JP2016194282A - Control method under blast furnace open ceiling in blast furnace gas-fired power generating installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a positive and stable prevention of occurrence of trip caused by rapid increasing of calorific power of blast furnace gas under blast furnace open ceiling at power generating installation with a steam generator including blast furnace gas as its fuel.SOLUTION: This invention relates to a control method under blast furnace open ceiling in blast furnace gas-fired power generating installation 1 comprising a boiler 10 for burning fuel containing blast furnace gas to generate steam, a steam turbine 12 for converting heat energy of steam generated at the boiler 10 into rotational energy and an electric generator 13 for converting rotational energy of a steam turbine 12 into electric power. Fuel flow rate supplied to the boiler 10 is decreased down to a predetermined and prescribed flow rate under open ceiling of the blast furnace and at the same time a controlled object of a governor valve 51 arranged at a main steam pipe 14 for supplying steam from the boiler 10 to the steam turbine 12 is set to a pressure value at the main steam pipe 14. Pressure controlling by the governor valve 51 against the main steam pipe 14 is performed in such a way that pressure at the main steam pipe 14 before blast furnace open ceiling, is maintained.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control method for stably operating a power generation facility even when a blow-through occurs in a blast furnace in a blast furnace gas-fired power generation facility using blast furnace gas obtained as a by-product gas from a blast furnace as a fuel. is there.

  Conventionally, in a steel mill, blast furnace gas (BFG) obtained as a by-product gas from a blast furnace is burned in a boiler, and power is generated by a steam turbine generator using high-temperature, high-pressure steam generated from the boiler, or gas Blast furnace gas is burned by a turbine combustor, and the generated combustion gas is used to generate power by a gas turbine generator, that is, blast furnace gas-fired power generation is performed.

  By the way, during the operation of the blast furnace, a phenomenon called so-called blow-through may occur. Blowing is a phenomenon in which a part of the ore layer in the blast furnace causes fluidization or channeling, and a large amount of gas reaches the top of the furnace with a large amount of sensible heat without heat exchange or reaction with the charge. When such a blow-through occurs, the calorie of the blast furnace gas, that is, the calorific value when used as fuel in the boiler increases. Therefore, when the flow rate of the blast furnace gas as the fuel supplied to the boiler is maintained before and after the blow-through, the total amount of heat generated by the fuel supplied to the boiler increases. If it does so, the load of a boiler will fluctuate and process values, such as furnace pressure, steam temperature, and steam pressure, will fluctuate rapidly and greatly in connection with it. As a result, a so-called boiler trip state may occur. And if it will be in a trip state, since supply of the electric power and steam from a blast furnace gas-fired power generation facility will stop, the bad influence given to the inside and outside of a steelworks in that case will become great. Specifically, when power transmission to each factory in the steelworks is stopped, it is necessary to stop the operation of each factory, or air supply from the power generation equipment to each factory in the steelworks is stopped. As a result, the operation at each location may be hindered.

  From the above viewpoint, in blast furnace gas-fired power generation, the amount of heat generated by the blast furnace gas supplied to the boiler is prevented from abruptly increasing when the blast furnace is blown through, and the adverse effect on the boiler due to the blow-through is minimized. It is strongly desired to keep it at a minimum.

  As a method for preventing the amount of heat generated by the blast furnace gas supplied to the boiler from rapidly increasing when the blast furnace is blown through, it has already been proposed in Patent Document 1 and the like.

  In Patent Document 1, the blast furnace gas calorific value is estimated from the temperature of the blast furnace gas, the calorific value is corrected based on the blast furnace gas temperature and pressure, and the blast furnace gas is introduced into the boiler based on the corrected blast furnace gas calorific value. There has been proposed an apparatus that controls a flow rate control valve provided in a passage to suppress fluctuations in the amount of heat of blast furnace gas supplied to a boiler.

Japanese Patent Publication No. 5-77926

  However, if the fuel flow rate is changed abruptly as in Patent Document 1, process values such as the pressure in the furnace of the boiler and the steam pressure are changed abruptly and significantly, and the boiler may trip. Therefore, even if the method of Patent Document 1 is applied to actual operation, it has been difficult to reliably and stably prevent a boiler trip when the blast furnace is blown through.

  The present invention has been made in view of the above points, and in a power generation facility using steam generated from a steam generator that generates steam using blast furnace gas as fuel, the amount of heat generated by the blast furnace gas at the time of occurrence of blow-through of the blast furnace is rapidly increased. The purpose is to reliably and stably prevent a trip from occurring due to a large increase.

