JP2010215809A - Controller of gasification device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller of a gasification device, with which fuel of a constant weight can be stably supplied. <P>SOLUTION: The controller includes load cells 61, 61, a means 661 for calculating real weight, a potentiometer 62, a memory part 67, a touch panel 63, a means 662 for calculating weight difference, and a means 663 for correcting rotation number. If the fuel weight Wr calculated by the means 661 for real weight is greater than the fuel weight Wd set by the touch panel 63, the means 663 performs the correction to decrease the rotation number of a screw conveyor 40, for the fuel weight difference ΔW, calculated by the means 662. Also, if the fuel weight Wr calculated by the means 661 for real weight is less than the fuel weight Wd set by the touch panel 63, the means 663 performs the correction to increase the rotation number of a screw conveyor 40, for the fuel weight difference ΔW, calculated by the means 662. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control device for a gasifier, and more particularly to a supply control technology for a screw conveyor that supplies fuel in a hopper to a gasifier.

  Conventionally, a technique for controlling a fuel supply amount of a screw conveyor according to a control device of a gasifier has been publicly known (see, for example, Patent Document 1). Here, as one of the gasifiers, a woody biomass power plant using sawdust or the like as fuel is widely known, and the control device of the gasifier described in Patent Document 1 is a rotation of a screw conveyor. By controlling the number to be constant, the fuel in the hopper can be supplied to the gasification furnace by a certain volume.

  However, if the specific gravity changes even if the fuel volume is constant, the weight of the fuel changes. However, since the control device of the gasifier described in Patent Document 1 has a constant rotation speed of the screw conveyor, There was a problem that the fuel of a constant weight could not be stably supplied, and thereby the amount of gas produced by the gasifier became unstable.

JP 2006-82963 A

  The present invention has been made in view of the above situation, and provides a control device for a gasifier capable of stably supplying a constant weight of fuel.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

  That is, in claim 1, a control device of a gasifier for controlling a fuel supply amount of a screw conveyor that supplies fuel in a hopper to a gasification furnace, wherein the weight detection means detects the fuel weight in the hopper. An actual weight calculating means for calculating an actual fuel weight supplied to the gasifier based on a change amount per unit time of the fuel weight in the hopper detected by the weight detecting means, and the screw Rotational speed detection means for detecting the rotational speed of the conveyor, storage means for storing a map that defines the relationship between the rotational speed of the screw conveyor and the fuel weight that can be supplied, and the fuel weight supplied to the gasifier The planned weight setting means set based on the map, the fuel weight calculated by the actual weight calculation means, and the fuel set by the planned weight setting means A weight difference calculating means for calculating a difference from the weight, and a rotation speed correcting means for correcting the rotation speed of the screw conveyor, wherein the rotation speed correcting means is a fuel weight difference calculated by the weight difference calculating means. When the fuel weight calculated by the actual weight calculating means is larger than the fuel weight set by the scheduled weight setting means, a correction is made to reduce the rotation speed of the screw conveyor, and the weight difference calculating means In the calculated fuel weight difference, when the fuel weight calculated by the actual weight calculating means is smaller than the fuel weight set by the scheduled weight setting means, a correction for increasing the rotation speed of the screw conveyor is performed. It is.

  According to a second aspect of the present invention, the storage means includes: a minimum correction value when performing correction for reducing the rotation speed of the screw conveyor; and a maximum correction value when performing correction for increasing the rotation speed of the screw conveyor. The rotational speed correction means stores the correction to decrease and increase the rotational speed of the screw conveyor within the range of the minimum correction value to the maximum correction value.

  According to a third aspect of the present invention, the storage unit stores a unit correction value obtained by dividing the difference between the maximum correction value and the minimum correction value into several units, and the rotation speed correction unit is configured to calculate the rotation correction unit from the minimum correction value. Within the range of the maximum correction value, the rotational speed of the screw conveyor is corrected in a stepwise manner using the unit correction value.

  According to a fourth aspect of the present invention, the storage means stores a threshold value related to a fuel weight difference calculated by the weight difference calculation means, and the rotational speed correction means has a fuel weight difference calculated by the weight difference calculation means. When the threshold value is exceeded, correction is performed to reduce and increase the rotational speed of the screw conveyor.

  According to a fifth aspect of the present invention, the storage means stores a minimum rotational speed related to the rotational speed of the screw conveyor and a maximum rotational speed related to the rotational speed of the screw conveyor, and after the correction by the rotational speed correcting means. A determination means for determining whether or not the rotation speed of the screw conveyor is within the range between the minimum rotation speed and the maximum rotation speed, the determination means rotating the screw conveyor after correction by the rotation speed correction means; When the number is higher than the minimum number of rotations and lower than the maximum number of rotations, the number of rotations of the screw conveyor corrected by the number of rotations correction unit is selected, and the number of screw conveyors corrected by the number of rotations correction unit is When the rotational speed is lower than the minimum rotational speed, the minimum rotational speed is selected, and the rotational speed of the screw conveyor after correction by the rotational speed correction means is If serial higher than the maximum rotational speed, and selects the maximum rotation speed.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, it is possible to stably supply a constant weight of fuel by correcting the rotational speed of the screw conveyor according to the fuel weight actually supplied to the gasification furnace. This stabilizes the amount of gas produced by the gasifier.

  According to the second aspect of the present invention, since the correction range of the rotation speed of the screw conveyor can be limited, it is possible to prevent malfunction of the gasifier due to a large change in the rotation speed due to excessive correction.

  In Claim 3, since the change of the rotation speed of a screw conveyor is moderate, it is possible to prevent malfunction of the gasifier due to a sudden change of the rotation speed.

  According to the fourth aspect of the present invention, since the rotational speed of the screw conveyor is not changed in the case of a slight weight fluctuation caused by disturbance, it is possible to prevent malfunction of the gasifier due to frequent changes in the rotational speed.

  According to the fifth aspect of the present invention, since the change range of the rotation speed of the screw conveyor can be limited, it is possible to prevent malfunction of the gasifier due to excessive or excessive rotation speed.

The figure which shows typically a gasification apparatus provided with a control apparatus. The control block diagram of a control apparatus. The map figure memorize | stored in a memory | storage part. The control flowchart of a control apparatus. The another control flow figure of a control apparatus.

  Next, the form for implementing this invention is demonstrated.

  The gasifier 1 shown in FIG. 1 is, for example, a woody biomass power plant using sawdust as fuel. “Fuel” in the following description refers to “sawdust” unless otherwise specified. The gasifier 1 includes a silo 10, a cutout conveyor 20, a hopper 30, a screw conveyor 40, a gasifier 50, a control device 60, and the like. In the gasifier 1, the fuel 11 stored in the silo 10 is transported by the cutting conveyor 20 and charged into the hopper 30 (fuel 21 shown in FIG. 1), and the fuel 31 in the hopper 30 is transported by the screw conveyor 40. The gasification furnace 50 is supplied. In addition, fuel is conveyed by the suitable conveying apparatus 70 between the screw conveyor 40 and the gasification furnace 50. FIG. The fuel supply amount of the screw conveyor 40 supplied to the gasification furnace 50 is controlled by the control device 60.

  A load cell 61, 61, a potentiometer 62, a touch panel 63, a motor 64, and an inverter 65 are connected to the control device 60 shown in FIG.

  The load cells 61 and 61 are an embodiment of the “weight detection means” according to the present invention. The load cells 61 and 61 detect the fuel weight in the hopper 30. The load cells 61 and 61 are attached to both ends of the lower part of the hopper 30 in the conveying direction of the screw conveyor 40. The fuel weight detected by the load cells 61 and 61 in the following description is an average value of the fuel weight in the hopper 30 detected by the two load cells 61 and 61.

  The potentiometer 62 is an embodiment of the “rotational speed detection means” according to the present invention. The potentiometer 62 is provided in the vicinity of the rotation axis of the screw conveyor 40 and detects the number of rotations of the screw conveyor 40.

  The touch panel 63 is an embodiment of the “scheduled supply amount setting means” according to the present invention. The touch panel 63 sets the fuel weight (hereinafter referred to as “scheduled weight”) Wd supplied to the gasification furnace 50 by the operator. The touch panel 63 displays a planned weight Wd and the like.

