CN203298648U - Polytetrafluoroethylene tube type air preheater - Google Patents

Polytetrafluoroethylene tube type air preheater Download PDF

Info

Publication number
CN203298648U
CN203298648U CN2013202834371U CN201320283437U CN203298648U CN 203298648 U CN203298648 U CN 203298648U CN 2013202834371 U CN2013202834371 U CN 2013202834371U CN 201320283437 U CN201320283437 U CN 201320283437U CN 203298648 U CN203298648 U CN 203298648U
Authority
CN
China
Prior art keywords
air
bobbin carriage
sealing
polytetrafluoroethylene
tube
Prior art date
Application number
CN2013202834371U
Other languages
Chinese (zh)
Inventor
高晓红
Original Assignee
中石化洛阳工程有限公司
中石化炼化工程(集团)股份有限公司
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 中石化洛阳工程有限公司, 中石化炼化工程(集团)股份有限公司 filed Critical 中石化洛阳工程有限公司
Priority to CN2013202834371U priority Critical patent/CN203298648U/en
Application granted granted Critical
Publication of CN203298648U publication Critical patent/CN203298648U/en

Links

Abstract

The utility model provides a polytetrafluoroethylene tube type air heater. The polytetrafluoroethylene tube type air heater is mainly composed of a smoke inlet section, a smoke outlet section, a smoke tube box, an air inlet section, an air outlet section, an air tube box, a composite tube plate, a polytetrafluoroethylene tube and a sealing assembly. The sealing assembly is used for sealing the part between the composite tube plate and the polytetrafluoroethylene tube, and is mainly composed of a compression screw, a supporting sleeve, a sealing tube base and a sealing gasket. The end of the polytetrafluoroethylene tube can expand axially and freely inside a channel formed by the sealing tube base and an inner cavity of the compression screw. The sealing performance is good, the sealing structure cannot be damaged, and the sealing reliability is high.

Description

A kind of polytetrafluoroethyltubular tubular air preheater
Technical field
The utility model belongs to petrochemical industry, relates to the corrosion resistant polytetrafluoroethyltubular tubular air preheater of a kind of low temperature.
Background technology
The present air preheater that uses at petroleum chemical industry is generally by the metal material manufacture.But when there was corrosivity in medium, the air preheater that traditional metal material is manufactured, obviously can not meet instructions for use.The method that solves mainly contains: (1) uses expensive metal material, and as titanium alloy etc., this can improve the manufacturing cost of air preheater greatly, and sometimes can not prevent the generation of corroding.(2) use the nonmetal graphite material, graphite material has good heat transfer property, and very strong decay resistance is arranged.But because graphite-pipe is fragile material, the stress brittle failure occurs easily, have been subject to certain impact in its reliability and service life.(3) use polyfluortetraethylene pipe to make heat transfer element, polytetrafluoroethylene (PTFE) has good decay resistance, but due to the stable performance of polytetrafluoroethylene (PTFE) chemistry, the more difficult control of the welding of tube and tube plate, because the Tube-sheet Welding technological principle of polytetrafluoroethylene (PTFE) is different from the steel heat exchanger Tube-sheet Welding, just also can't carry out the interior welds quality testing at present, can only be by the macroscopic examination means, as the water pressure test or air-tight test, determine the fastness of solder side.To the indivedual defects that exist on solder side, can't measure immediately, can only make regular check on and make up in use for some time.This has just affected the reliability of teflon heat exchanger application.
Patent CN200920022497.1 discloses a kind of high-efficient energy-saving polytetrafluoroethyltube tube type heat exchanger, comprise cylindrical shell, heat exchanger tube and closure member, heat exchanger tube is comprised of the graphite modified ptfe composite pipe that some Shu Binglie arrange, closure member comprises end socket, tube sheet and cover plate, the import and export of product medium are on end socket, heat exchanger tube is fixed on cylindrical shell with deflection plate, between heat exchanger tube and tube sheet, adopts metal bath high temperature hot melt expanded and welded tube joint to connect.But due to the stable performance of polytetrafluoroethylene (PTFE) chemistry, the more difficult control of the welding of tube and tube plate, airtight quality is difficult to guarantee.In addition, because the thermal coefficient of expansion of polytetrafluoroethylene (PTFE) is far longer than carbon steel, the thermal expansion in use can't discharge, and easily makes weld seam produce stress rupture, makes heat exchanger failure.
The utility model content
Poor for the tubular type teflon heat exchanger Tube-sheet Welding sealing that solves the prior art existence, the technical problem that medium is revealed easily occurs, the utility model provides a kind of polytetrafluoroethyltubular tubular air preheater.
The polytetrafluoroethyltubular tubular air preheater that the utility model provides mainly is comprised of gas approach section, exhanst gas outlet section, flue gas bobbin carriage, air intlet section, air outlet slit section, air bobbin carriage, clad tubesheet, polyfluortetraethylene pipe and black box; Gas approach section and exhanst gas outlet section are positioned at the two ends of flue gas bobbin carriage, with the flue gas bobbin carriage, are on same axis, and gas approach section, flue gas bobbin carriage and exhanst gas outlet section form exhaust gases passes; The flue gas bobbin carriage is interior for flue gas bobbin carriage axis, to be vertically arranged polyfluortetraethylene pipe, the air intlet section is connected with the air outlet slit section by polyfluortetraethylene pipe and air bobbin carriage, and air intlet section, polyfluortetraethylene pipe, air bobbin carriage and air outlet slit section form air duct jointly; Wherein black box is for the sealing between clad tubesheet and polyfluortetraethylene pipe, mainly by housing screw, stop sleeve, tight socket and sealing gasket, formed, pore and clad tubesheet that tight socket passes on clad tubesheet weld together, stop sleeve is loaded on the inwall of polytetrafluoroethylene (PTFE) pipe end, the polytetrafluoroethylene (PTFE) pipe end that stop sleeve is housed passes tight socket, between tight socket inwall and polytetrafluoroethylene (PTFE) pipe end outer wall, form an annular space, sealing gasket is equipped with in the annular space bottom, and sealing gasket is fixed with housing screw.
In scheme of the present utility model, because polyfluortetraethylene pipe is softer, first at pipe end, install stop sleeve additional, while preventing from sealing, produce irregular deformation, affect sealing effectiveness.Next polyfluortetraethylene pipe is penetrated in tight socket, and the sealing gasket of packing into from the end of polyfluortetraethylene pipe, finally load onto housing screw, rotatably compress screw crush seal pad, make it produce distortion, reach sealing effectiveness.Due to the thermal coefficient of expansion of polytetrafluoroethylene (PTFE) much larger than carbon steel material, so during the hot work of air preheater, the swell increment of polyfluortetraethylene pipe will be much larger than carbon steel, while adopting the direct welded structure of tube and tube plate, because thermal stress can't discharge, and the sealing of fragile tube and tube plate.And in scheme of the present utility model, the polytetrafluoroethylene (PTFE) pipe end can free wxpansion vertically in the passage that tight socket and housing screw inner chamber form, not only sealing is good, and can not damage hermetically-sealed construction, and this just can guarantee reliable sealing property between the tube and tube plate.
The accompanying drawing explanation
Fig. 1 is the structural representation of polytetrafluoroethyltubular tubular air preheater of the present utility model;
Fig. 2 is the structural representation of black box of the air preheater of Fig. 1.
In figure: 1-air intlet section, 2-clad tubesheet, 3-polyfluortetraethylene pipe, 4-gas approach section, 5-air bobbin carriage, 6-air outlet slit section, 7-exhanst gas outlet section, 8-flue gas bobbin carriage, 9-housing screw, the 10-stop sleeve, 11-tight socket, 12-sealing ring, 13-sealing ring.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the polytetrafluoroethyltubular tubular air preheater that provides of the utility model mainly is comprised of gas approach section 4, exhanst gas outlet section 7, flue gas bobbin carriage 8, air intlet section 1, air outlet slit section 6, air bobbin carriage 5, clad tubesheet 2, polyfluortetraethylene pipe 3 and black box; Gas approach section 4 and exhanst gas outlet section 7 are positioned at the two ends of flue gas bobbin carriage 8, with flue gas bobbin carriage 8, are on same axis, and gas approach section 4, flue gas bobbin carriage 8 and exhanst gas outlet section 7 form exhaust gases passes; Flue gas bobbin carriage 8 is interior for flue gas bobbin carriage 8 axis, to be vertically arranged polyfluortetraethylene pipe 3, air intlet section 1 is connected with air outlet slit section 6 by polyfluortetraethylene pipe 3 and air bobbin carriage 5, the common air duct that forms of air intlet section 1, polyfluortetraethylene pipe 3, air bobbin carriage 5 and air outlet slit section 6.
Flue gas is entered by the gas approach section 4 of air preheater shown in Figure 1, in flue gas bobbin carriage 8, from the gap outside polyfluortetraethylene pipe, passes through, and after air heat-exchange in polyfluortetraethylene pipe, through exhanst gas outlet section 7, discharges air preheaters.Cold air is flowed through after the outer flue gas heat exchange of polyfluortetraethylene pipe in air intlet section 1 enters polyfluortetraethylene pipe 3 with in flue gas bobbin carriage 8, the temperature rising, enter the next stage preheater by air outlet slit section 6.Air is realized roundabout flowing by air bobbin carriage 5 in polyfluortetraethylene pipe, reached fully and the purpose of flue gas heat exchange.
Described black box is for the fixing and sealing between clad tubesheet 2 and polyfluortetraethylene pipe 3, as shown in Figure 2, black box mainly is comprised of housing screw 9, stop sleeve 10, tight socket 11 and sealing gasket, sealing gasket can be the sealing ring 12 shown in Fig. 2, also can be the sealing ring 13 shown in Fig. 2, can certainly be the assembly of the sealing ring 12 shown in Fig. 2 and sealing ring 13, the cross section of sealing ring 12 is circular, the cross section of sealing ring 13 is rectangle, when using sealing ring 13, plane of a loop one side of sealing ring 13 contacts with housing screw 9.Housing screw 9 is the cylindrical body with a flange, and the outer wall of cylindrical body is processed with external screw thread, and the internal diameter of cylindrical body is slightly larger than the external diameter of polyfluortetraethylene pipe 3, and general monolateral gap is 0.2~0.8mm.Tight socket 11 is the cylindrical body with an inner convex platform, the external diameter of the bigger polyfluortetraethylene pipe 3 of the internal diameter at boss place, and general monolateral gap is 0.2~0.8mm, the inwall of boss top cylindrical body is processed with internal thread.The external diameter of stop sleeve 10 equals the internal diameter of polyfluortetraethylene pipe 3.on clad tubesheet 2, have pore, tight socket 11 welds together away from pore and the clad tubesheet 2 that an end of boss passes on clad tubesheet 2, stop sleeve 10 is loaded on the inwall of polytetrafluoroethylene (PTFE) pipe end, the polytetrafluoroethylene (PTFE) pipe end that stop sleeve 10 is housed passes tight socket 11, between tight socket 11 inwalls and polytetrafluoroethylene (PTFE) pipe end outer wall, form an annular space, the annular space bottom is the boss of tight socket 11, sealing ring 12 and sealing ring 13 successively is inserted on the boss that the polytetrafluoroethylene (PTFE) pipe end is arranged on tight socket 11, housing screw 9 and tight socket 11 are realized being threaded by the external screw thread on it and internal thread, by screwing housing screw 9 crush seal rings 13 and sealing ring 12, make it produce distortion, reach sealing effectiveness.
The material of main part of clad tubesheet 2 is metal materials, is generally carbon steel, and as Q235 etc., the inner surface that it contacts with flue gas covers one deck polytetrafluoroethylene (PTFE) thin plate.The material of housing screw 9, stop sleeve 10, tight socket 11 is generally carbon steel, as Q235 etc.The material of sealing gasket is polytetrafluoroethylene (PTFE) or silicon rubber.
The single tube hermetically-sealed construction that the utility model adopts a kind of screw thread to compress, carry out the sealing of tube and tube plate with polytetrafluoroethylene (PTFE) or silicone rubber seal gasket, need not weld, and is easy for installation, makes the sealing of tubular type teflon heat exchanger more reliable, longer service life.

