JPH02183708A - Burner - Google Patents

Abstract

PURPOSE:To provide a uniform temperature distribution in a combustion chamber by providing a porous solid body wall which has open holes facing to a combustion furnace and defining and forming a combustion chamber with a burner, porous solid body and outer cylinder and providing an ignition device on the side wall of the combustion furnace. CONSTITUTION:In the inside of an outer cylinder 1 a burner 2 is provided. On the downstream side of the burner 2 a porous solid body wall 3 with an open hole 6 is installed, and a combustion chamber 12 is defined and formed by the outer cylinder 1, burner 2 and porous solid body wall 3. On the side wall 10 of a combustion furnace 4 a burner 5 for ignition is slidably mounted. A combustion frame 11 is formed by bringing the tip end of the ignition burner 5 near the open hole 6 of the porous solid body wall 3 and fuel gas 8 and air 9 are supplied to the ignition burner 5. When a premixture gas 7 of a low calorific value gas and air is supplied through the porous solid body of the burner 2, the temperature of the premixture gas 7 is raised above its ignition temperature and combustion is started. Since the outer cylinder 1 which constitutes the combustion chamber 12 requires no hole piercing, the inside of the combustion chamber 12 has a uniform temperature distribution and the continuation of the combustion is assured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a combustion device suitable for burning gas with a low calorific value.

[Conventional technology]

An example of a conventional combustion device will be explained with reference to FIG.

The combustion device has a downstream outlet of a combustion chamber 03 to which fuel and air o1 are supplied and where the fuel is combusted by a parer 02.
A porous solid (radiant porous material) covers the entire cross section of the same outlet.
Wall 04 is installed. In this combustion device, the porous solid 04 is red-hot by the combustion flame, and the radiant heat is directionally returned to the flame side of the Pana as shown by the arrow in Figure 1, so even fuel with a low calorific value can be heated to a sufficiently high temperature. Completely burned.

The exhaust gas 05 passing through the radiation porous body 04 and flowing downstream therefore flows out at a low temperature.

[Problem to be solved by the invention]

The conventional combustion apparatus described above has the following problems.

(1) In order to ignite Pana, it is necessary to make a hole in the side wall of the combustion chamber and insert an ignition device.

When the combustion chamber is small, the proportion of holes is large, resulting in large heat radiation losses, making it difficult to maintain the combustion temperature, and the temperature distribution changes at the holes, making combustion uneven.

(2) Since the entire outlet of the combustion chamber is covered with a porous solid, it is subject to sudden strong wind pressure, especially at the time of initial ignition, and the porous solid is easily cracked.

The present invention seeks to overcome the drawbacks of the above-mentioned conventional combustion devices.

[Means to solve the problem]

The combustion apparatus of the present invention includes a perna inside the outer cylinder and a porous solid wall having openings facing the combustion furnace on the downstream side of the perna,
A combustion chamber was defined by the parna, the porous solid, and the outer cylinder, and an ignition device was provided on the side wall of the combustion furnace connected to the outer cylinder.

[Effect]

In the present invention, a combustion flame is first formed by the ignition device, and this ignites the fuel supplied from the Pana into the combustion chamber, thereby starting combustion.

The outer cylinder does not require a hole for inserting the ignition device, and the combustion temperature field in the combustion chamber, which is partitioned by the outer cylinder, the parner and the porous solid wall, is a region with little turbulence. Uniform temperature distribution ensures combustion.

! 9. Since the porous solid wall facing the combustion furnace has openings, it is possible to ignite even if the ignition device is placed outside the combustion chamber on the combustion furnace side, and at the time of initial ignition, etc. Since the wind pressure fluctuates through the main opening and flows into the combustion furnace, cracks are prevented from forming in the porous solid wall.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Inside K of outer cylinder 1 made of steel, fireproof material, etc.