  The motor 64 is an actuator that rotates the screw conveyor 40. The output shaft of the motor 64 is connected to the rotation shaft of the screw conveyor 40 via an appropriate speed reducer.

  The inverter 65 supplies electric power to the motor 64 in accordance with a control signal from the control device 60 and drives the motor 64 to rotate at a predetermined rotational speed.

  The control device 60 includes a processing unit 66, a storage unit 67, a port, and the like.

  The processing unit 66 is configured by a CPU (Central Processing Unit) or the like. The processing unit 66 has functions related to the actual weight calculation unit 661, the weight difference calculation unit 662, the rotation speed correction unit 663, and the determination unit 664.

  The actual weight calculation means 661 calculates the actual fuel weight (hereinafter referred to as “actual weight”) Wr supplied to the gasification furnace 50 by the screw conveyor 40. The actual weight Wr is calculated based on the amount of change per unit time of the fuel weight in the hopper 30 detected by the load cells 61 and 61.

  The weight difference calculation means 662 calculates a difference (hereinafter referred to as “weight difference”) ΔW between the actual weight Wr and the planned weight Wd.

  The rotation speed correction means 663 corrects the rotation speed of the screw conveyor 40. That is, the rotation speed correction unit 663 corrects the control signal to the inverter 65 and changes the rotation speed of the motor 64. Specifically, when the actual weight Wr is larger than the planned weight Wd, the rotational speed correction unit 641 performs correction to reduce the rotational speed of the screw conveyor 40, and when the actual weight Wr is smaller than the planned weight Wd. Then, a correction for increasing the rotational speed of the screw conveyor 40 is performed. That is, when the actual weight Wr is larger than the planned weight Wd (when the actual amount of fuel supply is larger than the planned amount), the rotational speed correction means 641 reduces the rotational speed of the screw conveyor 40 to reduce the speed of the screw conveyor 40. When the fuel supply amount is reduced and the actual weight Wr is smaller than the planned weight Wd (when the actual fuel supply amount is less than the planned amount), the number of revolutions of the screw conveyor 40 is increased and the fuel supply of the screw conveyor 40 is performed. Increase the amount.

  The determining means 664 determines whether or not the rotational speed of the screw conveyor 40 after the correction by the rotational speed correcting means 663 is within the range between the minimum rotational speed Nmin and the maximum rotational speed Nmax, and according to the determination result, An appropriate rotation speed is selected from the rotation speed, minimum rotation speed Nmin, and maximum rotation speed Nmax of the screw conveyor 40 corrected by the rotation speed correction means 641.

  The storage unit 67 is an embodiment of the “storage unit” according to the present invention. The storage unit 67 includes a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The storage unit 67 stores a map 671, a minimum correction value ΔNmin, a maximum correction value ΔNmax, a unit correction value ΔN1, a threshold value ΔWd, a minimum rotation speed Nmin, and a maximum rotation speed Nmax.

  The map 671 defines the relationship between the rotation speed of the screw conveyor 40 and the fuel weight that can be supplied (scheduled weight Wd) (see FIG. 3). That is, the map 671 defines the fuel weight (scheduled weight Wd) that can be supplied by the screw conveyor 40 at an arbitrary rotation speed. The planned weight Wd is set by the operator using the touch panel 63 based on the map 671.

  The minimum correction value ΔNmin is a minimum correction value when correction is performed to reduce the rotation speed of the screw conveyor 40. That is, the minimum correction value ΔNmin defines a lower limit value when correction for reducing the rotation speed of the screw conveyor 40 is performed.

  The maximum correction value ΔNmax is the maximum correction value when correction is performed to increase the rotation speed of the screw conveyor 40. That is, the maximum correction value ΔNmax defines an upper limit value when correction for increasing the rotation speed of the screw conveyor 40 is performed.

  The unit correction value ΔN1 is a correction value obtained by dividing the difference between the maximum correction value ΔNmax and the minimum correction value ΔNmin into several parts. Here, the number to be divided is determined from the viewpoint of gently correcting the rotational speed of the screw conveyor 40 within the range of the minimum correction value ΔNmin to the maximum correction value ΔNmax.

