CN109338077B - Cluster type prestress elongation heating system for quenching heat exchanger - Google Patents
Cluster type prestress elongation heating system for quenching heat exchanger Download PDFInfo
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- CN109338077B CN109338077B CN201811070394.2A CN201811070394A CN109338077B CN 109338077 B CN109338077 B CN 109338077B CN 201811070394 A CN201811070394 A CN 201811070394A CN 109338077 B CN109338077 B CN 109338077B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 130
- 238000010791 quenching Methods 0.000 title claims abstract description 46
- 230000000171 quenching effect Effects 0.000 title abstract description 35
- 238000001816 cooling Methods 0.000 claims description 11
- 230000000875 corresponding effect Effects 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims 2
- 238000000197 pyrolysis Methods 0.000 description 8
- 239000007787 solid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010517 secondary reaction Methods 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides a cluster type prestress elongation heating system for a quenching heat exchanger, which comprises an intelligent centralized control module, a plurality of control modules, a plurality of heating tools and a plurality of elongation measuring devices, wherein the intelligent centralized control module is respectively connected with each control module, each control module is respectively connected with one heating tool and one elongation measuring device, the intelligent centralized control module enables each control module to respectively control the heating tools connected with the intelligent centralized control module to generate heat so as to enable each heat exchange pipe extending into the heating tools to be heated and elongated, and enables each control module to accurately control the heating value of each heating tool according to elongation data fed back by the elongation measuring devices so as to accurately control the elongation of each heat exchange pipe extending into the heating tools, thereby avoiding deviation of prestress elongation of the heat exchange pipes.
Description
Technical Field
The invention relates to the field of manufacturing of quenching heat exchangers, in particular to a cluster type prestress elongation heating system for a quenching heat exchanger.
Background
The quenching heat exchanger can rapidly cool the pyrolysis raw material after high-temperature pyrolysis, thereby preventing secondary reaction, and is one of key equipment of the pyrolysis furnace. On a cracking furnace, a quenching heat exchanger is usually arranged by adopting a single-stage quenching heat exchanger or a multi-stage quenching heat exchanger, wherein the single-stage quenching heat exchanger only has one-stage heat exchange, and the multi-stage quenching heat exchanger has two-stage or even three-stage heat exchange. The single-stage quenching heat exchanger has the characteristics of reduced pressure and simple arrangement; the multi-stage quenching heat exchanger has the characteristics of high ethylene yield, quick secondary reaction stopping and much ultrahigh pressure steam recovery, wherein the secondary quenching heat exchanger is generally a plate quenching heat exchanger and mainly comprises a pyrolysis gas inlet header, a quenching heat exchanger shell, a pyrolysis gas outlet header, a heat exchange tube, a front tube plate, a rear tube plate, a baffle plate, a rising tube joint, a falling tube joint and the like. The quenching heat exchanger shell is internally provided with a plurality of heat exchange tubes, the quenching heat exchanger shell is connected with the heat exchange tubes through front and rear tube plates, high-temperature pyrolysis gas is introduced into the heat exchange tubes during operation, cooling medium is introduced between the heat exchange tubes and the quenching heat exchanger shell, and the rapid cooling of the high-temperature pyrolysis gas is realized under the action of the cooling medium. Under high temperature, the heat exchange tube and the quenching heat exchanger shell expand and stretch, but because the medium temperature difference in the heat exchange tube and the quenching heat exchanger shell is larger, the elongation of the heat exchange tube is larger than that of the quenching heat exchanger shell, and on the other hand, the temperature difference exists among a plurality of heat exchange tubes, so that the connection position between the heat exchange tube and the front tube plate and the rear tube plate easily forms larger temperature stress, thereby causing the heat exchange tube to crack and even causing the heat exchange tube to break.
In order to avoid cracking or breaking of the heat exchange tube, the heat exchange tube needs to be prestressed and stretched to reduce the elongation difference between the heat exchange tube and the quenching heat exchanger shell. The prior method for prestressing and elongating the heat exchange tubes is to blow hot air into all the heat exchange tubes, heat all the heat exchange tubes simultaneously to realize prestressing of the heat exchange tubes, and then weld the heat exchange tubes. The other method is that the inner hole of each heat exchange tube stretches into a heating tool, but the method is only used under the condition that the number of the heat exchange tubes is small, for example, a quenching heat exchanger prestress elongation heating device disclosed in China patent No. CN 102489908A on the 13 th year of 2012 is applied to the prestress elongation heating device of a single heat exchange tube, if the number of the heat exchange tubes which are required to be heated and elongated simultaneously reaches a certain number, such as 60, the temperature among the heat exchange tubes can be mutually interfered, particularly the heat of the heat exchange tubes positioned below can be uploaded upwards to influence the temperature of the heat exchange tubes above, so that when the prestress elongation heating device of the quenching heat exchanger is used for prestress elongation of a plurality of heat exchange tubes simultaneously, the prestress elongation can be deviated.
