CN103031396A - Method for leakage detecting and handling of blast furnace soft water closed circulating cooling system - Google Patents
Method for leakage detecting and handling of blast furnace soft water closed circulating cooling system Download PDFInfo
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- CN103031396A CN103031396A CN2012102722022A CN201210272202A CN103031396A CN 103031396 A CN103031396 A CN 103031396A CN 2012102722022 A CN2012102722022 A CN 2012102722022A CN 201210272202 A CN201210272202 A CN 201210272202A CN 103031396 A CN103031396 A CN 103031396A
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Abstract
The invention provides a method for the leakage detecting and handling of a blast furnace soft water closed circulating cooling system. Through the liquid level difference variation of an expansion tank of a soft water system, the coal gas pressure direction in the expansion tank or a degassing tank can be detected, the phenomenon of bubbles or white turbidity is generated in water flow in a flap flowmeter on a cooling wall of the closed circulating cooling system; during the process that the pH value is continuously and slowly reduced, seepages of water stain and mirabilite can be judged to be generated on an eye plate of a blast furnace shell, so that the judgment shows that the cooling wall or an inner wall of a pipeline is damaged; the flap flowmeter is then utilized, the damage point location of a cooling wall water pipe is determined, and longitudinal treatment is carried out; and a pressure gauge installation pressing leakage detection method is utilized to determine the damage point location of the cooling water pipe, and the lateral treatment is carried out. By the method, the working efficiency is increased, the labor intensity is reduced, leakage points can be found out and treated in real time, and solid foundation is laid for the safety, success production and stable production of a blast furnace.
Description
Technical field
The present invention relates to leak detection test and disposal to blast furnace soft water closed circulation cooling system, the method is not only easy but also quick, accurate, has important practical reference value.
Background technology
After breakage appears in (cooling stave, the big or middle cover) in the blast furnace soft water closed circulation cooling system, usually the working pressure table is suppressed leak hunting method or the leak detection of some gas fire, determine whether the cooling stave in this cooling water pipeline has disrepair phenomenon, but because cooling stave, big or middle cover quantity are many, 700 cooling staves of namely having an appointment, be divided into 16 layers, cover big or middle has 60, the cooling stave water pipe has 180, jacket water pipe big or middle has 60,10,11 layers of cooling stave back pipe water-cooled tube have 43, always have the water-cooled tube that 283 need are suppressed; Under the normal condition of production, the working pressure table is suppressed leak hunting method or the leak detection of some coal gas pyrogenic process, 4 water tenders of minimum needs carry out simultaneously this and suppress the leak detection operation, every water-cooled tube is suppressed leak detection once needs approximately 10 minutes, body of heater soft water system cooling stave is suppressed (vertically) leak detection at every turn, all need all water-cooled tubes are suppressed leak detection 2 times one by one, confirm with this, investigate out the water-cooled tube that all leak, therefore minimum needs approximately just can be finished altogether in 5660 minutes; Above-mentioned two kinds of method leakage detections, labor intensive is many, and labour intensity is large, and the length that delays as can not in time finding leak source, causes the generation of the serious accidents such as the interior water inlet of stove hearth freeze-up; About the about 500ppm of blast furnace gas concentration, when personnel hunt leak, there is great potential safety hazard in addition; A large amount of soft water efflux, and cause waste, and former leak hunting technology needs 566 drainings, and a large amount of soft water efflux, and have affected the energy-saving and cost-reducing index of enterprise.
The advantage of technical characterstic of the present invention: 1) approximately needed 5 minutes can judge exactly three 2500m
3Leak in the large blast furnace soft water airtight circulating cooling system cooling wall breakage, yet utilize tensimeter to suppress leak detecting or survey coal gas, methods of printing, minimum needs of working hour approximately 5660 minutes have shortened nearly more than 5650 minutes, greatly improve working efficiency, reduced labour intensity.2) stopped the long-time coal gas zone operation of water tender, ensured safety in production; When personnel hunt leak, there is great potential safety hazard at 36.5 meters platforms of body of heater in blast furnace cooling stave leakage detection place.3) in time find the cooling staveleakage point, avoid intaking too much in the stove, cause the serious accidents such as stove cold, hearth freeze-up.4) stop a large amount of soft water and efflux, former leak hunting technology needs 566 drainings, causes waste, adopts the method to reduce ironmaking cost.
