CN103924819A - Flame-retardant and anticorrosion wet chimney with glass fiber reinforced plastic structure for thermal power plant - Google Patents
Flame-retardant and anticorrosion wet chimney with glass fiber reinforced plastic structure for thermal power plant Download PDFInfo
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Abstract
The invention discloses a flame-retardant and anticorrosion wet chimney with a glass fiber reinforced plastic structure for a thermal power plant. The flame-retardant and anticorrosion wet chimney comprises an outer support mechanism and a glass fiber reinforced plastic lining, and is characterized in that the glass fiber reinforced plastic lining is an integral inner barrel, a plurality of sections of glass fiber reinforced plastic barrels which are manufactured in a sectioned manner are hermetically connected with one another to form the integral inner barrel, reinforcing ribs are arranged on the glass fiber reinforced plastic lining at intervals, nonmetal expansion joints are arranged on the glass fiber reinforced plastic lining at intervals, and support joints are respectively arranged at different altitudes of the wet chimney. The flame-retardant and anticorrosion wet chimney has the advantages that the wet chimney with the glass fiber reinforced plastic lining is radical technical innovation of wet chimney anticorrosion engineering; difficult problems of leakage and corrosion can be solved in wet chimney anticorrosion engineering by an anticorrosion technical solution for the smoke exhaust chimney with the integral glass fiber reinforced plastic lining, and the flame-retardant and anticorrosion wet chimney is the radical technical innovation of the wet chimney anticorrosion engineering and indicate a next-step development direction for smoke exhaust technologies for thermal power plants.
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 of steam power station (highly generally at 180-270 rice) is important structure, and according to relevant regulations, it should meet the requirement of 50 years base periods of structure design and process system 30-35 projected life.The wet chimney corrosion leakage problem in current domestic steam power station is serious.Due to quality, the control of work progress, the management of engineering of chimney anticorrosion material itself, and the reason such as operation condition is changeable, cause a large amount of desulfuration chimneys to occur damage and Seepage in various degree.The total institute of China Power planning and designing comprises 13 kinds of anticorrosion schemes of six large classes by the chimney of 226 desulfurization transformations is investigated in 2009.Reflection especially with the film class coating such as polyureas, Sa Weizhen, OM coating and domestic foam glass brick carry out corrosion-resistant chimney there is cracking, wash away or obscission the most serious.Its ratio going 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%; Adopt acid resistant adhesive mortar to build the acid solution seepage of acid resisting brick chimney by laying bricks or stones even more serious.The result of feedback reflects the more problems that the current desulfuration chimney antiseptic project of China occurs, involvement aspect is wider, occurs that the ratio of seepage is higher, so select safe and reliable anticorrosion scheme, is the task of top priority of current chimney anticorrosion.
The key of wet chimney anticorrosion is that liner is made to Integral sealing, with anti-corrosion material, does waterproof, leakproof, antiseepage.Due to coal-fired source and composition extremely diversity and complexity, in flue gas, corrosive medium is also just very complicated.The anti-corrosion material of smoke evacuation cylinder is selected glass, pottery, resin composite materials (Fiberglass Reinforced Plastics) and alloy-steel plate four classes at present.Not only cost is high for conventional metal species anti-corrosion material (comprising titanium steel and other alloys), but also can not solve the corrosive medium erosion of multiple fire coal.Titanium alloy composite panel is to the antiseptic power of some acid medium also defectiveness.We had put into practice stickup foam glass brick and foam ceramic tile scheme glass and ceramic-like anti-corrosion material, it can not make bulk or whole protective system, due to the difficult operability of construction, the overall tightness of anticorrosive coat is difficult to guarantee, occurs that seepage situation is a lot.Therefore the cylinder of glass fiber reinforced plastic (FRP) smoke evacuation is in recent years adopted by fast-developing American-European.FRP compares with steel, the feature such as that FRP has is 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 on the superelevation smoke evacuation cylinder of power industry, various places are all in test and exploring at present, how by the comparatively wet chimney frp lining fixed installation of lightweight, and the product global design of fiber glass reinforced plastic smoke flue, material selection, each several part structure design, connect structure, lifting and install etc. and 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 wet chimney of thermal power plant of fire retardant, anticorrosive glass fibre reinforced plastic structure.
