CN110067993A - A kind of steam boiler of down-comer caliber change - Google Patents
A kind of steam boiler of down-comer caliber change Download PDFInfo
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- CN110067993A CN110067993A CN201810632537.8A CN201810632537A CN110067993A CN 110067993 A CN110067993 A CN 110067993A CN 201810632537 A CN201810632537 A CN 201810632537A CN 110067993 A CN110067993 A CN 110067993A
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- 239000012530 fluid Substances 0.000 claims abstract description 40
- 230000007423 decrease Effects 0.000 claims abstract description 8
- 239000003381 stabilizer Substances 0.000 claims description 85
- 239000000203 mixture Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 26
- 239000012071 phase Substances 0.000 description 21
- 230000000694 effects Effects 0.000 description 17
- 238000012546 transfer Methods 0.000 description 16
- 239000007789 gas Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 230000000630 rising effect Effects 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 9
- 239000007791 liquid phase Substances 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
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- 238000011105 stabilization Methods 0.000 description 3
- 230000005514 two-phase flow Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000011555 saturated liquid Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 230000008439 repair process Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
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- 230000036262 stenosis Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/12—Forms of water tubes, e.g. of varying cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Geometry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present invention provides a kind of steam boilers, and including upper drum and lower drum and the tedge and down-comer that are connected between upper drum and lower drum, along the direction of decline tube fluid flowing, the caliber of down-comer constantly reduces.The setting constantly declined by down-comer, to meet the variation of continually changing fluid volume and pressure, so that pressure is evenly distributed on the whole, heat exchange uniformly, can save material, reduce cost.
Description
Technical field
The present invention is the project for entrusting colleges and universities to be researched and developed.The invention belongs to steam generation field more particularly to a kind of steamings
Boiler furnace belongs to the field IPC code F22.
Background technique
Receive heat from furnace and fluid is made to flow to high-order circuit referred to as " riser circuit " from low level, and receives heat
It measures and the circuit for making fluid flow to low level from a high position is referred to as " decline circuit ".One circuit is by a pipe or one group of pipe
Composition, this group of pipe draw from a common point, such as header or steamdrum, terminate at and be similarly public affairs as header or drum
Concurrent.
In the design of most of natural circulation boilers, the heat pipe of evaporation section is constituted generally for fluid flows upward, but
In more drum-type boilers, the downflow heated tube of steam-generating bank is quite different.In such boiler, downflow heated tube provides furnace
Whole circular flows of interior and steam-generating bank part tedge.
On the one hand, the fluid of tedge is during upwards, usually stream-liquid two-phase flow, so that the stream in tedge
Body is liquid-vapor mixture, and the presence of stream-liquid two-phase flow makes the efficiency for affecting tedge heat absorption.
On the other hand, this section of upper drum is exported to from tedge, because the space of this section becomes larger suddenly, the change in space
Change and will lead to quickly flowing upwards out and assemble for gas, therefore spatial variations will lead to the vapour phase (vapour group) of aggregation from tedge position
It sets and enters upper drum, due to gas (vapour) liquid density contrast, air mass leaves adapter tube position and will move rapidly upward, and air mass original space bit
It sets and the liquid of wall surface is pushed away by air mass while will also spring back and hit wall surface rapidly, form impingement phenomenon.Gas (vapour) liquid phase is more not
Continuously, air mass aggregation is bigger, and Impact energy is bigger.Impingement phenomenon will cause biggish noise vibration and mechanical shock, to equipment
It damages.
A variety of rising pipe devices to solve the above problems are also devised in application in front, such as more than 2017102546447
Tubular type, but such device is found in operation, because being to be closely linked between pipe, shape between three root canals
At space A it is relatively small because the convex arc that space A is three root canals is formed, most of area stenosis of space A, meeting
It causes fluid to be difficult to enter through, causes fluid short, to affect the heat exchange of fluid, good current stabilization can not be played and made
With.Simultaneously as more root canal subgroups of above structure are combined, manufacture is difficult.Such as 2017102666326 structures again, although
The structure solves fluid short phenomenon, but there are problems that circulation area is substantially reduced, and leads to the increase of flow resistance.
Such as 2017102949490 annular constant-current device again, constant-current stabilizer uses ring structure in ring structure, causes steady on the whole
Stream device annular space separates unevenly in the circumferential, and because there are ring structures, so that the position of four angles of annular space goes out
The acute angle less than 90 degree is showed, this, which will lead to, has fluid flowing short circuit in the acute angle portion less than 90 degree.
In normal boiler design, tedge and down-comer caliber are essentially identical, do not account for specific pressure and temp variation
The variation of caused caliber.
In view of the above-mentioned problems, the present invention is improved on the basis of invention in front, a kind of new steam copper is provided
Furnace, to solve the problems, such as that tedge down-comer heat absorption efficiency is low.
Summary of the invention
The present invention provides a kind of new steam boilers, to solve the technical issues of front occurs.
To achieve the goals above, technical scheme is as follows:
A kind of steam boiler, including upper drum and lower drum and the tedge being connected between upper drum and lower drum and decline
Pipe, along the direction of decline tube fluid flowing, the caliber of down-comer constantly reduces.
Preferably, along the direction that fluid flows, the amplitude that the caliber of down-comer constantly reduces is increasing.
A kind of steam boiler, including upper drum and lower drum and the tedge being connected between upper drum and lower drum under
Drop pipe, which is characterized in that constant-current stabilizer is set in the tedge, and the constant-current stabilizer is laminated structure, the laminated structure
It is arranged on the cross section of tedge；The constant-current stabilizer is square through-hole and octagon through-hole composition, the square
The side length of through-hole is equal to the side length of octagon through-hole, and four of the square through-hole are when being respectively four different positive eight
The side of shape through-hole, four of octagon through-hole apart from one another by while be respectively four different square through-holes while.
Preferably, the cross section of the tedge is square.
Preferably, gap is arranged in the rising inside pipe wall, the outer end of the constant-current stabilizer is arranged in gap.
Preferably, tedge is welded for multi-segment structure, constant-current stabilizer is arranged in the junction of multi-segment structure.
Preferably, the multiple constant-current stabilizers of setting in tedge, the distance between adjacent constant-current stabilizer is M1, and square is logical
The side length in hole is B1, and the side length of tedge is B2, meets following require:
M1/B2=a*Ln(B1/B2) +b
Wherein a, b are parameters, wherein 1.69 < a < 1.70,4.86 <b < 4.87；
11<B2<46mm；
1.9 < B1 < 3.2mm；
15<M1<31mm。
Preferably, a=1.692, b=4.863.
Preferably, a is smaller and smaller with the increase of B1/B2, b is smaller and smaller.
Preferably, the constant-current stabilizer includes at least one of following two type, the first seed type is square
Center constant-current stabilizer, square through-hole are located at the center of tedge, and second of type is octagon center constant-current stabilizer, and positive eight
Side shape through-hole is located at the center of tedge.
Preferably, the constant-current stabilizer type being disposed adjacent is different.
Preferably, the multiple constant-current stabilizers of setting in tedge, the distance that distance rises tube inlet is H, adjacent current stabilization dress
Spacing between setting is S, S=F1(H), meet following require:
S’<0, S”>0。
Preferably, the multiple constant-current stabilizers of setting in tedge, the distance that distance rises tube inlet is H, constant-current stabilizer
Length is C, C=F2(H), meet following require:
C’>0, C”>0。
Preferably, the multiple constant-current stabilizers of setting in tedge, the distance that distance rises tube inlet is H, constant-current stabilizer
The side length of square through-hole is D, D=F3(H), meet following require:
D’<0, D”>0。
Preferably, groove is arranged in the rising inside pipe wall, the shell of the constant-current stabilizer is arranged in groove, described outer
The inner wall of shell and the aligning inner of tedge.
Compared with prior art, the present invention has the advantage that:
1) setting constantly declined by down-comer, to meet the variation of continually changing fluid volume and pressure, so that
Pressure is evenly distributed on the whole, and heat exchange uniformly, can save material, reduce cost.
2) current stabilization of the Novel structure combined the present invention provides a kind of new-type square through-hole and octagon through-hole
Device, by square and octagon, so that the angle that the side of the square hole and octagon hole that are formed is formed all is big
In being equal to 90 degree, so that fluid can sufficiently flow through each position in each hole, the short of fluid flowing is avoided or reduced
Road.Two-phase fluid is separated into liquid and gas by the constant-current stabilizer of Novel structure by the present invention, and liquid phase is divided into small liquid group,
Gas phase is divided into minute bubbles, inhibits the reflux of liquid phase, promotes gas phase smooth outflow, plays the role of regime flow, has and subtracts
The effect of vibration noise reduction, improves heat transfer effect.Constant-current stabilizer in compared with the existing technology further increases steady flow result, strengthens
Heat transfer, and be simple to manufacture.
3) present invention is by being reasonably laid out, so that square and octagon through-hole are evenly distributed, so that whole
On rank street face on fluid segmentation uniformly, avoid the segmentation of ring structure in the prior art circumferentially and unevenly ask
Topic.
4) present invention is uniformly distributed by the interval of square hole and octagon hole, so that macropore and aperture are whole
Body is evenly distributed on cross section, and by the change in location of the macropore of adjacent constant-current stabilizer and aperture, so that segregation
More preferably.
5) present invention is laminated structure by setting constant-current stabilizer, so that constant-current stabilizer structure is simple, cost is reduced.
6) hole that the present invention passes through the distance, constant-current stabilizer that are arranged between adjacent constant-current stabilizer in tedge short transverse
Side length, the parameters size such as caliber, the tube spacing of tedge rule variation, have studied the optimal relationship ruler of above-mentioned parameter
It is very little, to further reach steady flow result, noise is reduced, improves heat transfer effect.
7) present invention widely grind by heat exchange rule caused by the variation to annular constant-current device parameters
Study carefully, when meeting flow resistance, realizes the best relation formula of the effect of vibration and noise reducing.
Detailed description of the invention
Fig. 1 is steam boiler structural schematic diagram of the invention；
Fig. 2 is another embodiment schematic diagram of steam boiler structure of the invention；
Fig. 3-1 constant-current stabilizer cross-sectional structure schematic diagram of the present invention；
Fig. 3-2 another structural schematic diagram of constant-current stabilizer cross section of the present invention；
Fig. 4 is constant-current stabilizer of the present invention arrangement schematic diagram in tedge；
Fig. 5 is the schematic diagram of constant-current stabilizer of the present invention cross sectional arrangement in tedge.
In figure: 1, upper drum, 2, lower drum, 3, tedge, 4, constant-current stabilizer, 41 shells, 42 pipes, 5, down-comer, 6
Down-comer, 7 lower drums, 8 tedges, 9 tedges, 10 fire box, 11 outlet headers, 12 flues.
Specific embodiment
Specific embodiments of the present invention will be described in detail with reference to the accompanying drawing.
Herein, if without specified otherwise, it is related to formula, "/" indicates that division, "×", " * " indicate multiplication.
A kind of steam boiler as described in Figure 1, including upper drum 1 and lower drum 2, the tedge 3 and down-comer 5 connect
Upper drum 1 and lower drum 2.Water enters in down-comer 5 from upper drum 1.Water flows downward in the downcomer, and is collected in and cooks
In cylinder 2.The tedge 3 of boiler is heated by the burning of fuel in fire box 10.Made in pipe by the heat that tedge 3 absorbs
Liquid boiling, thus generate the two-phase mixture of water and vapour.Two-phase mixture in tedge 3 reaches upper drum 1.From upper pot
The water supplying pipe (not shown) subcooled water released and the saturated liquid released from separator in cylinder 1 mix to be formed
Cold liquid, subcooled liquid flow out upper drum 1 and enter down-comer 5, just complete a flow circuit according to such process.
The further steam boiler of another embodiment as described in Figure 2, including upper drum 1 and lower drum 2, the rising
Pipe 3 and down-comer 5 connect upper drum 1 and lower drum 2.Water enters steam-generating bank of being heated in smokejack 12 in furnace from upper drum 1
In down-comer 5.Water flows downward in the downcomer, and is collected in lower drum 2.Since down-comer 5 absorbs heat, so
The temperature for entering the water in lower drum 2 increases.According to the number of absorbed heat, the water in lower drum 2 can be supercooling or
Person's saturation.Fluid (general steam water interface) a part for leaving lower drum 2 flows upwardly into the tedge 3 of steam-generating bank.
The liquid for flowing upwardly into tedge 3 absorbs heat and enters upper drum 1.
The fluid a part for leaving lower drum 2 reaches burner hearth lower drum 7 by down-comer 6.Enter the liquid of a lower drum 7
Body is distributed in each boiler tube 8 being connected with the lower drum 7.Boiler tube is heated by the burning of fuel in fire box 10.By furnace
The heat that pipe 8 absorbs makes the liquid boiling in boiler tube 8, thus generates the two-phase mixture of water and vapour.Two-phase mixtures in boiler tube 8
Object or the boiler tube 8 by being directly connected to upper drum 1 reach upper drum 1, the namely tedge of boiler tube 8 at this time, Huo Zhe
Outlet header 11 be arranged in lower drum 7 and upper drum 1 so far, by intermediate tedge 9 by two-phase mixture from burner hearth circuit out
Mouth header 11 is transmitted to upper drum 1.Inside separator in upper drum 1 separates two-phase mixture into vapour and water.From upper
The water supplying pipe (not shown) subcooled water released and the saturated liquid released from separator in drum 1 mix to be formed
Subcooled liquid, subcooled liquid flow out upper drum 1 and enter down-comer 5, just complete a flow circuit according to such process.
The steam-generating bank of steam boiler, the selected burner hearth furnace wall washed away by combustion-gas flow and convection current furnace wall are come
Say, it is desirable that guarantee a critical inputs heat so that fluid in tube bank and convection current furnace wall circuit in all pipe sufficiently to
Upper circulation and the unstability that will not occur flowing.
Constant-current stabilizer 4, the constant-current stabilizer 4 such as Fig. 3 are set in the tedge 3 and/or tedge 8 and/or tedge 9
Shown, the structure of the constant-current stabilizer 4 is as shown in Fig. 3-1,3-2.The constant-current stabilizer 4 is laminated structure, the laminated structure
It is arranged on the cross section of tedge 3；The constant-current stabilizer 4 be square with octagon structure composition, to form pros
Shape through-hole 41 and octagon through-hole 42.The side length of square through-hole 41 as described in Figure 1 is equal to the side length of octagon through-hole 42,
Four of the square through-hole while 43 be respectively four different octagon through-holes while 43, positive eight deformation four of through-hole
Apart from one another by while 43 be respectively four different square through-holes while 43.
The present invention uses the constant-current stabilizer of Novel structure, has the advantages that
1) constant-current stabilizer of the Novel structure combined the present invention provides a kind of new-type square through-hole and octagon through-hole,
By square and octagon, so that the angle that the side of the square hole and octagon hole that are formed is formed all is greater than and is equal to
90 degree, so that fluid can sufficiently flow through each position in each hole, avoid or reduce the short circuit of fluid flowing.This hair
It is bright that two-phase fluid is separated by liquid and gas by the constant-current stabilizer of Novel structure, liquid phase is divided into small liquid group, by gas phase
Minute bubbles are divided into, the reflux of liquid phase is inhibited, promotes gas phase smooth outflow, plays the role of regime flow, there is vibration and noise reducing
Effect, improve heat transfer effect.Constant-current stabilizer in compared with the existing technology, further increases steady flow result, augmentation of heat transfer, and
And it is simple to manufacture.
2) present invention is by being reasonably laid out, so that square and octagon through-hole are evenly distributed, so that whole
On rank street face on fluid segmentation uniformly, avoid the segmentation of ring structure in the prior art circumferentially and unevenly ask
Topic.
3) present invention is uniformly distributed by the interval of square hole and octagon through-hole, so that macropore and aperture exist
It is evenly distributed on whole cross section, and by the change in location of the macropore of adjacent constant-current stabilizer and aperture, so that separating effect
Fruit is more preferable.
4) present invention is laminated structure by setting constant-current stabilizer, so that constant-current stabilizer structure is simple, cost is reduced.
The present invention is equivalent to by setting annular constant-current device and increases interior heat exchange area in tedge, enhanced and changed
Heat improves heat transfer effect.
The present invention is because all cross-section locations by gas-liquid two-phase in all tedges are divided, thus entire
Rise and realize the segmentation of gas-liquid interface and gas phase boundary and the contact area of cooling wall on tube section and enhance disturbance, greatly
Big reduces noise and vibration, enhances heat transfer.
Mentioned tedge below, is all at least one of tedge 3, tedge 8 and tedge 9.
The present invention is equivalent to by setting square and octagon constant-current stabilizer and increases inner fin in tedge 3, by force
Change heat exchange, improves heat transfer effect.
The present invention is because all cross-section locations by vehicle repair major in tedge 3 are divided, thus on entire
The segmentation of liquid-vaqor interface and vapour phase boundary layer and the contact area of cooling wall are realized on riser cross section and enhances disturbance, significantly
Reduce noise and vibration, enhance heat transfer.
Preferably, the constant-current stabilizer includes two types, as shown in figure 3-1, the first seed type is square center
Constant-current stabilizer, square are located at the center of tedge or down-comer, as shown in figure 3-2.Second is that octagon center is steady
Device is flowed, octagon is located at the center of tedge or down-comer, as shown in figure 3-1.Preferably as one, above two class
The constant-current stabilizer of type is disposed adjacent, that is, the constant-current stabilizer type being disposed adjacent is different.It is i.e. adjacent with square center constant-current stabilizer
Be octagon center constant-current stabilizer, adjacent with octagon center constant-current stabilizer is square center constant-current stabilizer.This
Invention is uniformly distributed by the interval of square hole and octagon hole, so that macropore and aperture divide on whole cross section
Cloth is uniform, and by the change in location of the macropore of adjacent constant-current stabilizer and aperture, so that the fluid by macropore is following
By aperture, by the fluid of aperture followed by macropore, further progress separates, and promotes the mixing of vapour-liquid, so that separating
It is more preferable with heat transfer effect.
Preferably, the cross section of the tedge 3 is square.
Preferably, along the direction that fluid flows, the caliber of tedge 3 constantly increases.Main cause is as follows: 1) leading to
Cross the caliber for increasing tedge, it is possible to reduce the resistance of flowing, so that the steam for rising in-tube evaporation constantly increases towards caliber
The direction movement added, to further promote circulating for loop circuit heat pipe.2) because of the continuous flowing with fluid, liquid
It is constantly evaporated in tedge, so that steam volume is increasing, pressure is also increasing, therefore by increasing caliber
Meet the variation of ever-increasing steam volume and pressure, so that pressure is evenly distributed on the whole.3) pass through tedge
Caliber increase, it is possible to reduce steam outlet volume increase caused by impact phenomenon.
Preferably, constantly increased amplitude is increasing for the caliber of tedge 3 along the direction that fluid flows.On
The amplitude variation for stating caliber is that the applicant obtains with numerical simulation through a large number of experiments as a result, by above-mentioned setting,
Circulating for loop circuit heat pipe can further be promoted, it is integrally uniform to reach pressure, reduces impact phenomenon.
Preferably, setting is more in tedge 3 along the flow direction (i.e. the short transverse of Fig. 3) of fluid in tedge 3
A constant-current stabilizer 4, from the entrance of tedge to the outlet of tedge, the distance between adjacent constant-current stabilizer is shorter and shorter.If away from
It is H with a distance from tube inlet from rising, the spacing between adjacent constant-current stabilizer is S, S=F1(H), i.e. S is using distance H as variable
Function, S ' are the first order derivatives of S, meet following require:
S’<0;
Main cause is because the steam in tedge understands carrier's liquid, in uphill process, tedge in uphill process
It is continuous heated, cause the steam in biphase gas and liquid flow more and more, because the vapour phase in stream-liquid two-phase flow is more and more, rises
Exchange capability of heat in pipe can increase with vapour phase and weaken relatively, and vibration and its noise also can constantly increase as vapour phase increases
Add.Therefore the distance between the adjacent constant-current stabilizer for needing to be arranged is shorter and shorter.
