CN109681863A - A kind of feed back pipeline repair technology of circulating fluidized bed boiler - Google Patents
A kind of feed back pipeline repair technology of circulating fluidized bed boiler Download PDFInfo
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- CN109681863A CN109681863A CN201910005461.0A CN201910005461A CN109681863A CN 109681863 A CN109681863 A CN 109681863A CN 201910005461 A CN201910005461 A CN 201910005461A CN 109681863 A CN109681863 A CN 109681863A
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- Prior art keywords
- feed back
- hexsteel
- castable
- bitch
- repair technology
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
A kind of repair technology of circulating fluidized bed boiler feed back pipeline, feed back pipeline include shell and refractory material, and the processing step is as follows: determining the slump position of refractory material, expose shell；At slump position, the inner wall of corresponding housing welds bitch；Silicate aluminum board is pasted along the inner wall of shell；Insulation castable is poured on the inside of silicate aluminum board；The ramming corrosive-proof plastic material in insulation castable；It is laid with hexsteel except corrosive-proof plastic material, and hexsteel and bitch are welded.Repair technology provided by the invention overcomes the complicated technology of board-like perfusion pouring material, castable and surrounding after making sectional repair form an entirety, anchoring ability is strong, extend the cycle of operation of boiler, reduce the secondary collapsing bring loss of castable, the incidence for reducing boiler breakdowns reduces the loss of castable slump bring.
Description
Technical field
This patent disclosure relates generally to the repair technologies of boiler, more particularly, to a kind of feed back pipe of circulating fluidized bed boiler
Line local repair process.
Background technique
Circulating fluidized bed boiler technology belongs to clean efficient combustion technology, and application prospect is wide, especially for unburnable coal, closes
Reason this efficiently, coal combustion technology of low pollution using recirculating fluidized bed, is easy to obtain preferable economic benefit, is conducive to abundant benefit
With energy resources and environment protection.
The feeding back device of circulating fluidized bed boiler is that the high-temperature material that the cyclone separator of boiler is separated passes through back
Material wind is sent to the burner hearth of boiler, so that material is carried out circulating combustion, improves the efficiency of combustion of boiler, thus feeding back device for
The burning of entire circulating fluidized bed boiler and efficiency are most important.
The feeding back device of existing circulating fluidized bed boiler includes material returning device pipeline, feed back valve body, the manufacture of feed back pipeline
It is at low cost, as long as with castable moulding by casting, but its refractory material for pouring is in the common of thermal cycle and mechanical oscillation
Under effect, slump is often generated, once feed back pipeline local caburizing material generates slump, external steel plate burns red, steel plate burn-through, high temperature
Returning charge ash will gush, and boiler also necessary blowing out maintenance, the loss after blowing out is larger, if not blowing out carries out sectional repair,
Because the castable of castable and periphery after repairing is not an entirety, crystallized ability is weaker, and service life is shorter, same meeting
It causes damages.
Therefore, the feed back pipeline refractory material crystallized ability after need to providing a kind of repairing is strong, the longer feed back of service life
Pipeline local repair process
Summary of the invention
The present invention provides feed back pipeline refractory material crystallized ability after a kind of repairing is strong, and then make the feed back pipe after repairing
The line feed back pipeline local repair process that the service life is longer.
In order to achieve the above objectives, the present invention provides the following technical scheme that
A kind of repair technology of circulating fluidized bed boiler feed back pipeline, feed back pipeline include shell and pour in inner walls
Refractory material, the processing step is as follows: determining the slump position of refractory material, exposes shell；Shell is corresponded at slump position
The inner wall of body welds bitch；Silicate aluminum board is pasted along the inner wall of shell；Insulation castable is poured on the inside of silicate aluminum board；?
It is insulated ramming corrosive-proof plastic material in castable；It is laid with hexsteel except corrosive-proof plastic material, and hexsteel and bitch are welded.
Preferably, the bitch is Y-shaped.
Preferably, the classification temperature of the silicate aluminum board is 1250 DEG C, and bulk density is 128 ± 13kg/m3, tension is strong
Degree >=0.04MPa, the thermal coefficient < 0.153W/mk being averaged at 500 DEG C.
