CN101865612B - Simulated bicontinuous tree-shaped pipe bundle type steam condenser - Google Patents
Simulated bicontinuous tree-shaped pipe bundle type steam condenser Download PDFInfo
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Abstract
The invention provides a simulated bicontinuous tree-shaped pipe bundle type steam condenser, which belongs to the technical field of heat exchangers. The simulated bicontinuous tree-shaped pipe bundle type steam condenser consists of a plurality of heat exchange pipes, a front end pipe plate, a middle pipe plate, a back end pipe plate, a case assembly, a steam baffle plate, a front water chamber, a back water chamber and the like. The invention is characterized in that the distribution of the heat exchange pipes of the steam condenser pipe bundle on the pipe plate is in simulated bicontinuous tree-shaped distribution, and the heat exchange pipes are formed by simulated bicontinuous tree loose tree branch pipe bundle region pipe bundles, simulated bicontinuous tree dense pipe bundle region pipe bundles, gradually reducing air cooling region pipe bundles and the like, wherein a simulated bicontinuous tree loose tree branch pipe bundle region consists of simulated tree branch-shaped pipe bundles with the upwards inclined upper part, simulated tree branch-shaped pipe bundles with the horizontal lower part, simulated tree branch-shaped pipe bundles with the downwards bottom and the like, the simulated bicontinuous tree-shaped span ratio is 0.3 to 0.4, the height to width ratio of the simulated bicontinuous tree-shaped pipe bundles is 1.1 to 2.0, the gap average permeability is 0.3 to 0.6, the peripheral average voidage is 0.2 to 0.4, the simulated tree branch relative width is 4 to 12, and the simulated tree branch relative gap is 2.5 to 5. The invention has the advantages of uniform and eddy-free pipe bundle steam flow flowing field, small steam resistance of the case side, uniform heat load distribution, small condensing water supercooling degree, high heat transfer coefficient and high operation vacuum degree. The heat exchange coefficient can be 10 to 20 percent higher than the HEI calculation value, and the machine set energy-saving effect is obvious.
Description
Technical field
The present invention relates to a kind of simulated bicontinuous tree-shaped pipe bundle type steam condenser, particularly the layout of the cooling tube in the condenser of the large-scale unit in power station tube bank is a kind of simulated bicontinuous tree-shaped pipe bundle type steam condenser of bionical bicontinuous tree-shaped structure.
Background technology
Plant condenser is a kind of shell-and-tube heat exchanger, is the important composition parts of thermal power generation, nuclear power generating sets, and its effect is that the exhaust steam that steam turbine is discharged is condensed into water and sets up and keep certain vacuum values at the steam drain of steam turbine.Whether what the tube bank of condenser cooling tube was arranged rationally has material impact to vapor condensation process, and the energy consumption of its heat exchange property and unit is had bigger influence.Tube bank arranges and unreasonablely will cause the unreasonable of steam flow field, bring thus that heat load distribution is inhomogeneous, local air gathers, flow resistance is excessive, degree of supercooling greatly, the not mutual fusion of the steam flow of homocoagulation degree even leak vapour (steam without condensation directly enters air cooling zone) etc.Thereby design tube bank and arrange that obtaining rational vapor stream field distribution is the important content that condenser designs, and reasonably restrains and arranges it is the basis that the condenser performance guarantees.Condenser adopts the HEI standard to calculate at present, but do not consider the influence of structure in the HEI standard, the bank of condenser pipes layout design may make the actual design performance that can't reach by the HEI standard design of unit performance, and is particularly more outstanding for transforming the limited more situation of unit.In fact, the general off-design vacuum of the actual motion vacuum 1-3kPa of generation current unit, energy consumption is obviously higher, and its one of the main reasons is exactly that bank of condenser pipes is arranged unreasonable causing.Studies show that the actual condenser vacuum that irrational bank of condenser pipes is arranged may differ more than the 1kPa with the vacuum of calculating by the HEI standard, directly the appreciable impact unit exerts oneself and economy.The condenser that adopts reasonably tube bank to arrange, its unit energy-saving benefit is obvious.
The pattern that present bank of condenser pipes is arranged, church window formula tube bank layout pattern is the most typically arranged (as US5465784A, JP2000018845A, US2001025703A1, ZL200820222618.2 etc.), chevron tube bank layout pattern (perhaps is called TEPEE cloth Manifold technology, as DE4141132-C2, ZL01206563.3 etc.), radial inflow tube bank layout pattern (as ZL200520043375.7 etc.), AT type tube bank layout pattern, vertical balanced flow dynamic formula tube bank layout pattern, general's hat type tube bank layout pattern, radiation spike tube bank layout pattern (as ZL96102519.0 etc.), Double Diamond formula tube bank layout pattern etc.Show through numerical simulation, these tube bank layout patterns all come with some shortcomings in various degree, undesirable even have an eddy current dead band as some condensing effect, some shell-side flow resistance is excessive and degree of supercooling is big, some exists the not mutual fusion of steam flow even the leakage vapour of homocoagulation degree, and some tube bank arranges that compactness obviously increases investment or transforms unit and can't adopt owing to shell structure is size-constrained inadequately.For example, patent documentation DE4141132-C2 (Germany) and ZL01206563.3 (China) disclose a kind of very similarly two chevron tube bank and have arranged, numerical simulation analysis shows, the vapour locking inequality that this tube bank is arranged, exist and transregionally flow, exist at the drip tray place and significantly leak vapour, it is lower more than 10% than press the HEI standard design that it calculates heat transfer coefficient, if leak vapour more seriously then its calculating heat transfer coefficient hangs down more than 20% than pressing the HEI standard design.Numerical analysis shows, irrational bank of condenser pipes arranges, its coefficient of heat transfer is than carrying out the low 10-20% of calculated value by the HEI standard, some (as Double Diamond formula tube bank layout pattern etc.) even reach more than 30%, the exerting oneself and economy of appreciable impact unit.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind ofly restrain that the steam flow even flow field does not have eddy current, the shell-side vapour locking is little, heat load distribution is even, condensate undercooling is little, the heat transfer coefficient of condenser and all higher simulated bicontinuous tree-shaped arrangement form of operation vacuum, to overcome above-mentioned the deficiencies in the prior art.
For achieving the above object, the present invention takes following technical scheme:
A kind of simulated bicontinuous tree-shaped pipe bundle type steam condenser, comprise several heat exchanger tubes, the front end tube sheet, sagging plate, the rear end tube sheet, housing unit, the air cooling steam baffle, front water chamber and back hydroecium, it is characterized in that: be a kind of heat exchanger tube that is arranged on the condenser sagging plate is simulated bicontinuous tree-shaped layout on described sagging plate simulated bicontinuous tree-shaped pipe bundle type steam condenser, this condenser exists on described sagging plate face apart from 4 times of heat-exchanging tube bundle outer contours to the imaginary cut-off rule of tube center distance, with described imaginary cut-off rule and air cooling steam baffle is the boundary, described sagging plate face is divided into the loose branch tube bank of simulated bicontinuous tree district, the intensive branch tube bank of simulated bicontinuous tree district, convergent air cooling tube bank district and the simulated bicontinuous tree trunk shape center district of drawing gas, wherein:
The loose branch tube bank of simulated bicontinuous tree district, be positioned at the outside of described imaginary cut-off rule, be divided into the loose branch tube bank of the simulated bicontinuous tree in top district, the simulated bicontinuous tree in bottom loose branch tube bank district and the loose branch tube bank of the simulated bicontinuous tree in bottom district three parts, wherein, there is the convergent shape space between bionical dendriform tube bank that is tilted to and the bionical branch that is tilted in the loose branch tube bank of the simulated bicontinuous tree in top district, there is the convergent shape space between the bionical branch of the bionical dendriform tube bank of level and level in the loose branch tube bank of the simulated bicontinuous tree in bottom district, there is the convergent shape space between downward bionical dendriform tube bank and downward bionical branch in the loose branch tube bank of the simulated bicontinuous tree in bottom district
The intensive branch tube bank of simulated bicontinuous tree district, be positioned at the inboard of described imaginary cut-off rule, and the air cooling steam baffle outside is close in the intensive branch tube bank of the simulated bicontinuous tree of part district, the district of drawing gas, the simulated bicontinuous tree trunk shape center that the inside in the intensive branch of simulated bicontinuous tree tube bank district and convergent air cooling tube bank district one of the envelope in bottom are interconnected
Convergent air cooling tube bank district, be positioned at the middle and lower part of the simulated bicontinuous tree of described simulated bicontinuous tree-shaped pipe bundle, about convergent air cooling tube bank district an air cooling steam baffle is arranged respectively, described two air cooling steam baffles make air cooling tube bank district constitute the zone of a convergent, an evacuation tube is arranged at the top in convergent air cooling tube bank district, draw gas to distinguish with simulated bicontinuous tree trunk shape center and be connected in the bottom in convergent air cooling tube bank district
The district of drawing gas, simulated bicontinuous tree trunk shape center is positioned at the inside in the intensive branch tube bank of described simulated bicontinuous tree district, is communicated with the bottom that simulated bicontinuous tree intensive branch tube bank district and the tube bank of convergent air cooling are distinguished respectively,
In described simulated bicontinuous tree-shaped pipe bundle type steam condenser, the steam that steam turbine is discharged enters simulated bicontinuous tree-shaped pipe bundle between the outermost heat exchange tube of simulated bicontinuous tree-shaped pipe bundle, steam is cooled in the loose branch tube bank of the simulated bicontinuous tree in the simulated bicontinuous tree-shaped pipe bundle district of outermost tube bank district and condensation makes steam flow rate descend rapidly, continue to be cooled and condensation in the intensive branch tube bank of simulated bicontinuous tree district then, draw gas through simulated bicontinuous tree trunk shape center again to distinguish and collect, flow to convergent air cooling tube bank district then further is cooled from the bottom that the tube bank of convergent air cooling is distinguished, last remaining a small amount of vapour gas mixture is extracted out by vavuum pump through the evacuation tube on top, convergent air cooling tube bank district, makes condenser keep certain vacuum.
It is characterized in that: described simulated bicontinuous tree-shaped pipe bundle is up and down to a minute cooling water two-tube-pass, or cooling water single tube journey.
It is characterized in that: the simulated bicontinuous tree-shaped span accounting of described simulated bicontinuous tree-shaped pipe bundle is 0.3-0.4, described simulated bicontinuous tree-shaped span accounting is B2/ (B1+B2+B3), wherein: B1 is the medium line of a bionical tree-like trunk and the distance of nearest inner walls, B2 is the distance of the medium line of 2 bionical tree-like trunks in the simulated bicontinuous tree-shaped pipe bundle, be simulated bicontinuous tree-shaped span, B3 is the medium line of another bionical tree-like trunk of simulated bicontinuous tree-shaped pipe bundle and the distance between the condenser shell assembly cross-section center line.
It is characterized in that: described simulated bicontinuous tree-shaped pipe bundle depth-width ratio is H/B=1.1-2.0, and wherein: H is the height of simulated bicontinuous tree-shaped pipe bundle, and B is the width of simulated bicontinuous tree-shaped pipe bundle.
It is characterized in that: the zone of reasonableness of the space mean permeability E/F of described simulated bicontinuous tree-shaped pipe bundle is 0.3-0.6, the zone of reasonableness of restraining peripheral average void fraction D/ (C+D) is 0.2-0.4, the zone of reasonableness of bionical branch relative width C/A is 4-12, the zone of reasonableness of relative space D/A is 2.5-5 between bionical branch, wherein: C is the bionical branch width in the loose branch tube bank of simulated bicontinuous tree district, D is the interbank convergent shape space of bionical dendriform, E is a convergent shape space length of penetration, F is the tube bank depth of placement, and A is a tube center distance.
It is characterized in that: described simulated bicontinuous tree-shaped pipe bundle is provided with a plurality of zigzag branch journey steam baffles at the middle part to the simulated bicontinuous tree-shaped pipe bundle that divides up and down for up and down to minute cooling water two-tube-pass the time.
The present invention is owing to take above technical scheme, it has the following advantages: tube bank steam flow even flow field does not have eddy current, the shell-side vapour locking is little, heat load distribution is even, condensate undercooling is little, the heat transfer coefficient of condenser and operation vacuum are all higher, the coefficient of heat transfer can improve the coefficient of heat transfer more than 20% than common banded chevron stringing scheme, than pressing the high 10%-20% of HEI calculated value, its shell-side vapour locking is the 30%-50% of common tube bank (under steam-tight situation), and its unit energy-saving effect is obvious.
Description of drawings
Fig. 1 is embodiments of the invention one condenser structural representations
Fig. 2 is the condenser left side TV structure schematic diagram of embodiments of the invention one
Fig. 3 is the middle cross-sectional view of the condenser of embodiments of the invention one
Fig. 4 is the simulated bicontinuous tree-shaped pipe bundle sagging plate schematic diagram of embodiments of the invention one
Fig. 5 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (top) of embodiments of the invention one
Fig. 6 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (bottom) of embodiments of the invention one
Fig. 7 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (part, top) of embodiments of the invention one
Fig. 8 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (bottom local I) of embodiments of the invention one
Fig. 9 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (bottom local I I) of embodiments of the invention one
Figure 10 is the simulated bicontinuous tree-shaped layout partial enlarged drawing (line figure) of embodiments of the invention two
Figure 11 is the simulated bicontinuous tree-shaped pipe bundle numerical simulation flow field figure (streamline) of embodiments of the invention one
Figure 12 is the simulated bicontinuous tree-shaped pipe bundle numerical simulation flow field figure (line of equal velocity) of embodiments of the invention one
Figure 13 is the simulated bicontinuous tree-shaped layout schematic diagram of embodiments of the invention two
Figure 14 is embodiments of the invention two simulated bicontinuous tree-shaped pipe bundle sagging plate schematic diagrames
Figure 15 is the simulated bicontinuous tree-shaped layout schematic diagram of embodiments of the invention three
Figure 16 is embodiments of the invention three simulated bicontinuous tree-shaped pipe bundle sagging plate schematic diagrames
Figure 17 is the simulated bicontinuous tree-shaped layout schematic diagram of embodiments of the invention four
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
Embodiment one
Fig. 1 is embodiments of the invention one condenser structural representations.In Fig. 1,1 is condenser front water chamber (having 2), 2 are condenser front end tube sheet (having 2), 3 are several heat exchanger tubes (present embodiment has 22992 heat exchanger tubes, among Fig. 1 only signal 2 heat exchanger tubes that draw), and 4 be sagging plate (having 2x13 spare), 5 is the condenser shell assembly, 6 are hydroecium (having 2) behind the condenser, and 7 are condenser rear end tube sheet (having 2), 8 attaching parts (connecing neck) for condenser and steam turbine.The pore that heat exchanger tube passes sagging plate is connected with the two ends tube sheet, and heat exchanger tube can be to rise to connect or weld or rise to connect to add welding with being connected of two ends tube sheet.
Fig. 2 is the condenser left side TV structure schematic diagram of embodiments of the invention one.In Fig. 2,1 (has 2 for the condenser front water chamber, be illustrated as left front hydroecium, the split layout of laying down with the heat exchanger tube that shows its condenser inside of right front hydroecium), 2 are condenser front end tube sheet (having 2), 3 are several heat exchanger tubes (present embodiment has 22992 heat exchanger tubes), 5 is the condenser shell assembly, 9 are the outer contour of simulated bicontinuous tree-shaped layout for the condenser heat exchanger tube, be condenser and be the line of peripheral heat exchanger tube center on the tube sheet face of one group/a branch of heat exchanger tube of simulated bicontinuous tree-shaped layout, this group/bundle is simulated bicontinuous tree-shaped layout on the tube sheet face heat exchanger tube is called simulated bicontinuous tree-shaped pipe bundle.Present embodiment has 22992 heat exchanger tubes, divides symmetrical two groups, and the layout of every group of heat exchanger tube on tube sheet is simulated bicontinuous tree-shaped layout, and promptly the outer contour of the layout of every group of heat exchanger tube on tube sheet is alike with the profile of two trees that interconnect.In Fig. 2,1 simulated bicontinuous tree-shaped pipe bundle on the right that only drawn, each simulated bicontinuous tree-shaped pipe bundle has 11496 heat exchanger tubes.Present embodiment is symmetrical two cooling circuits in parallel, has hydroecium behind 2 front water chambers and 2, each cooling circuit is again respectively for up and down to a minute cooling water two-tube-pass structure, the moisture two-way that promptly circulates enters the lower inlet hydroecium of condenser front water chamber, the Steam Heating of being discharged by steam turbine in the heat exchanger tube of tube bank bottom respectively then, circulating water flow through after hydroecium heat once more at the steam of being discharged by steam turbine again after mixing from the heat exchanger tube on tube bank top, the top outlet hydroecium that arrives front water chamber is then flowed out by circulating water outlet, steam is cooled to the overwhelming majority and is condensed outside the bank of condenser pipes heat exchanger tube, remaining vapour gas mixture (be steam and AIR MIXTURES, have only usually condenser inlet steam amount about 0.03%) extract out by vavuum pump and keep certain vacuum of condenser through evacuation tube.
Fig. 3 is the middle cross-sectional view of the condenser of embodiments of the invention one.In Fig. 3,3 is several heat exchanger tubes (the heat exchanger tube tube bank of present embodiment is made up of 22992 heat exchanger tubes), 4 is condenser sagging plate (total 2x13 spare), and 5 is the condenser shell assembly, and 9 are the outer contour of simulated bicontinuous tree-shaped layout for the heat exchanger tube of condenser.In Fig. 3, there are 22992 heat exchanger tubes to be 2 simulated bicontinuous tree-shaped layouts, each simulated bicontinuous tree-shaped pipe bundle has 11496 heat exchanger tubes.
Present embodiment is the two-tube-pass structure to dividing up and down.In Fig. 3, a simulated bicontinuous tree-shaped pipe bundle on the left side is divided into M1-1 district, M1-2 district, M1-3 district, M2-1 district, M2-2 district, A district and D district, wherein M1-1 district, M1-2 district, M1-3 district and A district are the 1st flow process cooling tube bundle district (cooling water is heated for the 1st time in the heat exchanger tube of tube bank), M2-1 district and M2-2 district are the 2nd flow process cooling tube bundle district (cooling water is heated for the 2nd time in the heat exchanger tube of tube bank), M1-1 district, M1-2 district, M1-3 district, M2-1 district and M2-2 district are tube bank main cooling zone (M district), the A district is the district of drawing gas, center for tube bank air cooling zone, D district.Steam is cooled in the main cooling zone of tube bank (M district) afterwards to the overwhelming majority and is condensed, remaining vapour gas mixture is compiled by the district (D district) of drawing gas, center, continue cooling and condensation at tube bank air cooling zone (A district) again, kept certain vacuum of condenser then by the vavuum pump extraction through evacuation tube, finally the vapour gas mixture of being extracted out by vavuum pump has only about 0.03% of condenser inlet steam amount usually.
In Fig. 3, B1 is the medium line of a bionical tree-like trunk and the distance of nearest inner walls, B2 is the distance (simulated bicontinuous tree-shaped span) of the medium line of 2 bionical tree-like trunks in the simulated bicontinuous tree-shaped pipe bundle, B3 is the medium line of another bionical tree-like trunk of simulated bicontinuous tree-shaped pipe bundle and the distance between the condenser shell assembly cross-section center line, B is that the maximum horizontal size of simulated bicontinuous tree-shaped pipe bundle outer contour is the width of simulated bicontinuous tree-shaped pipe bundle, and H is that the maximum vertical size of simulated bicontinuous tree-shaped pipe bundle outer contour is the height of simulated bicontinuous tree-shaped pipe bundle.In the present embodiment, simulated bicontinuous tree span B2 with the ratio of the corresponding steam channel overall width of this simulated bicontinuous tree-shaped pipe bundle (B1+B2+B3) (be called for short: simulated bicontinuous tree-shaped span accounting) B2/ (B1+B2+B3)=0.377, numerical simulation analysis show that the zone of reasonableness of simulated bicontinuous tree-shaped span accounting is B2/ (B1+B2+B3)=0.3-0.4; (be called for short: the simulated bicontinuous tree-shaped pipe bundle depth-width ratio) H/B=1.31, numerical simulation analysis show that the zone of reasonableness of simulated bicontinuous tree-shaped pipe bundle depth-width ratio is H/B=1.1-2.0 to the ratio of the height H of simulated bicontinuous tree-shaped pipe bundle and the width B of simulated bicontinuous tree-shaped pipe bundle.Excessive or too small simulated bicontinuous tree-shaped span accounting and simulated bicontinuous tree-shaped pipe bundle depth-width ratio may cause the unreasonable of shell side steam flow field, thereby cause the problem such as reduction, the increase of shell side vapour locking of heat exchange.In the present embodiment, in same condenser shell assembly, be provided with two simulated bicontinuous tree-shaped pipe bundles side by side, three simulated bicontinuous tree-shaped pipe bundles side by side also can be set.If be provided with the simulated bicontinuous tree-shaped pipe bundle side by side more than four or four in same condenser shell assembly, then the condenser shell assembly may be wide and have structure, a problem such as uneconomical as also guaranteeing above-mentioned Reasonable Parameters.
Fig. 4 is the simulated bicontinuous tree-shaped pipe bundle sagging plate schematic diagram of embodiments of the invention one.Fig. 5 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (top) of embodiments of the invention one.Fig. 6 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (bottom) of embodiments of the invention one.In Fig. 4, Fig. 5 and Fig. 6,4 is the condenser sagging plate, 9 is the simulated bicontinuous tree-shaped layout outer contour of condenser, 10 is imaginary cut-off rule, and the line of the imaginary cut-off rule peripheral heat exchanger tube of the simulated bicontinuous tree-shaped heat-exchanging tube bundle of 10 distances on tube sheet is that the distance of the simulated bicontinuous tree-shaped layout outer contour 9 of condenser is 4 times a heat exchanger tube centre-to-centre spacing.This imagination cut-off rule 10 is divided into simulated bicontinuous tree loose branch tube bank district 22 and the intensive tube bank of simulated bicontinuous tree district 23 with simulated bicontinuous tree-shaped pipe bundle, the loose branch tube bank of the simulated bicontinuous tree in simulated bicontinuous tree-shaped pipe bundle district district 22 is positioned at the outside of imaginary cut-off rule, the intensive tube bank of the simulated bicontinuous tree district 23 in simulated bicontinuous tree-shaped pipe bundle district is positioned at the inboard of imaginary cut-off rule, 11 is the bionical dendriform tube bank that is tilted to, 12 is the interbank convergent shape space of bionical dendriform that is tilted to, 13 are the district of drawing gas, center, can see the trunk of the simulated bicontinuous tree of simulated bicontinuous tree-shaped pipe bundle as, 14 divide the journey steam baffle for zigzag, 15 are the air cooling zone tube bank, 16 is the air cooling zone steam baffle, 17 is evacuation tube, 18 is the bionical dendriform tube bank of level, 19 is the interbank convergent shape space of bionical dendriform of level, 20 is downward bionical dendriform tube bank, and 21 is the downward interbank convergent shape space of bionical dendriform.The effect of zigzag branch journey steam baffle 14 is that bionical dendriform is restrained being divided into two parts up and down, stops that simultaneously steam flow directly passes through in the space in the middle of two parts are restrained up and down.The effect of air cooling zone steam baffle 16 is the vapour gas mixture cooling zones that air cooling zone surrounded a convergent, make (the M district among Fig. 3) condensed vapour gas mixture through main cooling tube bundle district, enter air cooling zone via 13 bottoms from air cooling zone, district of drawing gas, center, vapour gas mixture evacuation tube 17 of flowing through after air cooling zone is continued condensation and cooling is extracted out by vavuum pump.
In Fig. 4, Fig. 5 and Fig. 6, there is the convergent shape space 12 between bionical dendriform tube bank 11 that is tilted to and the bionical branch that is tilted on the top in simulated bicontinuous tree-shaped pipe bundle district, being the convergent shape space 19 between the bionical branch of the bionical dendriform tube bank 18 of level and level in the bottom in simulated bicontinuous tree-shaped pipe bundle district, is the convergent shape space 21 between downward bionical dendriform tube bank 20 and downward bionical branch in the bottom in simulated bicontinuous tree-shaped pipe bundle district.The bionical dendriform tube bank that the bionical dendriform tube bank that the loose branch tube bank of the simulated bicontinuous tree in simulated bicontinuous tree-shaped pipe bundle district district is made progress by tube bank district upper angled, the bionical dendriform tube bank of tube bank district lower horizontal and bottom, tube bank district are downward etc. is formed.Simulated bicontinuous tree-shaped pipe bundle is made up of the loose branch tube bank of simulated bicontinuous tree district's tube bank, the tube bank of the intensive tube bank of simulated bicontinuous tree district, air cooling zone tube bank etc.
Fig. 7 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (part, top) of embodiments of the invention one.Fig. 8 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (bottom local I) of embodiments of the invention one.Fig. 9 is the simulated bicontinuous tree-shaped pipe bundle partial enlarged drawing (bottom local I I) of embodiments of the invention one.Figure 10 is the simulated bicontinuous tree-shaped layout partial enlarged drawing (line figure) of embodiments of the invention two.In Fig. 7, C1 is the bionical branch width that is tilted to, and D1 is the interbank convergent shape space of bionical dendriform that is tilted to, and E1 is convergent shape space, a top length of penetration, and F1 is the upper bundle depth of placement.In Fig. 7, space mean permeability E1/F1 ≈ 0.4 restrains peripheral average void fraction D1/ (C1+D1) ≈ 0.33, bionical branch relative width C1/A ≈ 5.2, and relative space D1/A ≈ 2.6 between bionical branch, wherein A is a tube center distance.The analysis showed that, the zone of reasonableness of space mean permeability E1/F1 is 0.3-0.6, the zone of reasonableness of restraining peripheral average void fraction D1/ (C1+D1) is 0.2-0.4, and bionical branch relative width C1/A zone of reasonableness is 4-12, and the zone of reasonableness of relative space D1/A is 2.5-5 between bionical branch.In Fig. 8, C2 is the bionical branch width of level, and D2 is the interbank convergent shape space of the bionical dendriform of level, and E2 is convergent shape space, a bottom length of penetration, and F2 is the lower tube bundle depth of placement.In Fig. 8, space mean permeability E2/F2 ≈ 0.52 restrains peripheral average void fraction D2/ (C2+D2) ≈ 0.33, bionical branch relative width C2/A ≈ 5.2, relative space D2/A ≈ 2.6 between bionical branch.The analysis showed that, the zone of reasonableness of space mean permeability E2/F2 is 0.3-0.6, the zone of reasonableness of restraining peripheral average void fraction D3/ (C3+D3) is 0.2-0.4, and the zone of reasonableness of bionical branch relative width C2/A is 4-12, and relative space D2/A zone of reasonableness is 2.5-5 between bionical branch.In Fig. 9, C3 is downward bionical branch width, and D3 is the downward interbank convergent shape space of bionical dendriform, and E3 is convergent shape space, a bottom length of penetration, and F3 is a bottom tube bank depth of placement.In Fig. 8, space mean permeability E3/F3 ≈ 0.39 restrains peripheral average void fraction D3/ (C3+D3) ≈ 0.28, bionical branch relative width C3/A ≈ 10.5, relative space D3/A ≈ 4 between bionical branch.The analysis showed that, the zone of reasonableness of space mean permeability E3/F3 is 0.3-0.6, the zone of reasonableness of restraining peripheral average void fraction D3/ (C3+D3) is 0.2-0.4, and the zone of reasonableness of bionical branch relative width C3/A is 4-12, and relative space D3/A zone of reasonableness is 2.5-5 between bionical branch.
In sum, the zone of reasonableness of space mean permeability E/F is 0.3-0.6, the zone of reasonableness of restraining peripheral average void fraction D/ (C+D) is 0.2-0.4, the zone of reasonableness of bionical branch relative width C/A is 4-12, and the zone of reasonableness of relative space D/A is 2.5-5 between bionical branch, and wherein: C is the bionical branch width in the loose branch tube bank of simulated bicontinuous tree district, D is the interbank convergent shape space of bionical dendriform, E is a convergent shape space length of penetration, and F is the tube bank depth of placement, and A is a tube center distance.
Figure 11 is the simulated bicontinuous tree-shaped pipe bundle numerical simulation flow field figure (streamline) of embodiments of the invention one.Figure 12 is the simulated bicontinuous tree-shaped pipe bundle numerical simulation flow field figure (line of equal velocity) of embodiments of the invention one.From Figure 11 and Figure 12 as can be seen, when turbine discharge after connecing neck and entering condenser, steam enters simulated bicontinuous tree-shaped pipe bundle between the outermost heat exchange tube of simulated bicontinuous tree-shaped pipe bundle, steam is to be cooled in the loose branch tube bank of the simulated bicontinuous tree area in simulated bicontinuous tree-shaped pipe bundle district and condensation makes steam flow rate descend rapidly in 4 row's heat exchanger tube zones of outermost tube bank, continue to be cooled and condensation in the intensive tube bank of the simulated bicontinuous tree district in simulated bicontinuous tree-shaped pipe bundle district then, the district of drawing gas through the center again is that the trunk shape of simulated bicontinuous tree of the simulated bicontinuous tree-shaped pipe bundle district of drawing gas compiles, flowing to air cooling zone then further is cooled, last vapour gas mixture (thing have only usually condenser inlet steam amount about 0.03%) is extracted out by vavuum pump through evacuation tube, makes condenser keep certain vacuum.Because the outline length in simulated bicontinuous tree-shaped pipe bundle district is 3-6 times of common tube bank, the vapour locking that steam enters simulated bicontinuous tree-shaped pipe bundle is the common 30%-50% that does not leak the steam pipe bundle, and the shell-side vapour locking of simulated bicontinuous tree-shaped pipe bundle is significantly less than the shell-side vapour locking of common tube bank.
From Figure 11 and Figure 12, it can also be seen that, simulated bicontinuous tree-shaped pipe bundle steam flow even flow field does not have eddy current, nothing is leaked vapour, no transregional flowing, there is not the air accumulation district yet, thereby heat load distribution is even, total obvious height of the coefficient of heat transfer and common tube bank, can improve 20-30% even higher than the coefficient of heat transfer of common tube bank, than exceeding 10-20% by the HEI calculated value; Simultaneously, simulated bicontinuous tree-shaped layout with respect to radiation spike tube bank arrange, the tube bank of Double Diamond formula is arranged, the tube bank of general's hat type is arranged and window formula tube bank in church is arranged etc. more compact, make between two simulated bicontinuous tree-shaped pipe bundles and the flow direction that the steam between simulated bicontinuous tree-shaped pipe bundle and the condenser shell assembly is unimpeded tube bank bottom and hot well, thereby condensate undercooling is little even approach zero.Total coefficient of heat transfer of the numerical simulation calculation of present embodiment can improve the coefficient of heat transfer more than 20% than common banded chevron stringing (TEPEE stringing) scheme, improve the coefficient of heat transfer more than 30% than Double Diamond formula tube bank layout, general's hat type tube bank arrangement, not only satisfy the HEI requirement, and its coefficient of heat transfer and HEI calculated value exceed 10%-20%, and its energy-saving effect is obvious.
The condenser simulated bicontinuous tree-shaped pipe bundle is suitable for the tube bank of large condenser and arranges.The simulated bicontinuous tree-shaped layout of condenser is based on a kind of high-performance large-scale bank of condenser pipes placement technique that the accurate true tube bank porous media numerical simulation technology of the long-pending dissipation theory of transmittance process, bionical optimization numerical simulation technology and condenser is researched and developed in the new ideas calorifics.
In sum, a kind of simulated bicontinuous tree-shaped pipe bundle type steam condenser of the present invention, be by several heat exchanger tubes, the front end tube sheet, sagging plate, the rear end tube sheet, housing unit, steam baffle, front water chamber, compositions such as back hydroecium, it is characterized in that: be a kind of heat exchanger tube that is arranged on the condenser sagging plate is simulated bicontinuous tree-shaped layout on described sagging plate simulated bicontinuous tree-shaped pipe bundle type steam condenser, this condenser exists on described sagging plate face apart from 4 times of heat-exchanging tube bundle outer contours to the imaginary cut-off rule of tube center distance, with described imaginary cut-off rule and air cooling steam baffle is the boundary, and described tube sheet plane is divided into the loose branch tube bank of simulated bicontinuous tree district, the intensive branch tube bank of simulated bicontinuous tree district, convergent air cooling tube bank district and the simulated bicontinuous tree trunk shape center district of drawing gas.
The loose branch tube bank of described simulated bicontinuous tree district, be positioned at the outside of described imaginary cut-off rule, be divided into the loose branch tube bank of the simulated bicontinuous tree in top district, the simulated bicontinuous tree in bottom loose branch tube bank district and the loose branch tube bank of the simulated bicontinuous tree in bottom district three parts, wherein, there is the convergent shape space between bionical dendriform tube bank that is tilted to and the bionical branch that is tilted in the loose branch tube bank of the simulated bicontinuous tree in top district, there is the convergent shape space between the bionical branch of the bionical dendriform tube bank of level and level in the loose branch tube bank of the simulated bicontinuous tree in bottom district, and there is the convergent shape space between downward bionical dendriform tube bank and downward bionical branch in the loose branch tube bank of the simulated bicontinuous tree in bottom district.
The intensive tube bank of described simulated bicontinuous tree district, be positioned at the inboard of described imaginary cut-off rule, and the air cooling steam baffle outside is close in the intensive tube bank of the simulated bicontinuous tree of part district, the district of drawing gas, the simulated bicontinuous tree trunk shape center that the inside in the intensive tube bank of simulated bicontinuous tree district and convergent air cooling tube bank district one of the envelope in bottom are interconnected.
Described convergent air cooling tube bank district, be positioned at the middle and lower part of the simulated bicontinuous tree of described simulated bicontinuous tree-shaped pipe bundle, about convergent air cooling tube bank district an air cooling steam baffle is arranged respectively, described two air cooling steam baffles make air cooling tube bank district constitute the zone of a convergent, an evacuation tube is arranged at the top in convergent air cooling tube bank district, draws gas to distinguish with simulated bicontinuous tree trunk shape center and be connected in the bottom in convergent air cooling tube bank district.
The district of drawing gas, described simulated bicontinuous tree trunk shape center is positioned at the inside in the intensive tube bank of described simulated bicontinuous tree district, is communicated with the bottom in simulated bicontinuous tree intensive tube bank district and convergent air cooling tube bank district respectively.
In described simulated bicontinuous tree-shaped pipe bundle type steam condenser, the steam that steam turbine is discharged enters simulated bicontinuous tree-shaped pipe bundle between the outermost heat exchange tube of simulated bicontinuous tree-shaped pipe bundle, steam is cooled in the loose branch tube bank of the simulated bicontinuous tree in the simulated bicontinuous tree-shaped pipe bundle district of outermost tube bank district and condensation makes steam flow rate descend rapidly, continue to be cooled and condensation in the intensive tube bank of simulated bicontinuous tree district then, draw gas through simulated bicontinuous tree trunk shape center again to distinguish and collect, flow to convergent air cooling tube bank district then further is cooled from the bottom that the tube bank of convergent air cooling is distinguished, last remaining a small amount of vapour gas mixture is extracted out by vavuum pump through the evacuation tube on top, convergent air cooling tube bank district, makes condenser keep certain vacuum.
Described simulated bicontinuous tree-shaped pipe bundle can be up and down to a minute cooling water two-tube-pass.Described simulated bicontinuous tree-shaped pipe bundle is provided with a plurality of zigzag branch journey steam baffles at the middle part to the simulated bicontinuous tree-shaped pipe bundle that divides up and down for up and down to minute cooling water two-tube-pass the time.
The simulated bicontinuous tree-shaped span accounting of described simulated bicontinuous tree-shaped pipe bundle is 0.3-0.4, described simulated bicontinuous tree-shaped span accounting is B2/ (B1+B2+B3), wherein: B1 is the medium line of a bionical tree-like trunk and the distance of nearest inner walls, B2 is that the distance of the medium line of 2 bionical tree-like trunks in the simulated bicontinuous tree-shaped pipe bundle is simulated bicontinuous tree-shaped span, and B3 is the medium line of another bionical tree-like trunk of simulated bicontinuous tree-shaped pipe bundle and the distance between the condenser shell assembly cross-section center line.
Described simulated bicontinuous tree-shaped pipe bundle depth-width ratio is H/B=1.1-2.0, and wherein: H is the height of simulated bicontinuous tree-shaped pipe bundle, and B is the width of simulated bicontinuous tree-shaped pipe bundle.
