure signal line detected pressures, cold-producing medium is discharged into torch by safety valve system, pressure-regulating valve system again, ensures the safety of system.
5) this recovery process and recovery system can be used for adopting propylene, ethene, the cryogenic system that the multiple cold-producing mediums such as methane, ethane, propane are used alone or in combination, applied widely.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Fig. 2 is ethylene refrigeration system architecture schematic diagram;
Fig. 3 is propylene refrigeration system structural representation.
In figure: 1, refrigeration system compressor; 2, surge tank; 3, safety valve system; 4, pressure-regulating valve system; 5, flare system; 6, suction line; 7, pressure signal line; 8, cross-line is imported and exported; 9, storage tank; 10, outlet line; 11, helical-lobe compressor; 101, ethylene compressor; 102, propylene compressor; 2.1, first order inlet buffer; 2.2, second level inlet buffer; 201, one-level inlet buffer; 202, secondary inlet surge tank; 203, three grades of inlet buffer.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
Embodiment 1
As shown in Figure 1, refrigeration system refrigerant recovery system, comprise surge tank 2, refrigeration system compressor 1, refrigeration system compressor 1 connects surge tank 2, and surge tank 2 connects flare system 5 by safety valve system 3, pressure-regulating valve system 4.
Surge tank 2 connects a helical-lobe compressor 11 by suction line 6, helical-lobe compressor 11 connects storage tank 9 by outlet line 10, suction line 6 and outlet line 10 are equipped with control valve, being connected by importing and exporting cross-line 8 between suction line 6 with outlet line 10, importing and exporting cross-line 8 and being provided with control valve.Suction line 6 is associated with pressure-regulating valve system 4, safety valve system 3 by pressure signal line 7.
This refrigeration system refrigerant recovery process, comprise the following steps: 1) set a force value, when making surge tank 2 pressure exceed this setup pressure value, cold-producing medium pressure release is discharged, setup pressure value is less than refrigeration system safety valve setting pressure, the setting pressure of safety valve on the operating pressure ~ 0.95 times surge tank being generally 1.1 times of surge tanks; 2) pressure of cold-producing medium of being discharged by pressure release in helical-lobe compressor 11 lifting step 1 is to exceeding storage tank 9 pressure; 3) by the cold-producing medium after pressure-raising stored in storage tank 9.When refrigeration system needs supplementary cryogen, also comprise step 4: the cold-producing medium in storage tank in step 39 is supplemented to refrigeration system.
Embodiment 2
As shown in Figure 2, ethylene refrigeration system refrigerant recovery system, comprise first order inlet buffer 2.1, second level inlet buffer 2.2, ethylene compressor 101, ethylene compressor 101 connects first order inlet buffer 2.1, second level inlet buffer 2.2, and first order inlet buffer 2.1, second level inlet buffer 2.2 connect flare system 5 respectively by safety valve system 3, pressure-regulating valve system 4.
First order inlet buffer 2.1, second level inlet buffer 2.2 are respectively by respective suction line 6 connecting screw rod compressor 11, helical-lobe compressor 11 connects storage tank 9 by outlet line 10, suction line 6 and outlet line 10 are equipped with control valve, the suction line 6 of two-stage surge tank is connected by importing and exporting cross-line 8 respectively with between outlet line 10, imports and exports cross-line 8 and is provided with control valve.The suction line 6 of two-stage surge tank is associated with pressure-regulating valve system 4, safety valve system 3 (pressure signal line of second level inlet buffer omits) respectively by pressure signal line 7, pressure signal line 7 is arranged pressure-regulating valve and control valve.
The unlatching of two-stage surge tank can adopt automatic mode, also can adopt manually, and the artificial pressure condition by observing surge tank 2 is selected to open.First order inlet buffer 2.1 setup pressure value is 0.022MPaG ~ 1.102MPaG, can select 1.0MPaG, and second level inlet buffer 2.2 setup pressure value is 0.616MPaG ~ 1.102MPaG, can select 1.0MPaG.
When first order inlet buffer 2.1 pressure is more than 1.0MPaG, first order inlet buffer 2.1 is opened, and ethylene refrigerant enters helical-lobe compressor 11 along corresponding suction line 6, and pressure-raising, to 2.0MPaG, enters storage tank 9 by outlet line 10.When second level inlet buffer 2.2 pressure exceedes during 1.0MPaG, second level inlet buffer 2.2 is opened, and ethylene refrigerant enters helical-lobe compressor 11 along corresponding suction line 6, and pressure-raising, to 2.0MPaG, enters storage tank 9 by outlet line 10.If in the winter time during the pressure of the pressure of surge tank 203 higher than storage tank 9, open and import and export cross-line 8 and directly enter storage tank 9.
Embodiment 3
As shown in Figure 3, propylene refrigeration system refrigerant recovery system, comprise first order inlet buffer 201, second level inlet buffer 202, propylene compressor 102, propylene compressor 102 connects first order inlet buffer 201, second level inlet buffer 202, third level inlet buffer 203, first order inlet buffer 201, second level inlet buffer 202, third level inlet buffer 203 connects flare system 5 respectively by safety valve system 3, pressure-regulating valve system 4.
First order inlet buffer 201, second level inlet buffer 202, third level inlet buffer 203 is respectively by respective suction line 6 connecting screw rod compressor 11, helical-lobe compressor 11 connects storage tank 9 by outlet line 10, suction line 6 and outlet line 10 are equipped with control valve, the suction line 6 of two-stage surge tank is connected by importing and exporting cross-line 8 respectively with between outlet line 10, imports and exports cross-line 8 and is provided with control valve.The suction line 6 of three grades of surge tanks is associated with pressure-regulating valve system 4, safety valve system 3 respectively by pressure signal line 7.
The unlatching of three grades of surge tanks can adopt automatic mode, also can adopt manually, and the artificial pressure condition by observing surge tank 2 is selected to open.First order inlet buffer 201 setup pressure value is 0.077MPaG ~ 0.7125MPaG, 0.7MPaG can be selected, second level inlet buffer 202 setup pressure value is 0.517MPaG ~ 0.7125MPaG, 0.7MPaG can be selected, third level inlet buffer 203 setup pressure value is 0.814MPaG ~ 1.634MPaG, can select 1.6MPaG
When first order inlet buffer 201 pressure is more than 0.7MPaG, first order inlet buffer 201 is opened, and propylene refrigeration agent enters helical-lobe compressor 11 along corresponding suction line 6, and pressure-raising to 1.0 ~ 1.8MPaG enters storage tank 9 by outlet line 10.When second level inlet buffer 202 pressure exceedes during 0.7MPaG, second level inlet buffer 202 is opened, and propylene refrigeration agent enters helical-lobe compressor 11 along corresponding suction line 6, and pressure-raising to 1.0 ~ 1.8MPaG enters storage tank 9 by outlet line 10.When third level inlet buffer 203 pressure exceedes during 1.6MPaG, third level inlet buffer 203 is opened, and propylene refrigeration agent enters helical-lobe compressor 11 along corresponding suction line 6, and pressure-raising, to 1.8MPaG, enters storage tank 9 by outlet line 10.If in the winter time during the pressure of the pressure of surge tank 203 higher than storage tank 9, open and import and export cross-line 8 and directly enter storage tank 9.
Claims (4)
1. a refrigeration system refrigerant recovery system, comprise surge tank (2), it is characterized in that: described surge tank (2) connects a compressor by suction line (6), compressor connects storage tank (9) by outlet line (10), and suction line (6) and outlet line (10) are equipped with control valve.
2. refrigeration system refrigerant recovery system according to claim 1, it is characterized in that: be connected by importing and exporting cross-line (8) between described suction line (6) with outlet line (10), importing and exporting cross-line (8) and being provided with control valve.
3. refrigeration system refrigerant recovery system according to claim 1, it is characterized in that: described surge tank (2) connects flare system (5) by safety valve system (3), pressure-regulating valve system (4), and described suction line (6) is associated with pressure-regulating valve system (4), safety valve system (3) by pressure signal line (7).
4. refrigeration system refrigerant recovery system according to claim 1, is characterized in that: described compressor is helical-lobe compressor (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420600627.6U CN204100672U (en) | 2014-10-17 | 2014-10-17 | Refrigeration system refrigerant recovery system |
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| CN201420600627.6U CN204100672U (en) | 2014-10-17 | 2014-10-17 | Refrigeration system refrigerant recovery system |
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| CN204100672U true CN204100672U (en) | 2015-01-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266422A (en) * | 2014-10-17 | 2015-01-07 | 山东齐鲁石化工程有限公司 | Refrigerant recovery process and system of refrigerating system |
| CN105944400A (en) * | 2016-06-21 | 2016-09-21 | 北京石油化工工程有限公司 | Separation system and technology for effectively recovering propylene during discharge of non-condensable gas of refrigeration station |
| CN111692786A (en) * | 2020-06-19 | 2020-09-22 | 河南丰之茂环保制冷科技有限公司 | Recycling method and system for circulating refrigerant storage tank |
-
2014
- 2014-10-17 CN CN201420600627.6U patent/CN204100672U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266422A (en) * | 2014-10-17 | 2015-01-07 | 山东齐鲁石化工程有限公司 | Refrigerant recovery process and system of refrigerating system |
| CN105944400A (en) * | 2016-06-21 | 2016-09-21 | 北京石油化工工程有限公司 | Separation system and technology for effectively recovering propylene during discharge of non-condensable gas of refrigeration station |
| CN111692786A (en) * | 2020-06-19 | 2020-09-22 | 河南丰之茂环保制冷科技有限公司 | Recycling method and system for circulating refrigerant storage tank |
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