JPH0988631A - Gas fuel burning gas turbine misfire preventing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the misfire of a combustor and supply stable electric power under automatic control of taking in the change of gas fuel conditions, formed of at least the heat quantity and temperature of fuel supplied to a gas fuel burning turbine, as a gas turbine control signal and making the heating value of fuel constant with this gas turbine control signal. SOLUTION: By-product gas from a pressure energy recovery turbine 2 is subjected to measurement of heat quantity and temperature change by a calorimeter 3 and a temperature gage 4 provided in a pipe 25A with a control valve 25. By-product gas from a gas compressor 8 is burnt in a gas turbine 9 and subjected to measurement of exhaust gas temperature by a temperature gage 22. A calorimeter 18 is provided to measure the heating value of gas fed to the gas compressor 8 to obtain a signal for operating to open/close a control valve 17 for controlling the supply quantity of converter gas 12. Steam obtained by a waste heat recovery boiler 10 is used as turbine output control steam by controlling the internal temperature of the gas turbine 9 through a switching valve 21 of a steam pipeline 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas fuel fired gas turbine misfire prevention method.

[0002]

2. Description of the Related Art Conventionally, gas with a stable calorific value has been used as the fuel for gas-fuel-fired gas turbines. However, the by-product gas used in steelworks, etc. depends on the operating conditions of the equipment that produces the by-product gas. The amount of heat may change, and the by-product gas used in gas-fuel-fired gas turbines was mixed with other fuels to stabilize the amount of heat and prevent the gas turbine combustor from misfires, ensuring stable operation. .

[0003]

However, the conventional technique has the following problems. 1. If there is only one type of by-product gas that is continuously generated from the by-product gas for fuel used in gas-fired gas turbines used in steel mills, etc., another by-product gas that stabilizes the change in the calorific value of the by-product gas for fuel Therefore, there is a drawback that the combustor of the gas turbine misfires due to unstable combustion. 2. When the amount of heat or temperature of the by-product gas for fuel of the gas fuel-fired gas turbine changes, it is not possible to understand the abnormality until the changed gas fuel enters the combustor of the gas fuel-fired gas turbine. It had the drawback that it would misfire.

Therefore, the present invention has been made in view of the above-mentioned problems, and in particular, the present invention has been changed by taking in advance any change in the by-product gas for fuel of the gas-fired gas turbine as a gas turbine control signal. It is an object of the present invention to provide a gas fuel fired gas turbine misfire prevention method that is excellent in stable operation by performing an abnormal response operation before the gas fuel enters the combustor of the gas fuel fired gas turbine.

[0005]

A gas fuel fired gas turbine misfire prevention method according to the present invention incorporates, as a gas turbine control signal, a change in gas fuel conditions such as at least heat quantity and temperature of fuel supplied to a gas fuel fired gas turbine. ,
A method of preventing misfire of a combustor of the gas fuel-fired gas turbine by automatically controlling the calorific value of the fuel sent to the gas fuel-fired gas turbine to be constant by the gas turbine control signal.

Further, by taking in as a gas turbine control signal changes in gas fuel conditions such as the heat quantity and temperature of the fuel supplied to the gas fuel-fired gas turbine, steam injection for increasing the amount of auxiliary fuel, inputting auxiliary fuel and increasing output is carried out. Is stopped, and control is performed so that the calorific value of the fuel fed to the gas fuel-fired gas turbine becomes constant to prevent misfire of the combustor of the gas fuel-fired gas turbine.

More specifically, the amount of heat of the gas fuel supplied to the gas-fuel-fired gas turbine installed in the ironworks is reduced when the amount of heat generated by the byproduct gas generation facility in the ironworks is reduced by the gas. This is a method of capturing as a turbine control signal.

More specifically, the change in the calorific value of the gas fuel supplied to the gas-fuel-fired gas turbine installed in the ironworks is reduced due to an abnormality in the auxiliary equipment of the byproduct gas generation equipment in the ironworks. This is a method of capturing as a gas turbine control signal.

More specifically, the change when the calorific value of the gas fuel is lowered due to an abnormality in the gas fuel-fired boiler for power generation in the gas fuel pipe system for supplying to the gas fuel-fired gas turbine installed in the steel mill Is taken in as a gas turbine control signal.

More specifically, due to an abnormality of the pressure energy recovery turbine in the gas fuel piping system for supplying fuel to the gas fuel burning gas turbine installed in the steel mill,
This is a method of capturing a change when the temperature of the gas fuel rises as a gas turbine control signal.

More specifically, when the calorific value and the temperature of the gas fuel supplied to the gas fuel-fired gas turbine installed in the steel mill change, the gas fuel is injected for the purpose of eliminating the change in the heat input to the gas-fuel-fired gas turbine. A method for preventing misfiring of a combustor of the gas fuel-fired gas turbine by introducing a gas fuel having a high calorific value in addition to a by-product gas having a high calorific value continuously or intermittently generated in a steel mill or the like.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a gas fuel fired gas turbine misfire prevention method according to the present invention will be described in detail below with reference to the drawings. Generally, a stable operation condition is that there is no change in heat quantity or temperature of the gas fuel of the gas fuel-fired gas turbine 7 in FIG. Therefore, as an event in which the calorific value of the gas fuel or the temperature change, which is a factor that hinders stable operation, occurs, there are changes in the operation of the by-product gas generation facility in a steelworks, a gas fuel-fired gas turbine 7 installed in a steelworks, etc. There is an abnormality in the gas fuel-fired boiler 5 of the power plant, an abnormality in the auxiliary equipment of the byproduct gas generation facility, an abnormality in the pressure energy recovery turbine 2, an abnormality in the heat generation amount of the byproduct gas, etc. Therefore, in the present invention, the abnormalities due to the above-mentioned operating factors and the factors that hinder the stable operation of the gas fuel-fired gas turbine caused by the abnormality of the energy recovery device provided in the piping system are grasped and stabilized early. The purpose is to obtain power generation.

FIG. 1 is a schematic diagram for explaining an arrangement example of a piping system for supplying by-product gas fuel to be supplied to a gas fuel-fired gas turbine 7, auxiliary fuel and auxiliary combustion fuel, and other equipment. Pressure energy of the B gas 1a generated from the blast furnace is recovered by a pressure energy recovery turbine (abbreviated as TRT) 2 that recovers the pressure energy of the B gas,
The amount of heat and temperature of the by-product gas discharged from the pressure energy recovery turbine 2 are measured by a calorimeter 3 and a thermometer 4 provided in a pipe 25A having a control valve 25, and the gas fuel burning gas is measured based on the measured values. Misfire prevention control of the turbine 7 is performed. Tube 2 provided with this calorimeter 3 and thermometer 4
A gas-fuel-fired boiler 5 for power generation for obtaining steam for power generation is provided midway on the downstream side of 5A.

The remainder of the by-product gas fired by the gas fuel-fired boiler 5 further flows through the pipe 13 connected to the pipe 25A to remove dust contained in the gas.
Is supplied to the gas compressor 8 of the gas-fuel-fired gas turbine 7 via. The by-product gas emitted from the gas compressor 8 is combusted in the gas turbine 9, and the combustion exhaust gas is measured with the thermometer 22 to measure the exhaust gas temperature and the waste heat recovery boiler 10
Is discharged to the atmosphere from the chimney 11.

A control valve 17 for controlling the supply amount of the converter gas (abbreviated as LDG) 12 by measuring the calorific value of the gas supplied to the gas compressor 8 of the gas combustion fired gas turbine 7.
A calorimeter 18 is provided to generate a signal for opening and closing. The steam obtained in the waste heat recovery boiler 10 is used as turbine output control steam by controlling the temperature in the gas turbine 9 via the opening / closing valve 21 of the steam pipe 14.