  The threshold value ΔWd is a threshold value related to the fuel weight difference (weight difference ΔW) calculated by the weight difference calculating means. That is, the threshold value ΔWd is a threshold value that determines whether or not the weight difference ΔW enters the dead zone.

  The minimum rotation number Nmin is a minimum rotation number related to the rotation number of the screw conveyor 40. That is, the minimum rotational speed Nmin defines the lower limit value of the rotational speed of the screw conveyor 40.

  The maximum rotation speed Nmax is the maximum rotation speed related to the rotation speed of the screw conveyor 40. That is, the maximum rotational speed Nmax defines the upper limit value of the rotational speed of the screw conveyor 40.

  The control device 60 has a configuration in which a CPU, a ROM, a RAM, and the like are connected by a bus, but can also be configured by a one-chip LSI.

  Next, the control flow of the control device 60 will be described.

  As shown in FIG. 4, the screw conveyor 40 rotates at the basic rotation speed Nb (S1). The basic rotational speed Nb is arbitrarily set based on experience values or the like at the start of work.

  Then, the actual weight calculating unit 661 calculates the actual weight Wr every predetermined time (S2), and the weight difference calculating unit 662 compares the planned weight Wd with the actual weight Wr (from the planned weight Wd to the actual weight Wr). The weight difference ΔW is calculated (S3).

  When the weight difference ΔW is equal to or less than the threshold value ΔWd (S4: Y), the rotation speed correction unit 663 does not correct the rotation speed of the screw conveyor 40. That is, the screw conveyor 40 continuously rotates at the basic rotation speed Nb (S1).

  On the other hand, when the weight difference ΔW is larger than the threshold value ΔWd (S4: N), the rotation speed correction unit 663 corrects the basic rotation speed Nb of the screw conveyor 40.

  Here, when the actual weight Wr is larger than the planned weight Wd in S5 (S5: Y), the rotation speed correction means 663 subtracts the unit correction value ΔN1 from the current stage correction value ΔNn to correct the next stage correction. The value ΔN (n + 1) is calculated (S6).

  If the next-stage correction value ΔN (n + 1) is equal to or smaller than the minimum correction value ΔNmin in S7 (S7: Y), the rotation speed correction means 663 selects the minimum correction value ΔNmin (S8).

  Then, the rotation speed correction means 663 calculates the rotation speed N (n + 1) of the screw conveyor 40 by subtracting the minimum correction value ΔNmin from the basic rotation speed Nb of the screw conveyor 40 (S9).

  If the next stage correction value ΔN (n + 1) is larger than the minimum correction value Δmin in S7 (S7: N), the rotation speed correction means 663 adopts the correction value ΔN (n + 1) (S10).

  Then, the rotation speed correction means 663 calculates the rotation speed N (n + 1) of the screw conveyor 40 by subtracting the correction value ΔN (n + 1) from the basic rotation speed Nb of the screw conveyor 40 (S11).

  On the other hand, when the actual weight Wr is smaller than the planned weight Wd in S5 (S5: N), the rotation speed correction means 663 adds the unit correction value ΔN1 to the current stage correction value ΔNn, and the next stage correction value. ΔN (n + 1) is calculated (S12).

  If the next-stage correction value ΔN (n + 1) is greater than or equal to the maximum correction value ΔNmax in S13 (S13: Y), the rotation speed correction means 663 selects the maximum correction value ΔNmax (S14).

  Then, the rotational speed correction means 663 calculates the rotational speed N (n + 1) of the screw conveyor 40 by adding the maximum correction value ΔNmax to the basic rotational speed Nb of the screw conveyor 40 (S15).

  In S13, when the next-stage correction value ΔN (n + 1) is smaller than the maximum correction value ΔNmax (S13: N), the rotation speed correction unit 663 selects the correction value ΔN (n + 1) (S16).

  Then, the rotation speed correction means 663 calculates the rotation speed N (n + 1) of the screw conveyor 40 by adding the correction value ΔN (n + 1) to the basic rotation speed Nb of the screw conveyor 40 (S17).