In addition, this section of outlet header 11 is exported to from tedge 8, also from tedge 9 and 3 to this section of upper drum 1,
Because the space of this section becomes larger suddenly, the variation in space will lead to quickly flowing upwards out and assemble for gas, therefore space becomes
The vapour phase (vapour group) that change will lead to aggregation enters condensation collector from tedge position, and due to gas (vapour) liquid density contrast, air mass is left
Adapter tube position will move rapidly upward, and air mass original spatial position is pushed away the liquid of wall surface while will also be sprung back rapidly simultaneously by air mass
Wall surface is hit, impingement phenomenon is formed.Gas (vapour) liquid phase is more discontinuous, and air mass aggregation is bigger, and water hammer energy is bigger.Impingement phenomenon meeting
Biggish noise vibration and mechanical shock are caused, equipment is damaged.Therefore it in order to avoid the generation of this phenomenon, sets at this time
The distance between the adjacent constant-current stabilizer set is shorter and shorter, thus constantly separate gas phase and liquid phase in fluid delivery process,
To reduce vibration and noise to the full extent.
It is found through experiments that, by above-mentioned setting, can both reduce vibration and noise to the full extent, while can mention
High heat transfer effect.
Further preferably, from the entrance of tedge to the outlet of tedge, the distance between adjacent constant-current stabilizer is increasingly
Short amplitude is continuously increased.That is S " is the second derivative of S, meets following require:
S”>0;
It is found through experiments that, by so set, 9% or so vibration and noise can be further decreased, while it is left to improve 7%
Right heat transfer effect.
Preferably, the length of each constant-current stabilizer 4 remains unchanged.
Preferably, other than the distance between adjacent constant-current stabilizer 4, constant-current stabilizer others parameter (such as caliber
Deng) remain unchanged.
Preferably, being set in tedge along the flow direction (i.e. along tedge extending direction) for rising tube fluid
Multiple constant-current stabilizers are set, from the entrance of tedge to the outlet of tedge, the square of the constant-current stabilizer in different constant-current stabilizers 4
The side length of through-hole is smaller and smaller.I.e. the side length of the square through-hole of constant-current stabilizer is D, D=F3(X), D ' is the first order derivative of D, full
Foot is following to be required:
D’<0;
Preferably, from the entrance of tedge to the outlet of tedge, the side length of the square through-hole of constant-current stabilizer is smaller and smaller
Amplitude be continuously increased.I.e.
D " is the second derivative of D, meets following require:
D”>0。
The variation of the distance between for example adjacent constant-current stabilizer of specific reason is identical.
Preferably, the length of constant-current stabilizer and the distance of adjacent constant-current stabilizer remain unchanged.
Preferably, other than the pipe diameter of constant-current stabilizer, constant-current stabilizer others parameter (such as it is length, adjacent steady
The distance between stream device etc.) it remains unchanged.
Further preferably, as shown in figure 4, gap is arranged inside the tedge, the shell 42 of the constant-current stabilizer 4 is arranged
In gap.
Further preferably, tedge is welded for multi-segment structure, and constant-current stabilizer 4 is arranged in the junction of multi-segment structure.This
Kind mode makes being simple to manufacture for the tedge that constant-current stabilizer is arranged, and cost reduces.
It is learnt by analyzing and testing, the spacing between constant-current stabilizer cannot be excessive, leads to damping noise reduction if excessive
Effect it is bad, while can not be too small, cause resistance excessive if too small, similarly, square side length can not it is excessive or
Person is too small, and the effect for also resulting in damping noise reduction is bad or resistance is excessive, therefore the present invention is through a large number of experiments, preferential
Meet normal flow resistance (total pressure-bearing be 2.5Mpa hereinafter, single riser on-way resistance be less than or equal to 5Pa/M)
In the case where, so that being optimal of damping noise reduction, has arranged the optimal relationship of parameters.
Preferably, the distance between adjacent constant-current stabilizer is M1, the side length of square through-hole is B1, and tedge is pros
Tee section, the side length of tedge square section are B2, meet following require:
M1/B2=a*Ln(B1/B2) +b
Wherein a, b are parameters, wherein 1.69 < a < 1.70,4.86 <b < 4.87；
11<B2<46mm；
1.9 < B1 < 3.2mm；
15<M1<31mm。
Preferably, a=1.692, b=4.863.
Further preferably, with the increase of B1/B2, a is smaller and smaller, and b is increasing.
Preferably, the side length B1 of square through-hole is the average value of side length and outer side length in square through-hole, tedge
The side length B2 of square section is the average value of side length and outer side length in tedge.
Preferably, the outer side length of square through-hole is equal to the interior side length of tedge square section.
Preferably, with the increase of B2, B1 is also continuously increased.But with the increase of B2, the ever-increasing amplitude of B1
It is smaller and smaller.This rule variation is obtained by a large amount of numerical simulation and experiment, and the variation of above-mentioned rule, Neng Goujin are passed through
One step improves heat transfer effect, reduces noise.
Preferably, with the increase of B2, M1 constantly reduces.But with the increase of B2, the ever-reduced amplitude of M1 is got over
Come smaller.This rule variation is obtained by a large amount of numerical simulation and experiment, can be into one by the variation of above-mentioned rule
Step improves heat transfer effect, reduces noise.
It is learnt by analyzing and testing, the spacing of tedge will also meet certain requirements, such as cannot excessive or mistake
It is small, no matter it is too large or too small all heat transfer effect can be caused bad, and because the application tedge in be provided with constant-current stabilizer,
Therefore constant-current stabilizer also there are certain requirements rising tube spacing.Therefore the present invention through a large number of experiments, meets normally preferential
Flow resistance (total pressure-bearing be 2.5Mpa hereinafter, single riser on-way resistance be less than or equal to 5Pa/M) in the case where,
So that being optimal of damping noise reduction, has arranged the optimal relationship of parameters.
The distance between adjacent constant-current stabilizer is M1, and square side length is B1, and tedge is square section, tedge
Side length be B2, the adjacent spacing risen between tube hub is that M2 meets following require:
M2/B2=d*(M1/B2)2+e+f*(M1/B2)3-h*(M1/B2)；
Wherein d, e, f, h are parameters,
1.249<d<1.252,1.495<e<1.510,0.39<f<0.40,0.920<h<0.930；
11<B2<46mm；
1.9 < B1 < 3.2mm；
15<M1<31mm。
16<M2<76mm。
Spacing between adjacent rising tube hub is that M2 refers to the distance between rising tube hub line.
Further preferably, d=1.2511, e=1.508, f=0.396, h=0.923；
Preferably, d, e, f is increasing with the increase of M1/B2, h is smaller and smaller.
Preferably, M2 is continuously increased with the increase of B2, but with the increase of B2, the ever-increasing amplitude of M2 is got over
Come smaller.This rule variation is obtained by a large amount of numerical simulation and experiment, can be into one by the variation of above-mentioned rule
Step improves heat transfer effect.
Preferably, being also provided with constant-current stabilizer 4 in the down-comer.The optimization and rising of the setting of spacing between down-comer
It manages identical.
Preferably, tedge or decline length of tube L are between 4000-5500mm.Further preferably, 4200-
Between 4800mm.
By the preferred of the optimal geometric scale of above-mentioned formula, can be realized under the conditions of meeting normal flow resistance,
Damping noise reduction reaches optimum efficiency.
For parameters such as other parameters, such as tube wall, shell wall thickness according to normal standard setting.
Preferably, correction factor c can be increased to data when the angle that tedge and horizontal plane are formed is A
It is modified, i.e.,
c* M1/B2=a*Ln(B1/B2) +b；c=1/sin(A)m, wherein 0.09 < m < 0.11, preferably m=0.10.
20 ° < A < 80 °, preferably 40-60 °.
Preferably, the caliber of the tedge is greater than the caliber of down-comer.The resistance for mainly increasing down-comer, reduces
The resistance of tedge, so that steam is easier from evaporation part flowing, loop circuit heat pipe preferably forms circulation.
Preferably, the cross section of the down-comer is square.
Preferably, along the direction that fluid flows, the caliber of down-comer constantly reduces.Main cause is as follows: 1) because
For with the continuous flowing of fluid, liquid constantly condenses in down-comer, so that fluid volume is smaller and smaller, pressure
Also smaller and smaller, therefore meet the variation of ever-increasing fluid volume and pressure by reducing caliber, so that whole
Upper pressure is evenly distributed, and heat exchange is uniform.2) by the reduction of the caliber of absorbing pipe, material can be saved, cost is reduced.
Preferably, along the direction that fluid flows, the amplitude that the caliber of down-comer constantly reduces is increasing.It is above-mentioned
The amplitude variation of caliber is that the applicant obtains with numerical simulation through a large number of experiments as a result, by above-mentioned setting, energy
Circulating for enough further promotion loop circuit heat pipes, it is integrally uniform to reach pressure.