Another by-product gas supplied to the gas-fuel-fired gas turbine 7, a converter gas 12 generated by blowing of a converter (not shown) and a B gas 1b generated from another blast furnace are also electrostatic precipitators. Piping is made to enter from the front side of 6. Heavy fuel oil A, LPG, and butane gas are used as the auxiliary fuel 19, and a flow meter 20 is provided for grasping the supply amount supplied to the gas turbine 9, and the fuel supplied by a signal from the flow meter 20 is supplied to each. Flow control valve 1 that controls the amount of
6 are provided.

Next, the operation will be described. First, gas generated from a plurality of gas generating equipments supplied to the gas fuel-fired gas turbine 7, for example, blast furnace gas, converter gas or coke oven gas in a steel mill, and heat quantity and temperature of gas fuel generated from oil refinery equipment. A change in gas fuel conditions such as the above is taken in as a gas turbine control signal (not shown) to control the variable vane 23 provided in the gas compressor 8 of the gas turbine to change the amount of gas to be supplied, and the signal gas By controlling the turbine, the gas flow rate is controlled so that the calorific value of the fuel sent to the gas turbine 7 becomes constant.
It is automatically controlled by 7.

Further, when the gas fuel supply amount decreases, the exhaust gas temperature of the gas turbine 9 decreases and the power generation amount decreases. Therefore, in order to compensate for the temperature decrease, a heat amount corresponding to the decrease in the gas fuel supply amount is used. In order to compensate, the control valve 17 and the flow control valve 16 for the auxiliary combustion fuel 19 are opened / closed based on the instruction of the calorimeter 18 of the converter gas 12 which is the auxiliary fuel to monitor the flow meter 20 to control the amount to be blown. By closing the on-off valve 21 of the steam injection for increasing the output to stop the steam blowing and raising the temperature in the gas turbine 9, the total heat quantity to be supplied becomes constant so that the gas fuel-fired gas turbine 7 can be operated. Prevent misfire of the combustor.

Gas generated from a plurality of gas generating equipments to be supplied to the gas fuel-fired gas turbine, for example, blast furnace gas, converter gas or coke oven gas in a steel mill, and calorific value of gas fuel generated from petroleum refining equipment, Regarding the temperature and the like, the calorific value of the gas changes as the gas temperature changes, as shown in FIG. 4, for example. A change in the gas fuel condition is taken in as a gas turbine control signal to control a variable vane 23 provided in the gas compressor 8 of the gas fuel-fired gas turbine 7 to change the amount of gas to be supplied, and further to reduce the gas heat amount. The amount of heat that is almost equal to the amount of heat generated by the gas that compensates for the decrease in the exhaust gas temperature of the turbine caused by A
Alternatively, the supply of the auxiliary combustion fuel 19 such as butane gas is increased, and the output-increasing steam sent to the gas turbine 9 is stopped to raise the temperature of the combustion chamber of the gas turbine 9 to increase the total amount of fuel sent to the gas turbine 9. Control is performed so that the calorific value becomes constant, and misfire of the combustor is prevented.

By-product gas generated from a blast furnace or converter equipment in a steelworks or the like, for example, B gas of the blast furnace is lowered by a change in operation of the blast furnace such as depressurization operation, reduction wind operation, blow-through, break air, etc.
When the calorific value of the by-product gas fuel supplied to the gas-fuel-fired gas turbine 7 installed in the by-product gas piping system decreases, the decrease is sent to the gas compressor 8 of the gas-fuel-fired gas turbine 7 as a gas turbine control signal. The variable stator vane 23 provided is controlled so that the amount of heat equivalent to the decrease in the supply amount of the by-product gas is compensated by this gas turbine control signal so that the auxiliary fuel 19 such as heavy fuel oil A, LPG, or butane gas is supplied. Of the by-product gas having a large amount of heat generated continuously or intermittently in a steel mill or the like, for example, the converter gas 12 of the converter, and stopping the steam injection for increasing the output fed to the gas turbine 9 to stop the gas turbine 9 By raising the temperature of the combustion chamber and eliminating the change in the amount of heat input to the gas fuel-fired gas turbine 7, the above-mentioned misfire of the combustor is prevented.

