CN201251194Y

CN201251194Y - Combined sealing device of boiler roof of a generating plant

Info

Publication number: CN201251194Y
Application number: CNU2008201346399U
Authority: CN
Inventors: 郝葵
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-09-04
Filing date: 2008-09-04
Publication date: 2009-06-03
Anticipated expiration: 2018-09-04
Also published as: DE202008013793U1

Abstract

The utility model relates to a combined sealing device of boiler roof of a generating plant, in particular to a combined sealing device of coal burning boiler roof of a generating plant, which is formed by a roof steel plate and a ceramic fiber sealing layer on the roof steel plate. The ceramic fiber sealing layer is formed by three ceramic fiber layers, high-temperature adhesive between every two ceramic fiber layers and steel meshes laying on the three ceramic fiber layers; a plastic refractory lower layer and a plastic refractory upper layer are sequentially arranged on the gap of the roof steel plate, and a thin plastic partition board is arranged between the plastic refractory lower layer and the plastic refractory upper layer; and the top surface of the topside ceramic fiber layer is cohered with a layer of metal film. The crack of a sealing layer can be reduced, at the same time, the channel of the crack of the sealing layer is extended, and the damp of flue gas is increased so as to decrease the flow speed of the flue gas, and the favorable sealing effect is achieved; in addition, the utility model can also prevent the ceramic fiber layers from being shelled off and damaged.

Description

Station boiler top combination sealing arrangement

Technical field

The utility model relates to a kind of station boiler top combination sealing arrangement, refers in particular to the combination sealing arrangement of station boiler furnace roof.

Background technology

As everyone knows, it is the ubiquitous problem of station boiler that the boiler furnace roof leaks out, leaks ash, prior art normally occurs than after slit or crack place carries out repair welding greatly at the furnace roof steel plate, pour into a mould (filling) one deck fire-resistant plastic bed of material (as: asbestos exotic material) again and form sealant, inhomogeneous at boiler furnace roof pipeline expanded by heating, can make the slit or the crack size of furnace roof inhomogeneous, often cause the fire-resistant plastic bed of material crack to occur, still have high-temperature flue gas and directly rush out and cause the smoke spillage phenomenon because the swell increment of plastic refractory is not enough.

In the last few years, fill out and establish the bigger ceramic fiber layer of swell increment at the furnace roof steel plate slit of some station boiler or place, crack, this sealant can absorb the expansion in boiler furnace roof slit preferably, promptly can reduce the appearance in crack, make the boiler air leak rate of air curtain that very big decline be arranged, still, because the furnace roof gap size is widely different in hot environment, the ceramic fibre material performance also is difficult to the stable elasticity of maintenance in the hot environment again, and therefore, itself still there are some slits in this ceramic fibre sealant.

Summary of the invention

The purpose of this utility model is to improve existing fire-resistant plastic bed of material sealing or ceramic fiber layer sealing, and a kind of station boiler top combination sealing arrangement is proposed, be divided into the fire-resistant plastic bed of material sealing of limited thickness two-layer, prolong slit passage in the fire-resistant plastic layer, increase the damping of flue gas, increase vapor-proof etch layer at existing ceramic fiber layer sealing end face again, at high temperature the ceramic fiber layer performance is more stable to keep.

The technical solution of the utility model: a kind of station boiler top combination sealing arrangement, by a furnace roof steel plate and on the ceramic fibre sealant constitute, this ceramic fibre sealant is by three layers of ceramic fiber layer, high temperature binder between every two-layer ceramic fibrage and be laid on three layers of steel mesh above the ceramic fiber layer and constitute, one deck plastic refractory lower floor and one deck plastic refractory upper strata are set on the slit of furnace roof steel plate in regular turn, between plastic refractory upper strata and plastic refractory lower floor, every putting a thin plastic septum, and cohere layer of metal film at the ceramic fiber layer end face of the superiors.

Described plastic refractory lower floor compartment of terrain laterally is embedded with many spiral reinforcements.

The utility model has also prolonged the passage in plastic refractory sealant crack when reducing the crack of sealant, increase the damping of flue gas, and flue gas flow rate is lowered, and plays good sealing effectiveness, can avoid ceramic fiber layer to be fallen by Stripping in addition and is damaged.

Description of drawings

Fig. 1 is the schematic diagram of the utility model exemplary embodiments;

Fig. 2 is the A-A generalized section of Fig. 1.

The specific embodiment

In conjunction with the accompanying drawings the utility model is further specified with following exemplary embodiments:

Present embodiment is by a furnace roof steel plate 1, one deck plastic refractory upper strata 2, one deck plastic refractory lower floor 3, a thin plastic septum 4 and a ceramic fibre sealant 5, as shown in Figure 1, and wherein:

A furnace roof steel plate 1 is the sealing steel plate that is welded on the boiler furnace roof, there are a lot of wall pipes to pass on it, leave slit 11 between the through hole on wall pipe and the furnace roof steel plate 1, the high-temperature flue gas that boiler internal is being carried cigarette ash secretly constantly passes slit 11 to external diffusion, belongs to prior art;

One deck plastic refractory upper strata 2 and one deck plastic refractory lower floor 3 are that the fire-resistant plastic bed of material by a limited thickness is separated (because relative other encapsulant proportion of moldable proportion is bigger, usually examine tired from the angle of furnace roof bearing capacity, limit about 100 millimeters of its thickness), between plastic refractory upper strata 2 and plastic refractory lower floor 3 every putting (cast) thin plastic septum 4, when hot operation, plastic septum 4 meeting thawings be should approach and two-layer independently plastic refractory upper strata 2 and plastic refractory lower floor 3 formed, each will the crack occur at diverse location in the high temperature expansion, thereby, the flue gas that leaks from the slit 11 of furnace roof steel plate 1 can pass the crack that forms the plastic refractory lower floor 3, slit between plastic refractory upper strata 2 and one deck plastic refractory lower floor 3, pass the crack that forms in the plastic refractory upper strata 2 again, prolonged slit passage in the fire-resistant plastic layer, increase the damping of flue gas, flue gas flow rate is lowered, play good sealing effectiveness, result according to our test of many times: pass of the flow velocity reduction by 50% of the flue gas of one deck plastic refractory upper strata 2 and one deck plastic refractory lower floor 3 than the flue gas of one deck fire-resistant plastic bed of material that passes 100 millimeters thick, if the fire-resistant plastic bed of material of about 100 millimeters thick is separated into three layers, every layer thickness is thin to the greatest extent, and plastic layer intensity is too poor again.In addition, this plastic refractory lower floor 3 abuts in above the furnace roof steel plate 1, and it is interior and compartment of terrain laterally is embedded with many spiral reinforcements 31, as shown in Figure 2, reaches 20% with the hot strength that strengthens this plastic refractory lower floor 3.

Ceramic fibre sealant 5 is to be made of high temperature binder 52 between three layers of ceramic fiber layer 51, the every two-layer ceramic fibrage 51 and the steel meshes 53 that are laid on above three layers of ceramic fiber layer 51, this ceramic fibre sealant 5 is to abut in above the plastic refractory upper strata 2, because ceramic fibre material has higher elasticity, toughness, can absorb the expansion in boiler furnace roof slit preferably, belong to prior art; But; under steam etch, sweep of gases environment; ceramic fibre makes moist and is easily washed away Stripping and fall and influence sealing effectiveness; ceramic fiber layer 51 end faces in the superiors cohere layer of metal film 54; as the diaphragm of vapor-proof etch, sweep of gases, thereby, the moisture resistance that ceramic fibre sealant 5 outer surfaces (being the position that needs often maintenance, changes operations such as encapsulant) are subjected to steam strengthened; can prevent the accidental injury in the maintenance process, and strengthen whole tensile strength.

Claims

1, a kind of station boiler top combination sealing arrangement, by a furnace roof steel plate (1) and on ceramic fibre sealant (5) constitute, this ceramic fibre sealant (5) is by three layers of ceramic fiber layer (51), high temperature binder (52) between every two-layer ceramic fibrage (51) and the steel mesh (53) that is laid on above three layers of ceramic fiber layer (51) constitute, it is characterized in that, one deck plastic refractory lower floor (3) and one deck plastic refractory upper strata (2) are set on the slit (11) of furnace roof steel plate (1) in regular turn, between plastic refractory upper strata (2) and plastic refractory lower floor (3), every putting a thin plastic septum (4), and cohere layer of metal film (54) at ceramic fiber layer (51) end face of the superiors.

2, a kind of station boiler top combination sealing arrangement according to claim 1 is characterized in that, described plastic refractory lower floor (3) compartment of terrain laterally is embedded with many spiral reinforcements (31).