CN111927192A

CN111927192A - Anticorrosion construction process for concrete or brick-based chimney

Info

Publication number: CN111927192A
Application number: CN202010511422.0A
Authority: CN
Inventors: 游在鑫; 刘洪忠; 董晓汉; 王建明
Original assignee: Shandong Qingshuo Environmental Science And Technology Co ltd
Current assignee: Shandong Qingshuo Environmental Science And Technology Co ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2020-11-13

Abstract

The invention discloses an anticorrosion construction process of a concrete or brick-based chimney, which comprises the following steps: step 1, polishing a local convex part of a chimney; step 2, repairing the inner wall cavity and the concave part on the surface of the processed base layer; step 3, integrally spraying an interface agent; step 4, coating glass fiber reinforced plastic on the surface of the chimney; and 5, spraying or blade coating the special nano hybrid polymer for corrosion prevention of the chimney on the surface of the glass fiber reinforced plastic. The process firstly coats a layer of glass fiber reinforced plastic on the surface of a brick-based or concrete-based chimney wall base material, and then coats the special nano hybrid polymer for chimney corrosion prevention, thereby solving the problems of bulging and falling of a coating type brick-based or concrete-based chimney corrosion prevention layer.

Description

Anticorrosion construction process for concrete or brick-based chimney

Technical Field

The invention relates to a chimney anticorrosion process which is mainly applied to the field of wet chimney anticorrosion after wet flue gas desulfurization. The process mainly aims at the corrosion prevention of the coating of the concrete-based chimney and the brick-based chimney.

Background

In recent years, with the steady implementation of national environmental protection policies and the enhancement of public environmental awareness, the flue gas desulfurization treatment and operation of domestic power plants and industrial boilers gradually enter normalization and standardization. At present, the domestic adopted desulfurization process is mainly a wet desulfurization process. The flue gas after wet desulphurization is saturated wet flue gas with the temperature of 40-50 ℃, has high humidity and low temperature, and is in a condensation and condensation state. The PH value of the condensation dew liquid of the chimney is about 2.0, and the chimney is designed and treated according to the strong corrosive smoke.

The prior construction process is mainly applied to corrosion prevention of a steel-based chimney, but when the steel-based chimney is applied to a brick-based or concrete-based chimney, the chimney is corroded by wet flue gas for many years, the water content of a substrate is higher, even a part of the substrate is crisp, and a coating type chimney anticorrosive paint is sprayed or blade-coated on the substrate, so that an anticorrosive coating is easy to bulge and fall off in a short time.

Disclosure of Invention

Aiming at the problems, the invention discloses an anticorrosion construction process for a concrete or brick-based chimney, which comprises the steps of firstly coating a layer of glass fiber reinforced plastic on the surface of a brick-based or concrete-based chimney wall substrate, and then coating a special nano hybrid polymer for chimney anticorrosion, so that the problems of bulging and falling of a coating type brick-based or concrete-based chimney anticorrosion layer are solved.

An anticorrosion construction process for a concrete or brick-based chimney comprises the following steps:

step 1, polishing a local convex part of a chimney;

step 2, repairing the inner wall cavity and the concave part on the surface of the processed base layer;

step 3, integrally spraying an interface agent;

step 4, coating glass fiber reinforced plastic on the surface of the chimney;

and 5, spraying or blade coating the special nano hybrid polymer for corrosion prevention of the chimney on the surface of the glass fiber reinforced plastic.

Preferably, the polishing method in the step 1 is as follows: and carrying out sand blasting operation on the inner wall by adopting iron ore sand.

Preferably, the distance between the muzzle and the inner wall of the chimney is 200-300mm during sand blasting, and the angle between the muzzle and the inner wall of the chimney is 15-30 degrees.

Preferably, the inner wall is maintained for 24 hours after the repair in the step 2, and is naturally dried for 7 days.

Preferably, the glass fiber reinforced plastic in the step 4 comprises UFC paint and glass fiber cloth, the UFC paint is firstly coated on the surface of the chimney, then the glass fiber cloth is pasted, and then the UFC paint and the glass fiber cloth are coated, and three layers of glass fiber cloth and four layers of UFC paint are totally coated.

Preferably, the UFC coating is a mixture comprising an initiator and a promoter, and the mixture is stirred uniformly to filter out impurities and large particles.

Preferably, the glass fiber cloth is overlapped by 50mm in the vertical and horizontal gaps.

Preferably, the coating is continuously coated on the surface of the glass fiber cloth in the step 4, and the glass fiber cloth is continuously adhered on the surface of the coating, so that three layers of glass fiber cloth and four layers of coating are formed.

Preferably, the UFC coating is painted in step 4, and physical reinforcement is performed after glass fiber cloth pasting construction.

Preferably, the stainless steel nail with the volume of 5 cm is adopted, 7 fixing points per square meter are adopted, and finally, the exposed part of the nail cap is integrally treated.

Preferably, the thickness of the nano hybrid polymer in the step 5 is more than or equal to 1.5 mm.

The invention has the beneficial effects that:

the surface of the brick base or concrete base chimney wall base material is coated with a layer of glass fiber reinforced plastic, and then coated with the special nano hybrid polymer for chimney corrosion prevention, so that the problems of the coating such as the bulging and the falling of the brick base and the concrete base chimney corrosion prevention layer are solved. Simple process, low investment and good use effect. .

Detailed Description

The technical solutions in the embodiments of the present application are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present invention, it is to be understood that the terms "inner", "outer", "left", "right" and "indicating orientation or positional relationship are based on orientation or positional relationship, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The invention discloses an anticorrosion construction process of a concrete or brick-based chimney, which comprises the following steps:

(1) polishing the local convex part by adopting an electric tool;

integral sand blasting: performing sand blasting treatment on the inner wall of the chimney according to GB8923-88 reaching Sa2.5 grade standard, performing sand blasting operation on the inner wall by using iron ore sand, and cleaning the dust deposit and the corrosion layer on the inner wall of the chimney; the working pressure of the air compressor is 0.6-0.8 Mpa, preferably 0.8Mpa, the distance between the muzzle and the inner wall is about 200-300mm during sand blasting, and the angle is preferably 15-30 degrees.

(2) And (3) repairing the inner wall cavity and the concave part on the surface of the processed base layer by adopting a special repairing material. And after the repairing is finished, the inner wall is maintained for 24 hours, the inner wall is naturally dried for 7 days, and then the interface agent is integrally coated by rolling twice, so that the roller coating is uniform, and has no sagging, omission and air holes.

(3) And preparing the glass fiber reinforced plastic layer.

Manual molding: uniformly stirring the mixture mixed with the initiator and the accelerator and the UFC coating;

and (3) filtering: in order to remove impurities and large particles in the coating, the coating must be filtered;

lining cloth: the construction is carried out according to the product specification strictly, and the materials are fully stirred, evenly stirred and self-cured. And (3) uniformly brushing the prepared UFC coating on the surface of the chimney, wherein the UFC coating is carefully and crossly rolled and coated once to prevent the missed brushing from being uniform, and the cut glass fiber cloth is uniformly adhered after being brushed. When the glass fiber cloth is pasted, the glass fiber cloth is smooth, compacted, free of bubbles and wrinkles and free of strong pulling in construction procedures.

If bubbles exist, the bubbles are treated at any time; the glass fiber cloth is completely soaked by the UFC coating, the upper, lower, left and right gaps of the glass fiber cloth are overlapped by 50mm, the coating is coated on the outer side of the glass fiber cloth, then the glass fiber cloth is continuously pasted and coated with the coating, three layers of glass fiber cloth and four layers of coating are totally coated on the outer wall of the chimney, and the thickness of the glass fiber cloth is about 3 mm.

(4) And (3) physical reinforcement: after the glass fiber reinforced plastic layer is constructed, physical reinforcement is needed, 7 fixed points are needed per square meter by adopting a stainless steel nail of 5 cm, and finally, the exposed part of the nail cap is integrally treated.

(5) The BJSJ chimney corrosion-resistant special nano hybrid polymer is sprayed or blade-coated on the surface of the glass fiber reinforced plastic substrate, the total thickness is more than or equal to 1.5mm, and the complete and uniform coverage is realized.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An anticorrosion construction process for a concrete or brick-based chimney is characterized by comprising the following steps:

step 1, polishing a local convex part of a chimney;

step 3, integrally spraying an interface agent;

step 4, coating glass fiber reinforced plastic on the surface of the chimney;

2. The anticorrosion construction process for the concrete or brick-based chimney as claimed in claim 1, wherein the polishing method in step 1 is: and carrying out sand blasting operation on the inner wall by adopting iron ore sand.

3. The anticorrosion construction process for a concrete or brick-based chimney as claimed in claim 2, wherein the distance between the muzzle and the inner wall of the chimney is 200-300mm during sand blasting, and the angle between the muzzle and the inner wall of the chimney is 15-30 °.

4. The concrete or brick-based chimney corrosion prevention construction process according to claim 1, wherein the inner wall is maintained for 24 hours after the repair in the step 2, and is naturally air-dried for 7 days.

5. The concrete or brick-based chimney corrosion prevention construction process according to claim 1, wherein in the step 4, the glass fiber reinforced plastic comprises UFC paint and glass fiber cloth, the UFC paint is firstly coated on the surface of the chimney, and then the glass fiber cloth is pasted.

6. The concrete or brick-based chimney corrosion prevention construction process according to claim 5, wherein the coating is continuously coated on the surface of the glass fiber cloth, and the glass fiber cloth is continuously attached to the surface of the coating, so that three layers of glass fiber cloth and four layers of coating are formed.

7. The concrete or brick-based chimney corrosion prevention construction process according to claim 6, wherein the UFC coating is a mixture comprising an initiator and an accelerator, and impurities and large particles are filtered after the mixture is uniformly stirred.

8. The anticorrosion construction process for the concrete or brick-based chimney as claimed in claim 6, wherein the glass fiber cloth is overlapped by 50mm in the vertical and horizontal gaps.

9. The anticorrosion construction process of a concrete or brick-based chimney according to claim 1, wherein the glass fiber reinforced plastic in step 4 is physically reinforced after being constructed, and the method comprises the following steps: and finally, integrally processing the exposed part of the nail cap by adopting the stainless steel nail with the volume of 5 cm and 7 fixed points per square meter.

10. The concrete or brick-based chimney anticorrosion construction process according to claim 1, wherein the thickness of the nano hybrid polymer in the step 5 is more than or equal to 1.5 mm.