CN114410316A - Method for preventing corrosion of coke oven bridge pipe in coke oven production - Google Patents

Abstract

The invention discloses a method for preventing corrosion of a bridge pipe of a coke oven in coke oven production, which comprises the following steps: s1, reforming the bridge pipe to reduce ammonia corrosion; s2, brushing the wall of the bridge pipe with a high-temperature-resistant anticorrosive paint; s3, solving the corrosion crack of the bridge pipe by adopting a ring-wrapping leakage control method. The invention provides a method for preventing corrosion of a coke oven bridge pipe in coke oven production, which ensures the stable and smooth running of the coke oven, reduces environmental pollution and eliminates potential safety hazard.

Description

Method for preventing corrosion of coke oven bridge pipe in coke oven production

Technical Field

The invention relates to the technical field of coal chemical industry, in particular to a method for preventing corrosion of a coke oven bridge pipe in coke oven production.

Background

The coke oven bridge pipe is a device for cooling and guiding out the crude gas generated by the coke oven by connecting an ascending pipe and a gas collecting pipe, the crude gas with the temperature of about 800 ℃ enters the bridge pipe from the ascending pipe, and an ammonia water spraying device on the bent pipe of the bridge pipe continuously sprays ammonia water to cool the crude gas to about 80 ℃. The bridge pipe body is mostly made of cast iron, the pipeline is provided with a bell and spigot, a valve body turning plate and other parts, one end of the bridge pipe is connected with the ascending pipe, and one end of the valve body is connected with the gas collecting pipe so as to realize the connection and the closing of the gas collecting pipe and the ascending pipe. The bridge pipe is also provided with high-pressure and low-pressure ammonia water spraying devices and cleaning holes, wherein the high-pressure ammonia water is used for coal charging, smoke prevention and dust reduction, and the low-pressure ammonia water is used for cooling the raw gas and the gas collecting pipe.

The problem of corrosion and damage of the bridge pipe of the coke oven is a technical difficulty which troubles the production of the coke oven, and particularly, the phenomena of corrosion, even damage and cracking of the bridge pipe and a valve body of the aged coke oven with longer production period exist in different degrees. If the bridge pipe is cracked, the raw gas generated by the carbonization chamber can directly escape from the cracked part of the bridge pipe to the atmosphere through the ascending pipe, which not only causes environmental pollution and influences the safe and clean production of the coke oven, but also causes the raw gas resource loss and leads to the reduction of the recovery rate of the chemical products. Therefore, how to prevent the corrosion damage problem of the bridge pipe, corresponding protection and treatment measures are adopted to ensure stable and smooth production, and meanwhile, the potential safety hazard is eliminated, the environmental pollution is reduced, and the high attention of the coking industry is aroused.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a method for preventing the corrosion of a bridge pipe of a coke oven, which ensures the stable and smooth running of the coke oven, reduces the environmental pollution and eliminates the potential safety hazard.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention relates to a method for preventing corrosion of a bridge pipe of a coke oven in coke oven production, which comprises the following steps:

s1, reducing ammonia corrosion by modifying bridge pipe

Increasing the height of the bridge pipe filler to 20-30 mm to ensure the filling and tamping of the filler, sealing a gap between the bridge pipe and the valve body by using an asbestos rope, forming a liquid seal by using ammonia water, and reducing oxygen in the air at the seam allowance to participate in chemical reaction; meanwhile, the sizes of the bridge pipe and the stainless steel sleeve in the valve body are modified, under the condition of ensuring the height of the liquid level of the ammonia water, the depth of the bridge pipe inserted into the valve body is increased to 20-30 mm, and the height of the stainless steel sleeve in the valve body is reduced to 70-80 mm, so that the liquid level of the ammonia water is reduced, and the contact and adsorption of bridge pipe fillers such as asbestos ropes, refractory mud materials and the like and the ammonia water are reduced;

s2, brushing the wall of the bridge pipe with high-temperature-resistant anticorrosive paint

The organic silicon high-temperature-resistant paint is coated on the surface of the pipe wall of the bridge pipe to play an effective high-temperature-resistant and corrosion-resistant protection role, so that the service life of the bridge pipe is prolonged;

s3, solving corrosion cracks of bridge pipe by adopting a ring-wrapping leakage control method

For slight or strip-shaped bridge pipe corrosion and holes, corrosion cracks are solved by using a ring-wrapping leakage control method, namely, a metal plate is used for ring-wrapping repair on the corrosion crack positions.

Further, the step S2 specifically includes:

s2.1: before painting, dust, oil, welding slag, rust and old paint films on the wall surface of the bridge pipe are cleaned, the surface of steel is required to be sandblasted and shot-blasted to Sa2.5 grade, and the local repair surface is required to be polished to St3 grade; water is strictly prevented from being brought in during construction;

s2.2: the organic silicon high-temperature resistant coating is uniformly stirred and then uniformly coated on the surface of the pipe wall of the bridge pipe, so that the high-temperature resistant and corrosion resistant effects are achieved.

Further, the step S3 specifically includes:

s3.1, cutting a metal pressing plate with a corresponding size according to the length of the crack of the bridge pipe, and bending the metal pressing plate to be consistent with the radian of the outer surface of the bridge pipe at the crack to be compensated;

and S3.2, welding arc-shaped connecting pieces at two ends of the metal plate respectively, wrapping the metal plate on the outer side of the pipe wall of the bridge pipe to be repaired in a surrounding manner, fixing the metal plate by the arc-shaped connecting pieces, and firmly bonding the metal plate.

Compared with the prior art, the invention has the beneficial technical effects that:

the invention provides a method for preventing a coke oven bridge pipe from being corroded and damaged, which adopts corresponding protection and treatment measures to ensure stable and smooth production, simultaneously eliminates potential safety hazards and reduces environmental pollution, and has obvious economic benefit and wide application prospect.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

FIG. 1 is a schematic structural view of a bridge pipe of an original coke oven;

FIG. 2 is a structural schematic diagram of a coke oven bridge pipe after being modified;

description of reference numerals: 1. filling bridge pipes; 2. an asbestos cord; 3. stopping the opening; 4. ammonia water; 5. a stainless steel sleeve; 6. ammonia water level, 7, bridge pipe; 8. a valve body.

Detailed Description

As shown in figures 1 and 2, in order to prevent the problem of corrosion and damage of the coke oven bridge pipe, the invention provides a method for preventing the corrosion of the coke oven bridge pipe, which ensures the stable and smooth running of the coke oven, reduces the environmental pollution and eliminates the potential safety hazard.

The present invention will be described in detail with reference to specific examples.

A method for preventing corrosion of a bridge pipe of a coke oven specifically comprises the following steps:

s1, reducing ammonia corrosion by modifying bridge pipe

The height of the bridge pipe filler 1 is increased to 20 mm-30 mm, the maintenance, supplement and tamping of the filler are enhanced, the filler is regularly checked every day to ensure that the filler is filled and tamped, the gap between the bridge pipe 7 and the valve body 8 is sealed by the asbestos rope 2, a liquid seal is formed by ammonia water 4, and oxygen in the air of the spigot 3 is reduced to participate in chemical reaction. Meanwhile, the sizes of the stainless steel sleeve 5 in the bridge pipe 7 and the valve body 8 are modified, under the condition that the height of the ammonia water liquid level 6 is guaranteed, the height of the stainless steel sleeve in the valve body is reduced to 70-80 mm, the depth of the bridge pipe inserted and bent valve body is increased to 20-30 mm, the ammonia water liquid level 6 is reduced, contact and adsorption of bridge pipe fillers 1 such as asbestos ropes 2 and refractory pugs and the ammonia water 4 are reduced, and the condition that sediments and the ammonia water 4 coexist on the outer wall of the bridge pipe is damaged.

S2, brushing the wall of the bridge pipe with high-temperature-resistant anticorrosive paint

The wall of the bridge pipe is coated with organosilicon high-temperature resistant paint and the like, the material can resist the high temperature of over 800 ℃, the coating can play an effective high-temperature resistant and corrosion resistant protection role on the surface of the wall of the bridge pipe, and the service life of the bridge pipe is prolonged.

S2.1: before coating, the dust, oil, welding slag, rust, old paint film and the like on the surface of an object need to be cleaned, the surface of steel needs to be sandblasted and shot-blasted to Sa2.5 grade, and the surface of local repair needs to be polished to St3 grade. Water is strictly prevented from being brought in during construction.

S2.2: the organic silicon high-temperature resistant coating is uniformly stirred and then uniformly coated on the surface of the pipe wall of the bridge pipe, so that the high-temperature resistant and corrosion resistant effects are achieved.

