CN108343943A - A kind of overheat segment structure improving high pressure heater available rate - Google Patents
A kind of overheat segment structure improving high pressure heater available rate Download PDFInfo
- Publication number
- CN108343943A CN108343943A CN201710045909.2A CN201710045909A CN108343943A CN 108343943 A CN108343943 A CN 108343943A CN 201710045909 A CN201710045909 A CN 201710045909A CN 108343943 A CN108343943 A CN 108343943A
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- Prior art keywords
- tube
- pressure heater
- steam
- overheat
- high pressure
- Prior art date
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Links
- 238000009413 insulation Methods 0.000 claims abstract description 12
- 230000005494 condensation Effects 0.000 claims description 12
- 238000009833 condensation Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000003628 erosive effect Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 230000004888 barrier function Effects 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 6
- 235000014171 carbonated beverage Nutrition 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Cookers (AREA)
Abstract
The present invention relates to high-pressure heater fields, disclose a kind of overheat segment structure improving high pressure heater available rate, including shell and steam inlet, the side of the shell is equipped with tube sheet, and U-tube is disposed in shell, and the port of U-tube is fixed on the tube sheet, and it is provided with insulation board between tube sheet and the superheat section, the steam inlet is located on the shell near tube sheet, is located at the lower section of the steam inlet, the top of U-tube, which is arranged side by side, multiple anti-sticks.Erosion control baffle at steam inlet is set in the prior art, although there is certain vapor barrier effect, but the steam kept off still can directly be washed into the U-tube of outermost after being folded to, and after arranging the anti-stick of the present invention, after superheated steam enters, the anti-stick can be washed away first, then flow to the U-tube of lower section again, the case where directly being washed away so as to avoid U-tube, to inhibiting, tube wall is thinning larger effect.
Description
Technical field
The present invention relates to high-pressure heater field more particularly to the overheat segment structures of high-pressure heater.
Background technology
High-pressure heater is the important equipment in thermal power plant and nuclear power plant's water supply heat back system, Performance And Reliability
Directly affect economy and the safety of unit operation.In recent years, high parameter, large sized unit are continuously increased, unit is frequent
Startup and load variations drastically, ` keep the service condition of heater more and more severe.High-pressure heater in actual operation,
Once it leaks, it just must out of service, overhaul plan.By the investigation of the high-pressure heater to having run both at home and abroad, I
Find that the position that high-pressure heater pipe bundle is easily damaged has：(1) superheated steam cooling section（Hereinafter referred to as superheat section）Steam
Two or three array of pipes of entrance outermost, the pipe of (2) superheat section near exit,（3）The pipe of the most interior a few rows in tube bank center.
Specifically, the reason of causing high-pressure heater to leak has very much, only consider from design angle, it is relatively conventional have with
Lower three aspects：（1）Wash away erosion：Steam flow channel is small, when steam flow rate is high, water mist is especially contained in steam, carbonated drink is long-term
It washes away, tube outer wall is gradually thinning, and under thermal stress and carbonated drink differential pressure action, U-tube weak part will appear bulge, cracking very
It is final to generate leakage to explosion；（2）Tube vibration：Restrain freedom length（Without support span）It is long, when steam flow rate is high,
Tube bank generates vibration in the case where steam disturbs force effect, when excitation force frequency coincide with tube bank intrinsic frequency or its multiple, can draw
Tube bank resonance is played, amplitude greatly increases, and tube bank is caused to damage, and generates leakage；（3）Restrain center U-tube minimum bend half
Diameter is small, and bent pipe deformation is big in manufacture, local tube wall by draw it is thin, tube wall is washed away in operation it is larger, easily with damage.
Lead to the appearance of above-mentioned reason, mainly since existing high-pressure heater overheat segment structure has the following disadvantages：（1）
Although using erosion control baffle design at steam inlet, outermost pipe is washed away still very serious by carbonated drink（Erosion control baffle is visible
Signified steam baffle in Chinese patent notification number CN2753964Y（5））；（2）Easily there is steam flow rate height in superheat section exit, wet
Degree is big, and carbonated drink occurs and washes away；（3）Restrain freedom length（Without support span）Greatly, it is also easy to produce vibration；（4）Restrain center U
Shape pipe minimum bending radius is small, and local tube wall is relatively thin, fragile in U-tube operation.
