JPS60223916A - Inverted and diffused flame burner - Google Patents

Abstract

PURPOSE:To contrive smooth ignition, by providing a device sending partly premixed air-fuel mixture for ignition time in a combustion chamber. CONSTITUTION:Combustion gas is injected through an injection opening 8 by entering through a gas flow path 1 and separated partly at an inlet 4 as the gas for ignition time. The separated gas is turned into a premixed air-fuel mixture by flowing air in the separated gas through an air inlet 5, led into a combustion chamber 3 through an outlet 6 and ignited by an igniter 9. The combustion air is led to the combustion chamber 3 from a combustion air outlet 7 through a combustion air flow path. In other words, the titled burner is a device in such constitution that a partly premixed air-fuel mixture and the air are taken out from separate routes at the time of ignition and then they are ignited.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gas combustor, and more particularly to a combustor that burns in an inverted position.

More specifically, the present invention relates to a combustor used in a combustion section of an external combustion engine such as a Stirling engine.

Conventional configurations and their problems The main purpose of external combustion engines such as the Stirling engine is to increase their power efficiency as much as possible, and this is governed by Carnot's law. Therefore, the larger the temperature difference between the high temperature section and the low temperature section, the higher the efficiency. Generally, helium is used as the working medium, and the temperature of the high temperature part is 600℃.
'C to 800'C. Therefore, no matter how much the efficiency of the combustion section is increased, the temperature of the exhaust gas will be 600'C to 800'C.
If the temperature exceeds OO°C and we want to increase overall efficiency, we must recover and use as much of the waste heat as possible. Generally, this waste heat is used to preheat the combustion air.
It is designed to increase overall combustion. At this time, the temperature of the preheated air is close to 600°C to 800'C, so premixed combustion is dangerous, so a diffusion combustion method is used.

In the case of a Stirling engine, a crank is provided to convert vertical motion into rotational motion. Therefore, from a structural standpoint, the combustion part is located at the top, creating what is called an inverted fire UK. At this time, in the case of an inverted combustor with diffusion combustion,
Due to poor mixing of gas and air during ignition, it is difficult to ignite with electric discharge type igniters.
When the air mixture becomes rich, the air often ignites and begins to burn, resulting in a kind of explosion that is noisy and can be dangerous.

OBJECTS OF THE INVENTION The present invention solves these problems, namely:
At the time of ignition, the partially premixed gas and air are taken out from another route and ignited.

DESCRIPTION OF THE INVENTION The present invention relates to an inverted diffusion flame combustor used in a Stirling engine or the like, and is characterized in that the combustor is equipped with an ejection port for ejecting premixed gas.

DESCRIPTION OF EMBODIMENTS FIG. 1 shows the configuration of a combustor according to an embodiment of the present invention. 1st
In the figure, 1 is a gas flow path, 2 is a combustion air flow path, and 3 is a combustion chamber. 4 and 5 are gas and air inlets for ignition, 6 is an outlet, 7 is a combustion air outlet, 8 is a combustion gas injection port, 9
is the igniter.

In FIG. 1, combustion gas enters from a gas flow path 1, is injected from an injection port 8, and is partially separated at an inlet 4 as a gas for ignition. Air flows into the separated gas from an air population 5 to form a premixed gas, which is guided into the combustion chamber 3 via an outlet 6 and ignited by an igniter 9. Further, the combustion air is guided from the combustion air lower to the combustion chamber 3 via the combustion air flow path.

FIG. 2 shows the combustion section of a Starlink engine using an inverted flame burner, which is an embodiment of the present invention. In the figure, 11 is a gas passage, 12 is a combustion air passage 16
13 is a combustion chamber, and 14 is a heating section of the Stirling engine body.

Reference numeral 16 denotes an exhaust gas outlet passage, through which heat is exchanged between the exhaust gas and combustion air, the combustion air is heated and enters the combustion chamber 13, and the exhaust gas is heat exchanged and discharged outside. 1
Reference numeral 7 denotes a premixed gas passage for ignition, which is branched from the gas passage 11 and has an air inlet 2° in the middle.

Note that this mixed gas passage 17 may have a means for stopping either the gas or the air when the temperature of the combustion air becomes high. This is because when the temperature of the combustion air exceeds the flash point of the gas, combustion may begin within the air-fuel mixture pipe. Furthermore, if this tube is made of a heat-resistant material such as ceramic, there will be no adverse effect even if it is burned in the mixer, so the above-mentioned means can be omitted. Reference numeral 18 denotes a spark plug, which is installed very close to the mixed gas outlet 17. 19 is a heat insulating agent. That is, to explain the operating principle of this embodiment,
First, combustion air enters through the passage 16 by means of a blower fan and enters the combustor 13 through the passage opening 12 .

Next, the gas cock is twisted, and combustion gas is introduced into the combustion chamber 13 through the gas flow path 11. At this time, a part of the premixed gas passage 17 is branched off. The combustion gas and air enter the passage 17 through the opening 20, and are premixed with the combustion gas and air. Ignition occurs smoothly. That is, the gas mixed with the air coming out from the outlet of the premixed gas passage 17 is set within a sufficiently flammable range, and will immediately ignite if an ignition source is present. The heat then ignites the main gas and begins combustion. Without this premixed air-fuel mixture, the mixture of air and gas would be poor during ignition in the combustion chamber, resulting in a phenomenon in which ignition would not occur unless the amount increased to a certain extent. At this time, since a large amount of gas starts to burn at once, a kind of explosion phenomenon may occur, which may be dangerous, but this does not occur with the above configuration.

Effects of the Invention As mentioned above, the present invention provides an inverted diffusion combustion combustor,
By providing a means in the combustion chamber for passing the partially mixed ignition air-fuel mixture, smooth ignition can be achieved.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an inverted diffusion flame combustor according to an embodiment of the present invention, and FIG. 2 is a block diagram of essential parts when the combustor shown in FIG. 1 is applied to a Stirling engine. 1. Gas flow path, 2... Air flow path, 3...
・Combustion chamber, 6... Premixed gas outlet, 7...
Air outlet, 8... Gas outlet, 9... Spark plug. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (2)

[Claims] (1) An inverted diffusion flame combustor, characterized in that the inverted diffusion flame combustor is equipped with an ejection port for ejecting premixed gas into the combustor. (2) The inverted diffusion flame combustor as set forth in claim 1, further comprising a spark plug provided immediately above and near the ejection port from which the premixed gas is ejected.