CN206656337U - A kind of membrane type steam-generating tube - Google Patents
A kind of membrane type steam-generating tube Download PDFInfo
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- CN206656337U CN206656337U CN201720235822.7U CN201720235822U CN206656337U CN 206656337 U CN206656337 U CN 206656337U CN 201720235822 U CN201720235822 U CN 201720235822U CN 206656337 U CN206656337 U CN 206656337U
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- 239000012528 membrane Substances 0.000 title claims abstract description 22
- 238000001704 evaporation Methods 0.000 claims abstract description 67
- 230000008020 evaporation Effects 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 239000004744 fabric Substances 0.000 claims abstract description 16
- 239000007791 liquid phase Substances 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000012808 vapor phase Substances 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 238000009834 vaporization Methods 0.000 claims description 21
- 230000008016 vaporization Effects 0.000 claims description 21
- 239000012071 phase Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000009835 boiling Methods 0.000 description 27
- 239000008234 soft water Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
It the utility model is related to membrane type steam-generating tube, fed water by top and distribute cloth film section, middle part film-type evaporation section and bottom vapor-liquid separation section composition, top feedwater distribution cloth film section includes filming device, control feedwater feedstock direction and inlet amount make along wall film forming, or the uniform cloth film of equal membrane device reallocation is combined, liquid film is contacted heating surface along wall with moisture film shape stream under initial flow rate and Action of Gravity Field.Middle part film-type evaporation section, heat pipe provide heat energy to radiate in pipe external heat source with convection current conduction pattern, and the liquid film entirety thermally equivalent of flowing absorbs carburation by evaporation after heat energy, and steam is diffused into tube hub space.Bottom vapor-liquid separation section is made up of vapor phase exit and liquid-phase outlet, and both directions and height are differently formed steam stream and fluid course.With heat transfer efficiency is high, heat transfer is stable, effective carburation by evaporation face is big, heat pipe temperature is low, the high major advantage of evaporation efficiency.
Description
Technical field
It the utility model is related to steam generating equipment technical field, and in particular to a kind of membrane type steam-generating tube.
Background technology
The energy has critical role in national economy life, and all trades and professions all be unable to do without the energy.Industrial water steam（One
Steam is referred to as down）It is a kind of main energy carrier（Heat energy, potential energy, kinetic energy）；By industrial soft water（That is boiler feedwater, referred to as
Feedwater）Steam is changed under certain condition；Steam production equipment be mainly Industrial Boiler, by Industrial Boiler by coal, combustion
The various fuel such as gas, fuel oil or biomass are converted into heat energy by chemical energy, and industrial soft water is vaporizated into high temperature height by low temperature liquid
Steam is pressed, is that production equipment, facility and living facilities etc. provide heat energy and kinetic energy（Potential energy）；The generator of power plant is it by boiler
Steam turbine provides potential energy heat energy, and electric energy is converted into generating set.So the Industrial Boiler as production steam is raw in industry
Play an important roll in production.
The vapor form to be fed water in existing industrial pot in stove heat pipe mainly has drum formula boiling vaporization, circulating boiling
Rise vaporization, single flow boiling vaporization（Horizontal type, vertical-type, horizontal vertical mixed type）Three kinds of forms, as shown in accompanying drawing 1 to 6
Five kinds of situations.It is drum boiler shown in accompanying drawing 1, working medium（Industrial soft water）In drum, burnt by fuel oil or gas furnace
Room combustion heat supplying, to drum radiant heating in combustion chamber, in tubulation high temperature tail gas to working medium Convective Heating outside tubulation；It is heated
Feedwater heats up after absorbing heat energy in pipe, when temperature exceedes its institute's boiling point under stress, seethes with excitement and is vaporized into steam.Accompanying drawing
2 be nature（Or force）Circulation boiler, working medium（Industrial soft water）In heating tubulation and drum, main heating part is decline
Heat pipe and rising heat pipe, the intraductal working medium that is heated in combustion chamber are mainly heated with radiation mode, work in remaining heat pipe
Matter is mainly heated in the form of heat convection；Feedwater absorbs heat energy heating in heat pipe, when temperature exceed its under stress
When boiling point, boiling is vaporized into steam.Drum of two kinds of boilers because all carrying huge steam-water separation shown in Fig. 1 and 2,
It is referred to as drum formula boiler.It is respectively spirally wound tubes formula shown in accompanying drawing 3 to 6, rewinds pipeloop formula and vertical tube Folding-Screen formulas are straight
Boiler is flowed, direct current cooker is not used for the drum of steam-water separation, and industrial soft water is pressurizeed by high-pressure hydraulic pump and done work, and water is flat or vertical
Be forced to quickly propel in straight heat pipe, pipe external heat source by radiate with convection current in the form of heated to being fed water in pipe, feedwater is heated to form
HTHP hot water；In direct current cooker outlet section, heated overpressure drops to the saturated vapor pressure of intraductal working medium water temperature, in pipe
High-temperature-hot-water is vaporized in the form of crossing flash evaporation and boiling；Steam after vaporization is still heated into superheated steam.
