CN111411183A - Method for monitoring key valve position of hot blast stove gas system - Google Patents
Method for monitoring key valve position of hot blast stove gas system Download PDFInfo
- Publication number
- CN111411183A CN111411183A CN202010256585.9A CN202010256585A CN111411183A CN 111411183 A CN111411183 A CN 111411183A CN 202010256585 A CN202010256585 A CN 202010256585A CN 111411183 A CN111411183 A CN 111411183A
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- China
- Prior art keywords
- valve
- hot blast
- blast stove
- monitoring
- temperature
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
- C21B9/12—Hot-blast valves or slides for blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention relates to a method for monitoring key valve positions of a gas system of a hot blast stove, which comprises the following steps: monitoring and early warning the valve, connecting a temperature detection device and a pressure detection device arranged at the valve into a computer system of a blast furnace hot blast stove, and respectively setting alarm values; the actual valve position of the gas combustion valve and the bleeding valve between the valves can be indirectly monitored. The valve monitoring and alarming are realized through a series of monitoring means, and the safe operation of the equipment is ensured.
Description
Technical Field
The invention relates to the technical field of hot blast stove monitoring processes, in particular to a method for monitoring a key valve position of a gas system of a hot blast stove.
Background
The key valve position of the blast furnace hot blast stove gas system mainly comprises a gas combustion valve, a gas cut-off valve and an inter-valve bleeding valve. In the air supply process of the hot blast stove, the effective cut-off of a gas system and the inside of the hot blast stove (high temperature: 1000 ℃ and high pressure: 300Kpa) is ensured mainly by closing a gas combustion valve and a gas cut-off valve and opening a bleeding valve between the valves. The existing valve opening and closing are only related to the control system through the in-place signal. However, when the linkage of the valve and the valve body are failed, the in-position signal is also generated, but the valve is not in the in-position situation in fact. Once the gas combustion valve is not closed, hot air with the temperature of over 1000 ℃ flows through the gas combustion valve during air supply and enters a pipeline between the combustion valve and the stop valve, and if the bleed valve between the valves is in a normal actual open state, the hot air is discharged into the bleed pipe and is opposite to the air; if the bleeding valve between the valves is in an abnormal closing state (valve body), the bleeding valve possibly enters a low-pressure side gas cut-off valve (the blast furnace blowing air pressure is more than 300Kpa, and the gas pressure is less than or equal to 20Kpa), so that the gas is exploded, and the consequence is very serious.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for monitoring key valve positions of a hot blast furnace gas system, which realizes valve monitoring through a series of monitoring means and ensures the safe operation of equipment.
The technical purpose of the invention is realized by the following technical scheme: a method for monitoring key valve positions of a hot blast stove gas system comprises the following steps: monitoring and early warning the valve, connecting a temperature detection device and a pressure detection device arranged at the valve into a computer system of a blast furnace hot blast stove, and respectively setting alarm values; the actual valve position of the gas combustion valve and the bleeding valve between the valves can be indirectly monitored.
In one embodiment, the method for monitoring the key valve position of the hot blast furnace gas system further comprises the following steps: and (3) stopping stamping the hot blast stove, controlling the hot blast stove which is stamping to stop stamping immediately by the computer system of the blast furnace hot blast stove after the hot blast stove is not removed in the temperature and pressure alarm duration, switching the other hot blast stove which is burning to an air supply mode for supplying air, and switching the hot blast stove which is supplying air to a braising stove for rechecking.
In one embodiment, the temperature detection device is a temperature detector which is arranged on a pipeline between each hot blast stove gas combustion valve and the hot blast stove body; measuring range of the temperature detection meter: 0 to 700 ℃.
In one embodiment, the temperature detector alarm set values are: the temperature is 10-20 ℃ higher than the highest temperature of the preheated coal gas.
In one embodiment, the pressure detection device is a pressure detector, and the pressure detector is arranged in a bleeding valve between each two hot blast stove valves; pressure detection measurement range: 0 to 30 Kpa.
In one embodiment, the inter-valve bleed valve is disposed on the conduit between the combustion valve and the shut-off valve.
In one embodiment, the pressure detector alarm set values are: the pressure is 5-10 Kpa higher than the highest pressure of the gas pipe network.
In conclusion, the invention has the following beneficial effects:
firstly, whether a valve is closed in place can be monitored through a temperature and pressure monitoring device, if a rated numerical value is reached, an alarm is given, the alarm is not processed in time, the safety state is automatically selected, the hot blast stove supplies air, the hot blast stove with a fault is automatically switched into a safety mode state, and the safety is ensured;
secondly, the equipment investment is small, the installation is simple and convenient, the running state of the equipment can be monitored in real time, the occurrence of serious accidents such as gas explosion and the like is avoided, and the safe and stable running of the hot blast stove system is promoted.
Drawings
FIG. 1 is a schematic diagram of the control architecture of the present invention;
FIG. 2 is a schematic view showing the installation structure of the temperature detecting gauge and the pressure detecting gauge of the present invention.
In the figure: 1-hot blast stove, 2-combustion valve, 3-cut-off valve, 4-inter-valve bleeding valve, 5-pressure detector,
6-temperature detector.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
Referring to fig. 1, a method for monitoring a key valve position of a gas system of a hot blast stove comprises the following steps: monitoring and early warning the valve, connecting a temperature detection device and a pressure detection device arranged at the valve into a computer system of a blast furnace hot blast stove 1, and respectively setting alarm values; the actual valve positions of the gas combustion valve 2 and the inter-valve bleeding valve 4 are indirectly monitored, and if the actual valve positions exceed the numerical values, an alarm electrically connected with a computer system of the blast furnace hot blast stove 1 gives an alarm.
By adopting the scheme, the hot air near the valve is monitored by temperature and pressure, and because the temperature of the hot air passing through the combustion valve 2 is very high, if the temperature detection device detects high-temperature hot air, the combustion valve 2 is not closed tightly; and the pressure detection device can detect the wind pressure, and ensure the safety detection and the alarm of the bleeding valve 4 between the combustion valve 2 and the valve. And safety accidents are avoided.
The method for monitoring the key valve position of the hot blast stove 1 gas system further comprises the following steps: the hot blast stove 1 stops stamping, and after the hot blast stove is not removed in the temperature and pressure alarm duration, the computer system of the blast furnace hot blast stove controls the hot blast stove which is stamping to stop stamping immediately by controlling a stamping valve, and then switches the other hot blast stove which is burning into an air supply mode to supply air, and switches the hot blast stove which is supplying air into a braising stove to carry out rechecking; the valve can be further controlled after detection and alarm; the duration of the alarm is set according to the requirements of the site, such as 30-40 seconds.
Referring to fig. 2, the temperature detecting device is a temperature detector 6, and the temperature detector 6 is installed on a pipeline between the gas combustion valve 2 of each hot blast stove 1 and the body of the hot blast stove 1; measuring range of the temperature detector 6: 0 to 700 ℃.
In one embodiment, the alarm setting values of the temperature detector 6 are: the temperature is 10-20 ℃ higher than the highest temperature of the preheated coal gas.
In one embodiment, the pressure detection device is a pressure detector 5, and the pressure detector 5 is arranged in the blow-off valve 4 between each hot blast stove 1; pressure detector 5 range: 0 to 30 Kpa.
The inter-valve bleed valve 4 is arranged on a pipeline between the combustion valve 2 and the shut-off valve 3.
The pressure detector 5 has alarm setting values as follows: the pressure is 5-10 Kpa higher than the highest pressure of the gas pipe network.
The invention aims at the problem that in the actual production, the in-place signal can still be generated after the linkage of the connecting rod transmission mechanism of the valve and the valve body is failed, but the valve has the defect that the valve is not in place actually; the comprehensive technology of valve position signal-temperature-pressure confirmation is characterized in that a temperature detector 6 is arranged on a pipeline between a gas combustion valve 2 and a hot blast stove 1 body by combining the process principle of the hot blast stove 1, and a pressure detector 5 is arranged in front of an inter-valve diffusion valve 4 (in a pipeline between the gas combustion valve 2 and a gas stop valve 3). The gas pipeline behind the gas combustion valve 2 is directly communicated with a burner of the hot blast stove 1, in the air supply process of the hot blast stove 1, if the gas combustion valve 2 is not closed in place, the pipeline from the gas combustion valve 2 to the burner is changed into a circulating pipeline or even a hot air leakage pressure gap from the original blind end, and the detected temperature is greater than the highest temperature of the preheated gas by about 250 ℃ (the design parameter of a gas preheater device). If the temperature detection alarm is set, the operator can be reminded to immediately stop the stamping or air supply of the hot blast stove 1 and check the actual closing state of the gas combustion valve 2. The inter-valve bleeding valve 4 is normally in an open state in the air supply process, if the gas combustion valve 2 leaks, the valve body of the inter-valve bleeding valve 4 is in an abnormal close state, the pressure in the inter-valve bleeding valve 4 (in a pipeline between the combustion valve 2 and the cut-off valve 3) can rise to be more than 20Kpa (blast furnace air supply pressure is more than or equal to 300Kpa), if a pressure detection alarm is set, an operator can be reminded to stop stamping or air supply of the hot blast stove 1 immediately, and the actual close position of the gas combustion valve 2 and the actual open state of the inter-valve bleeding valve 4 are checked. The combustion valve 2, the cut-off valve 3 and the bleed valve 4 among the valves of the gas system are comprehensively confirmed through valve position signals, temperature and pressure, and the safe operation of the equipment is ensured.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. A method for monitoring a key valve position of a gas system of a hot blast stove is characterized by comprising the following steps: monitoring and early warning the valve, connecting a temperature detection device and a pressure detection device arranged at the valve into a computer system of a blast furnace hot blast stove, and respectively setting alarm values; the actual valve position of the gas combustion valve and the bleeding valve between the valves can be indirectly monitored.
2. The method of monitoring key valve positions in a hot blast furnace gas system of claim 1, further comprising: and (3) stopping stamping the hot blast stove, controlling the hot blast stove which is stamping to stop stamping immediately by the computer system of the blast furnace hot blast stove after the hot blast stove is not removed in the temperature and pressure alarm duration, switching the other hot blast stove which is burning to an air supply mode for supplying air, and switching the hot blast stove which is supplying air to a braising stove for rechecking.
3. The method for monitoring the key valve position of the hot-blast furnace gas system according to claim 1, wherein the temperature detecting device is a temperature detector, and the temperature detector is installed on a pipeline between each hot-blast furnace gas combustion valve and the hot-blast furnace body; measuring range of the temperature detection meter: 0 to 700 ℃.
4. The method for monitoring the key valve position of the hot blast furnace gas system according to claim 3, wherein the alarm setting values of the temperature detector are as follows: the temperature is 10-20 ℃ higher than the highest temperature of the preheated coal gas.
5. The method of claim 1, wherein the pressure detection device is a pressure detector installed in a blow-off valve between each blast furnace gas system valve; pressure detection measurement range: 0 to 30 Kpa.
6. The method of monitoring key valve positions in a hot blast furnace gas system of claim 5, wherein the inter-valve blow-off valve is disposed on a pipe between the combustion valve and the shut-off valve.
7. The method for monitoring the key valve position of the hot blast furnace gas system according to claim 5 or 6, wherein the pressure detector alarm setting values are as follows: the pressure is 5-10 Kpa higher than the highest pressure of the gas pipe network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010256585.9A CN111411183A (en) | 2020-04-02 | 2020-04-02 | Method for monitoring key valve position of hot blast stove gas system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010256585.9A CN111411183A (en) | 2020-04-02 | 2020-04-02 | Method for monitoring key valve position of hot blast stove gas system |
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| CN111411183A true CN111411183A (en) | 2020-07-14 |
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| CN202010256585.9A Pending CN111411183A (en) | 2020-04-02 | 2020-04-02 | Method for monitoring key valve position of hot blast stove gas system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040005470A (en) * | 2002-07-10 | 2004-01-16 | 주식회사 포스코 | Valve for controling flux of a hot air |
| CN101892338A (en) * | 2010-07-22 | 2010-11-24 | 首钢总公司 | Constant wind temperature control system for hot blast stove |
| CN106222346A (en) * | 2016-06-27 | 2016-12-14 | 南京南瑞继保电气有限公司 | A kind of blast furnace and hot blast cupola combustion optimal control method |
-
2020
- 2020-04-02 CN CN202010256585.9A patent/CN111411183A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040005470A (en) * | 2002-07-10 | 2004-01-16 | 주식회사 포스코 | Valve for controling flux of a hot air |
| CN101892338A (en) * | 2010-07-22 | 2010-11-24 | 首钢总公司 | Constant wind temperature control system for hot blast stove |
| CN106222346A (en) * | 2016-06-27 | 2016-12-14 | 南京南瑞继保电气有限公司 | A kind of blast furnace and hot blast cupola combustion optimal control method |
Non-Patent Citations (4)
| Title |
|---|
| 徐健余等: "7号高炉热风炉自动控制系统", 《江西能源》 * |
| 杨扬: "高炉热风炉系统的自动控制应用", 《包钢科技》 * |
| 王薇: "PKS控制系统在高炉喷吹站中的应用", 《科技信息(学术研究)》 * |
| 石建军: "热风阀监测系统整体设计", 《才智》 * |
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Application publication date: 20200714 |
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