JPH063291B2 - Pulse combustion type immersion burner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pulse combustion type immersion burner used in a furnace for liquid heating or metal melting.

[Conventional technology]

As a conventional technique, for example, as shown in FIG. 5 and FIG. 6, in a submerged burner used in a furnace for liquid heating or metal melting, a cylindrical burner (8) 'is used as a heat-resistant external material. Insert the combustion chamber (1) 'into the tube (3)' with the tip part in place,
In the tip mixing chamber (9) 'of the cylindrical burner (8)', fuel gas from the fuel gas supply pipe (5) 'and a combustion air supply pipe are supplied.
Combustion air from (6) 'is supplied and mixed, and the mixture is ignited by a spark from a spark plug (11)', and its tip flame tip (1
The combustion flame is ejected from (0) 'into the combustion chamber (1)', and the combustion exhaust gas is exhausted between the heat resistant outer cylinder (3) 'and the cylindrical burner (8)'.
There is one that is guided to the exhaust port (13) 'via the (12)'.

[Problems to be Solved by the Invention]

In the above conventional immersion type burner, since it is a flame combustion system, it has a low thermal efficiency, and is large in size.
There were drawbacks such as problems in combustion performance.

The present invention has been made in view of the problems of the related art, and after initial ignition can be performed, air supply, explosive combustion,
Utilizing the features of the pulse combustion type burner that repeats self-combustion under the cycle of expansion and exhaust, such as high load combustion property and high thermal conductivity, it has high thermal efficiency, is compact, and has low noise and working environment. The objective is to obtain a pulse combustion type immersion burner that also has excellent combustion performance.

[Means for Solving the Problems]

In order to achieve the above object, in the pulse combustion type immersion burner according to the present invention, in the immersion type burner used for liquid heating or metal melting, the combustion chamber of the mixture of fuel gas and combustion air is used at the initial stage of combustion. Explosive combustion under forced ignition to the internal combustion chamber and forced ignition by the spark plug, and after a lapse of time, self-inhalation due to the negative pressure and self-ignition due to exhaust heat from the combustion chamber, etc. A pulse-combustion burner that self-combusts while repeating the expansion, expansion, and exhaust cycles, and guides the exhaust to a tail pipe section. The invention of claim 1 is a one-way valve section for disconnecting fuel gas and combustion air. Is placed outside a liquid heating furnace or a metal melting furnace, and the combustion chamber section and the tail pipe section are deeply inserted and placed in the furnace so as to be immersed in the furnace with a constant volume ratio, and are placed inside the heat-resistant outer shell, The combustion chamber is located at the tip of the heat-resistant outer shell. Form, the tail pipe section is provided with a heat exchange unit comprising a combustion chamber formed between the heat outside cylinder and burner inner cylinder and tail pipe section to the outermost burner.

Further, in the invention of claim 2, a space for the combustion chamber is present at the tip portion in the order of the fuel gas supply pipe, the combustion air supply pipe, the cooling air pipe, and the tail pipe from the center to the heat-resistant outer casing with the burner main body. Each of them is concentrically inserted and arranged, which is effective for high efficiency and compactness.

The supply of the combustion air is sent by the blower (not shown) via the air chamber (14), but the blower may of course continuously supply the air. Furthermore, the one-way valve (V ₂ ) that intermittently supplies air to the combustion chamber can be omitted by forcibly feeding.

[Action]

Since the pulse combustion type immersion burner of the present invention is configured as described above, for example, when it is used as a heating source of a metal melting furnace, a one-way valve portion for disconnecting fuel gas and combustion air is used as a furnace. If it is placed outside, and the heat exchange part consisting of the combustion chamber part and the tail pipe part is inserted and installed in the furnace, the fuel gas from the fuel gas supply pipe and the combustion air from the combustion air supply pipe Combustion of air-fuel mixture is compulsorily fed to the combustion chamber and explosive combustion is carried out under forced ignition by a spark plug, and thereafter it is automatically sucked into the combustion gas and self-ignited by exhaust heat of the combustion chamber. Using the features of pulse combustion high load combustibility and high thermal conductivity, the self-combustion is repeated while repeating the cycle of gas, explosive combustion, expansion, and exhaust, and the exhaust is guided to the tail pipe. To heat the heat, as in claim 1 When the replacement portion is provided at the tip of the heat-resistant outer shell of the burner, its thermal conductivity is further improved, and in combination with the concentric-circular polymerization of the burner as claimed in claim 2, it is possible to obtain a small-sized furnace having a large melting capacity. Further, according to the arrangement of the first aspect, the one-way valve portion is not exposed to high temperature and exhibits a sufficient pulse combustion function.

