JPS6023857B2 - Method and device for supplying powder to a pressurized fluidized bed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the supply amount of powder and granular material, and an apparatus for carrying out the same, particularly for controlling the supply amount when powder or the like is continuously and quantitatively supplied to a reaction device under high temperature and pressure. The present invention relates to a method for controlling quantity and the structure of a device for its implementation.

It is common practice to supply powder or granules to a reactor under high temperature and pressure.

Lock hopper is such a feeding method or device.
(double discharge valve) type feeder, pu. - There are tank type feeders, etc. The lock hopper type feeder allows almost continuous transportation due to the upper and lower tanks with double discharge valves, but because it uses valves, there is severe wear and tear due to friction at high temperatures, and there are problems with the seals of the equipment. be. In addition, the blow tank type feeder is a device that seals powder and granules in a container, fluidizes them using air pressure, and feeds them into a transport pipe.It is a so-called batch type feeder, and has the disadvantage that it cannot be continuously fed. Tsubaki Sekisho 5 is a device that circulates particles between two high-temperature and high-pressure towers.
There is an invention of No. 1-32484. This equipment is used to decompose young oils. Heavy oils are decomposed in a reaction tower using a fluidized bed, and the cracked residue, particles with carbon attached, are sent to a regeneration tower, where the carbon is removed by combustion. (referred to as stripping), and the regenerated particles are returned to the reaction column. These two towers are connected by a lift pipe and an inclined pipe to form a closed circuit in which particles circulate. In this equipment, for the return of particles from the regeneration tower to the reaction tower, a sloping pipe is used that utilizes the flow of particles due to the level difference between the two towers, and the supply to the regeneration tower using a lift pipe for stripping is as described above. It is necessary to overcome the level difference and a supply of lift gas is necessary. Therefore, there is a problem in the arrangement of equipment to create a level difference between the two towers, and a problem in that a high speed gas is required to overcome the level difference by increasing the speed. As explained above, supply devices have their own problems when continuously supplying powder quantitatively to a reactor under high temperature and pressure, and it is necessary to reliably control the amount of powder supplied under high temperature and high pressure. It would have been extremely difficult to do so. This invention solves the problems seen in the prior art as explained above, and provides a powder supply control method that can be carried out in a stable state at high temperatures and under pressure, and a method for carrying out the same. The purpose is to provide equipment.

The method and device for controlling the supply amount of powder and granule according to the present invention include blowing gas into the outlet of the powder and controlling the pressure at the outlet of the powder and granule in the powder and granule supply section of a pressurized fluidized bed reactor. The gist of this is to control the amount of powder and granular material supplied by making it higher than the pressure.

More specifically, the present invention has the following features.

[1} In a method for supplying a fluidized medium to a powder fluidized bed having pressure, a column for supplying a fluidized medium capable of forming a fluidized bed pressure corresponding to the powder fluidized bed pressure at its lower part is provided, The lower part of the column is connected by a pipe to a column having a pressurized fluidized bed that is supplied with a fluidized medium, and the pressure of the lower part of the column that supplies the fluidized medium is equal to the pressure of the pressurized fluidized bed that is supplied with the fluidized medium. A method for supplying powder and granules to a pressurized fluidized bed, in which the amount of air for fluidization in a column for supplying the fluidized medium is controlled using the difference between the two as a signal, thereby controlling the amount of particles supplied to the pressurized fluidized bed.

'21 A column having a pressurized fluidized bed having a pressure, a column supplying the pressurized fluidized bed with a fluidized medium capable of forming a fluidized bed pressure corresponding to the pressure in the lower part thereof, and a column supplying the fluidized medium. a powder transport pipe connecting the lower part of the column with the column having the pressurized fluidized bed, a pipe supplying pressurized gas for fluidization to the lower part of each tower, and pressurizing the powder transport pipe. A pipe structure for supplying gas, a detection device that detects the difference between the pressure at the bottom of the tower that supplies the fluidized medium, the combined pressure of the fluidized medium, and the pressure of the pressurized fluidized bed that receives it, and a signal from the detection device that detects the fluidization. A device for controlling the supply amount of pressurized gas for fluidization supplied to the lower part of the tower for supplying the medium, a pipe line for supplying powder and granular material to the tower for supplying the fluidized medium, and each of the above. It is a device for supplying powder and granules to a pressurized fluidized bed consisting of an exhaust gas pipe from a column.

Hereinafter, a specific configuration of an embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing the structure of an apparatus for carrying out the method of the present invention, in which tower 1 is a pressure tower serving as a supply vessel for supplying powder and granules into a fluidized bed under pressure, and tower 2 is a fluidized bed under pressure. It is a layer reactor.

The granular material is supplied to tower 1 from the third supplying granular material, and
Gas A is blown into the lower part of the column through the perforated plate 4 to increase the pressure in the lower part 5 of the column 1, and the powder and granules supplied with gas B are passed through the powder and granule transport pipe 6 connecting the columns 1 and 2 to the column. Supply to 2. Gas C is supplied to the column 2 through the perforated plate 12, and the powder in the column 2 is fluidized by this gas C to form a pressurized fluidized bed. The powder and granules used in the tower 2 are discharged from the system through a powder discharge pipe 7. Also, the exhaust gas after the fluidized bed is formed is the cyclone in the column 1 for gas A. gas B and C
is exhausted through the cyclone 9 in the tower 2. The pressure difference between the pressure of the lower part 5 of the column 1 and the pressure of the pressurized fluidized bed 10 of the column 2 is detected by a pressure gauge 11 serving as a detection device, and the signal is sent to the control box 13, which controls the pressure gas provided in the gas A supply pipe. Flow control valve 1
4 to appropriately control the pressure difference, thereby making it possible to appropriately control the amount of powder and granular material serving as fluidized soot material supplied to the pressurized fluidized bed 10. Figure 2 shows that the inner diameter of the column 1 is 30 mm, and the inner diameter of the outlet 15 of the powder and granular material is 25 mm.
Part of the data obtained when transporting silica sand consisting of mosquitoes with an average grain size of 0.2 using air as the gas with a powder transport pipe 6 having an inner diameter of 25 yen. It is.

The conditions at that time were as follows: Height of static packed bed of powder and granular material in column 1: 4m Blow gas A supply rate: 0 to 11〆/h Powder transport gas B supply rate: 35〆/h.

It can be seen that the pressure in the lower part 5 of the column 1 is directly proportional to the amount of blowing gas A up to the amount corresponding to the start of fluidization of the powder (9.2/h).

Figure 3 shows the relationship between the powder supply rate and the pressure difference between the lower part 5 of column 1 and the flow rate 10 of column 2, and it can be seen that the powder supply rate and the pressure difference are directly proportional. Recognize. By implementing this invention, a constant pressure due to the depth of the fluidized bed in the column 1 and a pressure due to the gas A supplied to the column 1 are formed at the lower end of the column 1 that supplies powder and granules, and the total pressure is The pressure determined determines the amount of powder and granular material supplied to the column 2.

Therefore, stable and accurate powder supply amount control as shown in FIG. 3 can be performed. The pressure difference between the two columns is detected by a pressure gauge 11 and a control box 13, and is used as a signal for controlling the flow rate of the powder and granular material, thereby controlling the flow rate appropriately. This is because there are no problems such as fluctuations in particle flow when using a lift pipe or the like and fluctuations in resistance within the lift pipe due to fluctuations in the amount of lift gas. That is, by carrying out the present invention, it is possible to easily and accurately supply powder and granules to a high-temperature, high-pressure pressure fluidized bed, and the structure of the device is simple, and its control is easy. be.

[Brief Description of the Drawings] Fig. 1 is a diagram showing the structure and piping of the device according to the present invention, Fig. 2 is a diagram showing the relationship between the pressure at the bottom of the column 1 and the amount of blown gas;
FIG. 3 is a diagram showing the relationship between powder supply speed and pressure difference. 1... Column for supplying powder and granules to a pressurized fluidized bed, 2.
... Column with pressurized fluidized bed, 3 ... Column for combining powder and granules, 4 ... Perforated plate, 5 ...
・Lower part of tower 1, 6...Powder transport pipe, 8, 9・
...Cyclone, 10... Pressurized fluidized bed, 11
......Pressure gauge, 12...Porous plate, 13.
... Control box, 14 ... Pressure gas flow control valve, 15 ... Lower output section of tower 1. Figure 2 Figure 3 Figure 1

Claims (1)

[Scope of Claims] 1. In a method for supplying a fluidized medium to a fluidized bed of powder and granular material having pressure, a column for supplying a fluidized medium capable of forming a fluidized bed pressure corresponding to the pressure of the fluidized bed of powder and granular material at its lower part. The lower part of the column is connected by a pipe to a column having a pressurized fluidized bed that is supplied with the fluidized medium, and the lower pressure of the column that supplies the fluidized medium is connected to the pressurized fluidized bed that is supplied with the fluidized medium. Powder to a pressurized fluidized bed, characterized in that the amount of particles supplied to the pressurized fluidized bed is controlled by controlling the amount of fluidizing air to the tower that supplies the fluidized medium using the difference between the bed pressure and the pressure of the bed as a signal. Granule feeding method. 2. A column having a pressurized fluidized bed with a pressure, a column that supplies the pressurized fluidized bed with a fluidized medium capable of forming a fluidized bed pressure corresponding to the pressure in its lower part, and a lower part of the column that supplies the fluidized medium. A powder transport pipe that connects the tower having the pressurized fluidized bed, a pipe that supplies pressurized gas for fluidization to the lower part of each tower, and a pipe that supplies pressurized gas to the powder transport pipe. a detection device that detects the difference between the pressure at the bottom of the tower that supplies the fluidized medium and the pressure of the pressurized fluidized bed that receives the fluidized medium, and a signal from the detection device to supply the fluidized medium. A device for controlling the supply amount of pressurized gas for fluidization supplied to the lower part of the tower, a pipe line for supplying powder and granules to the tower for supplying the fluidizing medium, and exhaust gas pipes from each of the above-mentioned towers. A device for supplying powder and granular material to a pressurized fluidized bed, characterized in that: