SU1137250A1 - Compressor control method - Google Patents

Abstract

METHOD yilPABJffiHHH with a COMPRESSOR by measuring the gas flow rate from the compressor and acting with the regulator on the throttle position set at the compressor inlet, by the difference of the signal from the gas pressure sensor at the compressor output and the correction signal, which is regulation in the gas processing flow diagrams additionally measure the pressure and temperature of the gas at the consumer, depending on the measured temperature and given constant values, determine the requirement The desired gas pressure value from the consumer determines the difference between the required and measured gas pressure values from the consumer, compares the measured gas flow rate with the specified limits, and when the gas flow rate is within the specified limits, the difference between the required and measured gas pressure values is used as the correction signal the consumer, the value of the gas flow increased by iEm, taken with a given coefficient, with a gas consumption value less than the specified limits, is the measured value Flow rate of gas taken along a predetermined coefficient, and a value greater than predetermined limits, - the measured value of the gas flow, taken along a predetermined coefficient and reduced by a predetermined constant, value.

Description

The invention relates to the regulation of compressors installed in gas processing flow diagrams. A known method of controlling a compressor is by measuring the gas flow rate at the outlet of the compressor and the effect of the regulator on the t position. throttle valve installed on the compressor inlet by the difference signal of the gas pressure sensor at the outlet of the compressor and the correction signal Q However, this method does not provide the required quality control. The purpose of the invention is to increase the quality of regulation in gas processing flow diagrams. This goal is achieved by the fact that according to the method of controlling the compressor by measuring the gas flow rate at the outlet of the compressor and acting on the throttle valve position, established at the compressor inlet, by the difference of the signal of the gas pressure sensor at the outlet ji3. the compressor and the correction signal, additionally measure the pressure and temperature of the gas at the consumer, depending on the measured temperature and specified constant values, determined: the required value of the gas pressure at the consumer, determine the difference of the required and measured gas pressure at the consumer , compare the magnitude of the measured gas flow with the specified limits, and finding the value of the gas flow in the outside limits as a correction signal using the pull of the required and measured flow rate gas pressure at the consumer increased by the measured value of the gas flow, taken with a given factor, with a gas flow value less than the target limit, the measured gas flow rate taken with a given factor, and with a value greater than the specified limits, measured the value of the gas flow taken with a given cozfficeite and reduced to a fixed constant value. Figure 1 presents the block diagram of the device that implements the method; Fig. 2 is a graph of output of block signals from gas flow. The device for controlling compressor 1 contains a pressure regulator 2, a pressure sensor 3 at the outlet of the compressor, a flow sensor 4, a throttle valve drive 5, a pressure sensor 6 and a gas temperature sensor 7 at the consumer (load 8), the first functional converter 9, the comparison unit 1O, the memory element 11, the second functional converter 12, the multiplication unit 13 and the adder 14. The method is implemented in the device as follows. When using the proposed method in gas separation installations using the method of low-temperature distillation, the criterion for controlling the load 8 is a constant degree of product recovery (for example, propane) from the gas, while maintaining the efficiency of compressor 1 within predetermined limits. In this case, the dependence of the gas pressure on the consumer (in the load) for a given extraction coefficient is approximated by a linear function: t + b. where P is the required gas pressure value at the consumer; i t is the gas temperature at the consumer; k, b are approximation coefficients depending on a given extraction coefficient. According to this dependence and the flow rate, a correction signal is generated for the pressure regulator 2, acting on the throttle actuator 5 on the signal. pressure sensor 3 at the outlet of the compressor. The magnitude of pa: descent is measured by sensor 4, from the output of which the signal goes to a multiplier 13, at the output of which a signal is formed: Y, m.Q, where y. - output block multiplicative; C - gas consumption; m is the given coefficient. Sensors 6 and 7 generate signals that characterize the actual pressure and temperature of the gas at the consumer, and the measured gas temperature in the first functional transducer 9 determines the required gas value of the consumer B depending on the given coefficients .k, b, and also forms a signal proportional to the difference between the required and measured gas pressure values. In this case, the dependence of the output signal of the first functional converter on the flow rate can be represented as: yj - VQ + ь, where y is the output signal of the first - functional converter; . Q - gas consumption; kafb.2 - coefficients. The signal y t formed on the course of multiplier 13 enters the second functional converter 12, at the output of which the dependence is implemented: -k.Q-H bj. if, “imi, i-Q L-kj-Q + b k id - а.„). . if (l.,, where y is the output signal of the second functional converter; Q is the gas flow variation limit & k-.b are coefficients. From the output of the second functional converter, the signal arrives at the comparison unit 10 through the memory element 11 implementing delaying the signal by a few seconds, which corresponds to the gas flow time from the flow sensor 4 to the pressure sensors and gas temperature at the consumer. In case the measured flow rate is less than the specified limits, the reference signal is the good signal from the smart unit If the measured flow rate is greater than the specified limits, the target signal is the output of the multiplier block, increased by a constant Bejra4HHy. This allows the setpoint to be adjusted by the pressure controller according to the load control criterion, for example, according to the recovery factor of the product and provides the compressor from disturbances in its normal operation as a result of accidental violations of the process conditions in the load, since when the flow rate aa leaves the specified limits The load on the compressor is automatically terminated. Thus, an additional measurement of the pressure and temperature of the consumer, determining the required pressure value by the gas temperature, determining the difference between the desired and measured gas pressure from the consumer and applying a correction signal depending on the values of the measured flow rate allows there is no need to improve the quality of regulation in technological schemes for gas processing by maintaining the criteria for controlling the load on a given m4 value,

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Claims (1)

COMPRESSOR CONTROL METHOD by measuring the gas flow rate at the compressor outlet and the regulator acting on the position of the throttle valve installed at the compressor inlet, by the difference of the gas pressure sensor signal at the compressor outlet and the correction signal, characterized in that, in order to increase the quality of regulation in technological schemes for gas processing additionally measure the pressure and temperature of the gas at the consumer, depending on the measured temperature and the given constant values, determine the desired gas pressure value at the consumer, the difference between the required and measured gas pressure values at the consumer is determined, the measured gas flow rate is compared with the specified limits, and when the gas flow rate is within the specified limits, the difference between the required and measured gas pressure values at consumer, increased by the measured value of the gas flow rate, taken with a given coefficient, when the gas flow rate is less than the specified limits, the measured value of consumption and the gas, taken with a predetermined coefficient, and a value greater than predetermined limits, - the measured value of gas flow rate, taken with a predetermined coefficient and reduced to a predetermined constant value. FieL 1137250: 1 . 1137250