The object of the present invention is achieved like this: a kind of wet chimney of thermal power plant of fire retardant, anticorrosive glass fibre reinforced plastic structure, comprise outer support mechanism and frp lining, it is characterized in that: frp lining is multistage glass fibre reinforced plastic cylinder by a sectional making whole inner core through being tightly connected, on frp lining, at interval of a segment distance, one circle reinforcing rib is set, and at interval of a segment distance, a non-metal expansion joint is set, at the differing heights of wet chimney, is respectively arranged with support node.
Object of the present invention can also realize like this: described support node structure is, is provided with the liner bracket of evagination at frp lining, and liner bracket is arranged with steel perimeter beam, and liner bracket inner filling has hard polyurethane ester material; Outer support mechanism connects a bearing platform, and ring beam support is installed on bearing platform, and prefabricated bracket is installed on ring beam support, and prefabricated bracket front end supports steel perimeter beam.
The structure of described non-metal expansion joint is between two sections of frp linings, to connect the flexible joint of the corrosion-and high-temp-resistant of a W shape.
The structure of described reinforcing rib is that at frp lining outer wall, one cross section being set is outer convex or trapezoidal muscle circle, in the space that muscle circle surrounds, is filled with hard polyurethane ester material; Spacing L≤1.5D between two adjacent reinforcing ribs, the internal diameter that wherein D is frp lining.
At the differing heights of wet chimney, be also respectively arranged with and only shake a little, only the structure of rolling point is, outer support mechanism connects one and only shakes platform, only shake to be provided with successively on platform and only shake support, cantilever connector, cantilever connector connects and only to shake cantilever, be provided with and only shake arm support only shaking cantilever outer end, the arm that only shakes supports the outer wall of frp lining, prevents that 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 several part structure proportion is that wet chimney top absolute altitude 210m, arranges support node at 65m, 115m, 165m place, at each support node upper end configuration non-metal expansion joint, frp lining inside diameter D=7m, barrel thickness t=19mm, sectional making, every section of 5-7m, lifting splicing successively, joint is wet technique, the spacing L=5m between adjacent two reinforcing ribs of sticking with paste.
The present invention has following remarkable technological progress:
1, adopting the wet chimney of frp lining of the present invention is the significant technology innovation of wet chimney anticorrosion engineering.Based on applicant, put into practice for many years, in the wet chimney in steam power station, all there is serious leakage in other multiple chimney anticorrosion schemes, have the smoke evacuation cylinder aseptic technic scheme of whole glass steel liner of the present invention only, in wet chimney anticorrosion engineering, solved 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 anticorrosion engineering.
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 in the situation that, adopt
withwhole glass steel inner core scheme is best selection, at aspects such as antiseptic property, durable years and Technological Economies, has obvious advantage.
3, it is reliable adopting the design of glass reinforced plastic inner cylinder smoke evacuation cylinder of the present invention.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 aspect intensity, integral body and local stability completely.
(3) fibreglass epoxy stove-pipe temperature tolerance: can meet a smoke evacuation cylinder design pressure ± 500Pa, wet chimney cigarette temperature-40 ℃～65 ℃ in the situation that not establishing bypass.The strict control of national environmental protection department arranges bypass at present, adopts the wet chimney of glass fiber reinforced plastic to select, reduce construction investment aspect from material and can meet the demands completely.
(4) fibreglass epoxy stove-pipe durability: it is 25 years that epoxy vinyl ester resin is wound around FRP smoke pipe service life of making, and weather part is brushed antiultraviolet coating outward.
(5) the fiber that the present invention selects and resin are a kind of good fire-retardant bodies, carried out FRP combustibility test in " national fire-proof construction material Quality Supervision and Inspection Center " (Chengdu) in November, 2011, testing result consistent with theoretical experimental result (oxygen index (OI) of material, between 31-33, is all nonflammable material); Resistance to 40% sulfuric acid corrosion and ultra-violet resistance can be good.
(6) a constructing technology scheme mature and reliable for FRP of the present invention smoke evacuation cylinder connection segment node.
