JPS58193313A - Combustion furnace - Google Patents

Abstract

PURPOSE:To provide a combustion furnace enhanced in heat efficiency, constituted from such a structdure that the exhaust gas of a burner blowing out a combustion flame is passed through a gas permeable solid while the part of said gas passed therethrough is recirculated to raise the temp. of said gas permeable solid. CONSTITUTION:In a combustion furnace wherein an object (a) to be heated sent thereinto from an inlet is heated while conveyed to the direction of an arrow and subjected to heat treatment to be taken out an outlet 3, a burner 6 having a tapered cylindrical ejector 7 attached to the pierced hole provided by drilling to a gas permeable solid 4 provided in order to preheat the object (a) to be heated by radiant heat is arranged other than burners 2, 2 provided to the furnace wall. From the gap 10 between a combustion air supply pipe 8 having a fuel supply pipe 11 passed through the center thereof and the upper end oppening part 9 of the above-mentioned ejector 7, the exhaust gas from the burners 2, 2, 6 is flowed through the gas permeable solid 4 to heat the same and the passed gas is sucked from a flue 5 to be recirculated into the furnace. By this structure, the amount of the gas passed through the gas permeable solid 4 is increased and a large amount of heat can be sucked in.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion furnace in which the combustion energy contained in combustion exhaust gas is effectively used to heat objects.

A conventional combustion furnace is equipped with a burner inside the furnace, and the combustion flame blown out by the burner and the sensible heat of the combustion exhaust gas heat the objects to be heated inside the furnace. It is made to be discharged to the outside. In this type of combustion furnace, #heating material made of metal or ceramic is used in the form of a mesh.

This can be achieved by placing a honeycomb-shaped, III-shaped, cone-shaped, ◆porous, etc.-shaped sW-formed solid (hereinafter referred to as an air-permeable solid) in the flue gas passage in the furnace. W in a permeable solid - current # flowing through the flue gas
Heating a permeable solid to a high temperature by conduction and using the thermal energy radiated from the high-temperature permeable solid to heat the object placed inside the furnace facing the permeable solid improves thermal efficiency. It is already known as a very effective means to improve your skills.

The present invention aims to improve this and further improve the thermal efficiency of this part.Examples of the present invention will be described below with reference to the drawings.

The combustion furnace shown here transports the heated material a from the inlet 1 into the furnace W-
The object to be heated is transferred in the direction of the arrow and passes through this preheating zone, and a burner is provided on the furnace wall to preheat it. The stone is transported to a heating zone where the combustion flame is blown out into the furnace, and then transported out of the furnace from outlet 1. Stone 4 is a plate-shaped breathable solid stretched horizontally on the ceiling of the furnace. , 5 is the flue, and the burner in the YTR heating zone! The flue gas generated in the combustion chamber flows into the preheating zone as shown by the broken line arrow, flows through the permeable solid 4 in the ceiling, passes through the flue 6, and is discharged to the outside.

6 is a burner installed vertically in the center of the air-permeable solid 4, and as shown in the figure, a through hole is bored in the center of the air-permeable solid 4, and a downward W: granite is inserted into the through hole. A tapered ejector 7 with an inner diameter gradually increasing in diameter is installed vertically.

Then, insert the tip of the combustion air supply vibe S into the upper end opening 1 of the ejector 7! g! so that there is a gap between the outside of the air supplying vibrator 1 for 8-burning and the inner wall surface of the ejector 7. Let it happen. Further, a fuel supply vibrator (2) is arranged at the center of the combustion air supply vibrator 8, and the tip of the nuclear fuel supply pipe U is provided so as to protrude from the tip of the combustion air 9c supply pipe 8 at most.

In the incinerator of the present invention constructed as described above, the combustion exhaust gas generated in the burner 2 of the heating zone is made to flow through the air permeable solid 4, thereby transmitting the amount of heat of the combustion exhaust gas to the air permeable solid 4, and transmitting the solid radiant heat. Give to heated object. The combustion exhaust gas that has passed through the gas permeable solid 4 lowers its temperature and flows out toward the flue 6.

On the other hand, since the flue 5@ of the gas-permeable solid 4 and the suction side of the burner 6 are communicated through the gap 1o as described above, part of the combustion exhaust gas after passing through the gas-permeable solid 4 is is sucked into the ejector 7 through this interjaw, and is blown out into the furnace again when the combustion flame stops. Therefore, the breathable solid 4
The amount of flue gas that flows through the air-permeable solid increases, and a greater amount of heat can be extracted from the air-permeable solid. The breathable solid 4 heated to a high temperature in this way is #1ell! Radiant heat is radiated from the side facing the material island to heat the heated material.

In addition, as shown in this example, combustion exhaust gas can be
Inhaling the smoke of a breathable solid 4.
In order to work to lower the gas pressure on the side, the pressure difference with the inside of the furnace increases, which has the effect of increasing the amount of combustion exhaust gas passing through the gas permeable solid 4.

In addition, the above! l! In the example, the burner was installed in the center of the breathable solid, but the present invention is not limited to this.
For example, by providing a burner separate from the air permeable solid and communicating the burner with the flue side of the air permeable solid through a duct, a portion of the combustion exhaust gas that has passed through the air permeable solid is passed through the duct to the burner. It may also be made to be sucked into.

As explained above with respect to the embodiments, the combustion furnace of the present invention has the following features:
The furnace is equipped with a burner that blows out a molten flame, and the combustion exhaust gas of the burner is made to flow through the air permeable solid and discharged from the flue, and the flue side of the waste air solid is connected to the burner. The amount of the combustion exhaust gas passing through the air permeable solids is reduced by communicating with the exhaust gas suction side of the combustion exhaust gas and causing a part of the combustion VP gas that has passed through the air permeable solids to be sucked into the burner and forcibly recirculated into the furnace. Since K is set so as to increase
It has the advantage of being able to absorb a larger amount of thermal energy from the combustion exhaust gas into the breathable solid, making it more efficient (: heating the object to be heated).

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an embodiment of the present invention. a... Heated object, 2.6... Burner, 4...
Breathable solid, 5... flue. Patent applicant: Daido Steel Co., Ltd.

Claims (1)

[Claims] In a combustion furnace, the furnace is equipped with a burner that blows out a combustion flame, the combustion exhaust gas of the burner is made to flow through an air-permeable solid and discharged into a flue, and an object to be heated is placed facing the air-permeable solid. , the flue side of the air permeable body is communicated with the exhaust gas suction side of the burner, and a part of the combustion exhaust gas after passing through the air permeable solid is transferred to the burner c'P! A combustion furnace characterized by having m rings.