JPH0325001Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a stepped drying stoker used, for example, in drying dewatered cakes of various sludges (water and sewage, human waste, wastewater treatment, etc.).

(Prior art) Conventionally, this type of step-type drying stoker
For example, the one described in JP-A-59-183212 is known.

Basically, the upper surfaces of the fixed grate and the movable grate are flat, and these are substantially horizontal and arranged alternately in a step-like manner.

By moving the movable grate back and forth with respect to the fixed grate, the dehydrated cake is sequentially transferred downward to the front and dried. It is designed to be stirred and turned over.

However, in the conventional method, the upper surface of each grate was flat, and the difference in level between them became a drop, which resulted in poor stirring and turning performance of the dehydrated cake.

(Problems that the invention attempts to solve) This invention was created in view of the problems mentioned above and to solve them, and its purpose is to:
To provide a stepped drying stoker which greatly improves the stirring and reversing performance of dehydrated cake.

(Means for solving the problem) The stepped drying stoker of the present invention has a fixed grate and a movable grate whose upper surfaces are flat, and these are arranged approximately horizontally and alternately in a stair-like manner to dry the dehydrated cake. The step type drying stoker is characterized in that a protrusion having a steeply inclined front surface and a gently inclined rear surface is formed on the front side of the upper surface of either the fixed grate or the movable grate.

(Function) When the movable grate is moved back and forth with respect to the fixed grate, the dehydrated cake is sequentially moved to the lower front side and dried.

Since projections are formed on the front side of the upper surface of at least one of the fixed grate and the movable grate, when the dehydrated cake moves from the upper surface of the grate with the projections to the upper surface of the lower grate, migrates over the protrusion.

Therefore, since the dehydrated cake moves through a head that is larger than the step between the top surfaces of each grate by the amount of the protrusion,
There are more opportunities to stir and invert.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a schematic vertical sectional view showing a step-type drying stoker according to an embodiment of the present invention, and FIGS. 2 to 4 are similar views showing the operating state thereof.

The main parts of the stepped drying stoker 1 include a fixed grate 2, a movable grate 3, and projections 4.

There are a plurality of fixed grates 2 and movable grates 3 each having flat upper surfaces 5 and 6, and these are arranged approximately horizontally and alternately in a step-like manner.
Each movable grate 3 is moved back and forth relative to the movable grate 3.

That is, each fixed grate 2 is fixed to the furnace body of an incinerator for dewatered sewage cake, for example. Each movable grate 3 is supported so as to be movable in the front and rear directions relative to the furnace body, and is synchronously moved back and forth by a driving machine.

The protrusion 4 is formed on the front side of the upper surface of either the fixed grate 2 or the movable grate 3, and has a steeply sloped front surface and a gently sloped rear surface.

In this example, each fixed grate 2 is formed on the front side of the upper surface, and is a separate piece having a substantially triangular shape and is fixed by welding or the like.

Thus, the protrusions 4 are designed so as not to hinder the back and forth movement of the movable grate 3.

Next, the operation will be explained based on such a configuration.

When each movable grate 3 is moved back and forth with respect to each fixed grate 2 by starting the driving machine, the dehydrated cake A is successively moved to the lower front side and dried.

When the dehydrated cake A transitions from the fixed grate 2 to the movable grate 3, the dehydrated cake A passes through a substantially triangular protrusion 4 formed on the front side from the flat upper surface 5 of the fixed grate 2.
to reach the flat upper surface 6 of the movable grate 3.

At this time, the head height H of the dehydrated cake A is from the top of the protrusion 4 to the flat top surface of the movable grate 3, and the height difference h from the flat top surface 5 of the fixed grate 2 to the flat top surface 6 of the movable grate 3. That is, since the height of the protrusions 4 is greater than the height of the fixed grate 2, there are more opportunities for the dehydrated cake A to be stirred and turned over.

Of course, the migration distance of the dehydrated cake A becomes longer as the dehydrated cake A passes over the protrusion 4.

Therefore, stirring and inversion of the dehydrated cake A are promoted, and drying is performed satisfactorily.

In addition, in the previous embodiment, the protrusion 4 is the fixed grate 2.
However, the present invention is not limited thereto, and the movable grate 3 may be formed, for example.

Although the protrusion 4 has a substantially triangular shape in the previous embodiment, it is not limited to this, and may have another shape, for example.

In the previous embodiment, the protrusions 4 are separate pieces that are later combined, but the invention is not limited to this, and may be formed integrally from the beginning, for example.

The protrusion 4 was solid in the previous embodiment, but
It is not limited to this, and may be hollow, for example.

Although the protrusion 4 was attached by welding in the previous embodiment, the present invention is not limited to this, and the protrusion 4 may be attached by, for example, a bolt.

(Effects of the invention) As described above, according to the present invention, the following excellent effects can be achieved. (1) Since it is composed of a fixed grate, a movable grate, and projections, the stirring and inversion performance of the dehydrated cake can be greatly improved.

(2) Since the stirring and reversing performance is improved, the drying efficiency is improved and the grate load can be increased.

For this reason, stable drying can be obtained even for a dehydrated polymer cake with a high moisture content, and the range of application of this type of stepped drying stoker is expanded.

(3) Since the protrusions are provided, the height of the dehydrated cake can be increased without increasing the height of each grate.

Therefore, there is no need to increase the overall height or inclination angle of the stepped drying stoker, making it compact.

(4) Since the protrusions are provided, the migration distance of the dehydrated cake becomes longer, the layer thickness of the dehydrated cake does not increase accordingly, and air permeability improves.

(5) Since the protrusions are provided, it is possible to prevent the dehydrated cake from flowing down and the grate surface of each grate can be always protected by the dehydrated cake, thereby further preventing burnout of each grate.

(6) Since only the protrusions are provided, the structure is simple and can be easily applied to existing ones.

(7) Since each grate is approximately horizontal and the rear surface of the protrusion is gently sloped, the rear surface of the protrusion is essentially gently sloped, allowing the dehydrated cake to be pushed out smoothly and dried without being compressed. is carried out well.

(8) Since each grate is approximately horizontal and the front surface of the protrusion is steeply sloped, the front surface of the protrusion is substantially steeply sloped, allowing the dehydrated cake to fall quickly and stirring and reversing to occur quickly. It is done.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing a step-type drying stoker according to an embodiment of the present invention, and FIGS. 2 to 4 are similar views showing the operating state thereof. 1...Step-type drying stoker, 2...Fixed grate, 3...Movable grate, 4...Protrusion.

Claims (1)

[Scope of utility model registration request] In a stepped drying stoker for drying a dehydrated cake, the upper surfaces of the fixed grate and the movable grate are flat, and the upper surfaces of the fixed grate and the movable grate are approximately horizontal and arranged alternately in a stair-like manner to dry the dehydrated cake. A stepped drying stoker characterized in that a protrusion having a steeply sloped front surface and a gently sloped rear surface is formed on the front side of one of the upper surfaces.