SU1286883A1 - System for automatic control of fuel feed to boiler unit - Google Patents

Abstract

The invention relates to the field of power engineering and improves the accuracy of regulation. The system contains a correcting regulator I heat load, sensor (D) 2 air mixture temperature, D 3 t-ry fuel-gas mixture at the entrance to the grinding fan (MB), D 4 turns of raw coal feeder, block 5 dynamic converters, regulator 6 tons of fuel-gas mixture at the inlet to MB, regulator 7 on the supply line of the additive to the drying agent, regulator 8 of MB loading, regulator 9 of the fuel supply in MB. The regulator 1 issues a reference signal, the regulator 8 changes the MB load until the reference signal is compensated by a change in cin-- nal 2. The regulator 6 does not enter into operation, the change in signal D3 is compensated by the signal from A 4 When the quality of the fuel changes, the D 3 signal changes, the D 4 signal remains constant, the regulator 6 processes the difference of the signals and restores the t-ru of the fuel-gas mixture at the inlet to MB at the same level. T-ra for MB does not change, the signal D 2 remains constant and the regulator 8 does not enter operation. 1 il. $ (L

Description

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The invention relates to the automation of the supply of fuel to a boiler unit equipped with direct injection dust systems with grinding fans (MB).

The purpose of the invention is to improve the accuracy of controlling the supply of fuel to the boiler with direct injection dust systems.

The drawing shows the block diagram of the proposed system for one MB.

The system contains a correcting regulator of heat load 1, an air mixture temperature sensor 2, a fuel-gas mixture temperature sensor 3 at the inlet to the MB, a raw coal feeder 4 turns sensor, a dynamic conversion unit 5, a fuel-gas mixture temperature regulator 6 the entrance to the MB, the regulator 7 on the supply line of the additive to the drying agent, the regulator 8 of the MB load and the regulator 9 of the fuel supply in MB.

The system works as follows.

Sensor 2 measures the air mixture temperature for MB before the built-in separator; the signal from this sensor determines the degree of loading of MB in the allowable temperature range.

Sensor 3 measures the temperature of the fuel-gas mixture at the inlet to MB.

The regulator 1 issues a reference signal, for example, to increase the fuel supply, the regulator 8 increases the MB load until the reference signal is compensated by a change (decrease) in the sensor 2 signal, the regulator 6 does not enter into operation, since the change The signal from sensor 3 is compensated by the signal from sensor 4 connected to controller 6. When the quality of the fuel, for example, humidity, changes, the signal from sensor 3 changes, while the signal from sensor 4 remains constant, since the revolutions of the PSU remain at the same level, controller 6 fulfills spacing s signals and restores the temperature of the fuel and gas mixture at the inlet of MB in

at the same level, while the temperature of the air mixture for MB does not change, the signal of sensor 2. remains constant and the regulator 8 does not enter operation.

Thus, the amount of fuel delivered to the boiler is determined only by the magnitude of the reference signal from regulator 1. Work MB over the entire permissible temperature range of the air mixture at mi. The minimum required additive to the drying agent expands the adjustment range of the boiler unit, increases its efficiency and ensures high precision of regulation due to the optimal MB loading, taking into account their technical condition.

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Claims (1)

Invention Formula The system of automatic control of the fuel supply to the boiler unit, which contains the load controllers with the help of raw meluples coal feeders, their fans, which are connected via inputs to the fuel adjustment controller and the air mixture temperature sensors, and to the output mechanisms to the fuel supply actuator. that, in order to improve the accuracy of regulating the supply of fuel to the boiler, the grinding fans of which have supply lines for the additive to the drying agent with regulatory bodies, it additionally contains yes turns of raw coal feeders, fuel-gas mixture inlet temperatures to the grinding fans, dynamic conversion units and temperature regulators of the fuel-gas mixture, the first regulator inputs connected to the sensors of the raw coal feeders through the dynamic conversion units, the second inputs are connected to the temperature sensors of the fuel-gas mixture, and the outlets to the regulators on the supply line of the additive to the drying agent.