Further, a pulverized coal blowing facility (P shown in FIG. 3 which is a by-product gas generating facility, for example, an auxiliary facility of a blast furnace facility).
CI) or an oxygen addition facility or the like, when the heat quantity of the gas fuel supplied to the gas fuel-fired gas turbine 7 decreases,
The signal of the change is taken in as a gas turbine control signal, and by this gas turbine control signal, the amount of auxiliary combustion fuel 19 is increased, and the converter gas 12 which is a by-product gas having a high calorific value continuously or intermittently generated in a steel mill or the like is input and gas. By eliminating the change in the amount of heat input to the gas fuel-fired gas turbine 7 due to stopping the steam injection for increasing the output that lowers the temperature in the turbine 9, the above-mentioned misfire of the combustor is prevented. Further, the boiler of the gas fuel-fired boiler 5 for power generation in the gas fuel pipe system that supplies gas fuel-fired gas turbine 7 installed in a by-product gas pipe system generated from a blast furnace or a converter facility in a steelworks or the like. Due to the rise in furnace pressure and drum level abnormality,
When the flow rate balance with other by-product gas generators is lost and the heat quantity of the gas fuel supplied to the gas fuel-fired gas turbine 7 changes, a signal of the change is taken in as a gas turbine control signal, and this gas turbine control signal The amount of auxiliary combustion fuel 19 is increased by this, and the converter gas 12, which is a by-product gas having a high calorific value continuously or intermittently generated in a steel plant or the like, is input, and further, the steam injection for increasing the output fed to the gas turbine 9 is stopped to stop the gas. By increasing the temperature of the combustion chamber of the turbine 9 to eliminate the change in the amount of heat input to the gas fuel-fired gas turbine 7, misfire of the combustor is prevented.

Further, a pressure energy recovery turbine 2 in a gas fuel piping system for supplying fuel to a gas fuel burning gas turbine 7 installed in a by-product gas piping system generated from a blast furnace or a converter equipment in a steelworks or the like. When the temperature of the gas fuel that supplies fuel to the gas fuel-fired gas turbine rises due to an abnormality such as a trip of the gas turbine, the signal change is used as a gas turbine control signal in the gas compressor 8 of the gas turbine.
The flow control valve 16 provided in the pipe system is incorporated so as to control the variable vane 23 provided in the control system, and the gas turbine control signal increases the amount of the auxiliary fuel 19 such as A heavy oil, LPG, or butane gas. The amount of heat input to the gas-fuel-fired gas turbine 7 is controlled by stopping the injection of the converter gas 12 having a high heat amount continuously or intermittently generated in a steel mill or the like and the steam injection for increasing the output that lowers the temperature in the turbine by controlling. Preventing misfire of the combustor by eliminating the change.

Further, the by-product gas fuel supplied to the gas-fuel-fired gas turbine 7 installed in the by-product gas piping system generated from a blast furnace or a converter equipment in a steel mill or the like is usually generated by a by-product gas generator. When the heat quantity and temperature change due to a gradual change even during operation, the quantity of heat generated continuously or intermittently in a steel plant, etc. is supplied to the gas-fuel-fired gas turbine 7 for the purpose of eliminating the change in heat quantity. In addition to the high converter gas 12, a gas fuel having a high calorific value is introduced to prevent misfire of the combustor.

Therefore, the method of preventing the misfire of the gas-fired gas turbine 7 is to change the operation of the by-product gas generating equipment in a steelworks or the like, and to use the gas fuel piping system of a gas-fueled gas turbine installed in a steelworks or the like. , The abnormality of the gas fuel-fired boiler 5 for power generation, the abnormality of the pressure energy recovery turbine 2, etc. are taken in as a gas turbine control signal, and the unstable gas fuel whose heat quantity and temperature have changed is transferred to the combustor of the gas fuel-fired gas turbine 7. Before entering, the temperature inside the gas turbine 9 is increased by increasing the amount of auxiliary fuel, inputting a by-product gas having a high calorific value continuously or intermittently generated in a steel mill or the like, or supplying a gas fuel having a high calorific value, and stopping the steam injection for increasing the output. Since it is raised and acts so as to stabilize the heat quantity and temperature of the gas fuel, misfire prevention of the gas fuel-fired gas turbine 7 can be achieved.

