CN110160377A - Vertical shell-and-tube heat exchanger - Google Patents

Vertical shell-and-tube heat exchanger Download PDF

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Publication number
CN110160377A
CN110160377A CN201910576854.7A CN201910576854A CN110160377A CN 110160377 A CN110160377 A CN 110160377A CN 201910576854 A CN201910576854 A CN 201910576854A CN 110160377 A CN110160377 A CN 110160377A
Authority
CN
China
Prior art keywords
tube
perforated plate
shell
heat exchanger
central tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910576854.7A
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Chinese (zh)
Inventor
徐志刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changzhou Ruikai Chemical Equipment Co Ltd
Original Assignee
Changzhou Ruikai Chemical Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Changzhou Ruikai Chemical Equipment Co Ltd filed Critical Changzhou Ruikai Chemical Equipment Co Ltd
Priority to CN201910576854.7A priority Critical patent/CN110160377A/en
Publication of CN110160377A publication Critical patent/CN110160377A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/106Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02Header boxes; End plates
    • F28F9/0219Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • F28F2009/222Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
    • F28F2009/224Longitudinal partitions

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The present invention relates to a kind of vertical shell-and-tube heat exchangers, including outer housing and the heat exchanger for being built in outer housing;The outer housing includes pressure hull, upper cover and lower head;The heat exchanger includes shell, upper perforated plate, lower perforated plate, tube bank, outer tube, deflector and central tube;The central tube lower end passes through the centre bore of upper cover, upper perforated plate to close to down tube Board position;The outer tube is socketed in central tube outer upper and forms exit passageway between the pipe outer wall of center, and the central tube is connected with upper cover, upper perforated plate sealing respectively by outer tube;The outer sleeve upper tube wall is connected by forming undergauge structure with the sealing of central tube upper end tube wall;Positioned at upper cover outer fix, the outer tube is exported equipped with thermal medium;The lower perforated plate is fixedly linked with shell, is connected between the upper perforated plate and shell by the way that packing box seal structure is arranged;The method can significantly improve the reliabilities of equipment, ensure that the economy of equipment, improve productivity effect.

