CN114317854A - Control method for oxygen-enriched blast in blast furnace ironmaking production - Google Patents
Control method for oxygen-enriched blast in blast furnace ironmaking production Download PDFInfo
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- CN114317854A CN114317854A CN202210130548.2A CN202210130548A CN114317854A CN 114317854 A CN114317854 A CN 114317854A CN 202210130548 A CN202210130548 A CN 202210130548A CN 114317854 A CN114317854 A CN 114317854A
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Abstract
The application provides a control method of oxygen-enriched air blast in blast furnace ironmaking production, under the condition that an air distributing device of cold air fails, when the pressure of the cold air at an outlet of an air blower is reduced to be less than or equal to 100KPa and when the flow of the cold air is reduced to be less than or equal to 100m3And in the time of/min, the stop valve of the industrial oxygen is automatically closed to stop inputting the industrial oxygen into the blast furnace, so that when the blast furnace is suddenly stopped or stopped, the automatic oxygen stop interlocking control is increased, the safety guarantee and the safety coefficient are improved, and the human errors are reduced. In the normal production process, when the pressure of the cold air is reduced to be less than or equal to 100KPa and the flow of the cold air is reduced to be less than or equal to 100m3And when one of the two conditions is met, the stop valve of the industrial oxygen is kept open and is not automatically closed, so that the industrial oxygen is normally input into the blast furnace, the mutual interlocking control of multiple conditions and multiple instruments is changed, and the accident that the oxygen is stopped mistakenly due to the fact that a single instrument has a problem is avoided.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a control method of oxygen-enriched blast in blast furnace ironmaking production.
Background
After the cold air sent out by the blower is heated to 800-1350 ℃ in the hot blast stove, the cold air continuously and stably enters the furnace hearth through the tuyere of the blast furnace, and the hot air burns coke in front of the tuyere to generate the red-hot reducing coal gas with the temperature of more than 2000 ℃. The high air temperature is an important technical characteristic of a modern blast furnace, and the improvement of the air temperature is a main technical measure for increasing the coal injection quantity, reducing the coke ratio and reducing the production cost. The blast furnace hot blast stove is one of main supporting equipment of iron works blast furnace, generally a blast furnace is furnished with 3 ~ 4 hot-blast stoves, and the effect of hot-blast stove is for the blast furnace is continuous provides the high temperature hot-blast of more than 1000 degrees. The advanced modern hot blast stove has the air temperature of 1300 ℃. The hot blast stove generally adopts blast furnace gas and coke oven gas as fuel.
The oxygen-enriched blast of blast furnace is a blast furnace intensified smelting technique, and is characterized by that in the blast furnace blast the industrial oxygen is added, so that the oxygen content of blast furnace is made to exceed that of atmospheric air (21%), and under the condition of that the air quantity and power consumption of blast furnace are not increased, the smelting strength can be raised to increase the yield of blast furnace and intensify combustion of injected fuel in the front of tuyere. A certain domestic blast furnace is subjected to a high oxygen enrichment large injection industrial test, the oxygen content of blast air reaches 28.59%, the coal injection amount is 170.02kg/t, the effect is very obvious, the oxygen is increased by 1% by the blast air, the yield of the blast furnace is increased by 2.5% -3%, and the coal injection amount can be increased by 12-13 kg/t. One is to add low-pressure oxygen from the suction inlet of the blower, and the other is to supply oxygen by high pressure, i.e. industrial oxygen is added into the blast furnace pipeline directly after being pressurized.
Blast furnace production is a continuous production process, no matter which equipment has problems in the middle, the blast furnace is forced to be downed, slowly blown or even stopped, especially, the damage of some important equipment can cause the blast furnace to be suddenly stopped, for example, equipment faults such as sudden air stop of a blower, blow pipe burnthrough and the like can be caused, and in the process, once operation is mistakenly carried out, extremely serious production accidents can be caused.
In the prior art, in the production of a blast furnace, clear safety linkage exists between industrial oxygen and cold air at an outlet of a blower, and the industrial oxygen can be automatically cut off when the pressure of the industrial oxygen is too low. However, in the prior art, the lack of reverse linkage between the industrial oxygen and the cold air causes vicious accidents such as explosion and the like once the oxygen is not stopped in time in the emergency blowing-down process of the blast furnace; and the display error of the instrument is easy to occur in winter with extremely low temperature, and the judgment error is easy to occur if the interlocking mode is controlled by only one instrument data.
