CN111593152A - Method for rapidly detecting damaged blast furnace cooling wall - Google Patents
Method for rapidly detecting damaged blast furnace cooling wall Download PDFInfo
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- CN111593152A CN111593152A CN201910125602.2A CN201910125602A CN111593152A CN 111593152 A CN111593152 A CN 111593152A CN 201910125602 A CN201910125602 A CN 201910125602A CN 111593152 A CN111593152 A CN 111593152A
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- water
- cooling wall
- soft water
- cooling
- blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
- C21B7/103—Detection of leakages of the cooling liquid
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The invention discloses a method for rapidly detecting the leakage of a damaged cooling wall of a blast furnace, which comprises the steps that when a pipeline of a soft water system outside a furnace body leaks water or the wall body and a water pipe of the cooling wall in the soft water system inside the furnace body are damaged and leak water into the furnace, the liquid level of an expansion tank is not stable and continuously drops, when the closed circulating cooling system of the soft water of the blast furnace is abnormal, the water quality index of the soft water in the period of time is detected, and the change trend of the PH value index is gradually reduced; when the cooling wall is damaged, gas can be detected in a degassing tank and an expansion tank of the soft water closed circulation cooling system, and the working condition of a flap flowmeter arranged on each soft water return pipeline of the cooling wall is observed under the normal production state of the blast furnace: when obvious bubbles and white turbidity phenomena exist in water flow in the flap flowmeter of the return water pipe of the cooling wall, the water pipe of the cooling wall is abnormal, and the longitudinal serial cooling wall comprising the cooling water pipe can be damaged.
Description
Technical Field
The invention relates to a method for quickly detecting the breakage of a cooling wall of a blast furnace.
Background
The cooling wall is important cooling equipment in blast furnace production, works under high temperature and severe conditions, and is easy to crack and leak water under the action of high-temperature alternating thermal stress. In order to avoid loss and even accidents caused by the fact that a large amount of water enters the blast furnace, the damage of the cooling wall needs to be quickly judged and detected, so that the cooling wall can be timely and properly treated, and the safety and normal production of the blast furnace are ensured. The main problems of the eight-steel company in the aspect of the blast furnace cooling wall damage leakage detection technology are as follows: (1) the damage of the cooling wall of the blast furnace is difficult to monitor and find, the time consumption for leakage detection is long, and the amount of water leaked into the furnace is large. (2) The methods for judging and detecting the damage of the cooling wall of the blast furnace are not uniform.
Disclosure of Invention
The invention aims to provide a method for quickly detecting the damage of a cooling wall of a blast furnace, which can conveniently, quickly and accurately judge and detect the damage of the cooling wall of a soft water closed circulating cooling system of the blast furnace, and can timely and properly treat the damage to ensure the safe production of the blast furnace.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for detecting the damaged quick leakage of the cooling wall of a blast furnace, 1) the abnormal condition of a blast furnace soft water closed circulation cooling system, when the pipeline of a furnace body external soft water system leaks water or the wall body and the water pipe of the cooling wall in the furnace body internal soft water system are damaged, when the water leaks into the furnace, the liquid level of an expansion tank is not stable and continuously descends, after the liquid level is normally supplemented, the liquid level continues to descend, and the N2 pressure in the expansion tank also correspondingly fluctuates regularly along with the liquid level of the expansion tank: when the liquid level is reduced, the pressure of N2 is correspondingly reduced along with the synchronization due to the increase of the volume; when the liquid level rises due to water supplement, the pressure of N2 correspondingly rises synchronously due to volume compression; 2) judging the change trend of the pH value in the soft water quality detection index: (1) under normal conditions, the PH value index in the blast furnace soft water quality test result is stabilized within the standard range of 8.0-10.0, and the fluctuation is small; (2) when the blast furnace soft water closed circulation cooling system is abnormal, detecting the water quality index of the soft water in the period of time, and gradually reducing the change trend of the PH value index; 3) and (3) detecting gas components in a degassing tank or an expansion tank of the soft water system: when the stave is damaged, can detect coal gas in soft water closed cycle cooling system's degasification jar, expansion tank, 3) observe turning over board flowmeter behavior, under the normal production state of blast furnace, observe the behavior of turning over board flowmeter of installation on every soft water return line of stave: when obvious bubbles and white turbidity phenomena exist in water flow in the flap flowmeter of the cooling wall water return pipe, the water pipe of the cooling wall is abnormal, and the longitudinal serial cooling wall comprising the cooling water pipe is possibly damaged; and checking and confirming that the phenomena of local overheating and large amount of soft water vaporization due to abnormal soft water circulation cooling of the water pipe of the cooling wall and leakage water outside the water pipe of the cooling wall are eliminated, in addition, the pressure gauge pressing method and the coal gas ignition method are combined for comprehensive judgment again, the damage phenomenon of the cooling wall can be confirmed, and the condition that the water flowing in the flap plate flowmeter in other cooling water pipes is clear and transparent indicates normal.
