CN103924819B - A kind of thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure - Google Patents
A kind of thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure Download PDFInfo
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Abstract
A kind of thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure, comprise outer support mechanism and frp lining, it is characterized in that: frp lining is by the overall inner core of through being tightly connected one of the multistage glass fibre reinforced plastic cylinder of sectional making, frp lining arranges a circle reinforcing rib at interval of a segment distance, and a non-metal expansion joint is set at interval of a segment distance, is respectively arranged with support node at the differing heights of wet chimney.The wet chimney of frp lining of the present invention is the significant technology innovation of Wet chimney antiseptic project.The smoke exhaust barrel aseptic technic scheme of whole glass steel liner, solves the knotty problem of seepage corrosion in Wet chimney antiseptic project, and this is significant technology innovation and next step steam power station smoke evacuation technological development direction of Wet chimney antiseptic project.
Description
Technical field
The present invention relates to a kind of steam power station Wet chimney, particularly a kind of wet chimney with fire retardant, anticorrosive.
Background technology
The chimney stack (highly general at 180-270 rice) of steam power station is important structure, and according to relevant regulations, it should meet the requirement of 50 years structure design base periods and process system 30-35 projected life.Current domestic steam power station Wet chimney corrosion leakage problem is serious.Due to the quality of chimney anticorrosion material itself, the control of work progress, the management of engineering, and the reason such as operation condition is changeable, a large amount of desulfuration chimney is caused to occur damage in various degree and Seepage.The total institute of China Power planning and designing 2009, by the chimney investigation to 226 desulfurizing fly ash, comprises six large classes, 13 kinds of Corrosion prevention scheme.Reflection especially with the film class coating such as polyureas, Sa Weizhen, OM coating and domestic foam glass brick carry out corrosion-resistant chimney occur cracking, wash away or obscission the most serious.Its ratio gone wrong is respectively polyureas and Sa Weizhen accounts for 90%, and domestic foam glass brick accounts for 50%, OM coating and accounts for more than 60%; The acid solution seepage that employing acid resistant adhesive mortar builds acid resisting brick chimney by laying bricks or stones is even more serious.The result of feedback reflects that China's current desulfuration chimney antiseptic project produced problem is more, relates to face comparatively wide, occurs that the ratio of seepage is higher, so select safe and reliable Corrosion prevention scheme to be the task of top priority of current chimney anticorrosion.
Wet chimney corrosion-resistant key is that liner is made Integral sealing, does waterproof, leakproof, antiseepage with anti-corrosion material.Due to source and composition extremely diversity and the complexity of fire coal, in flue gas, corrosive medium is also just very complicated.The anti-corrosion material of smoke exhaust barrel selects glass, pottery, resin composite materials (FiberglassReinforcedPlastics) and alloy-steel plate four class at present.Not only cost is high for conventional metal species anti-corrosion material (comprising titanium steel and other alloys), but also the corrosive medium that can not solve multiple fire coal corrodes.Titanium alloy composite panel is to the antiseptic power of some acid medium also defectiveness.Glass and ceramic-like anti-corrosion material we put into practice stickup foam glass brick and foam ceramic tile scheme, it can not be made the protective system of bulk or entirety, due to difficult operability of constructing, the overall tightness of anticorrosive coat is difficult to ensure, occurs that leakage scenarios is a lot.Therefore glass fiber reinforced plastic (FRP) smoke exhaust barrel is adopted by fast development America and Europe in recent years.FRP compares with steel, and FRP has the features such as lightweight, extra-strong corrosion resistant, and as the substitute of steel, FRP is just causing gazing at of people.
At home and abroad, glass fiber reinforced plastic is widely used in the anticorrosion equipments such as chemical industry, metallurgy, boats and ships and space flight and engineering, but how glass fiber reinforced plastic is applied in the superelevation smoke exhaust barrel of power industry, current various places are all in test with in exploring, how by the Wet chimney frp lining fixed installation of comparatively lightweight, and the Total Product design of fiber glass reinforced plastic smoke flue, material selection, Each part design, connecting structure, lifting install etc. there is no mature technology report.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the object of this invention is to provide a kind of thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure.