Disclosure of Invention
The invention aims to provide a control method of oxygen-enriched blast in blast furnace iron-making production, which sets a corresponding linkage control method aiming at the condition that the blast furnace has emergent damping down or oxygen is not timely stopped in the damping down process, and simultaneously increases double insurance for the linkage of the control of a set corresponding single instrument.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a control method for oxygen-enriched blast in blast furnace iron-smelting production is characterized by that when the air-distributing device of cold air is failed, the pressure of cold air at outlet of air-blower is reduced to less than or equal to 100KPa and the flow rate of cold air at outlet of air-blower is reduced to less than or equal to 100m3And at the time of/min, the stop valve of the industrial oxygen is automatically closed to stop inputting the industrial oxygen into the blast furnace, and simultaneously, the coal injection system is controlled to stop injecting the coal powder into the blast furnace.
Preferably, in the normal production process, when the pressure of the cold air at the outlet of the blower is reduced to be less than or equal to 100KPa and the flow rate of the cold air at the outlet of the blower is reduced to be less than or equal to 100m3And when one of the two conditions is met, the industrial oxygen shut-off valve is opened and is not automatically closed, so that the industrial oxygen is normally input into the blast furnace.
Preferably, when (pressure of industrial oxygen-pressure of cold air at outlet of blower) is less than or equal to 50KPa, the shut-off valve of industrial oxygen is automatically closed to stop inputting industrial oxygen into the blast furnace.
Preferably, the concentration of the industrial oxygen is 95-99.8%, and the oxygen concentration of the oxygen-enriched air obtained by mixing cold air and the industrial oxygen is 23-29%.
The application obtains the following beneficial technical effects:
1) in the present application, when the air distributing device of the cool air is disabled (the air distributing device is not functional or the air distributing device is withdrawn), and when the pressure of the cool air at the outlet of the blower is reduced to be less than or equal to 100KPa and when the flow of the cool air at the outlet of the blower is reduced to be less than or equal to 100m3And in the time of/min, the stop valve of the industrial oxygen is automatically closed to stop inputting the industrial oxygen into the blast furnace, so that when the blast furnace is suddenly stopped or stopped, the automatic oxygen stop interlocking control during sudden stop or emergency stop is increased, the safety guarantee and the safety coefficient are mainly improved aiming at the emergency stop operation, and the human errors are reduced.
2) In the present application, during normal production, when the blower outlet is openThe pressure of the cold air is reduced to be less than or equal to 100KPa, and the flow of the cold air at the outlet of the blower is reduced to be less than or equal to 100m3When one or only one of the two conditions occurs,/min, the stop valve of the industrial oxygen is kept open and is not automatically closed so as to normally input the industrial oxygen into the blast furnace, the improvement becomes the mutual interlocking control of multiple conditions and multiple instruments, the interlocking defect of the control of a single instrument in the prior art is overcome, and the accident of mistakenly stopping oxygen due to the occurrence of the problem of the single instrument is avoided.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The application provides a control method of oxygen-enriched air blast in blast furnace ironmaking production, under the condition that an air distributing device of cold air is invalid (the air distributing device is not in effect or the air distributing device is withdrawn), when the pressure of the cold air at an outlet of an air blower is reduced to be less than or equal to 100KPa and when the flow of the cold air at the outlet of the air blower is reduced to be less than or equal to 100m3And at the time of/min, the stop valve of the industrial oxygen is automatically closed to stop inputting the industrial oxygen into the blast furnace, and simultaneously, the coal injection system is controlled to stop injecting the coal powder into the blast furnace.
In one embodiment of the present application, during normal production, when the pressure of the cool air at the outlet of the blower is reduced to 100KPa or less and the flow rate of the cool air at the outlet of the blower is reduced to 100m or less3And when one of the two conditions is met, the industrial oxygen shut-off valve is opened and is not automatically closed, so that the industrial oxygen is normally input into the blast furnace.
In one embodiment of the application, when (pressure of industrial oxygen-pressure of cold air at the outlet of the blower) is less than or equal to 50KPa, the shut-off valve of the industrial oxygen is automatically closed to stop the input of the industrial oxygen into the blast furnace.
In one embodiment of the present application, the industrial oxygen concentration is 95% to 99.8% (volume fraction), and the oxygen concentration of the oxygen-enriched air obtained by mixing the cold air with the industrial oxygen is 23% to 29% (volume fraction).
