CN111219994A - Oxygen-enriched combustion safety protection control method for heating furnace - Google Patents
Oxygen-enriched combustion safety protection control method for heating furnace Download PDFInfo
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- CN111219994A CN111219994A CN201911049725.9A CN201911049725A CN111219994A CN 111219994 A CN111219994 A CN 111219994A CN 201911049725 A CN201911049725 A CN 201911049725A CN 111219994 A CN111219994 A CN 111219994A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/04—Arrangements of indicators or alarms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0009—Monitoring the pressure in an enclosure or kiln zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D2021/0007—Monitoring the pressure
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- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
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Abstract
A heating furnace oxygen-enriched combustion safety protection control method comprises the following specific steps: the method comprises three-stage control, wherein the first-stage control is started firstly when the second-stage control is started, and the first-stage control and the second-stage control are started firstly when the third-stage control is started; the primary control is detection of an oxygen valve set self-protection system; the secondary control is linkage protection monitoring between the oxygen valve group and the oxygen-enriched combustion system of the heating furnace; the three-stage control is the self-interlocking protection of the heating furnace; compared with the prior art, the invention has the beneficial effects that: the invention ensures that the oxygen-enriched combustion technology can increase the productivity of the heating furnace and save coal gas, and the oxygen-enriched combustion system can safely and stably operate.
Description
Technical Field
The invention belongs to the technical field of oxygen-enriched combustion of metallurgical industrial furnaces, and particularly relates to a safety protection control method for oxygen-enriched combustion of a heating furnace.
Background
The oxygen-enriched combustion is characterized in that the oxygen content in the combustion improver is more than 21 percent until pure oxygen is obtained, and a great amount of heat loss caused by 79 percent of nitrogen in air during combustion is reduced. The oxygen-enriched combustion technology has the advantages of saving coal gas, increasing productivity, improving billet heating uniformity, reducing NOx and C0 in the actual production of the heating furnace2The discharge amount and the like of the oxygen lance type oxygen-enriched combustion technology are researched and applied in domestic steel rolling heating furnaces at present.
For the oxygen-enriched combustion system of the steel rolling heating furnace, oxygen with higher concentration or pure oxygen is used as a combustion improver for fuel combustion, and a proper amount of oxygen is supplied to the heating furnace, so that the oxygen supply system can safely supply the oxygen to a hearth and ensure the full combustion with fuel gas in the furnace; also relates to the safety protection control of the heating furnace when the heating furnace is stopped in case of accidents and is used for material waiting and rolling. Once a high concentration of oxygen enters the furnace hearth during furnace shutdown, there is a possibility that deflagration of unburnt fuel will occur even if the fuel switch is closed. Therefore, the safety protection system of the oxygen-enriched combustion system is extremely important in the safe production of the heating furnace.
At present, people at home and abroad research on a safety protection method of an oxygen-enriched combustion system, for example, CN105042632A is a safety protection control device and method for an oxygen-enriched combustion system boiler, and the patent document proposes to monitor two types of signals, one type is an operation state of important auxiliary equipment of the oxygen-enriched combustion system boiler, and the other type is a real-time signal such as oxygen concentration, pressure, temperature and the like at an oxygen injection position of the combustion system, so that the safety operation of the oxygen-enriched combustion system of the boiler can be ensured.
Patent document No. CN 105042630A: oxygen supply control device and method for oxygen-enriched combustion system. The method can quickly and uniformly mix high-concentration oxygen or pure oxygen with the recirculated flue gas according to the proportion required by boiler combustion, and the method is only suitable for oxygen supply control of the oxygen-enriched combustion system after flue gas in the boiler is recovered.
The oxygen-enriched combustion of the heating furnace mainly comprises oxygen gun type oxygen-enriched combustion and pure oxygen-enriched combustion. None of the above patent documents relates to a safety protection control method for an oxygen lance type oxygen-enriched combustion system of a heating furnace. Compared with the oxygen lance type oxygen-enriched combustion of a boiler, the oxygen lance type heating furnace oxygen-enriched combustion system has more complex working conditions and greater control difficulty. Besides the equipment accident state, the heating furnace also relates to the states of waiting for materials, waiting for rolling and the like.
Therefore, it is necessary to develop a safety protection control method for the oxycombustion system of the heating furnace to ensure the safe and stable operation of the oxycombustion system of the heating furnace.