Preferably, it is described insulation castable 1350 DEG C of refractoriness >, using 1000 DEG C of temperature, bulk density 800~
1000kg/m3, thermal coefficient < 0.16W/mk at 1000 DEG C.
Preferably, refractoriness >=1790 DEG C of the corrosive-proof plastic material, be 1500 DEG C, bulk density 2500 using temperature
~2700kg/m3, thermal coefficient < 1.5W/mk at 1000 DEG C.
Preferably, the refractory material of the feed back pipeline is made of primary concreting.
Preferably, the bitch quantity is identical as the hexagonal apertures number of hexsteel.
Preferably, the hexsteel is greater than slump position.
The utility model has the advantages that repair technology provided by the invention overcomes the complicated work of board-like perfusion pouring material in original technique
Skill, while enhancing the castable after sectional repair and surrounding forms an entirety, anchoring ability is strong, can prolonged boiler fortune
The row period reduces the secondary collapsing bring loss of castable, reduces the incidence of boiler breakdowns, reduce castable slump and bring
Loss.
Detailed description of the invention
The structural schematic diagram of Fig. 1 feed back pipeline local repair process provided by the invention；
Another excellent structural schematic diagram selected by Fig. 2 construction technology of the present invention；
The schematic diagram of Fig. 3 circulating fluidized bed boiler；
The structural schematic diagram of Fig. 4 feeding back device；
Fig. 5 feed back pipeline castable slump schematic diagram；
Wherein: 1: burner hearth；2: feeding back device；21: feed back pipeline: 211: returning charge channel；212: refractory material；213: shell
Body；214: at castable slump；215: insulation castable；216: corrosive-proof plastic material；217: bitch；218: hexsteel；219: silicon
Sour aluminium sheet；22: feed back valve body；3: cyclone separator；4: furnace outlet flue；5: Cyclone outlet flue；6: high temperature mistake
Hot device；7: low temperature superheater；8: economizer；9: air preheater.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, and reference label refers to the group in the present invention
Part, technology, realizing under appropriate circumstances so as to advantages and features of the invention can be easier to be understood.Following description is pair
The materialization of the claims in the present invention, and other specific implementations not clearly stated relevant to claim also belong to power
The range that benefit requires.
As shown in figure 3, be circulating fluidized bed boiler schematic diagram, circulating fluidized bed boiler include burner hearth 1, feeding back device 2,
Cyclone separator 3, high temperature superheater 6, low temperature superheater 7, economizer 8 and air preheater 9.Wherein, cyclone separator 3 is upper
Portion is connect with burner hearth 1 by furnace outlet flue 4, while the top of cyclone separator 3 is same by Cyclone outlet flue 5
When connect with high temperature superheater 6, high temperature superheater 6, low temperature superheater 7, economizer 8 and air preheater 9 are sequentially connected, whirlwind
3 lower part outlet of separator is connected with for the feeding back device 2. to 1 feed back of burner hearth.
When work, fuel particle through burner hearth 1 burning after flue gas (including uncombusted burning particles, burning dust and
Burning gases) enter cyclone separator 3, the returning charge that cyclone separator 3 is isolated is grey (including fuel particle and fuel dust)
It is again introduced into burner hearth 1 through feeding back device 2 to burn, the flue gas that cyclone separator 3 is isolated is drained into through Cyclone outlet flue 5
High temperature superheater 6 passes sequentially through low temperature superheater 7, economizer 8 and the output flue gas of air preheater 9 and enters subsequent handling.
As shown in figure 4, being the structural schematic diagram of feeding back device, feeding back device includes feed back pipeline 21 and feed back valve body 22,
Feed back pipeline 21 is the pipeline being obliquely installed, and is connect with burner hearth bottom；Feed back valve body 22 is the pipeline of bending structure, reduces rotation
The feed back speed of wind separator 3.
When work, feeding back device 2 is connected with cyclone separator 3 and burner hearth 1 respectively, unreacted in cyclone separator 3
Complete material returns in burner hearth 1 again by feeding back device 2 to be rekindled.