The invention determines the damaged cooling wall by the mutual influence relationship between the liquid level of the expansion tank in the blast furnace soft water closed circulation cooling system and the N2 pressure in the expansion tank, the change trend of the PH value in the soft water quality detection index, the gas composition in the degassing tank or the expansion tank of the soft water system, and the observation of the working condition of the flap flowmeter arranged on each soft water return pipeline of the cooling wall, and combines the comprehensive judgment of a pressure gauge pressurizing method, a gas ignition method and the like. The invention can quickly judge the damaged position of the cooling wall of the blast furnace, and timely and properly process the position, thereby ensuring the safe production of the blast furnace, being beneficial to the smooth operation, the stability and the long service life of the blast furnace, improving the operation rate of the blast furnace and reducing the production cost of the blast furnace.
Detailed Description
The present invention is further illustrated with reference to examples.
1) Judging the influence relationship between the liquid level of the expansion tank and the N2 pressure in the expansion tank:
(1) when the blast furnace soft water closed circulation cooling system is normal, the liquid level change of the expansion tank is consistent with the pressure change of N2 in the expansion tank. (2) When the water leaks into the furnace, the liquid level of the expansion tank is unstable and continuously drops, and the liquid level continues to drop after the liquid level is normally supplemented. The N2 pressure in the expansion tank also fluctuates regularly with the liquid level of the expansion tank accordingly: when the liquid level is reduced, the pressure of N2 is correspondingly reduced along with the synchronization due to the increase of the volume; when the liquid level rises, the pressure of N2 rises synchronously due to volume compression.
2) Judging the change trend of the pH value in the soft water quality detection index:
(1) under normal conditions, the PH value index in the blast furnace soft water quality test result is stabilized within the standard range of 8.0-10.0, and the fluctuation is small.
(2) When the blast furnace soft water closed circulation cooling system is abnormal, the water quality index of the soft water in the period is detected, and the change trend of the PH value index is decreased gradually. The reason is that when the cooling wall is broken, the gas in the furnace can flow back into the soft water, and CO2 in the gas can react with the water to form carbonic acid (H)2CO3) Resulting in a gradual decrease in the alkalinity of the soft water.
3) And (3) detecting gas components in a degassing tank or an expansion tank of the soft water system:
when the cooling wall is broken, gas can be detected in the degassing tank and the expansion tank of the soft water closed circulation cooling system. The reason is that when the water pressure in the stave is lower than the pressure of the gas in the furnace, if the stave leaks, the gas in the furnace will flow backward into the soft water, and the gas thus introduced will collect in the highest portion of the soft water system, i.e., the expansion tank or the degassing tank of the soft water system.
4) And (3) observing the working condition of the flap flowmeter, and comprehensively judging by combining a pressure gauge pressing method, a coal gas ignition method and the like:
under the normal production state of the blast furnace, the working condition of a flap flowmeter arranged on each soft water return pipeline of the cooling wall is observed: when obvious bubbles and white turbidity phenomena exist in water flow in the flap flowmeter of the return water pipe of the cooling wall, the water pipe of the cooling wall is abnormal, and the longitudinal serial cooling wall comprising the cooling water pipe can be damaged. Then, the inspection and confirmation are carried out to eliminate the phenomena of local overheating, large amount of soft water vaporization and leakage outside the water pipe of the cooling wall caused by abnormal soft water circulation cooling of the water pipe of the cooling wall. In addition, the cooling wall can be confirmed to be damaged by comprehensively judging again by combining a pressure gauge pressing method and a gas ignition method. And the clear and transparent water flowing in the flap flowmeter in other cooling water pipelines indicates normal.