Disclosure of Invention
The invention aims to solve the technical problem of providing a prestress elongation heating device capable of avoiding deviation of prestress elongation when prestress elongation is carried out on a plurality of heat exchange pipes.
In order to solve the technical problems, the invention provides a cluster-type prestress elongation heating system for a quenching heat exchanger, which comprises an intelligent centralized control module, a plurality of control modules, a plurality of heating tools and a plurality of elongation measuring devices, wherein the intelligent centralized control module is respectively connected with each control module, each control module is respectively connected with one heating tool and one elongation measuring device, the intelligent centralized control module comprises a memory and a processor, wherein the memory stores a computer program, and the computer program can realize the following steps when being executed by the processor:
and enabling each control module to respectively control the heating tools connected with the control modules to generate heat so that each heat exchange tube stretching into the heating tool is heated and stretched, and enabling each control module to accurately control the heating value of each heating tool according to the elongation data fed back by the elongation measuring device so as to accurately control the elongation of each heat exchange tube stretching into the heating tool, wherein the elongation data fed back by the elongation measuring device is positively correlated with the heating value of the heating tool.
Preferably, the heating fixture comprises a heating rod, a fixed sleeve, a fixed plate and a fixed screw, wherein the fixed plate is welded on the fixed sleeve, and the fixed screw is used for adjusting the tightness degree of the fixed sleeve on the heating rod.
Preferably, the end cover plate is welded on the heating rod to avoid the heating rod from extending into the heat exchange tube excessively.
Preferably, the control module comprises an intelligent temperature controller, a solid-state relay, a cooling module and a breaker which are sequentially connected, wherein the intelligent temperature controller outputs corresponding level signals to the solid-state relay according to elongation data fed back by the elongation measuring device, and the solid-state relay controls the on-off of the breaker according to the received level signals, so that the on-off of the cooling module is controlled to control the heating value of the heating tool.
Preferably, the elongation measuring device employs a linear displacement sensor, and a movable brush of the linear displacement sensor is connected to the outside of the heat exchange tube.
Preferably, the intelligent centralized control module comprises a network connection module, and the intelligent centralized control module can be connected with the mobile terminal through the network connection module in a network manner.
Preferably, the intelligent centralized control system further comprises a CRT display connected with the intelligent centralized control module, wherein the CRT display displays temperature data of the heating tool and elongation data of the heat exchange tube in real time.
Preferably, the intelligent centralized control system further comprises a printer connected with the intelligent centralized control module, wherein the printer can print out temperature data of the heating tool and elongation data of the heat exchange tube.
Preferably, the intelligent centralized control system further comprises an alarm system connected with the intelligent centralized control module, and the alarm system alarms when the elongation of the heat exchange tube is abnormal.
Preferably, the heating fixture further comprises an intermediate connecting vehicle, wherein the intermediate connecting vehicle is provided with at least a number of quick-speed sockets of the control module, and the heating fixture and the elongation measuring device are connected with the control module through the intermediate connecting vehicle.
The invention has the following beneficial effects: when the prestress elongation is carried out on the heat exchange tubes, the intelligent centralized control module enables each control module to control the heating tools connected with the intelligent centralized control module to generate heat, and enables each control module to accurately control the heating value of each heating tool according to elongation data fed back by the elongation measuring device, so that the elongation of each heat exchange tube extending into the heating tool can be accurately controlled, and the occurrence of deviation of the prestress elongation of the heat exchange tube is avoided.
Drawings
FIG. 1 is a schematic block diagram of a clustered pre-stressed extension heating system for a quench heat exchanger in pre-stressing and elongating a heat exchange tube;
FIG. 2 is a schematic structural view of a heating fixture;
FIG. 3 is a schematic block diagram of a control module connected to a heating tool;
FIG. 4 is a schematic diagram of the heat exchange tube assembly welded to a quench heat exchanger after pre-stress elongation.
