SU1216570A1 - System for automatic control of waste combustible gas flame burning process - Google Patents

Description

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The invention relates to the automation of the combustion process of hydrocarbon gases in the flares of oil refining, petrochemical and other industries.

The aim of the invention is to improve the accuracy of controlling the combustion process.

The drawing is a schematic diagram of the automatic control system.

Pipeline 1 to the flare shaft 2 receives waste combustible gases, and pipeline 3 supplies water vapor. A steam flow sensor 4 is installed on line 3, which is connected to a steam flow controller 5, the output of which is connected to a control valve 6. A flow rate sensor 7 of combustible gases is mounted on line 1. Near the flare shaft 2, sensors of heat separation 8 are installed, connected via a normalizer to converters 9 with a maximum signal extraction unit 10, a minimum signal extraction unit 11 and a first adder 12. The inputs of the first adder are connected to the outputs of the maximum signal extraction unit 10 and a minimum selection unit 11 signal. The output of the first adder 12 is connected via a block 13 di (1x1) differentiation and directly to the inputs of the second adder 14, and the output of the latter is connected to an extreme regulator 15. The second input of the extreme regulator is connected to the sensor 7 for combustible gas consumption, and the output to the regulator 5 steam consumption.

As separate blocks of the system, blocks of the aggregate complex of the type AK7SR or another similar complex can be used.

The automatic control system works as follows.

Exhaust combustible gases through pipeline 1 are directed to a flare barrel 2. Through pipeline 3, water vapor is supplied to the upper part of the barrel to ensure smoke-free and complete combustion of gases. The flow of water vapor is measured by the steam flow sensor 4 and controlled by the steam flow controller 5 by means of the control valve 6. The gas flow is measured by the sensor 7. The signals of the heat gap sensors 8 (for example, thermocouple) are symmetrically located

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in the upper part of the flare shaft at some distance from the burning zone, they go to the corresponding inputs of the normalizing transducers 9,

The output signals of the normalizing transducers are fed to the corresponding inputs of the maximum signal extraction unit 10, the unit 11 for separating the minimum signal and the first adder 12,

The output signals of blocks 10 and 11 are equal to € 1, respectively, the maximum and minimum values of the signals

15 sensors of the heat gap are fed to the negative inputs of the first adder 12.

The output signal of the first adder 12 is fed to the input of block 13

20 differentiation and the first input of the second adder 14, to the other input of which the output signals of block 13 arrive. The output signal of the second adder 14 is fed to the input of the extreme regulator 15, to another input of which signals of the gas flow sensor 7 to the flare shaft are received.

during start-up, operation

30 or in case of emergency shutdown of technological installations, the need arises to promptly burn large quantities of the resulting carbon- hydrogen gases. For this, the gases are sent to the flares where they are burned. To ensure safety and environmental protection, the gas burning process must be smokeless and the combustion itself must be complete. This is ensured by the supply of a certain amount of water vapor to the combustion zone.

When exposed to wind or precipitation, the flame plumes deviate accordingly. At the same time, the sensor closest to the flame generates the maximum heat release signal, and the most distant from the flame - the minimum signal. It is not possible to use one of these signals in the regulation, since they are unreliable. In addition, each sensor has a certain degree of inertia, which also reduces the accuracy and efficiency of regulating 55 or steam consumption.

To eliminate these drawbacks, the maximum and mini 35 signals are subtracted from the sensor signals.

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minimum values, the subsequent differential accuracy and reliability of the adjustment and summation of half-lirova.i steam consumption,

signal and its increments. When controlling the flow of water

At the same time, the steam supplied to the torch significantly increases, the economic accuracy of the information is eliminated;

c, the inertia of the sensors and the influence of the decrease in the total steam consumption under the weather conditions (wind, precipitation, a certain period of time pressure) on the combustion process, which does not.

Claims (1)

SYSTEM OF AUTOMATIC CONTROL OF THE TORCH FLAME COMBUSTION PROCESS OF FUELING GASES, containing flame heat radiation sensors connected via standard converters to the maximum signal extraction unit, and an extremal regulator connected by a gas flow sensor and a steam flow rate regulator, characterized in that the accuracy of regulation, it contains a block extraction of the minimum signal, two adders and a differentiation unit, and the inputs of the block selection of the minimum signal are connected to moves normalizing converters, and the output of the first adder, the inputs of which are connected to the output of the maximum block selection signal and outputs normalizing converters, and to output - _with a first input of the second adder and through block differentsirs- S Bani second input of the second adder, the output of the latter is connected with extreme regulator. SU „„ 1216570>