(7) the construction costs of FRP smoke evacuation cylinder 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, having obtained the experience of abundant maturation aspect the making of FRP smoke evacuation cylinder and installation, can guarantee high-quality and safe construction in practice completely.
Accompanying drawing explanation
The Tu1Wei thermal power plant of the present invention chimney structure schematic diagram that wets
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
Till Fig. 5, shake dot structure schematic diagram
Fig. 6 is connection segment joint design schematic diagram
The specific embodiment
In accompanying drawing, each parts label 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 shakes point 60, only shakes platform 61, only shake support 62, cantilever connector 63, the outstanding cantilever 64 that only shakes, the arm that only shakes support 65, hard polyurethane ester material 70.
The present invention is the wet chimney of a kind of thermal power plant of fire retardant, anticorrosive glass fibre reinforced plastic structure, consists of: outer support mechanism 10 and frp lining 20 in structure two parts.Frp lining 20 is multistage glass fibre reinforced plastic cylinder by sectional making whole inner cores through being tightly connected, on frp lining 20, at interval of a segment distance, one circle reinforcing rib 30 is set, and at interval of a segment distance, a non-metal expansion joint 40 is set, at the differing heights of wet chimney, is respectively arranged with support node 50.
Outer support mechanism 10 can be steel concrete urceolus or supporting frame with steel structure.
For the wet chimney in the steam power station that highly reaches 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 a plurality of support nodes at the differing heights of chimney, support node 50 structures are, the liner bracket 51 that is provided with evagination at frp lining 20, liner bracket 51 is arranged with steel perimeter beam 52, and liner bracket 51 inner fillings have hard polyurethane ester material 70; Outer support mechanism 10 connects a bearing platform 55, and ring beam support 54 is installed on bearing platform 55, and prefabricated bracket 53 is installed on ring beam support 54, and prefabricated bracket 53 front ends support steel perimeter beam 52.
The structure of non-metal expansion joint 40 is between two sections of frp linings 20, to connect the flexible joint of the corrosion-and high-temp-resistant of a W shape.
The structure of reinforcing rib 30 is that at frp lining 20 outer walls, one cross section being set is outer convex or trapezoidal muscle circle, in the space that muscle circle surrounds, is filled with hard polyurethane ester material 70; Spacing L≤1.5D between two adjacent reinforcing ribs 30, wherein D is the internal diameter of frp lining 20.
Differing heights at wet chimney is also respectively arranged with only rolling point 60, only the structure of rolling point 60 is, outer support mechanism 10 connects one and only shakes platform 61, only shake to be provided with successively on platform 61 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 ends, the outer wall of frp lining 20 is pressed close in the arm that only shakes support 65, prevents that frp lining 20 from rocking.
Wet chimney is segmentation self-support structure, each several part structure proportion is that wet chimney top absolute altitude 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 inside diameter D=7m, barrel thickness t=19mm, sectional making, every section of 5-7m, lifting splicing successively, joint is wet technique, the spacing L=5m between adjacent two reinforcing ribs 30 of sticking with paste.
Below the description of Related Art that the present invention designs:
(1) main technical standards and associated documents
ASTM D5364 – 93(2008), the design of coal-burning power plant's glass fiber reinforced plastics chimney lining,
Manufacture and installation code.
GB/T 1446-2005 the generals of test methods for properties of fiberreinforced plastics
GB/T 1447-2005 Test method for tensile properties of glass fiberreinforced plastics
GB/T 1448-2005 Test method for compressive properties of glass fiberreinforced plastics
Soluble part of content test method of GB/T 2576-2005 fiber reinforced plastic resin
GB/T 2577-2005 Test method for resin content of glass fiber reinforced plastics
GB/T 3854-2005 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/T 8237-2005 glass fiber reinforced plastics liquid unsaturated polyester resin
HG 20696-1999 glass fiber reinforced plastic equipment design code
(2) about the structure design of fibreglass epoxy stove-pipe,
1, design condition
According to chimney ASTM D5364-93, design.
Fibreglass epoxy stove-pipe structural analysis and computation adopts finite element analysis software ANSYS to carry out, and with three-dimensional entity model, describes all chimney shell structure and braced structures.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 member, 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 2.75～22.2 scope.
2, design parameters
A FRP of the present invention smoke evacuation cylinder top absolute altitude 210m ,+65m ,+115m ,+165m etc. locate to be provided with fixed support node, and 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 evacuation cylinder is divided into 34m, 50m, 50m, tetra-sections of calculating of 45m.FRP chimney lining internal diameter 7000mm, requires through the thick t=19mm(deck of computational analysis barrel minimum thickness: 10mm), reinforcing rib spacing is in L=5000mm.Below calculate segmentation self-support structure scheme.
| Safety classes of structure | One-level |
| Wind velocity pressure | 0.45kN/m 2(by 100 years one, meet 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 the extreme lowest temperature | -21.0℃ |
3, determining 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 are calculated:
FRP liner density 2243kg/m
3(comprise and strengthen circle and annex), wet gray density 1281kg/m
3the axial compression stress being caused by static load:
4.2 wind loads:
When calculating FRP liner, this does not consider the effect of wind load.
4.3 seismic bending moments are calculated:
Seismic fortification intensity: 8 degree; Basic seismic design acceleration: 0.20g
Classification of design earthquake: first group
Project site classification: II; Environment category: two (b)
Fiber glass reinforced plastic chimney height of lift is 35-50m, need to consider the impact of the high vibration shape.This calculates the effect of the inertia force of only considering inner core.The main impact of considering first three vibration shape, by the result of calculation estimation earthquake bending 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 ℃, 90 ℃ of flue gas normal temperatures, are 121 ℃ extremely.Calculate FRP liner internal-external temperature difference Tw: Δ Tw=1 ℃.Consider special circumstances, get FRP liner internal-external temperature difference Tw=40 ℃.
α
zfor the axial thermal expansion coefficient of FRP liner, α
z=27 * 10
-61/ ℃
α
θfor the hoop coefficient of thermal expansion of FRP liner, α
θ=9 * 10
-61/ ℃
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:
Axial: long-term
Short-term
Hoop: long-term
Short-term
4.5 external pressures:
By 90 ℃ of average flue-gas temperatures, because external pressure acts on the hoop compressive stress that FRP cylindrical shell produces: 0.189MPa. is due to the effect of expansion joint, FRP liner, because the thermal walking that the temperature difference of condition of work and mounting condition causes is absorbed, does not produce thermal stress at FRP liner.
5, the strength check of unfavorable Load Combination operating mode
5.1 axial compressive stress:
The long-term permissible value 12.3MPa of long duration load combination (1): 3.063MPa<, OK
Short-term Load Combination (2): 4.037MPa< short-term permissible value 14.1MPa, OK
5.2 hoop compressive stresses:
The long-term permissible value 0.67MPa of long duration load combination (3): 0.206Mpa<, OK
5.3 buckling stress
Load Combination (4): 5.9MPa<182MPa, the thermal force that the OK(FRP liner inside and outside wall temperature difference causes):
Safety factor proof under 5.4 load combinations operating modes:
Axially, hoop is compression, check result of calculation:
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 * 109Pa,
(EI)
s=6.02 * 10
5>=3.64 * 10
5nm
2meet the demands.
7, the vibration of Stiffened Cylindrical Shells Under External Pressure body structure checking computations:
In the reinforcing line with annular ribs, 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 ℃
Axial Thermal distortion: △ 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; The stress of hoop tensile stress, hoop compressive stress, hoop strain maximum, reinforcing rib is 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%
Axially maximum crushing stress is 7.26Mpa
Axially 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 is mainly caused by 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.At chimney, bear maximum dust stratification load, and with the coefficient situation of other loads under, this chimney and supported design thereof meet intensity and stability requirement.
10, the thick optimum results comparison of glass fiber reinforced plastic smoke evacuation barrel
The thick several situation result of calculations for 14mm, 16mm, 18mm, 19mm of smoke evacuation barrel are compared: under unfavorable load combinations operating mode, carry out the check of barrel Strength Safety, because axial, hoop are compression, by following formula, check:
Result of calculation sees the following form:
Rule of thumb, at short term load, be that under wind load and seismic (seismal effect, urceolus has more intense effect to inner core.The numerical value of not considering urceolus impact K in combination is checked should be not excessive, for guaranteeing safe wish degree, gets 19mm.Can accomplish that fibreglass epoxy stove-pipe structure is safe and reliable aspect intensity, integral body and local stability completely.
