JP3820642B2 - Fuel pre-burner pressure control method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel burner pre-pressure control method and apparatus.
[0002]
[Prior art]
Some boilers use CWM (coal water mixture) and orimulsion as fuel. In the case of using CWM and orimulsion, the fuel flow control is usually performed by the number of revolutions of the fuel pump.
[0003]
However, since the speed of the fuel pump has a lower limit and cannot be lowered below a certain speed, in the lower limit range, the fuel flow control is not performed at the fuel pump speed but part of the fuel at the fuel pump outlet. The pressure control is performed by the pre-burner pressure control for escaping and returning to the service tank. Normally, when one pair of burners completes the combustion, the fuel flow control is shifted from the pre-burner pressure control to the rotation speed control of the fuel pump.
[0004]
However, when the capacity of the fuel pump becomes large, it is not possible to shift to the rotational speed control of the fuel pump unless after combustion of several pairs of burners. At the time of point fire extinguishing of the burner in the stage, the pre-burner pressure cannot be quickly set to the specified value because the pre-burner pressure is lowered or increased by opening or closing the fuel injection valve.
[0005]
Therefore, in order to stabilize the pre-burner pressure during the pre-burner pressure control, which is the stage before shifting to the rotation speed control of the fuel pump, conventionally, the pre-burner pressure control is temporarily interrupted when the burner is extinguished, Alternatively, the opening of the pressure control valve is adjusted based on a program corresponding to the number of burner pairs.
[0006]
Thus, an example of the fuel supply system in the case where the pre-burner pressure control is temporarily interrupted when the burner is extinguished is shown in FIG. 4, where 1 is a fuel main pipe provided with a fuel pump 2 in the middle. 3a and 3b are branched into a plurality of fuel pipes from the tip of the fuel main pipe 1, and fuel pipes provided with fuel injection valves 4a and 4b in the middle, and 5a and 5b are fuel pipes branched into two from the tips of the fuel pipes 3a and 3b. , 6a, 6b are a plurality of pairs of fuel injection burners connected to the ends of the fuel injection pipes 5a, 5b, and each of the fuel injection burners 6a, 6b burns in pairs.
[0007]
Reference numeral 7 denotes a fuel return pipe connected to the fuel main pipe 1 at the downstream side of the fuel flow direction D of the fuel pump 2 and having a pressure control valve 8 in the middle, and the fuel passing through the fuel return pipe 7 is returned to the service tank. It is like that.
[0008]
A pressure detector 9 is connected so as to be located on the downstream side in the fuel flow direction D with respect to the fuel return pipe 7 connection portion of the fuel main pipe 1 and detects the pre-burner pressure of the fuel flowing in the fuel main pipe 1.
[0009]
10 is a signal generator that outputs a command of a pre-burner set pressure P1 or P3 (P1≈P3) when the fuel injection burners 6a and 6b are ignited, and 11 is a pre-burner set pressure P2 when the fuel injection burners 6a and 6b are extinguished. Alternatively, a signal generator that outputs a command of P4 (P2≈P4 <P1≈P3), 12 is switched to the a side at the time of ignition and outputs the pre-burner set pressure P1 or P3 from the signal generator 10, and at the time of fire extinguishing, Switch to the b side and output the pre-burner set pressure P2 or P4 from the signal generator 11, and 13 switch to the b side when there is no point fire extinguishing command (other than during point fire extinguishing) In the case of a point fire extinguishing when a pre-burner set pressure P1, P3 or P2, P4 is output from the switcher 12 and a point fire extinguishing command is given, the preburner detected by the pressure detector 9 is switched to the a side. Outputs detected pressure P A switching unit that was.
