SU1283246A1 - Method for controlling hydrogenation process - Google Patents

Abstract

The invention relates to the control of hydrogenation processes, can be used in the refining industry and allows to increase the yield of the target product, as well as to reduce the consumption of hydrogen-containing gas. The method is implemented by control loops. Temperature control loop by changing the fuel supply to the furnace 3 sensor 7 (D), controller 8 (P), actuator (MI) 9, control loop of the ratio of raw materials and gas consumption, including D 11 and 12 raw materials and hydrogen-containing gas, D 13 and 14, concentrations of sulfur and hydrogen in hydrogen-containing gas. Signals D 11, 12, 13 and 14 through the computing unit 16 and the modeling unit 17 enter the optimizer 18, the output of which changes the tasks P 8 and 19. The latter acts on the IM 20 on the line of hydrogen-containing gas. 1 silt, 1 tab. (L

Description

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The invention relates to the automatic control of hydrogenation processes and can be used in the refining and petrochemical industries, for example in a hydrotreating unit for petroleum fractions.

The aim of the invention is to increase the yield of the target product and reduce the consumption of hydrogen-containing gas.

The drawing shows a schematic diagram of the control system of the hydrogenation process.

The feedstock and hydrogen-containing gas flows through pipelines 1 and 2 are mixed at the entrance to furnace 3 where they are heated to a predetermined temperature. The gas-raw material mixture is sent via line A to reactor 5 where the hydrodesulphurisation of the raw material takes place. The reaction products through pipeline 6 enter the separation unit.

The temperature of the gas-raw mixture at the inlet to the reactor is measured by the sensor 7 and is controlled by means of a regulator 8, the outlet of which is connected to a valve 9 installed in the fuel supply pipe 10 to the furnace

The consumption of raw materials and alga-containing gas is measured by sensors II and 12, respectively, the sulfur concentration in the raw materials and hydrogen in hydrogen-containing gas are respectively sensors 13 and 14. Signals from sensors 11, 12 13 and 14 go to EBM 15 to the computing unit 16. block 16 and the signal from the sensor 7 is received on. the input of the simulator 17, the output of which is entered by the optimizer 18,

The output signals of the optimizer 18 are supplied to the chambers for setting the regulator 8 and the regulator 19 for the ratio of the flow rates of cf and hydrogen-containing gas. The output of the regulator 19 is connected to a valve 20 on the line of hydrogen-containing gas.

The method is carried out as follows.

In block 16, the ratio X, the concentration of sulfur in the raw material and hydrogen in the hydrogen-containing gas and the ratio x of the flow rate of SF and hydrogen-containing gas are calculated.

. Signals proportional to the floor

values of x. their.

and

1 i the signal from sensor 7, proportional to the value x of the raw material temperature at the reactor inlet, is fed to the input of the modeling unit 17, which processes the control model of the process

, g:

L

2

 f (x

X

but

) x;

where u

I

Have a target

- the sulfur content in the product,

the yield of the target product. The resulting process model is entered into the optimizer 18, which determines the values of and x, ensuring the maximum y

given value of y

1 x,

and we know

The calculated optimal values of the control variables x and x are set on the object by introducing them into the chambers of the tasks of the controllers 8 and 19.

The technical and economic effect of applying the proposed method is to increase the efficiency of the process by increasing the selection of the target product and reducing the consumption of hydrogen-containing gas, which is achieved by changing the raw material temperature at the reactor inlet, and the cost ratio raw materials and hydrogen-containing gas, depending on the ratio of the sulfur concentrations in the raw materials and hydrogen in the hydrogen-containing gas.

The efficiency of the method is confirmed by the table obtained after treating 5 tons of vacuum gas oil (fraction 350-500 ° C) on an alum-nickel-molybdenum catalyst.

Indicators

Way

50

Known - Suggested Hygiene

55

Raw material temperature

at the entrance to

reactor, ° C

Value for money and

hydrogenous

gas, nm / ms

The sulfur content in the target product, wt.%

The yield of the target product,%

Claims (1)

Invention Formula The method of controlling the hydrogenation process by adjusting 20 - 20 832464 the raw material temperatures at the reactor inlet by changing the fuel supply to the furnace and the ratio of raw material consumption and hydrogen containing gas at the furnace entrance by changing the hydrogen-containing gas supply, characterized in that, in order to increase the yield of the target product and decrease the hydrogen-containing gas the raw material and the concentration of hydrogen in the hydrogen-containing gas, calculate their ratio and regulate the temperature of the raw material at the entrance to the reactor and the ratio of the costs of the raw material and the hydrogen-containing gas at the entrance furnace depending on the calculated ratio of the concentration of sulfur in the feedstock and the hydrogen concentration in the hydrogen gas. Sh 15