(3) temperature tolerance of fibreglass epoxy stove-pipe
According to the actual conditions of engineering and the practical experience of engineering in the past, chimney design pressure consideration ± 500Pa.Wet chimney is considered cigarette temperature-40 ℃～65 ℃ in the situation down smoke-discharging barrel structure design of not establishing bypass; In the situation down smoke-discharging barrel structure design of establishing bypass, consider cigarette temperature-40 ℃～130 ℃.From national environmental protection department, stipulate that strict control of coal-fired power plant arranges bypass at present, wet chimney is more suitable for adopting fibreglass epoxy stove-pipe.From material select, to reduce construction investment aspect more favourable.
The applicable temperature range of ASTM standard be normal operating temperature not higher than 93 ℃, abnormal high temperature is higher than 121 ℃ in short-term.To the highest design temperature of the good vinyl esters unsaturated polyester (UP) of heat resistance glass steel, it is 120 ℃.In 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 solidifying is 150 ℃, and the HDT of DERAKANE470HT-400 can reach 180 ℃.Due to the variability of FRP material property, each engineering only just has definite parameter after moulding.
This engineering selected materials is E-CR fiber+DERAKANE MOMENTUM510C-350c resin, 80 ℃ of hot strengths, 10% left and right of decaying.120 ℃ 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, by rational laying, construct and structure design, the reduction of FRP long-term behaviour is with reference to the test data of the standards such as BS4994, ASTM D5364 and producer, and be 25 years the application life that the reduction coefficient that FRP performance decays in time can calculate FRP chimney.
(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 chimney anticorrosion engineering adopts at present sizing material, coating all have problems.The problem that has field control, also has resin Material Selection, and these are all soluble.
Home and abroad theory and practice is for many years studied and is shown, oxygen index (OI) characterizes and belongs to the flammability test in combustion test, and oxygen index (OI) is the important indicator of glass-reinforced plastic material combustibility.Oxygen index (OI) refers under rated condition, and solid material, in oxygen, nitrogen mixed gas stream, maintains the required minimum oxygen content of smooth combustion.
Oxygen index (OI) is high represents that material is nonflammable, and the low expression material of oxygen index (OI) easily burns.The oxygen index (OI) of material (LOI) 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 has formed CNS, and this standard and developed country's oxygen index (OI) testing standard are equal to.
(1) CNS: GB/T8924-2005.Fibre reinforced plastics combustibility test method oxygen index method.
(2) U.S. material development test association criterion: ASTM D2863-06a, Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index).
(3) CNS: GB/T8624-2006, constructional materials and goods classification system for fire performance.
The fiber that this engineering is selected and resin are a kind of good fire-retardant bodies, carried out FRP combustibility test in " national fire-proof construction material Quality Supervision and Inspection Center " (Chengdu) in November, 2011, testing result consistent with theoretical experimental result (oxygen index (OI) of material, between 31-33, is all nonflammable material); Resistance to 40% sulfuric acid corrosion and ultra-violet resistance can be good.
(6) connection of FRP smoke evacuation cylinder segmented node
FRP smoke evacuation cylinder sectional making, every section of 5-7m, every section of lifting splicing successively, joint is the wet technique of sticking with paste.
The making of docking port is most important, and docking port must carry out inside and outside reinforcement with assurance bulk strength.Docking port is made should possess with flue cylindrical shell and is made identical environment temperature, humidity etc., and docking port carries out port processing, 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 water, other spots of wet goods.Should operate in strict accordance with technique, otherwise may cause the structural strength of integral product not enough.For cigarette tower, unified the Flue duct design of engineering.In the situation that quality managemant puts in place, this connected mode is feasible and reliable.
Socket interface adopts dock, and the material that outside adopts is the short felt+glass fabric of cutting, 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 of appraising and deciding as calculated interface meets stretching, compression requirement for bearing capacity.
The interlaminar shear strength of interface adopts the shear strength of resin, is about 10MPa(generally more than 10MPa).The reduction coefficient of socket interface interface laying intensity 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) calculate and need 312mm to be less than design interface width 350mm, meet the demands.