Disclosure of Invention
The invention provides a heating furnace oxygen-enriched combustion safety protection control method, which controls the oxygen-enriched combustion state of a heating furnace through three-level linkage to ensure the safe and stable operation of an oxygen-enriched combustion system of the heating furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heating furnace oxygen-enriched combustion safety protection control method comprises the following specific steps:
the method comprises three-stage control, wherein the first-stage control is started firstly when the second-stage control is started, and the first-stage control and the second-stage control are started firstly when the third-stage control is started;
the primary control is detection of an oxygen valve group self-protection system: monitoring the oxygen pressure of a front main pipe of the oxygen valve bank and whether the opening and closing states of the valves are abnormal, and if the conditions are judged to be abnormal, automatically cutting off the oxygen valve bank;
the secondary control is linkage protection monitoring between the oxygen valve group and the oxygen-enriched combustion system of the heating furnace: monitoring the oxygen concentration, the oxygen flow, the oxygen pressure after decompression, the temperature of a hearth and the air-fuel ratio of the oxygen-enriched combustion system of the heating furnace, sending signals of the monitoring module to a control module, comparing the monitoring values of the oxygen concentration, the oxygen flow and the oxygen pressure after decompression and the temperature and the air-fuel ratio of the hearth with a cut-off set value by the control module, cutting off an oxygen valve group source by the cut-off module when any one of the conditions is greater than the cut-off set value, cutting off a cut-off valve at the inlet of each oxygen lance, cutting off the oxygen-enriched combustion system, and converting the heating furnace into a non-oxygen-;
the three-level control is the self-interlocking protection of the heating furnace: monitoring whether the running state of the vaporization system is abnormal, monitoring the material waiting state and the rolling state of the heating furnace, and monitoring the pressure of energy medium gas, air, nitrogen and cooling water; when the pressure of monitoring energy medium gas, air, nitrogen and cooling water is lower than a set alarm value, and the liquid level of a steam drum is lower than the set alarm value when the monitoring vaporization system is abnormal, the starting pressure difference of a vaporized diesel pump is not established in the alarm value, or when the material waiting and rolling waiting state of the heating furnace is 5-10 minutes, and any one of the conditions is established, the early warning module is started;
when the monitoring values of the pressure of the energy medium gas, air, nitrogen and cooling water are lower than a set cut-off value, or the liquid level of a steam drum is lower than the set cut-off value required during production, the starting pressure difference of the vaporized diesel pump is not established in the cut-off value, or the time of the material waiting state and the rolling state is longer than 10 minutes, when any one condition is met, the early warning module sends a signal to the cut-off module, the cut-off module firstly cuts off the oxygen source of the oxygen supply valve group, each oxygen lance inlet cut-off valve is closed, the oxygen-enriched combustion system is closed, then the combustion system of the heating furnace is cut off, the heating furnace stops heating, the gas valve is.
The first-level control comprises the following steps: monitoring whether the oxygen pressure of a front main pipe of the oxygen valve bank and the state of a valve switch are abnormal or not, comparing the monitored oxygen pressure with a set value, and automatically cutting off the oxygen valve bank when the oxygen pressure is greater than 0.8MPa or less than 2MPa and the state of the valve switch is abnormal.
The secondary control is as follows: the oxygen concentration of the oxygen-enriched combustion system of the heating furnace is monitored and controlled to be 21-65%, and the oxygen flow and the pressure of oxygen after pressure reduction are controlled to be 0-8000m3H and 0.4-0.5MPa, the temperature and the air-fuel ratio of the hearth are controlled at the upper limit of 1400 ℃ and the air-fuel ratio of 2.35-2.5, the monitoring module sends signals to the control module, and the control module sends the oxygen concentration, the oxygen flow, the oxygen pressure after pressure reduction and the temperature of the hearth to the control moduleAnd comparing the air-fuel ratio monitoring value with a cut-off set value, when the monitoring value is greater than the cut-off set value, if any one of the conditions occurs, the cut-off module cuts off the oxygen source of the oxygen valve group, each oxygen lance inlet cut-off valve is cut off, the oxygen-enriched combustion system is cut off, and the heating furnace is switched to a non-oxygen-enriched combustion state for production.
In the three-level control: monitoring the set alarm value of the steam drum liquid level of the vaporization system to be-100 mm, and the set cut-off value of the steam drum liquid level of the vaporization system to be-150 mm; the starting differential pressure alarm value of the vaporized diesel pump is 20 seconds, and the starting differential pressure cut-off value of the vaporized diesel pump is 30 seconds.
And after the heating of the purging module is stopped, the gas valve is automatically closed, the purging nitrogen valve is automatically opened, and the gas main pipe and the branch pipe are purged by nitrogen.
Compared with the prior art, the invention has the beneficial effects that:
the invention ensures that the oxygen-enriched combustion technology can increase the productivity of the heating furnace and save coal gas, and the oxygen-enriched combustion system can safely and stably operate.