Summary of the invention
The object of the invention is to: the leak detection that provides and method of disposal, greatly improved working efficiency, reduced labour intensity, in time find leak source and dispose leak source, for safety, natural labor, the stable yields of blast furnace provides solid basis.
The object of the present invention is achieved like this: a kind of leak detection and method of disposal for blast furnace soft water closed circulation cooling system are divided into the Disposal Measures of hunting leak with mending-leakage:
Step 1 leak detection is judged:
1) the expansion drum liquid level of soft water system, normal range be at 3.1-3.4 rice, when being lower than 3.1 meters, namely needs frequent moisturizing, shows that water in the cooling stave bleeds in the stove, and blast furnace cooling stave exists damaged;
2) detect coal gas in the expansion drum of soft water system or the degassing vessel, show that the soft water pressure of upper shaft is lower than the interior gas pressure of upper shaft stove, coal gas is altered in the stove, and namely coal gas is altered by the cooling stave of breakage and entered in the soft water system, and cooling stave has breakage; Circulating pressure in this moment upper shaft cooling stave is at 0.20-0.22mPa, and in the stove upper shaft gas pressure at 0.23-0.24mPa;
3) the soft water airtight circulating cooling system cooling stave is vertical 16 layers, establishes 45 cooling staves for horizontal every layer, establishes 4 water-cooled tubes in the every cooling stave, and 180 water-cooled tubes are arranged altogether; Adopt 180 turnover panel under meter Real-Time Monitorings, the current in the turnover panel under meter have bubble or gonorrhoea, show that the cooling stave that cooling stave vertically comprises this cooling water pipeline has breakage;
4) soft water check pH normal value when the pH value is continued slowly to reduce by 9.2 ↘, 8.9 ↘, 8.1 ↘ 7.5, determines namely that coal gas is scurried in the soft water system in the stove at 8-10, carbonic acid gas in the coal gas dissolves in the water, form carbonic acid and be slightly acidic, cause the reduction of pH value, show that cooling stave has breakage;
5) observe the exudate that the shell of blast furnace eye slab has water mark, saltcake, namely determine to enter the interior water of stove and taken out of by coal gas, carrying the grouting material of stove intracutaneous secretly, namely reveal coal gas point water seepage mark, saltcake at the stove skin, show that cooling stave has breakage;
Step 1 leak detection is disposed:
Vertically dispose: observe the turnover panel under meter on every cooling stave water outlet of the 16th layer of cooling stave water-cooled tube, determine that the position of cooling stave water pipe is damaged, namely implement to dispose;
Laterally dispose: its 1 use setting pressure table is suppressed leak hunting method, namely successively closes T-valve, and which layer cooling stave has the pressure of rushing down phenomenon, illustrates that then which layer cooling stave water-cooled tube has disrepair phenomenon; It 2 closes this root water-cooled tube Inlet and outlet water valve, observes water level in this root water-cooled tube and leaks to which layer and stop to descend, and illustrates that then which layer cooling stave water-cooled tube has disrepair phenomenon; Namely implement to dispose.
Leak detection in the large blast furnace of turnover panel under meter is arranged on the suitable SWR road of described method.
The present invention is by observing soft water system expansion drum liquid level change and detecting the gas concentration in the soft water system degassing vessel and observe streamflow regime in the turnover panel under meter on the SWR road, and the variation tendency of binding analysis water pH value, whether have the exudates such as water mark, saltcake, judge with this whether the blast furnace soft water closed circulation cooling system cooling stave is damaged if observing the shell of blast furnace eye slab; Recycling turnover panel under meter leak detecting, utilize the method that leak detector valve is successively investigated of installing, final determine this root water-cooled tube is at which layer cooling stave occur leaking (laterally), thereby determine that concrete which layer (laterally) which root (vertically) cooling stave leaks, in order to process rapidly, avoid affecting blast furnace and normally produce, show technical progress.
Embodiment
The present invention is described further in conjunction with the embodiments
Embodiment
The leak detection step:
When 1) normally producing, the expansion drum liquid level of soft water system maintains 3.1 meters, more stable, unless during water plant cleaning soft water glass, just fluctuating up and down can appear in the expansion drum liquid level of soft water system, surely do not live if find soft water system expansion drum liquid level, continuous decrease, such as liquid level from 3.0 meters of 3.4 Mi ↘, 3.2 Mi ↘, 3.1 Mi ↘ ..., illustrating that water in the soft water system cooling stave bleeds in the stove, there is disrepair phenomenon in blast furnace cooling stave.
2) hydraulic pressure in the upper shaft cooling stave (about 0.22MPa) is lower than gas pressure in the stove (about 0.24MPa), show that coal gas is scurried in the soft water system in the stove, be that coal gas will collect in the expansion drum or degassing vessel of soft water system, judge by the gas concentration that detects in the soft water system degassing vessel: if there is not coal gas in the degassing vessel, illustrate that then the soft water system cooling stave is normal, there is not disrepair phenomenon, if there is coal gas in the degassing vessel, illustrate that then cooling stave has disrepair phenomenon in the soft water system, leak in existing.
3) (blast furnace is on the 16th floor cooling stave SWR road by the turnover panel under meter on the observation SWR road, 180 turnover panel under meters are arranged altogether) in streamflow regime judge: if flowing water is transparent, then this cooling line is normal, if the current in the turnover panel under meter have bubble or gonorrhoea phenomenon, the cooling stave that then comprises this cooling water pipeline has disrepair phenomenon;
4) analyze the soft water result of laboratory test, under normal circumstances in the soft water form, the pH value stabilization is at (between the required standard value 8-10) about 9.2, the pH value occurring continues slowly to reduce, get rid of soft water system and change in a large number water or a large amount of moisturizing (abnormal cause, a large amount of soft water leak) factor outside, illustrate that then cooling stave has disrepair phenomenon in the soft water system, leak in existing, because coal gas is scurried in the soft water system in the stove, carbonic acid gas in the coal gas dissolves in the water, chemical reaction formation carbonic acid occurs be slightly acidic, thereby cause the pH value of soft water to reduce.Determine that with this cooling stave in cooling line has disrepair phenomenon.
5) observe the shell of blast furnace eye slab whether the exudates such as water mark, saltcake are arranged.The shell of blast furnace in zone has and reveals coal gas point (such as cooling stave corrugated tube, cooling stave screw sealing cover etc.) if leak, and the water that then enters in the stove can be taken out of by coal gas, reveal the coal gas point at the stove skin and the exudates such as water mark, saltcake occur.
Row is leaked step:
Determined that by above method the soft water system cooling stave has disrepair phenomenon, leak in existing, utilize the turnover panel under meter leak detecting (180 turnover panel under meters are arranged altogether) of observing on every cooling stave water outlet of the 16th layer of cooling stave water-cooled tube, can determine which root cooling stave water pipe damaged (180 water-cooled tubes are arranged altogether), namely vertical;
Utilize the method that leak detector valve is successively investigated of installing.Determine this root water-cooled tube at which layer cooling stave occurs leaking, namely horizontal;
1) adopt tensimeter to suppress leak hunting method: to close this root water-cooled tube inlet valve of the 1st layer of cooling stave, setting pressure table on the leak detector valve on this root cooling stave water inlet water-cooled tube of the 1st layer of cooling stave, since the 16th layer of cooling stave, successively close T-valve, which layer cooling stave has the pressure of rushing down phenomenon, illustrates that then which layer cooling stave water-cooled tube has disrepair phenomenon.
