阅读说明：本技术 一种处理焦炉桥管开裂事故的方法 (Method for processing cracking accident of coke oven bridge pipe ) 是由 付利俊 李晓炅 谢晓霞 庞文娟 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种处理焦炉桥管开裂事故的方法,能够快速有效处理桥管开裂事故,根据生产需求及时更换桥管,确保生产稳定顺行,同时消除安全隐患和环境污染,经济效益明显,应用前景广阔。(The invention discloses a method for processing cracking accidents of bridge pipes of a coke oven, which can quickly and effectively process the cracking accidents of the bridge pipes, timely replace the bridge pipes according to production requirements, ensure stable and smooth production, eliminate potential safety hazards and environmental pollution simultaneously, and has obvious economic benefit and wide application prospect.)

1. A method for processing cracking accidents of bridge pipes of a coke oven is characterized by comprising the following steps: the method comprises the following steps:

s1 pretreatment cracking bridge pipe

Before replacing the cracked bridge pipe, some pretreatment measures are taken to prevent the cracked bridge pipe from smoking and igniting, eliminate potential safety hazards and make preparation work and a careful plan for replacing the bridge pipe; the specific pretreatment measures are as follows:

s1.1: welding repair method

Checking the position and the length of a crack, thoroughly removing tar, sand, water, rust, a poor carbon layer and an oxide layer at the welding position of the surface of the crack of the bridge pipe, drilling crack-stopping holes at two ends of the crack by using a drill bit with the diameter of phi 3-5 mm, and then directly welding the crack by using a welding rod;

s1.2: clay fire clay sealing method

Mixing 55% of clay fire clay, 15% of clay powder and 30% of water glass uniformly, and smearing and repairing the clay fire clay to the cracking position of the bridge pipe, wherein the problem that the cracking position of the bridge pipe is smoked and ignited is temporarily solved by the method;

s1.3: wrapping method

The bridge pipe has large cracks, the cracking positions are special, and the cracks extend to the edge of the socket and cannot be welded; firstly, cleaning a crack, plugging the crack by using an asbestos rope soaked by water glass, then smearing clay fire clay around the crack to be solid, covering the clay fire clay by using a silicate heat-insulating material, and finally wrapping the silicate heat-insulating plate by using a cut galvanized iron plate and iron wires;

s2 scheme for replacing cracked bridge pipe

S2.1: determining a bridge pipe to be replaced, pre-arranging the replaced bridge pipe in advance, and replacing the bridge pipe in an empty furnace after coke pushing; before maintenance, the maintenance personnel and related preparation work are in place; according to the actual situation, the related bolts are disassembled or coiled in advance;

s2.2: dismantling each frame on the bridge pipe, and dismantling the connecting bolts of the bridge pipe and the ascending pipe at the same time; dismantling a power line of the instrument, an air source pipeline, a large ammonia water pipe, a small ammonia water pipe, an industrial water pipe and a steam pipe; dismantling a valve positioner, a pressure gauge, a cable duct and pipe connecting joints;

s2.3: plugging connecting grooves of the water seal seats of the ascending pipes, which are to be cut off at two sides, by asbestos ropes, welding and cutting the water seal grooves by maintainers, and removing flange connecting bolts at the ammonia water nozzles; after the ascending pipe is pulled up by a crane, furnace mouths of 3 and 4 holes of the corresponding carbonization chambers are opened, an air pipe is inserted into the ascending pipe and firmly fixed, and the upward air flow is controlled by opening the power air pressure so as to prevent the upward fire and the hot air flow from hurting people;

s2.4: connecting a riser water seal seat, righting a new bridge pipe with bricks, placing a circle of graphite gasket on a flange, hoisting the water seal seat on the bridge pipe by using a crane, and connecting a fixing bolt after the water seal seat is aligned; the crane lifts the new bridge pipe back to the original position, the bridge pipe socket is inserted into the valve body, and the bolt connection is well fastened after the bridge pipe is reinstalled;

s2.5: the frames on the bridge pipe are back-assembled and welded and are connected by bolts; firstly, connecting fast injection pipelines, then opening ammonia water, installing sealing gaskets on an ascending pipe and a bridge pipe, fastening screws, and reinstalling wiring for each instrument; the cup valve is connected with the cylinder and debugged; power supply, air supply, valve opening, and debugging and recovering of each instrument; after the cup valve is adjusted normally, the carbonization chamber is arranged for coal charging, and normal production is recovered.

