JPS5819569B2 - Continuous supply and discharge equipment for high temperature powder - Google Patents

Description

[Detailed description of the invention] Powders such as iron powder, sand, silica sand, quicklime, and chamotte that are handled in chemical reaction devices such as fluidized beds generally coexist with high-temperature gas, etc., and the powders are transferred from one reaction device to another. If the gas is to be fed to another reactor, the high-temperature gas will also be discharged.

Therefore, in the reactor on the powder supply side, a device is required that leaves the high-temperature gas as it is and continuously takes out only the powder in a fixed amount from the system.

It is conceivable to use a cone valve in such a device for continuously quantitatively taking out high-temperature powder.

As a requirement for cone valves (1) It must be heat resistant since it handles high-temperature powder.

(2) High temperature gas must be sealed and not taken out of the system.

(3) Powder can be taken out continuously.

(4) The amount of powder taken out can be adjusted automatically.

(5) It must be able to follow pressure fluctuations within the reactor.

(6) It has a simple structure and can be provided at low cost.

Examples include.

This invention was made in light of these points of view, and has excellent heat resistance, a long life, and the ability to continuously take out only the powder, as well as automatically adjust the amount taken out. The object of the present invention is to provide a continuous feeding/discharging device for high-temperature powder that can follow pressure fluctuations within a reactor very well, has a simple structure, and can be provided at low cost.

The present invention will be explained below with reference to embodiments shown in the accompanying drawings.

In Figure 1, there is a reactor A installed on the upstream outflow side of continuously flowing powder, such as a continuous fluidized bed, and a reactor B installed on the downstream inflow side of the powder. When operated at pressures P, , P2, the amount of powder discharged from reactor A is affected by the pressure difference P1 to P2, and the internal pressure of these reactors varies, that is, the pressure difference varies. The amount of discharge and therefore the flow rate of the powder toward the downstream reactor B also fluctuates.

A cone valve is installed in the powder flow path that communicates with reactor A and B so that high-temperature gas does not flow out from reactor A against such pressure fluctuations, and a predetermined amount of powder can be continuously taken out. Device 1 is installed.

A hollow cone valve 3 is interposed inside the casing 2 of the cone valve device 1 and supported on the top of a freely rotatable upright shaft 4 made of a double cylindrical body suitable for circulating cooling water therein. A passage 6 for guiding the powder discharged from the reactor A is connected to the powder inlet 5a at the upper part of the casing 2 via an expansion joint, and a powder outlet 5b at the lower part of the casing 2 is connected to the passage 6 for guiding the powder discharged from the reactor A. The powder passage 7 which is led into the reactor B through the casing 2 is likewise connected via an expansion joint.

8 is a rotary joint for circulating cooling water to flow into the cone valve 3 through the vertical shaft 4, and 9 is an actuator that is activated in response to a signal from a detector 10 that detects the pressure difference ΔP between each reaction device A and B. Cone valve 3 that is always completely sealed
It has the role of automatically adjusting the opening degree by giving vertical movement to the upright shaft 4.

In other words, when the flow rate of powder per unit time is insufficient, the actuator 9 is actuated by the signal from the detector 10 to lower the upright shaft 4 and increase the opening area of the cone valve 3.
On the other hand, if there are too many, the desired purpose can be achieved by raising the upright shaft 4 and reducing the opening area of the cone valve 3.

However, as shown in FIG. 2, when the required opening degree T of the cone valve 3 gradually decreases, the gap between the cone valve 3 and its seating portion narrows, and the flow rate S of the powder decreases. Powder discharge becomes extremely unstable or stops discharging altogether.

That is, the vertical axis shown is the flow rate S of the powder.

The horizontal axis is the [IT] of the cone valve 3 depending on the flow rate of the powder, and point A on the curve shown by the solid line 11 is the discharge resting point when no torque is applied to the cone valve 3.

In order to avoid such troubles, the cone valve 3 is provided with a rotation mechanism to apply torque to the cone valve 3, and the rest point A is shifted to point A2 on the curve indicated by the dotted line 12.

Therefore, even if the opening degree of the cone valve becomes considerably small, the flow of powder does not stop and is smoothly discharged.

FIG. 3 is an enlarged explanatory view showing the detailed structure of the cone valve device 1 shown in FIG. 1, and the casing 2 is made of a material having excellent heat resistance and corrosion resistance, such as stainless steel.

3 is a cone valve, 4 is an upright shaft of a double cylindrical body, 5a is a powder inlet forming a high temperature gas sealing part 20 that is integrally connected to the casing 2, and a funnel is provided at the lower end of the sealing part 20. A shaped shoe portion 21 is formed at the lower end of the chute portion 21, and a seat portion 2 of the cone valve 3 having a required opening area is formed at the lower end of the chute portion 21.
2 is open.

The powder inlet 5a and the passage 6 are connected using an expansion joint 13 made of metal bellows in order to avoid deformation due to thermal expansion due to high temperature powder or high temperature gas.

The powder outlet 5b and the passage 7 in the lower part of the casing 2 are also joined in the same manner as described above.

On the other hand, the upright shaft 4 has the aforementioned rotary joint 8,
In addition to the actuator 9, a bearing 24 fixed to a moving frame of the device (not shown) is provided, and the upright shaft 4 is supported by the bearing 24.

Reference numeral 14 denotes a protective cover provided around the upright shaft 4 adjacent to the cone valve 3, and a gasket 15 made of a heat-resistant material such as asbestos or graphite for sealing between the casing 2 and the upright shaft 4 underneath. This serves to prevent high-temperature powder from coming into direct contact with the product.

A motor 16 rotates the cone valve 3 through a power transmission mechanism in which a belt 19 is passed through a belt pulley 17 attached to the upright shaft 4 and a belt pulley 18 of its driving device.

It is preferable to apply torque to the cone valve 3 when the opening degree of the cone valve 3 is near the rest point A in FIG.

In this case, the limit switch 23 is connected to the motor 16, one contact of the limit switch 23 is fixed to the upright shaft 4, and the actuator 9 is operated in response to a signal from the detector 10 to move up and down together with the cone valve 3. Upright shaft 4
The motor may be started by bringing the contact point of the contact point into contact with the other contact point at a certain height to form a closed circuit.

Thus, at the start of operation, the cone valve 3 is seated on the seating portion 22 formed around the tip opening of the funnel-shaped chute portion 21 at the tip of the seal portion 20, so the cone valve 3 is seated and sealed. Powder of a certain height H stays in the chute part 21 and the seal part 20 above the seating part 22, thereby sealing the high temperature gas.

As the height H increases, the resistance increases and the flow rate of leaking hot gas decreases.

Seal with the powder is performed regardless of whether the gas pressure in each reactor A or B is positive or negative, but it goes without saying that the height H of this powder seal varies. .

For example, even if the opening degree of the cone valve 3 is constant, the differential pressure within the reactors A and B increases, and if the amount of powder filling or staying in the seal portion 20 is large, the height H will increase, which means that the powder The head of the body is large and the amount of powder discharged is large.

In order to avoid changes in discharge volume, or flow rate, due to differential pressure, the opening of the cone valve is automatically adjusted to maintain a constant flow rate.

When the flow rate is constant, the height H is maintained at approximately the same height, maintaining suitable sealing performance.

According to the present invention configured as described above, a cone valve device is provided in the powder flow path that communicates with each other in the reaction apparatus, and a seal is provided for retaining the powder on the powder inlet side in the casing of the cone valve device. A cone valve, which can be rotated as needed along with an upright shaft that is raised and lowered by an actuator, is freely seated in the seating part that opens at the lower end of the chute provided at the lower end of the seal. can be continuously discharged and fed into the next reactor.

In addition, a detector is installed to detect the pressure difference between the reactors, and the signal from this detector is used to raise and lower an upright shaft equipped with a cone valve via an actuator, thereby automatically adjusting the powder flow rate. be able to.

Furthermore, if torque is applied to the upright shaft provided with the cone valve by a motor activated via a limit switch, the trouble of stopping the flow of powder even when the opening degree of the cone valve becomes small can be avoided.

Furthermore, since the cone valve is hollow and integrated with the upright shaft of the double cylindrical body, cooling water can be circulated inside, thereby increasing durability.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing one embodiment of the present invention, Fig. 2 is a curve diagram showing the relationship between the flow rate of powder and the opening degree of the cone valve, and Fig. 3 is an enlarged detail showing the main part of Fig. 1. It is an explanatory diagram. 1... Cone valve device, 2... Casing, 3... Cone valve, 4... Vertical shaft,
5a... Powder inlet, 5b... Powder outlet, 6, 7... Passage, 8... Rotary joint, 9...・Actuator, 10...
...Detector, 11...Solid line, 12...
・Dotted line, 13...Expansion joint, 14...
...protective cover, 15...packet, 16...
...Motor, 17,18...Belt wheel, 1
9...Belt, 20...Seal part, 2
1...Chute part, 22...Seating part,
23...Limit switch.

Claims (1)

[Scope of Claims] 1. A cone valve device is provided in a passage through which powder flows that communicate with each other in the reactor, a seal portion is fitted into the upper part of the casing of the cone valve device, and a funnel is attached to the tip of the seal portion. A seating part is formed around the tip opening of the shaped chute part, and a cone valve, which is integrally supported by an upright shaft, is seated on the seating part at the start of operation. The powder is retained at a required height to form a high-temperature gas seal, and the vertical shaft is moved up and down in response to a signal from a detector that detects the pressure difference within each reactor. An actuator is installed to automatically adjust the flow rate of the powder, and a limit switch whose contact closes when the opening of the cone valve becomes small due to the operation of the actuator is installed at a desired height on the upright shaft. ,
A continuous supply and discharge device for high temperature powder, characterized in that a drive device driven by a motor activated by the limit switch is provided on an upright shaft. 2. The continuous supply and discharge device for high temperature powder according to claim 1, wherein the cone valve is a hollow body through which cooling water flows. 3. The continuous supply and discharge device for high temperature powder according to claim 2, wherein the upright shaft supporting the cone valve is a double cylindrical body having a rotary joint for circulating cooling water.