Further, as shown in FIG. 3, the blast furnace operation such as decompression operation, de-air operation, blow-through, idle air, etc. in the operation of the blast furnace 30
B gas which is a by-product gas when there is a change in the operation of the equipment, an ancillary equipment 31 of the by-product gas generation equipment such as a failure of the PCI equipment, a failure of the oxygen addition equipment, a gas fuel burning boiler failure, a TRT failure, and a blast furnace gas calorie reduction. Although there is a fluctuation in the supply amount of 1a and 1b, this fluctuation takes a short time until it is supplied to the gas fuel-fired gas turbine 7, and the calorimeter 3 and the thermometer 4 provided in the pipe of the gas fuel-fired gas turbine 7 If it is detected, the control of the gas fuel-fired gas turbine 7 will be delayed, so that the depressurizing operation, the reducing air operation, the blow through, the resting air, P
When an abnormality occurs in the CI or the like, this abnormality signal is taken into the controller 26 of FIG. 3 as a turbine control signal, and before the changed B gas 1a is supplied to the gas turbine 9, the converter gas 12 which is auxiliary fuel and the auxiliary combustion fuel 19 The flow control valve 16 and the control valve 17 are opened so as to be supplied through the auxiliary combustion fuel pipe 15, and the on-off valve 21 is closed to stop the supply of steam from the boiler 10 to raise the ambient temperature of the gas turbine 9. , The amount of heat input is increased to prevent misfire.

Further, even if a failure occurs in the pressure energy recovery turbine 2 or the boiler 5 installed in the same piping system, a failure signal is introduced into the gas fuel-fired gas turbine 7 to check the gas supply amount in the same manner as described above. The control valve 16 and the flow control valve 17 are opened and further opened and closed so as to supply the converter gas 12 and auxiliary fuel 19 which are auxiliary fuels so that the operation of the gas fuel-fired gas turbine 7 is not affected even if there is a change. Valve 21
Is closed to stop the supply of steam from the boiler 10 to raise the ambient temperature of the gas turbine 9 and increase the amount of heat input to prevent misfire. Therefore, the control methods described above can be summarized as shown in FIG. 2. The by-product gas generation operation abnormality 50, the by-product gas generation equipment incidental equipment abnormality 51, the gas fuel-fired boiler abnormality 52, Due to the pressure energy recovery turbine abnormality 53 and the normal heat quantity / temperature fluctuation 54 of the by-product gas, the misfire prevention is achieved by the auxiliary fuel increase 60, the auxiliary fuel injection 61 and the steam injection stop 62. Further, the present invention is not limited to the above-mentioned steel mill,
It can also be applied to other equipment.

[0027]

EFFECTS OF THE INVENTION According to the present invention, by-product gas generation in a steelworks or the like, which is a factor of the heat quantity and temperature change of the gas fuel of the gas fuel-fired gas turbine, is not observed but the state of B gas from the blast furnace is observed. Preliminary capture of changes in equipment operation, abnormalities in the gas fuel-fired boiler at the power plant in the gas fuel piping system of the gas fuel-fired gas turbine installed in steelworks, and abnormalities in the equipment system such as the pressure energy recovery turbine Since the input gas calorie is increased to prevent the gas turbine from misfiring, the abnormality control operation can be quickly performed by the automatic control, so that the gas fuel-fired gas turbine can be stably operated. Further, when the gas fuel-fired gas turbine is used for power generation, stable power can be supplied. Moreover, troubles due to misfire are eliminated, and the life of the equipment of the gas fuel-fired gas turbine is extended. Furthermore, since the automatic control enables quick response to the abnormality, the mental load on the operator is reduced.