No matter the boiling of cooking-pot type cartridge type vaporizes, circulating boiling vaporizes, single flow boiling vaporization（Horizontal type, vertical-type, level
Vertical mixed type）, their common feature：Heat pipe is heated in the case where filling feedwater, where feed temperature exceedes it
In the case of pressure saturation boiling point, then vaporized in the form of flashing and seething with excitement.The steam come is vaporized with to be wrapped in by liquid（Especially exist
In drum formula boiler heat pipe）, its vapor-liquid separation interface is that liquid interface cross section limits in heat pipe or drum（Or heat pipe
The limited evaporating surface limitation of evaporator section）, govern intraductal working medium boil-off rate；In drum formula boiler, with heat transfer temperature difference
Increasing, can exist the first kind boiling deteriorate, as shown in Figure 8, when in heat pipe boiling water acutely to a certain extent, water
Heat transfer is obstructed by air film, and the heat transfer between tube wall and feedwater drastically declines；Saturation water shown in accompanying drawing 7 is on horizontal heating surface
The typical curve of boiling, feed water and vaporize situation in drum formula boiler：About 4~40 DEG C of the temperature difference between wall temperature and working medium boiling point
When, it is nucleate boiling area；The Evaporating Heat Transfer speed for rising working medium in this area with the temperature difference constantly rises, speed of nearby being conducted heat at about 40 DEG C
Rate reaches a high point, the unit different transfer of heat speed of water（That is heat transfer coefficient）About 29000W/（m2·℃）.Temperature is improved again
Difference, heat transfer enter transient boiling range；Feed-water flashing rate of heat transfer rises with the temperature difference and declined on the contrary in this area, is risen in the temperature difference
Near 200 DEG C, Evaporating Heat Transfer coefficient is reduced to about 1000W/（m2·℃）；The temperature difference is improved again, and heat transfer enters stable film boiling
Area, it is horizontal that heat transfer coefficient maintains essentially in this.In the case of no boiling vaporization, the heat transfer coefficient of water has been only about boiling vapour
1/5 in the case of change, the heat transfer coefficient of water vapour is only about the 1/15 ~ 1/25 of water.In once-through boiler, due to no vapour-liquid
The drum of separation and cyclic process, feed water and be disposably heated, vaporize in heat pipe, overheating into steam, the stroke that is heated is very long；
So heat pipe must be accomplished to grow very much；Which limits direct current cooker to be only used for the boiler of power plant that maximizes.Due to single flow pot
The heated tubulation stroke of stove is certain, necessary strict match control of fuel supply and feedwater of direct current cooker, otherwise, output steam
It is unqualified, can also be because of high temperature injury heat pipe；There is the second class boiling deterioration in direct current cooker, as shown in Figure 9, when heated
Steam quality reaches to a certain degree in steam water interface in pipe, and intraductal working medium fluidal texture is the vapour column of ring moisture film, and moisture film is very thin,
Feedwater is vaporized in the form of flashing and seething with excitement in pipe, and there is pulsation phenomenon, local area moisture film to be broken through or be steamed by air-flow
Dry, tube wall cannot be cooled down, and heat transfer coefficient is decreased obviously.When the second class is seethed with excitement and deteriorates generation, heat pipe wall temperature steeply rises,
500 ~ 700 DEG C can be reached, even more high, the general using limit of heat pipe material is exceeded well over, cause heat pipe to damage or use
Life-span die-offs.
In summary it is described：In drum formula boiler and the heat pipe of direct current cooker formula working medium soft water be heated vaporization have it is following not
Foot：
1st, heat transfer efficiency is low, and in drum formula boiler and direct current cooker heat pipe, working-medium water is in different phase heat transfer coefficient
It is different, only in nucleate boiling vaporization section heat transfer coefficient highest, limit the raising of rate of heat transfer；
2nd, conduct heat unstable, boiling corruptions be present, first kind boiling can occur in drum formula boiler heat pipe and dislike
Change, the second class boiling deterioration can occur in once-through boiler heat pipe；
3rd, effective carburation by evaporation area is small, in drum formula boiler heat pipe, working medium part in heat pipe is risen（About
10%）Boiling vaporization, the steam after vaporization are wrapped up by water, steam water interface mass-and heat-transfer, separated again after rising to drum again；
In direct current cooker heat pipe, HTHP hot water, it could flashed close to heat pipe endpiece and vaporization of seething with excitement；Only in heat pipe
The limited surface vaporization of phase near interface, effective vaporization area are small；
4th, heat pipe temperature is high, and reason, will reach same evaporation rate in view of the above, it is necessary to increase working medium vapour
The liquid phase temperature difference carrys out quasi-complement；Same heating surface, the saturated vapor of same quality and pressure is produced, heat pipe temperature is far above direct
The lower heat pipe temperature of evaporation；
5th, evaporation efficiency is low, and for these reasons, at a temperature of same heat pipe, dum boiler is identical with direct current cooker
The heat pipe production ad eundem saturated vapor ability of area is steamed ability far below directly by the heat pipe of thermal evaporation.
Utility model content
The purpose of this utility model is to overcome heat transfer efficiency existing for the heated tubulation of boiler of existing production steam unit
A kind of low, deficiency such as heat transfer is unstable, effective carburation by evaporation face is small, heat pipe temperature is high, evaporation efficiency is low, there is provided heat transfer efficiency
Height, heat transfer is stable, effective carburation by evaporation face is big, a kind of membrane type steam-generating tube that heat pipe temperature is low, evaporation efficiency is high.
The technical scheme in the invention for solving the above technical problem is：A kind of membrane type steam-generating tube, it is by top
Feedwater distribution cloth film section, middle part film-type evaporation section and bottom vapor-liquid separation section composition.
Wherein, top feedwater distribution cloth film section includes filming device, and feedwater feedstock direction and charging are controlled by the filming device
Amount makes, directly along wall film forming, or the uniform cloth film of the equal membrane device reallocation of combination, to make liquid film in initial flow rate and Action of Gravity Field lower edge
Wall contact heating surface is flowed down with uniform moisture film shape.
Middle part film-type evaporation section, heat pipe provide heat energy to radiate in pipe external heat source with convection current conduction pattern, and liquid film is continuous
Alternately flow so that liquid film entirety thermally equivalent, feedwater absorb heat energy after it is direct by liquid phase carburation by evaporation, the vapour phase steam of vaporization
Heat pipe central space is diffused into, without overcoming the resistance of liquid phase moisture film.
Bottom vapor-liquid separation section is made up of vapor phase exit and liquid-phase outlet, and vapor phase exit is opened on the top of liquid-phase outlet
Mouth direction is different；Vapor guides with unboiled water to different directions, forms steam stream and fluid course.Vapour-liquid is avoided to mix
Influence each other, in favor of the steam in the confined space and water quick separating and circulation.Phase is efficiently separated there is sufficient space
In the case of, this bottom segregation section can be omitted, and water vapour and water are directly exported by evaporation tube.
The filming device of the application mainly has several forms：Plate hole formula filming device, pitting filming device, plate ring type filming device and
Spiral filming device.
Plate hole formula filming device is to be distributed 2~20 inlet openings, water inlet downwards along heat pipe tangential direction on the shrouding of top
Hole is circular, square or rectangle, and its sectional area is suitable with 0.5~5mm of Φ circular hole, and the quantity and specification of water inlet are according to this
The evaporation task setting of heat pipe.
Pitting filming device is below the shrouding of top, along the distribution 2~20 downwards of heat pipe tangential direction on heat pipe
Individual inlet opening；Inlet opening can be circular, square or rectangle, and its sectional area is suitable with 0.5~5mm circular hole, inlet opening
Quantity and specification are according to the evaporation task setting of the heat pipe.
Plate ring type filming device be on the shrouding of top to heated tube wall direction set a ring formula water inlet, according to this by
The evaporation load of heat pipe sets lower end discharge ring gap in 0.02~0.5mm.
Spiral filming device is the circle for setting a 0.5~10mm according to the heat pipe evaporation load on the shrouding of top
Hole inlet opening, the circular hole lower end set corresponding specification spiral spray thrower, by top intake with umbrella covering of the fan be ejected into by
Heat pipe inner wall face.
For common job state, the cloth film effect that several filming devices of the above are ejected into the water of wall has reached using mesh
's；Can also be several more than, the filming device lower end increase sets equal film ring, it would be possible to because of the liquid being splashed at a high speed outside wall
Drop is guided to wall so that feedwater is flowed down with ring-shaped liquid film along wall.
Further, the specification of membrane type steam-generating tube is DN20~DN200 boiler special steel pipe, and draw ratio l/d exists
Between 50~200；Length ratio shared by top feedwater distribution cloth film section and bottom vapor-liquid separation section is the 1~2% of entire length,
Water is full of in filming device and with upper bit, all liquid film coverings of the following tubulation inwall of filming device, thickness of liquid film is in 0.05~1mm
Between, thickness of liquid film is average between 0.1~0.2mm under common situation.
Research shows that water speed in carburation by evaporation can be formulated as：m=f×A×Δp；In formula：M is water
Evaporation rate, f are evaporation coefficient, and A is disengagement area, and Δ p is evaporation working medium surface vapor pressure power and gaseous pressure outside surface
Difference.Research shows to be more than 1 × 10 in working medium thickness of liquid film-7During m, influences of the evaporation coefficient f to evaporation rate m is led by liquid film substantially
Thermal resistance（That is heat transfer coefficient）Substituted.And phase saturated vapor pressure difference is then depended between vapour phase saturation point and liquid phase water temperature
Temperature difference.So the factor for determining water evaporation boil-off rate is：The heat transfer coefficient of feed-water flashing, the vapour-liquid of vaporization are separated
Interfacial area, the phase temperature difference of vaporization（Or saturated vapor pressure difference）.
A kind of membrane type steam-generating tube, as the monomer that steams of kestner long-tube evaporator, their system in combination can be straight
Welding is connect, can also be connected through a screw thread.Evaporation tube top filming device is in addition to pitting filming device, plate hole formula filming device, plate ring
Formula filming device and spiral filming device can be detachable, are easy to observe and repair.
