JPS59188701A - Boiler master controlling device - Google Patents

Abstract

PURPOSE:To always control a coal-fired boiler stably with a boiler master controlling device irrespectively of the variation of load, etc., by correcting the gain of the master controller of the device in accordance with the boiler load and using burner stage. CONSTITUTION:The output of a main steam pressure oscillator 1 and the value of a setter 9 are subjected to subtraction and inputted into a multiplier 10. The value of the output of the main steam pressure oscillator 1 after passing through a primary delaying element 5 and opening/closing operator 6 and its differentiated value are inputted into an adder 3. The output of a signal generator 12, namely, the signal of the using stage of coal is transmitted to adders 13 and 14 via switching relays 20-14. By calculating the outputs of the adders 13 and 14 at a divider 15, a signal related to the using method of the coal stage is obtained and the output of a function generator 17, which adjusts a master gain so as to appropriately change the master gain through a primary delaying element 16, is calculated with the output of another function generator 18, which adequately changes the gain of a boiler master system, and the calculated result becomes a correct signal of master gain.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a boiler master control device, and particularly to a boiler master control device that can be applied to coal-fired boilers.

As a conventional coal-fired gain mask control device, for example, the first
What is shown in the block diagram of the figure is known. 1st
In the figure, 1 is a main steam pressure transmitter, 2 is a first-order delay element that sets the main steam pressure with a setting device 9, 6 is a square root calculator,
7 is a differentiator. The output of the square root calculator 6 is the main steam flow rate signal, which can be directly used as a leading signal or used as a differentiator 2.
The adder 3 performs a differential operation, and the adder 3 adds the output of the mask controller 2, which is then passed through the A/M 11 to become a boiler master signal.

This kind of coal-fired boiler crushes the coal and uses it as pulverized coal, so there is a large response delay in the fuel system.Is that why? Adjusting the Illama Master controller is difficult. Even if the mask controller is adjusted in the best condition under a certain load, if the load changes and the gain changes to a different load, the gain response will change, so it may be necessary to adjust the mask controller again. Another disadvantage is that the responsiveness of the gain changes depending on the stage of the coal-burning burner used, and readjustment may be required.

The present invention has been made in view of the above circumstances, and an object of the invention is to correct the dyne of the boiler mask controller to an optimum value according to the load and the burner stage used, and to reduce load fluctuations and To provide a boiler master control device capable of always performing stable and constant control regardless of changes in burner stages.

The boiler master control device according to the present invention is equipped with a correction circuit that corrects the gain of the mask controller in the boiler master control device for a coal-fired boiler according to the boiler load and the burner stage used. It is also possible to perform stable control at all times.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals and will be explained.

In Fig. 2, I is the main steam pressure starting point (1 in g), and this output and the value set by setting device 9 are 1 in subtractor 2.
) are compared. The output of the subtracter 2 is a deviation signal, which can be operated on by a multiplier ro to change the dyne of the control loop. II is a proportional/integral controller. Adders 3 to A/Ms each have the same effects as those shown in FIG. 1, so a description thereof will be omitted. I8 is a function generator which is adjusted to appropriately change the gain of the boiler master system in accordance with the main steam flow rate signal (ie, boiler load) VC.

I2 is a signal generator and is adjusted to a certain constant value.

Reference numerals 20 to 24 are switching relays, respectively, and the stages to be used (
The relays of the continuously used coal feeders transmit the output of the signal generator 12 to the adders 13 and I4, but the relays of unused stages do not output.

In addition, each switching relay 20 to 24 corresponds to each stage (coal feeder).
Corresponding to [J, the input key of adder I3 is also set for each stage. Further, the input dynes of the adder 14 are all adjusted to the same value without being different for each stage. By calculating the outputs of these adders 13 and 14 with the divider 15, a signal related to the continuous use method of the coal stage is obtained, but this signal changes in a stepwise manner when any stage enters operation. VCL is set so that the signal does not suddenly change through the first-order delay signal I6.

I7 is a function generator that adjusts the master gain to change appropriately in relation to the operating method of the coal stage, and the output of this and the output of the function generator I8 is calculated by a multiplier I9 to calculate the master gain. This is used as a correction signal.

Next, the operation of the above embodiment of the present invention will be explained.

Since one embodiment of the present invention is configured as described above, for example, in relation to the boiler load, the mask gain can be increased in the high load region, but in the low load region, the response delay becomes longer, so the master gain can be increased. It is not possible. father,)
Regarding the operation of the goose tier, while the lower berth is in use, the upper berth is
(For use by March 1st Officer)] You can raise Masterdine.

Taking these points into consideration, the master dyne can be adjusted depending on the load and the burner stages used so that the gain is always appropriate.

Based on the above, I) According to the present invention, in a coal-fired boiler master control device, the gain of the boiler mask ° controller is always corrected to the optimum value according to the boiler, load, and burner stage used. By providing this circuit, an excellent effect can be achieved in that stable control is always possible regardless of load fluctuations and changes in the burner stage used.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional boiler master control device, and FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. IO... Multiplier, 11... Proportional/integral controller, I2... Signal generator, 13.14... Adder, 15
...Divider, I6...-Next lag element, 77°I8.
...Function generator, 19... Multiplier, 20-24...
switching relay.

Claims (1)

[Claims] A boiler master control device comprising a correction circuit that corrects the gain of a mask controller in a boiler mask control device for a coal-fired boiler in accordance with the boiler load and the burner stage used.