Reference numerals illustrate: 1-an intelligent centralized control module; 2-a control module; 21-an intelligent temperature controller; 22-solid state relay; 23-breaking means; 24-a cooling system; 3-heating the tool; 41-heating rod; 42-fixing the sleeve; 443-fixing plate; 44-fixing screws; 35-end cap plate; 4-elongation measuring device; 5-a heat exchange tube; 6-a mobile terminal; 7-CRT display; 8-a printer; 9-an alarm system; 10-a housing; 11-front tube plate; 12-rear tube plate.
Detailed Description
The invention will be further described with reference to the following examples.
As shown in fig. 1, the cluster type prestress elongation heating system for the quenching heat exchanger comprises an intelligent centralized control part 1 and a plurality of heating modules, the number of the heating modules is equal to that of the heat exchange tubes 5 of the quenching heat exchanger, each heating module comprises a control module 2, a heating tool 3 and an elongation measuring device 4, when the prestress elongation is required to be carried out on each heat exchange tube 5 of the quenching heat exchanger, each heating tool 3 stretches into each heat exchange tube 5, each elongation measuring device 4 is connected with the outside of each heat exchange tube 5, and the heating tools 3 and the elongation measuring devices 4 on the same heat exchange tube 5 are connected with the same control module 2.
The structure of the heating fixture 3 is shown in fig. 2, and comprises a heating rod 41 and a plurality of fixing fixtures, wherein the heating rod 41 is conveniently and rapidly installed inside the heat exchange tube 5 through the plurality of fixing fixtures, specifically, each fixing fixture comprises a fixing sleeve 42, a fixing plate 443 and a fixing screw 44, the fixing plate 443 is welded on the fixing sleeve 42, and the fixing screw 44 is used for adjusting the tightness degree of the fixing sleeve 42 sleeved on the heating rod 41. The fixing screws 44 are tightened by workers, and the fixing sleeve 42 is sleeved on the heating rod 41, so that after the heating fixture 3 stretches into the heat exchange tube 5, the fixing plate 443 can prop against the inner wall of the heat exchange tube 5, and the heating fixture 3 can be stably installed in the heat exchange tube 5; the fixing sleeve 42 can be moved to any position on the heating rod 41 in the axial direction by a worker unscrewing the fixing screw 44, so that the worker can conveniently replace the fixing sleeve 42 welded with the fixing plates 443 of different sizes, and the heating tool 3 can adapt to the heat exchange tubes 5 of different inner diameters. The end cover plate 35 is welded on the heating tool 3, and when the heating tool 3 stretches into the heat exchange tube 5, the end cover plate 35 can be abutted against the tube orifice of the heat exchange tube 5, so that the heating rod 41 stretching into the heat exchange tube 5 is prevented from being bent due to the fact that the heating rod 41 is too long.
As shown in fig. 3, the control module 2 includes an intelligent temperature controller 21, a solid state relay 22, a breaker 23 and a cooling module 24 that are sequentially connected, the intelligent temperature controller is connected with the intelligent centralized control module, the heating tool and the elongation measuring device, the intelligent temperature controller 21 outputs a corresponding level signal to the solid state relay 22 according to the elongation data fed back by the elongation measuring device 4, and the solid state relay 22 controls the on-off of the breaker 23 according to the received level signal, so as to control the on-off of the cooling module 24 to control the heating value of the heating tool 3, for example: if the elongation data fed back by the elongation measuring device 4 is greater than 20cm, the level signal output by the intelligent temperature controller 21 is a high level signal (because the elongation data fed back by the elongation measuring device 4 is positively correlated with the heating value of the heating tool 3, the high level signal means that the heating value of the heating rod 41 is too large), and the solid state relay 22 controls the switch-on of the breaker 23 after receiving the high level signal, so as to control the conduction of the cooling module 24 to reduce the heating value of the heating tool 3; if the elongation data fed back by the elongation measuring device 4 is not greater than 20cm, the level signal output by the intelligent temperature controller 21 is a low level signal (because the elongation data fed back by the elongation measuring device 4 is positively correlated with the heating value of the heating tool 3, the low level signal means that the heating value of the heating rod 41 is not excessively large), and the solid state relay 22 controls the breaker 23 to be turned off after receiving the low level signal, so that the cooling module 24 is controlled to be turned off so as not to reduce the heating value of the heating tool 3.
