JPS5838786A - Method and apparatus for heat-treatment of heavy oil - Google Patents

Abstract

PURPOSE:To prevent the clogging of the heat treatment apparatus, and to improve the accuracy of flow control, by supplying a reaction vessel with heavy oil while increasing the flow rate of the oil with time according to the residence time distribution of the oil in the vessel. CONSTITUTION:The solenoid valves 18, 20 are closed and the solenoid valves 8, 17, 19 are opened to transfer the heavy oil stored in the tank 6 to the metering pipes 9, 10, and the solenoid valves 8, 17, 19 are closed. The solenoid valve 18 is opened, and the heavy oil in the metering pipe 9 is transferred to the vessel 15 through the flow path 11. The opening of the flow control valve 13 is increased with time by the control means 23 according to the liquid level in the metering pipe 9 which corresponds to the rate of the oil flowing into the vessel 15. By this process, the clogging of the apparatus with the heavy oil can be prevented, and the accuracy of the flow control is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for heat treatment of heavy oil, which can be suitably carried out, for example, in a real eyelid chamber.

In the specification d of this case, the term "heavy oil" refers to a liquid whose viscosity increases when heated, and has a boiling point of about 3506 C or more, such as so-called petroleum heavy oil or coal-based heavy oil. is included.

When constructing a chemical reaction plant, it is necessary to understand the product properties and yield under the operating conditions in advance. Therefore, it is necessary to construct a small-scale experimental plant and collect data.

However, when carrying out heat treatment reactions of heavy oil, particularly reactions involving slurry, in a continuous manner, if the experimental equipment is downsized, problems such as clogging of product extraction pipes occur as described below. In other words, if the 70-flow filter is made small in order to obtain the heavy oil flowing out from the continuous heating mixing tank as a sample in the eyelid chamber, when the heavy oil is heated at a temperature that causes coking, lumpy solids will flow. They tend to block the tract. Therefore, there is a problem that the product extraction pipe cannot be made very small, and as a result, the amount of waste to be processed for raw materials, products, etc. increases.

The object of the present invention is to obtain heavy oil having the same properties as the heavy oil discharged from a continuous heating mixing tank without clogging the flow path even in a small amount. The purpose is to understand the method and equipment for heat treatment of quality oil.

@1 Figure is a simplified diagram-C of the continuous heating mixing tank 1.

Heavy oil is supplied to the tank body 2 from a flow path 3.

The heavy oil heated by the heating device 4 flows out from the flow path 5, and the residence time distribution of the heavy oil in the flow path 5 in the two constant chambers is as shown in tL in FIG. The residence time distribution E(θ) is expressed by the following equation.

Sh.

E(θ)=44...(1) θ Here, e is a natural number, and θ represents "-" at the time of average retention. It is possible to obtain heavy oil having a residence time distribution shown in .

FIG. 3 is a system diagram of one embodiment of the present invention. Heavy oil, which is a raw material, is stored in a tank body 6, and is passed from a flow path 7 to a solenoid valve 8, and from a metering pipe 9.10 to a flow path 11. pump 12,
It is supplied to a container 15 via a flow rate control valve 13 and a flow rate 14. The container 15# is heated by a heating means 16 and is equipped with a stirring blade 27. Measuring pipe9. IO is linear and extends vertically, and electromagnetic valves 17, 18, 19, 20 for opening/closing control are provided at the inlet and outlet of the metering pipe 9j10. d The liquid levels of the measuring pipes 9 and 10 are detected by the liquid level detection means 21 and 22, respectively. The cross-sectional area perpendicular to the axis of the metering pipe 9 is selected to be smaller than the cross-sectional area perpendicular to the axis of one pipe 10 in total. Solenoid valve 8, 17° 18. 19, 20, flow control valve 13
and a control hand 23Vi provided in connection with the liquid level detection means 21, 22, which controls the heavy oil in the container 6 at the end of the reaction so that it is supplied to the container 15 with the flow rate change shown in FIG. .

The curve shown in FIG. 4 is a graph in which the time course of the residence time distribution curve shown in #I; 2 is reversed. Initially, the solenoid valves 8, 17.1 are closed while the solenoid valves 18, 20 are closed.
Heavy oil from the tank body 6 flows into the metering pipes 9 and 10 surrounding the tank 9, and then the solenoid valves 8 and 17 and 19 are closed. Then, the solenoid valve 18 is opened, and the heavy oil in the metering pipe 9 flows into the container 15 through the flow path 11. The liquid level in the measuring pipe 9 is
It corresponds to the flow rate of heavy oil flowing into the container 15, and the opening degree of the control means 23#i flow rate control valve 13 is adjusted over time so that this current follows the time course shown in FIG. control so that it changes greatly accordingly. Until time t1 when the flow rate is less than a relatively small value 8, heavy oil from the metering pipe 9 is introduced into the container 15.

In this way, before the time t1 when the flow rate of the heavy oil flowing into the container 15 is relatively small, the liquid level of the metering pipe 9 having a small cross-sectional area perpendicular to the axis is detected, and the change in the liquid level is caused by the heavy oil The flow rate is controlled with high precision.

After time [1], the solenoid valves 17 and 18 are closed and the solenoid valve 20 is opened. As a result, heavy oil flows from the metering pipe 10, which has a large cross-sectional area perpendicular to the axis, into the container 15 via the flow path 11. In this way, at time t2, the flow rate of heavy oil supplied to the container 15 is determined to be the desired value, and the pump 12 is stopped and the solenoid valves 18 and 20 are closed.

As described above, according to the present invention 1, heavy oil is supplied in a container according to the residence time distribution while the flow rate thereof increases as the time elapses. As mentioned above, there is no risk of clogging due to heavy oil. In addition, the flow rate of heavy oil supplied to the container is stored in the metering pipe, and the flow rate of heavy oil supplied to the container is controlled according to changes in the liquid level, so the flow rate of heavy oil is 7. The accuracy of control can be improved.

[Brief explanation of the drawing]

Figure 1 shows continuous heating and mixing N! FIG. 2 is a graph showing the residence time distribution of heavy oil in the continuous heating mixing tank IK, FIG. 3 is a system diagram of an embodiment of the present invention, and FIG.
2 is a graph showing the flow of heavy oil supplied to 1... Continuous heating mixing tank, 4, 16... Heating means, 8
゜17.18, 19.20...Solenoid valve, 9.10...
- Meter lid pipe, 12... Pump, 13... Flow rate control valve, 15... Container agent Patent attorney Kei Nishi Department Figure 1 Figure 2 Retention 1 mound (θ)

Claims (1)

[Claims] [1] According to the residence time distribution of the heavy oil in the continuous heating mixing tank, the flow rate of the heavy oil is changed greatly over time, and the heavy oil is poured into the heated container. A method for heat treatment of heavy oil, characterized by supplying and holding in a container until the supply operation is completed. (2) Means for detecting the liquid level of the metering pipe, which includes a metering pipe, a pump, and a flow ffl4 control valve extending vertically in the middle of the route of heavy oil to a heated container; Means for controlling the opening degree of the flow rate control valve to a large extent over time in response to the detection output from the position detection means so that the flow rate for each residence time follows the residence time distribution of heavy oil in the continuous heating mixing tank. A heavy oil heat treatment device comprising: