CN212687929U - System for providing cold energy for propane dehydrogenation device by using low-temperature propane - Google Patents
System for providing cold energy for propane dehydrogenation device by using low-temperature propane Download PDFInfo
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- CN212687929U CN212687929U CN202020817727.XU CN202020817727U CN212687929U CN 212687929 U CN212687929 U CN 212687929U CN 202020817727 U CN202020817727 U CN 202020817727U CN 212687929 U CN212687929 U CN 212687929U
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Abstract
The utility model provides an utilize low temperature propane to provide system of cold volume for propane dehydrogenation device relates to propane dehydrogenation device technical field, has solved among the prior art propylene refrigeration compressor load higher, especially the technical problem of the potential safety hazard that propylene refrigeration compressor at different levels outlet pressure height brought in summer. The system comprises a cold box, a propane pipeline and a propylene freezing pipeline, wherein the cold box is connected with the propane pipeline and the propylene freezing pipeline, and the flow directions of the propylene freezing pipeline and the propylene freezing pipeline in the cold box are opposite; the junction of the propane pipeline and the propylene freezing pipeline and the cold box is provided with a branch valve, and the propane pipeline and the propylene freezing pipeline are communicated or blocked with the cold box through the branch valve, so that the cold box is switched into the propylene freezing pipeline through the propane pipeline, or the cold box is switched into the propane pipeline through the propylene freezing pipeline. A propane pipeline is introduced into the propylene freezing material pipeline, low-temperature propane is introduced into a cold box in the propylene freezing material pipeline, and the load of a compressor of the cold box is reduced by using the cold energy of the low-temperature propane.
Description
Technical Field
The utility model relates to a propane dehydrogenation device's technical field especially relates to an utilize system that low temperature propane provided cold volume for propane dehydrogenation device.
Background
A60 ten thousand ton propylene production device by Propane Dehydrogenation (PDH) annually uses propane as a raw material, and produces polymerization grade superior propylene products through units such as a reaction unit, a compression unit, a product recovery unit, product refining and refrigeration, a torch recovery system, a PSA unit, a middle tank area and the like, and final products are stored in a normal temperature propylene spherical tank and a low temperature propylene storage tank according to requirements and are transported out for sale according to the requirements. Raw material propane is low-temperature propane conveyed by an external pipeline and enters a supply device for supplying normal-temperature propane after heat exchange of our company.
The product propylene can be subjected to heat exchange through a cold box system according to the requirement, is cooled to be low-temperature propylene and then is stored in a low-temperature propylene storage tank, and is conveyed after being reheated to normal-temperature propylene when being conveyed to the outside. If the product does not need to be frozen and fed into the low-temperature propylene storage tank for storage, the freezing material pipeline of the cold box is temporarily not used. The propylene refrigeration compressor of the prior device has higher load, particularly the pressure of each stage of outlet of the propylene refrigeration compressor in summer is high, and great challenge is brought to the long-period stable operation of the device.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an one of them purpose provides one kind and utilizes low temperature propane cold volume to provide the device of cold volume for propane dehydrogenation, has solved among the prior art propylene refrigeration compressor load higher, especially the technical problem of the potential safety hazard that propylene refrigeration compressor at different levels export pressure height brought in summer. The utility model discloses preferred technical scheme can reach a great deal of beneficial technological effect, specifically see the following explanation.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the utility model discloses a system for utilize low temperature propane to provide cold volume for propane dehydrogenation device, including cold box, propane pipeline and the freezing material pipeline of propylene, the cold box is connected with propane pipeline and the freezing material pipeline of propylene, and the flow direction of freezing material pipeline of propylene and propane pipeline inside the cold box is opposite; the junction of the propane pipeline and the propylene freezing pipeline and the cold box is provided with a branch valve, and the propane pipeline and the propylene freezing pipeline are communicated or blocked with the cold box through the branch valve, so that the cold box is switched into the propylene freezing pipeline through the propane pipeline, or the cold box is switched into the propane pipeline through the propylene freezing pipeline.
According to a further preferred technical solution, the cold box comprises a hot end and a cold end, the temperature of the hot end is higher than that of the cold end; the propylene freezing pipeline comprises a normal-temperature propylene pipe and a low-temperature propylene pipeline, the propane pipeline comprises a low-temperature propane pipe and a normal-temperature propane pipe, the normal-temperature propylene pipe and the normal-temperature propane pipe are connected with a hot end of the cold box, the low-temperature propane pipe and the low-temperature propylene pipeline are connected with a cold end of the cold box, and branch valves are arranged on the normal-temperature propylene pipe, the low-temperature propylene pipeline, the low-temperature propane pipe and the normal-temperature propane pipe.
According to a further preferred technical scheme, the system for providing cold energy for the propane dehydrogenation device by utilizing low-temperature propane further comprises a cold box valve and a pressure release valve, wherein the cold box valve is positioned at the cold end and the hot end of the cold box, the pressure release valve is positioned on a pipeline between the cold box valve and the branch valve, and the pressure release valve can discharge materials in the pipeline between the cold box valve and the branch valve.
According to a further preferred technical scheme, one end of the pressure release valve is connected with a pipeline between the cold box valve and the branch valve, and the other end of the pressure release valve is connected with a ground torch.
According to a further preferable technical scheme, the system for providing cold energy for the propane dehydrogenation device by using low-temperature propane further comprises a deethanizer pipeline, the deethanizer pipeline is connected with a cold port end of a cold box, when the cold box is switched to a propylene freezing pipeline from a propane pipeline, propane in the cold box is replaced by propylene, and mixed liquid of the propane and the propylene is discharged into the deethanizer pipeline when the cold box pipeline is switched.
According to a further preferable technical scheme, the joint of the deethanizer pipeline and the cold box is positioned between the branch valves on the low-temperature propylene pipeline and the low-temperature propane pipe and the cold box valve at the cold end of the cold box, and the joint of the deethanizer pipeline and the cold box is provided with the branch valve.
According to a further preferred technical scheme, the system for providing cold energy for the propane dehydrogenation device by using low-temperature propane further comprises a product gas dryer pipeline, the product gas dryer pipeline is connected with the hot port end of the cold box, when the cold box is provided with a propylene freezing pipeline and is switched to a propane pipeline, propylene in the cold box is replaced by propane, and when the cold box pipeline is switched, a mixed liquid of the propylene and the propane is discharged into the product gas dryer pipeline.
According to a further preferred technical scheme, the connection position of the product gas dryer pipeline and the cold box is positioned between a branch valve on the normal-temperature propylene pipe and the normal-temperature propane pipe and a cold box valve at the hot end of the cold box, and the product gas dryer pipeline is provided with the branch valve.
According to a further preferred technical scheme, the system for providing cold energy for the propane dehydrogenation device by using low-temperature propane further comprises a check valve, and the check valve is positioned between a cold box valve at the hot end of the cold box and a product gas dryer pipeline as well as an upper branch valve of a normal-temperature propane pipe.
According to a further preferred technical scheme, the system for providing cold energy for the propane dehydrogenation device by utilizing the low-temperature propane further comprises a flowmeter, wherein the flowmeter is positioned on a pipeline between the cold box and a valve of the cold box, so that the flow of the propylene or the propane in the cold box is regulated by the flowmeter.
The utility model provides an utilize low temperature propane to provide the system of cold volume for propane dehydrogenation device has following beneficial technological effect at least:
utilize low temperature propane to freeze the system that the material pipe line introduced propane pipeline at current propylene for propane dehydrogenation device provides cold volume, and introduce propylene through the propane pipeline and freeze the refrigerator in the material pipeline with low temperature propane, and then utilize the cold volume in the low temperature propane to reduce the load of propylene refrigeration refrigerator compressor to low temperature propane is also become normal atmospheric temperature propane through propylene refrigeration refrigerator, then to propane vaporizer feeding, and then the realization utilizes the cold volume in the low temperature propane to provide cold volume for propane dehydrogenation device. The quality and the working procedure of the product are not influenced after the modified pipeline is put into use. The operation load of the propylene refrigeration compressor is reduced, the steam consumption of the steam turbine is saved, and the outlet pressure of the propylene refrigeration compressor is reduced.
The utility model relates to an optimal technical scheme can effectively utilize the cold box to be the produced propylene propane mixture of material replacement when propylene freezes the material pipeline by propane pipeline switching by the propane pipeline through setting up the deethanization tower pipeline, both prevents the cluster material, guarantees that low temperature stores propylene and is greater than 99.6% polymerization level premium grade propylene for propylene content, can also avoid the waste of propylene and propane.
In a further preferred scheme, by arranging the product air dryer pipeline, a propylene-propane mixture generated by material replacement can be obtained when the propylene freezing pipeline is switched to the propane pipeline by using the cold box, and the feeding of the propane vaporizer can be ensured to be normal-temperature propane with the propane content of more than 99.5%.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art cryogenic propane heat exchanger for normal temperature propane and feed propane vaporizer;
FIG. 2 is a schematic illustration of the prior art freezing and storage of normal temperature propylene produced after dehydrogenation of propane;
FIG. 3 is a schematic diagram of a modification of a preferred embodiment of the present invention;
FIG. 4 is a schematic view of a preferred embodiment of the present invention;
fig. 5 is a schematic view of a second preferred embodiment of the present invention.
In the figure: 1-a cold box; 2-a branch valve; 3-normal temperature propylene pipe; 4-a low temperature propylene line; 5-low temperature propane tube; 6-normal temperature propane tube; 7-a cold box valve; 8-a pressure relief valve; 9-deethanizer line; 10-product air dryer line; 11-a non-return valve; 12-a flow meter; 13-a deethanizer; 14-propane heat exchanger; a 15-propane gasifier; 16-low temperature propylene storage tanks; 17-a low temperature propane tank; 18-product gas dryer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 3 to 5, a system for providing cold energy to a propane dehydrogenation apparatus using low-temperature propane as a preferred embodiment of the present invention includes a cold box 1, a propane pipeline, and a propylene freezing pipeline, wherein the cold box 1 is connected to the propane pipeline and the propylene freezing pipeline, and the flow directions of the propylene freezing pipeline and the propane pipeline inside the cold box 1 are opposite. Propane pipeline and the freezing material pipeline of propylene all are provided with branch valve 2 with cold box 1 junction, and propane pipeline and the freezing material pipeline of propylene pass through branch valve 2 and cold box 1 intercommunication or block to make cold box 1 freeze the material pipeline by the propane pipeline switching into propylene, perhaps, cold box 1 freezes the material pipeline by propylene and switches into the propane pipeline.
In the prior art, the propylene from the tower is normal temperature propylene at 20 ℃, so the product propylene needs to be cooled to-45 ℃ before entering the low-temperature propylene storage tank 16. Referring to fig. 2, in the prior art, normal temperature propylene is introduced into the cold box 1 to cool the normal temperature propylene, so as to meet the requirement of the low temperature propylene storage tank 16. Because the propylene produced after propane dehydrogenation is not all required to be stored at low temperature, the pipeline for freezing normal-temperature propylene in the prior art is stopped, and the utilization rate of the cold box 1 is reduced. The low temperature propane in the low temperature propane tank 17 in the prior art is-45 ℃. Since the temperature of the low-temperature propane fed into the propane vaporizer 15 is 15 ℃, it is necessary to heat the low-temperature propane when feeding the low-temperature propane into the propane vaporizer. Specifically, referring to fig. 2, in the prior art, low temperature propane needs to be heated by a heat exchanger before entering a propane vaporizer.
Referring to fig. 3, the utility model discloses an add the pipeline, introduce low temperature propane and freeze the material pipeline and freeze the cold box 1 that the material pipeline was frozen for propylene and provide cold volume, not only can utilize cold volume in the low temperature propane to reduce the load of compressor in the cold box 1, practice thrift steam, can also improve the equipment utilization ratio of cold box 1 in the freezing pipeline of propylene, and then can effectively reduce the production cost.
It should be noted that, in the prior art, the cold box 1 is mainly used to provide cold for the product gas propylene, and the cold provided for the product gas occupies more than 80% of the load of the cold box, and in the process of normal temperature propylene refrigeration, the more heat the cold box 1 absorbs, the larger the load of the refrigeration compressor of the cold box 1 is, and the more steam is consumed. In the prior art, the load of a refrigeration compressor of the cold box 1 is increased by absorbing heat in normal-temperature propylene in the cold box 1. The utility model discloses an improve, through introducing low temperature propane to introducing in cold box 1, and then utilize low temperature propane to provide cold volume for cold box 1, reach the purpose that reduces the compressor load. And just apply cold box 1 before improving when needs low temperature storage propylene, so cold box 1's utilization ratio is not high, the utility model discloses an improve, increased cold box 1's usage for cold box 1 can be in propylene refrigeration and propane heat exchange uses in turn in two processes of rising temperature, and then realizes that cold box 1 does not shut down, improves cold box 1's utilization ratio.
Referring to fig. 4 or 5, as a further preferred embodiment, the cold box 1 includes a hot end and a cold end, the hot end having a higher temperature than the cold end. The propylene freezing pipeline comprises a normal-temperature propylene pipe 3 and a low-temperature propylene pipe 4, the propane pipe comprises a low-temperature propane pipe 5 and a normal-temperature propane pipe 6, the normal-temperature propylene pipe 3 and the normal-temperature propane pipe 6 are connected with the hot end of the cold box 1, the low-temperature propane pipe 5 and the low-temperature propylene pipe 4 are connected with the cold end of the cold box 1, and the normal-temperature propylene pipe 3, the low-temperature propylene pipe 4, the low-temperature propane pipe 5 and the normal-temperature propane pipe 6 are all provided with branch valves 2.
Referring to fig. 4, the low-temperature propane enters the inlet of the propane heat exchanger 14 to be flapped, and is laid to the cold end of the cold box 1 along the pipe gallery of the device and is connected with the cold end of the cold box 1. Further, the product propylene enters an inlet tap of the cold box 1, and a laying pipeline is connected with a feed pipeline of the propane vaporizer.
Referring to fig. 4 and 5, as a preferred embodiment of the present invention, the system for providing cold energy for propane dehydrogenation device by using low temperature propane further includes a cold box valve 7 and a pressure release valve 8, the cold box valve 7 is located at the cold end and the hot end of the cold box 1, the pressure release valve 8 is located on the pipeline between the cold box valve 7 and the branch valve 2, and the pressure release valve 8 can discharge the material in the pipeline between the cold box valve 7 and the branch valve 2.
Specifically, through setting up cold box valve 7 and relief valve 8 for the pipeline between each branch valve 2 and the cold box valve 7 can form independent space when trading the line, and then when trading the line, can realize through adjusting branch valve 2 and cold box valve 7 that liquid discharges in the pipeline, can prevent the cluster material, material replacement time when also can shortening the trade line.
As a preferred embodiment of the utility model, the one end of relief valve 8 and the pipeline connection between cold box valve 7 and the branch valve 2, the other end is connected with ground torch. The decompression valve 8 is connected with the ground torch, can enough realize the emission of material in the pipeline, can also make the material that is discharged can obtain abundant burning to the ground torch through the pressure release, and then prevent the polluted environment.
Referring to fig. 4 and 5, as a preferred embodiment of the present invention, the system for providing cold energy to the propane dehydrogenation device by using low-temperature propane further includes a deethanizer pipeline 9, the deethanizer pipeline 9 is connected to the cold port of the cold box 1, when the cold box 1 is switched from the propane pipeline to the propylene freezing pipeline, propane and propylene in the cold box 1 are replaced, and when the cold box 1 is switched from the pipeline, the mixed liquid of propane and propylene is discharged into the deethanizer pipeline 9.
Referring to fig. 4 and 5, as a preferred embodiment of the present invention, the junction of the deethanizer pipeline 9 and the cold box 1 is located between the branch valve 2 on the low-temperature propylene pipeline 4 and the low-temperature propane pipe 5 and the cold box valve 7 at the cold end of the cold box 1, and the junction of the deethanizer pipeline 9 and the cold box 1 is provided with the branch valve 2.