2. The method for handling cracking accidents of coke oven bridge pipes according to claim 1, wherein the method comprises the following steps: also comprises the following steps:

s3 notes

S3.1: when the crane pulls up the whole riser, nitrogen or other compressed air is used for pressing the flame of the riser hole seat, so that the flame is prevented from burning nearby operators;

s3.2: covering a special grate on the opened furnace mouth to prevent operators from inadvertently falling into the carbonization chamber when walking during the operation of the furnace top; meanwhile, in the operation process, workers must wear working clothes and gloves, the rotation of the workers is strengthened, and heatstroke prevention medicines are reserved on site to prevent the workers from heatstroke;

s3.3: strictly forbidding walking or staying in areas of a second floor platform and a large lane for replacing bridge pipe furnace numbers, arranging warning lines in hoisting areas of the second floor platform and the large lane, and arranging special person monitoring to prevent other persons from entering an operation area.

3. The method for handling cracking accidents of coke oven bridge pipes according to claim 1, wherein the method comprises the following steps: the step S1.1 further includes:

a V-shaped groove is formed in advance for a bridge pipe which is seriously damaged according to the requirement, the angle of the groove is 60-70 degrees, the depth is 10mm, the two sides of the groove are polished by a steel wire brush or abrasive cloth within 2.5mm, impurities in the crack at the bottom of the slope are cleaned, the bridge pipe can be welded after being dried, and the depth of a welding seam and a molten pool can be widened to increase the strength of the bridge pipe after welding.

Technical Field

The invention relates to the technical field of coal chemical industry, in particular to a method for processing cracking accidents of a bridge pipe of a coke oven.

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 works in the environment of high temperature and ammonia water scouring all the year round, so that the equipment is easy to age and crack; in addition, the bridge pipe is made of cast iron, the performance is hard and brittle, when a raiser cleans the graphite of the bridge pipe, the raiser cover is manually opened 50min before pushing coke, the graphite in the bridge pipe is cleaned by matching an air pipe with a steel chisel, and the bridge pipe is damaged by continuous impact of the steel chisel because the hardness of the graphite is high and the graphite is knocked by a hammer or cleaned by the steel chisel sometimes, which is an important reason for cracking of the bridge pipe. The cracked part of the bridge pipe not only allows crude gas to escape, but also allows ammonia water to flow out from the cracked part, thereby bringing adverse effects to the surrounding environment. Meanwhile, ammonia water drops to the smoke baffle plate at the machine side and the gas collecting pipe to cause corrosion of the smoke baffle plate and the gas collecting pipe, so that safety crisis is brought to operators, and huge pressure is brought to safety and environmental protection of an operation area. Therefore, the bridge pipe cracking accident is quickly and effectively treated, the bridge pipe is timely replaced according to production requirements, stable and smooth production is ensured, potential safety hazards are eliminated, environmental pollution is reduced, and the problem to be solved urgently is solved when the bridge pipe cracking accident of the coke oven is treated.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a method for processing cracking accidents of a bridge pipe of a coke oven.

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

the invention relates to a method for processing cracking accidents of a bridge pipe of a coke oven, which comprises the following steps:

s1 pretreatment cracking bridge pipe

Before replacing the cracked bridge pipe, some pretreatment measures are taken to prevent the cracked bridge pipe from smoking and igniting, eliminate potential safety hazards and make preparation work and a careful plan for replacing the bridge pipe; the specific pretreatment measures are as follows:

s1.1: welding repair method

Checking the position and the length of a crack, thoroughly removing tar, sand, water, rust, a poor carbon layer and an oxide layer at the welding position of the surface of the crack of the bridge pipe, drilling crack-stopping holes at two ends of the crack by using a drill bit with the diameter of phi 3-5 mm, and then directly welding the crack by using a welding rod;

s1.2: clay fire clay sealing method

Mixing 55% of clay fire clay, 15% of clay powder and 30% of water glass uniformly, and smearing and repairing the clay fire clay to the cracking position of the bridge pipe, wherein the problem that the cracking position of the bridge pipe is smoked and ignited is temporarily solved by the method;

s1.3: wrapping method

The bridge pipe has large cracks, the cracking positions are special, and the cracks extend to the edge of the socket and cannot be welded; firstly, cleaning a crack, plugging the crack by using an asbestos rope soaked by water glass, then smearing clay fire clay around the crack to be solid, covering the clay fire clay by using a silicate heat-insulating material, and finally wrapping the silicate heat-insulating plate by using a cut galvanized iron plate and iron wires;

s2 scheme for replacing cracked bridge pipe

S2.1: determining a bridge pipe to be replaced, pre-arranging the replaced bridge pipe in advance, and replacing the bridge pipe in an empty furnace after coke pushing; before maintenance, the maintenance personnel and related preparation work are in place; according to the actual situation, the related bolts are disassembled or coiled in advance;