Description

Vertical shell-and-tube heat exchanger
Technical field
The invention belongs to chemical industry and technical field of petrochemical industry, and it is swollen with sliding tube sheet and inside that the invention proposes one kind The vertical shell-and-tube heat exchanger of swollen section, especially suitable for heating low temperature process material using high temperature super heated steam, in particular for In the dehydrogenation reaction technique of aromatic hydrocarbons.
Background technique
In chemical industry and petrochemical industry, heat exchanger using very extensive, be that indispensable common technique is set It is standby, in daily life and it is seen everywhere.According to statistics, heat exchanger accounts for the 40% of equipment sum in oil refining and chemical plant installations Left and right, investment account for the 30-45% of gross investment.Recently as the development of power-saving technology, high temperature, Low Temperature Thermal are carried out using heat exchanger The recycling of energy brings significant economic benefit.Currently, maximum usage amount is shell-and-tube heat exchanger in heat exchange equipment.With The development of petroleum industry and chemical industry, the shell-and-tube heat exchanger that various harsh conditions use is more and more, such as is refining oil Be hydrocracked, kerosene hydrogenation, gasoline, diesel add hydrogen and lube oil hydrogenation, catalytic reforming, hydrofinishing etc., the second in chemical industry Alkene cracking, ethylbenzene dehydrogenation, high-pressure and low-pressure polymerization, ammonia synthesis, natural gas conversion in chemical fertilizer etc., heat exchanger needs to bear pressure Power is from vacuum to 35MPa, temperature is up to 700 ~ 900 DEG C of harsh use environment.Since the 21th century, with device enlargement High speed development, the use of large heat exchanger is more and more wide, more and more frequently, technical difficulty is more and more big, reliability of equipment It is required that higher and higher.How to ensure heat transfer effect, improve the thermal efficiency, improves the reliability of equipment, have become highly important Research topic, the various large heat exchanger technologies applied under the conditions of special process emerge one after another, too numerous to enumerate.
Most common two kinds of heat exchangers are fixed tube-sheet exchanger and movable tube sheets heat exchanger in shell-and-tube heat exchanger.Such as Shown in attached drawing 1 and attached drawing 2, since heat exchanger tube pass and shell-side fluid exchange heat, temperature difference is certainly existed, when temperature difference arrives greatly It, just must be using the engineering measure for eliminating expansion when the temperature stress that can be born more than material.Such as attached drawing 1, in fixed tube sheet In heat exchanger, since both ends tube sheet is fixed, so expansion joint can only be arranged on shell, when elongation or contracting occur for tube bank In short-term, it can be compensated by the elongation and shortening of expansion joint, not leaked between tube side and shell side to ensure, guarantee base This heat transfer effect.If attached drawing 2 does not have expansion joint in movable tube sheets heat exchanger on shell, so tube side one end uses fixing pipe Plate, the other end (are raised the nose above water to breathe) using sliding tube sheet, and tube bank freely can extend and shorten in shell, but this measure solves It is the problem of expansion, inevitable by bringing another question, i.e., the Fluid Sealing problem between tube side and shell side.In order to solve This problem, common method are that, due to using sealing structure, necessarily have leakage, so only using packing box seal structure It can guarantee that the amount of leakage controls within the scope of acceptable, such as no more than the 5% of total flow.
In these two types of heat exchangers, fixed tube-sheet exchanger and movable tube sheets heat exchanger, usually by dress pattern, there are two types of horizontal Or it is vertical.Chinese patent CN200820151384.7 discloses a kind of horizontal shell with guided bearing and packing box seal Formula heat exchanger;Chinese patent CN200710043304.6 discloses a kind of horizontal shell with guided bearing and inner expansion joint Formula heat exchanger, it is intended to solve above as tube side, shell side thermal stress and expansion issues as caused by the temperature difference.In vertical floating head type In heat exchanger, stuffing-box is able to maintain good stress, there is certain circumferential uniformity, can guarantee the amount control of leakage Within the scope of acceptable.When case swells section is arranged in vertical heat exchanger, cutting when the unbearable earthquake of expansion joint occurs Shear force, and when being designed to bear earthquake shearing power, and the expansion almost lost due to rigidity and intensity.But Enlargement is that expansion joint is arranged on pressure hull, and reliability and device security are difficult to be guaranteed.
Summary of the invention
In order to overcome drawbacks described above, it is an object of the invention to propose a kind of novel vertical shell-and-tube heat exchanger, lead to Setting built-in heat exchanger structure is crossed, the leakage of fluid between tube side and shell side is avoided, while guaranteeing that the tube side of heat exchanger can be with Free expansion, to overcome thermal stress brought by the temperature difference of tube side and shell-side fluid, guarantees the reliability of heat exchanger.
To achieve the goals above, the technical solution of the present invention is as follows:
A kind of vertical shell-and-tube heat exchanger, including outer housing and the heat exchanger for being built in outer housing;The outer housing includes pressure resistance The upper cover and lower head of shell and pressure hull both ends;The heat exchanger includes shell, be arranged in shell both ends upper perforated plate, Lower perforated plate, tube bank, deflector and central tube;The upper perforated plate is equipped with centre bore;
The central tube lower end across upper cover, upper perforated plate centre bore to close to down tube Board position and lower perforated plate there are Flow channels;Central tube upper end import is thermal medium import;
Equipped with outer tube, the outer tube is socketed in central tube outer upper and forms exit passageway between the pipe outer wall of center, The central tube is connected with upper cover, upper perforated plate sealing respectively by outer tube;The exit passageway lower end is connected to heat transfer zone; The outer sleeve upper tube wall is connected by forming undergauge structure with the sealing of central tube upper end tube wall;The position on the outside of upper cover It sets, the outer tube is exported equipped with thermal medium;
The tube bank both ends are each passed through upper perforated plate, lower perforated plate and are fixedly connected respectively with upper perforated plate, lower perforated plate;It is described several to lead Flowing plate is axially uniformly distributed in the heat transfer zone formed between central tube and shell;
The lower perforated plate is fixedly linked with shell, is connected between the upper perforated plate and shell by the way that packing box seal structure is arranged;
Equipped with cone of support section, the shell lower end is fixedly linked by cone of support section with lower head;Cone of support section lower end is set There is process stream outlet, the pressure hull is equipped with process stream import.
As a further improvement of the present invention: corresponding upper cover and upper perforated plate section, the outer tube are equipped with expansion joint Structure.It is further ensured that the tube side of heat exchanger be free to extend and shorten, effectively controls the leakage between shell journey To a very small extent, guarantee the reliability of heat exchanger.
As a further improvement of the present invention: the reliability in order to further increase lower perforated plate, the lower perforated plate are equipped with For protecting against shock and heat-insulated baffle.
As a further improvement of the present invention: in order to improve the uniformity of heat exchange and the stability of equipment, the pneumatic shell Body, shell and central tube coaxial arrangement.
As a further improvement of the present invention: the reliability in order to guarantee central tube, the central tube tube wall inside are equipped with Bubble top heat insulation barrel.
As a further improvement of the present invention: in order to guarantee bear high temperature shell lower end reliability, combine and set Standby economy, inner walls end portion setting bubble top heat insulation barrel.
As the preferred embodiment of the present invention: the top heat insulation barrel is combined by bubble top plate, thermal insulation board and substrate.Its In, it steeps top plate and thermal insulation board bears high temperature, substrate is used for pressure-bearing.
As the preferred embodiment of the present invention: be equipped with support skirt, for outer housing support and with outer housing lower head It is fixedly connected.
The present invention avoids and expansion joint structure is arranged on pressure hull by the design of built-in heat exchanger;Pass through simultaneously By design of heat exchanger at a kind of shell-and-tube heat exchanger with sliding tube sheet and inner expansion joint, tube side can be reliably avoided The leakage of fluid between shell side, while guaranteeing that the tube side of heat exchanger be free to expand, to overcome tube side and shell side stream Thermal stress brought by the temperature difference of body guarantees the reliability of heat exchanger, low especially suitable for being heated using high temperature super heated steam Warm process stream.
Detailed description of the invention
Attached drawing 1 is fixed tube-sheet exchanger of the shell with expansion joint in background;
Attached drawing 2 is stuffing box type floating head heat exchanger in background;
Attached drawing 3 is vertical shell-and-tube heat exchanger of the invention.
Attached drawing 4 is packing box seal structural schematic diagram in the present invention.
Attached drawing 5 is bubble top heat insulation barrel structural schematic diagram in the present invention.
Specific embodiment
In order to deepen the understanding of the present invention, the present invention is done below in conjunction with drawings and examples and is further retouched in detail It states.
Embodiment, as shown in Figure 3: the present embodiment is related to a kind of vertical shell-and-tube heat exchanger, including outer housing and is built in The heat exchanger of outer housing.Wherein, outer housing includes the upper cover 12 and lower head 13 at pressure hull 11 and pressure hull both ends;It changes Hot device includes shell 21, is arranged in upper perforated plate 22, the lower perforated plate 23 at shell both ends, tube bank 25, deflector 26, central tube 24, outer Casing 27 and cone of support section 29;The pressure hull 11, shell 21 and central tube 24 are coaxially disposed.Heat exchanger upper end passes through housing Pipe 24 is connected with the sealing of the upper cover 12 of outer housing, and the lower end of heat exchanger passes through 13 phase of lower head of cone of support section 29 and outer housing Even;There are circular passages between pressure hull 11 and heat exchanger shell 21;Upper perforated plate 22 is equipped with centre bore.