Drawings
FIG. 1 is a process diagram of a heating furnace oxygen lance type oxygen-enriched combustion system.
FIG. 2 is a flow chart of the control of the oxygen-enriched combustion safety protection of the heating furnace.
In the figure: 1-oxygen pipeline, 2-oxygen valve group, 3-oxygen lance, 4-oxygen lance cut-off valve, 5-burner, 6-water beam, 7-heating furnace hearth, 8-smoke exhaust system and 9-vaporization system.
Detailed Description
The following examples are provided to further illustrate the embodiments of the present invention:
as shown in figure 1, the oxygen lance heating furnace oxygen-enriched combustion system can be put into use at any time according to production needs. When the oxygen-enriched combustion system of the heating furnace is put into operation, oxygen is conveyed to the oxygen valve group 2 from the oxygen pipeline 1 and is conveyed to each oxygen lance 3 from the oxygen valve group 2, and a cut-off valve 4 is arranged in front of each oxygen lance 3. The oxygen lance is arranged beside the burner 5 at the side of the heating furnace. When the temperature of the hearth of the heating furnace rises to 800-1000 ℃, the cut-off valve 4 of the oxygen lance is controlled to be opened, the oxygen lance 3 is started, and the oxygen concentration control system is used for controlling oxygen to be sprayed from the oxygen lance 3 to the hearth 7 of the heating furnace, so that oxygen-enriched combustion is realized. The cooling water in the water beam 6 in the furnace is heated and vaporized by the high-temperature flue gas in the furnace, the cooling water is sent to the vaporization system 9, the steam and the water are separated by a steam pocket in the vaporization system 9, the cooling water is used for circularly cooling the water beam 6, the generated steam is connected to the grid, and the flue gas after combustion is discharged through the smoke discharge system 8.
As can be seen from the graph 1, the control of the oxygen concentration and the hearth temperature under the oxygen-enriched combustion directly affects the operation state of the vaporization system, the danger is increased when the oxygen concentration and the hearth temperature are high, and the safety control of the oxygen-enriched combustion of the heating furnace is very important.
Referring to fig. 2, a method for controlling the oxygen-enriched combustion safety protection of a heating furnace specifically comprises the following steps:
the method comprises three-stage control, wherein the first-stage control is started firstly when the second-stage control is started, and the first-stage control and the second-stage control are started firstly when the third-stage control is started;
the primary control is detection of an oxygen valve group self-protection system: monitoring the oxygen pressure of a front main pipe of the oxygen valve bank and whether the opening and closing states of the valves are abnormal, and if the conditions are judged to be abnormal, automatically cutting off the oxygen valve bank;
the secondary control is linkage protection monitoring between the oxygen valve group and the oxygen-enriched combustion system of the heating furnace: monitoring the oxygen concentration, the oxygen flow, the oxygen pressure after decompression, the temperature of a hearth and the air-fuel ratio of the oxygen-enriched combustion system of the heating furnace, sending signals of the monitoring module to a control module, comparing the monitoring values of the oxygen concentration, the oxygen flow and the oxygen pressure after decompression and the temperature and the air-fuel ratio of the hearth with a cut-off set value by the control module, cutting off an oxygen valve group source by the cut-off module when any one of the conditions is greater than the cut-off set value, cutting off a cut-off valve at the inlet of each oxygen lance, cutting off the oxygen-enriched combustion system, and converting the heating furnace into a non-oxygen-;
the three-level control is the self-interlocking protection of the heating furnace: monitoring whether the running state of the vaporization system is abnormal, monitoring the material waiting state and the rolling state of the heating furnace, and monitoring the pressure of energy medium gas, air, nitrogen and cooling water; when the pressure of monitoring energy medium gas, air, nitrogen and cooling water is lower than a set alarm value, the running state of the vaporization system is abnormal, the liquid level of a steam drum in the abnormal monitoring vaporization system is lower than-100 mm, the differential pressure of the vaporization diesel pump is not established after 20 seconds of starting, or the time of the heating furnace in a waiting state and a waiting state is 5-10 minutes, any one condition is established, and the early warning module starts an early warning state;
when the monitoring values of the pressure of the energy medium gas, air, nitrogen and cooling water are lower than a set cut-off value, or the running state of the vaporization system is abnormal, the liquid level of a steam drum is lower than the lowest lower limit of-150 mm required during production, the differential pressure of the vaporization diesel pump is not established after starting for 30 seconds, or the time of the material waiting state and the material waiting state is longer than 10 minutes, any one condition is met, the early warning module sends a signal to the cut-off module, the cut-off module firstly cuts off the oxygen source of the oxygen supply valve group, each oxygen lance inlet cut-off valve is closed, the oxygen-enriched combustion system is closed, then the combustion system of the heating furnace is cut off, the heating furnace stops heating.