〔Example〕

An embodiment of a pulse combustion type immersion burner according to the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the pulse combustion burner is a combustion chamber of a mixture of fuel gas from the fuel gas supply pipe (5) and combustion air from the combustion air supply pipe (6) at the initial stage of combustion. Explosive combustion is caused by forced supply to (1) and forced ignition by the spark plug (8), and after a lapse of time, self-inhalation due to the negative pressure and self-ignition due to exhaust heat of the combustion chamber (1). And air supply,
The exhaust gas is designed to self-combust while repeating the cycle of explosive combustion, expansion, and exhaust, and the exhaust gas is guided to the tail pipe (2). However, in the embodiment of claim 1, the one-way gas for shutting off the fuel gas is used. The valve (gas flapper valve) (V ₁ ) is installed in the gas introduction pipe (9) connected to the upper end of the fuel gas supply pipe (5), and is pressure-equalized in the gas chamber (10) provided on the upstream side. The fuel gas is supplied from the fuel gas supply pipe (5) to the mixing chamber (12) through the distributor (11) at the tip of the fuel gas supply pipe (5) by the automatic opening / closing operation of each _one- way gas valve (V ₁ ) in each combustion cycle. It has become. In addition, a one-way air valve (air flapper valve) (V ₂ ) for shutting off the combustion air is installed at the upper end of the combustion air supply pipe (6) to introduce air from a starter blower (not shown). Built in the air chamber (14) that can be branched and connected to the pipe (13), the air chamber (1
The combustion air whose pressure is equalized in 4) is automatically opened / closed for each combustion cycle of the one-way air valve (V ₂ ) by the combustion air supply pipe.
It is supplied to the mixing chamber (12) via (6). The one-way gas valve (V ₁ ) and the one-way air valve (V ₂ ) are placed outside the liquid heating furnace or the metal melting furnace (A), and the combustion chamber
A cooling air pipe (7) which is separated from (1) and which is branched and connected to the air introduction pipe (13) outside the combustion air supply pipe (6).
The inner cylinder of the burner (4), and the inner cylinder of the burner
A combustion chamber (1) in which a tail pipe (2) is formed between the heat resistant outer casing (3) and the tail pipe (2) is provided at the tip of the heat resistant outer casing (3) made of ceramics or the like. And the combustion chamber (1) and the tail pipe (2) are formed with a certain volume ratio that is indispensable for pulse combustion. A heat exchange section that is inserted into the outer case (3) and that comprises the combustion chamber (1) and the tail pipe (2)
(B) is provided at the tip of the burner.

Further, in the embodiment of claim 2, the burner comprises a heat-resistant outer shell (3) from which fuel is supplied from the center of the pipe (5), a combustion air supply pipe (6), a cooling air pipe (7), and a tail pipe (2). ) Are concentrically superposed and inserted so as to be inserted, and the spark plug (8) is inserted through and supported by the fuel gas supply pipe (5) in the central portion to face the combustion chamber (1). The cooling air pipe (7) has a partition wall.
The cooling effect of the burner inner cylinder (4) and the like is doubled by providing (15) so that the air branched and flowing from the air introduction pipe (13) bypasses the cooling air pipe (7). In the figure, (16) is a frame top provided at the outlet of the mixing chamber (12), (17) is a nozzle cylinder that promotes the flow of air-fuel mixture into the combustion chamber (1), and (18) is a tail pipe (2 ) Is the exhaust port.