In this embodiment, the elongation measuring device 4 adopts a linear displacement sensor, and a movable brush of the linear displacement sensor is connected to the outside of the heat exchange tube 5, so that the relative displacement between the linear displacement sensor and the movable brush thereof is the elongation of the heat exchange tube.
In this embodiment, the intelligent centralized control module 1 includes a network connection module (not shown in the figure), and the intelligent centralized control module 1 may be connected to the mobile terminal 6 through the network connection module in a network manner, so that a worker may remotely control the intelligent centralized control module through the mobile terminal 6, where the mobile terminal 6 may be a mobile phone, a tablet computer, or the like.
In this embodiment, the clustered prestress elongation heating system further includes a CRT display 7 connected to the intelligent centralized control module 1, where the intelligent centralized control module 1 can control the CRT display 7 to display temperature data of the heating tool 3 and elongation data of the heat exchange tube 5 in real time.
In this embodiment, the cluster type prestress elongation heating system further comprises a printer 8 connected with the intelligent centralized control module 1, and the intelligent centralized control module 1 can control the printer 8 to print out temperature data of the heating tool 3 and elongation data of the heat exchange tube 5.
In this embodiment, the cluster type prestress elongation heating system further comprises an intermediate connection vehicle (not shown in the figure), the intermediate connection vehicle is provided with a number of quick sockets not less than that of the control modules, and the heating tool 3 and the elongation measuring device 4 are connected with the control modules 2 through the intermediate connection vehicle, so that the connection is more convenient.
In this embodiment, the clustered prestress elongation heating system further includes an alarm system 9 connected to the intelligent centralized control module 1, and when the elongation data of the heat exchange tube 5 is abnormal, the intelligent centralized control module 1 can control the alarm system 9 to alarm to a worker.
Before the cluster type prestress elongation heating system of the embodiment is used for prestress elongation of each heat exchange tube 5 of the quenching heat exchanger, a worker inserts a heating tool 3 from the same end of each heat exchange tube 5, then connects an elongation measuring device 4 outside each heat exchange tube 5 (wherein the heating tool 3 and the elongation measuring device 4 on the same heat exchange tube 5 are connected with the same control module 2), and then directly controls the intelligent centralized control module 1 on the intelligent centralized control module 1 or controls the intelligent centralized control module 1 through a mobile terminal 6 to start the cluster type prestress elongation heating system. After the cluster type prestress elongation heating system is started, the intelligent centralized control module 1 sends control signals to the control modules 2 to enable each control module 2 to control the heating rods 41 connected with the control modules to generate heat, the heat sent by the heating rods 41 is transferred to the corresponding heat exchange tubes 5 to enable the corresponding heat exchange tubes 5 to be elongated by heating, at the moment, the elongation measuring devices 4 connected with the outer parts of the heat exchange tubes 5 detect elongation data of the corresponding heat exchange tubes 5 and feed the elongation data back to the control modules 2 connected with the corresponding heat exchange tubes, each control module 2 precisely controls the heating value of the heating rods 41 connected with the control module according to the feedback elongation data to precisely control the elongation of the corresponding heat exchange tubes 5, and therefore, even though the temperatures among the heat exchange tubes 5 can interfere with each other, the control module 2 can control the elongation of each heat exchange tube 5 according to the feedback elongation data. In the above process, a worker can remotely monitor the temperature data of each heating rod 41 and the elongation data of each heat exchange tube 5 in real time using the mobile terminal 6.
After the elongation of each heat exchange tube 5 is accurately controlled, a worker welds each heat exchange tube 5 to the quenching heat exchanger, and then removes the heating tool 3 and the elongation measuring device 4, so that the prestress elongation of the heat exchange tube 5 on the quenching heat exchanger has no deviation. The quenching heat exchanger after assembly welding is shown in fig. 4, a shell 10 of the quenching heat exchanger is arranged between a front tube plate 11 and a rear tube plate 12, the front end of each heat exchange tube 5 is propped against the front tube plate 11, the rear end extends out of the rear tube plate 12, and high-temperature pyrolysis gas to be cooled is input into the quenching heat exchanger from a part of the heat exchange tube 5, which is close to the front tube plate 11, for cooling.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (9)
1. A clustered prestressed elongation heating system for a quench heat exchanger, characterized by: including intelligent centralized control module, a plurality of heating frock and a plurality of elongation measuring device, each control module is connected respectively to intelligent centralized control module, and every control module connects a heating frock and an elongation measuring device respectively, intelligent centralized control module includes memory and treater, wherein the memory stores computer program, the computer program can realize following step when being carried out by the treater:
Each control module is used for respectively controlling the heating tools connected with the control modules to generate heat so that each heat exchange tube extending into the heating tool is heated and stretched, and each control module is used for precisely controlling the heating value of each heating tool according to the elongation data fed back by the elongation measuring device so as to precisely control the elongation of each heat exchange tube extending into the heating tool and further avoid deviation of the prestress elongation of the heat exchange tube, wherein the elongation data fed back by the elongation measuring device is positively correlated with the heating value of the heating tool;
The control module comprises an intelligent temperature controller, a solid-state relay, a cooling module and a breaker which are sequentially connected, wherein the intelligent temperature controller outputs corresponding level signals to the solid-state relay according to elongation data fed back by the elongation measuring device, and the solid-state relay controls the on-off of the breaker according to the received level signals, so that the on-off of the cooling module is controlled to control the heating value of the heating tool.