As shown in figure 5, being feed back pipeline castable slump schematic diagram, feed back pipeline 21 includes shell 213, returning charge channel
211 and it is tightly attached to the refractory material 212 of the inside of shell 213.21 manufacturing cost of feed back pipeline is lower, as long as being poured with castable
Molding, the refractory material 212 of 21 centre of feed back pipeline can generate slump under thermal cycle and mechanical oscillation collective effect,
Part refractory material 212 is fallen, and is formed 214 at castable slump, once local caburizing's material of feed back pipeline 21 generates slump, steel
The shell 213 of system can burn red, burn-through, high temperature returning charge ash will gush, and boiler also must blowing out maintenance.
As shown in Figure 1, being the structural schematic diagram of feed back pipeline local repair process provided by the invention.In feed back pipeline shell
Body 213 is equipped with bitch 217, and silicate aluminum board 219 is equipped on the outside of bitch 217, is insulation castable 215 on the outside of silicate aluminum board 219,
It is insulated on the outside of castable 215 and is equipped with one layer of corrosive-proof plastic material 216,216 outside of corrosive-proof plastic material is fixed by hexsteel 218, tortoise plastron
Net 218 and bitch 217 weld.
Hexsteel 218 is the hexagon being assembled into through professional equipment punching press by high temperature resistant, corrosion resistant particulate metal material
Two fulcrums of stereoscopic graticule, the six mutual connection in the hole Bian Junyou, flexible radian and bitch weld together, then use anti-wear plastic
Expect 216 filling pores, increase service life, and be fixed using hexsteel, insulation castable 215 will not peel off, and enhance
Anchoring ability between insulation castable 215 and shell 213, long service life.
Processing step is as follows:
(1) determine slump position: first determine slump position and size, prepare suitable material, to slump position into
Row cleaning, removes the remaining refractory material in the position, exposes shell；
(2) weld bitch on the shell at slump position: the length of bitch is 280mm, diameter 8mm；
(3) it is close to one layer of silicate aluminum board on the shell at feed back pipeline slump position；
(4) insulation is poured in the inside of silicate aluminum board
Castable, the insulation castable are refractory material；
(5) the ramming corrosive-proof plastic material in insulation castable；
(6) hexsteel is laid with except corrosive-proof plastic material, hexsteel be welded and fixed with what pawl was followed closely.
Processing step provided by the invention, on the basis of original simple pouring fireproof material is repaired, addition
Silicate aluminum board 219 and corrosive-proof plastic material 216, and it is fixed with bitch 217 and hexsteel 218, silicate aluminum board 219
Addition, it is therefore prevented that metal of the insulation castable 215 being newly poured directly with shell 213 is fixed, influence casting stabilization
Property；Hexsteel 218 is used as a kind of high temperature resistant, fire resisting, corrosion-resistant preferred material, and fixed effect can be enhanced, be allowed to stronger,
The addition of corrosive-proof plastic material 216 then fills the hole of hexsteel, it is therefore prevented that feed back ash is logical in the returning charge of feed back pipeline
When passing through in road 211, the deposition in 218 hole of hexsteel.
Silicate aluminum board 219, through 2000 DEG C or more furnace meltings, blows out fiber by mechanical spray by selected good flint clay
And be uniformly added into special binder, oil-proofing agent, water-repellent agent and be heating and curing, it is mainly used for power industry, electric boiler, vapour
Turbine and nuclear power are heat-insulated, and the fire-proof and thermal-insulation of shipping industry, construction industry, the fire-proof and thermal-insulation of fire resistant doorsets, chemical engineering industry pyroreaction are set
Standby and heating equipment wall liner, automobile, train manufacturing industry, fire prevention, heat-insulated, kiln lining-up etc..Silicate aluminum board used in the present invention
Classification temperature be 1250 DEG C, bulk density be 128 ± 13kg/m3, tensile strength >=0.04MPa, be averaged leading at 500 DEG C
Hot coefficient < 0.153W/mk.
The silicate aluminum board bulk density that the present invention selects is higher, and tensile strength is larger, and thermal coefficient is low, can be in furnace body more
Good plays heat-insulated effect.
