JPS6196320A - Air feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an air supply device and improvements thereto.

In particular, the invention is described with respect to such a device as may be used for the conveyance and discharge of quantities of any material, such as granular coal.

In prior art combustion devices, it has been possible to introduce fuel in a predetermined and regulated amount for control purposes to ensure that combustion takes place with an appropriate intensity related to the required heat output. Much needed. These requirements are particularly important for boilers, especially combustion systems that employ fluidized bed combustion that are sensitive to changes in fuel supply input.

Air supply devices are well known and generally include a pressure vessel into which material is introduced via a valve closure.

A valve is provided in the conveying line downstream of the pressure vessel and, in use, is pressurized to provide the motive force for conveying the material, and then the valve is opened. In a device of the known type, in which a single air jet is provided in the conveying tube, a device of the known type is completely sufficient when the amount of material discharged is not critical or limited.

Problems to be Solved by the Invention In operating situations where the amount of material is important, such as in the above-mentioned applications, however, conventional feeding devices are inadequate.

It is an object of the present invention to provide an improved air supply system that allows precise amounts of material to be delivered and discharged to the point of use.

SUMMARY OF THE INVENTION According to the invention, an air supply system includes a pressure vessel, an inlet to the pressure vessel, a valve associated with the inlet, an outlet from the pressure vessel, and an 11M pipe connected to the outlet. a first valve associated with the regulating pipe at the inlet to the regulating pipe; a second valve downstream of the first valve at the outlet from the 11M pipe; and a vent provided in the second valve. It has

Preferably, the first and second valves are spaced apart by a distance determined by the length of the regulating tube and are spaced apart by a distance determined by the length of the regulating tube to determine the amount of material to be pumped out by the air supply device.
It forms the spherical part of the body.

The vent of the second valve is conveniently formed by a hole in the ball.

Preferably, the first valve is adjacent downstream of the first valve. An air injector is advantageously provided in the regulating pipe intermediate the second valve.

Apparatus is provided for pressurizing the pressure vessel such that, in use, the first valve is opened and the first valve is opened.

The axis of the pressure vessel is preferably oriented vertically, and the adjustment pipe is coaxial with the pressure vessel in the vertical direction or is provided horizontally,
A suitable elbow connection is provided between the outlet of the pressure vessel and the regulating tube.

By way of example, one embodiment of the air supply device of the invention will be described in detail below with reference to the accompanying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, the illustrated air supply device 1 is an inverted frusto-conical hollow pressure chamber having a dome-shaped lid cap 4 with a solenoid-controlled air charge valve 8 cooperating with an associated inlet 6. It has a container 2.

The pressure vessel 2 is fitted with an elbow fitting 1 to a pneumatically actuated ball 14 controlled by a solenoid adjacent to a downstream air injector 16.
It has a flanged outlet 10 connected via 2.

An adjustment tube 18 of a predetermined length is connected to the air injector 16, the outlet 20 is provided with a second solenoid-controlled pneumatically actuated bulb 22, and a hole is provided in the bulb 24 to provide a vent integral with the valve arrangement. 26 is worn. The length and diameter of the regulating tube 18 is the product of 'g' and therefore commands the increasing amount of material transferred and dispensed by the air supply 1 and the slug. Granular coal, which can be designated as "fine", is introduced into the pressure vessel 2 via the inlet 6 during the first step of the cycle, when the air charging valve 8 is opened. After the pressure vessel 2 has been filled with coal, the air charging valve 8 is closed and the pressure vessel 2 is connected to the line 30.32.
Pressurized with air via. As a result, the coal moves down inside the pressure vessel 2 and fills the elbow joint 12. While the pressurization is maintained, the first bulb 14 is opened and the coal is forced through the bulb 14 into the regulating tube 18, the coal hits the bulb 24 of the second bulb 22 and the conveying air flows through the hole 26.
vented through. The regulating tube 18 is therefore completely filled with a specific volume and weight of coal. The first bulb 14 is then closed against the coal head in which the measured amount of coal remains in the regulating tube 18.

The second bulb 22 is then opened and compressed air is introduced through the air injector 16 and along a conveying line (not shown) attached via a reducer 38 to the discharge side of the second bulb 22. and promote coal slag.

The bulb 22 is then closed and the cycle repeated at predetermined intervals as required to provide in each case a precise delivery of the predetermined amount of coal.

This is an advantage of the invention, which is relatively simple in form and operation. Air supply bag! 1 is particularly, but not exclusively, useful as a feeder for boilers and furnaces that require a special amount of fuel to be fed.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing the air supply device of the present invention. In the drawing, 1: air supply device, 2: pressure vessel, 4: cap,
6: Inlet, 8: Air charging valve, 10: Outlet, 12: Elbow joint, 14.22 Ball, 16: Air injector, 18
・Adjustment pipe, 2o, outlet, 24: ball, 26: hole, 30, 3
2: Conduit, 38/Reducer. mouth

Claims (1)

[Claims] 1. A pressure vessel, an inlet to the pressure vessel, and a valve associated with the inlet;
In an air supply device with an outlet from a pressure vessel, a regulating pipe (18) connected to the outlet (10), a first valve (14) associated with the regulating pipe (18) at the inlet to the regulating pipe; Air supply device, characterized in that it comprises a second valve (22) downstream of the first valve (14) at the outlet from the regulating pipe (18). 2. The air supply device according to claim 1, wherein the first and second valves (14, 22) are spherical parts. 3. Claim 2, characterized in that the ventilation of the second valve (22) is formed by a hole (26) in the bulb.
Air supply device as described in section. 4. Adjacent to the downstream of the first valve (14) are the first and second valves (14).
4. The air supply device according to any one of claims 1 to 3, characterized in that the regulating tube (18) is provided with an air injector (16) in the middle of the regulating pipe (18). 5. Any one of claims 1 to 4, characterized in that a device is provided for pressurizing the pressure vessel (2) and promoting charging of the material to be used into the regulating pipe (18). Air supply device as described. 6. The air supply device according to any one of claims 1 to 5, wherein the pressure vessel (2) has a vertical axis and an outlet (10) at the bottom. 7. The air supply device according to claim 6, characterized in that the regulating pipe (18) is oriented in a horizontal direction. 8. Air supply device according to claim 6, characterized in that the regulating pipe (18) is oriented vertically and is coaxial with the pressure vessel (2). 9. Air supply device according to any one of claims 1 to 8, characterized in that the first and second valves (14, 22) are pneumatically operated, solenoid-controlled valves.