The object of the present invention is achieved like this: a kind of thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure, comprise outer support mechanism and frp lining, it is characterized in that: frp lining is by the overall inner core of through being tightly connected one of the multistage glass fibre reinforced plastic cylinder of sectional making, frp lining arranges a circle reinforcing rib at interval of a segment distance, and a non-metal expansion joint is set at interval of a segment distance, is respectively arranged with support node at the differing heights of wet chimney.
Object of the present invention can also realize like this: described support node structure is, be provided with the liner bracket of evagination at frp lining, liner bracket is arranged with steel perimeter beam, and liner bracket inside is filled with hard polyurethane material; Outer support mechanism connects a bearing platform, and bearing platform is provided with ring beam support, and ring beam support is provided with prefabricated bracket, and prefabricated bracket front support lives steel perimeter beam.
The structure of described non-metal expansion joint is, connects the flexible joint of the corrosion-and high-temp-resistant of a W shape between two sections of frp linings.
The structure of described reinforcing rib is, arranging a cross section at frp lining outer wall is outer convex or trapezoidal muscle circle, is filled with hard polyurethane material in the space that muscle circle surrounds; Spacing L≤1.5D between two adjacent reinforcing ribs, wherein D is the internal diameter of frp lining.
Also be respectively arranged with at the differing heights of wet chimney and only shake a little, only the structure of rolling point is, outer support mechanism connects one and only shakes platform, only shake platform is provided with successively and only shake support, cantilever connector, cantilever connector connects and only shakes cantilever, be provided with and only shake arm support only shaking cantilever outer end, the outer wall of frp lining is pressed close in arm support of only shaking, and prevents frp lining from rocking.
Described outer support mechanism is steel concrete urceolus or supporting frame with steel structure.
Described wet chimney is segmentation self-support structure, Each part ratio is, wet chimney elevation of top 210m, arranges support node at 65m, 115m, 165m place, at each support node upper end configuration non-metal expansion joint, frp lining internal diameter D=7m, wall thickness t=19mm, sectional making, every section of 5-7m, lift splicing successively, joint sticks with paste technique, the spacing L=5m between adjacent two reinforcing ribs for wet.
The present invention has following remarkable technological progress:
1, the wet chimney of employing frp lining of the present invention is the significant technology innovation of Wet chimney antiseptic project.Put into practice for many years based on applicant, all serious leakage is there is in other multiple chimney anticorrosion schemes in the Wet chimney of steam power station, have the smoke exhaust barrel aseptic technic scheme of whole glass steel liner of the present invention only, in Wet chimney antiseptic project, solve the knotty problem of seepage corrosion, this is significant technology innovation and next step steam power station smoke evacuation technological development direction of Wet chimney antiseptic project.
2, adopt whole glass steel inner core scheme of the present invention, empirical evidence flue-gas temperature in wet desulphurization chimney is low, flue gas deep-etching, adopt
withwhole glass steel inner core scheme is best selection, in antiseptic property, durable years and Technological Economy etc., have obvious advantage.
3, the design adopting glass reinforced plastic inner cylinder smoke exhaust barrel of the present invention is reliable.Specifically:
(1) there are Its Relevant Technology Standards and associated documents support;
(2) fibreglass epoxy stove-pipe structure-design technique of the present invention is ripe, and the results show, can accomplish that fibreglass epoxy stove-pipe structure is safe and reliable in intensity, entirety and local stability completely.
(3) fibreglass epoxy stove-pipe temperature tolerance: can meet smoke exhaust barrel design pressure ± 500Pa, Wet chimney is cigarette temperature-40 DEG C ~ 65 DEG C when not establishing bypass.Current national environmental protection department strictly controls to arrange bypass, adopts glass fiber reinforced plastic Wet chimney can meet the demands completely from Material selec-tion, reduction construction investment aspect.
(4) fibreglass epoxy stove-pipe durability: it is 25 years that epoxy vinyl ester resin is wound around the FRP smoke pipe service life made, the outer brush anti-ultraviolet paint of weather part.
(5) the fiber selected of the present invention and resin are a kind of fire-retardant bodies well, in November, 2011 has carried out FRP combustibility test in " National Fire building materials quality Supervision Test Center " (Chengdu), testing result consistent with theoretical experimental result (oxygen index (OI) of material, all between 31-33, is nonflammable material); Resistance to 40% sulfuric acid corrosion and ultra-violet resistance can be good.
(6) the constructing technology scheme mature and reliable of FRP smoke exhaust barrel connection segment node of the present invention.
(7) the construction costs of FRP smoke exhaust barrel of the present invention was considered from the life-cycle of engineering structures, and total cost is more competitive, because FRP material resistance to chemical corrosion is very outstanding, later maintenance workload is very little.
(8) the present invention has achieved abundant ripe experience in the making and installation of FRP smoke exhaust barrel, can ensure high-quality and safe construction completely in practice.
Accompanying drawing explanation
Fig. 1 is thermal power plant of the present invention Wet chimney structural representation
Fig. 2 is support node structural representation figure
Fig. 3 is non-metal expansion joint structural representation
Fig. 4 is reinforcing rib structure schematic diagram
Dot structure schematic diagram is shaken till Fig. 5
Fig. 6 is connection segment joint design schematic diagram
Detailed description of the invention
In accompanying drawing, each part numbers is as follows: outer support mechanism 10, frp lining 20, reinforcing rib 30, non-metal expansion joint 40, support node 50, liner bracket 51, steel perimeter beam 52, prefabricated bracket 53, ring beam support 54, bearing platform 55, only rolling point 60, only rolling platform 61, only rolling support 62, cantilever connector 63, the outstanding cantilever 64 that only shakes, the arm that only shakes supports 65, hard polyurethane material 70.
The present invention is a kind of thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure, and structure is made up of two parts: outer support mechanism 10 and frp lining 20.Frp lining 20 is by the overall inner core of through being tightly connected one of the multistage glass fibre reinforced plastic cylinder of sectional making, frp lining 20 arranges a circle reinforcing rib 30 at interval of a segment distance, and a non-metal expansion joint 40 is set at interval of a segment distance, is respectively arranged with support node 50 at the differing heights of wet chimney.
Outer support mechanism 10 can be steel concrete urceolus or supporting frame with steel structure.
To wet chimney for the steam power station highly reaching more than 200 meter, antiseptic fire-retardation requires high, and the height of its superelevation is also a vital design key for its support structure.The present invention is provided with multiple support node at the differing heights of chimney, support node 50 structure is, be provided with the liner bracket 51 of evagination at frp lining 20, liner bracket 51 is arranged with steel perimeter beam 52, and liner bracket 51 inside is filled with hard polyurethane material 70; Outer support mechanism 10 connects a bearing platform 55, and bearing platform 55 is provided with ring beam support 54, ring beam support 54 is provided with prefabricated bracket 53, and prefabricated bracket 53 front support lives steel perimeter beam 52.
The structure of non-metal expansion joint 40 is, connects the flexible joint of the corrosion-and high-temp-resistant of a W shape between two sections of frp linings 20.
The structure of reinforcing rib 30 is, arranging a cross section at frp lining 20 outer wall is outer convex or trapezoidal muscle circle, is filled with hard polyurethane material 70 in the space that muscle circle surrounds; Spacing L≤1.5D between two adjacent reinforcing ribs 30, wherein D is the internal diameter of frp lining 20.