[0010]
14, when there is no point fire extinguishing command, the rate of change is limited until the pre-burner set pressure P1, P3 or P2, P4 from the switch 13 is reached, and a pre-burner pre-set pressure signal is output. A change rate limiter 15 is provided from the change rate limiter 14 so as to be able to output the pre-burner detected pressure P from the pressure detector 9 by releasing the rate limit restriction (excluding the rate) when a command is given. The subtractor for calculating the pre-burner pressure deviation ΔP by taking the difference between the pre-burner set pressure P1, P3 or P2, P4 or the pre-burner detection pressure P and the pre-burner detection pressure P directly applied from the pressure detector 9. Is a proportional-integral controller that performs proportional-integral processing on the pre-burner pressure deviation ΔP from the subtractor 15 and supplies the result to the pressure control valve 8 as a valve opening adjustment command V1.
[0011]
For example, when one pair of fuel injection burners 6a is burning and then the second pair of fuel injection burners 6b is ignited and the ignition command has not been given yet, the switcher 12 is moved to the a side, The switch 13 is switched to the b side.
[0012]
For this reason, the pre-burner set pressure P1 is output from the signal generator 10, is supplied to the change rate limiter 14 via the switches 12 and 13, and is supplied to the subtractor 15 as a signal with a limited change rate.
[0013]
The pre-burner pressure of the fuel fed through the fuel main pipe 1 detected by the pressure detector 9 is given to the subtracter 15 as the pre-burner detection pressure P. In the subtracter 15, the pre-burner set pressure P1 and the pre-burner pressure The difference between the detected pressures P is obtained as the pre-burner pressure deviation ΔP, and the obtained pre-burner pressure deviation ΔP is given to the proportional-plus-integral controller 16.
[0014]
The pre-burner pressure deviation ΔP given to the proportional integration controller 16 is subjected to proportional integration processing to obtain a valve opening adjustment command V1, and the obtained valve opening adjustment command V1 is given to the pressure control valve 8 to adjust the pressure. The opening of the control valve 8 is adjusted in response to the valve opening adjustment command V1, and thus the pre-burner set pressure P1 and the pre-burner detection are controlled by controlling the flow rate of fuel returned from the fuel return pipe 7 to the service tank. The pressure control operation is performed so that the pressure P becomes equal, that is, the pre-burner pressure deviation ΔP becomes zero.
[0015]
When ignition is performed on the fuel injection burner 6b with the fuel injection burner 6a burned, the fuel injection valve 4b is opened by the ignition command and the switch 13 is switched to the a side, and the rate of change limiter 14 is excluded from the rate. The For this reason, the pre-burner detection pressure P detected by the pressure detector 9 is directly supplied to the subtractor 15 and is also supplied to the subtracter 15 via the switching unit 13 and the rate-of-change limiter 14 excluding the rate.
[0016]
Therefore, the pre-burner pressure deviation ΔP obtained by the subtracter 15 becomes zero, the valve opening adjustment command V1 is not output from the proportional-plus-integral regulator 16, and the opening of the pressure control valve 8 does not change. As a result, the pressure of the fuel supply system is temporarily not controlled during ignition.
[0017]
Further, after a predetermined time after the fuel injection burner 6b is ignited, the switch 13 is switched to the b side, and the rate of change limiter 14 is released from the rate exclusion.
[0018]
For this reason, thereafter, the pressure control valve 8 causes the pre-burner set pressure P3 from the signal generator 10 and the pre-burner detected pressure P detected by the pressure detector 9 to be equal, that is, the pre-burner pressure deviation ΔP is zero. Thus, the opening degree of the pressure control valve 8 is adjusted, and the pressure control of the fuel supply system is performed.
[0019]
For example, when the fuel injection burner 6b is extinguished while the fuel injection burners 6a and 6b are burning, the switcher 12 is switched to the b side when no fire extinguishing command is given, and the signal generator 11 The pre-burner pressure deviation ΔP, which is the difference between the pre-burner pre-set pressure P4 from the above and the pre-burner detected pressure P detected by the pressure detector 9, is obtained by the subtractor 15, and the pre-burner pressure deviation ΔP is obtained by the proportional integral controller 16. Proportional integration processing is performed to obtain a valve opening adjustment command V1, and the pressure control valve 8 is adjusted by the valve opening adjustment command V1 so that the pre-burner pressure deviation ΔP becomes zero, and pressure control is performed.
