SU1495333A1 - Method of controlling the process of dehydrogenation of hydrocarbons in fluidized catalyst bed - Google Patents

Abstract

The invention relates to the automation of reaction processes in a fluidized bed of a catalyst and can be used in the chemical and petrochemical industry, for example, in the production of isoprene and divinyl. The aim of the invention is to increase the yield of the target product. The method involves controlling the temperature of the raw material after the furnace by varying the supply of fuel gas to the furnace with temperature correction in the lower part of the fluidized bed of catalyst in the reactor, controlling the temperature in the upper part of the fluidized bed of catalyst in the reactor by varying the supply of carrier gas to the catalyst flow line from the regenerator to the reactor with a correction for the temperature in this line and the regulation of the feed of the raw material to the furnace is inversely proportional to the difference between the measured and the set pressure values of the contact aza. 1 il.

Description

one

(21) 4301521 / 23-26V

(22) 08/31/87

(46) 07.23.89. Bul Number 27

(72) B.R. Tuchinsky, V.A. Mironov,

G.I. Buckwheat, Yu.I. R zanov

and Yu.N. Tuybarsov

(53) 66.012.52 (088.a)

(56) Copyright certificate of the USSR № 952832, cl. C 07 C 5/32, 1981.

USSR Author's Certificate No. 1392067, cl. C 07 C 5/32, 1986.

(54) METHOD FOR MANAGING THE PROCESS OF MOVING HYDROCARBONS IN THE CATALYST BOILER LAYER

(57) The invention relates to the automation of reaction processes in a fluidized bed of a catalyst and can be used in the chemical and petrochemical industries, for example, in the production of isoprene and divinyl. The aim of the invention is to increase the yield of the target product. The method involves controlling the temperature of the raw material after the furnace by varying the supply of fuel gas to the furnace with temperature correction in the lower part of the fluidized bed of catalyst in the reactor, controlling the temperature in the upper part of the fluidized bed of catalyst in the reactor by varying the supply of carrier gas to the catalyst flow line from the regenerator to the reactor with a correction for the temperature in this line and the regulation of the feed to the furnace is inversely proportional to the difference between the measured and the set pressure values th gas. 1 il.

g

cl

The invention relates to the automation of reaction processes carried out in a fluidized bed of catalyst circulating in a reactor-regenerator system, and can be. used in the chemical and petrochemical industries, in particular in the production of isoprene and divinyl.

The aim of the invention is to increase the yield of the target product.

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

The dehydrogenation process is carried out in a fluidized bed reactor 1 with a fine catalyst, which is continuously circulated through the regenerator 2 to restore its properties. After being preheated in a furnace, CJ is fed to the reactor by a gas stream from bottom to top towards the descending catalyst particles. The dehydrogenation reaction is endothermic and is carried out by the heat transferred to the reactor with a catalyst.

and raw materials.

The process control system includes temperature sensors 4 and 5

four

with sd oo

CA5 00

respectively, in the upper and lower parts of the fluidized bed of the catalyst in the reactor, the feed data sensor 6, the temperature sensor 7 after the furnace, the temperature sensor 8 and the valve 9 on the catalyst flow line from the regenerator to the reactor, valves 10-12 respectively on the supply lines transporting gas to the catalyst flow line from the regenerator to the reactor, sf and fuel gas in the furnace, feed supply controller 13, feedstock temperature controller 14 after the furnace, temperature controller 15 in the upper part of the fluidized bed of catalyst in the reactor unit 16 orrektsii catalyst feed to the reactor unit feed 17 temperature correction, an adder 18, the correction unit 19 of the conveying gas supply, the correction unit 20 and the feed sensor 21, the contact pressure gas.

The method is carried out as follows.

Using the controller 13 for measuring from sensor 6, regulate the supply of raw materials to the impact on valve 11. Using controller 14 to measure from sensor 7, regulate the temperature of the raw material after the furnace by acting on valve 12. Using the unit .17, measure from sensor 5 to correct setting the controller to 14, for example, according to the PID law.

Using the unit 16 on the measurement from the sensor 6 corrects the position of the valve 9 on the flow line from the regenerator to the reactor 1 is proportional to the flow of sf.

The controller 15 measures the temperature in the portion of the catalyst bed in the reactor 1 by measuring through sensor 4 in the valve 10 (control by off-reference) through the adder 18. Using the block 19 on the measurement from the sensor 8 through the adder 18 on the valve 10 (control perturbation), for example, according to the following law:

and -K T,

where is t

derivative temperature in the flow line by TH1) change. K - coefficient. With the help of unit 20, measurement from sensor 21 corrects the assignment of controller 13 to the law:

for example, if the following P P

bum

zaA

G -.6 (if

five

0

five

0

five

0

five

0

five

0

where g

- task for the supply of raw materials;

Gg constant constituting

ask J

P is the contact gas pressure measured by sensor 21, s / is the coefficient. The value is chosen depending on the characteristics of the process and equipment and operating conditions. For the process of dehydrogenating isopentane, 0.5-0.6 kg / cm isoamylene.

Temperature control for maintaining the necessary heat-supply to the lower part of the fluidized bed of the catalyst ensures the required temperature conditions along the height of the catalyst bed in the reactor. The introduction of temperature correction in the flow line improves the quality of temperature control in the upper part of the fluidized bed of the reactor due to the operational compensation of disturbances according to the temperature of the catalyst coming from the regenerator. Correcting the supply of raw materials, taking into account undesirable overestimations of pressure of the contact gas, arising during unstable operation of the next 1x compressor units, deterioration of the cooling unit and others, makes it possible to avoid unnecessary losses. All these factors increase the yield of the target product on the missed raw materials by 0.25 rel.% And on decomposed raw materials by 0.4 relative%.

Claims (1)

Invention Formula A method for controlling the process of dehydrogenating hydrocarbons in a fluidized bed of a catalyst circulating in a reactor-regenerator system, including the regulation of the supply of cf. furnace, temperatures in the upper part of the fluidized bed of catalyst in the reactor by changing the supply of transporting gas to the catalyst flow line Raw material Compiled by G. Ogadzhanov Editor N. Rogulich Tehred M.Hodanich Proofreader E. Lonchakova Order 4210/23 Circulation 352Subscription VNIIPI State Committee on Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. on f o npecct / t 8 deduction