In the above preferred embodiment, the deethanizer pipeline 9 is newly added, so that the mixed material generated by replacing propane with propylene when the line of the cold box 1 is changed can enter the deethanizer 13 in the propane dehydrogenation device, and then enter the rectification system of the propane dehydrogenation device. When the residual propane in the cold box 1 and the pipeline is completely replaced and the content of the propylene is more than or equal to 99.6 percent, the working procedure of freezing and storing the propylene is carried out by adjusting each branch valve 2.
Referring to fig. 4 and 5, as a preferred embodiment of the present invention, the system for providing cold energy to the propane dehydrogenation device by using low-temperature propane further includes a product gas dryer line 10, the product gas dryer line 10 is connected to the hot port of the cold box 1, when the cold box 1 has a propylene freezing line to be switched to a propane line, propylene in the cold box is replaced with propane, and when the cold box 1 is switched to a pipeline, a mixed liquid of propylene and propane is discharged into the product gas dryer line 10.
As a preferred embodiment of the present invention, the junction between the product air dryer pipeline 10 and the cold box 1 is located between the branch valve 2 on the normal temperature propylene pipe 3 and the normal temperature propane pipe 6 and the cold box valve 7 at the hot end of the cold box 1, and the branch valve 2 is provided on the product air dryer pipeline 10.
In the preferred embodiment, the product gas dryer line 10 is added, so that when the cold box 1 is changed, the mixed material generated by replacing propylene with propane can enter the product gas dryer line 10 and further enter the rectification system of the propane dehydrogenation device. When the propane content is greater than or equal to 99.5% after the cold box 1 and the propylene in the pipeline are completely replaced, normal propane feeding is carried out by adjusting each branch valve 2.
As a preferred embodiment of the present invention, the system for providing cold energy to the propane dehydrogenation device by using low-temperature propane further comprises a check valve 11, wherein the check valve 11 is located between the cold box valve 7 at the hot end of the cold box 1 and the branch valve 2 on the product gas dryer pipeline 10 and the normal-temperature propane pipe 6. The preferred embodiment described above can effectively prevent the liquid in the pipe from flowing in the reverse direction by providing the check valve 11.
Referring to fig. 5, as a preferred embodiment of the present invention, the system for providing cold energy to the propane dehydrogenation unit by using low-temperature propane further includes a flow meter 12, and the flow meter 12 is located on the pipeline between the cold box 1 and the cold box valve 7 to adjust the flow rate of propylene or propane in the cold box 1 through the flow meter 12.
In the preferred embodiment described above, the flow meter 12 is located on the piping between the cold box 1 and the cold box valve 7, so that the flow meter 12 can be used for both the propylene freezing process and the low-temperature propane refrigeration utilization process. Specifically, the flowmeter 12 is additionally arranged, so that the material flow in the pipeline can be adjusted through the flowmeter 12. Specifically, the system when utilizing low temperature propane cold volume, according to the flow of material in the 1 export propane temperature regulation pipeline of cold box, guarantee that low temperature propane reaches the design and anticipates the target after the heat transfer, guarantee device steady operation.
Referring to fig. 5, the steps of pipeline switching of the system cold box 1 for providing cold energy to the propane dehydrogenation unit by using low-temperature propane in a preferred embodiment are as follows:
firstly, the cold box 1 is switched into a propylene freezing pipeline by a propane pipeline
S1, confirming that propane exists in the pipeline, and stopping low-temperature propane; the positive and negative chambers of the FV-50802 flow meter have switched to completion;
s2, closing 7#, 8#, 9#, 11# valves, and relieving pressure to a torch by short joints among the valves;
s3, inverting the blind plate at the 11# valve by the spacer ring after the chemical treatment is qualified, and inverting the blind plate at the 11# valve by the spacer ring after the chemical treatment is qualified;
s4, closing valves 2#, 3# and 4#, relieving pressure to a torch by a short joint between the valves, removing a blind plate at the valve 3# and enabling a pipeline valve of the propylene-cold box-deethanizer to be on line;
s5, controlling the flow rate of the propylene substitution propane by an FV50802 flow meter, and accumulating the flow rate to 4 tons;
and S6, sampling and analyzing, wherein the result is qualified. And (4) stopping replacement, closing the 7#, 8#, 10#, 11# valves, and releasing the pressure of the short section to a torch.
