JPS60137866A - Burner plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a burner plate (K) used in gas combustion equipment and oil combustion equipment.

Structure of conventional examples and their problems Conventionally, this type of burner plate has been made mainly of ceramics such as sillimanite or silicon oxide, which is generally called a schbank burner, and one mainly made of ceramic fibers. be. The former is press molding using a mold,
In the latter case, the slurry is poured over the entire surface or a part of the plate material to form combustion holes with a diameter of about 1 inch and an aperture ratio of 40 to 45.
It is manufactured by forming a hairstyle or a square pyramid-shaped or dome-shaped protrusion on the plate surface and firing it.

In other words, by adopting a raw material with low thermal inertia, low thermal conductivity, and high heat exchange intensity, and at the same time, by providing a convex part on the plate surface, etc., (1) accelerate the speed at which the flame becomes fully operational; , (2) emit radiant energy forward and reduce heat loss to the rear, and (3) eliminate temperature unevenness on the plate surface. However, all of them have the following problems, and their solution is desired.

(1) A large amount of carbon monoxide and nitrogen oxides are generated during combustion. (2) The amount of heat generated is small during combustion, resulting in combustion noise and an increase in CO.

(3) The rise time until complete combustion is long.

(4) Low surface temperature and brightness.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an h-burner plate that eliminates the above-mentioned conventional disadvantages and is easy to manufacture.

It is made of magnesium oxide, silicon carbide, and lime aluminate as a binder, and is formed into a honeycomb shape with many combustion holes.

This burner plate is manufactured as follows. That is, after adding cellulose derivatives and oils and fats as molding aids to the above materials, adding water to the mixture and kneading,
It is extruded into a honeycomb shape, solidified, dried, and fired. Next, continuous protrusions such as squares are formed on the surface.

As mentioned above, the burner plate of the present invention uses lime aluminate with low thermal conductivity as a binder, and uses heating,
It has excellent heat resistance because it uses fused silica to reduce expansion and contraction caused by the thermal cycle of cooling, magnesium silicate for heat transfer conductivity, and silicon carbide to increase heat resistance strength. Because the thermal conductivity is low, the rise time is short and the surface temperature is high.

In addition to being able to be manufactured without sintering, the porosity is increased by extrusion molding of the mixture with water, and the actual surface area is 2 times larger than that of molding with a mold press or cast molding.
It can be increased by 0 to 25%, and therefore, the length of the flame is shortened, making it easier to replenish oxygen, reducing the generation of CO and NOx, and increasing the entire variable range of calorific value. Furthermore, extrusion molding provides uniform density and eliminates color unevenness when heated.

The preferred composition of the donor plate of the present invention is as follows.

Melt-treated silica 20-40 parts by weight Magnesium silicate 6-26' Silicon carbide 1-10'' Lime aluminate 30-60 Description of Examples Examples of formulations of raw materials for burner plates are shown in the following table.

Table 1: First, the above-mentioned additives A1 to A5 were dry mixed, while 76.6
．． Dissolve the powder in step 7 in water. Then, the latter solution is mixed with the former mixture and thoroughly kneaded.

After completely deaerating and kneading this mixture in a vacuum kneading machine, it is extruded, cut into appropriate thicknesses, cured at 6080°C to solidify the cement, and then fired at a temperature of 600 to 1000°C. do. One side of the honeycomb-shaped plate thus obtained is masked with a metal plate, etc., and then sandblasted.

The first example of the burner plate obtained by K t as described above is
- Shown in Figure 2. 1 is a combustion hole, 2 is a partition wall that partitions hole 1,
3 is a concave portion cut by the above-mentioned sandblasting process, and 4 is a convex portion. The hole 1 is a 1tttm square, the thickness of the partition wall 2 is 0.4 MIIJ, and the protrusion 4 is 4 mm.
It consists of several holes and a partition wall surrounding them. The thickness of the plate is 13 mm.

The following table shows a comparison of the physical properties of the burner plate A according to the present invention described above and the conventional Schwank burner B mainly made of sillimanite (Al12sios) and 5102.

Table 2 Next, using the burner plates A and B described above, L P
G Burn (04H, o) and control the gas consumption needle A
The CO/CO2 in the combustion exhaust gas and the surface temperature of the plate were measured. The results are shown in FIG.

Well, the rise time from ignition to complete combustion is 3.
minute, B was 5 minutes.

Next, the composition shown in Table 1 excluding silicon carbide was set as 100, and the heat resistance strength and mechanical strength of the compositions to which silicon carbide was added in various proportions were measured. The result is the fourth
As shown in Fig. and Fig. 6. The heat resistance strength was evaluated by the presence or absence of cracks after being left at each temperature for 200 hours, and the mechanical strength was determined by applying pressure to the convex part of the plate with a tension gauge and measuring the pressure at which the plate broke.

Effects of the Invention As described above, according to the present invention, it is possible to create a burner plate that has excellent thermal properties and can raise the surface temperature. Moreover, since it is a non-sintered type, it is easy to manufacture, and its properties as a burner plate can be improved by extrusion molding.

[Brief explanation of the drawing]

Fig. 1 is a plan view of burner plate 1 according to the embodiment of the present invention, Fig. 2 is a side view of the main part in cross section, and Fig. 3 is gas consumption and burner surface temperature during a burner plate combustion test. Figure 4 is a diagram showing the relationship between the addition ratio of silicon carbide and heat resistance strength, and Figure 6 is the relationship between the addition ratio of carbon l arsenic and mechanical strength. FIG. 1... Hole, 2... Partition wall, 4...
・Convex part. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 2 Figure 3 Gas droplet yellow amount (tccd/hF) Figure 4, S'/'C blade counterfeit force Rowariji (//66n Figure 5

Claims (2)

[Claims] (1) Melt-treated silica and magnesium silicate. A burner plate made of silicon carbide and lime aluminate as a binder and shaped into a honeycomb shape with many combustion holes. (2) A composition comprising 20 to 40 parts by weight of silica, 5 to 26 parts by weight of magnesium silicate, 1 to 10 parts by weight of silicon carbide, and 30 to 60 parts by weight of lime aluminate. The burner plate described in item 1.