Invention content
Technical problem to be solved by the invention is to provide a kind of high-pressure heaters to overheat segment structure, effectively to control high pressure
The slip of heater U-tube improves high pressure heater available rate, and economic benefit is brought for power plant.
The technical solution adopted by the present invention to solve the technical problems is：A kind of overheat improving high pressure heater available rate
The side of segment structure, including shell and steam inlet, the shell is equipped with tube sheet, and U-tube, the end of U-tube are disposed in shell
Mouth is fixed on the tube sheet, and insulation board is provided between tube sheet and the superheat section, the steam inlet position
On shell near the tube sheet, it is located at the lower section of the steam inlet, the top of U-tube, which is arranged side by side, there are multiple anti-sticks.
The pipe in three row region of U-tube bundle outermost in existing structure can be replaced with to the anti-stick, the anti-stick
Metalwork can be used.Erosion control baffle at steam inlet is set in the prior art, although there is certain vapor barrier effect,
It is the U-tube that outermost still can be directly washed into after the steam kept off is folded to.And after arranging the anti-stick of the present invention, work as overheat
After steam enters, the anti-stick can be washed away first, then flowed to the U-tube of lower section again, directly washed away so as to avoid U-tube
The case where, to inhibiting, tube wall is thinning larger effect.
Further, further include involucrum, involucrum is semicircular arc structure, is arranged in the periphery of the U-tube of superheat section latter end；
The involucrum, bottom are sealed by bottom plate, are sealed by second baffle close to the side of condensation section, close to superheat section leading portion
Side is sealed by first baffle and there are gaps between the bottom and the bottom plate of first baffle passes through for steam；The involucrum
Top be further opened with notch in involucrum steam flow into condensation section.After steam enters, first flowed laterally down relative to U-tube
Through superheat section leading portion, superheat section latter end is longitudinally flowed into using the gap and enters involucrum, is laterally flowed up in involucrum,
Finally flowed out from the notch at top, into condensation section, therefore after steam is folded to flowing in superheat section, when flowing out superheat section,
Flow velocity is reduced, and is washed away to tube wall to alleviate, and the steam after outflow can be gradually evenly distributed to along inner walls
In entire condensation section.
Further, be provided between the notch at the top of the steam inlet and involucrum prevent steam by sealing
Plate.The sealing plate is not passed through the U-tube of lower section and is flowed directly to the top of involucrum after can preventing steam from entering, then flow into condensation
Section, is not achieved heat exchange purpose, i.e. the sealing plate prevents the generation of steam short circuit.
Further, innermost U-tube is arranged in the top in the gap between first baffle bottom and bottom plate.It should
Gap is the steam flow channel below most inner side U-tube, which has been connected to the leading portion and latter end of superheat section.In the prior art
Since the minimum bending radius positioned at innermost U-tube is smaller, after causing U-tube to be bent, tube wall is relatively thin, fragile, and this
Innermost U-tube is invented above the gap so that its position is raised, to increase minimum bending radius,
It avoids because bending radius is too small, pipe part tube wall when making is excessively thin, and impaired situation is easy after being washed away.
Further, one end of the anti-stick passes through insulation board to be fixed on the tube sheet, and the other end is fixed on institute
On the first baffle stated.
Further, one end of the bottom plate is fixed on second baffle, and the other end is fixed on insulation board.
Further, the anti-stick is solid metal rod.
Further, distance can be according to actual steam stream between first baffle and second baffle, first baffle and insulation board
Speed determines, while the quantity of U-tube support plate and spacing is adjustable is configured, is adjusted according to actual conditions, to reduce pipe
The no-support spaning distance of beam prevents the generation of vibration.
In conclusion the beneficial effects of the invention are as follows：（1）By the way that anti-stick is arranged, avoids tube bank and directly washed away
It corrodes；（2）The flow velocity of superheat section exit steam is reduced, and the steam flowed out can be evenly distributed to condensation section, it is therefore prevented that mistake
The case where hot arc exit steam flow rate is excessively high, and tube bank is easy to be washed erosion；（3）The minimum for increasing most inner side U-tube is curved
Bilge radius improves erosion resistibility to increase wall thickness；（4）The generation for effectively preventing the vibration of superheat section U-tube, keeps away
The case where having exempted from tube bank vibrated destruction.Therefore the present invention effectively controls the slip of high-pressure heater U-tube, improves height
The devoting rate for pressing heater, improves the economic benefit of power plant.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is that the A-A of Fig. 1 is cut to figure；
Fig. 3 is the front view of involucrum；
Fig. 4 is the cross-sectional view of Fig. 3；
Fig. 5 is the steam flow schematic diagram of Fig. 1；
Fig. 6 is the steam flow schematic diagram of Fig. 2；
In figure label for：1- tube sheets, 2- insulation boards, 3- anti-sticks, 4-U shape pipes, 5- steam inlets, 6- sealing plates, 7- shells, 8-
Involucrum, 9- distance sink tubes, 10- second baffles, 11- bottom plates, 12- support plates, 13- first baffles, the gaps 14-, 15- notches.
Specific implementation mode
The present invention is described in further detail with reference to specific embodiment, but embodiments of the present invention are not limited to
This.
As shown in Figs 1-4, a kind of overheat segment structure improving high pressure heater available rate, including shell 7, the shell 7
Side be equipped with tube sheet 1, U-tube 4 is disposed in shell 7, the port of U-tube 4 is fixed on the tube sheet 1, and in tube sheet 1
Insulation board 2 is provided between the superheat section.
The superheat section is divided into leading portion and latter end, and leading portion is disposed with steam inlet 5, and latter end is provided with involucrum 8.Described
Steam inlet 5 is disposed adjacent on the shell 7 near tube sheet 1, and positioned at the lower section of steam inlet 5, the top of U-tube 4 is side by side
Multiple anti-sticks 3 are provided with, anti-stick 3 may be arranged in existing overheat segment structure at three row's U-tube of outermost（I.e. by existing knot
Three row's U-tube of outermost replaces with the anti-stick 3 of the present invention in structure, is equivalent to and replaces with false tube here）, which is
Solid metal rod piece, one end are threadedly coupled across insulation board 2 with tube sheet 1, and the other end passes through first baffle 13 and welded with it
Securely.Involucrum 8 is semicircular arc structure, is arranged in the periphery of the U-tube 4 of superheat section latter end；The involucrum 8, bottom passes through
Bottom plate 11 seals, and is sealed by second baffle 10 close to the side of condensation section, passes through first gear close to the side of superheat section leading portion
Plate 13 seals and there are gaps 14 to pass through for steam between the bottom of first baffle 13 and the bottom plate 11, the bottom plate 11 1
End is welded on 10 bottom of second baffle, and the other end is welded on insulation board 2；The top of the involucrum 8 is further opened with the confession of notch 15
Steam in involucrum 8 flows into condensation section.
The steam entered in order to prevent bypasses the U-tube of superheat section leading portion, enters directly into lacking above superheat section latter end
Mouthfuls 15 cause steam short-circuit, therefore 8 outer wall of involucrum between the steam inlet 5 and notch 15 and are welded between 7 inner wall of shell
Be connected to prevent steam by semicircle sealing plate 6.
In addition, U-tube is not arranged in 14 region of gap between 13 bottom of first baffle and bottom plate 11, that is to say, that most interior
The U-tube 4 of side is located at the top in the gap 14.The minimum bending radius that most inner side U-tube can be increased in this way, avoid because
Bending radius is too small, and pipe part tube wall when making is excessively thin, and impaired situation is easy after being washed away.
It is flowed to again after first washing away anti-stick 3 as it can be seen in figures 5 and 6, after steam is entered by steam inlet 5 about steam flow
The U-tube 4 of lower section, flows relative to U-tube laterally down later, flow at the bottom plate relative to U-tube longitudinally through
Gap 14 enters in the involucrum of superheat section latter end, is then laterally flowed up relative to U-tube again, finally lacking from top
Mouth 15 flows out, and after outflow, steam is gradually evenly distributed to along the inner wall of high-pressure heater shell 7 in entire condensation section.Due to steaming
Vapour will not directly be washed into U-tube 4 after entering, but be entered back into involucrum 8 after first washing away anti-stick 3, therefore largely
It avoids pipe and is directly washed away erosion, eventually lead to the possibility of leakage；In addition, since steam is repeatedly folded in superheat section
Afterwards, the flow velocity that condensation section is flowed into from 8 top notch 15 of involucrum decreases compared with the prior art, therefore the intensity that tube wall is washed away
It is extenuated.
In addition, using segmental baffle in existing structure（Segmental baffle can be found in Chinese patent notification number
Fig. 2 of CN205482419U）U-tube is supported, and the pipe no-support spaning distance of segmental baffle incision is baffle plate
One times of spacing is easy vibration so that the intrinsic frequency of pipe reduces.And it is of the invention, since steam is in superheat section
U-tube is flowed transversely across, therefore support plate 12 can be used, distance sink tube 9 is coordinated to be supported U-tube, support plate 12 is using whole
Formula support construction（It need not consider the problems of that steam passes through among plate body）, more preferably to the fixation of U-tube, support effect, effectively
The case where preventing tube bundle vibration in operation, and then avoid the case where causing U-tube to leak because of vibration.
To sum up, the present invention effectively controls the slip of high-pressure heater U-tube, improves the input of high-pressure heater
Rate improves the economic benefit of power plant.
Claims (7)
1. a kind of overheat segment structure improving high pressure heater available rate, including shell（7）And steam inlet（5）, the shell
（7）Side be equipped with tube sheet（1）, shell（7）Inside it is disposed with U-tube（4）, U-tube（4）Port be fixed on the tube sheet
（1）On, and in tube sheet（1）It is provided with insulation board between the superheat section（2）, the steam inlet（5）Positioned at tube sheet
（1）Neighbouring shell（7）On, it is characterised in that：Positioned at the steam inlet（5）Lower section, U-tube（4）Top set side by side
It is equipped with multiple anti-sticks（3）.
2. a kind of overheat segment structure improving high pressure heater available rate according to claim 1, it is characterised in that：Also wrap
Include involucrum（8）, involucrum（8）For semicircular arc structure, it is arranged in the U-tube of superheat section latter end（4）Periphery；The involucrum
（8）, bottom passes through bottom plate（11）Sealing passes through second baffle close to the side of condensation section（10）Sealing, close to superheat section leading portion
Side pass through first baffle（13）Sealing and first baffle（13）Bottom and the bottom plate（11）Between there are gaps（14）
Pass through for steam；The involucrum（8）Top be further opened with notch（15）For involucrum（8）Interior steam flows into condensation section.
3. a kind of overheat segment structure improving high pressure heater available rate according to claim 2, it is characterised in that：Institute
State steam inlet（5）With involucrum（8）The notch at top（15）Between be provided with prevent steam by sealing plate（6）.
4. a kind of overheat segment structure improving high pressure heater available rate according to claim 2 or 3, it is characterised in that：
Innermost U-tube（4）It is arranged in first baffle（13）Bottom and bottom plate（11）Between the gap（14）Top.
5. a kind of overheat segment structure improving high pressure heater available rate according to claim 2 or 3, it is characterised in that：
The anti-stick（3）One end pass through insulation board（2）It is fixed on the tube sheet（1）On, the other end is fixed on described first
Baffle（13）On.
6. a kind of overheat segment structure improving high pressure heater available rate according to claim 2 or 3, it is characterised in that：
The bottom plate（11）One end be fixed on second baffle（10）On, the other end is fixed on insulation board（2）On.
7. a kind of overheat segment structure improving high pressure heater available rate according to claim 1, it is characterised in that：It is described
Anti-stick（3）For solid metal rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710045909.2A CN108343943B (en) | 2017-01-22 | 2017-01-22 | Overheating section structure for improving input rate of high-pressure heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710045909.2A CN108343943B (en) | 2017-01-22 | 2017-01-22 | Overheating section structure for improving input rate of high-pressure heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108343943A true CN108343943A (en) | 2018-07-31 |
| CN108343943B CN108343943B (en) | 2023-11-07 |
Family
ID=62974479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710045909.2A Active CN108343943B (en) | 2017-01-22 | 2017-01-22 | Overheating section structure for improving input rate of high-pressure heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108343943B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53147103A (en) * | 1977-05-27 | 1978-12-21 | Hitachi Ltd | Multitubular system heat exchager |
| JPH08145305A (en) * | 1994-11-21 | 1996-06-07 | Hitachi Ltd | Feed water heater and power generating plant |
| CN2753964Y (en) * | 2004-12-16 | 2006-01-25 | 上海动力设备有限公司 | Superheated steam cooling device for surface horizontal heater |
| CN1818464A (en) * | 2000-09-01 | 2006-08-16 | 株式会社东芝 | Feed water heater |
| CN201016589Y (en) * | 2006-11-29 | 2008-02-06 | 田雅杰 | Shell-and-tube steam-water heat exchanger |
| CN201104137Y (en) * | 2007-09-29 | 2008-08-20 | 华南理工大学 | Helical baffle plate supporting special-shaped pipe condenser |
| CN201548101U (en) * | 2009-10-27 | 2010-08-11 | 辽宁华标压力容器有限公司 | Heat supply network heater |
| CN201772807U (en) * | 2010-08-26 | 2011-03-23 | 北京广厦环能科技有限公司 | Heat exchange tube bundle anti-impact device of shell and tube heat exchanger |
| CN102798116A (en) * | 2012-08-26 | 2012-11-28 | 哈尔滨锅炉厂有限责任公司 | Horizontal-type three-section thermal power high-pressure feed-water heater and heating method |
| CN202973973U (en) * | 2012-12-11 | 2013-06-05 | 吉林省同达传热技术有限公司 | Overall expansion type heater for heating network |
| CN203464834U (en) * | 2013-07-19 | 2014-03-05 | 青岛博德化机有限公司 | Scour-preventing device used for heat exchange tube bundle of heat exchanger |
| CN105258547A (en) * | 2015-08-20 | 2016-01-20 | 无锡鼎邦换热设备有限公司 | Anti-scouring structure of heat exchanger |
| CN205482419U (en) * | 2016-03-31 | 2016-08-17 | 国网湖北省电力公司咸宁供电公司 | Horizontal high pressure feed water heater |
| CN106288322A (en) * | 2016-10-18 | 2017-01-04 | 东方电气集团东方锅炉股份有限公司 | A kind of nothing reducing low-pressure heater device diameters is indulged and is plunderred heat exchange superheat section structure |
| CN206469247U (en) * | 2017-01-22 | 2017-09-05 | 东方电气集团东方锅炉股份有限公司 | A kind of overheat segment structure for improving high pressure heater available rate |
-
2017
- 2017-01-22 CN CN201710045909.2A patent/CN108343943B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53147103A (en) * | 1977-05-27 | 1978-12-21 | Hitachi Ltd | Multitubular system heat exchager |
| JPH08145305A (en) * | 1994-11-21 | 1996-06-07 | Hitachi Ltd | Feed water heater and power generating plant |
| CN1818464A (en) * | 2000-09-01 | 2006-08-16 | 株式会社东芝 | Feed water heater |
| CN2753964Y (en) * | 2004-12-16 | 2006-01-25 | 上海动力设备有限公司 | Superheated steam cooling device for surface horizontal heater |
| CN201016589Y (en) * | 2006-11-29 | 2008-02-06 | 田雅杰 | Shell-and-tube steam-water heat exchanger |
| CN201104137Y (en) * | 2007-09-29 | 2008-08-20 | 华南理工大学 | Helical baffle plate supporting special-shaped pipe condenser |
| CN201548101U (en) * | 2009-10-27 | 2010-08-11 | 辽宁华标压力容器有限公司 | Heat supply network heater |
| CN201772807U (en) * | 2010-08-26 | 2011-03-23 | 北京广厦环能科技有限公司 | Heat exchange tube bundle anti-impact device of shell and tube heat exchanger |
| CN102798116A (en) * | 2012-08-26 | 2012-11-28 | 哈尔滨锅炉厂有限责任公司 | Horizontal-type three-section thermal power high-pressure feed-water heater and heating method |
| CN202973973U (en) * | 2012-12-11 | 2013-06-05 | 吉林省同达传热技术有限公司 | Overall expansion type heater for heating network |
| CN203464834U (en) * | 2013-07-19 | 2014-03-05 | 青岛博德化机有限公司 | Scour-preventing device used for heat exchange tube bundle of heat exchanger |
| CN105258547A (en) * | 2015-08-20 | 2016-01-20 | 无锡鼎邦换热设备有限公司 | Anti-scouring structure of heat exchanger |
| CN205482419U (en) * | 2016-03-31 | 2016-08-17 | 国网湖北省电力公司咸宁供电公司 | Horizontal high pressure feed water heater |
| CN106288322A (en) * | 2016-10-18 | 2017-01-04 | 东方电气集团东方锅炉股份有限公司 | A kind of nothing reducing low-pressure heater device diameters is indulged and is plunderred heat exchange superheat section structure |
| CN206469247U (en) * | 2017-01-22 | 2017-09-05 | 东方电气集团东方锅炉股份有限公司 | A kind of overheat segment structure for improving high pressure heater available rate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108343943B (en) | 2023-11-07 |
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