Claims (8)
1. the wet chimney of the thermal power plant of a fire retardant, anticorrosive glass fibre reinforced plastic structure, comprise outer support mechanism (10) and frp lining (20), it is characterized in that: frp lining (20) is multistage glass fibre reinforced plastic cylinder by a sectional making whole inner core through being tightly connected, at frp lining (20), above at interval of a segment distance, one circle reinforcing rib (30) is set, and at interval of a segment distance, a non-metal expansion joint (40) is set, at the differing heights of wet chimney, is respectively arranged with support node (50).
2. the wet chimney of the thermal power plant of fire retardant, anticorrosive glass fibre reinforced plastic structure according to claim 1, it is characterized in that: described support node (50) structure is, at frp lining (20), be provided with the liner bracket (51) of evagination, liner bracket (51) is arranged with steel perimeter beam (52), and liner bracket (51) inner filling has hard polyurethane ester material (70); Outer support mechanism (10) connects a bearing platform (55), and ring beam support (54) is installed on bearing platform (55), and prefabricated bracket (53) is installed on ring beam support (54), and prefabricated bracket (53) front end supports steel perimeter beam (52).
3. the wet chimney of the thermal power plant 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), to connect the flexible joint of the corrosion-and high-temp-resistant of a W shape.
4. the wet chimney of the thermal power plant 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, at frp lining (20) outer wall, one cross section being set is outer convex or trapezoidal muscle circle, in the space that muscle circle surrounds, is filled with hard polyurethane ester material (70); Spacing L≤1.5D between two adjacent reinforcing ribs (30), wherein D is the internal diameter of frp lining (20).
5. the wet chimney of the thermal power plant of fire retardant, anticorrosive glass fibre reinforced plastic structure according to claim 1, it is characterized in that: at the differing heights of wet chimney, be also respectively arranged with 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 to be provided with successively on platform (61) and only shake support (62), cantilever connector (63), cantilever connector (63) connects and only to shake 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 the arm that only shakes support (65), prevent that frp lining (20) from rocking.
6. according to the wet chimney of the thermal power plant of the fire retardant, anticorrosive glass fibre reinforced plastic structure described in claim 1,2 or 5, it is characterized in that: described outer support mechanism (10) is steel concrete urceolus or supporting frame with steel structure.
7. the wet chimney of the thermal power plant of the fire retardant, anticorrosive glass fibre reinforced plastic structure described in one of them according to claim 1-5, it is characterized in that: described wet chimney is segmentation self-support structure, each several part structure proportion is, wet chimney top absolute altitude 210m, at 65m, 115m, 165m place arranges support node (50), at each support node (50) upper end configuration non-metal expansion joint (40), frp lining (20) inside diameter D=7m, barrel thickness t=19mm, sectional making, every section of 5-7m, lifting splicing successively, joint is the wet technique of sticking with paste, spacing L=5m between adjacent two reinforcing ribs (30).
8. the wet chimney of the thermal power plant of fire retardant, anticorrosive glass fibre reinforced plastic structure according to claim 6, it is characterized in that: described wet chimney is segmentation self-support structure, each several part structure proportion is, wet chimney top absolute altitude 210m, at 65m, 115m, 165m place, support node (50) is set, at each support node (50) upper end configuration non-metal expansion joint (40), frp lining (20) inside diameter D=7m, barrel thickness t=19mm, sectional making, every section of 5-7m, lifting splicing successively, joint is wet technique, the spacing L=5m between adjacent two reinforcing ribs (30) of sticking with paste.
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| CN201410131582.7A CN103924819B (en) | 2014-04-03 | 2014-04-03 | A kind of thermal power plant's Wet chimney of fire retardant, anticorrosive glass fibre reinforced plastic structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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| CN103924819B (en) | 2016-03-30 |
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Effective date of registration: 20160809 Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: BEIJING DATANG HENGTONG MECHANICAL TRANSPORT Co.,Ltd. Address before: 100097 5, building 1, Hope Garden, Shuguang garden, Shuguang garden, Beijing, Haidian District 1502 Patentee before: Li Zhichun Patentee before: Wang Kongwei |
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