  In order to achieve the above object, the present invention includes a steam generator that burns fuel containing blast furnace gas to generate steam, and a steam turbine that converts thermal energy of steam generated by the steam generator into rotational energy. And a generator for converting rotational energy of the steam turbine into electric power, and a control method at the time of blast furnace blow-off in a blast furnace gas-fired power generation facility, wherein a flow rate of fuel supplied to the steam generator at the time of blast furnace blow-off is determined in advance And a control object of a governor valve for controlling the amount of steam flowing into the steam turbine, provided in a main steam pipe for supplying steam from the steam generator to the steam turbine. The pressure of the main steam pipe is set to the pressure of the main steam pipe, and the pressure control of the main steam pipe by the governor valve maintains the pressure of the main steam pipe before the blast furnace blow-through. It is characterized in that performed so that.

  According to the present invention, at the time of blast furnace blow-through, the flow rate of fuel supplied to the steam generator is reduced to a predetermined flow rate, and the governor valve is controlled so that the pressure of the main steam pipe does not fluctuate before and after the blast furnace blow-through. Therefore, even if the amount of heat generated by the blast furnace gas fluctuates due to blast furnace blow-through, fluctuations in the amount of heat input to the steam generator and fluctuations in the pressure of the main steam pipe are kept to a minimum. Can be operated stably, and the operation of the power generation facility can be continued.

  The flow rate of the fuel supplied to the steam generator, which is decreased when the blast furnace blows through, may be determined so that the total calorific value of the fuel supplied to the steam generator does not fluctuate before and after the blast furnace blow-through.

  The steam generator is a boiler, and the fuel supplied to the steam generator includes a fuel gas containing the blast furnace gas, or a fuel gas containing at least one of coal or oil and the blast furnace gas, and the blast furnace blow-through Sometimes, the fuel whose flow rate of fuel supplied to the steam generator is reduced is a fuel gas containing the blast furnace gas when the fuel supplied to the steam generator is a fuel gas containing the blast furnace gas, When the fuel supplied to the steam generator includes at least one of the coal or the oil and the fuel gas containing the blast furnace gas, the fuel is at least one of the coal, the oil or the fuel gas containing the blast furnace gas, Also good.

  In a power generation facility using steam generated from a steam generator that generates steam using blast furnace gas as fuel, a trip may occur due to a rapid increase in the amount of heat generated by the blast furnace gas when a blast furnace blow-out occurs. It aims to prevent reliably and stably.

It is a systematic diagram which shows the outline | summary of a structure of the blast furnace burning power generation equipment which concerns on this Embodiment.

  Embodiments of the present invention will be described below. FIG. 1 is a system diagram showing an outline of the configuration of a blast furnace gas-fired power generation facility 1 according to the present embodiment.

  The blast furnace gas-fired power generation facility 1 includes a boiler 10 as a steam generator, a fuel supply facility 11 that supplies fuel containing blast furnace gas to the boiler 10, and heat of main steam that is high-temperature and high-pressure superheated steam generated from the boiler 10. A steam turbine 12 that converts energy into rotational energy, a generator 13 that converts rotational energy of the steam turbine 12 into electric power, a main steam pipe 14 that introduces main steam generated in the boiler 10 into the steam turbine 12, and a steam turbine 12 is provided in the water supply pipe 16 for connecting the boiler 10 and the condenser 15 to the condenser 15 for returning the steam whose enthalpy has been reduced by working to 12 to the water and storing it as condensate. A water supply pump 17 that supplies the boiler 10 with the condensate stored in the water tank 15. In the present embodiment, the boiler 10 is, for example, a circulation boiler having a drum (not shown) as an evaporator, and the steam turbine 12 is recovered by the condenser 15 in which the entire amount of steam that has flowed is recovered. A description will be given of the case.

  The fuel supply facility 11 has a coal supply system 20 that supplies coal as fuel to the boiler 10 and a blast furnace gas supply system 21 that supplies blast furnace gas as fuel. The coal supply system 20 is based on a coal bunker 30 for storing coal as fuel to be input to the boiler 10, a pulverized coal machine 31 for pulverizing and pulverizing coal, and a fuel input command from the control device 100 described later. A coal feeder 32 for supplying coal from the coal bunker 30 to the pulverized coal machine 31 is provided. The coal pulverized and pulverized by the pulverized coal machine 31 is supplied to the pulverized coal burner 33 along with the primary combustion air ventilated from the primary aerator (not shown) to the pulverized coal machine 31 and burned in the boiler 10. The

  The blast furnace gas supply system 21 includes a blast furnace gas supply pipe 41 branched at a branch point P from a blast furnace gas main pipe 40 through which a blast furnace gas discharged from the top of a blast furnace (not shown), and a fuel gas flowing through the blast furnace gas supply pipe 41. As a gas burner 42 for burning the blast furnace gas in the boiler 10. Between the gas burner 42 and the branch point P in the blast furnace gas supply pipe 41, a flow rate control valve 43 that controls the flow rate of the blast furnace gas supplied to the gas burner 42 is provided.

  Between the flow control valve 43 and the branch point P in the blast furnace gas supply pipe 41, a state quantity detection means 44 for detecting the state quantity of the blast furnace gas flowing through the blast furnace gas supply pipe 41 is provided. The state quantity detection means 44 is for detecting the occurrence of blow-through in the blast furnace and detecting the degree of blow-through (the degree of increase in the amount of heat generated by the blast furnace gas).

  The state quantity detection means 44 includes a calorific value measuring mechanism 44a that measures the calorific value of the blast furnace gas flowing through the blast furnace gas supply pipe 41, a temperature measuring mechanism 44b, a pressure measuring mechanism 44c, and a flow rate measuring mechanism 44d. The measurement results in the calorific value measurement mechanism 44a, temperature measurement mechanism 44b, pressure measurement mechanism 44c, and flow rate measurement mechanism 44d are also transmitted to the control device 100 described later. The state quantity detection means 44 is preferably arranged at a position as close as possible to the blast furnace gas mother pipe 40 (position as close as possible to the branch point P) in order to detect earlier that a blow-through has occurred in the blast furnace. Further, from the viewpoint of detecting earlier that the blast furnace blow-through has occurred, for example, when the state of the blast furnace gas is monitored by a state quantity detection means (not shown) provided in the blast furnace gas mother pipe 40, and the blast furnace blow-through is detected. In addition, a signal to that effect may be input to the control device.

  The main steam pipe 14 is provided with a steam pressure measuring mechanism 50 that measures the pressure of the main steam generated in the boiler, and a governor valve 51 that controls the flow rate of the main steam introduced into the steam turbine 12. The steam pressure measurement mechanism 50 is electrically connected to the control device 100, and the pressure detected by the steam pressure measurement mechanism 50 is input to the control device 100.

  Next, the control device 100 will be described. The control device 100 constantly monitors the state quantity of the blast furnace gas detected by the state quantity detection means 44, and detects the presence or absence of a blast furnace blow-through based on the state quantity. Specifically, when the calorific value of the blast furnace gas measured by the calorific value measuring mechanism 44a of the state quantity detecting means 44 (in this embodiment, the calorific value in the standard state) exceeds a predetermined threshold value, the blast furnace is blown through. Is determined to have occurred. In general, in the calorific value measuring mechanism 44a, the calorific value is measured as a value in a standard state (state at 0 ° C. and 1 atm), while in the flow rate measuring mechanism 44d, the actual blast furnace gas temperature and flow rate under pressure. Measured as (actual gas flow rate). Therefore, the control device 100 converts the calorific value of the blast furnace gas measured by the calorific value measuring mechanism 44a into the calorific value of the actual gas based on the measurement results of the temperature measuring mechanism 44b and the pressure measuring mechanism 44c. Then, the actual gas flow rate of the blast furnace gas supplied to the boiler 10 is calculated based on the calorific value after conversion and the required fuel input amount, and the opening degree of the flow rate control valve 43 is controlled based on the calculated actual gas flow rate. Yes. The flow rate measured by the flow rate measurement mechanism 44d is not strictly the actual gas flow rate, but the flow rate at the design pressure and temperature of the flow rate measurement mechanism 44d. Therefore, the flow rate correction is based on the actual pressure and temperature of the blast furnace gas. The obtained value is used for controlling the flow rate adjusting valve 43 and the like.

  Since the blast furnace gas discharged from the blast furnace is normally in a steam saturated state by water spraying in a venturi scrubber (not shown) or the like, the flow rate of the blast furnace gas supplied to the boiler 10 is calculated. In addition, based on the measurement results of the temperature measurement mechanism 44b and the pressure measurement mechanism 44c, correction for water vapor is also performed at the same time. For example, when the calorific value measuring mechanism 44a has a function of measuring the calorific value in the actual gas state, the temperature measuring mechanism 44b and the pressure measuring mechanism 44c are not necessarily provided.

