CN109811100B - Flushing system and flushing method for blast furnace soft water pipeline - Google Patents
Flushing system and flushing method for blast furnace soft water pipeline Download PDFInfo
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- CN109811100B CN109811100B CN201910291998.8A CN201910291998A CN109811100B CN 109811100 B CN109811100 B CN 109811100B CN 201910291998 A CN201910291998 A CN 201910291998A CN 109811100 B CN109811100 B CN 109811100B
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Abstract
The invention discloses a flushing system of a blast furnace soft water pipeline, wherein a communicating pipe is additionally arranged between a soft water main water supply pipe and a main water return pipe; a blind plate is additionally arranged between the soft water main return pipe and the soft water supply pump set; the soft water supply pump set is additionally provided with a water supply pipe which is connected with a water outlet pipe of a refrigerant water tank and is communicated with the refrigerant water tank, so that the soft water main water supply pipe is communicated with a main water return pipe at the bottom position of the blast furnace; and a drain pipe I is additionally arranged between the rear part of the cooler and the refrigerant water tank of the main water return pipe. The invention also discloses a method for flushing the soft water pipeline of the blast furnace, which ensures the starting of the soft water pump by a method of leading water from the refrigerant water pool; the method of introducing normal pressure water before the secondary booster pump ensures the start of the secondary booster pump and finishes the washing of the whole main pipe and branch pipe; the back washing of the cooling wall is directly carried out through normal pressure water, the washing speed is high, the washing efficiency is improved, and the washing quality is good through pipe cutting inspection after the washing.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a method for flushing a soft water pipeline of a blast furnace.
Background
The soft water system of the blast furnace is a closed circulating system, and the soft water is used for cooling a water cooling pipe, a cooling wall, a belly pipe, a tuyere middle sleeve, a hot blast valve and a damping valve at the bottom of the blast furnace. The soft water is supplied to the bottom of the blast furnace by a soft water supply pump set and divided into two paths, one path is supplied to the furnace top by a furnace bottom water cooling pipe and a belly pipe, the other path is supplied to the furnace top by a cooling wall, the two paths of water converge to a furnace top soft water ring pipe at the furnace top and flow into a secondary pressurizing pump set, and are divided into two paths after pressurization, the other path is used for cooling a tuyere middle sleeve, the other path is used for cooling a hot blast valve and a damping valve, the two paths of water are converged and then enter a main water return pipeline, and then enter the soft water supply pump set for recycling after passing through a degassing tank, an expansion tank and a cooler, and a small amount of soft water consumed in the. Because the soft water system is not directly supplied with water by the water tank, the water replenishing flow of the water replenishing pump set is very small, and the soft water system is not economical to directly flush. Therefore, the soft water flushing needs to consider how to realize large-flow circular flushing by means of an external water source.
In blast furnace construction, the cooling wall piping usually lags behind the installation time of the main pipe, and the main pipe, the branch pipe and the equipment pipeline are washed, so the cooling wall should not participate in washing at first. And 94% of the soft water of the blast furnace flows through the cooling wall, and under the condition that the cooling wall does not participate in washing, the soft water pump group and the secondary pressurizing pump group in the soft water system can not work normally in practice, namely the soft water main pipe and the branch pipe are difficult to wash in advance. After the soft water main pipe and branch pipe are washed, if the cooling wall is washed according to the produced water supply mode, the washing water of the cooling wall can enter the cooling wall from bottom to top and then is converged into the washed main pipe and branch pipe. On the one hand, this method cannot ensure the effectiveness of the flushing of the stave cooler, and on the other hand, it also contaminates the already flushed manifolds and manifolds.
Through search, patent schemes are disclosed. As in the Chinese patent: application No.: 201711337221.8, publication date: in 2018, 5, 18 th, the invention discloses a back washing method of a blast furnace cooling wall, which can ensure the washing effect of the cooling wall, and does not influence washed soft water main pipes and branch pipes, but the patent does not relate to the washing method of the main pipes and the branch pipes, and washing water enters the cooling wall after entering a water supply ring pipe at the top of a furnace from a furnace bottom water cooling pipe.