[0020]
When a fire extinguishing command is given to the switching device 13 and the change rate limiter 14, the fuel injection valve 4b is closed and the switcher 13 is switched to the a side, and the change rate limiter 14 is excluded from the rate. For this reason, the pre-burner detected pressure P detected by the pressure detector 9 is directly supplied to the subtractor 15 and simultaneously supplied to the subtractor 15 via the switch 13 and the change rate limiter 14. The pressure deviation ΔP before the burner is zero, and as a result, the valve opening adjustment command V1 is not output from the proportional-plus-integral regulator 16 to the pressure control valve 8, and the opening of the pressure control valve 8 does not change. The pressure in the fuel supply system is temporarily not controlled.
[0021]
Further, after a specified time after the fuel injection burner 6b is extinguished, the switch 13 is switched to the b side, and the rate limiter 14 is released from the rate exclusion.
[0022]
Therefore, thereafter, the pressure control valve 8 has a pre-burner pressure deviation ΔP, which is a difference between the pre-burner set pressure P2 from the signal generator 10 and the pre-burner detection pressure P detected by the pressure detector 9, being zero. Thus, the opening degree of the pressure control valve 8 is adjusted, and pressure control is performed.
[0023]
FIG. 5 shows the relationship between the fuel flow rate and the pre-burner pressure when performing the above ignition and extinguishing. That is, for example, when the fuel injection burner 6b is ignited while the fuel injection burner 6a is operated so that the pre-burner pressure becomes P1, the fuel injection valve 4b is opened by the ignition command, and the fuel is injected from the fuel injection burner 6b. Injection starts. At this time, since the pressure control valve 8 is not temporarily controlled and is in a state of maintaining a constant opening, the pressure before the burner rapidly decreases as indicated by P1 to P2 of the vertical line A in FIG. Then, as shown by the curve C, as the fuel flow rate gradually increases, the pressure control by the pressure control valve 8 is resumed and the pre-burner pressure is recovered.
[0024]
Further, when the fuel injection burner 6b is extinguished while the operation is performed so that the pressure before the fuel injection burners 6a and 6b becomes P3, the fuel injection valve 4b is closed by the fire extinguishing command, and the fuel injection burner 6b Fuel injection is stopped. At this time, since the pressure control valve 8 is temporarily not pressure-controlled and maintains a constant opening, the pre-burner pressure suddenly increases as indicated by P2 to P1 in the vertical line A in FIG. As shown by curve B, as the fuel flow rate gradually decreases, the pressure control by the pressure control valve 8 is resumed and the pre-burner pressure gradually decreases.
[0025]
In FIG. 5, curve B shows the relationship between the fuel flow rate and the pre-burner pressure when the number of burner pairs is one pair, and in the case of curve C, the fuel flow rate and the pre-burner pressure when the number of burner pairs is two pairs. Show the relationship.
[0026]
In the case of the above-mentioned device, the opening degree of the pressure control valve 8 is temporarily kept constant during point extinction and the pressure control is not performed for the following reason. That is, when the point is extinguished, the pre-burner pressure detected by the pressure detector 9 suddenly drops or rises. Therefore, when the opening degree of the pressure control valve 8 is adjusted based on the pre-burner pressure that changes rapidly, the pressure control valve 8 This is because the opening degree of the valve changes greatly and it takes time to shift to stable pressure control.
[0027]
Next, FIG. 6 shows an example of a fuel supply system in the case where the opening degree of the pressure control valve is adjusted based on a program corresponding to the number of burner pairs during point extinction of the burner. In FIG. A function generator 18 that outputs the valve opening command V2 of the pressure control valve 8 based on the program by the number of pairs 6a and 6b, 18 is a pressure control valve that limits the rate of change of the valve opening command V2 from the function generator 17 8 is a change rate limiter for suppressing the opening / closing speed of 8, and the fuel supply system itself is the same as in the case of FIG.