Although the present invention has been disclosed in the preferred embodiments as above, present invention is not limited to this.Any art technology
Personnel can make various changes or modifications, therefore protection scope of the present invention is answered without departing from the spirit and scope of the present invention
When being defined by the scope defined by the claims..
Claims (5)
1. a kind of steam boiler, including upper drum and lower drum and the tedge being connected between upper drum and lower drum and decline
Pipe, which is characterized in that along the direction of decline tube fluid flowing, the caliber of down-comer constantly reduces.
2. boiler as described in claim 1, which is characterized in that along the direction that fluid flows, the caliber of down-comer is continuous
Reduced amplitude is increasing.
3. boiler as described in claim 1, which is characterized in that constant-current stabilizer, the constant-current stabilizer are arranged in the tedge
It is laminated structure, the laminated structure is arranged on the cross section of tedge；The constant-current stabilizer is square through-hole and positive eight
Side shape through-hole composition, the side length of the square through-hole are equal to the side length of octagon through-hole, and four of the square through-hole
While be respectively four different octagon through-holes while, four of octagon through-hole apart from one another by side be respectively four not
The side of same square through-hole.
4. boiler as described in claim 1, which is characterized in that the cross section of the tedge is square.
5. a kind of steam boiler, including upper drum and lower drum and the tedge being connected between upper drum and lower drum and decline
Pipe, which is characterized in that constant-current stabilizer is set in the tedge, and the constant-current stabilizer is laminated structure.
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| CN201810632537.8A CN110067993B (en) | 2018-06-20 | 2018-06-20 | Steam boiler with variable pipe diameter of downcomer |
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| CN201810632537.8A CN110067993B (en) | 2018-06-20 | 2018-06-20 | Steam boiler with variable pipe diameter of downcomer |
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|---|---|---|---|---|
| NL158604B (en) * | 1966-08-16 | 1978-11-15 | Vorkauf Heinrich | WATERPIPE BOILER. |
| JPS54112401A (en) * | 1978-02-23 | 1979-09-03 | Toshiba Corp | Steam generator |
| CN2146655Y (en) * | 1993-02-19 | 1993-11-17 | 化工部化工机械研究院 | Secondary quenching boiler |
| CN202065991U (en) * | 2011-02-25 | 2011-12-07 | 程德荣 | Pipe laying structure for improving water circulation of horizontal boiler |
| CN105758016A (en) * | 2016-03-15 | 2016-07-13 | 赵炜 | Solar thermal collector characterized by regular change of sizes of collector tubes |
| CN107062187A (en) * | 2017-04-21 | 2017-08-18 | 青岛金玉大商贸有限公司 | A kind of steam boiler of through hole diameter change |
| CN107143837A (en) * | 2017-04-18 | 2017-09-08 | 青岛金玉大商贸有限公司 | A kind of damping steam boiler |
-
2018
- 2018-06-20 CN CN201810632537.8A patent/CN110067993B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL158604B (en) * | 1966-08-16 | 1978-11-15 | Vorkauf Heinrich | WATERPIPE BOILER. |
| JPS54112401A (en) * | 1978-02-23 | 1979-09-03 | Toshiba Corp | Steam generator |
| CN2146655Y (en) * | 1993-02-19 | 1993-11-17 | 化工部化工机械研究院 | Secondary quenching boiler |
| CN202065991U (en) * | 2011-02-25 | 2011-12-07 | 程德荣 | Pipe laying structure for improving water circulation of horizontal boiler |
| CN105758016A (en) * | 2016-03-15 | 2016-07-13 | 赵炜 | Solar thermal collector characterized by regular change of sizes of collector tubes |
| CN107143837A (en) * | 2017-04-18 | 2017-09-08 | 青岛金玉大商贸有限公司 | A kind of damping steam boiler |
| CN107062187A (en) * | 2017-04-21 | 2017-08-18 | 青岛金玉大商贸有限公司 | A kind of steam boiler of through hole diameter change |
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| Publication number | Publication date |
|---|---|
| CN110067993B (en) | 2020-06-16 |
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