CN203908384U - Linear shock cooling heat exchanger inlet connecting piece - Google Patents
Linear shock cooling heat exchanger inlet connecting piece Download PDFInfo
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- CN203908384U CN203908384U CN201420319233.3U CN201420319233U CN203908384U CN 203908384 U CN203908384 U CN 203908384U CN 201420319233 U CN201420319233 U CN 201420319233U CN 203908384 U CN203908384 U CN 203908384U
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Abstract
The utility model provides a linear shock cooling heat exchanger inlet connecting piece. One end of the inlet connecting piece is connected with a cracking furnace outlet furnace tube (1), and the other end of the inlet connecting piece is connected with a bilateral bushing heat exchange element (2). The inlet connecting piece is mainly composed of an inlet cone (3), a heat insulation piece (4) and a cooling medium connecting piece (5). The cooling medium connecting piece (5) is of a double-wall tube plate connecting piece structure, the lower gap of a cavity formed by the fact that the cooling medium connecting piece is in butt joint and welded with the bilateral bushing heat exchanger element (2) is larger than the upper gap of the cavity, and the thermal strength of the inlet connecting piece and the bilateral heat exchange element. The linear shock cooling heat exchanger inlet connecting piece is simple in structure, long in service life, short in cracked gas staying time, capable of avoiding mechanical decoking, and particularly suitable for the condition that the distance of radiation furnace tubes of ethylene cracking facilities is small.
Description
Technical field
The utility model relates to the equipment for cracking of ethylene technology, is specifically related to a kind of linear rapid-cooling heat exchanger inlet connecting.
Background technology
Pyrolysis furnace is the essential elements of ethylene unit.Cracking stock after Pintsch process, enters rapid-cooling heat exchanger and carries out coolingly fast in cracking furnace tube, prevents the generation of secondary response, reduces alkene loss, energy recovery is produced to steam simultaneously.Along with the development of ethane cracking furnace chilling technique, in order further to shorten the rapid-cooling heat exchanger adiabatic section time of staying, to avoid cracking gas maldistribution problem, newly-built and transformation pyrolysis furnace adopts linear rapid-cooling heat exchanger mostly with rapid-cooling heat exchanger at present.Layout and the radiating furnace tube configuration of linear rapid-cooling heat exchanger heat exchange unit have direct relation, and boiler tube outlet connects one to one with rapid-cooling heat exchanger inlet connecting conventionally.
As everyone knows, linear rapid-cooling heat exchanger connects cone, two sleeve heat exchange element, cooling medium connector, steam header, high-temperature medium header, hydraulic decoking hole etc. by entrance and forms.Based on this, the version of linear rapid-cooling heat exchanger is as follows: each two sleeve heat exchange element is comprised of two concentric pipes, wherein inner tube is walked high-temperature medium---the cracking gas of 800 ℃ of left and right, annular space between outer tube and inner tube is walked cooling medium---the gas-vapor mix of 350 ℃ of left and right, each two sleeve heat exchange element connects cone by an entrance and is connected with a pyrolysis furnace outlet boiler tube, a plurality of pairs of sleeve heat exchange elements are arranged in parallel into single or double arrangement, by steam header and high-temperature medium header, link together, form a linear rapid-cooling heat exchanger.Cooling medium connector of the prior art adopts double-walled tube sheet connecting-piece structure, double-walled tube sheet connector is connected with one group of two sleeve heat exchange element, thermal expansion difference stress between two sleeve heat exchange element inner and outer tubes can be subdued by inner tube prestretched, but between double-walled tube sheet connector inside and outside wall gap and inner and outer pipes, annular space is identical, in cracking gas heat transfer process, the calorific intensity that bear connector bottom is higher, easily damages.The revolving body that the cooling medium connector of another kind of prior art is outer convex surface, its structure can absorb between the inner tube outer tube of two sleeve heat exchange elements the formed swelling heat stress of difference due to tube wall temperature well, revolving body inside and outside wall gap is much larger than annular space between inner and outer pipes, connector bottom has more sufficient cooling medium to participate in heat exchange, but because cooling medium connector radial dimension is larger, this structure is not suitable for the situation that radiating furnace tube spacing is less.
Summary of the invention
The purpose of this utility model is to provide a kind of simple in structure, linear rapid-cooling heat exchanger inlet connecting of addressing the above problem.