The zone of reasonableness of the space mean permeability E/F of described simulated bicontinuous tree-shaped pipe bundle is 0.3-0.6, the zone of reasonableness of restraining peripheral average void fraction D/ (C+D) is 0.2-0.4, the zone of reasonableness of bionical branch relative width C/A is 4-12, the zone of reasonableness of relative space D/A is 2.5-5 between bionical branch, wherein: C is the bionical branch width in the loose branch tube bank of simulated bicontinuous tree district, D is the interbank convergent shape space of bionical dendriform, E is a convergent shape space length of penetration, F is the tube bank depth of placement, and A is a tube center distance.
Embodiment two
Figure 13 is the simulated bicontinuous tree-shaped layout schematic diagram of embodiments of the invention two.Figure 14 is embodiments of the invention two simulated bicontinuous tree-shaped pipe bundle sagging plate schematic diagrames.In Figure 13, the tube bank of present embodiment is arranged as symmetry two simulated bicontinuous tree-shaped layouts side by side, and each simulated bicontinuous tree-shaped pipe bundle is made up of 11602 heat exchanger tubes, and the tube bank of present embodiment is arranged and had 23204 heat exchanger tubes.
In Figure 13 and Figure 14, B1 is the medium line of a bionical tree-like trunk and the distance of nearest inner walls, B2 is the distance (simulated bicontinuous tree-shaped span) of the medium line of 2 bionical tree-like trunks in the simulated bicontinuous tree-shaped pipe bundle, B3 is the medium line of another bionical tree-like trunk of simulated bicontinuous tree-shaped pipe bundle and the distance between the condenser shell assembly cross-section center line, B is that the maximum horizontal size of simulated bicontinuous tree-shaped pipe bundle outer contour is the width of simulated bicontinuous tree-shaped pipe bundle, and H is that the maximum vertical size of simulated bicontinuous tree-shaped pipe bundle outer contour is the height of simulated bicontinuous tree-shaped pipe bundle.In the present embodiment, simulated bicontinuous tree-shaped span B2 with the ratio of the corresponding steam channel overall width of this simulated bicontinuous tree-shaped pipe bundle (B1+B2+B3) (be called for short: simulated bicontinuous tree-shaped span accounting) B2/ (B1+B2+B3)=0.381, numerical simulation analysis show that the zone of reasonableness of simulated bicontinuous tree-shaped span accounting is B2/ (B1+B2+B3)=0.3-0.4; (be called for short: the simulated bicontinuous tree-shaped pipe bundle depth-width ratio) H/B=1.52, numerical simulation analysis show that the zone of reasonableness of simulated bicontinuous tree-shaped pipe bundle depth-width ratio is H/B=1.1-2.0 to the ratio of the height H of simulated bicontinuous tree-shaped pipe bundle and the width B of simulated bicontinuous tree-shaped pipe bundle.Excessive or too small simulated bicontinuous tree-shaped span accounting and simulated bicontinuous tree-shaped pipe bundle depth-width ratio may cause the unreasonable of shell side steam flow field, thereby cause the problem such as reduction, the increase of shell side vapour locking of heat exchange.
Embodiment two with the difference of embodiment one is, the condenser shell assembly of the relative embodiment one of condenser shell assembly of embodiment two is narrow and high, and therefore, the simulated bicontinuous tree-shaped pipe bundle depth-width ratio of embodiment two is bigger than embodiment's one.
Embodiment three
Figure 15 is the simulated bicontinuous tree-shaped layout schematic diagram of embodiments of the invention three.Figure 16 is embodiments of the invention two simulated bicontinuous tree-shaped pipe bundle sagging plate schematic diagrames.In Figure 15, the tube bank of present embodiment is arranged as symmetry two simulated bicontinuous tree-shaped layouts side by side.
Embodiment three with the difference of embodiment one is, to a minute cooling water two-tube-pass structure, and the simulated bicontinuous tree-shaped pipe bundle of embodiment three is a cooling water single tube journey structure to the simulated bicontinuous tree-shaped pipe bundle of embodiment one for up and down.
Embodiment four
Figure 17 is the simulated bicontinuous tree-shaped layout schematic diagram of embodiments of the invention four.In Figure 17, the tube bank of present embodiment is arranged as symmetry three simulated bicontinuous tree-shaped layouts side by side.
Embodiment four with the difference of embodiment three is, the tube bank of embodiment four is arranged as symmetry three simulated bicontinuous tree-shaped layouts side by side, and the tube bank of embodiment three is arranged as symmetry two simulated bicontinuous tree-shaped layouts side by side.
Claims (6)
1. simulated bicontinuous tree-shaped pipe bundle type steam condenser, comprise several heat exchanger tubes, the front end tube sheet, sagging plate, the rear end tube sheet, housing unit, the air cooling steam baffle, front water chamber and back hydroecium, it is characterized in that: be a kind of heat exchanger tube that is arranged on the condenser sagging plate is simulated bicontinuous tree-shaped layout on described sagging plate simulated bicontinuous tree-shaped pipe bundle type steam condenser, this condenser exists on described sagging plate face apart from 4 times of heat-exchanging tube bundle outer contours to the imaginary cut-off rule of tube center distance, with described imaginary cut-off rule and air cooling steam baffle is the boundary, described sagging plate face is divided into the loose branch tube bank of simulated bicontinuous tree district, the intensive branch tube bank of simulated bicontinuous tree district, convergent air cooling tube bank district and the simulated bicontinuous tree trunk shape center district of drawing gas, wherein:
The loose branch tube bank of simulated bicontinuous tree district, be positioned at the outside of described imaginary cut-off rule, be divided into the loose branch tube bank of the simulated bicontinuous tree in top district, the simulated bicontinuous tree in bottom loose branch tube bank district and the loose branch tube bank of the simulated bicontinuous tree in bottom district three parts, wherein, there is the convergent shape space between bionical dendriform tube bank that is tilted to and the bionical branch that is tilted in the loose branch tube bank of the simulated bicontinuous tree in top district, there is the convergent shape space between the bionical branch of the bionical dendriform tube bank of level and level in the loose branch tube bank of the simulated bicontinuous tree in bottom district, there is the convergent shape space between downward bionical dendriform tube bank and downward bionical branch in the loose branch tube bank of the simulated bicontinuous tree in bottom district
