SU691172A1 - Method for automatically controlling operation of regenerator of saturated solution - Google Patents

Description

The purpose of the invention is to improve the accuracy of regulation and iodderling of a given amount of hydrogen sulfide at the outlet of the apparatus.

This is achieved by changing the flow rate of the circulating solution with correction to the content of hydrogen sulfide in the saturated solution, the temperature of the circulating solution and the amount of hydrogen sulfide in the desorbed gas, determined by measuring the flow rate of the saturated solution, its temperature, alkalinity, hydrogen sulfide content, and vacuum in the regenerator , flow rate and temperature of the circulating solution with further calculation of the amount of hydrogen sulfide using a measuring device.

The equation of the relationship between the hydrogen sulfide content in the regenerated absorption solution and the main process input parameters is as follows:

, + 25Dg.

  one

where C is the content of hydrogen sulfide in the regenerated solution, g / l; In - free member of a polynomial; Br coefficients for variables; Xi is the amount of a saturated solution supplied for processing to the regenerator, Xz is the alkalinity of the solution, g / l; Xs is the temperature of the saturated solution entering the regenerator, ° C; X is the content of hydrogen sulfide in a saturated solution, g / l; - vacuum in the regenerator, mm Hg. v .; Xe is the amount of the circulating solution, X is the temperature of the circulating solution entering the lower part of the regenerator, ° C.

The drawing shows the scheme of implementation of the method of regulating the operation of the regenerator.

Automatic control is performed as follows. Signals from sensors 1, 2, 3, 4, 5, 6, 7, proportional to the measured technological parameters of the process - the amount of saturated solution supplied to the regenerator, its temperature and alkalinity, the content of hydrogen sulfide in a saturated solution, the vacuum in the regenerator, the amount of circulating solution and its temperature, is fed to an analog computing device 8, where the resulting communication equation is realized. The output signal of the computing device 8. is proportional to the concentration of hydrogen sulfide in the regenerated absorption solution. This signal enters adder 9, where it is subtracted from the signal proportional to the content. -I

. .. I

69117

hydrogen sulfide in a saturated solution measured by the sensor 4. The output signal of the adder 9 is proportional to the amount of hydrogen sulfide extracted from a unit volume of a saturated solution in the regenerator. This signal is multiplied with a signal proportional to the amount of saturated solution supplied for processing, measured by sensor 1. The output signal of multiplier 10 is proportional to the total amount of hydrogen sulfide desorbed from the saturated solution per unit time (the amount of hydrogen sulfide in the desorbed gas). This signal is sent to the secondary device 11 and the controller 12, where the signal is compared with the reference; in case of a mismatch by the regulator, a command impulse to change the control action is fulfilled - with the help of the actuator 14 the amount of the circulating solution supplied through the primary gas cooler 13 to the regenerator is changed.

The proposed control system allows the main output value of the regenerator (the amount of hydrogen sulfide in the desorbed gas) to be maintained at a certain (specified) level, taking into account all the main process parameters that determine the process. This achieves the minimum required (optimal) flow rate of the circulating solution for the specific operating conditions of the apparatus, and the adjustment accuracy is improved. Any changes in the technological parameters are compensated with the help of a computing device almost immediately, without delay, which is very important when regulating the operation of inertial devices.

Claims (2)

1. A method for automatically controlling the operation of a saturated solution regenerator by separating a vacuum-carbonate desulfurization process by changing the supply of heating agent depending on the amount of saturated solution entering the regenerator, its temperature, alkalinity, and vacuum in the regenerator, in order to improve the control accuracy and maintaining a predetermined amount of hydrogen sulfide in the desorbed gas at the outlet of the apparatus, changing the flow rate of the circulating solution with correction for the hydrogen sulfide content saturated solution, the temperature of the circulating solution and the amount of hydrogen sulfide in the desorbed gas is determined emomu by measuring the saturated solution flow rate, its temperature, the alkalinity content of the hydrogen sulphide therein, the vacuum in the regenerator, flow and temneratury circulating solution dalneyschih calculating the amount of hydrogen sulfide by the measuring device. Sources of information taken into account in the examination 1. Copyright certificate USSR No. 521914, cl. B 01D 53/14, 1976. 2. USSR author's certificate number 495076, cl. B 01D 53/34, 1974. cm u I I Z