CN103899794A - Catalytic cracking regeneration flue gas water-sealed tank and method for preventing inner barrel from deformation - Google Patents
Catalytic cracking regeneration flue gas water-sealed tank and method for preventing inner barrel from deformation Download PDFInfo
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- CN103899794A CN103899794A CN201410084753.5A CN201410084753A CN103899794A CN 103899794 A CN103899794 A CN 103899794A CN 201410084753 A CN201410084753 A CN 201410084753A CN 103899794 A CN103899794 A CN 103899794A
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- sealed tank
- inner core
- water sealed
- pipe
- inner barrel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K13/00—Other constructional types of cut-off apparatus; Arrangements for cutting-off
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention belongs to the technical field of petroleum processing, and discloses a catalytic cracking regeneration flue gas water-sealed tank and a method for preventing an inner barrel from deformation. The method is characterized in that an axial thermal expansion device is arranged on an overflow port tube of the inner barrel of the water-sealed tank and is composed of a cylindrical inner sleeve, an annular plate plug and a metal bellows, one end of the cylindrical inner sleeve is connected with the inner barrel of the water-sealed tank, the other end of the cylindrical inner sleeve is connected with the annular plate plug with an inner hole, and the inner hole of the annular plate plug is fixedly connected with the outer wall of the metal bellows communicated with the overflow port tube; a circumferential thermal expansion device which deforms under stress to absorb heating circumferential expansion of the inner barrel is arranged on the circumference of a wallboard of the inner barrel of the water-sealed tank. By the adoption of the catalytic cracking regeneration flue gas water-sealed tank and the method for preventing the inner barrel from deformation, axial expansion caused by heating of the inner barrel can be effectively absorbed, circumferential expansion caused by heating of the inner barrel can also be effectively absorbed, the problems that an inner barrel of an existing water-sealed tank expands and deforms under heat and can only be forced to protrude inwards, and then permanent deformation is generated are solved, the inner barrel is prevented from damage, and the service life of the inner barrel is prolonged.
Description
Technical field
The invention belongs to Petroleum Processing Technology field, relate in particular to a kind of regeneration fume from catalytic cracking water sealed tank related in catalytic cracking unit regenerated flue gas utilization system and prevent the method that inner core is out of shape.
Background technique
The solid powder th-1 catalyst using in petroleum processing catalytic cracking unit, complete after a course of reaction, solid powder th-1 catalyst surface can produce carbon distribution, area carbon makes the activity decreased of solid powder th-1 catalyst, in order to recover the activity of solid powder th-1 catalyst, need in the regenerator of catalytic cracking unit, pass into 0.2MPa pressurized air by solid powder th-1 catalyst area carbon burning-off.The burning process of solid powder th-1 catalyst in regenerator makes solid powder th-1 catalyst remove area carbon activity recovery on the one hand, can produce on the other hand the high-temperature flue gas of 700 DEG C of left and right, and also contain a certain amount of CO in regenerated flue gas.
The comprehensive Utilization Ways of regenerated flue gas generally has two: the one, and regenerated flue gas drives flue gas turbine expander, and flue gas turbine expander drives main air blower (be regenerator burn compressed-air actuated compressor is provided).The regenerated flue gas of low pressure is by carbon monoxide incinerator in addition, and further oxygen, fully burns the CO in regenerated flue gas, and high-temperature flue gas produces Steam Recovery heat energy by heating water.In this two-way transducing energy recovery device running, switching is that inevitably water sealed tank is with regard to a suitable switching valve.
The working principle of water sealed tank is as follows, and water sealed tank has two kinds of working staties: a kind of is the opening state that regenerated flue gas is passed through; Another is the closed condition that regenerated flue gas is cut off.See the existing water sealed tank of Fig. 1: when water sealed tank is during in opening state: pressure is generally 0.01～0.015Mpa, temperature is that 650～750 DEG C of high temperature regeneration flue gases are entered in water sealed tank by smoke inlet pipe 4, then turn back upwards with the annular pass that regenerated flue gas inlet duct 4 forms from water sealed tank housing 1 and insulated lining 5, and discharged by smoke outlet tube 3.Under water sealed tank opening state, pressure is 0.01～0.015Mpa, 650～750 DEG C of high temperature regeneration flue gases of temperature pass through water sealed tank, that is to say the passage of water sealed tank as just regenerated flue gas process, due to temperature, in water sealed tank design process, require all inner member selections will meet high temperature resistant requirement.
When water sealed tank is during in closed condition: water sealed tank need to proceed as follows while switching to closed condition from opening state: by water entrance 10 water filling in water sealed tank inner core 2, in the time that water sealed tank inner core 2 water levels exceed flow-off pipe 8, water will flow out the young water sealed tank 9 of overflow that enters the outside regulation and control of water sealed tank water sealed tank water level from flow-off pipe 8, and overflow is young, and water sealed tank 9 is from top to bottom respectively equipped with spill pipe, water-adding pipe and offlet.8 times edges of water sealed tank flow-off pipe are highly h to the lower edge of smoke inlet pipe 3, when design, must ensure the poor pressure reduction being greater than between smoke inlet and smoke outlet of hydrostatic pressure being produced by discrepancy in elevation h water-head, guarantee water seals regenerated flue gas like this, realizes regenerated flue gas closed condition.
In the time that water sealed tank switches to opening state by closed condition, as long as by water entrance 10, the water in water sealed tank inner core 2 being bled off and can be realized.
There are the following problems for existing water sealed tank, and water sealed tank, as two formula cut-off valves, is not to be just exactly in closed condition in opening state in process of production.Two kinds of working staties determine in water sealed tank that temperature is in alternately changing.When water sealed tank is during in opening state, 650 DEG C ~ 750 DEG C high temperature regeneration flue gases directly contact with inner member.Therefore, the interior all metal internals that directly contact with high temperature regeneration flue gas of water sealed tank for example: the materials such as inner core 2, smoke inlet pipe 3, flow-off 8, water entrance pipe 10 are all selected resistant to elevated temperatures austenitic stainless steel material.
Metallic material is heated and can produces thermal expansion, and Austenitic Stainless Steel is about α=18x10 at 650 DEG C ~ 750 DEG C linear expansion coefficients
-6.
The inner core 2 made from Austenitic Stainless Steel is current ubiquitous problem because expanded by heating causes the inwardly protruding distortion of local many places.
It is as follows that problem produces reason: under water sealed tank opening state, inner core 2 temperature and flue-gas temperature are basic identical, the inner core 2 made from Austenitic Stainless Steel is heated and understands dilatancy, dilatancy is along the axial and circumferencial direction of inner core, if inner core 2 is highly 4000mm, diameter is 3800mm, be that 700 DEG C of calculating are got off by inner core temperature, this water sealed tank inner core 2 axial expansion amount: 4000x700 DEG C x18x10
-6=50.4mm; Peripheral orientation expansion quantity: 3.14x3800x700 DEG C x18x10
-6=150.3mm.
Learn by calculating, the expanded by heating distortion of inner core 2 is very large, does not have at present fine consideration to solve expansion absorption problem in water sealed tank structural design, to such an extent as to causes inner core distortion.Because having solid insulated lining 5, inner core 2 outsides retrain, so inner core 2 can only force its inwardly protruding and produce distortion in the time that expanded by heating is out of shape, this distortion is permanent, can't reduce and recover by Yin Wendu, and along with the increase of two states switching times in using process, distortion can be more and more serious.
Summary of the invention
For overcoming the deficiencies in the prior art, the invention provides a kind of regeneration fume from catalytic cracking water sealed tank and prevent the method that inner core is out of shape.
For achieving the above object, the present invention adopts following technological scheme:
A kind of regeneration fume from catalytic cracking water sealed tank, comprise: water sealed tank inner core, axial thermal expansion device, circumferential thermal expansion equipment, described water sealed tank inner core 2 flow-off pipe 8 places are provided with axial thermal expansion device, axial thermal expansion device is made up of cylindrical shape inner sleeve 6, ring flat-plate shutoff, metal bellows 7, cylindrical shape inner sleeve 6 one end are connected with water sealed tank inner core 2, cylindrical shape inner sleeve 6 the other ends are connected with the ring flat-plate shutoff with endoporus, and the endoporus of ring flat-plate shutoff is fixedly connected with metal bellows 7 outer walls that are communicated with flow-off pipe 8; On described water sealed tank inner core 2 wallboard circumference, be provided with stress deformation and absorb the be heated circumferential thermal expansion equipment of circumferential expansion of inner core 2, circumferentially thermal expansion equipment is made up of several longitudinal U-shaped wavy metals 11 that are distributed on water sealed tank inner core 2 wallboards.
A kind of regeneration fume from catalytic cracking water sealed tank, the longitudinal U-shaped wavy metal 11 on described water sealed tank inner core 2 wallboard circumference is set to 4, is often divided into 90 °, and arranges along even circumferential.
A kind of regeneration fume from catalytic cracking water sealed tank, described U-shaped wavy metal 11 use thin plate entirety are compressing, and the wave number of metal bellows is at least 2; The material of U-shaped metal wave 11 is identical or close with the material of inner core 2.
Regeneration fume from catalytic cracking water sealed tank prevents a method for inner core distortion, and its step is as follows:
1, the corrective measure of axial thermal expansion
1) add a cylindrical shape inner sleeve 6 at water sealed tank inner core 2 flow-off pipe 8 places, cylindrical shape inner sleeve 6 extends internally, one end of cylindrical shape inner sleeve 6 and inner core 2 are welded together, the other end ring flat-plate shutoff with endoporus welded together with cylindrical shape inner sleeve 6 with, the diameter of bore of ring flat-plate is larger than flow-off pipe 8 external diameters, flow-off pipe 8 can pass ring flat-plate endoporus, and welded together to flow-off pipe 8 and ring flat-plate; So just make water sealed tank flow-off pipe 8 fusion length between water sealed tank housing 1 and inner core 2 increase, be conducive to take technical measures to make flow-off pipe 8 stress deformations absorb the axial thermal expansion of inner core 2;
2), reduce the rigidity of water sealed tank flow-off pipe 8 this segment length between water sealed tank housing 1 and inner core 2, be to adopt rigid phase to compare the metal bellows 7 of little Austenitic Stainless Steel making;
2, the circumferentially corrective measure of thermal expansion, to add a longitudinal U-shaped metal wave 11 at inner core 2 circumference every 90 °, U-shaped metal wave 11 use austenitic stainless steel thin plate are made, the rigidity of U-shaped metal wave 11 is less than the rigidity of inner core 2, in the time that inner core 2 is heated generation circumferential expansion, the first compressed distortion of U-shaped metal wave 11 that rigidity is smaller, inner core 2 wallboards avoid producing distortion, in the time that water sealed tank is switched to closed condition, temperature reduces U-shaped metal wave 11 and restores.
Owing to adopting technological scheme as above, the present invention has following superiority
A kind of regeneration fume from catalytic cracking water sealed tank and prevent the method for inner core distortion, the inner core in use causing due to expanded by heating based on water sealed tank is to projecting inward Deformation Reasons analysis, find the key that solves water sealed tank inner core expanded by heating absorption problem, if expanded by heating can be absorbed effectively, the problem on deformation of inner core just can be controlled.Because the expanded by heating of inner core is divided into axial expansion and circumferencial direction expansion.Structure by inner core knows, is impossible by the axial thermal expansion that itself is out of shape to absorb the nearly 50mm of inner core.
The present invention adopts water sealed tank flow-off pipe to absorb the method expanding, and increases the length colleague who absorbs distortion and reduce the rigidity of water sealed tank spill pipe, can effectively absorb and be subject to thermogenetic axial expansion because of inner core.Equally, add a longitudinal U-shaped metal wave at inner core circumference every 90 °, the rigidity of U-shaped metal wave is far smaller than the rigidity of inner core, is heated while producing circumferential expansion at inner core, the first compressed distortion of U-shaped metal wave that rigidity is smaller, and inner tube wall can not produce distortion.Solve existing water sealed tank because of expansion absorption problem, avoided inner core 2 can only force its inwardly protruding in the time that expanded by heating is out of shape and the permanent deformation that produces.
Brief description of the drawings
Fig. 1 is the structural representation of existing water sealed tank;
Fig. 2 is the structural representation of regeneration fume from catalytic cracking water sealed tank;
Fig. 3 is the sectional view of Fig. 2 inner core;
Fig. 4 is the enlarged view of Fig. 3 local I;
In figure: water sealed tank housing 1, inner core 2, smoke outlet tube 3, regenerated flue gas inlet duct 4, solid insulated lining 5, cylindrical shape inner sleeve 6, metal bellows 7, flow-off pipe 8, overflow is young water sealed tank 9, water entrance 10, U-shaped metal wave 11.
Embodiment
As shown in Figure 2,3, 4, a kind of regeneration fume from catalytic cracking water sealed tank, comprise: water sealed tank inner core, axial thermal expansion device, circumferential thermal expansion equipment, described water sealed tank inner core 2 flow-off pipe 8 places are provided with axial thermal expansion device, axial thermal expansion device is made up of cylindrical shape inner sleeve 6, ring flat-plate shutoff, metal bellows 7, cylindrical shape inner sleeve 6 one end are connected with water sealed tank inner core 2, cylindrical shape inner sleeve 6 the other ends are connected with the ring flat-plate shutoff with endoporus, and the endoporus of ring flat-plate shutoff is fixedly connected with metal bellows 7 outer walls that are communicated with flow-off pipe 8; On described water sealed tank inner core 2 wallboard circumference, be provided with stress deformation and absorb the be heated circumferential thermal expansion equipment of circumferential expansion of inner core 2, circumferentially thermal expansion equipment is made up of several longitudinal U-shaped wavy metals 11 that are distributed on water sealed tank inner core 2 wallboards.
Longitudinal U-shaped wavy metal 11 on described water sealed tank inner core 2 wallboard circumference is set to 4, is often divided into 90 °, and arranges along even circumferential.Described U-shaped wavy metal 11 use thin plate entirety are compressing, and the wave number of metal bellows is at least 2; The material of U-shaped metal wave 11 is identical or close with the material of inner core 2.
Regeneration fume from catalytic cracking water sealed tank prevents a method for inner core distortion, and its step is as follows:
1, the corrective measure of axial thermal expansion
1) add a cylindrical shape inner sleeve 6 at water sealed tank inner core 2 flow-off pipe 8 places, cylindrical shape inner sleeve 6 extends internally, one end of cylindrical shape inner sleeve 6 and inner core 2 are welded together, the other end ring flat-plate shutoff with endoporus welded together with cylindrical shape inner sleeve 6 with, the diameter of bore of ring flat-plate is larger than flow-off pipe 8 external diameters, flow-off pipe 8 can pass ring flat-plate endoporus, and welded together to flow-off pipe 8 and ring flat-plate; So just make water sealed tank flow-off pipe 8 fusion length between water sealed tank housing 1 and inner core 2 increase, be conducive to take technical measures to make flow-off pipe 8 stress deformations absorb the axial thermal expansion of inner core 2;
2), reduce the rigidity of water sealed tank flow-off pipe 8 this segment length between water sealed tank housing 1 and inner core 2, be to adopt rigid phase to compare the metal bellows 7 of little Austenitic Stainless Steel making;
2, the circumferentially corrective measure of thermal expansion, to add a longitudinal U-shaped metal wave 11 at inner core 2 circumference every 90 °, U-shaped metal wave 11 use austenitic stainless steel thin plate are made, the rigidity of U-shaped metal wave 11 is less than the rigidity of inner core 2, in the time that inner core 2 is heated generation circumferential expansion, the first compressed distortion of U-shaped metal wave 11 that rigidity is smaller, inner core 2 wallboards avoid producing distortion, in the time that water sealed tank is switched to closed condition, temperature reduces U-shaped metal wave 11 and restores.