The first-level control comprises the following steps: monitoring whether the oxygen pressure of a front main pipe of the oxygen valve bank and the state of a valve switch are abnormal or not, comparing the monitored oxygen pressure with a set value, and automatically cutting off the oxygen valve bank when the oxygen pressure is greater than 0.8MPa or less than 2MPa and the state of the valve switch is abnormal.
The secondary control is as follows: the oxygen concentration of the oxygen-enriched combustion system of the heating furnace is monitored and controlled to be 21-65%, and the oxygen flow and the pressure of oxygen after pressure reduction are controlled to be 0-8000m3The furnace temperature and the air-fuel ratio are controlled to be 1400 ℃ at the upper limit and 2.35-2.5 MPa at the lower limit, a monitoring module signal is sent to a control module, the control module compares the oxygen concentration, the oxygen flow and the reduced oxygen pressure, the furnace temperature and the air-fuel ratio monitoring value with a cut-off set value, when the monitoring value is larger than the cut-off set value, the cut-off module cuts off an oxygen source of an oxygen valve group, each oxygen lance inlet cut-off valve is cut off, an oxygen-enriched combustion system is cut off, and the heating furnace is switched to a non-oxygen-enriched combustion state for production.
And after the heating of the purging module is stopped, the gas valve is automatically closed, the purging nitrogen valve is automatically opened, and the gas main pipe and the branch pipe are purged by nitrogen.
Example 1: control method for high oxygen concentration or oxygen flow rate exceeding upper limit
In the embodiment, a hot rolling heating furnace is adopted, an oxygen-enriched combustion system is arranged in a heating section, and 16 side burners are matched with 16 oxygen guns in total. Using a calorific value of 2100Kcal/Nm3The mixed coal gas is used as fuel, oxygen-enriched combustion is adopted, the oxygen-enriched concentration is controlled to be 21-65%, and the oxygen flow is controlled to be 0-8000m3The range of/h.
By adopting the method, the oxygen-enriched combustion system is started when the temperature of the heating section I of the heating furnace reaches 800-1000 ℃. The monitoring module detects the oxygen concentration in the oxygen-enriched combustion system of the heating furnace, when the oxygen concentration is more than 65% in actual production or when the oxygen flow is more than 8000m3During the production process, the monitoring module sends a signal to the control module, the control module receives a signal that any one of the oxygen concentration or the oxygen flow is larger than a set value, the control module starts the cut-off module, the oxygen supply valve group 2 is cut off, the inlet valve 4 of each oxygen lance 3 is cut off at the same time, the oxygen-enriched combustion system of the heating furnace is cut off, and the system is switched to a non-oxygen-enriched combustion state for production. This is a secondary control, the primary control being initiated first.
Example 2: safety control of energy source medium pressure of heating furnace
By adopting the method, when the oxygen-enriched combustion system is started up by the heating furnace, whether the running state of the vaporization system of the self safety protection interlocking system of the heating furnace is abnormal or not is monitored, and the pressure values of the energy medium gas, the air, the nitrogen and the cooling water are monitored. When the pressure of the coal gas of the monitored energy medium is lower than 7KPa, the air pressure is lower than 7KPa, the nitrogen pressure is lower than 0.4MPa, and the cooling water pressure is lower than 0.25MPa, any one of the pressure is lower than the early warning value, the early warning module starts the early warning state.
When the gas pressure of a main pipe with monitoring values is lower than 5KPa, the air pressure is lower than 5KPa, the nitrogen pressure is lower than 0.3MPa, and all the values are lower than the cut-off values, the cut-off module is started, firstly, the oxygen source of the oxygen supply valve group 2 is cut off, the cut-off valve 4 at the inlet of each oxygen lance 3 is closed, the oxygen-enriched combustion system is closed, then, the combustion system of the heating furnace is cut off, the heating furnace stops heating, the gas valve is closed, and the system.
And the purging module is used for automatically closing the gas valve and automatically opening the purging nitrogen valve after heating is stopped, and performing nitrogen purging on the gas main pipe and the branch pipe.
The above is three-stage control, and the first-stage control and the second-stage control are started firstly.
Claims (5)
1. A heating furnace oxygen-enriched combustion safety protection control method is characterized by comprising the following steps:
the method comprises three-stage control, wherein the first-stage control is started firstly when the second-stage control is started, and the first-stage control and the second-stage control are started firstly when the third-stage control is started;
the primary control is detection of an oxygen valve group self-protection system: monitoring the oxygen pressure of a front main pipe of the oxygen valve bank and whether the opening and closing states of the valves are abnormal, and if the conditions are judged to be abnormal, automatically cutting off the oxygen valve bank;
the secondary control is linkage protection monitoring between the oxygen valve group and the oxygen-enriched combustion system of the heating furnace: monitoring the oxygen concentration, the oxygen flow, the oxygen pressure after decompression, the temperature of a hearth and the air-fuel ratio of the oxygen-enriched combustion system of the heating furnace, sending signals of the monitoring module to a control module, comparing the monitoring values of the oxygen concentration, the oxygen flow and the oxygen pressure after decompression and the temperature and the air-fuel ratio of the hearth with a cut-off set value by the control module, cutting off an oxygen valve group source by the cut-off module when any one of the conditions is greater than the cut-off set value, cutting off a cut-off valve at the inlet of each oxygen lance, cutting off the oxygen-enriched combustion system, and converting the heating furnace into a non-oxygen-;
the three-level control is the self-interlocking protection of the heating furnace: monitoring whether the running state of the vaporization system is abnormal, monitoring the material waiting state and the rolling state of the heating furnace, and monitoring the pressure of energy medium gas, air, nitrogen and cooling water; when the pressure of monitoring energy medium gas, air, nitrogen and cooling water is lower than a set alarm value, and the liquid level of a steam drum is lower than the set alarm value when the monitoring vaporization system is abnormal, the starting pressure difference of a vaporized diesel pump is not established in the alarm value, or when the material waiting and rolling waiting state of the heating furnace is 5-10 minutes, and any one of the conditions is established, the early warning module is started;
when the monitoring values of the pressure of the energy medium gas, air, nitrogen and cooling water are lower than a set cut-off value, or the liquid level of a steam drum is lower than the set cut-off value required during production, the starting pressure difference of the vaporized diesel pump is not established in the cut-off value, or the time of the material waiting state and the rolling state is longer than 10 minutes, when any one condition is met, the early warning module sends a signal to the cut-off module, the cut-off module firstly cuts off the oxygen source of the oxygen supply valve group, each oxygen lance inlet cut-off valve is closed, the oxygen-enriched combustion system is closed, then the combustion system of the heating furnace is cut off, the heating furnace stops heating, the gas valve is.
2. The oxygen-enriched combustion safety protection control method for the heating furnace according to claim 1, characterized in that the primary control is as follows: monitoring whether the oxygen pressure of a front main pipe of the oxygen valve bank and the state of a valve switch are abnormal or not, comparing the monitored oxygen pressure with a set value, and automatically cutting off the oxygen valve bank when the oxygen pressure is greater than 0.8MPa or less than 2MPa and the state of the valve switch is abnormal.
3. The oxygen-enriched combustion safety protection control method for the heating furnace according to claim 1, wherein the secondary control comprises: the oxygen concentration of the oxygen-enriched combustion system of the heating furnace is monitored and controlled to be 21-65%, and the oxygen flow and the pressure of oxygen after pressure reduction are controlled to be 0-8000m3The furnace temperature and the air-fuel ratio are controlled to be 1400 ℃ at the upper limit and 2.35-2.5 MPa at the lower limit, a monitoring module signal is sent to a control module, the control module compares the oxygen concentration, the oxygen flow and the reduced oxygen pressure, the furnace temperature and the air-fuel ratio monitoring value with a cut-off set value, when the monitoring value is larger than the cut-off set value, the cut-off module cuts off an oxygen source of an oxygen valve group, each oxygen lance inlet cut-off valve is cut off, an oxygen-enriched combustion system is cut off, and the heating furnace is switched to a non-oxygen-enriched combustion state for production.
4. The oxygen-enriched combustion safety protection control method for the heating furnace according to claim 1, characterized in that in the three-level control: monitoring the set alarm value of the steam drum liquid level of the vaporization system to be-100 mm, and the set cut-off value of the steam drum liquid level of the vaporization system to be-150 mm; the starting differential pressure alarm value of the vaporized diesel pump is 20 seconds, and the starting differential pressure cut-off value of the vaporized diesel pump is 30 seconds.
5. The oxygen-enriched combustion safety protection control method for the heating furnace according to claim 1, wherein after the heating of the purging module is stopped, the gas valve is automatically closed, the purging nitrogen valve is automatically opened, and nitrogen purging is performed on the gas main pipe and the branch pipe.
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| CN112710161A (en) * | 2020-12-29 | 2021-04-27 | 马鞍山钢铁股份有限公司 | Pure oxygen combustion control system and control method of steel rolling heating furnace |
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