JPS61295412A - Forwarding fire grate for combustion chamber for burning solid fuel or pasty fuel - Google Patents

Abstract

1. A feed grating for combustion chambers for the firing of solid or pasty fuels, characterized in that to form a closed grating plane impermeable to fuel and ash, a plurality of plates (1-5) lying substantially horizontally in a row are superposed one above the other staircase-fashion, the top plate being disposed at the filling side end of the combustion chamber (6) ; the odd plates (1, 3, 5) in the row and the even plates (2, 4) each being combined with one another to form a pack, the plates of both packs being offset in the direction of the row by the same horizontal amount between their front edges ; at least one of the packs is mounted to be displaced in the direction of the row and is coupled to a controllable driving device (10 ; 12) whose travel can be varied, the two packs being displaceable in relation to one another as far as the horizontal amount of offsetting of the plate front edges ; and the plates of at least one of the packs consist of hollow boxes (13, 15) which are connected to an air supply line (9 ; 11) and whose upper walls (13) are formed with a plurality of small, nozzle-like air discharge holes (14) distributed over the box surface.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a forward grate for a combustion chamber for burning solid or pasty fuels.

BACKGROUND OF THE INVENTION Reciprocating grate stokers are already known in large combustion plants, such as steam generators in power plants, in which the grate plates are arranged in inclined grate passages, the slope of which being is slightly smaller than the angle of repose of the solid fuel species used in each case, and the grate plate generally carries out a reciprocating movement, whereby the grate passages move the fuel layer through the inclined grate passages. It moves in a wave shape to move it downward. Combustion air is introduced below the grate passages and is passed from the grate plates into the fuel bed. For example, when lignite, which disintegrates during combustion, is used as fuel, grate plates are used which form horizontal passages between the edges of the grate plates that overlap each other in a stepped manner, and only said horizontal passages are used. Through the combustion air passes into the fuel layer.

Problems to be Solved by the Invention The problem to be solved by the present invention is to solve the problem of ash removal from a combustion chamber which belongs to the type of large heating zein conventionally used in the sump of hot water heating equipment of a building, and which can burn a variety of solid fuels. Improving the feed grate of the combustion chamber sump of a heated zebra-like combustion device, where structural and space considerations preclude the construction and application of the reciprocating grate stoker customary in large combustion installations, Even when the direction of movement of the fuel layer is horizontal, the grate or grate can be effectively and reliably advanced so that the combustion residue can be carried out of the combustion chamber, and the fuel or ash can fall through the feed grate. Since it is not necessary to provide an additional extraction device below the grate passage to prevent the debris from falling and thereby to extract the fallen residue, the V+A-force, J/Inuishi, and the combustion are The purpose is to distribute the air so that it can be introduced into the fuel layer.

Means for Solving the Problem The structural means of the present invention for solving the problem described above is such that a closed grate plane is formed which does not allow the passage of fuel and ash.
For this purpose, a plurality of horizontal plates arranged substantially in a row in the horizontal direction overlap in a step-like manner, and the uppermost horizontal plate is located at the fuel charging side end of the combustion chamber. The odd-numbered horizontal plates and the even-numbered horizontal plates counting from the top horizontal plate form sets and are connected to each other, and both sets of horizontal plates are connected to each other in front of the horizontal plate when viewed in the column direction. The edges are offset by equal horizontal dimension values, at least one set of horizontal plates is supported so as to be shiftable in the column direction and is connected to a drive with variable control of the stroke value; the sets of horizontal plates are shiftable relative to each other up to the horizontal displacement dimension of the leading edges of the horizontal plates, and at least one set of horizontal plates consists of a hollow box, the hollow box being connected to the air supply conduit; The upper wall of the hollow box has a number of small nozzle-like air blowing holes distributed over the entire upper surface of the box.

Example Next, embodiments of the present invention will be explained in detail with reference to the drawings.

The advance grate running at the bottom of the combustion chamber 6 with the charging lower and the ash outlet 8 consists of a plurality of horizontal plates 1°2.3, 4.5, which are arranged in a row. In this case, the uppermost horizontal plate 1 is the combustion chamber 6.
at the end with the charging lower and forming a closed grate plane impermeable to fuel and ash.

The horizontal plates 1-5 are horizontally shiftable along both side guides. Odd-numbered horizontal plates 1, 3.5 and even-numbered horizontal plates 2, 4 counting from the top horizontal plate form sets and are connected to each other. In this case horizontal plate 1
, 3.5 and the horizontal plates 2, 4 are offset by equal horizontal dimensions between their leading edges when viewed in the row direction. The odd-numbered horizontal plate sets and the even-numbered horizontal plate sets are shiftable relative to each other until a horizontal displacement dimension value of the leading edges of the horizontal plates is reached. Therefore, for example, the horizontal plate 1 moves forward on the horizontal plate 2 from the position shown in FIG. 1 to the position shown in FIG.
Transfer upwards. When the horizontal plates 1, 2 return from the position shown in FIG. 2 to the position shown in FIG. 1, the horizontal plate 2 transfers the grate or grate placed on the horizontal plate δ onto the horizontal plate Φ. Such a relative shifting movement of both sets of horizontal plates can be achieved by making only one of both sets of horizontal plates shiftable, in which case the loaf movement distance of the set of horizontal plates is equal to the leading edge of the horizontal plate. shall correspond to the total horizontal displacement dimension value. In order to reduce the structural length of the advance grate, it is even more advantageous to design both sets of horizontal plates so that they can be shifted respectively, as shown in the exemplary embodiment shown, in which case the stroke movement of each set of horizontal plates is The distance may correspond to the horizontal displacement value A of the front edge of the horizontal plate. In the embodiment shown, the odd-numbered horizontal plates 1, 3, 5 are controllable via a link 9 with a drive 10, and the even-numbered horizontal plates 2, 4 are controllable via a link 11. The drive unit 12 is connected to the drive unit 12. Each drive device 10, 120 of the connected horizontal plate set
The stroke value is variable, and therefore the stroke value of the horizontal plate set can be arbitrarily set to be smaller than the horizontal displacement dimension value of the leading edge of the horizontal plate.

In order to supply combustion air into the fuel layer, at least one set of horizontal plates consists of a hollow box, which is connected to the supply air conduit, and in which the hollow top wall 13 is It has a large number of small nozzle-like air outlets 14 distributed over the entire top surface of the box (FIG. 3). For example, when the even-numbered horizontal plates 2 and 4 are configured as hollow boxes, the amount of air sucked into the fuel layer from the hollow boxes is as follows:
Although there are differences in degree, the amount is measured by advancing from the position shown in FIG. 1 and cutting the upper surfaces of the horizontal plate 2 and the jar. In the exemplary embodiment shown, it is even more advantageous for both sets of horizontal plates to be constructed as hollow boxes. In this case, the chain 9,1
1 as a hollow rod for supplying air into both sets of hollow box horizontal plates. If both sets of horizontal plates consist of hollow boxes for the combustion air supply reservoir, then the even-numbered hollow box type horizontal plates 2°4
The amount of air coming out is controlled by the odd-numbered hollow box-shaped horizontal plates 1, 3 and the even-numbered hollow box-shaped horizontal plates 2, 4.
This is done by applying a variable force to the horizontal plates 1 and 2, and this force ζ is the amount of air that exits from the odd-numbered hollow box-shaped horizontal plates 1 and 3 at a time. This is done by actuating a common air valve (not shown) located in the air section or in the hollow rotor.

The construction of a horizontal plate consisting of a hollow box with a large number of tiny nozzle-like air outlets distributed over the upper surface of the hollow box results in an even fine distribution of the air blown into the fuel layer. By slowly shifting one or the other set of hollow Dix-type horizontal plates by a value smaller than the horizontal displacement dimension of the leading edge of the horizontal plate, a fine air jet stream from the nozzle-shaped air outlet is As the fire is displaced from one entry point to another, the fire is caused by a large number of fine air jets ejecting upwards from the hollow box horizontal plate and by the possible displacement of the air jets relative to the fire bed. Even bed combustion occurs.

Even when configured as a hollow box, the horizontal plates form a fully closed grate plane downwards, so special measures are taken to remove fuel or ash falling through the grate plane. It is no longer necessary to provide additional equipment below the advance grate. By ejecting the combustion air from the hollow box in the form of a large number of fine air jets through a large number of fine nozzle-like air outlets, a particularly strong cooling of the hollow box upper wall 130 is obtained, and thus the hollow box While the box can be made from the casting materials customary for grate, fuel particulates or ash particulates or dust can flow through the nozzle orifices against the flow velocity of the fine air jet ejected from the nozzle orifices. Falling through the hollow box into the hollow box is prevented. As shown in FIG. 3, the hollow box-type horizontal plates 1.2, 3, 4.5 have a lower portion 15 having connecting rings 11, 9 in the form of hollow ronds that communicate with each other, and a removably mounted hollow groove. It is more advantageous to have a box top wall 13. With this structure, if solid particles get into the hollow box, the hollow box can be removed by removing the hollow box top wall 13. It becomes possible to open up.

[Brief explanation of drawings]

1 and 2 are side views of the forward grate shown schematically in two different movement positions, and FIG. 3 is an enlarged detailed view of the forward grate. 1.2, 3, 4.5...Horizontal plate, 6...Combustion chamber, 7
...Charging port, 8...Ash outlet, 9...Linkage, 10
... Drive device, 11... Chain link, 12... Drive device, 13... Hollow box upper wall, 14... Air blow hole, 15... Lower part

Claims (1)

Claims: 1. A plurality of horizontal plates (1, 2, 3, 4, 5) overlap in a step-like manner, and the top horizontal plate (1) is the combustion chamber (6).
It is located at the end of the fuel charging side, and the odd-numbered horizontal plates (1, 3, 5) and even-numbered horizontal plates (2, 4) counting from the uppermost horizontal plate (1) are located at the end of the fuel charging side. The horizontal plates of both sets are offset from each other by an equal horizontal dimension value between the front edges of the horizontal plates when viewed in the column direction, and at least one set of horizontal plates is connected to each other in the column direction. A drive device (
10, 12), both sets of horizontal plates can be shifted relative to each other up to the horizontal displacement dimension of the front edge of the horizontal plates, and at least one set of horizontal plates is connected to the hollow box (13, 12). 15), the hollow box is connected to the air supply conduits (9, 11), and the upper wall (13) of the hollow box is equipped with a number of small air outlets in the form of nozzles distributed over the entire upper surface of the box. Hole (14
) for a combustion chamber for burning solid or pasty fuels. 2. Both sets of horizontal plates are equipped with controllable drives (10, 1
2) and can be shifted in the column direction, and each horizontal plate set (1, 3, 5; 2, 4) can be shifted in the column direction up to 1/2 of the horizontal displacement dimension value of the front edge of the horizontal plate. 2. A forward grate according to claim 1, wherein both sets of horizontal plates (1, 3, 5; 2, 4) consist of hollow boxes (13, 15). 3. The first aspect of the present invention is characterized in that the horizontal plates belonging to one group and consisting of hollow boxes are connected to the drive device by a connecting rod, and the connecting rod is configured as a hollow rod for supplying air. The forward-feeding grate according to paragraph 2 or paragraph 2. 4. The hollow box has a lower part (1
5) and a hollow box upper wall (13) removably mounted on the lower part and having a number of nozzle holes (14) for blowing out air. The advance grate according to any one of paragraphs 1 to 3. 5. A metering valve is incorporated in the common air supply conduit leading to the hollow boxes of one horizontal plate set (1, 3, 5), and the hollow box of the other horizontal plate set (2, 4) The amount of air ejected from said one horizontal plate set (1, 3,
5) The hollow box connects the other horizontal plate set (2,
4) Forward-feed grate according to claim 2, adjusted by covering the nozzle holes (14) of the hollow box.