Specific embodiment is as follows,
The inner core in use causing due to expanded by heating based on water sealed tank is to projecting inward Deformation Reasons analysis, and it is crucial solving water sealed tank inner core expanded by heating absorption problem, if expanded by heating can be absorbed effectively, the problem on deformation of inner core just can be controlled.Because the expanded by heating of inner core is divided into axial expansion and circumferencial direction expansion two-part, deal with problems and also start with from these two-part.
For the axial expansion problem of inner core, structure by inner core is known, the major constraints point that retrains its axial expansion is flow-off adapter place of water sealed tank, the flow-off of water sealed tank is taken over outer end and the welding of water sealed tank housing, inner and inner core welding, and the spacing of water sealed tank housing and inner core be only insulated lining layer thickness, generally about 100mm, the pipe that 100mm is long is impossible by the axial thermal expansion that itself is out of shape to absorb the nearly 50mm of inner core.It is exactly the rigidity that increases the length colleague who absorbs distortion and reduce water sealed tank spill pipe that water sealed tank flow-off pipe absorbs the thinking expanding, and can effectively absorb and be subject to thermogenetic axial expansion because of inner core.
1, solve the scheme of axial thermal expansion problem, to add a cylindrical shape inner sleeve 6 at water sealed tank inner core 2 flow-off pipe 8 places, cylindrical shape inner sleeve 6 extends internally, one end of cylindrical shape inner sleeve 6 and inner core 2 are welded together, the other end ring flat-plate shutoff with endoporus welded together with cylindrical shape inner sleeve 6 with, the diameter of bore of ring flat-plate is more bigger than flow-off pipe 8 external diameters, flow-off pipe 8 can pass ring flat-plate endoporus, and welded together to flow-off pipe 8 and ring flat-plate.So just make water sealed tank flow-off pipe 8 fusion length between water sealed tank housing 1 and inner core 2 increase, be conducive to take technical measures to make flow-off pipe 8 stress deformations absorb the axial thermal expansion of inner core 2; And reduce the rigidity of water sealed tank flow-off pipe 8 this segment length between water sealed tank housing 1 and inner core 2, solution is exactly in the middle of this section pipe, this section of great Austenitic stainless steel pipe of rigidity is replaced to the metal bellows 7 of the Austenitic Stainless Steel making that rigidity is less.
2, solve the scheme of circumferential thermal expansion problem, identical with the thinking that solves axial thermal expansion, add a longitudinal U-shaped metal wave 11 at inner core 2 circumference every 90 ° exactly, U-shaped metal wave 11 use austenitic stainless steel thin plate are made, the rigidity of U-shaped metal wave 11 is far smaller than the rigidity of inner core 2, in the time that inner core 2 is heated generation circumferential expansion, the first compressed distortion of U-shaped metal wave 11 that rigidity is smaller, and inner core 2 wallboards can not produce distortion.In the time that water sealed tank is switched to closed condition, along with temperature reduces, U-shaped metal wave 11 restores.
Claims (4)
1. a regeneration fume from catalytic cracking water sealed tank, comprise: water sealed tank inner core, it is characterized in that: described water sealed tank inner core 2 flow-off pipe 8 places are provided with axial thermal expansion device, axial thermal expansion device is made up of cylindrical shape inner sleeve 6, ring flat-plate shutoff, metal bellows 7, cylindrical shape inner sleeve 6 one end are connected with water sealed tank inner core 2, cylindrical shape inner sleeve 6 the other ends are connected with the ring flat-plate shutoff with endoporus, and the endoporus of ring flat-plate shutoff is fixedly connected with metal bellows 7 outer walls that are communicated with flow-off pipe 8; On described water sealed tank inner core 2 wallboard circumference, be provided with stress deformation and absorb the be heated circumferential thermal expansion equipment of circumferential expansion of inner core 2, circumferentially thermal expansion equipment is made up of several longitudinal U-shaped wavy metals 11 that are distributed on water sealed tank inner core 2 wallboards.
2. a kind of regeneration fume from catalytic cracking water sealed tank according to claim 1, is characterized in that: the longitudinal U-shaped wavy metal 11 on described water sealed tank inner core 2 wallboard circumference is set to 4, is often divided into 90 °, and arranges along even circumferential.
3. a kind of regeneration fume from catalytic cracking water sealed tank according to claim 1, is characterized in that: described U-shaped wavy metal 11 use thin plate entirety are compressing, and the wave number of metal bellows is at least 2; The material of U-shaped metal wave 11 is identical or close with the material of inner core 2.
4. regeneration fume from catalytic cracking water sealed tank prevents a method for inner core distortion, it is characterized in that: its step is as follows:
One, the corrective measure of axial thermal expansion
1), add a cylindrical shape inner sleeve 6 at water sealed tank inner core 2 flow-off pipe 8 places, cylindrical shape inner sleeve 6 extends internally, one end of cylindrical shape inner sleeve 6 and inner core 2 are welded together, the other end ring flat-plate shutoff with endoporus welded together with cylindrical shape inner sleeve 6 with, the diameter of bore of ring flat-plate is larger than flow-off pipe 8 external diameters, flow-off pipe 8 can pass ring flat-plate endoporus, and welded together to flow-off pipe 8 and ring flat-plate; So just make water sealed tank flow-off pipe 8 fusion length between water sealed tank housing 1 and inner core 2 increase, be conducive to take technical measures to make flow-off pipe 8 stress deformations absorb the axial thermal expansion of inner core 2;
2), reduce the rigidity of water sealed tank flow-off pipe 8 this segment length between water sealed tank housing 1 and inner core 2, be to adopt rigid phase to compare the metal bellows 7 of little Austenitic Stainless Steel making;
Two, the circumferentially corrective measure of thermal expansion, to add a longitudinal U-shaped metal wave 11 at inner core 2 circumference every 90 °, U-shaped metal wave 11 use austenitic stainless steel thin plate are made, the rigidity of U-shaped metal wave 11 is less than the rigidity of inner core 2, in the time that inner core 2 is heated generation circumferential expansion, the first compressed distortion of U-shaped metal wave 11 that rigidity is smaller, inner core 2 wallboards avoid producing distortion, in the time that water sealed tank is switched to closed condition, temperature reduces U-shaped metal wave 11 and restores.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410084753.5A CN103899794A (en) | 2014-03-10 | 2014-03-10 | Catalytic cracking regeneration flue gas water-sealed tank and method for preventing inner barrel from deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410084753.5A CN103899794A (en) | 2014-03-10 | 2014-03-10 | Catalytic cracking regeneration flue gas water-sealed tank and method for preventing inner barrel from deformation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103899794A true CN103899794A (en) | 2014-07-02 |
Family
ID=50991300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410084753.5A Withdrawn CN103899794A (en) | 2014-03-10 | 2014-03-10 | Catalytic cracking regeneration flue gas water-sealed tank and method for preventing inner barrel from deformation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103899794A (en) |
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2014
- 2014-03-10 CN CN201410084753.5A patent/CN103899794A/en not_active Withdrawn
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Application publication date: 20140702 |