The intensive branch tube bank of simulated bicontinuous tree district, be positioned at the inboard of described imaginary cut-off rule, and the air cooling steam baffle outside is close in the intensive branch tube bank of the simulated bicontinuous tree of part district, the district of drawing gas, the simulated bicontinuous tree trunk shape center that the inside in the intensive branch of simulated bicontinuous tree tube bank district and convergent air cooling tube bank district one of the envelope in bottom are interconnected
Convergent air cooling tube bank district, be positioned at the middle and lower part of the simulated bicontinuous tree of described simulated bicontinuous tree-shaped pipe bundle, about convergent air cooling tube bank district an air cooling steam baffle is arranged respectively, described two air cooling steam baffles make air cooling tube bank district constitute the zone of a convergent, an evacuation tube is arranged at the top in convergent air cooling tube bank district, draw gas to distinguish with simulated bicontinuous tree trunk shape center and be connected in the bottom in convergent air cooling tube bank district
The district of drawing gas, simulated bicontinuous tree trunk shape center is positioned at the inside in the intensive branch tube bank of described simulated bicontinuous tree district, is communicated with the bottom that simulated bicontinuous tree intensive branch tube bank district and the tube bank of convergent air cooling are distinguished respectively,
In described simulated bicontinuous tree-shaped pipe bundle type steam condenser, the steam that steam turbine is discharged enters simulated bicontinuous tree-shaped pipe bundle between the outermost heat exchange tube of simulated bicontinuous tree-shaped pipe bundle, steam is cooled in the loose branch tube bank of the simulated bicontinuous tree in the simulated bicontinuous tree-shaped pipe bundle district of outermost tube bank district and condensation makes steam flow rate descend rapidly, continue to be cooled and condensation in the intensive branch tube bank of simulated bicontinuous tree district then, draw gas through simulated bicontinuous tree trunk shape center again to distinguish and collect, flow to convergent air cooling tube bank district then further is cooled from the bottom that the tube bank of convergent air cooling is distinguished, last remaining a small amount of vapour gas mixture is extracted out by vavuum pump through the evacuation tube on top, convergent air cooling tube bank district, makes condenser keep certain vacuum.
2. a kind of simulated bicontinuous tree-shaped pipe bundle type steam condenser according to claim 1 is characterized in that: described simulated bicontinuous tree-shaped pipe bundle is up and down to a minute cooling water two-tube-pass, or cooling water single tube journey.
3. a kind of simulated bicontinuous tree-shaped pipe bundle type steam condenser according to claim 1, it is characterized in that: the simulated bicontinuous tree-shaped span accounting of described simulated bicontinuous tree-shaped pipe bundle is 0.3-0.4, described simulated bicontinuous tree-shaped span accounting is B2/ (B1+B2+B3), wherein: B1 is the medium line of a bionical tree-like trunk and the distance of nearest inner walls, B2 is the distance of the medium line of 2 bionical tree-like trunks in the simulated bicontinuous tree-shaped pipe bundle, be simulated bicontinuous tree-shaped span, B3 is the medium line of another bionical tree-like trunk of simulated bicontinuous tree-shaped pipe bundle and the distance between the condenser shell assembly cross-section center line.
4. a kind of simulated bicontinuous tree-shaped pipe bundle type steam condenser according to claim 1, it is characterized in that: described simulated bicontinuous tree-shaped pipe bundle depth-width ratio is H/B=1.1-2.0, wherein: H is the height of simulated bicontinuous tree-shaped pipe bundle, and B is the width of simulated bicontinuous tree-shaped pipe bundle.
5. a kind of simulated bicontinuous tree-shaped pipe bundle type steam condenser according to claim 1, it is characterized in that: the zone of reasonableness of the space mean permeability E/F of described simulated bicontinuous tree-shaped pipe bundle is 0.3-0.6, the zone of reasonableness of restraining peripheral average void fraction D/ (C+D) is 0.2-0.4, the zone of reasonableness of bionical branch relative width C/A is 4-12, the zone of reasonableness of relative space D/A is 2.5-5 between bionical branch, wherein: C is the bionical branch width in the loose branch tube bank of simulated bicontinuous tree district, D is the interbank convergent shape space of bionical dendriform, E is a convergent shape space length of penetration, F is the tube bank depth of placement, and A is a tube center distance.
6. according to claim 1 or the described a kind of simulated bicontinuous tree-shaped pipe bundle type steam condenser of claim 2, it is characterized in that: described simulated bicontinuous tree-shaped pipe bundle is provided with a plurality of zigzag branch journey steam baffles at the middle part to the simulated bicontinuous tree-shaped pipe bundle that divides up and down for up and down to minute cooling water two-tube-pass the time.
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| CN102261855B (en) * | 2011-06-09 | 2012-12-26 | 清华大学 | Double-bionic tree-shaped pipe bundle type condenser of umbrella-shaped air cooling area |
| CN104266501B (en) * | 2014-10-17 | 2017-04-12 | 上海电力学院 | Narrow-band concurrent steam condenser tube bundle with dual-trapezoid air cooling region |
| CN105258526B (en) * | 2015-10-30 | 2017-10-13 | 济南达能动力技术有限责任公司 | A kind of pair of cooling medium condenser |
| CN106288845B (en) * | 2016-09-27 | 2018-04-10 | 德阳东汽电站机械制造有限公司 | A kind of condenser of novel pipe laying mode |
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| GB261437A (en) * | 1925-06-12 | 1926-11-12 | Conrad Edward Howe Verity | Improvements in steam condensers |
| FR1391661A (en) * | 1961-10-25 | 1965-03-12 | Fives Penhoet | Steam condenser |
| EP0729000A1 (en) * | 1995-02-23 | 1996-08-28 | Gec Alsthom Delas | Tube bundle for steam condenser |
| CN1896675A (en) * | 2006-06-29 | 2007-01-17 | 上海交通大学 | Branch-shaped tubing-beam module of side steam-flow condenser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB261437A (en) * | 1925-06-12 | 1926-11-12 | Conrad Edward Howe Verity | Improvements in steam condensers |
| FR1391661A (en) * | 1961-10-25 | 1965-03-12 | Fives Penhoet | Steam condenser |
| EP0729000A1 (en) * | 1995-02-23 | 1996-08-28 | Gec Alsthom Delas | Tube bundle for steam condenser |
| CN1896675A (en) * | 2006-06-29 | 2007-01-17 | 上海交通大学 | Branch-shaped tubing-beam module of side steam-flow condenser |
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