2) close this root water-cooled tube Inlet and outlet water valve, which layer observes water level in this root water-cooled tube leaks to and stops to descend, illustrate that then which layer cooling stave water-cooled tube has disrepair phenomenon, but in order to prevent cooling stave because cutting off the water supply by scaling loss, this leak hunting method adopts when being only suitable for blast furnace staying.
By aforesaid method, can judge accurately that concrete which layer (laterally) which root (vertically) cooling stave leaks so as to decompose rapidly, throw off, independent maintenance processing, avoid affecting blast furnace and normally produce.
Exemplify production operation:
On January 3rd, 2012 rose, according to the variation tendency of pH value in the water quality form: from 9.2 ↘, 8.9 ↘, 8.1 ↘ 7.5; Coal gas appears in the soft water system degassing vessel; The current of observing in the turnover panel under meter of finding on the 132# cooling stave water-cooled tube SWR road have obvious bubble or gonorrhoea phenomenon; The exudates such as water mark, saltcake appear in the stove skin leakage coal gas point that the 132# cooling stave leaks regional; Judging exactly blast furnace 132# cooling stave water-cooled tube (vertically) during damping down on the 13rd in January, 2012 leaks; Utilized the time of surely stopping to determine that the 15th section cooling stave 132# water-cooled tube is damaged on March 28th, 2012; Namely disconnect the 15th section cooling stave 132# water-cooled tube and carry out the maintenance processing with low-pressure industrial water separately, other 1-14 layer cooling staves of connecting, 14-16 layer cooling stave 132# water-cooled tube continues the soft water circulating cooling, guarantees the blast furnace cooling system normal cooling.
Claims (2)
1. leak detection and method of disposal that is used for blast furnace soft water closed circulation cooling system is characterized in that: the Disposal Measures that is divided into leak detection and mending-leakage:
Step 1 leak detection is judged:
1) the expansion drum liquid level of soft water system, normal range be at 3.1-3.4 rice, when being lower than 3.1 meters, namely needs frequent moisturizing, shows that water in the cooling stave bleeds in the stove, and blast furnace cooling stave exists damaged;
2) detect coal gas in the expansion drum of soft water system or the degassing vessel, show that the soft water pressure of upper shaft is lower than the interior gas pressure of upper shaft stove, coal gas is altered in the stove, and namely coal gas is altered by the cooling stave of breakage and entered in the soft water system, and cooling stave has breakage; Circulating pressure in this moment upper shaft cooling stave is at 0.20-0.22mPa, and in the stove upper shaft gas pressure at 0.23-0.24mPa;
3) the soft water airtight circulating cooling system cooling stave is vertical 16 layers, establishes 45 cooling staves for horizontal every layer, establishes 4 water-cooled tubes in the every cooling stave, and 180 water-cooled tubes are arranged altogether; Adopt 180 turnover panel under meter Real-Time Monitorings, the current in the turnover panel under meter have bubble or gonorrhoea, show that the cooling stave that cooling stave vertically comprises this cooling water pipeline has breakage;
4) soft water check pH normal value when the pH value is continued slowly to reduce by 9.2 ↘, 8.9 ↘, 8.1 ↘ 7.5, determines namely that coal gas is scurried in the soft water system in the stove at 8-10, carbonic acid gas in the coal gas dissolves in the water, form carbonic acid and be slightly acidic, cause the reduction of pH value, show that cooling stave has breakage;
5) observe the exudate that the shell of blast furnace eye slab has water mark, saltcake, namely determine to enter the interior water of stove and taken out of by coal gas, carrying the grouting material of stove intracutaneous secretly, namely reveal coal gas point water seepage mark, saltcake at the stove skin, show that cooling stave has breakage;
Step 1 leak detection is disposed:
Vertically dispose: observe the turnover panel under meter on every cooling stave water outlet of the 16th layer of cooling stave water-cooled tube, determine that the position of cooling stave water pipe is damaged, namely implement to dispose;
Laterally dispose: its 1 use setting pressure table is suppressed leak hunting method, namely successively closes T-valve, and which layer cooling stave has the pressure of rushing down phenomenon, illustrates that then which layer cooling stave water-cooled tube has disrepair phenomenon; It 2 closes this root water-cooled tube Inlet and outlet water valve, observes water level in this root water-cooled tube and leaks to which layer and stop to descend, and illustrates that then which layer cooling stave water-cooled tube has disrepair phenomenon; Namely implement to dispose.