Only rolling point 60 is also respectively arranged with at the differing heights of wet chimney, only the structure of rolling point 60 is, outer support mechanism 10 connects one and stops rolling platform 61, only rolling platform 61 is provided with successively only rolling support 62, cantilever connector 63, cantilever connector 63 connects only rolling cantilever 64, be provided with and only shake arm support 65 only shaking cantilever 64 outer end, the outer wall of frp lining 20 is pressed close in arm support 65 of only shaking, and prevents frp lining 20 from rocking.
Wet chimney is segmentation self-support structure, Each part ratio is, wet chimney elevation of top 210m, arranges support node 50 at 65m, 115m, 165m place, at each support node 50 upper end configuration non-metal expansion joint 40, frp lining 20 internal diameter D=7m, wall thickness t=19mm, sectional making, every section of 5-7m, lift splicing successively, joint sticks with paste technique, the spacing L=5m between adjacent two reinforcing ribs 30 for wet.
Below the description of Related Art that the present invention designs:
(1) main technical standards and associated documents
ASTMD5364 – 93 (2008), the design of coal-burning power plant's glass fiber reinforced plastics chimney lining, manufacture and installation code.
GB/T1446-2005 the generals of test methods for properties of fiberreinforced plastics
GB/T1447-2005 Test method for tensile properties of glass fiberreinforced plastics
GB/T1448-2005 Test method for compressive properties of glass fiberreinforced plastics
GB/T2576-2005 fiber reinforced plastic resin soluble part content test method
GB/T2577-2005 Test method for resin content of glass fiber reinforced plastics
GB/T3854-2005 fibre reinforced plastics Pasteur (Ba Keer) hardness test method
GB/T4202-2001 glass fiber product code name
GB/T18374-2001 reinforcing material term and definition
GB/T17470-1998 fiberglas chopped strand mat
GB/T18370-2001 woven glass roving fabric cloth
GB/T8237-2005 glass fiber reinforced plastics liquid unsaturated polyester resin
HG20696-1999 glass fiber reinforced plastic equipment de-sign specifies
(2) about the structure design of fibreglass epoxy stove-pipe,
1, design condition
Design according to chimney ASTMD5364-93.
Fibreglass epoxy stove-pipe structural analysis and computation adopts finite element analysis software ANSYS to carry out, and describes all chimney shell structures and braced structures with three-dimensional entity model.In computation model, pipeline adopts shell unit to simulate, and reinforcing rib adopts three-dimensional beam element to simulate, and support frame adopts three-dimensional beam element to simulate.
In the Intensity Design of glass fibre reinforced plastic structure component, choosing of global factor of safety K should consider according to following influence factor, sees the following form:
Fiber glass reinforced plastic smoke flue global factor of safety value factor
| A1 | Non-homogeneity and material scatter | 1.0～2.0 |
| A2 | Medium and environment | 1.1～1.8 |
| A3 | Design temperature | 1.0～1.4 |
| A4 | Dynamic load | 1.0～1.1 |
| A5 | Aging | 1.25～2.0 |
| S | Safety factor | 2.0 |
K＝S·A1·A2·A3·A4·A5>4.0。K value is in the scope of 2.75 ~ 22.2.
2, design parameters
FRP smoke exhaust barrel elevation of top 210m of the present invention, be provided with fixed support node at places such as+65m ,+115m ,+165m, segmentation self-support structure configures non-metal expansion joint in upper end, and segmentation overhung construction configures non-metal expansion joint in lower end.FRP smoke exhaust barrel is divided into 34m, 50m, 50m, 45m tetra-sections calculating.FRP chimney lining internal diameter 7000mm, through the thick t=19mm of computational analysis barrel, (deck minimum thickness requires: 10mm), reinforcing rib spacing is within L=5000mm.Below calculate segmentation self-support structure scheme.