The pipeline from the S7 # valve to the low-temperature tank is opened;
and S8, inverting the spacer ring at the blind plate at the 7# valve and inverting the blind plate at the spacer ring at the 10# valve after the chemical treatment is qualified.
Before replacement, the deethanizer hand valve at the FV-50204 flowmeter was confirmed to be closed, preventing cross-feed. Before the blind plate is turned over, the 7# valve confirms that the valve is opened to the low-temperature tank pipeline, and the pipeline pressure is the low-temperature tank pressure.
Secondly, the cooling box 1 is switched into a propane pipeline from a propylene freezing pipeline
S1, confirming that propylene is in the pipeline, and stopping propylene refrigeration. The positive chamber and the negative chamber of the FV-50802 flowmeter are switched, and the valves in the flow charts 2#, 6#, 9#, and 11# are confirmed to be in a blind plate state;
s2, closing 7#, 8#, 9#, 11# valves, and relieving pressure to a torch by short joints among the valves;
s3, inverting the blind plate at the position of the 7# valve with the spacer ring after the chemical treatment is qualified; the blind plate at the 11# valve is inverted to form a spacer ring; closing the 2#, 3#, 4# valves, and releasing pressure to a torch by a short joint between the valves;
s4, after the chemical treatment is qualified, the blind plate at the 2# valve is inverted to form the spacer ring
A blind plate is arranged at the S5 and 3# valves; the 1# valve is closed, the blind plate at the 6# valve is removed, and the 5# and 6# valves are opened; the low temperature propane-cold box-product gas dryer pipeline valve is on-line;
s6, controlling the flow rate of propane substituted propylene by an FV50802 flow meter, and accumulating the flow rate to 4 tons;
s7, sampling and analyzing, stopping replacement after the result is qualified, closing the 5# and 6# valves, and releasing pressure to a torch by using the short section;
s8, adding a blind plate at the 6# valve after the chemical treatment is qualified; the No. 1 valve is opened, and the low-temperature propane pipeline is used.
It should be noted that, after the replacement is finished, the 5# and 6# valves must be closed first, and then the 1# valve is opened, otherwise, the materials are mixed. XV-10108, if closed, the cryogenic propane cannot enter the propane vaporizer. If the device is in emergency stop, the FV50802 flow meter is closed in time. The spare filter on the cold box side is provided with a blind plate to prevent the material from mixing.
It should be further noted that, the valves 1#, 5#, 3#, 7#, 11#, and 9# in fig. 5 are branch valves 2; the 4# and 8# valves are cold box valves 7.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A system for providing cold energy for a propane dehydrogenation device by using low-temperature propane is characterized by comprising a cold box (1), a propane pipeline and a propylene freezing material pipeline, wherein the cold box (1) is connected with the propane pipeline and the propylene freezing material pipeline, and the flow directions of the propylene freezing material pipeline and the propane pipeline in the cold box (1) are opposite;
the propane pipeline with the freezing pipeline of propylene expects the pipeline with cold box (1) junction all is provided with branch valve (2), and the propane pipeline with the freezing pipeline of propylene passes through branch valve (2) with cold box (1) intercommunication or block to make cold box (1) by the propane pipeline switches into the freezing pipeline of propylene, perhaps, cold box (1) by the freezing pipeline of propylene switches into the propane pipeline.
2. The system for providing cold for the propane dehydrogenation unit by using low-temperature propane according to claim 1, wherein the cold box (1) comprises a hot end and a cold end, and the temperature of the hot end is higher than that of the cold end;
the propylene freezes the pipeline and includes normal atmospheric temperature propylene pipe (3) and low temperature propylene pipeline (4), the propane pipeline includes low temperature propane pipe (5) and normal atmospheric temperature propane pipe (6), normal atmospheric temperature propylene pipe (3) with normal atmospheric temperature propane pipe (6) with the hot-spot end of cold box (1) is connected, low temperature propane pipe (5) with low temperature propylene pipeline (4) with the cold-spot end of cold box (1) is connected, just all be provided with branch valve (2) on normal atmospheric temperature propylene pipe (3), low temperature propylene pipeline (4), low temperature propane pipe (5) and the normal atmospheric temperature propane pipe (6).