Membrane type steam-generating tube of the present utility model is compared with existing drum formula and once-through boiler heat pipe：
Brief description of the drawings
Fig. 1 is drum boiler steam generation structure；
Fig. 1：1 heating tube, 2 combustion chambers
Fig. 2 is nature（Force）Combined-circulation once-through boiler；
Fig. 2：1 drum, 2 downflow heated tubes, 3 headers, 4 rise heat pipe
Fig. 3 is spirally wound tubes formula direct current cooker；
Fig. 3：1 combustion chamber, 2 horizontal heat pipes
Fig. 4 is to rewind pipeloop formula direct current cooker；
Fig. 5 is another structure for rewinding pipeloop formula direct current cooker；
Fig. 4-5：1 horizontal heat pipe, 2 heated vertical pipes, 3 headers
Fig. 6 is Vertical Water-wall Once-through Boiler；
Fig. 6：1 heated vertical pipe, 2, header
Fig. 7 is the typical curve that saturation water seethes with excitement on horizontal heating surface；
Fig. 8 is the structural representation of first kind heat transfer deterioration；
Fig. 9 is the structural representation of the second class heat transfer deterioration；
Figure 10 is the structural representation of the application film-type evaporation；
Figure 11 is steam-generating tube in the embodiment of the present application（Single venthole type）Sectional view；
Figure 12 is steam-generating tube in the embodiment of the present application（Single venthole type）Side view；
Figure 13 is steam-generating tube in the embodiment of the present application（Double venthole types）Sectional view；
Figure 14 is steam-generating tube in the embodiment of the present application（Double venthole types）Side view；
Figure 15 is plate hole formula filming device in the embodiment of the present application（Without equal film ring）Vertical cross-sectional；
Figure 16 is plate hole formula filming device in the embodiment of the present application（Without equal film ring）Transverse sectional view；
Figure 17 is plate hole formula filming device in the embodiment of the present application（With equal film ring）Vertical cross-sectional；
Figure 18 is plate hole formula filming device in the embodiment of the present application（With equal film ring）Transverse sectional view；
Figure 15-18：1 tube wall, 2 distribution grids, 3 inlet openings, 4 equal film rings
Figure 19 is pitting filming device in the embodiment of the present application（Without equal film ring）Vertical cross-sectional；
Figure 20 is pitting filming device in the embodiment of the present application（Without equal film ring）Transverse sectional view；
Figure 21 is pitting filming device in the embodiment of the present application（With equal film ring）Vertical cross-sectional；
Figure 22 is pitting filming device in the embodiment of the present application（With equal film ring）Transverse sectional view；
Figure 19-22：1 tube wall, 2 shroudings, 3 inlet openings, 4 equal film rings
Figure 23 is plate ring type filming device in the embodiment of the present application（Without equal film ring）Vertical cross-sectional；
Figure 24 is plate ring type filming device in the embodiment of the present application（Without equal film ring）Transverse sectional view；
Figure 25 is plate ring type filming device in the embodiment of the present application（With equal film ring）Vertical cross-sectional；
Figure 26 is plate ring type filming device in the embodiment of the present application（With equal film ring）Transverse sectional view；
Figure 23-26：Water ring, 4 equal film rings are entered in 1 tube wall, 2 distribution grids, 3
Figure 27 is spiral filming device in the embodiment of the present application（Without equal film ring）Vertical cross-sectional；
Figure 28 is spiral filming device in the embodiment of the present application（Without equal film ring）Transverse sectional view；
Figure 29 is spiral filming device in the embodiment of the present application（With equal film ring）Vertical cross-sectional；
Figure 30 is spiral filming device in the embodiment of the present application（With equal film ring）Transverse sectional view；
Figure 27-30：1 tube wall, 2 distribution grids, 3 inlet openings, 4 equal film rings, 5 spray heads, 6 gussets, 7 balance pipes.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in Figure 11 to 14, the membrane type steam-generating tube in the present embodiment, it is fed water by top and distributes cloth film section I, in
Portion film-type evaporation section II and bottom vapor-liquid separation section III compositions.
Top feedwater distribution cloth film section I includes filming device 1, controls feedwater feedstock direction and inlet amount to make directly by filming device 1
Connect along wall film forming, liquid film is contacted heating surface along wall with uniform moisture film shape stream under initial flow rate and Action of Gravity Field.
Middle part film-type evaporation section II, heat pipe provide heat energy, inside pipe wall to radiate in pipe external heat source with convection current conduction pattern
Liquid film constantly alternately flow so that liquid film entirety thermally equivalent, feedwater absorb heat energy after by liquid phase carburation by evaporation, the steaming of vaporization
Vapour is directly diffused into heat pipe central space, and without overcoming the resistance of liquid phase moisture film, steam drills conduit running with liquid film.
Bottom vapor-liquid separation section III is made up of vapor phase exit a and liquid-phase outlet b, and vapor phase exit and liquid-phase outlet can be set
More than one is put, two or more.Vapor phase exit a is open towards different on liquid-phase outlet b top；Vapor with
Unboiled water guides to different directions, forms steam stream and fluid course.