| Safety classes of structure | One-level |
| Wind velocity pressure | 0.45kN/m 2(met by 100 years one and consider) |
| Seismic fortification intensity | 8 degree; Basic seismic design acceleration: 0.20g |
| Classification of design earthquake | First group |
| Project site, environment category | II bis-(b) |
| Design temperature | 90℃ |
| Extreme Maximum Temperature in Summer | 42.5℃ |
| Winter Annual lowest climate temperature | -21.0℃ |
3, the determination of FRP inner lining material allowable stress:
Diameter 7000mm chimney FRP inner lining material performance and data
Be calculated as follows: for the FRP chimney lining of uniform thickness, get k
n=0.9
4, LOAD FOR
4.1 static loads calculate:
FRP liner density 2243kg/m
3(comprise and strengthen circle and annex), wet gray density 1281kg/m
3the axial compression stress caused by static load:
4.2 wind loads:
The effect of wind load is not considered when this calculates FRP liner.
4.3 seismic bending moments calculate:
Seismic fortification intensity: 8 degree; Basic seismic design acceleration: 0.20g
Classification of design earthquake: first group
Architectural site partition: II; Environment category: two (b)
Fiber glass reinforced plastic chimney height of lift is 35-50m, needs the impact considering the high vibration shape.This calculates the effect of the inertia force only considering inner core.The impact of main first three vibration shape of consideration, bends by the result of calculation estimation earthquake of first vibration mode, i.e. M
max=1.25M
e1-1
1-1 cross section: σ=± 0.77MPa
2-2 cross section: σ=± 0.77MPa × 1.58/4.5=± 0.27Mpa
The thermal force that the 4.4FRP liner inside and outside wall temperature difference causes:
Winter extreme low temperature-21.0 DEG C, flue gas normal temperature 90 DEG C is extremely 121 DEG C.Calculate FRP liner outside temperature difference Tw: Δ Tw=1 DEG C.Consider special circumstances, get the outside temperature difference Tw=40 DEG C of FRP liner.
α
zfor the axial thermal expansion coefficient of FRP liner, α
z=27 × 10
-61/ DEG C
α
θfor the hoop coefficient of thermal expansion of FRP liner, α
θ=9 × 10
-61/ DEG C
The buckling stress that Δ Tw causes: 5.4MPa
The hoop flexural stress that Δ Tw causes: 4.32MPa
The axial bending intensity of FRP liner
The hoop bending strength of FRP liner
FRP liner thermal stress permissible value:
Axially: long-term
Short-term
Hoop: long-term
Short-term
4.5 external pressures:
By average flue-gas temperature 90 DEG C, because external pressure acts on the hoop compressive stress of FRP cylindrical shell generation: 0.189MPa. is due to the effect of expansion joint, the thermal walking that FRP liner causes due to the temperature difference of condition of work and mounting condition is absorbed, and does not produce thermal stress at FRP liner.
5, the strength check of unfavorable load combination operating mode
5.1 axial compressive stress:
Long duration load combination (1): 3.063MPa< long-term permissible value 12.3MPa, OK
Short-term laod combination (2): 4.037MPa< short-term permissible value 14.1MPa, OK
5.2 hoop compressive stresses:
Long duration load combination (3): 0.206Mpa< long-term permissible value 0.67MPa, OK
5.3 buckling stress
Load Combination (4): 5.9MPa<182MPa, OK (thermal force that the FRP liner inside and outside wall temperature difference causes):
Safety factor proof under 5.4 load combinations operating modes:
Axially, hoop is compression, calculation and check result:
Long-term: 0.34<1, OK; Short-term: 0.36<1, OK
6, the strength check of ribs
Ribs spacing L1:5000mm≤8000mm and≤1.5D
Under design temperature, elasticity modulus of materials is 9 × 10
9pa,
(EI)
s=6.02 × 10
5>=3.64 × 10
5nm
2meet the demands.
7, the vibration checking computations of ring-stiffened shell structure:
For with in the reinforcing line of annular stiffening rib, low-limit frequency result of calculation: 12.6Hz> low-limit frequency requires 2Hz.
8, the compensate for displacement of thermal compensation structure calculates
Maximum temperature under pipeline condition of work and mounting condition becomes: △ T=121-(-21.0)=142 DEG C
Axial Thermal is out of shape: △ l==192mm radial heat distortion: △ l=α=8.96mm
9, FRP chimney design and analysis conclusion
The result of finite element of FRP chimney shows:
Chimney axial shrinkage under load combinations (1) G+A+T+E is maximum, lateral displacement is maximum, axial tension stress is maximum, hoop tensile stress is maximum, axial compressive stress is maximum; Hoop tensile stress, hoop compressive stress, hoop strain stress that is maximum, reinforcing rib are maximum.
Chimney is (50m) maximum collapse value 51.9mm axially;
Lateral displacement maximum value is 14.2mm
Hoop strain value is 0.0283%
Axial strain value is 0.0490%
Axial maximum crushing stress is 7.26Mpa
Axial maximum tension stress is 0.645Mpa
Hoop maximum tension stress is 3.50Mpa
Hoop maximum crushing stress is 2.39Mpa
The maximum stress of reinforcing rib is 1Mpa
Chimney amount of deflection causes primarily of dust stratification, deadweight and earthquake, maximum immunity value 14.2mm
△/L＝14.2/50000＝1/3521<[△/L]＝1/500；
More than calculate and show, in strength analysis, axial stress and circumference stress and axial strain and hoop strain are all lower than its allowable value.Bear maximum dust stratification load at chimney, and with in the coefficient situation of other loads, this chimney and supported design thereof meet intensity and stability requirement.
10, glass fiber reinforced plastic smoke exhaust barrel wall thickness optimum results compares
Several situation result of calculations that smoke exhaust barrel wall thickness is 14mm, 16mm, 18mm, 19mm are compared: under unfavorable load combinations operating mode, carry out the check of barrel Strength Safety, because axis, hoop are compression, check by following formula:
Result of calculation sees the following form:
Rule of thumb, under short term load and wind load and seismic (seismal effect, urceolus has stronger effect to inner core.Not considering that the numerical value of urceolus impact K in combination is checked should be not excessive, for ensureing safety wish degree, getting 19mm.Can accomplish that fibreglass epoxy stove-pipe structure is safe and reliable in intensity, entirety and local stability completely.
(3) temperature tolerance of fibreglass epoxy stove-pipe
According to the practical experience of the actual conditions of engineering and engineering in the past, chimney design pressure consideration ± 500Pa.Wet chimney considers cigarette temperature-40 DEG C ~ 65 DEG C in not establishing the situation down smoke-discharging barrel structure of bypass to design; Cigarette temperature-40 DEG C ~ 130 DEG C are considered in establishing the situation down smoke-discharging barrel structure of bypass to design.Strictly control to arrange bypass from national environmental protection agencies dictate coal-fired power plant at present, Wet chimney is more suitable for adopting fibreglass epoxy stove-pipe.From Material selec-tion, reduce construction investment aspect advantageously.
ASTM specification be suitable for temperature range be normal operating temperature not higher than 93 DEG C, in short-term abnormal high temperature not higher than 121 DEG C.It is 120 DEG C to the highest design temperature of heat resistance good vinyl esters unsaturated polyester (UP) glass steel.In the design, when environment temperature may exceed the conventional scope of application, should select resistant to elevated temperatures resin material, if the DERAKANE470-300 epoxy vinyl ester resin casting matrix heat distortion temperature HDT after solidification is 150 DEG C, and the HDT of DERAKANE470HT-400 can reach 180 DEG C.Due to the variability of FRP material property, each engineering only has the parameter just having after shaping and determine.
This engineering selected materials is E-CR fiber+DERAKANEMOMENTUM510C-350c resin, 80 DEG C of hot strength decay about 10%.120 DEG C of hot strength decay are greater than 25%.