As another example, the Chinese patent: application No.: 201711495352.9, publication date: in 2018, 6 and 22, the invention provides a method for supplementing water and independently discharging hot blast stove cooling water from a whole blast furnace soft water system, which relates to the flushing of the hot blast stove cooling water, but the water supplementing is after secondary pressurization, and the main purpose is to ensure that the cooling water of the hot blast stove can be normally used under the condition that a secondary pressurization pump is not started when the blast furnace is overhauled.
Disclosure of Invention
In order to solve the problems and ensure that the water source is sufficient when the pipeline is flushed in each stage and the flushed pipeline is not polluted when the pipeline is flushed, the invention provides a flushing system and a flushing method for a blast furnace soft water pipeline.
The specific technical scheme of the invention is as follows: a flushing system for blast furnace soft water pipeline comprises a soft water supply pump set, valves of a hot blast furnace, a secondary pressure pump, a cooling wall, a refrigerant pool, a main water supply pipe, a main water return pipe and a plurality of valves, wherein the main water supply pipe and the main water return pipe are respectively disconnected, and a communicating pipe is additionally arranged at the bottom of the blast furnace to connect the main water supply pipe and the main water return pipe; a blind plate is additionally arranged between the soft water main return pipe and the soft water supply pump set; the soft water supply pump set is additionally provided with a water supply pipe which is connected with a water outlet pipe of a refrigerant water tank and is communicated with the refrigerant water tank, so that the soft water main water supply pipe is communicated with a main water return pipe at the bottom position of the blast furnace; and a drain pipe I is additionally arranged between the rear part of the cooler and the refrigerant water tank of the main water return pipe.
Furthermore, the flushing system also comprises a normal-pressure water system; the communicating pipe is removed, a soft water main water supply pipe and a main water return pipe are respectively connected again, and a connecting pipe valve are additionally arranged in front of the normal-pressure water system and the secondary pressure pump; a drain pipe II and a drain valve are additionally arranged on a return water pipeline for cooling each valve of the hot blast stove and connected into a drain tank of a casting house; and the cooling wall water supply ring pipe is connected to a normal-pressure water return main pipe through an additionally arranged drain pipe and a drain valve.
Furthermore, the secondary booster pump is provided with a bypass pipe and a bypass pipe valve.
Further, the method for flushing the soft water pipeline of the blast furnace comprises the following steps:
1) flushing pipeline starting soft water pump set by drawing water from refrigerant water pool
The flushing water of the soft water system can be taken from a refrigerant water tank, and a blind plate is added in front of a soft water supply pump set on a main soft water return pipe; respectively disconnecting a soft water main water supply pipe and a main water return pipe, and additionally arranging a communicating pipe at the bottom position of the blast furnace to connect the main water supply pipe and the main water return pipe; the soft water supply pump set end is additionally provided with a water supply pipe which is connected with a water outlet pipe of the refrigerant water tank and is communicated with the refrigerant water tank; a drain pipe I is additionally arranged between the rear part of the cooler and the refrigerant water tank of the main water return pipe;
water is fed from a refrigerant water pool, a soft water supply pump set is started, and the water returns to the refrigerant water pool through a main water supply pipe, a communication pipe additionally arranged between a main water supply pipe and a main water return pipe, a main water return pipe and a drain pipe I additionally arranged;
2) pipeline flushing by starting secondary booster pump through water replenishing before secondary booster pump
Firstly, dismantling a communicating pipe between a soft water main water supply pipe and a main water return pipe, and respectively reconnecting the soft water main water supply pipe and the main water return pipe;
starting a soft water supply pump, wherein water enters a furnace top water supply ring pipe from a furnace bottom water cooling pipe and then enters a secondary pressurizing pump; as the pipe diameter of the pipeline of the furnace bottom water-cooling pipe is smaller, part of flushing water from the main water supply pipe is shunted to the normal-pressure water return main pipe through a drain pipe on the cooling wall water supply circular pipe;
then starting the normal pressure water supply pump set, leading the water to pass through a connecting pipe additionally arranged in front of the normal pressure water system and the secondary booster pump, and a pipeline for collecting the water sent by the soft water pump to the front of the secondary booster pump;
starting a secondary pressure pump, opening a drain valve connected to a water return pipeline cooled by each valve of the hot blast stove, and connecting flushing water to a nearby tapping site drainage tank through a drain pipe II;
3) back-flushing of stave by means of atmospheric pressure water
Closing valves among the secondary pressure pump, the furnace bottom water-cooling pipe and the furnace top water supply ring pipe, closing valves in front of and behind the tuyere middle sleeve and closing valves between the cooling wall water supply ring pipe and the main water supply pipe;
the opening degree of a valve behind a degassing tank of the main return water pipe is adjusted, a normal pressure water supply pump is started, water enters the cooling wall through a secondary pressure pump by-pass pipe through cooling pipes of valves of the hot blast stove and a furnace top water supply ring pipe, and is discharged into a normal pressure water return main pipe through a discharge pipe on the cooling wall water supply ring pipe.
Further, after the pipeline in the step 2) is washed clean, the opening of the drain valve is adjusted, water enters the furnace top main pipe, part of water flows into the secondary booster pump from the furnace top water supply ring pipe, and part of water returns to the refrigerant water pool from the main water return pipe.
Furthermore, the secondary pressure pump is provided with a bypass pipe and a bypass pipe valve, and when the secondary pressure pump is used, the bypass pipe valve is closed.
Compared with the prior art, the flushing system can ensure the starting of the soft water pump by a method of leading water from the refrigerant water tank; the method of introducing normal pressure water before the secondary booster pump ensures the start of the secondary booster pump and finishes the washing of the whole main pipe and branch pipe; the back washing of the cooling wall is directly carried out through normal pressure water, the washing speed is high, the washing efficiency is improved, and the washing quality is good through pipe cutting inspection after the washing.
Drawings
FIG. 1 is a schematic view of a water flush line from a chilled water basin;
FIG. 2 is a view showing a furnace tube flushing arrangement;
in the figure: 1. the blind plate, 2, delivery pipe, 3, drain pipe I, 4, communicating pipe, 5, refrigerant pond outlet pipe, 6, blow off pipe, 7, blowoff valve, 8, connecting pipe, 9, connecting pipe valve, 10, drain valve, 11, drain pipe II, 22, ordinary pressure water return water house steward.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples of the specification.
Example 1
As shown in fig. 1 and 2, a flushing system for blast furnace soft water pipeline comprises a soft water supply pump set, valves of a hot blast stove, a secondary pressure pump, a cooling wall, a refrigerant water tank, a main water supply pipe, a main water return pipe and a plurality of valves.
As shown in fig. 1, a soft water main water supply pipe and a main water return pipe are respectively disconnected, and a communicating pipe 4 is additionally arranged at the bottom position of the blast furnace to connect the main water supply pipe and the main water return pipe; a blind plate 1 is additionally arranged between the soft water main return pipe and the soft water supply pump group; the soft water supply pump set end is additionally provided with a water supply pipe 2, the water supply pipe 2 is connected with a refrigerant water tank water outlet pipe 5 and is communicated with the refrigerant water tank, so that the soft water main water supply pipe is communicated with a main water return pipe at the bottom position of the blast furnace; a drain pipe I3 is additionally arranged between the main water return pipe and the refrigerant water tank behind the cooler. When the water-saving device is used, the soft water pump is started, and water is returned to the refrigerant water tank through the main water supply pipe, the communication pipe 4 additionally arranged between the main water supply pipe and the main water return pipe, the main water return pipe and the additionally arranged drain pipe I3. Therefore, the soft water supply pump can be debugged, and the soft water main supply and the main return pipe from the pump room to the furnace can be circularly washed.
As shown in fig. 2, the flushing system also includes an atmospheric water system. The communicating pipe 4 is dismantled, and the soft water main water supply pipe and the main water return pipe are respectively connected again. A connecting pipe 8 and a connecting pipe valve 9 are additionally arranged in front of the normal-pressure water system and the secondary booster pump, so that when the normal-pressure water supply pump is started, water can be collected to a pipeline in front of the secondary booster pump through the connecting pipe 8 and the water delivered from the soft water pump, and the secondary booster pump can be normally used.