In the application, in the operation system of the blast furnace blower unit, a single-furnace operation mode is generally adopted; and once the operating blower fails, the standby blower is quickly started to continuously maintain the operation of the blast furnace. If the running blower system is suddenly stopped or stopped to supply air to the blast furnace due to faults, and the starting time of the standby blower is long (the starting time of a cold-state unit is 4-6h), the occurrence of serious accidents such as material setting of the blast furnace, slag filling of a tuyere and the like is caused, and huge loss is brought to the production of the blast furnace. If the standby unit is kept in the hot standby state for a long time in order to shorten the commissioning time of the standby unit, a series of negative effects and economic losses are brought, such as resource waste, environmental pollution caused by large amount of air discharge of the unit, equipment abrasion and the like. The air supply main pipe for communicating two blast furnaces is provided with an air distribution device, the air distribution device is a communication valve on a cold air pipeline for communicating the two blast furnaces, when one blast furnace is in an air cut but the other blast furnace is in a normal air supply state, the air distribution device is opened as a communication valve to supply air to the blast furnace in the air cut, the air distribution device can realize the distribution of the air quantity and the air pressure of each blast system, can prevent the blast furnace from being suddenly cut off when a running blast unit fails, and can avoid serious accidents such as blast furnace material setting, air port slag filling and the like.
In the application, the cut-off valve is one of execution mechanisms in an automatic system, consists of a multi-spring pneumatic membrane execution mechanism or a floating type piston execution mechanism and a regulating valve, receives a signal of a regulating instrument and controls the cut-off, the connection or the switching of fluid in a process pipeline; the device has the characteristics of simple structure, sensitive response, reliable action and the like; can be widely applied to industrial production departments such as petroleum, chemical industry, metallurgy and the like; the cut-off valve has wide application range and can be used for cutting off gas, combustion air, cold air, flue gas and the like; including ball valves, single seat valves, sleeve valves.
Methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
In order to further understand the present invention, the following will explain the method for controlling oxygen-rich blast in blast furnace ironmaking according to the present invention in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
Embodiment 1 provides a method for controlling oxygen-rich blast in blast furnace ironmaking, when a cold blast device fails (the cold blast device is not in operation or the cold blast device is withdrawn), when the pressure of cold blast at an outlet of a blower is reduced to 100KPa or less and when the flow of cold blast at the outlet of the blower is reduced to 100m or less3At the time of/min, the stop valve of the industrial oxygen is automatically closed to stop inputting the industrial oxygen into the blast furnace, and simultaneously the coal injection system is controlled to stop injecting the coal powder into the blast furnace;
the concentration of the industrial oxygen is 99 percent, and the oxygen concentration of the oxygen-enriched air obtained by mixing the cold air and the industrial oxygen is 28 percent.
Example 2
Embodiment 2 provides a method for controlling oxygen-rich blast in blast furnace ironmaking, when a cold blast device fails (the cold blast device is not in operation or the cold blast device is withdrawn), when the pressure of cold blast at an outlet of a blower is reduced to 100KPa or less and when the flow of cold blast at the outlet of the blower is reduced to 100m or less3At the time of/min, the stop valve of the industrial oxygen is automatically closed to stop inputting the industrial oxygen into the blast furnace, and simultaneously the coal injection system is controlled to stop injecting the coal powder into the blast furnace;
in the normal production process, when the pressure of the cold air at the outlet of the blower is reduced to be less than or equal to 100KPa and the flow of the cold air at the outlet of the blower is reduced to be less than or equal to 100m3When one or only one of the two conditions occurs,/min, the shut-off valve of the industrial oxygen is kept open and is not automatically closed so as to normally input the industrial oxygen into the blast furnace;
the concentration of the industrial oxygen is 99 percent, and the oxygen concentration of the oxygen-enriched air obtained by mixing the cold air and the industrial oxygen is 28 percent.