Claims (3)

1. a polytetrafluoroethyltubular tubular air preheater, mainly be comprised of gas approach section, exhanst gas outlet section, flue gas bobbin carriage, air intlet section, air outlet slit section, air bobbin carriage, clad tubesheet, polyfluortetraethylene pipe and black box; Gas approach section and exhanst gas outlet section are positioned at the two ends of flue gas bobbin carriage, with the flue gas bobbin carriage, are on same axis, and gas approach section, flue gas bobbin carriage and exhanst gas outlet section form exhaust gases passes; The flue gas bobbin carriage is interior for flue gas bobbin carriage axis, to be vertically arranged polyfluortetraethylene pipe, the air intlet section is connected with the air outlet slit section by polyfluortetraethylene pipe and air bobbin carriage, and air intlet section, polyfluortetraethylene pipe, air bobbin carriage and air outlet slit section form air duct jointly; It is characterized in that: described black box is for the sealing between clad tubesheet and polyfluortetraethylene pipe, mainly by housing screw, stop sleeve, tight socket and sealing gasket, formed, pore and clad tubesheet that tight socket passes on clad tubesheet weld together, stop sleeve is loaded on the inwall of polytetrafluoroethylene (PTFE) pipe end, the polytetrafluoroethylene (PTFE) pipe end that stop sleeve is housed passes tight socket, between tight socket inwall and polytetrafluoroethylene (PTFE) pipe end outer wall, form an annular space, sealing gasket is equipped with in the annular space bottom, and sealing gasket is fixed with housing screw.
2. preheater according to claim 1 is characterized in that: described sealing gasket is that cross section is the sealing ring of circle, or for cross section, is the sealing ring of rectangle, or is the assembly of the two.
3. preheater according to claim 1 and 2, it is characterized in that: described sealing gasket is made by polytetrafluoroethylene (PTFE) or silicon rubber.
CN2013202834371U 2013-05-15 2013-05-15 Polytetrafluoroethylene tube type air preheater CN203298648U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013202834371U CN203298648U (en) 2013-05-15 2013-05-15 Polytetrafluoroethylene tube type air preheater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013202834371U CN203298648U (en) 2013-05-15 2013-05-15 Polytetrafluoroethylene tube type air preheater

Publications (1)

Publication Number Publication Date
CN203298648U true CN203298648U (en) 2013-11-20

Family

ID=49574653

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2013202834371U CN203298648U (en) 2013-05-15 2013-05-15 Polytetrafluoroethylene tube type air preheater

Country Status (1)

Country Link
CN (1) CN203298648U (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104567478A (en) * 2015-01-29 2015-04-29 广东百思特管业科技有限公司 Mounting structure of working medium nozzle of tubular heat exchanger
CN104596326A (en) * 2015-01-29 2015-05-06 广东百思特管业科技有限公司 Mounting structure for inlet-outlet working medium nozzle of coiled pipe heat exchanger
CN105822854A (en) * 2016-05-31 2016-08-03 江苏金由新材料有限公司 Connecting structure of non-metallic pipe and metal plate
CN105822843A (en) * 2016-05-31 2016-08-03 江苏金由新材料有限公司 Sealing structure of PTFE pipe and metal pattern plate and sealing method thereof
CN106403697A (en) * 2016-11-16 2017-02-15 北京淘氪科技有限公司 Heat exchanger and connecting method thereof
CN106679454A (en) * 2016-12-30 2017-05-17 浙江赛迅环保科技有限公司 PTFE heat exchanger

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104567478A (en) * 2015-01-29 2015-04-29 广东百思特管业科技有限公司 Mounting structure of working medium nozzle of tubular heat exchanger
CN104596326A (en) * 2015-01-29 2015-05-06 广东百思特管业科技有限公司 Mounting structure for inlet-outlet working medium nozzle of coiled pipe heat exchanger
CN105822854A (en) * 2016-05-31 2016-08-03 江苏金由新材料有限公司 Connecting structure of non-metallic pipe and metal plate
CN105822843A (en) * 2016-05-31 2016-08-03 江苏金由新材料有限公司 Sealing structure of PTFE pipe and metal pattern plate and sealing method thereof
CN106403697A (en) * 2016-11-16 2017-02-15 北京淘氪科技有限公司 Heat exchanger and connecting method thereof
CN106679454A (en) * 2016-12-30 2017-05-17 浙江赛迅环保科技有限公司 PTFE heat exchanger
CN106679454B (en) * 2016-12-30 2018-08-17 浙江赛迅环保科技有限公司 A kind of PTFE heat exchangers

Similar Documents

Publication Publication Date Title
CN101408466B (en) Method and device for detecting leakage of shell type heat exchanger
CN104989558A (en) Double-layer pipe joint for engine gas supply system
WO2016094069A1 (en) Ribbed tubeless heat exchanger for fluid heating systems including a rib component and methods of manufacture thereof
US10337800B2 (en) Modular plate and shell heat exchanger
WO2011134400A1 (en) Bidirectional pressure self balancing stop valve
CN201081598Y (en) Pressure test device for floating head exchanger
CN101216263A (en) Pipe shell type heat-exchanger
CN104614310B (en) A kind of high temperature pressure corrosion electro-chemical measuring apparatus and measuring method
CN201285248Y (en) Connection structure of heat exchanger pipe and pipe plate
US4283615A (en) Device for stopping a leak in a straight portion of a heat-exchanger tube
WO2020168714A1 (en) Gas distribution pipe assembly and gas stove
CN205298942U (en) Combined casing cap
CN103672943B (en) Air preheater float tube sealed elastic sealing shroud device
CN201672846U (en) Double-wave double-pipe heat exchanger
CN201209733Y (en) Double-skin duct connecting device
CN205607185U (en) Heat exchanger convenient to dismantle heat exchange tube
CN203443426U (en) Super-high temperature gas cooler
CN102072406A (en) Device and method for detecting product pipeline leakage condition
WO2015184716A1 (en) High-pressure-resistant integrated leakage-free rotating compensator
CN203949545U (en) A kind of shell-and-tube exchanger channel structure
CN103884213A (en) Corrosion-resistant shell and tube heat exchanger
CN204202439U (en) A kind of Novel single tube journey floating head heat exchanger
CN201289423Y (en) Leak detection structure for composite board equipment
CN201163160Y (en) Heat exchanger with inside and outside fins used with radiant tube burner
CN204127557U (en) Novel precise formula high pressure resistant rotary compensator

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant