SU1392067A1 - Method of controlling process of dehydrogenation of hydrocarbons in fluidized bed of catalytic agent - Google Patents

Abstract

The invention relates to the automation of reaction processes carried out in a fluidized bed of a catalyst, in particular for the production of isoprene and divinyl, and can be used in the chemical, petrochemical and other related industries. The purpose of the invention is

Description

Contact gas

Regeneration gases

ABOUT)

Toplibma gas

13

The increase in the productivity of the process by the target product and they are the specific consumption of raw materials and energy. The process control system includes sensors (D) 3.4 flow rates of the raw material to the reactor and fuel gas to the regenerator, valves (K) 5.6 supplying the carrier gas to the catalyst flow line from the regenerator to the reactor and top

gas into the regenerator, valve 7 on the catalyst flow line from the regenerator to the reactor, analyzers 8.9 of the raw material composition and oxygen content in the regeneration gases, air flow controller 10, blocks (B) I, 12 adjust the air flow and temperature control in the reactor D 13 temperatures, B 14 corrections, D 15 air flow and K 16. 1 Il.

I

The invention relates to the automation of reaction processes carried out in a fluidized bed of a catalyst, in particular for the production of isoprene and divinyl, and can be used in the chemical, petrochemical and other related industries.

The purpose of the invention is to increase the productivity of the process for the target product and lower the specific consumption of raw materials and energy resources.

The drawing shows a schematic diagram of a control system implementing the proposed method.

The dehydrogenation process is carried out in a reactor with a fluidized bed of an alumina chromium catalyst continuously circulating through the regenerator 2. In the reactor, the catalyst partially loses its properties (coking and reduction reactions take place). In the regenerator 2, the catalyst is oxidized to the necessary degree by the oxygen of the air supplied to the regenerator, and the coal is burned out at a high temperature supported by compression of the fuel gas.

The process control system includes sensors 3 and 4 of the flow rate of the raw material to the reactor and fuel gas to the regenerator, valve 5 for supplying carrier gas to the catalyst flow line from the regenerator to the reactor, valve 6 for supplying fuel gas to the regenerator, valve 7 on the catalyst flow line from regenerator into the reactor, analyzer (chromatograph) 8 composition of the raw material, analyzer 9 oxygen content in regeneration gases, air consumption regulator 10 in the regenerator, air consumption correction unit 11, temperature control unit 12 s in the reactor with the sensor 13 and the correction unit 14 the catalyst flow from the regenerator to the reactor. In addition, the system includes a sensor 15 air flow in the regenerator 2 and the valve 16,

The method is carried out as follows.

By means of block 12, the temperature in reactor 1 is measured by measuring from sensor 13 by acting on valve 5 or 6, depending on the control stocks.

 Using the controller 10, the input of which receives a signal from the sensor

15, regulate the flow of air into the regenerator 2, affecting the valve

16. With the help of block 11, adjust the task to the controller 10 as follows

-SAA

 G; + K, GT.r - b. ,

(one)

de i

max j

, "Mqxc-" max

K, (C-C), if С С

oh if

- constant air flow component;

oxygen concentration

in regeneration gases, measured with sensor 9;

permissible oxygen concentration in regeneration gases;

. - fuel gas consumption

measured by sensor 4;

K,. K - tuning factors With the help of correction (1) the air supply is required for burning the fuel gas and the required degree of oxidation of the catalyst. Using the measurement unit 14-measurement from sensors 3 and 8, the amount of the initial product in the raw material is determined as the product consumption of concentration and adjust the position of the valve 7 in proportion to this quantity. The flow cross section of the flow of the catalyst and the regenerator to the reactor thus provided

reactor temperature regulation in perturbation.

The implementation of the proposed method provides an efficient mode of catalyst regeneration, preventing its re-oxidation and providing the necessary burnout of coke deposits. In addition, the method makes it possible to efficiently carry out the dehydrogenation process under the conditions of varying loads on raw materials and fluctuations of its composition due to the high quality of maintaining the required temperature conditions.

The introduction of the proposed method into industrial production allows, by improving the quality of maintaining the temperature regime, to increase the performance of the target product.

product by 0.15 rel.% and reduce the specific consumption of raw material by 0.25 rel.%, and by providing a more efficient regeneration mode, reduce the specific consumption of fuel gas by 0.5 rel.%.

Claims (1)

Invention Formula A method for controlling the process of dehydrating hydrocarbons in a fluidized bed of a catalyst circulating in a regenerator reactor system, including regulating the temperature in the reactor by varying the supply of carrier gas to the catalyst flow line from the regenerator to the reactor or fuel gas to the regenerator, regulating the air supply to the regenerator and the catalyst to the reactor It turns out that, in order to increase the productivity of the process for the target product and to reduce the specific consumption of raw materials and energy, the consumption and composition of the raw material are measured inversely with the oxygen content in the regeneration gases, the measured amounts of feed and composition of the raw material determine the amount of feed in the feed and adjust the catalyst feed to the reactor in proportion to the feed the regenerator is controlled in proportion to the consumption of fuel gas in the regenerator and oxygen in the gases of regeneration.