The method can conveniently, quickly and accurately judge and find out the damage of the cooling wall of the blast furnace soft water closed circulating cooling system, and timely and properly process the damage, thereby ensuring the safe production of the blast furnace and being beneficial to the smooth operation, stability and long service life of the blast furnace.
Claims (1)
1. A method for detecting the damaged cooling wall of blast furnace quickly includes such steps as judging step by step that 1) the abnormal condition of the closed circulating cooling system of soft water in blast furnace is detected, when the pipeline of the external soft water system leaks water, or the wall and water pipe of cooling wall in the internal soft water system are damaged, and when water leaks into furnace, the liquid level of expansion tank is not stable and drops continuously, after the liquid level is compensated, it drops continuously, and the pressure of N2 in expansion tank fluctuates regularly with the liquid level of expansion tank: when the liquid level is reduced, the pressure of N2 is correspondingly reduced along with the synchronization due to the increase of the volume; when the liquid level rises due to water supplement, the pressure of N2 correspondingly rises synchronously due to volume compression; 2) judging the change trend of the pH value in the soft water quality detection index: (1) under normal conditions, the PH value index in the blast furnace soft water quality test result is stabilized within the standard range of 8.0-10.0, and the fluctuation is small; (2) when the blast furnace soft water closed circulation cooling system is abnormal, detecting the water quality index of the soft water in the period of time, and gradually reducing the change trend of the PH value index; 3) and (3) detecting gas components in a degassing tank or an expansion tank of the soft water system: when the stave is damaged, can detect coal gas in soft water closed cycle cooling system's degasification jar, expansion tank, 3) observe turning over board flowmeter behavior, under the normal production state of blast furnace, observe the behavior of turning over board flowmeter of installation on every soft water return line of stave: when obvious bubbles and white turbidity phenomena exist in water flow in the flap flowmeter of the cooling wall water return pipe, the water pipe of the cooling wall is abnormal, and the longitudinal serial cooling wall comprising the cooling water pipe is possibly damaged; and checking and confirming that the phenomena of local overheating and large amount of soft water vaporization due to abnormal soft water circulation cooling of the water pipe of the cooling wall and leakage water outside the water pipe of the cooling wall are eliminated, in addition, the pressure gauge pressing method and the coal gas ignition method are combined for comprehensive judgment again, the damage phenomenon of the cooling wall can be confirmed, and the condition that the water flowing in the flap plate flowmeter in other cooling water pipes is clear and transparent indicates normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125602.2A CN111593152A (en) | 2019-02-20 | 2019-02-20 | Method for rapidly detecting damaged blast furnace cooling wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125602.2A CN111593152A (en) | 2019-02-20 | 2019-02-20 | Method for rapidly detecting damaged blast furnace cooling wall |
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| CN111593152A true CN111593152A (en) | 2020-08-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113088594A (en) * | 2021-04-06 | 2021-07-09 | 攀钢集团攀枝花钢钒有限公司 | Leakage detection method for blast furnace soft water closed circulation cooling wall |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103031396A (en) * | 2012-08-02 | 2013-04-10 | 宝钢集团新疆八一钢铁有限公司 | Method for leakage detecting and handling of blast furnace soft water closed circulating cooling system |
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- 2019-02-20 CN CN201910125602.2A patent/CN111593152A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103031396A (en) * | 2012-08-02 | 2013-04-10 | 宝钢集团新疆八一钢铁有限公司 | Method for leakage detecting and handling of blast furnace soft water closed circulating cooling system |
Non-Patent Citations (1)
| Title |
|---|
| 任贵河等: "高炉软水密闭循环系统冷却壁破损检查", 《新疆钢铁》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113088594A (en) * | 2021-04-06 | 2021-07-09 | 攀钢集团攀枝花钢钒有限公司 | Leakage detection method for blast furnace soft water closed circulation cooling wall |
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Application publication date: 20200828 |