It should be noted that in the case where there is sufficient space to efficiently separate phase, this bottom segregation section can omit,
Water vapour and backwater are directly exported by evaporation tube.
The filming device that feedwater distribution cloth film section in top is set mainly has several forms：Plate hole formula filming device, pitting cloth film
Device, plate ring type filming device and spiral filming device.
As shown in Figure 15 to 18, plate hole formula filming device be on the shrouding of top along heat pipe tangential direction downwards distribution 2~
20 inlet openings, inlet opening are circular, square or rectangle or other shapes, and sectional area is suitable with 0.5~5mm of Φ circular hole,
The quantity and specification of water inlet are according to the evaporation task setting of the heat pipe.Plate hole formula filming device film-type evaporation in the present embodiment
Pipe, evaporation tube 76 × 4mm of specification, inlet opening bore 1mm, water inlet hole number n=7, evaporation tube overall length l=15m.
As shown in Figure 19 to 22, pitting filming device is below the shrouding of top, along heat pipe tangent line side on heat pipe
To 2~20 inlet openings of downward distribution；Inlet opening can be circular, square or rectangle or other shapes, sectional area and Φ 0.5
~5mm circular hole is suitable, and the quantity and specification of inlet opening are according to the evaporation task setting of the heat pipe.Pitting filming device membrane type
Evaporation tube, evaporation tube 51 × 3mm of specification, inlet opening bore 0.5mm, water inlet hole number n=3, evaporation tube overall length l=3m.
As shown in Figure 23 to 26, plate ring type filming device is to set a ring formula to heated tube wall direction on the shrouding of top
Water inlet, lower end discharge ring gap is set in 0.02~0.5mm according to the evaporation load of the heat pipe.In the present embodiment, plate ring
Formula filming device film-type evaporation pipe, evaporation tube 89 × 5mm of specification, the wide 0.04mm of circumferential weld, circumferential weld diameter 70, evaporation tube overall length l=
16m。
As shown in Figure 27 to 30, spiral filming device is to set one according to the heat pipe evaporation load on the shrouding of top
0.5~10mm of Φ circular hole inlet opening, the spiral spray thrower of corresponding specification is set in the circular hole lower end, top is intake with umbrella
Shape covering of the fan is ejected into heat pipe internal face.In the present embodiment, spiral filming device film-type evaporation pipe, evaporation tube specification 51 ×
3mm, inlet opening bore 2mm, evaporation tube overall length l=2.8m, evaporation tube head and the tail set pipe screw thread.
The increase of the lower end of filming device 1 sets equal film ring（Equal membrane device）, it would be possible to because of the drop guiding being splashed at a high speed outside wall
To wall so that feedwater is flowed down with ring-shaped liquid film along wall.
In membrane type steam-generating tube, as shown in Figure 10, feed water and biography is evaporated with the state of very thin moisture film, flowing
Heat, heat transfer coefficient is performed into maximum, reaches 30000~40000W/m2·℃.Evaporate liquid phase gasifying surface area in tubulation
Maximum is performed to, is 50~500 times of lateral cross-sectional area.In contrast to the vapour of water in drum formula and the heated tubulation of once-through boiler
Change form, same area are heated tubulation, in the case of same phase temperature difference, vaporization capacity be approximately their 250~
2500 times；Feedwater, without the vaporization of fluidized state, is given with liquid film state direct boiling vapour phase into pipe in membrane type steam-generating tube
The temperature difference that water will not occur as shown in Figure 7 with tube wall rises first kind heat transfer deterioration shown in rate of heat transfer decline and accompanying drawing 8 and showed
As.Also, the heat transfer coefficient of film-type evaporation is not influenceed by vapour phase pressure change, the evaporating temperature of liquid in pipe with it only than connecing
Tactile saturated-steam temperature is high 0.5~2 DEG C；In film-type evaporation pipe, industrial soft water constantly supplies from top spray, liquid film flow
Much larger than in-tube evaporation amount, so, liquid film breakage, cutout phenomenon are not had in film-type evaporation pipe；Heated inside pipe wall is protected by liquid film
Protect, maintain high and stable rate of heat transfer vaporization all the time, heat transfer deterioration phenomenon will not occur.