S2.3: the paint is too thick and can be diluted by a special diluent, and the materials which are not prepared are sealed and stored.

S2.4: and stopping construction in rainy days or when the relative humidity is more than 75 percent.

S2.5: the product should be stored in a cool and dry place to prevent direct sunlight irradiation, isolate the fire source and keep away from the heat source.

S2.6: the storage period is twelve months, and after the storage period is expired, various technical indexes are required to be checked, and the storage period can be continuously used if the index requirements are met.

S3, solving corrosion cracks of bridge pipe by adopting a ring-wrapping leakage control method

For slight or strip-shaped bridge pipe corrosion and holes, corrosion cracks are solved by using a ring-wrapping leakage control method, namely, a metal plate is used for ring-wrapping repair on the corrosion crack positions.

And S3.1, cutting a metal pressing plate with a corresponding size according to the length of the crack of the bridge pipe, and bending the metal pressing plate to be consistent with the radian of the outer surface of the bridge pipe at the crack to be compensated.

And S3.2, welding arc-shaped connecting pieces at two ends of the metal plate respectively, wrapping the metal plate on the outer side of the pipe wall of the bridge pipe to be repaired in a surrounding manner, fixing the metal plate by the arc-shaped connecting pieces, and firmly bonding the metal plate.

S3.3, the method for treating leakage by using the ring-wrapped method is simple to operate, short in repairing time and low in cost, and the service cycle of the bridge pipe is effectively prolonged.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (3)

1. A method for preventing corrosion of a bridge pipe of a coke oven in coke oven production is characterized by comprising the following steps:

s1, reducing ammonia corrosion by modifying bridge pipe

The height of the bridge pipe filler (1) is increased to 20-30 mm, the filling and tamping of the filler are ensured, the gap between the bridge pipe (7) and the valve body (8) is sealed by the asbestos rope (2), liquid seal is formed by ammonia water (4), and oxygen in the air of the spigot (3) is reduced to participate in chemical reaction; meanwhile, the sizes of the bridge pipe (7) and the stainless steel sleeve (5) in the valve body (8) are modified, under the condition that the height of the ammonia water liquid level (6) is ensured, the depth of the bridge pipe inserted into the valve body is increased to 20-30 mm, the height of the stainless steel sleeve in the valve body is reduced to 70-80 mm, so that the ammonia water liquid level (6) is reduced, and the contact and adsorption between bridge pipe fillers (1) such as asbestos ropes (2), refractory pugs and the like and ammonia water (4) are reduced;

s2, brushing the wall of the bridge pipe with high-temperature-resistant anticorrosive paint

The organic silicon high-temperature-resistant paint is coated on the surface of the pipe wall of the bridge pipe to play an effective high-temperature-resistant and corrosion-resistant protection role, so that the service life of the bridge pipe is prolonged;

s3, solving corrosion cracks of bridge pipe by adopting a ring-wrapping leakage control method

For slight or strip-shaped bridge pipe corrosion and holes, corrosion cracks are solved by using a ring-wrapping leakage control method, namely, a metal plate is used for ring-wrapping repair on the corrosion crack positions.

2. The method for preventing corrosion of the bridge tube of the coke oven in the production of the coke oven as claimed in claim 1, wherein the step S2 specifically comprises:

s2.1: before painting, dust, oil, welding slag, rust and old paint films on the wall surface of the bridge pipe are cleaned, the surface of steel is required to be sandblasted and shot-blasted to Sa2.5 grade, and the local repair surface is required to be polished to St3 grade; water is strictly prevented from being brought in during construction;

s2.2: the organic silicon high-temperature resistant coating is uniformly stirred and then uniformly coated on the surface of the pipe wall of the bridge pipe, so that the high-temperature resistant and corrosion resistant effects are achieved.

3. The method for preventing corrosion of the bridge tube of the coke oven in the production of the coke oven as claimed in claim 1, wherein the step S3 specifically comprises:

s3.1, cutting a metal pressing plate with a corresponding size according to the length of the crack of the bridge pipe, and bending the metal pressing plate to be consistent with the radian of the outer surface of the bridge pipe at the crack to be compensated;

and S3.2, welding arc-shaped connecting pieces at two ends of the metal plate respectively, wrapping the metal plate on the outer side of the pipe wall of the bridge pipe to be repaired in a surrounding manner, fixing the metal plate by the arc-shaped connecting pieces, and firmly bonding the metal plate.

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