When it is determined that a blow-through has occurred in the blast furnace, the control device 100 determines that the total calorific value of the fuel input to the boiler 10 after the occurrence of the blow-through is the total heat generation of the fuel input to the boiler 10 before the occurrence of the blow-through. The flow rate of the blast furnace gas to be reduced is calculated so as not to change from the amount. Specifically, for example, blast furnace gas is supplied at a flow rate of 300,000 Nm ³ / hr at a calorific value of 800 kcal / Nm ³ , a pressure of 4 kPa, a temperature of 40 ° C. before the blast furnace blow-through (normal time). Later, it is assumed that the detected value of the blast furnace gas in the state quantity detecting means 44 changes to a calorific value of 1200 kcal / Nm ³ , a pressure of 6 kPa, and a temperature of 70 ° C. In such a case, the control device 100 performs calculation so as to reduce the flow rate of the blast furnace gas, whose calorific value is approximately 1.5 times as a result of the blast furnace blow-through, to two thirds of 200,000 Nm ³ / hr. In the control device 100, the flow rate control valve 43 is set so that the supply amount of the blast furnace gas is 200,000 Nm ³ / hr, that is, the measured value at the flow rate measuring mechanism 44d is 200,000 Nm ³ / hr. Is controlled. At this time, the measurement value at the flow rate measurement mechanism 44d is corrected as appropriate based on the measurement results of the temperature measurement mechanism 44b and the pressure measurement mechanism 44c as described above.

  Further, in the control device 100, the control mode of the steam turbine 12 is switched along with the change of the set value of the fuel flow rate. Specifically, when no blast furnace blow-through has occurred and the blast furnace gas-fired power generation facility 1 is in a normal operation state, the control device 100 determines the amount of power in the generator 13 and the pressure of the main steam pipe 14. Control is performed in a so-called boiler turbine cooperative control mode, in which the engine is constantly controlled to a predetermined value. In this boiler turbine cooperative control, the opening degree of the governor valve 51 is adjusted by the control device 100 so that the output of the generator 13 matches the control set value, and the pressure of the main steam pipe 14, that is, the steam pressure measuring mechanism. The amount of fuel supplied to the boiler 10 is controlled so that the measured value at 50 matches the control set value. When the state quantity detection means 44 detects the blast furnace blow-through, the control device 100 decreases the amount of fuel supplied to the boiler 10 as described above. At the same time, the control mode is shifted to a so-called turbine follow mode (pre-pressure control) in which the main steam pressure is controlled by the governor valve 51 so that the measured value at the steam pressure measuring mechanism 50 does not change before and after the blast furnace blow-through. . This minimizes fluctuations in the amount of steam generated from the boiler 10 and minimizes fluctuations in the pressure of the main steam pipe 14.

  The blast furnace gas-fired power generation facility 1 according to the present embodiment is configured as described above. Next, in the blast furnace gas-fired power generation facility 1 according to the present embodiment, specific operations of each device when a blast furnace blow-through occurs will be described.

  During normal times when no blast furnace blow-through occurs, the heat generation amount of the blast furnace gas measured by the heat generation amount measuring mechanism 44a is constantly monitored by the control device 100. And when the calorific value of the blast furnace gas which flows through the blast furnace gas supply pipe 41 does not exceed a predetermined threshold value, in other words, when no blast furnace blow-through occurs, the control mode of the blast furnace gas-fired power generation facility 1 is the boiler. In the turbine coordination mode, the governor valve 51 operates to maintain the power generation amount of the generator 13, and the flow rate control valve 43 and the coal feeder 32 maintain the pressure of the main steam pipe 14 at the control set value, respectively. . In this state, the blast furnace gas introduced from the blast furnace gas main pipe 40 to the blast furnace gas supply pipe 41 is continuously supplied to the gas burner 42 of the boiler 10 by the flow rate control valve 43.

  And when the calorific value of the blast furnace gas monitored in the control apparatus 100 exceeds a predetermined threshold value, it is determined that a blast furnace blow-through has occurred.

  When the blast furnace blow-through occurs, the control device 100 sets the flow rate so that the total calorific value of the fuel supplied to the boiler 10 does not change before and after the blast furnace blow-through based on the heat generation amount of the blast furnace gas before and after the occurrence of the blast furnace blow-through. The flow rate of the blast furnace gas to be supplied to the boiler 10 is calculated via the control valve 43, and the calculated value becomes a new control set value. Then, the opening degree of the flow rate adjusting valve 43 is adjusted based on the new control set value.

