JPS5826490B2 - gas combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Gas-fired furnaces are often required to rapidly raise the temperature within the furnace to high temperatures.

For this reason, it is common practice to use propane gas, which has a high calorific value, to directly heat a heating plate provided in the center of the hearth with the flame of a gas burner, and to raise the temperature inside the furnace via this heating plate.

However, gas burners emit gas flame by appropriately adjusting the air inlet and gas flow control valve to heat the heating plate to a high temperature. The burner itself heats up and cannot withstand long-term use, so it is necessary to replace it with a new one after using it for a certain period of time.

An object of the present invention is to provide a long-life gas combustion device that can eliminate these drawbacks.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the combustion apparatus according to the present invention, in which 1 is a cylindrical combustion chamber having a circular opening in the hearth;
Reference numeral 2 denotes a polygonal pyramid, for example, an inverted conical disc with a flat upper surface as shown in FIG. 2, and the material is a molded product made of, for example, ceramic fiber.

Reference numeral 3 indicates stands for supporting this polygonal pyramid on the hearth, and in FIG. 3, three stands are arranged at intervals of about 120 degrees at the edge of the opening of the hearth.

4 consists of a cone with a truncated cross-section and forms a mixed gas induction zone.

Reference numeral 5 denotes a heat insulating wall using a heat insulating material such as ceramic fiber, and the inner wall 6 and outer wall 7 are molded products made of the same heat insulating material.

8 indicates a metal net.

At the upper end of the heat insulating wall 5, there is a support stand 9 for supporting the inner lid 10.
They are arranged at 0 degree intervals.

Reference numeral 11 denotes an outer cover, which is provided with four exhaust holes 12 as shown in FIG.

13 indicates a hearth stand. Above 2,3゜4.6,7,9,10
, 11 are all made of molded special heat insulating material.

The gas combustor 14 has a gas control valve 15, but does not require an air inlet.

Now, select the gas pressure of the gas combustor or burner located below the polygonal pyramid 2 of the furnace and the gap between the upper end of the mixing gas induction zone 4 and the polygonal pyramid 2 placed above it, and then turn the burner valve. When the opening is adjusted, the air A mixes with the combustion gas G and is emitted along the periphery of the polygonal pyramid 2 due to the Venturi effect, as shown in FIG. There is no flame above the burner crater.

Therefore, the insulating polygonal pyramid 2 is not heated to a high temperature,
The gas burner placed below it is also hardly heated by radiation conduction.

The flame F is emitted from the periphery of the polygonal pyramid 2 and can heat the inside of the furnace to a high temperature.

What is noteworthy about the present invention is that no air introduction hole is required in the burner, and the amount of mixture with air is determined by adjusting the gas ejection amount and the gap between the gas induction zone 4 and the polygonal pyramid 2 relative to the gas pressure.

FIG. 7 shows the experimental results of measuring the temperature inside the combustion furnace according to the present invention, where the vertical axis shows the temperature inside the furnace in °C, and the horizontal axis shows the elapsed time after ignition.

Curve a shows a temperature rise curve when the gas used is LPG pressure 280±20, nozzle diameter 1.5, and inspection vehicle 75.

Fig. 6 shows another embodiment in which a mixing gas induction zone is provided on the side wall of the furnace.The molten metal inside the furnace is heated when the furnace is overheated or the crucible is damaged. This shows a safety valve that allows water to flow out to the outside.

8 and 9 further show schematic longitudinal sections and cross sections along lines B and B' showing other embodiments of the invention.

17 is a crucible and 18 is a molten alloy. The polygonal pyramid support stand 3 also serves as a crucible stand.

This temperature rise characteristic is shown in FIG.

The molten metal in the crucible is aluminum alloy (AC8B), the crucible is graphite +30, butane gas (C4H10), pressure 280±2
The temperature rise curve at Mt. 0 is shown, and it reaches 700℃ in about 45 minutes.
The melting temperature was measured.

As described above, the present invention has the advantage of increasing the life of the gas combustor or burner and reducing fuel consumption.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a gas combustion furnace according to the present invention, FIG. 2 is a polygonal pyramid for guiding a mixed gas, and FIG. 3 is a line A-A in FIG. 1.
4 is a plan view showing the exhaust hole of the upper cover, and FIG. 5 is an explanatory view showing the gas air intake path and the state of flame generation. FIG. 6 also shows another embodiment of the invention in which air as well as gas are introduced through a mixing gas induction zone in the side wall of the furnace. FIG. 7 shows experimental results showing the temperature rise curve in the furnace according to the present invention. Further, FIGS. 8 and 9 show a longitudinal cross-sectional view and a schematic cross-sectional view taken along the line BB', showing still another embodiment of the present invention. In the figure, 1: combustion chamber, 2: polygonal pyramid, 3: polygonal pyramid support stand, 4: mixed gas induction zone, 5: heat insulating wall, 9:
Inner lid support, 10: Inner lid, 11: Outer lid, 12: Exhaust element L
14: Gas combustor, 17: Crucible, 18: Molten alloy.

Claims (1)

[Claims] 1 Arrange the polygonal pyramid with a slight gap in the opening provided in the gas combustion chamber so that the top of the pyramid faces the gas ejection direction,
A gas mixture induction zone is formed in the opening, and a gas combustor is arranged opposite to the apex of the polygonal pyramid, and air is sucked into the induction zone by the gas pressure, and the gas mixture causes the gas to flow into the polygonal pyramid. A gas combustion device characterized by igniting mixed gas only along the periphery of the body and emitting flame.