3. The system for providing cold energy for the propane dehydrogenation device by using low-temperature propane according to claim 2, further comprising a cold box valve (7) and a pressure release valve (8), wherein the cold box valve (7) is positioned at the cold end and the hot end of the cold box (1), the pressure release valve (8) is positioned on the pipeline between the cold box valve (7) and the branch valve (2), and the pressure release valve (8) can discharge materials in the pipeline between the cold box valve (7) and the branch valve (2).
4. The system for providing cold energy for a propane dehydrogenation unit by using low-temperature propane according to claim 3, characterized in that one end of the pressure relief valve (8) is connected with the pipeline between the cold box valve (7) and the branch valve (2), and the other end is connected with a ground torch.
5. The system for providing cold energy for the propane dehydrogenation device by using low-temperature propane according to claim 3, further comprising a deethanizer line (9), wherein the deethanizer line (9) is connected with the cold end of the cold box (1), when the cold box (1) is switched from the propane line to the propylene freeze material line, propane in the cold box (1) is replaced by propylene, and when the cold box (1) is switched, the mixed liquid of propane and propylene is discharged into the deethanizer line (9).
6. The system for providing cold energy for the propane dehydrogenation device by using low-temperature propane according to claim 5, wherein the joint of the deethanizer pipeline (9) and the cold box (1) is positioned between the branch valves (2) on the low-temperature propylene pipeline (4) and the low-temperature propane pipe (5) and the cold box valve (7) at the cold end of the cold box (1), and the joint of the deethanizer pipeline (9) and the cold box (1) is provided with the branch valve (2).
7. The system for providing cold energy for the propane dehydrogenation unit by using low-temperature propane according to any one of claims 3 to 6, characterized by further comprising a product gas dryer pipeline (10), wherein the product gas dryer pipeline (10) is connected with the hot port end of the cold box (1), when the propylene freezing pipeline of the cold box (1) is switched to the propane pipeline, propylene in the cold box (1) is replaced by propane, and when the pipeline of the cold box (1) is switched, the mixed liquid of propylene and propane is discharged into the product gas dryer pipeline (10).
8. The system for providing cold energy for the propane dehydrogenation device by using low-temperature propane according to claim 7, wherein the connection between the product gas dryer pipeline (10) and the cold box (1) is located between the branch valves (2) on the normal-temperature propylene pipe (3) and the normal-temperature propane pipe (6) and the cold box valve (7) at the hot end of the cold box (1), and the branch valve (2) is arranged on the product gas dryer pipeline (10).
9. The system for providing cold energy for the propane dehydrogenation unit by using low-temperature propane according to claim 8, further comprising a check valve (11), wherein the check valve (11) is positioned between the cold box valve (7) at the hot end of the cold box (1), the product gas dryer line (10) and the branch valve (2) on the normal-temperature propane pipe (6).
10. The system for providing refrigeration capacity for a propane dehydrogenation unit using low temperature propane according to claim 3, further comprising a flow meter (12), wherein the flow meter (12) is located on the pipeline between the cold box (1) and the cold box valve (7) to regulate the flow of propylene or propane in the cold box (1) through the flow meter (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020817727.XU CN212687929U (en) | 2020-05-15 | 2020-05-15 | System for providing cold energy for propane dehydrogenation device by using low-temperature propane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020817727.XU CN212687929U (en) | 2020-05-15 | 2020-05-15 | System for providing cold energy for propane dehydrogenation device by using low-temperature propane |
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| CN212687929U true CN212687929U (en) | 2021-03-12 |
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| CN202020817727.XU Active CN212687929U (en) | 2020-05-15 | 2020-05-15 | System for providing cold energy for propane dehydrogenation device by using low-temperature propane |
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