[0028]
In the function generator 17, as shown in FIG. 7, when the number of burner pairs increases, the opening degree of the pressure control valve 8 is gradually reduced to increase the pressure of the fuel injected from the fuel injection burners 6a and 6b stepwise. The function F (x) is input as a program.
[0029]
In the case of this example, when the fuel injection burners 6a and 6b are ignited or extinguished, the fuel injection valves 4a and 4b are opened or closed according to the burner pair number command, and a valve opening command V2 corresponding to the burner pair number is generated as a function. The pressure control valve 8 is given to the pressure control valve 8 from the vessel 17, and the pressure control valve 8 is program-controlled to an opening degree corresponding to the number of burner pairs.
[0030]
For this reason, in the fuel supply system of FIG. 6, for example, even if the fuel injection valve 4b is opened and the fuel injection burner 6b is ignited while the fuel injection burner 6a is burning, the pre-burner pressure does not rapidly decrease. Even if the fuel injection valve 4b is closed and the fuel injection burner 6b is extinguished while the fuel injection burners 6a and 6b are burning, the pre-burner pressure does not increase rapidly. Therefore, in the case of FIG. 6, a stable pre-burner pressure can be obtained quickly even during point extinction, and unstable combustion due to a drop in pre-burner pressure during ignition can be prevented.
[0031]
[Problems to be solved by the invention]
In the case of the fuel supply system shown in FIG. 4, it is difficult to quickly maintain the pre-burner pressure at a specified value because the pre-burner pressure rapidly decreases or rises when the burner is extinguished. There is a possibility that unstable combustion of the fuel injection burner may occur due to a decrease in pressure.
[0032]
Further, in the case of the fuel supply system shown in FIG. 6, since a stable pre-burner pressure can be obtained quickly even when the burner point is extinguished, the pre-burner pressure does not decrease at the time of ignition, so the fuel injection burner 6a, There is no risk of unstable combustion of 6b.
[0033]
However, when the fuel is CWM or orimulsion, the valve and the valve seat of the pressure control valve 8 wear with the passage of time of use, and therefore even if the same number of pairs is used immediately after the start of use and after a certain period of use, the pressure control valve 8 There is a problem that a difference occurs in the opening and the stability of the control is lacking.
[0034]
In view of the above circumstances, the present invention makes it possible to quickly obtain a stable pre-burner pressure when the fuel injection burner is extinguished and to control the pressure control valve even when the valve and the valve seat are worn by use. The purpose is to prevent the stability from being lost.
[0035]
[Means for Solving the Problems]
In the present invention, when the burner is ignited or extinguished, the opening degree of the pressure control valve of the fuel return pipe connected to the pipeline from the fuel pump to the fuel injection burner based on the valve opening degree instruction determined by the program corresponding to the number of burner pairs After reaching the specified time from the burner ignition or extinguishing, the valve opening adjustment command obtained by processing the difference between the preset pre-burner set pressure and the pre-burner detection pressure in the pipeline is opened . A correction valve opening adjustment command is obtained by adding to the degree command, and the opening of the pressure control valve is adjusted by the correction valve opening adjustment command.
[0036]
The present invention is a function generator for outputting a valve opening command determined by a program corresponding to the number of burner pairs,
At the time of ignition, the pre-burner set pressure given by the signal generator that outputs the pre-burner set pressure at the time of ignition is output, and at the time of fire extinguishing, the pre-burner set pressure that is output from the signal generator that outputs the pre-burner set pressure at the time of fire extinguishing A first switch for outputting a set pressure;
At the time of ignition or extinguishing, the pre-burner detection pressure detected by the pressure detector connected to the pipe line from the fuel pump to the fuel injection burner is output, and before the burner from the first switching device except at the time of ignition or extinguishing A second switch for outputting the set pressure;
A subtractor for calculating a pre-burner pressure deviation by taking a difference between the pre-burner detection pressure from the pressure detector and the pre-burner detection pressure or the pre-burner set pressure from the second switch;
A controller for processing a pre-burner pressure deviation obtained by the subtractor to obtain a valve opening adjustment command;
The corrected valve opening adjustment command is obtained by adding the valve opening command from the function generator and the valve opening adjustment command from the regulator, and from the fuel pump to the fuel injection burner based on the corrected valve opening adjustment command. An adder is provided for adjusting the opening degree of the pressure control valve of the fuel return pipe connected to the pipe line.
