SU1702109A1 - Apparatus for automatically controlling air flow to burners of boiler unit - Google Patents

Abstract

The invention relates to a power system and allows for improved control accuracy. In the device, the coal dust flowing into the bunker 1 through the chute 2 into the pipe 3 is followed by the flow of coal dust into the open end of the output end 12 of the auxiliary pipe 9, the level of which depends on the amount of air flow through the auxiliary pipe 9, which is regulated by the servo motor 11. Feed control air in the burner is carried out according to the level of coal dust entering the auxiliary pipeline, which is controlled by the generator 13 and the threshold elements 14, 15, the output to toryh connected to the servomotor 5. 2-yl.

Description

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The invention relates to a power system and can be used in automatic control systems of a boiler.

The purpose of the invention is to improve the accuracy of regulation.

FIG. 1 shows a device for automatically regulating the supply of air to a boiler burner; Fig. 2 is a timing diagram of a change in the consumable parameters of the device.

The device contains a hopper 1 for coal dust with chute 2 installed in the pipe 3 supplying air to the boiler burners, regulator 4 with servo motor 5, fuel consumption sensor 6 hydraulic resistance 7 screen 8. additional pipe 9 with second regulator 10 with servo motor 11. Pipeline 9 is installed between the boot.

The joint of the pipeline 3 for supplying air to the burners downstream of the regulator 4 and the upper cavity 2, and the open end of its outlet end 12 is installed in the cavity under the bunker 1, directed vertically upwards and connected to the fuel consumption sensor 6, the output of which is connected via a parametric generator 13 to two threshold elements 14 and 15, the output of each of which is connected to the servomotor 11 and through converters 16, 17 to the servomotor 5. Between the location of the open end of the output end 12 of the auxiliary pipeline 9 and month Compound 2 nd heat with the air supply conduit taken hydraulic resistance 7

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The device works as follows.

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The flow of angular dust fluidized in the bunker 1 through the chute 2 into the pipe 3 is accompanied by the entry of coal dust into the open end of the output end 12 of the additional pipe 9. Moreover, the level of the above-mentioned flow depends on the air flow through the pipe 9, which is controlled by the servo motor 11. in the auxiliary pipeline is determined by their speed of movement and weight, balanced by the velocity air pressure through the pipeline 9 Having established the value of the air flow , Sootvetst- uyuschee average value level, the sensor 6 can be made automatic regulation of air flow through conduits 9 and 3 (see. Fig.Z). When the flow rate of the fluidized coal dust (Ω /) decreases in the leak, the output signal (Ur) of the parametric generator also drops, as the level of coal dust entering the output end 12 decreases (Fig. 2) A) at the minimum allowable decrease in the output signal level (Ur) of the parametric generator 13, which activates the servomotors 11 and 5, which provide a reduction in the air flow in the pipelines 3 and 9. The velocity head of the air at the output end 12 decreases, due to it arrival level of coal dust in the last uvelichits the calculated value corresponding to the mean value

Reducing air (OPOS) in pipeline 3 will provide the optimum ratio of the combustible mixture entering the burner. When Qn / W increases, the reverse process occurs. The signal from the generator 13 increases, the second threshold element 15 triggers, adjusted to the minimum allowable increase in the output cell level Ur, the servomotors 11 and 5 turn on, ensuring an increase in the flow rate in the ducts 3 and 9 (Fig .2, RF mode). The control signal in this case is fed to another input of servomotors 11 and 5.

The flow sensor 6 is designed as a level indicator connected to a parametric generator as a long line, i.e. the length of the rod of the level indicator is selected commensurate with the wavelength of the parametric oscillator. In this case

the indicator rod, mounted in isolation at the center of the end of the pipe 12, in combination with its body, is a sensor whose output signal depends

the degree of filling of its length; the installation of hydraulic resistance 7 is necessary to ensure an unambiguous supply of coal dust into the pipe 12. For example, if the hydraulic resistance of the chute is incommensurably less (or equal) to the hydraulic resistance of pipeline 9, the supply of coal dust is ultimately uneven and depends on their values in the process

(changes in porosity, etc.).

The screen 8 is installed above the open end of the pipe 12 at a distance equal to 2-3 caliber of the latter to eliminate the effect of changes in the weight of the pseudo-liquid column.

Claims (1)

in the bunker 1 for the degree of filling of the pipe 12. The invention of the device for the automatic control of the air supply to the burner of the boiler unit having a bunker for coal dust with a leak, containing a fuel consumption sensor in the leak and a regulating device connected to the servomotor of the regulator installed in the air supply line to the burners, which, in order to increase the control accuracy, it additionally contains a second regulator with the servomotor installed in the additional pipeline connecting the air supply pipeline with the fuel consumption sensor, hydraulic resistance and screen installed in the coal dust chute, the fuel consumption sensor you olnen as the indicator level in the coal dust an additional pipeline, the end of which, located in the chute, is directed vertically upwards, and the regulating device is designed as a parametric generator connected to a flow sensor fuel, two threshold elements connected to the output of a parametric generator, and two converters connected to the outputs of the threshold elements and connected to the servomotor of the regulator installed in the air supply pipe to the burner, and the outputs of the threshold elements are additionally connected to the servomotor of the second regulator installed5 foot in the additional pipeline. S / r / jff g a, 9 {WHO AB FIG. 2  Sy