A water discharge pipe II11 and a water discharge valve 10 are additionally arranged on a water return pipeline for cooling each valve of the hot blast stove and connected into a tapping house water discharge tank; the cooling wall water supply ring pipe is connected to a normal pressure water return main pipe 22 through an additionally arranged drain pipe 6 and a drain valve 7.
The secondary pressure pump is provided with the bypass pipe and the bypass pipe valve, so that water can circulate when the secondary pressure pump is closed, and the subsequent back flushing of the cooling wall is realized.
The flushing system is matched with the flushing method of the soft water pipeline of the blast furnace, and the flushing method comprises the following steps:
1) flushing pipeline starting soft water pump set by drawing water from refrigerant water pool
The flushing water of the soft water system can be taken from a refrigerant water tank, and a blind plate 1 is added in front of a soft water supply pump set on a main soft water return pipe; respectively disconnecting a soft water main water supply pipe and a main water return pipe, and additionally arranging a communicating pipe 4 at the bottom position of the blast furnace to connect the main water supply pipe and the main water return pipe; a water supply pipe 2 is additionally arranged at the soft water supply pump set end, and the water supply pipe 2 is connected with a refrigerant water tank water outlet pipe 5 and is communicated with the refrigerant water tank; a drain pipe I3 is additionally arranged between the main water return pipe and the refrigerant pool behind the cooler;
when the water supply device is used, water is fed from the refrigerant water tank, the soft water supply pump set is started, and the water is returned to the refrigerant water tank through the main water supply pipe, the communication pipe 4 additionally arranged between the main water supply pipe and the main water return pipe, the main water return pipe and the drain pipe I3 additionally arranged. Therefore, the soft water supply pump can be debugged, and the soft water main supply and the main return pipe from the pump room to the furnace can be circularly washed.
Because the total water supply pipe that comes out from soft water supply pump package is walked from the underground gallery, goes out ground at blast furnace bottom position, and the total wet return of stove bottom cooling water advances same underground gallery at blast furnace bottom position, goes out ground before the cooler, therefore the position of communicating pipe 4 intercommunication is in the exit position of blast furnace bottom underground gallery, and two pipes are very close to in this position. In practice, the flushing of this step is the flushing of the pipes in the underground gallery, and for some pipes without an underground gallery, the pipes are buried directly, also called the flushing of buried pipes.
2) The secondary booster pump is started to flush the pipeline by replenishing water before the secondary booster pump
When the cooling wall is not washed, only water with flow less than 6% is supplied to the furnace top water supply ring pipe through the branch of the furnace bottom water-cooling pipe, and the secondary pressurization system can not be started normally because of no large-flow continuous water supply, and at the moment, water can be supplemented to the front of the secondary pressurization pump by means of normal pressure water, so that the main pipe and the branch pipe of the soft water system can be washed in advance.
Firstly, dismantling a communicating pipe 4 between a soft water main water supply pipe and a main water return pipe, and respectively reconnecting the soft water main water supply pipe and the main water return pipe;
starting a soft water supply pump, wherein water enters a furnace top water supply ring pipe from a furnace bottom water cooling pipe and then enters a secondary pressurizing pump; as the pipe diameter of the pipeline of the furnace bottom water-cooling pipe is smaller, part of flushing water from the main water supply pipe is shunted to the normal pressure water return main 22 through the drain pipe 6 on the cooling wall water supply ring pipe;
then starting the normal pressure water supply pump set, leading the water to pass through a connecting pipe 8 additionally arranged in front of the normal pressure water system and the secondary booster pump, and a pipeline which is used for collecting the water sent by the soft water pump to the front of the secondary booster pump;
starting a secondary pressure pump, opening a drain valve 10 connected to a water return pipeline cooled by each valve of the hot blast stove, and connecting flushing water to a nearby tapping hole drainage tank of a tapping house through a drain pipe II 11;
after the water flowing out of the water discharge pipe II11 is cleaned, namely the pipeline is washed clean, the opening degree of the water discharge valve 10 is adjusted, the water enters the furnace top main pipe, part of the water flows into the secondary booster pump from the furnace top water supply ring pipe, and part of the water returns to the refrigerant water pool from the main water return pipe.
3) Back-flushing of stave by means of atmospheric pressure water
Closing valves 14 and 16 among a secondary pressure pump, a furnace bottom water-cooling pipe and a furnace top water supply ring pipe, closing valves 17 and 18 in front of and behind a tuyere middle sleeve and a valve 12 among a cooling wall water supply ring pipe and a main water supply pipe;
the opening degree of a valve 21 behind a degassing tank of a main return water pipe is adjusted, a normal-pressure water supply pump is started, water enters a cooling wall through a bypass pipe of a secondary pressure pump (the bypass pipe is arranged in the design, when the secondary pressure pump runs, a valve of the bypass pipe is closed, when the valve of the secondary pressure pump is opened, water can directly pass through the bypass pipe), valve cooling pipes of the hot blast stove and a water supply ring pipe at the top of the stove, and is discharged to a normal-pressure water return main pipe 22 through a discharge pipe 6 on the water supply ring pipe of the cooling wall.
Example 2
Using the blast furnace soft water pipeline flushing system and method of embodiment 1, the method is implemented on Changjiang river iron and steel 1080m32500m blast furnace and steed main works33200m blast furnace3The flushing quality reaches the standard requirement through pipe cutting inspection after the flushing is finished within one week.
The foregoing description of the embodiments is provided to enable one of ordinary skill in the art to understand and apply the techniques herein, and it is to be understood that various modifications may be readily made to the embodiments, and that the general principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present disclosure is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present disclosure.
Claims (6)
1. A flushing system of blast furnace soft water pipeline comprises a soft water supply pump set, valves of a hot blast stove, a secondary booster pump, a cooling wall, a refrigerant pool, a main water supply pipe, a main water return pipe and a plurality of valves, and is characterized in that the soft water main water supply pipe and the main water return pipe are respectively disconnected, and a communicating pipe (4) is additionally arranged at the bottom position of the blast furnace to connect the main water supply pipe and the main water return pipe; a blind plate (1) is additionally arranged between the soft water main return pipe and the soft water supply pump set; the soft water supply pump set end is additionally provided with a water supply pipe (2), and the water supply pipe (2) is connected with a refrigerant water tank water outlet pipe (5) and is further communicated with the refrigerant water tank; a drain pipe I (3) is additionally arranged between the rear part of the cooler and the refrigerant water tank of the main water return pipe; water enters from the refrigerant pool, a soft water supply pump set is started, and the water returns to the refrigerant pool through a main water supply pipe, a communication pipe (4) additionally arranged between the main water supply pipe and a main water return pipe, a main water return pipe and a drain pipe I (3) additionally arranged.
2. The system of claim 1, further comprising a normal pressure water system; the communicating pipe (4) is removed, a soft water main water supply pipe and a main water return pipe are respectively connected again, and a connecting pipe (8) and a connecting pipe valve (9) are additionally arranged in front of the normal-pressure water system and the secondary pressure pump; a drain pipe II (11) and a drain valve (10) are additionally arranged on a return water pipeline for cooling each valve of the hot blast stove and connected into a drain tank of a casting house; the cooling wall water supply ring pipe is connected to a normal pressure water return main pipe (22) through a drain pipe (6) and a drain valve (7).
3. The system of claim 1, wherein the secondary booster pump includes a bypass pipe and a bypass valve.
4. A method for flushing a soft water pipeline of a blast furnace is characterized by comprising the following steps:
1) flushing pipeline starting soft water pump set by drawing water from refrigerant water pool
The flushing water of the soft water system can be taken from a refrigerant pool, and a blind plate (1) is added in front of a soft water supply pump set on a main soft water return pipe; respectively disconnecting a soft water main water supply pipe and a main water return pipe, and additionally arranging a communicating pipe (4) at the bottom position of the blast furnace to connect the main water supply pipe and the main water return pipe; a water supply pipe (2) is additionally arranged at the soft water supply pump set end, and the water supply pipe (2) is connected with a refrigerant water tank water outlet pipe (5) and is further communicated with the refrigerant water tank; a drain pipe I (3) is additionally arranged between the main water return pipe and the refrigerant water tank behind the cooler;
water is fed from a refrigerant pool, a soft water supply pump set is started, and the water returns to the refrigerant pool through a main water supply pipe, a communication pipe (4) additionally arranged between the main water supply pipe and a main water return pipe, a main water return pipe and a drain pipe I (3) additionally arranged;
2) pipeline flushing by starting secondary booster pump through water replenishing before secondary booster pump
Firstly, dismantling a communicating pipe (4) between a soft water main water supply pipe and a main water return pipe, and respectively reconnecting the soft water main water supply pipe and the main water return pipe;
starting a soft water supply pump, wherein water enters a furnace top water supply ring pipe from a furnace bottom water cooling pipe and then enters a secondary pressurizing pump; as the pipe diameter of the pipeline of the furnace bottom water-cooling pipe is smaller, part of flushing water from the main water supply pipe is shunted to the normal pressure water return main pipe (22) through a drain pipe (6) on the cooling wall water supply circular pipe;
then starting the normal pressure water supply pump set, leading the water to pass through a connecting pipe (8) additionally arranged in front of the normal pressure water system and the secondary booster pump, and a pipeline which is arranged in front of the secondary booster pump and collects the water sent by the soft water pump;
starting a secondary pressure pump, opening a drain valve (10) connected to a water return pipeline for cooling each valve of the hot blast stove, and connecting flushing water to a nearby tapping site drain tank through a drain pipe II (11);
3) back-flushing of stave by means of atmospheric pressure water
Closing valves (14, 16) among a secondary pressure pump, a furnace bottom water-cooling pipe and a furnace top water supply ring pipe, closing valves (17, 18) in front of and behind a tuyere middle sleeve and a valve (12) between a cooling wall water supply ring pipe and a main water supply pipe;
the opening degree of a rear valve (21) of a degassing tank of the main return pipe is adjusted, a normal-pressure water supply pump is started, water enters the cooling wall through a bypass pipe of the secondary pressure pump through cooling pipes of valves of the hot blast stove and a water supply ring pipe at the top of the stove, and is discharged into a normal-pressure water return main pipe (22) through a discharge pipe (6) on the water supply ring pipe of the cooling wall.
5. The method for washing the soft water pipeline of the blast furnace as claimed in claim 4, wherein after the pipeline is washed clean in the step 2), the opening degree of the drain valve (10) is adjusted to allow water to enter the furnace top main pipe, a part of water flows into the secondary booster pump from the water supply loop pipe of the furnace top, and a part of water returns to the refrigerant pool from the main return pipe.
6. The method as claimed in claim 4, wherein the secondary booster pump is provided with a bypass pipe and a bypass pipe valve, and the bypass pipe valve is closed when the secondary booster pump is in use.
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| CN110566934B (en) * | 2019-09-26 | 2024-04-23 | 贵州电网有限责任公司 | Pipeline flushing device and flushing method for boiler water circulating pump cooling system |
| CN110923382A (en) * | 2019-11-22 | 2020-03-27 | 上海宝冶集团有限公司 | Flushing method for blast furnace pure water closed circulating water system |
| CN114480761B (en) * | 2021-12-17 | 2023-05-05 | 中国华冶科工集团有限公司 | Blast furnace soft water closed cycle cooling system and method |
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| KR20030053614A (en) * | 2001-12-22 | 2003-07-02 | 주식회사 포스코 | An apparatus for filtering cooling water for removing dust in gas of a blast furnace and a method for cleaning gas by using the same apparatus |
| CN201981217U (en) * | 2010-12-29 | 2011-09-21 | 北京京诚科林环保科技有限公司 | Circulating cooling water system of small blast-furnace tuyere sleeve |
| CN103421917B (en) * | 2013-08-15 | 2015-01-14 | 北京首钢国际工程技术有限公司 | Blast furnace soft water closed-recirculation cooling system |
| CN108048609A (en) * | 2017-12-14 | 2018-05-18 | 安徽马钢设备检修有限公司 | A kind of back-flushing method of blast furnace cooling wall |
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