[0037]
In the present invention, the opening degree of the pressure control valve is controlled based on a program at the time of point extinction, and is controlled by both the pre-burner pressure of the fuel and the program corresponding to the number of burner pairs after reaching the specified time from the burner ignition or extinguishing. .
[0038]
For this reason, in the present invention, the pre-burner pressure at the time of point-extinguishing can be quickly held at a specified value, and unstable combustion of the fuel injection burner due to a decrease in the pre-burner pressure at the time of ignition does not occur and control is performed. Improves stability.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0040]
FIG. 1 shows an example of the embodiment of the present invention. In this embodiment, the control system for temporarily interrupting the pre-burner pressure control as shown in FIG. 4 and the number of burner pairs as shown in FIG. Both of the control system for adjusting the opening degree of the pressure control valve based on the program are installed, and the valve opening degree adjustment command V1 output from the proportional integration controller 16 and the valve opening degree instruction V2 from the change rate limiter 18 are After adding by the adder 19, it can be given to the pressure control valve 8 as a corrected valve opening adjustment command V3.
[0041]
In addition, since each apparatus other than the adder 19 is the same as the apparatus shown in FIGS. 4 and 6, the same reference numerals are given to the same parts, and the description is omitted.
[0042]
Next, the operation in the embodiment of the present invention will be described.
[0043]
For example, when one pair of fuel injection burners 6a is burning and then the other pair of fuel injection burners 6b is ignited and an ignition command has not yet been given, switching is performed as in FIG. The switch 12 is switched to the a side, and the switch 13 is switched to the b side.
[0044]
For this reason, the pre-burner set pressure P1 is output from the signal generator 10, is supplied to the change rate limiter 14 via the switches 12 and 13, and is supplied to the subtractor 15 as a signal with a limited change rate.
[0045]
The pressure of the fuel fed through the fuel main pipe 1 detected by the pressure detector 9 is given to the subtractor 15 as the pre-burner detection pressure P. In the subtracter 15, the pre-burner set pressure P1 and the pre-burner detection pressure P Is obtained as the pre-burner pressure deviation ΔP, and the obtained pre-burner pressure deviation ΔP is supplied to the proportional-plus-integral controller 16.
[0046]
The pre-burner pressure deviation ΔP supplied to the proportional integration controller 16 is subjected to proportional integration processing to obtain a valve opening adjustment command V1, and the obtained valve opening adjustment command V1 is supplied to the adder 19.
[0047]
On the other hand, the valve opening command V2 is output from the function generator 17 corresponding to the number of burner pairs (here, one pair), and is supplied to the adder 19 via the change rate limiter 18.
[0048]
The adder 19 adds the valve opening degree adjustment command V1 from the proportional integral regulator 16 and the valve opening degree instruction V2 from the change rate limiter 18 to obtain a corrected valve opening degree adjustment command V3, and the obtained correction is obtained. The valve opening adjustment command V3 is given to the pressure control valve 8, and the opening degree of the pressure control valve 8 is adjusted so that the pre-burner pressure corresponding to the number of burner pairs is obtained.
[0049]
Therefore, since the pre-burner pressure control and the program control are used in combination, the stability of the pressure control is not lost over time, and the stable pressure control can be performed.
[0050]
When ignition is performed on the fuel injection burner 6b with the fuel injection burner 6a burned, the fuel injection valve 4b is opened by the ignition command and the switch 13 is switched to the a side, and the rate of change limiter 14 is excluded from the rate. The For this reason, the pre-burner detection pressure P detected by the pressure detector 9 is directly supplied to the subtractor 15 and is also supplied to the subtractor 15 via the switch 13 and the change rate limiter 14.
[0051]
Therefore, the pre-burner pressure deviation ΔP obtained by the subtracter 15 becomes zero, and the valve opening degree adjustment command V1 given from the proportional-plus-integral regulator 16 to the adder 19 becomes zero.
[0052]
Therefore, at the time of ignition, only the valve opening command V2 output from the function generator 17 corresponding to the number of burner pairs (in this case, 2 pairs) is given to the pressure control valve 8, and the pressure control valve 8 is set to the number of burner pairs. Program controlled to an appropriate opening.
[0053]
For this reason, in this embodiment, even if the fuel injection valve 4b is opened while the fuel injection burner 6a is burning and the fuel injection burner 6b is ignited, the pre-burner pressure does not rapidly decrease and is stable. Thus, the pre-burner pressure can be obtained, so that unstable combustion does not occur in the fuel injection burners 6a and 6b.
[0054]
In addition, when the specified time is reached after the fuel injection burner 6b is ignited, the switch 13 is switched to the b side, and the rate exclusion of the change rate limiter 14 is also cancelled. The pre-burner pressure deviation ΔP, which is the difference between the pre-burner pre-set pressure P3 from the pressure sensor 9 and the pre-burner detected pressure P from the pressure detector 9, is obtained, and the pre-burner pressure deviation ΔP is proportionally integrated by the proportional-plus-integral controller 16. It is given to the adder 19 as the valve opening adjustment command V1, added to the valve opening command V2 determined in accordance with the number of burner pairs, and given to the pressure control valve 8 as the corrected valve opening adjustment command V3. Since the pre-burner pressure control and the program control are used in combination, stable pressure control is performed without losing the stability of the pressure control over time.
[0055]
For example, when the fuel injection burner 6b is extinguished while the fuel injection burners 6a and 6b are combusting, the switch 12 is switched to the b side when no fire extinguishing command is given. The pre-burner set pressure P4 is given to the subtractor 15, and thereafter the opening degree of the pressure control valve 8 is adjusted in the same procedure as when the fuel injection burner 6b is ignited.
[0056]
When a fire extinguishing command is given, the switch 13 is switched to the a side, and the valve opening adjustment command V1 from the proportional integral controller 16 becomes zero as described above. 8 is program-controlled by a valve opening command V2 corresponding to the number of burner pairs.
[0057]
Further, when the specified time has elapsed after the fuel injection burner 6b is extinguished, the switch 13 switches to the b side, and thereafter, the difference between the pre-burner set pressure P2 from the signal generator 11 and the pre-burner detected pressure P. The corrected valve opening adjustment command V3 is obtained by adding the valve opening adjustment command V1 obtained based on the pre-burner pressure deviation ΔP and the valve opening command V2 from the function generator 17, and the corrected valve opening adjustment command V3 is obtained. The pressure control valve 8 is controlled by V3.
[0058]
Therefore, also in this case, the pre-burner pressure control and the program control are used together, and stable pressure control is possible.
[0059]
The relationship between ignition time, pre-burner pressure, and pressure control valve opening in the present embodiment is shown in FIG. 2, and the relationship between fire extinguishing time, pre-burner pressure, and pressure control valve opening is shown in FIG. Has been. Thus, it can be seen from FIG. 2 that the pre-burner pressure P2 ′ at the time of burner ignition does not decrease so much and is higher than P2. Accordingly, the pre-burner pressure is quickly held at the pre-burner set pressure P3.
[0060]
Similarly, the pre-burner pressure is quickly maintained at the pre-burner set pressure P2 during fire extinguishing.
[0061]
In the embodiment of the present invention, the case where two pairs of fuel injection burners are provided has been described. However, any number of pairs can be implemented, and various modifications can be made without departing from the scope of the present invention. Of course.
[0062]
【The invention's effect】
According to the fuel pre-burner pressure control method and apparatus of the present invention, in any of claims 1 and 2, the pre-burner pressure at the time of fire extinguishing can be quickly held at a specified value, Unstable combustion of the fuel injection burner due to a decrease in the pre-burner pressure does not occur, stable combustion is possible, and various excellent effects such as no loss of controllability over time due to use can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of an embodiment of a fuel pre-burner pressure control method and apparatus according to the present invention.
FIG. 2 is a graph showing the relationship between ignition time, pre-burner pressure, and pressure control valve opening in the present invention.
FIG. 3 is a graph showing the relationship between fire extinguishing time, pre-burner pressure, and pressure control valve opening in the present invention.
FIG. 4 is a block diagram of an example in the case where the pre-burner pressure control is temporarily interrupted when the burner is extinguished in a conventional fuel pre-burner pressure control apparatus;
5 is a graph showing the relationship between the fuel flow rate and the pre-burner pressure when control is performed by the pre-burner pressure control device for fuel shown in FIG. 4;
FIG. 6 is a block diagram of an example when program control is performed in a conventional fuel pre-burner pressure control apparatus;
7 is a graph showing a function set in a function generator in the fuel pre-burner pressure control apparatus shown in FIG. 6; FIG.
[Explanation of symbols]
1 Fuel main pipe (pipe)
2 Fuel pumps 6a and 6b Fuel injection burner 7 Fuel return pipe 8 Pressure control valve 9 Pressure detectors 10 and 11 Signal generators 12 and 13 Switch 15 Subtractor 16 Proportional integral regulator (regulator)
17 Function generators P1, P2, P3, P4 Pre-burner set pressure P Pre-burner detection pressure ΔP Pre-burner pressure deviation (difference)
V1 Valve opening adjustment command V2 Valve opening command V3 Correction valve opening adjustment command

Claims (2)

When the burner is ignited or extinguished, based on the valve opening command determined by the program corresponding to the number of burner pairs, the opening of the pressure control valve of the fuel return pipe connected to the pipeline from the fuel pump to the fuel injection burner is adjusted, After the specified time has elapsed since the burner ignition or extinguishing, the valve opening adjustment command obtained by processing the difference between the preset pressure before the burner and the pre-burner detection pressure in the pipe is added to the valve opening command. Then, a correction valve opening adjustment command is obtained, and the opening degree of the pressure control valve is adjusted by the correction valve opening adjustment command. A function generator that outputs a valve opening command determined by a program corresponding to the number of burner pairs;
At the time of ignition, the pre-burner set pressure given by the signal generator that outputs the pre-burner set pressure at the time of ignition is output, and at the time of fire extinguishing, the pre-burner set pressure that is output from the signal generator that outputs the pre-burner set pressure at the time of fire extinguishing A first switch for outputting a set pressure;
At the time of ignition or extinguishing, the pre-burner detection pressure detected by the pressure detector connected to the pipe line from the fuel pump to the fuel injection burner is output, and before the burner from the first switching device except at the time of ignition or extinguishing A second switch for outputting the set pressure;
A subtractor for calculating a pre-burner pressure deviation by taking a difference between the pre-burner detection pressure from the pressure detector and the pre-burner detection pressure or the pre-burner set pressure from the second switch;
A controller for processing a pre-burner pressure deviation obtained by the subtractor to obtain a valve opening adjustment command;
The corrected valve opening adjustment command is obtained by adding the valve opening command from the function generator and the valve opening adjustment command from the regulator, and from the fuel pump to the fuel injection burner based on the corrected valve opening adjustment command. A pre-burner pressure control device for a fuel, comprising an adder for adjusting an opening degree of a pressure control valve of a fuel return pipe connected to a leading pipe.

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