  Next, in each of S9, S11, S15, and S17, when the rotation speed N (n + 1) of the screw conveyor 40 calculated by the rotation speed correction means 663 is within the range from the minimum rotation speed Nmin to the maximum rotation speed Nmax, That is, when the rotation speed is higher than the minimum rotation speed Nmin and lower than the maximum rotation speed Nmax (S18: Y), the determination unit 664 sets the rotation speed N (n + 1) as the basic rotation speed Nb (S19).

  When the rotational speed N (n + 1) of the screw conveyor 40 is higher than the maximum rotational speed Nmax (S18: N, S20: Y), the determination unit 664 sets the maximum rotational speed Nmax as the basic rotational speed Nb (S21). ).

  When the rotation speed N (n + 1) of the screw conveyor 40 is lower than the minimum rotation speed Nmin (S18: N, S20: N, S22), the determination unit 664 sets the minimum rotation speed Nmin as the basic rotation speed Nb. (S23).

  Note that the control flow shown in FIG. 4 is a control related to the fuel supply amount of the screw conveyor 40 in a state where the driving of the cutout conveyor 20 is stopped (that is, the fuel supply to the hopper 30 is stopped). As shown, when the fuel in the hopper 30 decreases and reaches a predetermined minimum weight, the cutout conveyor 20 is driven to restart the fuel injection into the hopper 30. While the fuel is being charged, the screw conveyor 40 is maintained at the rotation speed when the cutout conveyor 20 is driven. When the amount of fuel in the hopper 30 reaches a predetermined maximum weight after resuming the fuel input, the driving of the cutting conveyor 20 is stopped.

  As described above, the control device 60 of the gasifier 1 according to the embodiment of the present invention controls the fuel supply amount of the screw conveyor 40 that supplies the fuel in the hopper 30 to the gasifier 50. The control device 60 includes a load cell 61/61 for detecting the fuel weight in the hopper 30 and a gasification based on a change amount per unit time of the fuel weight in the hopper 30 detected by the load cell 61/61. Regarding the actual weight calculating means 661 for calculating the actual fuel weight Wr supplied to the furnace 50, the potentiometer 62 for detecting the rotation speed of the screw conveyor 40, and the relationship between the rotation speed of the screw conveyor 40 and the supplyable fuel weight A storage unit 67 for storing a map 671 to be defined, and a touch panel for setting the fuel weight supplied to the gasifier 50 based on the map 671 3, a weight difference calculating means 662 for calculating a difference ΔW between the fuel weight Wr calculated by the actual weight calculating means 661 and the fuel weight Wd set by the touch panel 63, and a rotational speed for correcting the rotational speed of the screw conveyor 40. The rotation speed correction means 663 is calculated by the actual weight calculation means 661 in comparison with the fuel weight Wd set by the touch panel 63 in the fuel weight difference ΔW calculated by the weight difference calculation means 662. When the fuel weight Wr is large, a correction is performed to reduce the rotational speed of the screw conveyor 40, and the actual weight calculation is performed with respect to the fuel weight difference ΔW calculated by the weight difference calculation means 662 than the fuel weight Wd set by the touch panel 63. If the fuel weight Wr calculated by the means 661 is small, the screw It performs a correction to increase the rotational speed of the conveyer 40.

  With such a configuration, it is possible to stably supply a constant weight of fuel by correcting the rotational speed of the screw conveyor 40 in accordance with the weight of fuel actually supplied to the gasification furnace 50. Thereby, the amount of generated gas of the gasifier 1 is stabilized.

  And the memory | storage part 67 memorize | stores the minimum correction value (DELTA) Nmin in the case of performing the correction which reduces the rotation speed of the screw conveyor 40, and the maximum correction value (DELTA) Nmax in the case of performing the correction which increases the rotation speed of the screw conveyor 40. The rotation speed correction means 663 performs correction to decrease and increase the rotation speed of the screw conveyor 40 within the range from the minimum correction value ΔNmin to the maximum correction value ΔNmax.

  With such a configuration, the correction range of the rotation speed of the screw conveyor 40 can be limited, so that it is possible to prevent malfunction of the gasifier 1 due to a significant change in the rotation speed due to excessive correction.

  Further, the storage unit 67 stores a unit correction value ΔN1 obtained by dividing the difference between the maximum correction value ΔNmax and the minimum correction value ΔNmin into several parts, and the rotational speed correction unit 663 stores the maximum correction value ΔNmax from the minimum correction value ΔNmin. In this range, the rotational speed of the screw conveyor 40 is corrected to decrease and increase stepwise using the unit correction value ΔN1.

  With such a configuration, since the change in the rotation speed of the screw conveyor 40 is moderate, it is possible to prevent malfunction of the gasifier 1 due to a sudden change in the rotation speed.

  Further, the storage unit 67 stores a threshold value ΔWd related to the fuel weight difference ΔW calculated by the weight difference calculation means 662, and the rotation speed correction means 663 indicates that the fuel weight difference ΔW calculated by the weight difference calculation means 662 is the threshold value. When ΔWd is exceeded, correction for decreasing and increasing the rotational speed of the screw conveyor 40 is performed.

  With such a configuration, in the case of a slight change in weight due to disturbance, since the rotation speed of the screw conveyor 40 is not changed, it is possible to prevent malfunction of the gasifier 1 due to frequent changes in the rotation speed. is there.

  The storage unit 67 stores the minimum rotation speed Nmin related to the rotation speed of the screw conveyor 40 and the maximum rotation speed Nmax related to the rotation speed of the screw conveyor 40, and the screw conveyor corrected by the rotation speed correction means 663. 40 is provided with determination means 664 for determining whether or not the rotational speed of 40 is within the range between the minimum rotational speed Nmin and the maximum rotational speed Nmax, and the determination means 664 of the screw conveyor 40 corrected by the rotational speed correcting means 663 When the rotational speed is higher than the minimum rotational speed Nmin and lower than the maximum rotational speed Nmax, the rotational speed of the screw conveyor 40 after correction by the rotational speed correction means 663 is selected, and the screw after correction by the rotational speed correction means 663 is selected. When the rotation speed of the conveyor 40 is lower than the minimum rotation speed Nmin, the minimum rotation speed Nmin is selected and rotated. Rotational speed of the screw conveyor 40 after correction by the correction means 663 is higher than the maximum rotational speed Nmax is for selecting the maximum rotation speed Nmax.

  With such a configuration, since the change range of the rotation speed of the screw conveyor 40 can be limited, it is possible to prevent malfunction of the gasifier 1 due to excessive and excessive rotation speeds.

  Next, another control flow of the control device 60 will be described.

  As shown in FIG. 5, when the screw conveyor 40 is being driven (S1) and the drive of the cutout conveyor 20 is stopped (S2), the control device 60 counts time from t1 when the screw conveyor 40 is stopped (S3).

  Further, at the same time as counting the time t1, the fuel weight W1 in the hopper 30 at the time t1 is detected by the load cells 61 and 61 (S4).

  Thereafter, the fuel weight W2 in the hopper 30 at time t2 (S5) is detected by the load cells 61 and 61 (S6). When the fuel weight W2 is larger than the planned weight Wd (S7: N), the control device 60 Without changing the rotation speed of the screw conveyor 40 (S1), the state where the driving of the cutting conveyor 20 is stopped is continued (S2).

  On the other hand, when the fuel in the hopper 30 decreases and the fuel weight W2 is equal to or less than the planned weight Wd (S7: Y), the control device 60 drives the cutout conveyor 20 (S8).

  The control device 60 calculates a time Δt from time t1 to time t2 (S9), and calculates a value Wr obtained by dividing the difference between the fuel weight W2 and the fuel weight W1 by the time Δt (S10). That is, the control device 60 calculates the fuel weight Wr per time Δt supplied by the screw conveyor 40 to the hopper 30.

  Then, the actual weight Wr is compared with the planned weight Wd (the actual weight Wr is subtracted from the planned weight Wd) to calculate the weight difference ΔW (S11). If the weight difference ΔW is less than or equal to the threshold value ΔWd (S12: Y ), The rotation speed of the screw conveyor 40 is not changed (S1).

  On the other hand, when the weight difference ΔW is larger than the threshold value ΔWd and larger than the planned weight Wd (S12: N, S13: Y), the rotation speed of the screw conveyor 40 is decreased by a predetermined number (S14), and the weight difference ΔW is larger than the threshold value ΔWd. If it is larger than the planned weight Wd (S12: N, S13: N), the rotational speed of the screw conveyor 40 is increased by a predetermined number (S15).