[Brief description of drawings]

FIG. 1 is a flow chart of equipment of a steel mill or the like that utilizes a gas fuel fired gas turbine misfire prevention method according to the present invention.

FIG. 2 is a system flow diagram of the present invention.

FIG. 3 is a schematic control diagram illustrating the present invention.

FIG. 4 is a diagram illustrating a relationship between a temperature of a by-product gas and a calorific value.

[Explanation of symbols]

 1a, 1b B gas 2 Pressure energy recovery turbine 3 Calorimeter 4 Thermometer 5 Boiler 6 Electrostatic precipitator 7 Gas fuel fired gas turbine 8 Gas compressor 9 Gas turbine 10 Boiler 12 Converter furnace gas 16 Flow control valve 17 Control valve 18 Calorimeter 19 Auxiliary fuel 20 Flow meter 21 On-off valve 22 Thermometer 23 Stationary vane variable 26 Controller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F02C 7/00 F02C 7/00 A 9/28 9/28 C

Claims (7)

[Claims] 1. A gas turbine control signal, which takes in as a gas turbine control signal a change in a gas fuel condition consisting of at least the amount of heat and temperature of the fuel supplied to the gas fuel-fired gas turbine (7), and uses the gas turbine control signal to control the gas fuel-fired gas turbine.
By automatically controlling the calorific value of the fuel sent to (7), the gas fuel-fired gas turbine is controlled.
(7) A method for preventing misfire of a gas fuel-fired gas turbine, which comprises preventing misfire of the combustor. 2. Increasing the amount of auxiliary fuel, inputting auxiliary fuel and increasing the output by taking in changes in the gas fuel conditions such as the heat quantity and temperature of the fuel supplied to the gas fuel-fired gas turbine (7) as a gas turbine control signal. To prevent misfire of the combustor of the gas fuel-fired gas turbine (7) by stopping the steam injection for use and controlling the calorific value of the fuel sent to the gas fuel-fired gas turbine (7) to be constant. A method for preventing misfire of a gas combustor-fired gas turbine, which is characterized by: 3. The change in the heat quantity of the gas fuel supplied to the gas-fuel-fired gas turbine (7) installed in the steel mill when the operation amount of the by-product gas generation facility in the steel mill is reduced by the gas. The method for preventing misfire of a gas fuel-fired gas turbine according to claim 1 or 2, wherein the method is taken in as a turbine control signal. 4. A change when the calorific value of a gas fuel supplied to a gas fuel-fired gas turbine (7) installed in a steel mill is reduced due to an abnormality in an auxiliary equipment of a byproduct gas generation facility in the steel mill. The gas-fired gas turbine misfire prevention method according to claim 1 or 2, wherein the method is taken in as a gas turbine control signal. 5. A change when the calorific value of the gas fuel is reduced due to an abnormality of the boiler (5) for power generation in the gas fuel piping system that supplies the gas fuel-fired gas turbine (7) installed in the steel mill. The method for preventing misfire of a gas fuel-fired gas turbine according to claim 1 or 2, further comprising: 6. A gas fuel piping system for supplying fuel to a gas fuel-fired gas turbine (7) installed in a steel mill,
3. A gas fuel fired gas turbine misfire prevention method according to claim 1, wherein a change when the temperature of the gas fuel rises due to an abnormality of the pressure energy recovery turbine is taken in as a gas turbine control signal. 7. When the amount of heat and the temperature of the gas fuel supplied to the gas fuel-fired gas turbine (7) installed in a steel mill are changed, the gas fuel is injected for the purpose of eliminating the change in the amount of heat input to the gas-fuel-fired gas turbine. In addition to a by-product gas having a high calorific value continuously or intermittently generated in a steel mill, etc., a gas fuel having a high calorific value is introduced to prevent misfire of the combustor of the gas fuel-fired gas turbine. Gas turbine misfire prevention method.