CN205332248U - Corrosion control system behind single chimney wet flue gas desulfurization of reinforced concrete - Google Patents

Abstract

The utility model discloses a corrosion control system behind single chimney wet flue gas desulfurization of reinforced concrete. The outside -in of this system includes chimney shaft reinforced concrete wall layer (1), thermal insulating layer (2) and acid brick inner liner (3) in proper order, and the coating is in fast dry sand thick liquid on the inner wall of acid brick inner liner (3) is restoreed layer (4), is coated and is in under coat (5), coating that fast dry sand thick liquid was restoreed on (4) the inner wall of layer are in corrosion -preventing glue adhesion agent layer (6) and coating on under coat (5) inner wall are in the anticorrosive vitrified tile of light (7) on the inner wall of corrosion -preventing glue adhesion agent layer (6). The utility model discloses a chimney corrosion control system has strengthened antagonism hydrofluoric acid corrosion behavior, and the at present internal chimney anti -corrosion material of the same kind of effective improvement is not able to bear or endure the shortcoming that hydrofluoric acid corrodes, and the price is less than external like product. Simultaneously, the elasticity on this corrosion -preventing glue adhesion agent layer produces deformation along with the change of temperature to avoid appearing the destruction that stress caused to corrosion control system.

Description

Corrosion protection system after reinforced concrete single-tube chimney wet desulphurization

Technical field

This utility model relates to chimney anticorrosion field, particularly to the corrosion protection system after a kind of reinforced concrete single-tube chimney wet desulphurization。

Background technology

China's early stage chimney of electric plant structure is monotubular reinforced concrete chimney, general monotubular reinforced concrete chimney conventional design method is: acid proof lining and waterglass expanded pearlite rock beam thermal insulation layer that acid resistant adhesive mortar is built by laying bricks or stones are close to armored concrete barrel, and the annular cantilever support that segmentation is stretched out by armored concrete barrel, concrete inner surface does preservative treatment。The structural integrity of this structural shape chimney lining and heat-insulation layer is relatively poor, and flue gas is easier to penetrate into the inner surface of barrel from the gap of these brick settings and heat insulating block, and therefore chimney needs periodic maintenance。

In recent years, China's power construction is developed rapidly, stepping up and the lifting of energy-conserving and environment-protective dynamics of national environmental standard, domestic all requiring to carry out chimney desulfurization process to newly-built power-plant engineering and original power plant, power-plant flue gas wet desulfurization system becomes the Key Environmental Protection field of National strategic planning。Therefore, the transformation and upgrade of original system are also extremely urgent。

At present, find out from the desulfuration chimney anticorrosion condition survey of investigation power plant, single-cylinder type reinforced concrete chimney proportion has reached about 60%, therefore some chimneys of present stage particularly old chimney design is not designed according to the requirement of wet flue gas discharge, and chimney acidproof brick inner liner and heat insulation layer are caused burn into destroy by wet flue gas。Therefore, how existing inner lining structure be disclosure satisfy that the old chimney of structural safety and service requirement and some newly-built chimneys carry out inside lining anti-corrosive and process the current problem demanding prompt solution of establishment。

Currently, the domestic generally individually employing of some power plant " adhesive+heat insulating brick " system is as the Corrosion prevention scheme of Wet chimney。Also designer is had to add different coating therein, but the problem that there is intensity heat insulation effect weak, moistureproof poor, acidproof (mainly Fluohydric acid. HF) corrosivity difference and not temp. variation resistant all in various degree。

Utility model content

Technical problem to be solved in the utility model is to provide the corrosion protection system after a kind of reinforced concrete chimney wet desulphurization, which overcomes the drawbacks described above of prior art。

Technical problem to be solved in the utility model is achieved through the following technical solutions:

A kind of corrosion protection system after reinforced concrete single-tube chimney wet desulphurization; ecto-entad includes chimney shaft reinforced concrete parietal layer, heat insulation layer and acidproof brick inner liner successively, the priming coat, the dope adhesive layer being coated on described priming coat inwall that be coated in the fast dry mortar repair layer on the inwall of described acidproof brick inner liner, are coated on described fast dry mortar repair layer inwall and be coated in the lightweight anticorrosion vitrified tile on described dope adhesive layer inwall。

Preferably, in technique scheme, described priming coat is with epoxy resin modified organosilicon resin for film forming binder, adds the bi-component Heat and corrosion resistant coating layer of heat-resisting color stuffing, additive processing preparation。

Preferably, in technique scheme, described dope adhesive layer is asphalt modification polyurethane adhesive layer。

Preferably, in technique scheme, described lightweight anticorrosion vitrified tile be with mineral be raw material foamed glass brick or Ceramic Tiles。

Preferably, in technique scheme, the thickness of described fast dry mortar repair layer is 2-3mm。

Preferably, in technique scheme, the thickness >=0.1mm of described priming coat。

Preferably, in technique scheme, the coating method of described priming coat is roller coating。

This utility model technique scheme, has the advantages that

Compared with prior art, chimney anticorrosion system of the present utility model, happy haze special anti-corrosion adhesive is utilized the priming coat and brick layer that are coated on inner wall of stack to be bonded together, it is effectively prevented in desulphurization system acid and the flue gas corrosion to chimney, especially antagonism Fluohydric acid. corrosive nature is strengthened, the shortcoming being effectively improved current domestic similar chimney anticorrosion material not hydrofluoric acid corrosion resistance, and price is lower than same kind of products at abroad。Meanwhile, the elastic variation with temperature of this dope adhesive layer and produce deformation, thus avoiding the occurrence of the destruction that corrosion protection system is caused by stress。

Accompanying drawing explanation

Fig. 1 is the chimney structure schematic diagram before anticorrosion。

Fig. 2 is funnel body anticorrosive coat floor map of the present utility model。

Fig. 3 is funnel body anticorrosive coat section plan of the present utility model。

Wherein, 1-chimney shaft reinforced concrete parietal layer, 2-heat insulation layer, 3-acidproof brick inner liner, the fast dry mortar repair layer of 4-, 5-priming coat, 6-dope adhesive layer, 7-lightweight anticorrosion vitrified tile。

Detailed description of the invention

Below detailed description of the invention of the present utility model is described in detail, in order to be further appreciated by this utility model。

Fig. 1 is the chimney structure schematic diagram before anticorrosion。As it can be seen, chimney is generally followed successively by from outside to inside: chimney shaft reinforced concrete parietal layer 1, heat insulation layer 2 and acidproof brick inner liner 3。Fig. 2 is funnel body anticorrosive coat floor map of the present utility model。As in figure 2 it is shown, this utility model increases fast dry mortar repair layer 4, priming coat 5, dope adhesive layer 6 and lightweight anticorrosion vitrified tile 7 on the basis of Fig. 1 chimney。Specifically, chimney of the present utility model is followed successively by from outside to inside: chimney shaft reinforced concrete parietal layer 1, heat insulation layer 2, acidproof brick inner liner 3, fast dry mortar repair layer 4, priming coat 5, dope adhesive layer 6 and lightweight anticorrosion vitrified tile 7。

Priming coat 5 is the special primary coat of happy haze that Beijing Kai Lan Yifang Technology Co., Ltd. produces。This priming coat 5, with epoxy resin modified organosilicon resin for film forming binder, adds heat-resisting color stuffing, specialist additive etc., through the bi-component Heat and corrosion resistant coating that advanced technologies is prepared from。This material has antiacid, alkali resistant, the temperature resistance of excellence and becomes and closed performance, superpower adhesive property, it is adaptable to the confining bed of the anti-corrosion material of facility and base material under the special environment of coal-burning power plant。

Dope adhesive layer 6 is the happy haze dope stick that Beijing Kai Lan Yifang Technology Co., Ltd. produces。Dope stick 6 is the asphalt modification polyurethane adhesive that Wet chimney anticorrosion is special。It plays the antisepsis of key in corrosion protection system, and acid resistance is good, the corrosion of certain density acid solution can be resisted, and this kind of material can produce certain self-healing ability after multiple mixed acid solution environment produces initial destruction, the intensity making loss is made up, thus extending this kind of material service life under acid corrosion environment；The corrosion of certain density Fluohydric acid. (HF) can be resisted；There is relatively low vapor pervious rate, chimney is in operation under positive pressure state when properly functioning, although pressure is little, but the corrosiveness of chimney is affected very big by it, flue gas and acid solution can be made through liner tile and acidproof adhesive film, and this feature requires glued membrane it is necessary to have low water vapor transmittance。

The antiseptic property of above-mentioned dope stick 6 is better than domestic adhesive, and the external product that price is suitable lower than performance, Adhensive performance is compared as follows shown in table 1:

Table 1

Table 2

Dope stick soak test result in mixed acid of the present utility model

By table 1 and table 2 it can be seen that domestic organic silica gel lengthen in time in experimentation fall slag gradually, thinning, when 10 days, hot strength has decayed to the 20% of ortho states, presents broken shape after 20 days, it is impossible to test。

Bin Gaode batten soaked through 50 days, and color becomes brown from black, batten becomes, and hard resilience is slack-off, and elongation at break declines to some extent, although hot strength still has 0.4MPa, but spline local has produced perfoliate hole。

Dope stick 6 decay resistance is significantly better than domestic organic silica gel, and soaked color through 50 days unchanged, smooth surface, intact, keeps the hot strength also higher than Bin Gaode glue；Known through Integrated comparative: domestic organic silicon adhesive is not corrosion-resistant, this adhesive decay resistance is better than Bin Gaode glue。

Lightweight anticorrosion vitrified tile 7 is the happy haze lightweight anticorrosion vitrified tile that Beijing Kai Lan Yifang Technology Co., Ltd. produces。It is with mineral for raw material, add appropriate, a large amount of gas can be produced at a certain temperature, there is the mixture of the host mineral of expansion character, pass through optimization of C/C composites, adjust acid number coefficient, grain composition, take reasonably mixing, molding, method for cooking, Optimizing Process Parameters, raw material is made to produce the glassy phase that viscosity is bigger under the effect of inorganic compounding mineralizer, the a large amount of gases released with host mineral form the bubble of remaining silent uniformly gathered, by cooling down, processing, make bulk density little, heat conductivity is low, good heat-insulation effect, volume water absorption rate is low, anti-freezing property is excellent, the features such as water proof anti-seepage ability is strong, it it is the high-performance light vitreous Ceramic Tiles that can use for a long time in adverse circumstances。

The old chimney of prior art, it is not designed by wet flue gas emission request during design, chimney acidproof brick inner liner 3 and heat insulation layer 2 are caused burn into destroy by wet flue gas, before anticorrosion, chimney is carried out structure detection, for disclosure satisfy that chimney runs safe acidproof brick inner liner 3 surface and carries out facility polishing, cleaning。

Irregular out-of-flatness position after acidproof brick inner liner 3 surface finish, cleaning is repaired with fast dry mortar 4, it is ensured that substrate is smooth, it is to avoid follow-up primary coat brushing vitrified tile that is uneven and that cause because of substrate out-of-flatness pastes not plane, the overall antiseptic effect of impact。Fast dry mortar semi-finals degree grade >=C40, meets foundation base intension requirement；Rate of drying is fast, does not produce crack after hardening, has better cracking resistance impervious。

The application, based on above-mentioned existing old chimney, proposes the manufacture method of the corrosion protection system after a kind of reinforced concrete single-tube chimney wet desulphurization on this basis, comprises the following steps:

(1), chimney acidproof brick inner liner 3 surface is carried out facility polishing, cleaning；

(2), chimney acidproof brick inner liner 3 surface imperfection out-of-flatness position being repaired with fast dry mortar, depth of plastering is 2-3mm, it is ensured that substrate is smooth, forms fast dry mortar repair layer 4；

(3), substrate cleaning, repair qualified after, inner wall of stack is carried out happy haze special bottom be coated with construction, coating thickness >=0.1mm, formed priming coat 5。This primary coat construction adopts roll coating process, to obtain good painting effect。The order of roller coating from top to bottom, from left to right, should disorderly not apply, it is to avoid cause holiday or brush blocked up, brush unequal。

(4), dope stick is stirred, scrape a layer thickness in the special primed surface painting of happy haze and be about the dope stick of about 1-2mm as primer, be coated with and scrape uniform full no sag。

(5), pasting happy haze lightweight anticorrosion vitrified tile 7, the topcoating to be contacted of Ceramic Tiles carrying out installing is smeared one layer of happy haze dope stick, THICKNESS CONTROL is at about 1-2mm, and glue-line gross thickness is about 2-4mm。Between brickwork joint, adhesive is full closely knit, leaves no gaps。Between brick and brick, circumferential weld is connection seam, and longitudinal joint answers the fissure of displacement to arrange。Fissure of displacement width is 1/2 that brick is wide, minimum cannot be less than 1/3。

Chimney anticorrosion system of the present utility model carries out anticorrosive construction when ensureing chimney structure safety, by the adhesive in corrosion protection system is optimized, (happy haze adhesive strengthens antagonism Fluohydric acid. corrosive nature, happy haze anticorrosion adhesive stretch variation with temperature and produce deformation), thus avoiding the occurrence of the destruction that corrosion protection system is caused by stress。The shortcoming being effectively improved current domestic similar chimney anticorrosion material not hydrofluoric acid corrosion resistance, and price is lower than same kind of products at abroad。

Although this utility model is with embodiment openly as above; so it is not intended to limit this utility model; any those skilled in the art; without departing from spirit and scope of the present utility model; all can doing various different selection and amendment, therefore protection domain of the present utility model is limited by claims and equivalents thereof。

Claims (6)

1. the corrosion protection system after a reinforced concrete single-tube chimney wet desulphurization, ecto-entad includes chimney shaft reinforced concrete parietal layer (1) successively, heat insulation layer (2) and acidproof brick inner liner (3), it is characterized in that, described corrosion protection system also includes: be coated in the fast dry mortar repair layer (4) on the inwall of described acidproof brick inner liner (3), it is coated in the priming coat (5) on described fast dry mortar repair layer (4) inwall, it is coated in the dope adhesive layer (6) on described priming coat (5) inwall and is coated in lightweight anticorrosion vitrified tile (7) on described dope adhesive layer (6) inwall。

2. the corrosion protection system after reinforced concrete single-tube chimney wet desulphurization according to claim 1, it is characterised in that described dope adhesive layer (6) is asphalt modification polyurethane adhesive layer。

3. the corrosion protection system after reinforced concrete single-tube chimney wet desulphurization according to claim 1, it is characterised in that described lightweight anticorrosion vitrified tile (7) be with mineral be raw material foamed glass brick or Ceramic Tiles。

4. the corrosion protection system after reinforced concrete single-tube chimney wet desulphurization according to claim 1, it is characterised in that the thickness of described fast dry mortar repair layer (4) is 2-3mm。

5. the corrosion protection system after reinforced concrete single-tube chimney wet desulphurization according to claim 1, it is characterised in that the thickness >=0.1mm of described priming coat (5)。

6. the corrosion protection system after reinforced concrete single-tube chimney wet desulphurization according to claim 1, it is characterised in that the coating method of described priming coat (5) is roller coating。