2. The clustered prestressed elongating heating system for quench exchanger of claim 1, wherein: the heating tool comprises a heating rod, a fixed sleeve, a fixed plate and a fixed screw, wherein the fixed plate is welded on the fixed sleeve, and the fixed screw is used for adjusting the tightness degree of the fixed sleeve on the heating rod.
3. A clustered prestressed elongating heating system for quench exchanger according to claim 2, characterized in that: and the end cover plate is welded on the heating rod to prevent the heating rod from excessively extending into the heat exchange tube.
4. The clustered prestressed elongating heating system for quench exchanger of claim 1, wherein: the elongation measuring device adopts a linear displacement sensor, and a movable electric brush of the linear displacement sensor is connected with the outside of the heat exchange tube.
5. The clustered prestressed elongating heating system for quench exchanger of claim 1, wherein: the intelligent centralized control module comprises a network connection module, and the intelligent centralized control module can be connected with the mobile terminal through the network connection module in a network manner.
6. The clustered prestressed elongating heating system for quench exchanger of claim 1, wherein: the intelligent heating tool further comprises a CRT display connected with the intelligent centralized control module, wherein the CRT display displays temperature data of the heating tool and elongation data of the heat exchange tube in real time.
7. The clustered prestressed elongating heating system for quench exchanger of claim 1, wherein: the intelligent heating tool also comprises a printer connected with the intelligent centralized control module, wherein the printer can print out temperature data of the heating tool and elongation data of the heat exchange tube.
8. The clustered prestressed elongating heating system for quench exchanger of claim 1, wherein: the intelligent heat exchange tube also comprises an alarm system connected with the intelligent centralized control module, wherein the alarm system alarms when the elongation of the heat exchange tube is abnormal.
9. The clustered prestressed elongating heating system for quench exchanger of claim 1, wherein: the heating tool and the elongation measuring device are connected with the control module through the intermediate connecting vehicle.
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| CN201811070394.2A CN109338077B (en) | 2018-09-13 | 2018-09-13 | Cluster type prestress elongation heating system for quenching heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811070394.2A CN109338077B (en) | 2018-09-13 | 2018-09-13 | Cluster type prestress elongation heating system for quenching heat exchanger |
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| CN109338077A CN109338077A (en) | 2019-02-15 |
| CN109338077B true CN109338077B (en) | 2024-07-02 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19632608A1 (en) * | 1996-08-13 | 1998-02-19 | Duerr Systems Gmbh | Control system |
| CN102489908A (en) * | 2011-12-31 | 2012-06-13 | 茂名重力石化机械制造有限公司 | Prestressed elongation heating device for rapid cooling heat exchanger |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3377950B1 (en) * | 2015-11-16 | 2019-08-14 | ABB Schweiz AG | Configuring process modules for operation in plants |
| KR101870976B1 (en) * | 2016-04-04 | 2018-07-23 | (주)화인 | Temperature control module for heat jacket |
| KR101872355B1 (en) * | 2016-04-04 | 2018-06-28 | (주)화인 | Heat jacket module for temperature control and the method for operation thereof |
-
2018
- 2018-09-13 CN CN201811070394.2A patent/CN109338077B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19632608A1 (en) * | 1996-08-13 | 1998-02-19 | Duerr Systems Gmbh | Control system |
| CN102489908A (en) * | 2011-12-31 | 2012-06-13 | 茂名重力石化机械制造有限公司 | Prestressed elongation heating device for rapid cooling heat exchanger |
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