JPH053862Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention uses coal as a slurry.
CWM (Coal Water Mixture), COM (Coal Oil
This relates to internal mixing burners for solid-liquid mixed fuels such as CMS (Coal Methanol Slurry) and CMS (Coal Methanol Slurry).

[Conventional technology] CWM (Coal
Solid-liquid mixed fuels (slurry fuels) such as water mixtures are used. Slurry fuel is used for combustion devices such as boilers because it has the advantage of being able to handle coal as a fluid.

Figures 3 and 4 show an example of an internal mixing type slurry fuel burner, in which a slurry introduction part 3 is formed at the axial center inside a burner plate 2 having a burner chip 1 at its tip, and the slurry A plurality of plate nozzle holes 4 for injecting steam are concentrically formed on the outer periphery of the introduction section 3, and the slurry introduction section 3 and each plate nozzle hole 4 are communicated with each other through a fuel hole 5 to introduce the slurry. By introducing the slurry fuel from the section 3 into the plate nozzle hole 4 through the fuel hole 5, it is atomized and mixed by steam, and is further injected from the burner nozzle hole 7 through the mixing chamber 6 of the burner chip 1. This causes combustion to occur.

In such internal mixing type slurry fuel burners, the capacity of each burner has been increased in recent years as boilers have become larger, but in this case, increasing the diameter of the plate nozzle hole 4 increases the overall size of the burner. In order to increase the diameter and weight, two or more rows of plate nozzle holes 4a, 4b are arranged concentrically as shown in FIGS. 3 and 4.
The fuel holes 5a, 5b of the same diameter are connected between the respective plate nozzle holes 4a, 4b and the slurry introduction part 3.
This is an attempt to increase the capacity of the burner without making the burner structure too large.

[Problem to be solved by the invention] However, in the above conventional system, the inner and outer plate nozzle holes 4a, which are arranged in a plurality of concentric rows,
4b and the slurry introduction part 3, the length l ₁ ,
Fuel holes 5a, 5 of the same diameter although l ₂ are different
Since the connection is made at
Concentrations of fuel occur within the burner nozzle hole 7, and the fuel ejected from the burner nozzle hole 7 becomes non-uniform, resulting in a problem of deterioration of combustibility.

The present invention was developed by focusing on the above-mentioned conventional problems.In an internal mixing type slurry mixing type burner having multiple concentric rows of plate nozzle holes in the burner plate, the slurry is introduced into each plate nozzle hole. The purpose is to equalize the fuel flow rate.

[Means for Solving the Problems] The present invention is an attempt to solve the above technical problems, and includes an internal mixing device having a plurality of plate nozzle holes in the burner plate at different intervals from the slurry introduction part. In this type of slurry fuel burner, the diameter of the part where the connection interval between the slurry introduction part and the plate nozzle hole is small is made small, and the diameter of the part where the connection interval is large is made large to maintain the same fuel flow rate. The present invention relates to a burner characterized by having a fuel hole.

[Function] Therefore, in the present invention, by changing the diameter of each fuel hole that connects the slurry introduction part and the plate nozzle hole in accordance with the length of the interval, the amount of fuel supplied to each plate nozzle hole is changed. Fuel flow rate can be maintained uniformly.

[Examples] Examples of the present invention will be described below based on the drawings.

Figures 1 and 2 show an embodiment of the present invention.
In the drawings, the same reference numerals as in FIGS. 3 and 4 represent the same parts.

As shown in the figure, in an internal mixing type slurry fuel burner having a plurality of concentric rows of plate nozzle holes 4a, 4b in a burner plate 2, a small Connected by a small diameter fuel hole 8a having a diameter _t1 ,
The outer plate nozzle hole 4b and the slurry introduction part 3 are connected by a large-diameter fuel hole 8b having a diameter t ₂ larger than the small-diameter fuel hole 8a.

In the above, the length of the fuel holes 8a and 8b is l,
If the diameter is d, the pressure is ΔP, and the fuel flow rate is V,
In Newtonian fluids (oil, water, etc.), ΔP∝l ΔP∝V ² ∝1/(d ² ) ² →d∝1/{(ΔP) ¹ / ² } ¹ / ² .

Therefore, if l doubles, ΔP needs to be halved, so if d is made 1.19 times, ΔP will not change.

Looking at this in the case of CWM, which is a non-Newtonian fluid, ΔP∝l ΔP∝V ^1.6 ∝1/(d ² ) ^1.6 →d∝1/{(ΔP) ^1/1.6 } ¹ / ² .

Therefore, if l doubles, ΔP needs to be halved, so if d is set to 1.24 times, ΔP will not change.

In this way, the diameter t ₁ of the short fuel hole 8a connected to the plate nozzle hole 4a near the slurry introduction section 3 is made small, and the diameter t1 of the short fuel hole 8a connected to the plate nozzle hole 4b far from the slurry introduction section 3 is reduced. long fuel hole 8b
The plate nozzle hole ₈ is
By changing the apertures of a and 8b in accordance with their lengths, the flow rate of fuel supplied by each fuel hole 8a and 8b can be made uniform, and therefore the fuel injected from burner nozzle hole 7 can be made uniform. can be made uniform and stable combustion can be achieved.

It should be noted that the present invention is not limited to the above embodiments, and that the plate nozzle holes may be arranged on three or more concentric circles, or may be arranged at positions off the concentric circles. , and other various modifications may be made without departing from the gist of the present invention.

[Effects of the invention] As described above, according to the burner of the invention, by changing the diameter of each fuel hole connecting the slurry introduction part and the plate injection hole in accordance with the length of the interval, Since the fuel flow rate supplied to each plate nozzle hole is maintained uniformly, it is possible to achieve a large capacity with a compact burner structure, while uniformly injecting slurry fuel for good combustion. It can be effective.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view showing an embodiment of the present invention;
2 is a view taken along the - arrow in FIG. 1, FIG. 3 is a cutaway side view showing an example of a conventional burner, and FIG. 4 is a view taken along the - arrow in FIG. 1 is a burner chip, 2 is a burner plate, 3 is a slurry introduction part, 4a, 4b are plate nozzle holes, 6
is a mixing chamber, 7 is a burner nozzle hole, 8a is a small diameter fuel hole,
8b indicates a large diameter fuel hole.

Claims (1)

[Scope of utility model registration request] In an internal mixing type slurry fuel burner in which a plurality of plate injection holes are provided in the burner plate at different intervals from the slurry introduction part, the diameter of the portion where the connection interval between the slurry introduction part and the plate injection holes is small is determined. A burner characterized by having a fuel hole that is small and has a large diameter at a portion with a large connection interval to maintain the same fuel flow rate.