JPS631631A - Pressure type powder quantitative feeder - Google Patents

Abstract

PURPOSE:To smooth a flow of powder as well as to make accurate quantitative feed performable to even the pressurization fed side, by installing a pressure feed tank, an intermediate storage tank and a feed tank all in a powder transport quantitative feed route. CONSTITUTION:This feeder is constituted of a powder pressure feed tank 1 provided with a hopper 5 at the upper part, a pressure regulating intermediate storage tank 2 provided with a bag filter 16 inside as a solid-air separator and a feed tank 3 being connected to this intermediate storage tank 2 via a rotor valve 22 and provided with a cut-out device 4 at the lower part. Thus, these tanks 1, 2 and 3 are installed in a powder transport quantitative feed passage, regulating each pressure, and the powder is transported and supplied under the specified pressure of the whole route, and that powder block preventing air can be blown in these tanks 1, 2 and 3. Therefore, a flow of powder is made smoothable and, what is more, accurate quantitative feed is performable to even the fed side in pressurization as well.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pressurized powder quantitative supply device for supplying powder into an atmosphere under normal pressure or pressurization.

Conventional technology Conventionally, to supply powder into a pressurized atmosphere, an ejector was used to push it from a powder supply tank into suction gas through a supply device such as a threaded feeder or rotary valve. .

Problems to be Solved by the Invention As mentioned above, in the conventional means using an ejector, when the pressure on the supplied side is high, the ejector has a transportation limit, and furthermore, the finer the powder grains to be transported, the more There are problems such as reaggregation of the particles themselves or agglomeration due to moisture, and accumulation in the supply tank, making it difficult to cut out smoothly.

Means for Solving the Problems Next, in order to solve the above-mentioned problems, the pressurized powder quantitative supply device of the present invention includes a pressurized powder supply tank having a hopper installed in the upper part via a valve; A solid-gas separator is installed inside, and then an intermediate storage tank is connected to the intermediate storage tank via a rotor valve for adjusting the pressure of the powder fed from the pressurized supply tank, and a cutting device is installed at the bottom. It is characterized by consisting of a feed tank and a feed tank.

Operation In the present invention, a pressurized supply tank, an intermediate storage tank, and a feed tank are placed in the powder transportation quantitative supply route, and the pressures of each are adjusted, and the powder is transported and supplied through the entire route under a predetermined pressure. Moreover, since air for preventing powder clogging can be blown into each tank, the flow of powder can be made smooth, and a fixed amount can be supplied to the pressurized supply side with high accuracy.

Example An embodiment of the present invention will be described based on FIG.

The pressurized powder quantitative supply device of the embodiment shown in Fig. 1 is mainly composed of a pressurized supply tank (1), an intermediate storage tank (2), a feed tank (3), and a cutting device (4). . A hopper (5) is installed in the upper part of the pressurized supply tank (1).
) is installed via a butterfly valve (or stop valve (6)), and a powder transport pipe (8) with a valve (7) is provided between the lower end and the intermediate storage tank (3), Further, a level gauge (9), a pressure switch QO, and a pin slider Ut- are provided on the inner wall as an air blowing device for preventing blockage, and are connected to a high-pressure air supply pipe Cl2t- via a valve.

The Shibata buoy valve (6) is activated by the empty detection of the level meter (9).
) opens, powder is introduced from the hopper (5), and the butterfly valve (6) is closed when the level meter (9) detects the level. Next, valve 0 is opened, and air for pressurization and pin slider (6) is sent by three-way valve α4. When the pressure inside the pressurized supply tank (1) reaches the preset pressure, the pressure switch QO (high pressure side) is activated, the valve port is closed, and the high pressure air supply from the high pressure air supply pipe @ is stopped. .

Here, if there is a request from the intermediate storage tank (2), the valve (7) is opened based on the request and the powder is transferred to the intermediate storage tank (2).
). When the pressure in the pressurized supply tank (1) decreases due to the pressure feeding of the powder to the intermediate storage tank (2), the pressure switch QO (low pressure side) is activated and the valve (7) closes.
The valve opening opens to introduce high-pressure air, and when the pressure rises, the valve (7) opens again and the powder is pumped out. During this time, the intermediate storage tank (2) side is charged to the valve (7) Q3.
is closed, and powder supply from the pressurized supply tank (1) is in a standby state. In the process of the above operation, when the level meter (9) detects that it is empty, the valve (G) opens to remove the internal residual pressure, and then the butterfly valve (6) opens to remove the powder from the hopper (5). be supplied with.

The intermediate storage tank (2) is equipped with a bag filter αQ as a solid-gas separator, and also houses a level meter α7), and is also equipped with an air jet pipe (to prevent blockage) in the cone at the bottom. and connect a high pressure air supply pipe to it.
It is connected through a valve (1), and a feed tank (3) is connected through a rotary valve port at the bottom. The air used when sending the powder from the pressurized supply tank (1) to the intermediate storage tank (2) via the powder transport pipe (8) is separated into solid and gas by the bag filter αG, It is discharged to the outside through the relief valve @, and the internal pressure of the intermediate storage tank (2) is kept constant. Therefore, the bag filter α1 operates under pressure and is always kept clean by intermittent backwash air from the high-pressure air supply pipe □□□ via the valve (c). The powder in the intermediate storage tank (2) is received from the pressurized supply tank (1) based on the information detected by the level meter αη, and the rotary valve (A) is driven and relieved based on the request from the feed tank (3). The pressure difference kept constant by the valve @ sends it to the feed tank (3). In addition, high-pressure air is intermittently sent from the high-pressure air supply pipe (11) to the air blow-out pipe (toward) installed inside the intermediate storage tank (2) to prevent blockages, and the powder is spouted inside to loosen the powder inside. In addition to preventing compaction, it is possible to improve the fluidity of the powder, and the air supplied at this time is passed through the bag filter αQ.
A level meter (E) is installed in the mufeed tank (3), which is discharged to the outside from the relief valve port, and a cutout device (4) is installed at the bottom of the feed tank (3). A pin slider (goods) is installed to prevent accumulation of air.
Connect the high pressure air supply pipe (G) through the valve port ■. The cutting device (4) can operate under high pressure and has a structure that seals the powder, and can prevent the powder from flowing out even if there is a pressure difference between the powder transport pipe and the inside of the tank. A so-called table feeder, which is a device having a structure and a constant volume type cutting mechanism, is used, and the amount of powder cut out can be controlled by the rotation speed of the cutting board. The powder cut out by the cutting device (4) at the bottom of the feed tank (3) is transported to the next process via the powder transport pipe by laminar pressure air from the high-pressure air supply pipe round via the flow meter G2 t-. device (2)
(in this example, the nozzle), a pressure equalizing pipe (to) is provided between the feed tank (3) and the high pressure air supply pipe (311), and the bottle feeder in the feed tank (3) is The effect of internal pressure fluctuations due to air blown out from the foundation will be reduced.

In the embodiment, high pressure is supplied through the high pressure air supply pipe Cl2 (6) (7) (to) in the pressurized supply tank (1), intermediate storage tank (2) and feed tank (3). After the blower engine, an air dehumidifying device such as a desiccant tank is installed to dehumidify the air and prevent agglomeration and accumulation of powder.

The pressurized powder quantitative supply device configured as described above can operate smoothly and continuously using methods such as sequence control. It exhibits an excellent effect when continuously supplied to a nozzle), and is made by pulverizing relatively coarse particles such as fine powder for combustion (approximately 80% of 200 mesh) into very fine particles to improve reactivity. It can be applied to the quantitative supply of various powders, including so-called ultrafine sweat particles (average particle diameter of 2 to 3 μm or less) or relatively sticky powders.

As a specific example, medium calcium carbonate (average particle size 1.7 μm
) and (11) slaked lime (average particle size s , , m ) were quantitatively supplied using a pressurized powder quantitative supply device shown in Fig. 1. At that time, a cutting device (table feeder) (
FIG. 2 shows the relationship between the rotation speed (rpm) and the cutting amount (kv'h) in 4). The cutting amount is proportional to the rotation speed of the table feeder, and the variation is within 5%, making it possible to supply a fixed amount very stably and stably spraying from the injection nozzle into the atmosphere under high pressure conditions. I can do it.

In the embodiment shown in FIG. 1, the pressurized supply tank (1
) If a rotary valve is further provided between the hopper (5) and the butterfly valve (6), the supply of powder will be further stabilized. A differential pressure switch that operates by detecting the differential pressure between the intermediate storage tank (2) and the feed tank (3) may be provided, and a solenoid valve may be provided in place of the relief valve.

Effects of the Invention The pressurized powder quantitative supply device of the present invention exhibits excellent effects as described below.

(1) It is possible to accurately and stably supply a fixed amount of powder even to a high-pressure supply part.

(11) Each of the pressurized supply tank, intermediate storage tank, and feed tank is under pressure, and an air blowing device is installed to prevent powder from clogging, and air is ejected to prevent powder from accumulating, clogging, etc. This can be done together with pressure regulation.

(Since the 1111 pressurized supply tank and cutting device are separated and connected with a powder transport pipe, the height of the entire device can be lowered compared to conventional devices, and the cutting device can be moved freely. Can be installed anywhere.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an embodiment of the present invention, and Fig. 2 shows the rotation speed and cutting amount of the cutting device when calcium carbonate and slaked lime are supplied in fixed quantities according to the embodiment shown in Fig. 1. It is a graph showing the relationship between.

Claims (1)

[Claims] 1. A pressurized powder supply tank equipped with a hopper at the top via a valve; and an intermediate storage tank equipped with a solid-gas separator inside to adjust the pressure of the powder fed from the pressurized supply tank. 1. A pressurized powder quantitative supply device comprising: a feed tank connected to the intermediate storage tank via a rotor valve, and a feed tank provided with a cutting device at the bottom thereof.