The utility model provides a kind of linear rapid-cooling heat exchanger inlet connecting, one end of inlet connecting is connected with pyrolysis furnace outlet boiler tube 1, the other end is connected with two sleeve heat exchange elements 2, it is characterized in that linear rapid-cooling heat exchanger inlet connecting is mainly comprised of entrance cone 3, thermal insulation barriers 4 and cooling medium connector 5; Entrance cone 3 is that a bottom is with the hollow cylinder of tapering transition section, conical lower portion joint face is single wall, top cylinder connection face is double-walled, the single wall joint face of bottom is connected with pyrolysis furnace outlet boiler tube 1, simultaneously along entrance cone 3 length directions, bottom joint face is transitioned into the double-walled joint face at top from single wall, be divided into inwall joint face and outer wall joint face, its bottom lock of annular gap between the double-walled joint face at top; The outer wall joint face at entrance cone 3 tops is connected with the bottom of cooling medium connector 5; Annular gap between the double-walled joint face at entrance cone 3 tops is built-in with thermal insulation barriers 4; Cooling medium connector 5 is double-walled tube sheet connecting-piece structure, bottom is connected with the outer wall joint face at entrance cone 3 tops, outer wall pipe top is connected with the outer tube 7 of two sleeve heat exchange elements 2, and cooling medium connector 5 bottom one sides are provided with boiler feedwater interface 8, and opposite side is provided with clean mouthful 9 of blowdown; Cooling medium connector 5 bottoms have stretches boss and forms inner wall tube in one, be connected with the inner tube 6 of two sleeve heat exchange elements 2, the cavity forming after welding is docked respectively at the inner wall tube of cooling medium connector 5 and outer wall pipe top with inner tube 6, the outer tube 7 of two sleeve heat exchange elements 2, by the boiler feedwater interface 8 of cooling medium connector 5 front portions, make it to become the coolant guiding channel of introducing boiler feedwater.
Linear rapid-cooling heat exchanger inlet connecting boiler feedwater interface of the present utility model (8) is preferably in relative position, cooling medium connector (5) side with blowdown clean mouthful (9).
Cooling medium connector 5 of the present utility model is double-walled tube sheet connecting-piece structure, preferably internal and external walls ligament is greater than two sleeve heat exchange elements 2 inner and outer pipes gaps, form cavity underclearance d1 and be greater than upper gap d2, to reduce inlet connecting and inner tube calorific intensity, preferably d1 is than the large 3～10mm of d2.Reducing is preferably arranged at cooling medium connector 5 outer wall pipe tops, to dock welding with outer tube 7.In cooling medium connector 5 bottoms have, stretch boss formation inner wall tube and dock welding with inner tube 6.
Cooling medium connector 5 radial dimensions of the present utility model are less, are specially adapted to the situation that boiler tube spacing is less.
The linear rapid-cooling heat exchanger inlet connecting suggestion of the utility model adopts program of finite element to carry out numerical analysis to its temperature field, and during for Machine Design, carrying out reasonable material provides foundation.
A kind of linear rapid-cooling heat exchanger chilling inlet connecting that adopts the utility model to provide, it is simple in structure, long service life, the cracking gas time of staying is short, without mechanical decoking, cooling medium connector and cavity that inner and outer tubes form contribute to reduce inlet connecting and inner tube calorific intensity, and are convenient to Maintenance and Repair.Another feature is to adopt linear rapid-cooling heat exchanger inlet connecting radial dimension of the present utility model less, be applicable to the situation that boiler tube spacing is less, the linear rapid-cooling heat exchanger that can be used for newly-built ethylene cracker, also can be used for the transformation of the in-service linear rapid-cooling heat exchanger inlet connecting coming into operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the linear rapid-cooling heat exchanger inlet connecting of the utility model.
Fig. 2 is the A-A profile of cooling medium connector 5 in Fig. 1.
The specific embodiment
Fig. 1 is application a kind of linear rapid-cooling heat exchanger inlet connecting of the present utility model, is only a kind of form of the present utility model, and the utility model is not limited in this.
Consult Fig. 1, welding is docked with pyrolysis furnace outlet boiler tube 1 in one end of inlet connecting, and the other end docks welding with two sleeve heat exchange elements 2.Pintsch process gas enters linear rapid-cooling heat exchanger from pyrolysis furnace outlet boiler tube 1.
Consult Fig. 1, inlet connecting is comprised of entrance cone 3, thermal insulation barriers 4 and cooling medium connector 5, cooling medium connector 5 is double-walled tube sheet connecting-piece structure, there is reducing on its outer wall pipe top to dock welding with outer tube 7, in bottom has, stretch boss and form inner wall tube to dock welding with inner tube 6, dock the flow channel that the cavity forming after welding becomes cooling medium with inner tube 6, outer tube 7.Cavity underclearance d1 is 16.5mm, and cavity upper gap d2 is 12.5mm.
Consult Fig. 1, Fig. 2, cooling medium connector bottom one side is provided with boiler feedwater interface 8 to introduce cooling medium, in the cavity that cooling medium forms after cooling medium connector 5 docks welding with two sleeve heat exchange element inner tubes 6, outer tube 7, flows.The relative side in cooling medium connector 6 bottoms is also provided with clean mouthful 9 of blowdown, can play on the one hand the blowdown effect that is interrupted, on the other hand during online impatient cold heat exchanger parking maintenance, available corresponding tool cleans mouthfuls 9 by blowdown the impurity that is deposited on cooling medium connector 5 bottoms is carried out to mechanical removal.
Claims (5)
1. a linear rapid-cooling heat exchanger inlet connecting, one end of inlet connecting is connected with pyrolysis furnace outlet boiler tube (1), the other end is connected with two sleeve heat exchange elements (2), it is characterized in that linear rapid-cooling heat exchanger inlet connecting is mainly comprised of entrance cone (3), thermal insulation barriers (4) and cooling medium connector (5); Entrance cone (3) is that a bottom is with the hollow cylinder of tapering transition section, conical lower portion joint face is single wall, top cylinder connection face is double-walled, the single wall joint face of bottom is connected with pyrolysis furnace outlet boiler tube (1), simultaneously along entrance cone (3) length direction, bottom joint face is transitioned into the double-walled joint face at top from single wall, be divided into inwall joint face and outer wall joint face, its bottom lock of annular gap between the double-walled joint face at top; The outer wall joint face at entrance cone (3) top is connected with the bottom of cooling medium connector (5); Annular gap between the double-walled joint face at entrance cone (3) top is built-in with thermal insulation barriers (4); Cooling medium connector (5) is double-walled tube sheet connecting-piece structure, bottom is connected with the outer wall joint face at entrance cone (3) top, outer wall pipe top is connected with the outer tube (7) of two sleeve heat exchange elements (2), cooling medium connector (5) bottom one side is provided with boiler feedwater interface (8), and opposite side is provided with blowdown clean mouthful (9); Cooling medium connector (5) bottom has stretches boss in one and forms inner wall tube, be connected with the inner tube (6) of two sleeve heat exchange elements (2), the cavity forming after welding is docked respectively at the inner wall tube of cooling medium connector (5) and outer wall pipe top with inner tube (6), the outer tube (7) of two sleeve heat exchange elements (2), by the anterior boiler feedwater interface (8) of cooling medium connector (5), make it to become the coolant guiding channel of introducing boiler feedwater.
2. linear rapid-cooling heat exchanger inlet connecting according to claim 1, is characterized in that linear rapid-cooling heat exchanger inlet connecting boiler feedwater interface (8) and blowdown clean mouthful (9) are in relative position, cooling medium connector (5) side.
3. linear rapid-cooling heat exchanger inlet connecting according to claim 1, it is characterized in that cooling medium connector (5) is double-walled tube sheet connecting-piece structure, internal and external walls ligament is greater than two sleeve heat exchange elements (2) inner and outer pipes gap, forms cavity underclearance d1 and is greater than upper gap d2.
4. linear rapid-cooling heat exchanger inlet connecting according to claim 3, is characterized in that d1 is than the large 3～10mm of d2.
5. linear rapid-cooling heat exchanger inlet connecting according to claim 3, is characterized in that reducing is arranged at cooling medium connector (5) outer wall pipe top, to dock welding with outer tube (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420319233.3U CN203908384U (en) | 2014-06-16 | 2014-06-16 | Linear shock cooling heat exchanger inlet connecting piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420319233.3U CN203908384U (en) | 2014-06-16 | 2014-06-16 | Linear shock cooling heat exchanger inlet connecting piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203908384U true CN203908384U (en) | 2014-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420319233.3U Active CN203908384U (en) | 2014-06-16 | 2014-06-16 | Linear shock cooling heat exchanger inlet connecting piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203908384U (en) |
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2014
- 2014-06-16 CN CN201420319233.3U patent/CN203908384U/en active Active
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