JPH0330677Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is a damper device for separating powder and granular materials, in particular,
This invention relates to a distribution damper device for a fluidized bed boiler in which fuel is introduced from the top of the furnace.

<Conventional technology> When the hearth area of a fluidized bed boiler in which fuel is injected from the top of the furnace is large, a method for supplying fuel evenly into the fluidized bed is to install many fuel inlets and connect them to these inlets. distribution damper for fuel distribution,
It is carried out by a combination of a distribution screw or a distribution conveyor and a distribution chute. An example of a conventional device based on this type of method is shown in FIG.

Fuel is transferred to the vicinity of the top of the boiler by a belt conveyor 1. This fuel is divided into two equal parts by a distribution damper 2, and further distributed to the fuel input inlet by a distribution screw 3. A rotary damper 4 in the charging section serves as a fuel supply device that also serves as a gas seal inside the furnace. A distribution chute 5 located downstream of the rotary damper 4 further distributes the fuel.

When the fluidized bed boiler is at maximum load, the entire furnace is in a fluid state, and therefore the fuel needs to be distributed and supplied evenly over the entire furnace area. Therefore, the distribution damper 2 is placed in the neutral position as shown in Figure 5. It has been set. At partial load, approximately half the area of the furnace is in a flowing state, and the other is in a stationary state. Therefore, the fuel supply needs to be evenly distributed over the furnace halves.
The distribution damper 2 is set at a position where the damper is pushed to one side as shown in FIG. That is, the distribution damper 2 has the role of changing the combination of distribution chutes into which fuel is introduced, depending on the load of the fluidized bed boiler.

<Problems to be solved by the invention> In the above-mentioned prior art, the damper blades of the distribution damper 2 are configured to cross the fuel supply flow and divide it, so the damper blades 6 are in a neutral position. At a maximum load, which is the maximum amount of fuel supplied as a whole, fuel collides with the tip of the damper blade 6. Due to this fuel collision, the fuel is divided into each distribution screw 3. This is the function of this distribution damper, but depending on the nature of the fuel, the damper blades may become clogged. In other words, when the viscosity is low and the fuel is smooth, it is easily separated by the damper blade, but when the viscosity is high and the fuel is sticky, the fuel adheres to the damper blade as shown at 7 in Figure 5, and this gradually grows. However, there was a problem that the damper became clogged.

<Purpose of the invention> The purpose of the invention is to provide a distribution damper in which fuel is less likely to adhere to the damper blades even when highly adhesive fuel is injected.

<Summary of the means> A damper device that distributes and supplies powder to two ducts located almost vertically has a rectangular cross section, damper blades are hinged to the left and right walls of the damper device, and a link mechanism allows the damper device to be opened fully or to either the left or right side. This distribution damper device supplies powder and granules to the duct with one side closed, and prevents the powder and granules from adhering to the tips of the blades.

<Example> FIG. 1 is a drawing showing the structure of a damper according to an example of the present invention.

Two damper vanes 12 are supported within the distribution damper casing 11 by a shaft 17 passing through the distribution damper casing 11. This damper blade 12
inside the distribution damper casing 11, it has a structure that opens into left and right parts with the center as a border. The shafts 17 are connected by one link 13. The lug for the shaft 17 and the link 13 are connected by bolts, and the connecting portion of the link 13 is an elongated hole, and the connecting bolt is tightened to the extent that it can move smoothly within this elongated hole. Link 13
An L-shaped link 18 is connected to the center of the damper blade 12, and a weight 15 is attached to this L-shaped link 18 to smooth the movement of the damper blade 12.

A link 14 is attached to the other end of the L-shaped link 18, and the operating cylinder 16 and the L-shaped link 18
It is shaped like a knot.

<Function> The center of the link 13, that is, the point where the L-shaped link 18 is attached, is the distribution damper casing 11.
When the damper blade 12 is at the center of the damper blade 12, the damper blade 12 tends to move downward in the vertical direction due to its own weight, and moves downward until the connecting bolt is seated in the elongated hole of the link 13. Therefore, the elongated hole of this link 13 is drilled to a position where the damper blade 12 becomes vertical. Therefore, when the L-shaped link 18 is in the center position, the two damper blades 12 are open downward, so that the fuel injected from the upper part of the distribution damper casing 11 flows into the casing 1.
It falls downward while being evenly dispersed within 1. When the operating arm of the operating cylinder 16 moves downward as shown in FIG. 2, the L-shaped link 18 rotates counterclockwise and the link 13 moves to the left. Accordingly, the lug of the shaft 17 of the right damper blade 12 engages with the right end of the elongated hole of the link 13, and as the link 13 moves to the left, the damper blade 12 is lifted upward. As a result, the fuel injected from the upper part of the distribution damper casing falls to the left side of the casing 11, and the fuel is supplied only to the distribution screw located below. When the operating arm of the operating cylinder 16 rises upward as shown in Figure 3, the L position is opposite to the movement shown in Figure 2.
Since the shaped link 18 rotates clockwise, the link 1
3 moves to the right. Therefore, at this time, the left damper vane 12 is lifted upward, and the fuel falls to the right side, so that only the distribution screw located below it is supplied with fuel. That is, the movement of one operating cylinder 16 can distribute and supply fuel to two distribution screws.

<Effects> By implementing this idea, it is possible to distribute fuel to the distribution screw using the downward damper blades instead of the upward damper blades, so even in the case of highly adhesive fuel supply, the fuel flow can be "scrubbed off". ”
This action prevents fuel from adhering to the tips of the damper blades, thereby preventing clogging and malfunction of the distribution damper due to the growth of adhesion. In addition, normally two operating cylinders are required to operate the two damper blades according to the boiler load, but with this invention, the operation can be performed with one operating cylinder. equipment costs and operating costs will be reduced.

[Brief explanation of the drawing]

Fig. 1 is a side view of a distribution damper device showing an embodiment of this invention, Fig. 2 is an explanatory diagram of the state of the damper blade and link when powder and granular material is being supplied to the left chute, and Fig. 3 is A diagram of the state when powder is being supplied to the right chute, Figure 4 is a diagram of the relationship between the conventional powder distribution and the screw, and Figure 5 is an explanatory diagram of the situation when accumulation occurs at the tip of the conventional damper blade. , FIG. 6 is an explanatory diagram showing a state in which the left chute is closed. 1...Belt conveyor, 2...Distribution damper, 3
...Distribution screw, 5...Distribution shot, 11
...Casing, 12...Damper blade, 13,1
4, 19... link, 18... L-shaped link.

Claims (1)

[Scope of utility model registration request] In a damper device having a rectangular cross section that connects two chute for supplying powder and granular material at their lower ends, there are two damper blades 12 whose upper ends are hingedly attached to the left and right walls of the damper device, respectively, and the hinge axis center. a link 19 for operating the damper blade coaxial with the link 19, a link 13 connected to the link 19 via left and right slits 20, and an L-shaped link connected to the link 13 and driving the link 13 to displace it left and right. A distribution damper device comprising a link 18 and a set of a link 14 and a link 14A that are linked to the L-shaped link 18 and connected to an operating cylinder 16 that drives it.