As shown in Figure 3: in heat exchanger, 24 lower end of central tube passes through the centre bore of upper cover 12, upper perforated plate 22 under 23 position of tube sheet and there are flow channels between lower perforated plate 23;24 upper end import of central tube is thermal medium import;Outer tube 27 are socketed in 24 outer upper of central tube and form exit passageway between 24 outer wall of central tube, and 27 lower end of outer tube passes through upper envelope First 12, upper perforated plate 22 and therewith sealing be connected, exit passageway lower end is connected to heat transfer zone.It is as shown in Figure 3: 27 upper pipes of outer tube Wall is connected by undergauge mode with the sealing of 24 upper end tube wall of central tube;Positioned at 12 outer fix of upper cover, on the outer tube 27 Equipped with thermal medium outlet 271.29 lower end of cone of support section is exported equipped with process stream, and the pressure hull 11 is equipped with technique object Expect import 111.
As shown in Figure 3: 25 both ends of tube bank are each passed through upper perforated plate 22, lower perforated plate 23 and solid with upper perforated plate, lower perforated plate respectively Fixed connection.Several axial are uniformly distributed between central tube 24 and shell 21, upper perforated plate 22 and lower perforated plate 23 of deflector 26 are formed Heat transfer zone in, and mutually stagger, from bottom, first deflector is that material is flowed from center toward radially distant end, second Piece deflector makes material from radially distant end toward center flow.
As shown in Figure 3 and Figure 4: lower perforated plate 23 is fixedly linked with shell 21, passes through setting between upper perforated plate 22 and shell 21 Close 211 seal structure of stuffing-box is connected.Corresponding upper cover 12 and 22 section of upper perforated plate, outer tube 27 are equipped with 28 structure of expansion joint.
It is as shown in Figure 3 and Figure 5: if thermal medium reaches very high temperature, such as 900 DEG C when, in order to guarantee bear high temperature and The reliability of equipment, 24 tube wall of central tube inside are equipped with bubble top heat insulation barrel;From bottom, second between deflector and lower perforated plate Inner walls on setting bubble top heat insulation barrel.Lower perforated plate 23, which is equipped with, is used for protecting against shock and heat-insulated baffle 30,30 realities of baffle Example is applied to be made of high temperature alloy Steel material.Top heat insulation barrel is combined by bubble top plate 51, thermal insulation board 52 and substrate 53.
As shown in Figure 3: built-in heat exchanger is supported on lower head 23 by cone of support section 29, and entire heat exchanger includes shell Body 11 is by supporting skirt 3 to be supported on other equipment or ground.
The basic principle of the present embodiment are as follows: the process-stream PS1 of low temperature is entered in pressure hull by process stream import, and The circular passage being made up of pressure hull and shell is flowed from bottom to top, arrived by pressure hull, upper cover, upper perforated plate and After the upper tube box that outer tube is constituted, process-stream turns around to flow downward into tube bank heat exchange, by the high temperature heating medium of shell side After being heated to assigned temperature, into the lower tube box being made of lower perforated plate, cone of support section, left finally by process stream outlet This equipment.High temperature thermal medium SS1 flows downward after being entered by central tube import, into the shell side of heat exchanger, counts from bottom It is horizontal from inside to outside to skim over tube bank heat exchange in the first water conservancy diversion spacing that first piece of several deflectors and lower perforated plate are constituted, in pipe Low temperature process logistics heating, and pass sequentially through second, third, n-th water conservancy diversion plate spacing heat back and forth, until reaching last one It is from bottom to top flowed after a deflector by the exit passageway that outer tube and central tube are constituted, until being exported by thermal medium Equipment is flowed out, while thermal medium is cooled to low temperature by high temperature.
In the present embodiment, it is provided with packing box seal structure between shell and upper perforated plate, connects upper cover and upper perforated plate Outer tube on be provided with expansion joint, both having solved vertical heat exchanger in this way, free wxpansion is asked when high temperature difference between shell journey Topic, also avoids that expansion joint is arranged on heat exchanger pressure hull, it is ensured that the reliability and safety of equipment.
The present embodiment especially suitable between low temperature process material and high temperature thermal medium heat exchange and other leakage shadows Ring serious occasion.The reliability of equipment is significantly improved, the economy of equipment is ensure that, improves productivity effect.It is especially suitable It shares in the dehydrogenation reaction technique of aromatic hydrocarbons.
The above is only used to illustrate the technical scheme of the present invention and not limits, and those of ordinary skill in the art are to this The other modifications or equivalent replacement that the technical solution of invention is made, without departing from the spirit and scope of the technical program, It is intended to be within the scope of the claims of the invention.

Claims (8)

1. a kind of vertical shell-and-tube heat exchanger, it is characterised in that: including outer housing and the heat exchanger for being built in outer housing;It is described outer Shell includes the upper cover and lower head at pressure hull and pressure hull both ends;The heat exchanger includes shell, is arranged in shell Upper perforated plate, the lower perforated plate at both ends, tube bank, deflector and central tube;The upper perforated plate is equipped with centre bore;The central tube lower end Across upper cover, upper perforated plate centre bore to close to down tube Board position and there are flow channels lower perforated plate;The center The import of pipe upper end is thermal medium import;Equipped with outer tube, the outer tube is socketed in central tube outer upper and and central tube Exit passageway is formed between outer wall, the central tube is connected with upper cover, upper perforated plate sealing respectively by outer tube;The outlet Channel lower end is connected to heat transfer zone;The outer sleeve upper tube wall seals phase with central tube upper end tube wall by forming undergauge structure Even;Positioned at upper cover outer fix, the outer tube is exported equipped with thermal medium;The tube bank both ends are each passed through upper tube It plate, lower perforated plate and is fixedly connected respectively with upper perforated plate, lower perforated plate;Several deflectors are axially uniformly distributed in central tube and shell In the heat transfer zone formed between body;The lower perforated plate is fixedly linked with shell, is filled out between the upper perforated plate and shell by setting Expect that letter sealing structure is connected;Equipped with cone of support section, the shell lower end is fixedly linked by cone of support section with lower head;The branch Support cone section lower end is exported equipped with process stream, and the pressure hull is equipped with process stream import.
2. vertical shell-and-tube heat exchanger according to claim 1, it is characterised in that: corresponding upper cover and upper perforated plate section, The outer tube is equipped with expansion joint structure.
3. vertical shell-and-tube heat exchanger according to claim 1, it is characterised in that: the lower perforated plate, which is equipped with, is used for erosion control It hits and heat-insulated baffle.
4. vertical shell-and-tube heat exchanger according to claim 1 or 2, it is characterised in that: the pressure hull, shell and in The coaxial arrangement of heart pipe.
5. vertical shell-and-tube heat exchanger according to claim 1, it is characterised in that: be equipped with bubble on the inside of the central tube tube wall Push up heat insulation barrel.
6. vertical shell-and-tube heat exchanger according to claim 1, it is characterised in that: the inner walls end portion setting Bubble top heat insulation barrel.
7. vertical shell-and-tube heat exchanger according to claim 5 or 6, it is characterised in that: the top heat insulation barrel by bubble top plate, Thermal insulation board and substrate are combined.
8. vertical shell-and-tube heat exchanger according to claim 1, it is characterised in that: be equipped with support skirt, be used for outer housing Support and be fixedly connected with outer housing lower head.
CN201910576854.7A 2019-06-28 2019-06-28 Vertical shell-and-tube heat exchanger Pending CN110160377A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910576854.7A CN110160377A (en) 2019-06-28 2019-06-28 Vertical shell-and-tube heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910576854.7A CN110160377A (en) 2019-06-28 2019-06-28 Vertical shell-and-tube heat exchanger

Publications (1)

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CN110160377A true CN110160377A (en) 2019-08-23

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CN201910576854.7A Pending CN110160377A (en) 2019-06-28 2019-06-28 Vertical shell-and-tube heat exchanger

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112902710A (en) * 2021-01-27 2021-06-04 上海蓝滨石化设备有限责任公司 Cold wall jacket type high-temperature gas-gas heat exchanger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1340123A (en) * 1970-02-04 1973-12-12 Foster Wheeler Corp Liquid metal heat exchanger
CN2903882Y (en) * 2006-04-11 2007-05-23 刘金成 Shell-and-tube heat exchanger
CN201251387Y (en) * 2008-07-29 2009-06-03 徐志刚 Shell-and-tube heat exchanger with sliding guided support and stuffing box
CN105091634A (en) * 2014-05-21 2015-11-25 航天长征化学工程股份有限公司 Baffle rod type heat exchanger with built-in expansion joint
CN210441706U (en) * 2019-06-28 2020-05-01 常州瑞凯化工装备有限公司 Vertical shell-and-tube heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1340123A (en) * 1970-02-04 1973-12-12 Foster Wheeler Corp Liquid metal heat exchanger
CN2903882Y (en) * 2006-04-11 2007-05-23 刘金成 Shell-and-tube heat exchanger
CN201251387Y (en) * 2008-07-29 2009-06-03 徐志刚 Shell-and-tube heat exchanger with sliding guided support and stuffing box
CN105091634A (en) * 2014-05-21 2015-11-25 航天长征化学工程股份有限公司 Baffle rod type heat exchanger with built-in expansion joint
CN210441706U (en) * 2019-06-28 2020-05-01 常州瑞凯化工装备有限公司 Vertical shell-and-tube heat exchanger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
中国石化北京设计院编, 北京:中国石化出版社: "《石油炼厂设备》", 30 June 2001, pages: 224 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112902710A (en) * 2021-01-27 2021-06-04 上海蓝滨石化设备有限责任公司 Cold wall jacket type high-temperature gas-gas heat exchanger

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