Example 3
Embodiment 3 provides a method for controlling oxygen-rich blast in blast furnace ironmaking, when a cold blast device fails (the cold blast device is not in operation or the cold blast device is withdrawn), when the pressure of cold blast at an outlet of a blower is reduced to 100KPa or less and when the flow rate of cold blast at the outlet of the blower is reduced to 100m or less3At the time of/min, the stop valve of the industrial oxygen is automatically closed to stop inputting the industrial oxygen into the blast furnace, and simultaneously the coal injection system is controlled to stop injecting the coal powder into the blast furnace;
in the normal production process, when the pressure of the cold air at the outlet of the blower is reduced to be less than or equal to 100KPa and the flow of the cold air at the outlet of the blower is reduced to be less than or equal to 100m3When one or only one of the two conditions occurs,/min, the shut-off valve of the industrial oxygen is kept open and is not automatically closed so as to normally input the industrial oxygen into the blast furnace;
when the pressure of the industrial oxygen-the pressure of the cold air at the outlet of the blower is less than or equal to 50KPa, the stop valve of the industrial oxygen is automatically closed to stop supplying the industrial oxygen;
the concentration of the industrial oxygen is 99 percent, and the oxygen concentration of the oxygen-enriched air obtained by mixing the cold air and the industrial oxygen is 28 percent.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (4)
1. A control method of oxygen-enriched blast in blast furnace ironmaking production is characterized in that when a cold blast air distributing device fails, the pressure of cold blast air at an outlet of a blast blower is reduced to be less than or equal to 100KPa, and the flow of cold blast air at the outlet of the blast blower is reduced to be less than or equal to 100m3And at the time of/min, the stop valve of the industrial oxygen is automatically closed to stop inputting the industrial oxygen into the blast furnace, and simultaneously, the coal injection system is controlled to stop injecting the coal powder into the blast furnace.
2. A method as claimed in claim 1, wherein during normal production, when the pressure of the cooling air at the outlet of the blower is reduced to 100KPa or less and the flow rate of the cooling air at the outlet of the blower is reduced to 100m or less3And when one of the two conditions is met, the industrial oxygen shut-off valve is opened and is not automatically closed, so that the industrial oxygen is normally input into the blast furnace.
3. A control method of oxygen-enriched blast in blast furnace ironmaking according to claim 1 or 2, characterized in that when (pressure of industrial oxygen-pressure of cold blast from the outlet of the blast furnace) is less than or equal to 50KPa, the shut-off valve of industrial oxygen is automatically closed to stop the supply of industrial oxygen to the blast furnace.
4. The method as claimed in claim 1, wherein the concentration of industrial oxygen is 95-99.8%, and the oxygen concentration of oxygen-enriched air obtained by mixing cold air with industrial oxygen is 23-29%.
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| CN202210130548.2A CN114317854A (en) | 2022-02-11 | 2022-02-11 | Control method for oxygen-enriched blast in blast furnace ironmaking production |
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| CN202210130548.2A CN114317854A (en) | 2022-02-11 | 2022-02-11 | Control method for oxygen-enriched blast in blast furnace ironmaking production |
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Citations (6)
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| GB833073A (en) * | 1956-09-13 | 1960-04-21 | United States Steel Corp | System for supplying oxygen to blast furnace tuyeres |
| CN202390455U (en) * | 2011-12-03 | 2012-08-22 | 云南泛亚能源科技有限公司 | Oxygen-enriched balancing device for blast furnace |
| CN204039422U (en) * | 2014-07-24 | 2014-12-24 | 首钢水城钢铁（集团）有限责任公司 | A kind of coal powder injection interlock control system |
| CN104694684A (en) * | 2015-02-28 | 2015-06-10 | 北京首钢自动化信息技术有限公司 | Blast furnace oxygen-rich rapid cut-off valve control system and method |
| CN105927575A (en) * | 2016-06-15 | 2016-09-07 | 江苏永钢集团有限公司 | Oxygen enriched air blast system in front of blast furnace blower |
| CN112410491A (en) * | 2020-12-08 | 2021-02-26 | 山东富伦钢铁有限公司 | Front oxygen-enriching device of blast furnace blower |
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2022
- 2022-02-11 CN CN202210130548.2A patent/CN114317854A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB833073A (en) * | 1956-09-13 | 1960-04-21 | United States Steel Corp | System for supplying oxygen to blast furnace tuyeres |
| CN202390455U (en) * | 2011-12-03 | 2012-08-22 | 云南泛亚能源科技有限公司 | Oxygen-enriched balancing device for blast furnace |
| CN204039422U (en) * | 2014-07-24 | 2014-12-24 | 首钢水城钢铁（集团）有限责任公司 | A kind of coal powder injection interlock control system |
| CN104694684A (en) * | 2015-02-28 | 2015-06-10 | 北京首钢自动化信息技术有限公司 | Blast furnace oxygen-rich rapid cut-off valve control system and method |
| CN105927575A (en) * | 2016-06-15 | 2016-09-07 | 江苏永钢集团有限公司 | Oxygen enriched air blast system in front of blast furnace blower |
| CN112410491A (en) * | 2020-12-08 | 2021-02-26 | 山东富伦钢铁有限公司 | Front oxygen-enriching device of blast furnace blower |
Non-Patent Citations (2)
| Title |
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| 傅燕乐: "《高炉操作》", 28 February 2006, 冶金工业出版社 * |
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Application publication date: 20220412 |