CN107366780B - Method for replacing water outlet pipeline of high-pressure ammonia water pump of coke oven - Google Patents
Method for replacing water outlet pipeline of high-pressure ammonia water pump of coke oven Download PDFInfo
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- CN107366780B CN107366780B CN201610312365.7A CN201610312365A CN107366780B CN 107366780 B CN107366780 B CN 107366780B CN 201610312365 A CN201610312365 A CN 201610312365A CN 107366780 B CN107366780 B CN 107366780B
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- coke oven
- pipeline
- ammonia water
- pressure ammonia
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
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- Coke Industry (AREA)
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Abstract
The invention relates to a method for replacing a water outlet pipeline of a high-pressure ammonia water pump of a coke oven, which is characterized in that a new pipeline is laid in advance along the road line of an old pipeline, and the contact operation of the new pipeline and a valve is respectively carried out by utilizing the maintenance time of the coke oven, so that the high-pressure ammonia water pipeline is replaced without stopping production. Compared with the prior art, the invention has the beneficial effects that: laying a new pipeline along the old pipeline in advance, and utilizing the maintenance time of the coke oven to carry out the dismantling of the old pipeline and the joint operation of the new pipeline, wherein the joint operation time of each group of pipelines only needs 4 hours, and the high-pressure ammonia water pump outlet pipeline of the coke oven can be quickly, safely and stably replaced so as to achieve the aim of replacing the high-pressure ammonia water pipeline without stopping production. The thickness of the replaced pipeline wall is 10mm, so that the service life of the pipeline is effectively prolonged.
Description
Technical Field
The invention relates to the technical field of coking, in particular to a method for replacing a water outlet pipeline of a high-pressure ammonia water pump of a coke oven, which is used for replacing an outlet pipeline of the high-pressure ammonia water pump of the coke oven with the diameter of 7 m.
Background
The coking department of a certain steel branch company is provided with 3 high-pressure ammonia pumps for providing high-pressure ammonia water for 4 coke ovens (see figure 1). Wherein, the No. 1 high-pressure ammonia water pump is connected with the No. 1 coke oven and the No. 2 coke oven. The 3# high-pressure ammonia water pump is connected with the 3# coke oven and the 4# coke oven. The 2# high-pressure ammonia pump is standby equipment and is respectively connected with the 1# high-pressure ammonia pump pipeline and the 3# high-pressure ammonia pump pipeline through two valves M1 and M2, and during normal production, the 2# high-pressure ammonia pump is in a normally closed state.
The pipeline of 7 meters is arranged between the high-pressure ammonia water pump and the coke oven, the operation lasts for more than 6 years, and the pipe wall installed in the original design is thin (6mm), and the corrosion effect of ammonia water causes the following problems:
1) the whole pipe wall becomes thin, the average thickness is only 3mm, and the local thickness is less than 1 mm.
2) And (5) leakage is performed for multiple times, and temporary processing is performed by multiple card punching sub-units.
3) The coke oven stops production and smolders due to the post-treatment of the leakage of the high-pressure ammonia water pipeline, and the production of the coke oven is influenced.
Aiming at the problems, the whole original 7-meter pipeline needs to be replaced by a new pipeline with a thicker pipe wall. However, in the construction of replacing the pipeline as a whole, the coke oven needs to be shut down for braising, which not only affects the normal production, but also increases the production cost.
Disclosure of Invention
The invention aims to provide a method for replacing a water outlet pipeline of a high-pressure ammonia water pump of a coke oven, which can quickly, safely and stably replace an outlet pipeline of the high-pressure ammonia water pump of the coke oven so as to achieve the aim of replacing the high-pressure ammonia water pipeline without stopping production.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for replacing the water outlet pipeline of high-pressure ammonia water pump for coke oven features that a new pipeline is pre-laid along the old pipeline, and the connection between said new pipeline and valve is performed by the repair time of coke oven.
The method comprises the following specific steps:
1) completely laying and installing the new pipeline along the laying route of the old pipeline to be replaced; paving strict asbestos around a part needing to be fired for dismantling an old pipeline, and preparing fire extinguishing equipment and a sand bag;
2) and (3) respectively carrying out joint operation of a new pipeline and a valve on the 1# coke oven, the 2# coke oven, the 3# coke oven and the 4# coke oven by utilizing the normal maintenance time of the coke ovens: when the 1# coke oven and the 2# coke oven are overhauled and the 3# coke oven and the 4# coke oven are normally produced, replacing outlet pipelines between the 1# coke oven and the 2# coke oven and the 1# high-pressure ammonia water pump; when the 3# coke oven and the 4# coke oven are overhauled and the 1# coke oven and the 2# coke oven are normally produced, replacing outlet pipelines between the 3# coke oven and the 4# coke oven and the 3# high-pressure ammonia water pump; the replacement steps of the outlet pipelines between the No. 1 coke oven, the No. 2 coke oven and the No. 1 high-pressure ammonia water pump are as follows:
a) stopping the No. 1 high-pressure ammonia water pump, and closing outlet valves B1, P1 and P2;
b) emptying the stored liquid in the old pipeline from an emptying valve E1, and introducing steam into the old pipeline from an emptying valve E1;
c) the old pipeline on the valve is disassembled, the old pipeline is integrally disassembled through gas welding or other cutting modes, and meanwhile, the joint operation between the new pipeline and the valve is carried out;
d) after all the joints are finished, performing a nitrogen pressurizing experiment, and after the experiment is finished, opening corresponding valves to gradually recover production;
3) the replacement of the outlet pipeline between the 3# coke oven, the 4# coke oven and the 3# high-pressure ammonia water pump is the same as the operation mode of the 1# and the 2# coke ovens.
Compared with the prior art, the invention has the beneficial effects that:
a method for replacing the water outlet pipeline of high-pressure ammonia water pump for coke oven features that a new pipeline is laid along the old pipeline in advance, the old pipeline is detached and the joint of new pipeline is used, and the joint of each pipeline is only needed 4 hr for quick, safe and stable replacement of high-pressure ammonia water pump outlet pipeline.
Drawings
FIG. 1 is a process diagram of a high pressure water pump outlet pipeline of a coke oven according to the present invention.
Detailed Description
The following embodiments are further illustrated by reference to the following specific examples:
referring to fig. 1, the dotted line represents the portion of the old pipe that needs to be replaced, and the solid line represents the new pipe.
A method for replacing the water outlet pipeline of high-pressure ammonia water pump for coke oven features that a new pipeline is pre-laid along the old pipeline, and the connection between said new pipeline and valve is performed by the repair time of coke oven.
The method comprises the following specific steps:
1) and completely laying the new pipeline along the laying route of the old pipeline to be replaced, and completely installing the control valves connected in the pipeline. Simultaneously, preparation work before contact is done: a) and pre-threading all flange bolts needing to be connected. b) Tight asbestos is laid around all the positions where fire is needed for dismantling the old pipeline, and enough fire extinguishing equipment and sand bags are prepared.
2) And respectively carrying out contact operation of a new pipeline and a valve P, B, E on the 1# coke oven, the 2# coke oven and the 3# coke oven and the 4# coke oven by utilizing the normal overhaul time of the coke ovens. As shown in FIG. 1, P1-4Is a control valve for controlling the flow of ammonia water entering 4 coke ovens, B1-3Control valves of three high-pressure ammonia pumps, E1-3Is a blow-down valve with three groups of pipelines, wherein E2 is standby equipment 2# high-pressure ammonia waterThe pump is connected with a blow-down valve of the pipeline. When the 1# coke oven and the 2# coke oven are overhauled and the 3# coke oven and the 4# coke oven are normally produced, replacing outlet pipelines between the 1# coke oven and the 2# coke oven and the 1# high-pressure ammonia water pump; when the 3# coke oven and the 4# coke oven are overhauled and the 1# coke oven and the 2# coke oven are normally produced, replacing outlet pipelines between the 3# coke oven and the 4# coke oven and the 3# high-pressure ammonia water pump; because 2# high-pressure ammonia water pump is standby equipment, is normally closed state during normal production, so the change of 2# high-pressure ammonia water pump outlet pipe can be changed simultaneously with 1# high-pressure ammonia water pump outlet pipe, also can change simultaneously with 3# high-pressure ammonia water pump outlet pipe.
The replacement steps of the outlet pipelines between the No. 1 coke oven, the No. 2 coke oven and the No. 1 high-pressure ammonia water pump are as follows:
a) the 1# high-pressure ammonia pump is shut down, and the outlet valves B1, P1 and P2 are closed.
b) The stored liquid in the old pipeline is discharged from a discharge valve E1, and steam is introduced into the old pipeline from a discharge valve E1.
Since ammonia is flammable and explosive, in order to prevent fire when the old pipeline is disassembled, the ammonia in the pipeline needs to be emptied. Meanwhile, the steam is introduced into the old pipeline, which is an effective measure for preventing fire.
If the 2# high-pressure ammonia water pump outlet pipeline is replaced at the same time, the ammonia water in the standby pipeline needs to be emptied from the emptying valve E2, and the valve M2 on the new pipeline is closed.
c) The old pipelines on the valves B1, B2, E1, E2, P1 and P2 are disassembled, the old pipelines are integrally disassembled through gas welding or other cutting modes, and meanwhile joint operation between the new pipelines and the valves B1, B2, E1, E2, P1 and P2 is carried out.
d) And (4) performing a nitrogen pressurizing experiment after all the joints are finished, and opening corresponding valves after the experiment is finished to gradually recover production.
3) The replacement of the outlet pipeline between the 3# coke oven, the 4# coke oven and the 3# high-pressure ammonia water pump is the same as the operation mode of the 1# and the 2# coke ovens. The method comprises the following specific steps:
a) the 3# high-pressure ammonia pump is shut down, and the outlet valves B3, P3 and P4 are closed.
b) The stored liquid in the old pipeline is discharged from a discharge valve E3, and steam is introduced into the old pipeline from a discharge valve E3.
c) The old pipelines on the valves B3, E3, P3 and P4 are disassembled, the old pipelines are integrally disassembled through gas welding or other cutting modes, and meanwhile joint operation between the new pipelines and the valves B3, E3, P3 and P4 is carried out.
d) And (4) performing a nitrogen pressurizing experiment after all the joints are finished, and opening corresponding valves after the experiment is finished to gradually recover production.
The thickness of the replaced pipeline wall is 10mm, so that the service life of the pipeline is effectively prolonged.
Claims (1)
1. A method for replacing a water outlet pipeline of a high-pressure ammonia water pump of a coke oven is characterized in that a new pipeline is laid in advance along the route of an old pipeline, and the contact operation of the new pipeline and a valve is respectively carried out by utilizing the maintenance time of the coke oven, so that the high-pressure ammonia water pipeline is replaced without stopping production; the method comprises the following specific steps:
1) completely laying and installing the new pipeline along the laying route of the old pipeline to be replaced; paving strict asbestos around a part needing to be fired for dismantling an old pipeline, and preparing fire extinguishing equipment and a sand bag;
2) and (3) respectively carrying out joint operation of a new pipeline and a valve on the 1# coke oven, the 2# coke oven, the 3# coke oven and the 4# coke oven by utilizing the normal maintenance time of the coke ovens: when the 1# coke oven and the 2# coke oven are overhauled and the 3# coke oven and the 4# coke oven are normally produced, replacing outlet pipelines between the 1# coke oven and the 2# coke oven and the 1# high-pressure ammonia water pump; when the 3# coke oven and the 4# coke oven are overhauled and the 1# coke oven and the 2# coke oven are normally produced, replacing outlet pipelines between the 3# coke oven and the 4# coke oven and the 3# high-pressure ammonia water pump; the replacement steps of the outlet pipelines between the No. 1 coke oven, the No. 2 coke oven and the No. 1 high-pressure ammonia water pump are as follows:
a) stopping the No. 1 high-pressure ammonia water pump, and closing outlet valves B1, P1 and P2; b1 is a control valve of a No. 1 high-pressure ammonia water pump, P1 is a control valve for controlling the flow of ammonia water entering a No. 1 coke oven, and P2 is a control valve for controlling the flow of ammonia water entering a No. 2 coke oven;
b) emptying the stored liquid in the old pipeline from an emptying valve E1, and introducing steam into the old pipeline from an emptying valve E1;
if the outlet pipeline of the 2# high-pressure ammonia water pump is replaced at the same time, the ammonia water in the standby pipeline is emptied from the emptying valve E2, and the valve M2 on the new pipeline is closed;
c) the method comprises the following steps of (1) disassembling an old pipeline on a valve, integrally disassembling the old pipeline through cutting, and simultaneously performing joint operation between a new pipeline and the valve;
d) after all the joints are finished, performing a nitrogen pressurizing experiment, and after the experiment is finished, opening corresponding valves to gradually recover production;
3) the replacement of the outlet pipeline between the 3# coke oven, the 4# coke oven and the 3# high-pressure ammonia water pump is the same as the operation mode of the 1# and the 2# coke ovens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610312365.7A CN107366780B (en) | 2016-05-12 | 2016-05-12 | Method for replacing water outlet pipeline of high-pressure ammonia water pump of coke oven |
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| CN201610312365.7A CN107366780B (en) | 2016-05-12 | 2016-05-12 | Method for replacing water outlet pipeline of high-pressure ammonia water pump of coke oven |
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| CN107366780A CN107366780A (en) | 2017-11-21 |
| CN107366780B true CN107366780B (en) | 2020-05-29 |
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| CN111363565B (en) * | 2020-04-01 | 2021-05-25 | 中冶焦耐(大连)工程技术有限公司 | Coking high-pressure ammonia water pressure control system and control method |
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| DE3933364A1 (en) * | 1989-10-06 | 1991-04-18 | Krupp Koppers Gmbh | METHOD AND DEVICE FOR HOT REPAIRING THE HEATING UNITS OF A COOKER BATTERY |
| CN202643634U (en) * | 2012-07-13 | 2013-01-02 | 莱芜钢铁集团有限公司 | Coke quenching pool device for sediment cleaning |
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