s2.2: dismantling each frame on the bridge pipe, and dismantling the connecting bolts of the bridge pipe and the ascending pipe at the same time; dismantling a power line of the instrument, an air source pipeline, a large ammonia water pipe, a small ammonia water pipe, an industrial water pipe and a steam pipe; dismantling a valve positioner, a pressure gauge, a cable duct and pipe connecting joints;

s2.3: plugging connecting grooves of the water seal seats of the ascending pipes, which are to be cut off at two sides, by asbestos ropes, welding and cutting the water seal grooves by maintainers, and removing flange connecting bolts at the ammonia water nozzles; after the ascending pipe is pulled up by a crane, furnace mouths of 3 and 4 holes of the corresponding carbonization chambers are opened, an air pipe is inserted into the ascending pipe and firmly fixed, and the upward air flow is controlled by opening the power air pressure so as to prevent the upward fire and the hot air flow from hurting people;

s2.4: connecting a riser water seal seat, righting a new bridge pipe with bricks, placing a circle of graphite gasket on a flange, hoisting the water seal seat on the bridge pipe by using a crane, and connecting a fixing bolt after the water seal seat is aligned; the crane lifts the new bridge pipe back to the original position, the bridge pipe socket is inserted into the valve body, and the bolt connection is well fastened after the bridge pipe is reinstalled;

s2.5: the frames on the bridge pipe are back-assembled and welded and are connected by bolts; firstly, connecting fast injection pipelines, then opening ammonia water, installing sealing gaskets on an ascending pipe and a bridge pipe, fastening screws, and reinstalling wiring for each instrument; the cup valve is connected with the cylinder and debugged; power supply, air supply, valve opening, and debugging and recovering of each instrument; after the cup valve is adjusted normally, the carbonization chamber is arranged for coal charging, and normal production is recovered.

Further, the method also comprises the following steps:

s3 notes

S3.1: when the crane pulls up the whole riser, nitrogen or other compressed air is used for pressing the flame of the riser hole seat, so that the flame is prevented from burning nearby operators;

s3.2: covering a special grate on the opened furnace mouth to prevent operators from inadvertently falling into the carbonization chamber when walking during the operation of the furnace top; meanwhile, in the operation process, workers must wear working clothes and gloves, the rotation of the workers is strengthened, and heatstroke prevention medicines are reserved on site to prevent the workers from heatstroke;

s3.3: strictly forbidding walking or staying in areas of a second floor platform and a large lane for replacing bridge pipe furnace numbers, arranging warning lines in hoisting areas of the second floor platform and the large lane, and arranging special person monitoring to prevent other persons from entering an operation area.

Further, step S1.1 further includes:

a V-shaped groove is formed in advance for a bridge pipe which is seriously damaged according to the requirement, the angle of the groove is 60-70 degrees, the depth is 10mm, the two sides of the groove are polished by a steel wire brush or abrasive cloth within 2.5mm, impurities in the crack at the bottom of the slope are cleaned, the bridge pipe can be welded after being dried, and the depth of a welding seam and a molten pool can be widened to increase the strength of the bridge pipe after welding.

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

the bridge pipe cracking accident can be quickly and effectively treated, the bridge pipe can be replaced in time according to production requirements, stable and smooth production is ensured, potential safety hazards and environmental pollution are eliminated, economic benefits are obvious, and the application prospect is wide.

Detailed Description

In order to solve the problem of cracking accidents of the bridge pipes of the coke oven, the invention provides a method for solving the cracking accidents of the bridge pipes of the coke oven, which ensures the normal and stable production of the coke oven, eliminates potential safety hazards and reduces environmental pollution.

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

A method for processing cracking accidents of a bridge pipe of a coke oven specifically comprises the following steps:

s1 pretreatment cracking bridge pipe

Before the cracked bridge pipe is replaced, a certain pretreatment measures are taken to prevent the cracked bridge pipe from smoking and igniting, eliminate potential safety hazards and make preparation work and a careful plan for replacing the bridge pipe.

S1.1: welding repair method

The method comprises the steps of firstly checking the position and the length of a crack, thoroughly removing tar, sand, water, rust, a poor carbon layer and an oxide layer at the welding position of the surface of the crack of the bridge pipe, drilling crack-stopping holes at two ends of the crack by using drill bits with the diameter of phi 3-5 mm, and then directly welding the crack by using welding rods.

A V-shaped groove is formed in advance for a severely damaged bridge pipe according to the requirement, the angle of the groove is 60-70 degrees, the depth is about 10mm (the thickness of the bridge pipe is more than 14 mm), the two sides of the groove are polished by a steel wire brush or abrasive cloth within 2.5mm, impurities in a crack at the bottom of the slope are cleaned, welding can be started after moisture is dried, the depth of a welding seam and a molten pool can be widened, and the strength of the bridge pipe after welding repair is increased.

S1.2: clay fire clay sealing method

55% of clay fire clay, 15% of clay powder and 30% of water glass (sodium silicate aqueous solution) are mixed and evenly mixed, the clay fire clay is smeared and supplemented to the cracking position of the bridge pipe, and the method temporarily solves the problem that the cracking position of the bridge pipe is smoked and ignited.

S1.3: wrapping method

The bridge pipe has large cracks, the cracking positions are special, the cracks extend to the edge of the socket, and welding cannot be performed. Firstly, cleaning a crack, plugging the crack with an asbestos rope (also called an aluminum silicate fiber rope, generally with the diameter of 10mm) soaked by water glass to prevent the crack from smoking, then smearing clay fire clay to the periphery of the crack to ensure that the thickness is 30-50 mm, covering the clay fire clay with a silicate heat-insulating material, and finally wrapping the silicate heat-insulating plate with a cut galvanized iron plate and an iron wire.

S2 scheme for replacing cracked bridge pipe

S2.1: determining the bridge pipe to be replaced, pre-arranging the replaced bridge pipe in advance, and replacing the empty furnace after coke pushing. Before maintenance, the maintenance personnel and related preparation work are in place. According to the actual situation, the related bolt is disassembled or coiled in advance.

S2.2: and (4) dismantling each frame on the bridge pipe, and dismantling the connecting bolt of the bridge pipe and the ascending pipe at the same time. Dismantling a power line of the instrument, an air source pipeline, a large ammonia water pipe, a small ammonia water pipe, an industrial water pipe and a steam pipe; and (4) removing the valve positioner, the pressure gauge and the cable duct and connecting joints of the pipes. The pressure of the gas collecting pipe is strictly regulated and controlled to be-80 to-100 Pa, and automatic regulation is kept.

S2.3: and (3) plugging the connecting grooves of the water seal seats of the ascending pipes, which are to be cut off at two sides, by using asbestos ropes, welding and cutting the water seal grooves by maintainers, and removing the flange connecting bolts at the ammonia water nozzles. After the ascending pipe is pulled up by crane, the furnace mouth with 3 or 4 holes of the corresponding carbonization chamber is opened, the air pipe is inserted into the ascending pipe and is firmly fixed by iron wire, etc., and the dynamic air pressure is opened to control the upward air flow so as to prevent the fire blow-by of the ascending pipe and the hot air flow from hurting people.

S2.4: connecting a riser water seal seat, righting a new bridge pipe with bricks, placing a circle of graphite gasket on the flange, hoisting the water seal seat by a crane, placing the water seal seat on the bridge pipe, aligning the water seal seat and connecting a fixing bolt. The crane lifts the new bridge pipe back to the original position, the bridge pipe socket is inserted into the valve body, and the bolt connection is fastened after the bridge pipe is reinstalled. The socket at the root of the bridge tube is sealed with asbestos cord (40mm asbestos cord, and soaked in advance), and the riser tube is sealed with clay mortar.

S2.5: and all frames on the bridge pipe are welded and connected by bolts. Firstly, connecting the fast injection pipelines, then opening ammonia water, installing sealing gaskets on the ascending pipe and the bridge pipe, fastening screws, and reinstalling connection wires for each instrument. The cup valve is connected with the cylinder and debugged; and (5) power transmission, air supply, valve opening and debugging and recovery of each instrument. Cup checking valve is adjusted normally

And then, arranging coal charging in the carbonization chamber, and recovering normal production.

S3 notes

S3.1: when the crane pulls up the whole riser, nitrogen (0.3-0.4 MPa) (or compressed air) is used for pressing flame of a riser hole seat, so that operators nearby the flame can be prevented from being burnt.

S3.2: a special grate is covered on the opened furnace mouth to prevent operators from inadvertently falling into the carbonization chamber when the operators walk during furnace top operation and the like. Meanwhile, in the operation process, workers must wear working clothes and gloves, the rotation of the workers is strengthened, and heatstroke prevention medicines are reserved on site to prevent the workers from heatstroke.

S3.3: strictly forbidding walking or staying in areas of a second floor platform and a large lane for replacing bridge pipe furnace numbers, arranging warning lines in hoisting areas of the second floor platform and the large lane, and arranging special person monitoring to prevent other persons from entering an operation area.

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.