2. described method according to claim 1 is characterized in that: the leak detection in the large blast furnace of turnover panel under meter is arranged on the suitable SWR road of the method.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282462A (en) * | 2015-05-28 | 2017-01-04 | 宝山钢铁股份有限公司 | A kind of blast furnace sealed cooling system concentrates leakage detection apparatus and method |
| CN107858467A (en) * | 2017-11-10 | 2018-03-30 | 中冶赛迪上海工程技术有限公司 | A kind of blast-furnace cooled water leak hunting method and system |
| CN109321700A (en) * | 2017-07-31 | 2019-02-12 | 宝山钢铁股份有限公司 | A kind of blast furnace cooling wall breakage detection separation method |
| CN110184402A (en) * | 2018-07-14 | 2019-08-30 | 江阴兴澄特种钢铁有限公司 | A method of it is online quickly to determine the specific leak source of blast furnace cooling stave |
| CN111593152A (en) * | 2019-02-20 | 2020-08-28 | 新疆八一钢铁股份有限公司 | Method for rapidly detecting damaged blast furnace cooling wall |
| CN112964832A (en) * | 2021-02-07 | 2021-06-15 | 河钢股份有限公司承德分公司 | Pressure vessel gas sampling analysis system and control method |
| CN113528727A (en) * | 2021-07-30 | 2021-10-22 | 宝武集团鄂城钢铁有限公司 | Online quick leak detection method for blast furnace tuyere sleeve |
| CN114317942A (en) * | 2020-09-28 | 2022-04-12 | 上海梅山钢铁股份有限公司 | Method for judging and processing water leakage in hot galvanizing horizontal furnace |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282462A (en) * | 2015-05-28 | 2017-01-04 | 宝山钢铁股份有限公司 | A kind of blast furnace sealed cooling system concentrates leakage detection apparatus and method |
| CN109321700A (en) * | 2017-07-31 | 2019-02-12 | 宝山钢铁股份有限公司 | A kind of blast furnace cooling wall breakage detection separation method |
| CN109321700B (en) * | 2017-07-31 | 2020-11-17 | 宝山钢铁股份有限公司 | Blast furnace body cooling wall damage detection and separation method |
| CN107858467A (en) * | 2017-11-10 | 2018-03-30 | 中冶赛迪上海工程技术有限公司 | A kind of blast-furnace cooled water leak hunting method and system |
| CN110184402A (en) * | 2018-07-14 | 2019-08-30 | 江阴兴澄特种钢铁有限公司 | A method of it is online quickly to determine the specific leak source of blast furnace cooling stave |
| CN111593152A (en) * | 2019-02-20 | 2020-08-28 | 新疆八一钢铁股份有限公司 | Method for rapidly detecting damaged blast furnace cooling wall |
| CN114317942A (en) * | 2020-09-28 | 2022-04-12 | 上海梅山钢铁股份有限公司 | Method for judging and processing water leakage in hot galvanizing horizontal furnace |
| CN114317942B (en) * | 2020-09-28 | 2024-05-10 | 上海梅山钢铁股份有限公司 | Method for judging and treating water leakage in hot galvanizing horizontal furnace |
| CN112964832A (en) * | 2021-02-07 | 2021-06-15 | 河钢股份有限公司承德分公司 | Pressure vessel gas sampling analysis system and control method |
| CN113528727A (en) * | 2021-07-30 | 2021-10-22 | 宝武集团鄂城钢铁有限公司 | Online quick leak detection method for blast furnace tuyere sleeve |
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Application publication date: 20130410 |