  In addition, when the blast furnace blow-through occurs, the set value of the supply amount of the blast furnace gas is changed, and the control mode of the blast furnace gas-fired power generation facility 1 is switched from the boiler turbine cooperative control to the turbine follow mode. Thereby, the object to be controlled by the governor valve 51 becomes the pressure of the main steam from the output of the generator 13, that is, the measurement value of the steam pressure measuring mechanism 50 provided in the main steam pipe 14, and the pressure in the main steam pipe 14 is The opening degree of the governor valve 51 is controlled so as not to change before and after the occurrence of blast furnace blow-through.

  At this time, if the state quantity detection means 44 is installed at a position close to the branch point P from the blast furnace gas mother pipe 40, the control device 100 detects the blast furnace blow-through based on the measurement value of the state quantity detection means 44. Then, it is conceivable that there will be a time difference until the blast furnace gas whose calorific value has actually increased is supplied to the boiler 10. In such a case, it is conceivable that the total calorific value of the fuel supplied to the boiler 10 is temporarily reduced, the amount of steam generated from the boiler 10 is temporarily reduced, and the pressure of the main steam pipe 14 is lowered. The governor valve 51 is switched to the turbine follow mode (pre-pressure control), and the opening degree of the governor valve 51 is adjusted in the closing direction so that the pressure of the main steam pipe 14 does not decrease, for example. Therefore, it can suppress that process values, such as the steam temperature in the boiler 10, a steam pressure, are fluctuate | varied rapidly and significantly.

  As a result of the blast furnace blow-through, when the calorific value of the blast furnace gas supplied from the blast furnace gas supply pipe 41 increases, the total calorific value of the fuel finally supplied to the boiler 10 is the same as the value before the blast furnace blow-through. Become. As a result, even when the control mode is switched to the turbine follow mode, the pressure of the main steam pipe 14 and the output of the generator 13 are the same as before the blast furnace blow-through.

  After the operation in the turbine follow mode is continued, the amount of heat generated by the blast furnace gas gradually decreases when the blow-through of the blast furnace is settled. Under the circumstances, if the control set value of the flow rate control valve 43 is maintained in the state after the blast furnace blow-through, the total heat generation amount of the fuel charged into the boiler 10 gradually decreases. Therefore, for example, when the controller 100 confirms that the amount of heat generated from the blast furnace gas has been reduced and it is determined that the blow-through of the blast furnace has been stopped, the controller 100 gradually increases the control set value of the flow control valve 43 and finally Return to the state before the blast furnace was blown through. Then, after the pressure of the main steam pipe 14 and the output of the generator 13 are settled at desired values, the control mode in the control device 100 shifts again from the turbine follow mode to the boiler turbine cooperative mode, and the operation continues. Is done.

  According to the above embodiment, when a blow-through of the blast furnace occurs, the fuel flow rate supplied to the boiler 10 is a predetermined flow rate, that is, the fuel that is input to the boiler 10 before and after the occurrence of the blow-through of the blast furnace. In order to prevent the total calorific value of the blast furnace from fluctuating, the supply amount of the blast furnace gas is reduced, and the governor valve 51 is controlled so that the pressure of the main steam pipe 14 does not fluctuate before and after the blast furnace blow-through. Even when the calorific value fluctuates, fluctuations in the amount of heat input to the boiler 10 and fluctuations in the pressure of the main steam pipe 14 can be minimized. As a result, it is possible to reliably and stably prevent a trip from occurring due to a rapid increase in the amount of heat generated from the blast furnace gas, and to continue the operation of the blast furnace gas-fired power generation facility 1 in a stable state. it can.

  In the above embodiment, the fuel flow rate control is performed so that the total calorific value of the fuel input to the boiler 10 does not fluctuate before and after the blast furnace blow-through, in other words, the load of the boiler 10 does not fluctuate. Although the setting value has been changed, the method of determining the control setting value of the fuel flow rate after the blast furnace blow-through is not limited to the contents of the present embodiment. In other words, it does not deny that the load of the boiler 10 after the blast furnace blow-off is lower than the load before the blast furnace blow-through. For example, when the load of the boiler 10 is more than 80% and 100% or less, Control may be performed so that the load is uniformly 80%.

