SU666229A1 - Method of automatic control of the process of washing pulp in vacuum drum filter - Google Patents

Description

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The cellulosic suspension, before noc-rvn, is diluted into the bath 1 of the vacuum filter, is diluted with circulating filtrate supplied from the collection tank by the pump 7. The signal from the cellulose concentration sensor 8 is fed to the concentration controller 9 –1 and where it is compared with the reference signal and by the mismatch form the output signal of the regulator, which is fed as a signal to the regulator 10 of the flow rate of the filtrate i

The regulator, 10 also serves as a signal from the sensor 11 of the rotary filtrate 11, which is compared with the reference signal and, after a mismatch, the control valve acts on the flow valve 12 of the circulating filtrate. The concentration of cellulose at the inlet to the vacuum filter is maintained at 1%. The signal from the sensor of the 13 level celine suspension is compared to controller 14 with the reference signal. By using a mismatch, the control is generated and applied to the electric motor.

15, which will affect the variator

16, by means of which the shaft 18 of the filter drum 2 changes the " drum speed " from the motor 17.

Signal G is proportional to the non-hardness of the cellulose determined by the laboratory by entering the vacuum filter; , as well as s1-1gkal OS. pulp washing degree settings are input to vacuum calculating unit 19, the output signal of which is used as a signal for vacuum regulator 20 The output signal of regulator 20.-, in turn, is the reference signal for filtrate level regulator 21 The signal from the vacuum sensor 22 serves to the controller 20f where it is compared with the signal of the task from the vacuum calculation unit 19 and, by error, an output signal p r otorB1y is formed to the regulator 21 of the filtrate level,

The signal from the filtrate level sensor 23 is fed to the controller 21 ,. They are compared with the signal from the controller 20 and, according to the mismatch, they form a control action that is given to the filtrate flow valve 24. The filtrate pump 25 podgazt on the evaporation station,

The alkalinity of the pulp at the inlet to the vacuum filter is determined by a sensor 26j, which is installed directly in Anna 1 of the vacuum filter. The signal from the sensor 26 is supplied to the wash water consumption calculation unit 27, where the tacles are given a pi f signal that is proportional to the degree of washing (residual alkalinity) of the pulp detected at the vacuum filter output, setting the pulp washing degree and the signal from the flow sensor 28 pulp. The signal in block 27 is compared with the signal za94

Dani with. according to the resolution, and also according to the magnitude of the cell alkaline signals from the sensor 26 and the pulp consumption from the sensor 28, an output signal is generated, which serves as a reference signal to the regulator 29 of the wash water. The signal from the wash water consumption sensor 30 is supplied to the controller 29, compared with the reference signal, and a control action is generated according to the magnitude of the error

which serves on the valve 31 of the flow rate of wash water.

The application of the method will improve the quality of products, reduce the loss of sodium sulfate from the washed pulp, reduce the consumption of chlorine pigments for bleaching, reduce the consumption of wash water, and reduce the consumption of steam for the evaporation of liquor.

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Claims (1)

Invention Formula A method for automatically controlling itpoueccoM cellulose washing on a drum vacuum filter, consisting of that the consumption of production water is measured and adjusted relative to the set values by changing the set value of the water flow depending on the pulp consumption at the inlet of the vacuum filter and the deviation from the set value of the degree Efshka (residual alkalinity) of the pulp - at the exit from vacuum filter, the concentration of delulose at the inlet to the vacuum filter - by changing the set value in the regulator, the flow rate of the working filtrate, the mass level in the vacuum filter bath - by affecting the speed vacuum filter drum and filtering level in the collection tank, affecting n; an additional mechanism, characterized in that, in order to improve the stabilization of the degree of pulp depletion, the set value of the wash water is changed depending on the measured value of coniferousness at the entrance to vacuum filter and regulate the vacuum inside the filter drum by changing the set value in the level regulator, Iltrat depending on the measured and set value of the vacuum, calculated by the specified values STI at the entrance to a suction filter, and the degree of washing of the pulp "and the output of the vacuum filter. Sources of information taken into account in the examination 1, Gusum N A. M, System for automatic control of the process of continuous washing of cellulose on vacuum filters, Proceedings of NIIAvtomatika, issue XX, Kirovokan, 1964, p. 66-74.