Insulation castable 215 will have high temperature resistant and wearability in feed back pipeline, and feed back pipeline is as recirculating fluidized bed
The pith of boiler revert system, a large amount of imperfect combustion fuel, dust and hot fumes etc. are entered by feed back pipeline to be followed
Ring fluid bed boiler furnace realizes the process of " returning charge-circulation ".Therefore, insulation castable should have high temperature resistant and wearability,
Also want to resist the erosion of high-temperature dust and flue gas.1350 DEG C of the refractoriness > for the insulation castable that the present invention selects, using temperature
Spend 1000 DEG C, 800~1000kg/m of bulk density3, thermal coefficient < 0.16W/mk at 1000 DEG C.
The insulation castable fire-resistant degree that the present invention selects is higher, and bulk density is high, and thermal coefficient is low, ensure that casting
The Long Service Life of material.
Corrosive-proof plastic material 216 is one kind of amorphous refractory, is to add the bonding agents such as fat clay by granular material
And the wearing-proof refractory material that appropriate plasticizer is formulated.Refractoriness >=1790 DEG C for the corrosive-proof plastic material that the present invention selects,
Using temperature be 1500 DEG C, bulk density is 2500~2700kg/m3, thermal coefficient < 1.5W/mk at 1000 DEG C.
Ramming, which refers to, beats amorphous refractory, hardens it under the heat effect for being higher than room temperature
A kind of form of construction work is not required using shape of this method for slump position, is suitable for the shape ramming at the slump position
Enter to be suitable for the corrosive-proof plastic material of the shape.
The corrosive-proof plastic material refractoriness that the present invention selects is high, and, bulk density height high using temperature, thermal coefficient are smaller, fills out
Better fixed function can be played by being charged in the hole of hexsteel, and as one layer contacted with feed back ash, refractoriness is high, makes
It is guaranteed with the service life.
Bitch is the castable refractory, plastic refractory and fire-proof spray coating for supporting and fixing relatively thin liner body.This hair
Bright bitch is Y type bitch, and the head of Y type is preferably to be welded with hexsteel, and two fulcrums are welded together with hexsteel.
The selection of the bitch, so that the welding of hexsteel and feed back pipeline shell is stronger.
The refractory material of feed back pipeline is primary concreting molding.
More stable on the molding structure of refractory of primary concreting, anchoring ability is strong, is not likely to produce slump, and disposable
Pour that cost is relatively low.
Bitch quantity is identical as the hexagonal apertures number of hexsteel,
In order to the firm welding with hexsteel, there is stronger anchoring ability.
Hexsteel is slightly larger than slump position,
Hexsteel is greater than slump position, can make to repair position and original refractory material as an entirety, anchoring ability
It is stronger can be with the cycle of operation of prolonged boiler.
As shown in Fig. 2, for another excellent structural schematic diagram selected by construction technology of the present invention.
It is equipped with bitch 217 on feed back pipeline shell 213, is equipped with silicate aluminum board 219, silicate aluminum board 219 on the outside of bitch 217
Outside is insulation castable 215, is insulated on the outside of castable 215 and is equipped with one layer of corrosive-proof plastic material 216,216 outside of corrosive-proof plastic material
It is fixed by hexsteel 218, hexsteel 218 and bitch 217 weld.
Hexsteel 218 is the hexagon being assembled into through professional equipment punching press by high temperature resistant, corrosion resistant particulate metal material
Two fulcrums of stereoscopic graticule, the six mutual connection in the hole Bian Junyou, flexible radian and bitch weld together, then use anti-wear plastic
Expect 216 filling pores, increase service life, and be fixed using hexsteel, insulation castable 215 will not peel off, and enhance
Anchoring ability between insulation castable 215 and shell 213, long service life.
Processing step is as follows:
(1) determine slump position: first determine slump position and size, prepare suitable material, to slump position into
Row cleaning, removes the remaining refractory material in the position, exposes shell；
(2) weld bitch on the shell at slump position: the length of bitch is 280mm, diameter 8mm；
(3) it is close to one layer of silicate aluminum board on the shell at feed back pipeline slump position；
(4) in the inside of silicate aluminum board casting insulation castable, the insulation castable is refractory material；
(5) the ramming corrosive-proof plastic material in insulation castable；
(6) hexsteel is laid with except corrosive-proof plastic material, hexsteel be welded and fixed with what pawl was followed closely.
Processing step provided by the invention, on the basis of original simple pouring fireproof material is repaired, addition
Silicate aluminum board 219 and corrosive-proof plastic material 216, and it is fixed with bitch 217 and hexsteel 218, silicate aluminum board 219
Addition, it is therefore prevented that metal of the insulation castable 215 being newly poured directly with shell 213 is fixed, influence casting stabilization
Property；Hexsteel 218 is used as a kind of high temperature resistant, fire resisting, corrosion-resistant preferred material, and fixed effect can be enhanced, be allowed to stronger,
The addition of corrosive-proof plastic material 216 then fills the hole of hexsteel, it is therefore prevented that feed back ash is logical in the returning charge of feed back pipeline
When passing through in road 211, the deposition in 218 hole of hexsteel.
Ramming, which refers to, beats amorphous refractory, hardens it under the heat effect for being higher than room temperature
A kind of form of construction work is not required using shape of this method for slump position, is suitable for the shape ramming at the slump position
Enter to be suitable for the corrosive-proof plastic material of the shape.
Silicate aluminum board 219, through 2000 DEG C or more furnace meltings, blows out fiber by mechanical spray by selected good flint clay
And be uniformly added into special binder, oil-proofing agent, water-repellent agent and be heating and curing, it is mainly used for power industry, electric boiler, vapour
Turbine and nuclear power are heat-insulated, and the fire-proof and thermal-insulation of shipping industry, construction industry, the fire-proof and thermal-insulation of fire resistant doorsets, chemical engineering industry pyroreaction are set
Standby and heating equipment wall liner, automobile, train manufacturing industry, fire prevention, heat-insulated, kiln lining-up etc..Silicate aluminum board used in the present invention
Classification temperature be 1250 DEG C, bulk density be 128 ± 13kg/m3, tensile strength >=0.04MPa, be averaged leading at 500 DEG C
Hot coefficient < 0.153W/mk.
The silicate aluminum board bulk density that the present invention selects is higher, and tensile strength is larger, and thermal coefficient is low, can be in furnace body more
Good plays heat-insulated effect.
Insulation castable 215 will have high temperature resistant and wearability in feed back pipeline, and feed back pipeline is as recirculating fluidized bed
The pith of boiler revert system, a large amount of imperfect combustion fuel, dust and hot fumes etc. are entered by feed back pipeline to be followed
Ring fluid bed boiler furnace realizes the process of " returning charge-circulation ".Therefore, insulation castable should have high temperature resistant and wearability,
Also want to resist the erosion of high-temperature dust and flue gas.1350 DEG C of the refractoriness > for the insulation castable that the present invention selects, using temperature
Spend 1000 DEG C, 800~1000kg/m of bulk density3, thermal coefficient < 0.16W/mk at 1000 DEG C.
The insulation castable fire-resistant degree that the present invention selects is higher, and bulk density is high, and thermal coefficient is low, ensure that casting
The Long Service Life of material.
Corrosive-proof plastic material 216 is one kind of amorphous refractory, is to add the bonding agents such as fat clay by granular material
And the wearing-proof refractory material that appropriate plasticizer is formulated.Refractoriness >=1790 DEG C for the corrosive-proof plastic material that the present invention selects,
Using temperature be 1500 DEG C, bulk density is 2500~2700kg/m3, thermal coefficient < 1.5W/mk at 1000 DEG C.
The corrosive-proof plastic material refractoriness that the present invention selects is high, and, bulk density height high using temperature, thermal coefficient are smaller, fills out
Better fixed function can be played by being charged in the hole of hexsteel, and as one layer contacted with feed back ash, refractoriness is high, makes
It is guaranteed with the service life.
Bitch is the castable refractory, plastic refractory and fire-proof spray coating for supporting and fixing relatively thin liner body.This hair
Bright bitch is T-type bitch, and the head of T-type and hexsteel be more convenient when welding welding, and two fulcrums are welded together with hexsteel,
And T-type bitch will not more destroy material locating for the bitch main force compared with other types bitch.
The selection of the bitch, so that the welding of hexsteel and feed back pipeline shell is stronger.
The refractory material of feed back pipeline is disposable formwork pouring molding.
More stable on the molding structure of refractory of primary concreting, anchoring ability is strong, is not likely to produce slump, and disposable
Pour that cost is relatively low.
Bitch quantity is identical as the hexagonal apertures number of hexsteel,
In order to the firm welding with hexsteel, there is stronger anchoring ability.
Hexsteel is slightly larger than slump position,
Hexsteel is greater than slump position, can make to repair position and original refractory material as an entirety, anchoring ability
It is stronger can be with the cycle of operation of prolonged boiler.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and this
Field technical staff can be designed alternative embodiment without departing from the scope of the appended claims.In claim
In, any reference symbol between parentheses should not be configured to limitations on claims.
Claims (8)
1. a kind of repair technology of circulating fluidized bed boiler feed back pipeline, feed back pipeline includes shell and pours in inner walls
Refractory material, which is characterized in that the processing step is as follows:
It determines the slump position of refractory material, exposes shell；
At slump position, the inner wall of corresponding housing welds bitch；
Silicate aluminum board is pasted along the inner wall of shell；
Insulation castable is poured on the inside of silicate aluminum board；
The ramming corrosive-proof plastic material in insulation castable；
It is laid with hexsteel except corrosive-proof plastic material, and hexsteel and bitch are welded.
2. repair technology according to claim 1, which is characterized in that the bitch is Y-shaped.
3. repair technology according to claim 1, which is characterized in that the classification temperature of the silicate aluminum board is 1250 DEG C,
Its bulk density is 128 ± 13kg/m3, tensile strength >=0.04MPa, the thermal coefficient < 0.153W/m 〃 k being averaged at 500 DEG C.
4. repair technology according to claim 1, which is characterized in that 1350 DEG C of the refractoriness > of the insulation castable,
Use 1000 DEG C of temperature, 800~1000kg/m of bulk density3, thermal coefficient < 0.16W/m 〃 k at 1000 DEG C.
5. repair technology according to claim 1, which is characterized in that refractoriness >=1790 DEG C of the corrosive-proof plastic material,
Using temperature be 1500 DEG C, bulk density is 2500~2700kg/m3, thermal coefficient < 1.5W/m 〃 k at 1000 DEG C.
6. repair technology according to claim 1, which is characterized in that the refractory material of the feed back pipeline is disposably to pour
Made of building.
7. repair technology according to claim 1, which is characterized in that the hexagonal apertures of the bitch quantity and hexsteel
Number is identical.
8. repair technology according to claim 1, which is characterized in that the hexsteel is greater than slump position.
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| JP2021063628A (en) * | 2019-10-16 | 2021-04-22 | 住友金属鉱山株式会社 | Method for repairing seal pot of circulating fluidized bed boiler |
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| CN116293653A (en) * | 2023-03-27 | 2023-06-23 | 新疆华电米东热电有限公司 | Method for repairing internal defect of boiler material returning device |
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| CN112815726A (en) * | 2019-11-18 | 2021-05-18 | 苏州苏信特钢有限公司 | Flue repairing shell and flue repairing method |
| CN116293653A (en) * | 2023-03-27 | 2023-06-23 | 新疆华电米东热电有限公司 | Method for repairing internal defect of boiler material returning device |
| CN117399895A (en) * | 2023-12-13 | 2024-01-16 | 呼伦贝尔金新化工有限公司 | Online shutdown repair method for cracking of inner surface surfacing layer of flange on BGL gasifier |
| CN117399895B (en) * | 2023-12-13 | 2024-02-09 | 呼伦贝尔金新化工有限公司 | Online shutdown repair method for cracking of inner surface surfacing layer of flange on BGL gasifier |
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Application publication date: 20190426 |
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