  Further, in the above embodiment, the control set value of the flow rate control valve 43 is changed to control the flow rate of the blast furnace gas when the blast furnace blows through, but the viewpoint of maintaining the total calorific value of the fuel that is input to the boiler 10. From the above, the control set value of the coal feeder 32 may be changed so that the amount of fuel other than blast furnace gas, for example, coal, is changed.

  Moreover, although this embodiment demonstrated as an example the case where the boiler 10 is a mixed-fired boiler of blast furnace gas and coal, the boiler 10 may be the exclusive combustion of blast furnace gas, for example. In such a case, it is sufficient that the fuel supply facility 11 has the blast furnace gas supply system 21, and the fuel containing the blast furnace gas means blast furnace gas supplied from the blast furnace gas supply system 21. The boiler 10 includes blast furnace gas and co-fired gas such as coke oven gas (COG), LNG, and LPG, or fuel oil such as light oil, kerosene, and heavy oil, or coal and blast furnace gas. It may be co-firing with fuel gas. In such a case, at least one of the control set values of the fuel supplied to the boiler 10 may be changed. In addition, the fuel gas containing blast furnace gas here also includes fuel gas composed only of blast furnace gas.

In the above embodiment, the steam generator is the boiler 10, but as the steam generator, any gas can be used as long as it can use blast furnace gas as fuel and generate steam, for example, using blast furnace gas as fuel. It may be a so-called GTCC (gas turbine combined cycle) facility that operates a turbine and generates steam with its exhaust gas. Even in such a case, the flow rate of the fuel supplied to the gas turbine when the blast furnace is blown through may be reduced, and the pressure of the main steam generated from the exhaust heat recovery boiler may be controlled by the governor valve 51 of the steam turbine 12.
It is preferable.

The control method during the blast furnace blow-through of the present invention is optimal for a steam generating boiler for blast furnace gas-fired power generation, but of course can also be applied to a blast furnace gas-fired boiler for other uses.

1 Blast furnace gas-fired power generation facility 10 Boiler
DESCRIPTION OF SYMBOLS 11 Fuel supply equipment 12 Steam turbine 13 Generator 14 Main steam pipe 15 Condenser 20 Coal supply system 21 Blast furnace gas supply system 21
DESCRIPTION OF SYMBOLS 30 Coal bunker 31 Pulverized coal machine 32 Coal feeder 40 Blast furnace gas main pipe 41 Blast furnace gas supply pipe 42 Gas burner 43 Flow control valve 44 State quantity detection means 44a Calorific value measurement mechanism 44b Temperature measurement mechanism 44c Pressure measurement mechanism 44d Flow measurement mechanism 50 Steam pressure measuring mechanism 51 Governor valve P Junction point

Claims (3)

A steam generator that burns fuel including blast furnace gas to generate steam, a steam turbine that converts thermal energy of steam generated by the steam generator into rotational energy, and converts rotational energy of the steam turbine into electric power A control method at the time of blast furnace blow-through in a blast furnace gas-fired power generation facility having a generator,
The steam turbine provided in a main steam pipe for reducing the flow rate of fuel supplied to the steam generator to a predetermined flow rate and supplying steam from the steam generator to the steam turbine when the blast furnace blows through. Set the control object of the governor valve that controls the amount of steam flowing into the main steam pipe pressure,
The control method at the time of blast furnace blow-off in a blast furnace gas-fired power generation facility, wherein the pressure control of the main steam pipe by the governor valve is performed so as to maintain the pressure of the main steam pipe before the blast furnace blow-through. The flow rate of the fuel supplied to the steam generator, which is decreased when the blast furnace blows through, is determined so that the total calorific value of the fuel supplied to the steam generator does not fluctuate before and after the blast furnace blow-through. The control method at the time of blast furnace blow-by in the blast furnace gas-fired power generation facility according to claim 1. The steam generator is a boiler;
The fuel supplied to the steam generator includes a fuel gas containing the blast furnace gas, or a fuel gas containing at least one of coal or oil and the blast furnace gas,
The fuel in which the flow rate of fuel supplied to the steam generator is reduced when the blast furnace is blown through,
When the fuel supplied to the steam generator is a fuel gas containing the blast furnace gas, it is a fuel gas containing the blast furnace gas,
When the fuel supplied to the steam generator includes at least one of the coal and the oil and a fuel gas containing the blast furnace gas, the fuel is at least one of the coal, the oil or the fuel gas containing the blast furnace gas. The control method at the time of blast furnace blow-by in the blast furnace gas-fired power generation facility according to any one of claims 1 and 2,

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