(4) durability of fibreglass epoxy stove-pipe
According to the design service life of external FRP chimney design and application life and domestic glass fiber reinforced plastic smoke pipe, constructed and structure design by rational laying, the test data of the standards such as reduction reference BS4994, ASTMD5364 of FRP long-term behaviour and producer, the application life that the reduction coefficient that FRP performance decays in time can calculate FRP chimney is 25 years.
(5) refractory ability of fibreglass epoxy stove-pipe
Under certain conditions, polymer is all flammable.Not only fibreglass epoxy stove-pipe has fire-resistant fire safety problem, and the sizing material that current chimney anticorrosion engineering adopts, coating all have problems.Have the problem of field control, also have resin Material Selection, these are all soluble.
Home and abroad theory and practice research for many years shows, oxygen index (OI) characterizes the flammability test belonged in combustion test, and oxygen index (OI) is the important indicator of glass-reinforced plastic material combustibility.Oxygen index (OI) refers under prescribed conditions, and solid material, in oxygen, nitrogen mixed gas stream, maintains the minimum oxygen content needed for smooth combustion.
Oxygen index (OI) height represents that material is nonflammable, and the low expression material of oxygen index (OI) easily burns.The oxygen index (OI) (LOI) of material is as follows with the corresponding relation of its anti-flammability:
(1) LOI<23 is flammable
(2) LOI24-28 is slightly fire-retardant
(3) LOI29-35 is fire-retardant
(4) LOI>36 high flame retardant
Glass fiber reinforced plastic oxygen index (OI) test methods test methods forms CNS, and this standard is equal to developed country oxygen index (OI) testing standard.
(1) CNS: GB/T8924-2005.Fibre reinforced plastics combustibility test method oxygen index method.
(2) U.S. material development test association criterion: ASTMD2863-06a, StandardTestMethodforMeasuringtheMinimumOxygenConcentrat iontoSupportCandle-LikeCombustionofPlastics (OxygenIndex).
(3) CNS: GB/T8624-2006, constructional materials and product burns grading performance.
The fiber that this engineering is selected and resin are a kind of fire-retardant bodies well, in November, 2011 has carried out FRP combustibility test in " National Fire building materials quality Supervision Test Center " (Chengdu), testing result consistent with theoretical experimental result (oxygen index (OI) of material, all between 31-33, is nonflammable material); Resistance to 40% sulfuric acid corrosion and ultra-violet resistance can be good.
(6) connection of FRP smoke exhaust barrel segmented node
FRP smoke exhaust barrel sectional making, every section of 5-7m, every section lifts splicing successively, and joint sticks with paste technique for wet.
The making of docking port is most important, and docking port must carry out inside and outside reinforcement to ensure bulk strength.Docking port makes to possess and makes identical environment temperature, humidity etc. with flue cylindrical shell, and docking port carries out port process, alignment interface.Interface gaps is not more than 3mm, and body concentricity is not more than 10mm, needs bonding surface to carry out grinding process, has not allowed other spots of water, wet goods.Should operate in strict accordance with technique, otherwise the structural strength of integral product may be caused not enough.In Flue duct design for nicotinic acids engineering.When quality managemant puts in place, this connected mode is feasible and reliable.
Socket interface adopts dock, and the material that outside adopts shortly cuts felt+glass fabric, and hand has been stuck with paste.Socket interface, it is inside and outside all strengthens.Cooperative reduction coefficient, gets c=0.75.
The Laminate construction thickness design appraising and deciding interface as calculated meets stretching, compression requirement for bearing capacity.
The interlaminar shear strength of interface adopts the shear strength of resin, is about 10MPa (generally at more than 10MPa).The reduction coefficient of socket interface interface laying duty work, gets c=0.75, and it is inside and outside all strengthens, so surface of shear is two, safety factor gets 8.Interface width W (mm) calculates needs 312mm to be less than design interface width 350mm, meets the demands.