A Pana 2 made of a porous solid is provided, and a porous solid (radiation porous solid) wall 3 with openings 6 is attached (7) on the downstream side of the Pana 2. 1. A combustion chamber 12 is defined by a parer 2 and a porous solid wall 3. The outer cylinder 1 is a combustion furnace 4 made of a refractory material 10.
The porous solid wall 3 faces the combustion furnace 4, and the openings 6#i of the combustion chamber 12 communicate with the combustion furnace 4. An ignition purer 5 to which fuel gas 8 and air 9 are supplied is slidably attached to the side wall 10 of the combustion furnace 4. It is now possible to enter close to the opening 6 of No. 3.

The ratio M of the area between the porous solid a3 and the openings 6 is as follows: M=area of the openings 6, /(area of the porous solid wall 3+area of the openings 6), and the value obtained is M≧ It is set to satisfy 0.1. Further, the shape of the porous solid 3 and the shape of the openings 6 may be arbitrary, but in the illustrated example, a disk shape is adopted.

In this embodiment having the above configuration, the tip of the ignition parlor 5 is brought close to the opening 6 of the porous solid wall 3 in the combustion furnace 4, and the fuel gas 8 and air 9 are supplied to the ignition parna 5. ,
A combustion flame 11 is formed. Next, when a premixed gas 7 consisting of a gas with a low calorific value and air is supplied by passing through the porous solid of the Parna 2, the combustion flame 11 raises the temperature of the premix 7' to above the ignition temperature and combustion begins. do.

When the combustion chamber 12 is large and has sufficient residence time compared to the time required to complete combustion of the premix 7', the combustion chamber 4 is
A small amount of flame flows out, but if the residence time is insufficient, a long flame flows out and combustion is completed in the subsequent combustion furnace 4. When the premixed gas 7 becomes natural, the ignition parner 5 is pulled out of the combustion furnace 4.

As described above, in this embodiment, the ignition device 5 can reliably ignite the premixed gas. In addition, since wind pressure fluctuations during ignition can be released through the openings 6 in the porous solid wall 3 on the combustion f side, cracks do not occur in the porous solid wall 3 and the combustion chamber 12
Since the outer cylinder 1 constituting the outer cylinder 1 does not require perforations, the outer cylinder 1. Combustion chamber 1 formed by Pana 2 and porous solid wall 3
2 has a uniform temperature distribution, so that reliable combustion can be continued.

In addition, in the area of the opening 6 in this embodiment, if the above-mentioned value of M is 10% or more, it is possible to reduce the influence of wind pressure due to transient fluctuations in load at the time of initial ignition or during operation.

Further, in this embodiment, the parner 2 is made of porous solid, but it may be made of a normal steel parner. Further, although the ignition device 5 is used as the ignition device, an electric heater (resistance heating element) or a laser light emitting device may be used.

〔Effect of the invention〕

As explained above, the present invention can reliably ignite fuel in the combustion chamber, and can also provide a uniform temperature distribution within the combustion chamber, so that combustion can be reliably continued. In addition, it is possible to ignite the ignition device outside the combustion chamber, and wind pressure fluctuations during initial ignition can also escape to the combustion furnace side through the openings in the porous solid wall. Cracks can be prevented from forming in solid walls. ,.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of one embodiment of the present invention, and Fig. ta2 is a longitudinal cross-sectional view of one embodiment of the present invention.
3 is an explanatory diagram showing an example of a conventional combustion device. DESCRIPTION OF SYMBOLS 1...Outer cylinder, 2...Pana, 3...Porous solid wall, 4...Combustion furnace, 5...
Pana for ignition, 6... Opening hole, 10... Combustion furnace side wall, 12... Combustion chamber.

Claims (1)

[Claims] A porous solid wall facing the combustion furnace and having openings is provided inside the outer cylinder, and a porous solid wall facing the combustion furnace is provided on the downstream side of the outer cylinder. A combustion device characterized in that an ignition device is provided on the side wall of a connected combustion furnace.