SU1386256A1 - Method of controlling the process of monoethanolamine cleaning of gases - Google Patents

Abstract

The invention relates to methods for controlling technological processes, can be used to automate the process of monoethanolamine gas cleaning and allow -. It does not increase the productivity of the process when the heat load changes. The scheme of the implementation of the method includes a regenerator 1, an air cooler 2 of the vapor-gas mixture, an absorber 3, a refrigerator 4 solutions, a sensor 5 of the temperature of the vapor-gas mixture at the outlet of the regenerator 1, a sensor 6 of the temperature of air supplied to the refrigerator 2, a sensor 7 of the temperature of a saturated monoethanolamine solution at the absorber 3 output , sensor 8 of the solution temperature in the cube of the regenerator 1, sensor 9 of steam consumption, solenoid valve 10, gears 11 and 12 of the air supply pressure, secondary devices 13-17, logic device 18, regulators 19 20, pneumatic control valves 21-26, pneumatic relays 27 and 28. 1-yl. (L

Description

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The invention relates to methods for controlling technological processes, can be used in the industry for the production of mineral fertilizers in automating the process of monoethanolamine gas purification in the production of ammonia, and is an improvement of the known method according to ed. St. No. 1142437.

The purpose of the invention is to increase the productivity of the process when the heat load changes.

The drawing shows the implementation of the proposed method.

The technological installation and control system contain a regenerator 1, an air cooler 2 of the gas-vapor mixture, an absorber 3, a cooler 4 solutions, a sensor 5. The temperature of the steam-gas mixture at the outlet of the regenerator 1, a sensor 6 of the air temperature supplied to the air cooler 2, a sensor 7 of the temperature of the saturated monorate nolamine solution at the outlet of the absorber 3, sensor 8 of the solution temperature in the cube of the regenerator 1, sensor 9 of the steam flow, solenoid valve 10, gears 11 4i 12 supply air pressure, secondary devices 13-17, logical Ecological device 18, regulators 19 and 20, pneumatic control valves 21-26 and pneumatic relays 27 and 28.

The method is carried out in the following way.

The converted gas with a temperature of 40 ° C is fed to the absorber 3, where carbon dioxide absorption takes place with a monoethanolamine (MEA) solution. During absorption, heat is generated, with the result that the temperature of the saturated MEA (HMEA) solution at the outlet of the absorber 3 rises to. J An increase in the NAA solution temperature is detected by the temperature sensor 7.

An increase in the temperature of the air supplied to the vapor-gas mixture cooler 2 above 16 ° C and the temperature of the gas-vapor mixture leaving the regenerator 1 above 60 ° C is detected by sensors 5 and 6 of these temperatures. Signals from sensors 5-7 come to the WTO

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The instruments 13–15, which record the values of these temperatures and convert them to the output signal corresponding to these temperatures. . Logic device 18 senses these signals and imparts a single signal to close valve 10. In this case, relay 27 provides a single signal in the form of compressed air pressure to close pneumatic control valve 21, and relay 28 gives a zero signal to open pneumatic control valves 22, 23 and 25

Simultaneously, the transformed system of the vapor – gas mixture temperature is supplied to the secondary device 17 with the control station and to the controller 19, which processes the regulating effect on the pneumatic valve 24 with correction according to the temperature of the MEA solution in the cube of the regenerator 1.

The flow in the boiler of the regenerator 1 is measured by a sensor 9, the signal of which is fed to the controller 20, which acts as a regulating influence corrected for the temperature of the air supplied to the refrigerator 2 to the valve 26.

Using the proposed method allows, under conditions of increased external heat load, to reduce the temperature in the cube of the regenerator 1 and the temperature of absorption. As a result, the corrosion rate of the tubular of the regenerator 1 is reduced, the degree of purification of the converted gas from carbon dioxide increases, and in addition, the expenditure ratio in the unit for steam decreases.

F o rm ula invention

The method of controlling the process of monoethanolamine gas purification by author. St. No. 1142437, distinguishing with the fact that, in order to increase the productivity of the process when the heat load changes, additionally regulate the consumption of steam in the cube of the regenerator and adjust it according to the temperature of the air supplied to the vapor-gas cooler.

Claims (1)

Claim The method of controlling the process of monoethanolamine gas purification according to ed. St. No. 1142437, characterized in that, in order to increase the productivity of the process when the heat load changes, the steam consumption in the cube of the regenerator is further controlled and adjusted according to the temperature of the air supplied to the refrigerator of the gas-vapor mixture. VNIIIPI Order 1446/11 Circulation 642 Subscription Custom polygr. ave, city of Uzhhorod, st. Project, 4