Claims (7)
1. thermal power plant's Wet chimney of a fire retardant, anticorrosive glass fibre reinforced plastic structure, comprise outer support mechanism (10) and frp lining (20), frp lining (20) is by the overall inner core of through being tightly connected one of the multistage glass fibre reinforced plastic cylinder of sectional making, frp lining (20) arranges a circle reinforcing rib (30) at interval of a segment distance, and a non-metal expansion joint (40) is set at interval of a segment distance, is respectively arranged with support node (50) at the differing heights of wet chimney;
It is characterized in that: described support node (50) structure is, the liner bracket (51) of evagination is provided with at frp lining (20), liner bracket (51) is arranged with steel perimeter beam (52), and liner bracket (51) inside is filled with hard polyurethane material (70); Outer support mechanism (10) connects a bearing platform (55), and bearing platform (55) is provided with ring beam support (54), ring beam support (54) is provided with prefabricated bracket (53), and prefabricated bracket (53) front support lives steel perimeter beam (52).
2. thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure according to claim 1, is characterized in that: the structure of described non-metal expansion joint (40) is between two sections of frp linings (20), connect the flexible joint of the corrosion-and high-temp-resistant of a W shape.
3. thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure according to claim 1, it is characterized in that: the structure of described reinforcing rib (30) is, arranging a cross section at frp lining (20) outer wall is outer convex or trapezoidal muscle circle, is filled with hard polyurethane material (70) in the space that muscle circle surrounds; Spacing L≤1.5D between two adjacent reinforcing ribs (30), wherein D is the internal diameter of frp lining (20).
4. thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure according to claim 1, it is characterized in that: be also respectively arranged with at the differing heights of wet chimney and only shake point (60), the structure of point (60) of only shaking is, outer support mechanism (10) connects one and only shakes platform (61), only shake platform (61) is provided with successively and only shake support (62), cantilever connector (63), cantilever connector (63) connects and only shakes cantilever (64), be provided with and only shake arm support (65) only shaking cantilever (64) outer end, arm support (65) that only shakes presses close to the outer wall of frp lining (20), prevent frp lining (20) from rocking.
5. thermal power plant's Wet chimney of the fire retardant, anticorrosive glass fibre reinforced plastic structure according to claim 1 or 4, is characterized in that: described outer support mechanism (10) is steel concrete urceolus or supporting frame with steel structure.
6. according to thermal power plant's Wet chimney of the fire retardant, anticorrosive glass fibre reinforced plastic structure of claim 1-4 described in one of them, it is characterized in that: described wet chimney is segmentation self-support structure, Each part ratio is, wet chimney elevation of top 210m, at 65m, 115m, 165m place arranges support node (50), in each support node (50) upper end configuration non-metal expansion joint (40), frp lining (20) internal diameter D=7m, wall thickness t=19mm, sectional making, every section of 5-7m, lift splicing successively, joint sticks with paste technique for wet, spacing L=5m between adjacent two reinforcing ribs (30).
7. thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure according to claim 5, it is characterized in that: described wet chimney is segmentation self-support structure, Each part ratio is, wet chimney elevation of top 210m, support node (50) is set at 65m, 115m, 165m place, in each support node (50) upper end configuration non-metal expansion joint (40), frp lining (20) internal diameter D=7m, wall thickness t=19mm, sectional making, every section of 5-7m, lifts splicing successively, joint sticks with paste technique, the spacing L=5m between adjacent two reinforcing ribs (30) for wet.
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| CN105804482A (en) * | 2016-05-09 | 2016-07-27 | 江苏格普新材料有限公司 | Glass-fiber-reinforced-plastic chimney pipe |
| CN105935548A (en) * | 2016-06-03 | 2016-09-14 | 北京中航泰达环保科技股份有限公司 | High efficiency desulfurization and dust removal integrated device |
| CN106245979A (en) * | 2016-08-29 | 2016-12-21 | 江苏利保科技股份有限公司 | A kind of fiber glass reinforced plastic chimney only shakes device |
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