JPH0745467Y2 - Gas control valve for solid particulate recirculation - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas regulating valve for controlling the reflux of solid particles in a circulation device, and more particularly to a non-mechanical device that is easily piped and has a specially designed gas nozzle arrangement. Gas control valve.

[0002]

2. Description of the Related Art In a solid fine particle conveying system, controlling the flow velocity of particles is essential for maintaining lubrication and continuous process. Since the characteristics of solids are significantly different from the characteristics of fluids (including gases and liquids), the transport control of solid particles is often more difficult than the transport control of fluids. In order to control the reflux rate of solid particles and maintain the stability and reliability of the transport system, it is important to select an appropriate control valve. FIG. 1 shows an example of a solid fine particle reflux device used in a circulating fluidized bed incinerator or a combustion device.
Solid fine particles such as ash, sand, or incompletely burned fuel remaining in the combustion furnace (1) are expelled by introducing gas at high speed from the inflow pipe (2), and are discharged to the cyclone type separation device (3). Be transferred. Here, the gas is discharged from the outflow portion (4) above the separation device (3), and the solid fine particles collected by the cyclone type separation device (3) are passed through the control valve (5) to the combustion furnace (1). ). At this time, it is necessary that the control valve used in the reflux device has a sealing function sufficient to withstand the flow of gas containing solid particles. The valves used to convey the particles are generally
It is roughly divided into mechanical valves that use chains and gate valves and non-mechanical valves that use air transfer. These two types of valves have different properties and are suitable for different applications. Mechanical valves are not suitable for devices that operate at high temperatures, such as incinerators, because their components easily break or deform at high temperatures. For this reason, devices that operate at high temperatures typically use non-mechanical valves rather than mechanical valves that do not require mechanical action to operate.

[0003]

However, when using a non-mechanical valve, some problems may occur. 2 to 5 show examples of non-mechanical valves that have been conventionally used for controlling the reflux of solid particles. The L-type control valve shown in FIG.
The flow of solid fine particles that has flowed in through 1) is
2) is configured to be released. But,
In this L-type control valve, the flow of solid fine particles cannot be maintained in a stable state, and the reflux ratio is unstable, so that it is rarely used for large-scale processing actually performed at high temperature. 3, 4, and 5 respectively show a V type control valve, a seal pot type control valve, and a loop seal type control valve. In order to control the flow rate and maintain a smooth particle flow, these control valves are designed based on the theory of flow distribution. That is, each valve has a bottom plate (13
a, 13b, 13c) are attached and the gas (14a,
14b, 14c) are configured to be introduced through this opening. By the introduction of gas from the bottom plate, the solid fine particles flow into the fluidized bed, which flows in through the inflow pipes (15a, 15b, 15c) and flows out through the outflow pipes (16a, 16b, 16c). These control valves are more useful and stable than the L-type control valves described above, but are difficult to manufacture due to the complicated design of the bottom plate, and
There was a problem that it was not suitable for repair or maintenance. The present invention has been made in order to solve the above-mentioned problems in the prior art, and provides a non-mechanical gas control valve that is simple in piping and designed to efficiently recirculate solid fine particles. The purpose is to do. A further object of the present invention is to provide a non-mechanical gas control valve having a sealing effect that can sufficiently withstand the flow of gas containing solid fine particles.

[0004]

In order to solve the above-mentioned problems, the gas control valve of the present invention uses an upright pipe, a horizontal pipe, an overflow pipe, a tilt pipe, and high pressure gas to introduce solid gas. A plurality of small tubes or gas nozzles, which are attached to the side surfaces of the upright tube and the horizontal tube and are individually controllable so as to maintain a smooth flow of fine particles, are provided.

[0005]

Since the plurality of gas nozzles are designed to be individually controllable, the gas flow can be accurately controlled and the reflux ratio of the solid particles can be kept constant. Further, since the horizontal pipe is attached, it is possible to maintain a high sealing effect while conveying the solid fine particles. Since the gas control valve of the present invention is a non-mechanical valve,
It is suitable for high-temperature processing without causing damage or deformation. Further, since the piping structure is geometrically simple, repair and maintenance can be easily performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, in the circulating fluidized bed incinerator, the solid fine particles flowing from the combustion furnace (1) are collected by the cyclone type separator (3) and then burned via a control valve (5). Returned to the furnace (1). As shown in FIGS. 6 and 7, the solid fine particle recirculation gas control valve according to the present invention is connected to a cyclone type separating device, and has an upright pipe (32) for receiving a flow (31) of solid fine particles and the upright pipe ( A horizontal tube (33) connected to the other end of 32)
And The other end of the horizontal pipe (33) is further connected to an overflow pipe (34), which is arranged vertically and connects at the other end to a tilt pipe (35). The inclined pipe (3
By connecting 5) to the combustion furnace, the solid fine particles are returned to the combustion furnace.

A plurality of small tubes (36), (37) used as gas nozzles for introducing high-pressure gas in order to maintain a smooth flow of solid fine particles and control the flow velocity, are the upright tube (32) and the horizontal tube. It is attached to the side of the tube (33). Arranged so that the small tube (37) is perpendicular to the upright tube (32) and the small tube (36) is inclined at an angle of 30 to 60 degrees with respect to the horizontal tube (33). . Since the flow of the solid fine particles flowing through the upright pipe (32) acts like a dense packed moving bed,
The valve of this example is capable of withstanding a large flow of gas containing solid particulates through the upright tube (32). Small tube (3
By adjusting the flow rate of the high-pressure gas flowing through 7) and slowing the flow of solid particles, the packed moving bed moves downward and flows into the horizontal pipe (33). High-pressure gas is introduced into the horizontal pipe (33), and the overflow pipe (3
4) Help with transportation to. A plurality of small tubes (36) are arranged. The solid fine particles pushed to the outlet of the overflow pipe (34) are returned to the combustion furnace again via the inclined pipe (35).

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment and can be implemented in various modes without departing from the scope of the invention.

[0009]

As described above, the gas control valve of the present invention can control the flow velocity of particles by controlling the amount of high-pressure gas introduced. Furthermore, since the solid fine particles that have flowed in form a packed moving layer in the control valve, the solid fine particles can be refluxed without being hindered by the reflux of a large amount of gas.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a circulating fluidized bed incinerator.

FIG. 2 is a schematic view showing a conventional L-type control valve.

FIG. 3 is a schematic view showing a conventional V-type control valve.

FIG. 4 is a schematic view showing a conventional seal pot type control valve.

FIG. 5 is a schematic view showing a conventional loop seal type control valve.

FIG. 6 is an elevational view showing a preferred embodiment of the present invention.

FIG. 7 is a partial cross-sectional elevational view showing the preferred embodiment.

[Explanation of symbols]

1 ・ ・ Combustion furnace, 3 ・ ・ Cyclone type separator, 5 ・ ・ Control valve, 31 ・ ・ Solid fine particles, 32 ・ ・ Upright pipe, 33 ・ ・
Horizontal pipe, 34 ... Overflow pipe, 35 ... Inclined pipe, 36 ...
Small tubes, 37 ... small tubes.

Claims (4)

[Scope of utility model registration request] 1. A gas control valve for controlling the reflux rate of solid particles in a circulation system using a high-pressure gas, which is an upright pipe having a lower end and an upper end, and one end of which is connected to the lower end of the upright pipe. A horizontal pipe; an overflow pipe connected to the other end of the horizontal pipe at one end thereof; and an inclined pipe connected to the other end of the overflow pipe, wherein solid fine particles flow through the upright pipe, It is configured to be discharged from the inclined pipe via a pipe and an overflow pipe, and further, at least on the side faces of the upright pipe and the horizontal pipe so that high-pressure gas is introduced to control the flow rate of the solid fine particles. A gas regulating valve, characterized in that one pipe is provided. 2. At least one tube disposed on a side surface of the upright tube is disposed perpendicular to a side surface of the upright tube.
The gas regulating valve according to claim 1, wherein: 3. The at least one tube disposed on the side surface of the horizontal tube is disposed so as to have an inclination angle of 30 to 60 degrees with the side surface of the horizontal tube. 1. The gas control valve according to 1. 4. The gas regulating valve according to claim 1, wherein three pipes are connected to a side surface of the horizontal pipe.