In addition to the implementation, the utility model also includes other embodiment, all to use equivalents or equivalent
The technical scheme that substitute mode is formed, all should fall within the protection domain of the utility model claims.
Claims (5)
- A kind of 1. membrane type steam-generating tube, it is characterised in that：Fed water by top and distribute cloth film section, middle part film-type evaporation section and bottom Vapor-liquid separation section forms,The top feedwater distribution cloth film section includes filming device, controls feedwater feedstock direction and inlet amount to make directly by the filming device Connect along wall film forming, or the uniform cloth film of the equal membrane device reallocation of combination, liquid film is contacted under initial flow rate and Action of Gravity Field along wall Heating surface is flowed down with uniform moisture film shape；The middle part film-type evaporation section, heat pipe provide heat energy to radiate in pipe external heat source with convection current conduction pattern, and liquid film is continuous Alternately flow so that liquid film entirety thermally equivalent, feedwater absorb heat energy after it is direct by liquid phase carburation by evaporation, the vapour phase steam of vaporization It is diffused into heat pipe central space；The bottom vapor-liquid separation section is made up of vapor phase exit and liquid-phase outlet, and vapor phase exit is opened on the top of liquid-phase outlet Mouth direction is different；Vapor guides with unboiled water to different directions, forms steam stream and fluid course.
- 2. membrane type steam-generating tube according to claim 1, it is characterised in that：The filming device mainly has several forms： Plate hole formula filming device, pitting filming device, plate ring type filming device and spiral filming device；Plate hole formula filming device is in top shrouding On along heat pipe tangential direction, 2~20 inlet openings of distribution, inlet opening be circular, square or rectangle downwards, its sectional area and 0.5~5mm of Φ circular hole is suitable, and the quantity and specification of water inlet are according to the evaporation task setting of the heat pipe；Pitting filming device is below the shrouding of top, and along heat pipe tangential direction, distribution 2~20 is entered downwards on heat pipe Water hole；Inlet opening can be circular, square or rectangle, and its sectional area is suitable with 0.5~5mm circular hole, the quantity of inlet opening Evaporation task setting with specification according to the heat pipe；Plate ring type filming device is to set a ring formula water inlet to heated tube wall direction on the shrouding of top, according to the heat pipe Evaporation load set lower end discharge ring gap in 0.02~0.5mm；Spiral filming device is that the circular hole for setting a 0.5~10mm according to the heat pipe evaporation load on the shrouding of top enters Water hole, the spiral spray thrower of corresponding specification is set in the circular hole lower end, top is intake heat pipe is ejected into umbrella covering of the fan Internal face.
- 3. membrane type steam-generating tube according to claim 1, it is characterised in that：The filming device lower end increase sets equal film Ring.
- 4. membrane type steam-generating tube according to claim 1, it is characterised in that：Specification is that DN20~DN200 boiler is special With steel pipe, draw ratio l/d is between 50~200；Length ratio shared by top feedwater distribution cloth film section and bottom vapor-liquid separation section For the 1~2% of entire length.
- 5. membrane type steam-generating tube according to claim 1, it is characterised in that：System in combination can be that welding or screw thread connect Binding structure.
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| CN201720235822.7U CN206656337U (en) | 2017-03-10 | 2017-03-10 | A kind of membrane type steam-generating tube |
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| CN201720235822.7U CN206656337U (en) | 2017-03-10 | 2017-03-10 | A kind of membrane type steam-generating tube |
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Effective date of registration: 20201218 Address after: 235000 Huaibei new coal chemical synthetic material base in Anhui Province west of Linbai Road north of Railway Patentee after: Anhui Ruibai New Material Co.,Ltd. Patentee after: Jiangsu Kelin an Naiji Technology Co.,Ltd. Address before: 214422 Room 205, 65 Building, Yunxin Village, Yunting Street, Jiangyin City, Wuxi City, Jiangsu Province Patentee before: Gao Feng |