1 Gasifier 30 Hopper 40 Screw conveyor 50 Gasifier 60 Controller 61 Load cell (weight detection means)
62 Potentiometer (rotation speed detection means)
63 Touch panel (scheduled supply amount setting means)
67 Storage section (storage means)
661 Actual weight calculation means 662 Weight difference calculation means 663 Rotational speed correction means 664 Determination means 671 Map Nmax Maximum rotational speed Nmin Minimum rotational speed Wd Scheduled weight Wr Actual weight ΔN1 Unit correction value ΔNmax Maximum correction value ΔNmin Minimum correction value ΔW Fuel weight difference ΔWd threshold

Claims (5)

A control device for a gasifier that controls a fuel supply amount of a screw conveyor that supplies fuel in a hopper to a gasifier,
Weight detection means for detecting the fuel weight in the hopper;
An actual weight calculating means for calculating an actual fuel weight supplied to the gasifier based on a change amount per unit time of the fuel weight in the hopper detected by the weight detecting means;
A rotational speed detection means for detecting the rotational speed of the screw conveyor;
Storage means for storing a map defining the relationship between the number of rotations of the screw conveyor and the weight of fuel that can be supplied;
Scheduled weight setting means for setting the weight of fuel supplied to the gasifier based on the map;
A weight difference calculating means for calculating a difference between the fuel weight calculated by the actual weight calculating means and the fuel weight set by the scheduled weight setting means;
A rotational speed correcting means for correcting the rotational speed of the screw conveyor,
The rotational speed correcting means is
In the fuel weight difference calculated by the weight difference calculating means, when the fuel weight calculated by the actual weight calculating means is larger than the fuel weight set by the scheduled weight setting means, the number of rotations of the screw conveyor is set. Make a correction to decrease,
In the fuel weight difference calculated by the weight difference calculating means, when the fuel weight calculated by the actual weight calculating means is smaller than the fuel weight set by the scheduled weight setting means, the number of rotations of the screw conveyor is set. A control device for a gasifier that performs an increasing correction. The storage means stores a minimum correction value when correcting to reduce the rotation speed of the screw conveyor and a maximum correction value when correcting to increase the rotation speed of the screw conveyor,
2. The control device for a gasifier according to claim 1, wherein the rotation speed correction unit performs correction to decrease and increase the rotation speed of the screw conveyor within a range from the minimum correction value to the maximum correction value. The storage means stores a unit correction value in which the difference between the maximum correction value and the minimum correction value is divided into several parts,
The said rotation speed correction | amendment means performs the correction | amendment which reduces and increases the rotation speed of the said screw conveyor in steps using the said unit correction value within the range of the said minimum correction value to the said maximum correction value. Item 3. A control device for a gasifier according to Item 2. The storage means stores a threshold value related to a fuel weight difference calculated by the weight difference calculation means,
The said rotation speed correction | amendment means performs correction | amendment which reduces and increases the rotation speed of the said screw conveyor, when the fuel weight difference calculated by the said weight difference calculation means exceeds the said threshold value. The control apparatus of the gasification apparatus as described in any one. The storage means stores a minimum rotation speed related to the rotation speed of the screw conveyor and a maximum rotation speed related to the rotation speed of the screw conveyor,
A determination means for determining whether or not the rotation speed of the screw conveyor after correction by the rotation speed correction means is within the range between the minimum rotation speed and the maximum rotation speed;
The determination means includes
When the rotation speed of the screw conveyor after correction by the rotation speed correction means is higher than the minimum rotation speed and lower than the maximum rotation speed, the rotation speed of the screw conveyor corrected by the rotation speed correction means is selected. ,
When the rotational speed of the screw conveyor after correction by the rotational speed correction means is lower than the minimum rotational speed, select the minimum rotational speed,
The gas according to any one of claims 1 to 4, wherein when the rotation speed of the screw conveyor after correction by the rotation speed correction means is higher than the maximum rotation speed, the maximum rotation speed is selected. Control device

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