However, in the early stage of combustion, the fuel gas ejected from the gas distributor (11) through the one-way gas valve (V ₁ ) and the fuel gas supply pipe (5) from the gas chamber (10) and the starter blower to the air chamber. (14), one way air valve
(V ₂ ) and the combustion air supplied through the combustion air supply pipe (6) are mixed in the mixing chamber (12), and the air-fuel mixture passes through the flame trap (16) to the combustion chamber (1). It is forcibly fed by the air pressure from the starter blower, etc., and it is forcibly ignited by the spark from the spark plug (8) to explode and burn, but after a gradual passage, that is, the explosive combustion operation becomes normal. After about a few seconds have passed until the start, the rotation of the starting blower is stopped, the spark from the spark plug (8) is also stopped, and thereafter the self-intake and the combustion chamber due to the negative pressure during exhaust of the combustion cycle The cycle of air supply, explosive combustion, expansion, and exhaust under self-ignition due to exhaust heat of (1), for example, 1
It self-combusts continuously while repeating about 80 to 100 times per second, and its combustion exhaust gas is guided to the tail pipe (2) and the heat exchange section (B) consisting of the combustion chamber (1) and the tail pipe (2) is Pulse combustion is performed by heating and raising the temperature to release heat.

FIG. 3 and FIG. 4 show an example in which the pulse combustion type immersion burner according to the present invention is applied to a heating source of an aluminum melting furnace, and a one-way valve part (V
₁ ) and (V ₂ ) are exposed to the upper part of the melting furnace (A), and the heat exchange part (B) consisting of the combustion chamber part (1) and the tail pipe part (2) is immersed in the furnace. The tailpipe (2) exhaust port (18) is made of aluminum and ingot (19).
The exhaust gas from the burner preheats the aluminum and ingot so that they enter the molten metal (a). The heat exchanging part (B) immersed in the molten aluminum (a) is heated by the pulse combustion according to the above-mentioned theory and heated from the inside of the molten metal to present the heat flow (b) in the molten metal. The high-quality molten metal can be obtained with high efficiency and stable melting rate and hot water temperature in combination with preheating by. In addition, since it uses a pulse combustion submerged burner with a high thermal conductivity and a specially designed burner, it has a small melting capacity and a large melting capacity. The quantity is small, the noise is low, and the working environment is good.

〔The invention's effect〕

Since the present invention is configured as described above,
The following effects are achieved.

Since it is a pulse combustion type immersion type burner with features such as high load combustion property and high thermal conductivity, the combustion chamber load is 1/5 to 1/10 compared to the conventional flame combustion type burner, and Since the thermal conductivity is 3 to 4 times that of the conventional one, it is possible to make the heat exchange part consisting of the combustion chamber part and the tail pipe part very compact, and therefore the diameter of the outer shell of the immersion part is 2 /
It is possible to obtain high efficiency even at about 3 to 1/2, and also improved pressure resistance, resistance to heat shock, etc. and improved durability. For example, used as a heating source for liquid heating or metal melting. In this case, there is an effect that high efficiency, high quality, high productivity, good workability, compactness and the like can be satisfied at the same time.

According to the invention of claim 1, the one-way valve portion for disconnecting the fuel gas and the combustion air is arranged outside the furnace, and the heat exchange portion including the combustion chamber portion and the tail pass portion is arranged so as to be immersed in the furnace. Even if it is configured as described above, the pulse combustion function is not impaired, and since the heat exchange section is provided at the tip of the burner, it is possible to obtain high thermal efficiency without waste.

Further, in the invention of claim 2, the combustion chamber is present in the tip portion in the order of the fuel gas supply pipe, the combustion air supply pipe, the cooling air pipe, and the tail pipe from the central portion of the heat-resistant outer shell, and each of them is concentrically polymerized. Since the burner main body is formed by inserting and inserting the burner, it is possible to realize a compact burner in combination with the above pipe combustion method.For example, when applied to a metal melting furnace or the like, it is possible to provide a furnace with a small and large melting capacity. is there.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a pulse combustion type immersion burner according to the present invention, FIG. 2 is an enlarged sectional view taken along line XX of FIG. 1, and FIG. 3 is a sectional view of an application example thereof. FIG. 4 is a plan view, FIG. 5 is a sectional view of a conventional example, and FIG. 6 is Y of FIG.
It is an expanded sectional view in the -Y line. (V ₂ ) ... one-way valve for combustion air, (1) ... combustion chamber part, (2) ... tail pipe part, (3) ... heat resistant outer shell, (A) ... furnace, (5) ... fuel gas supply Pipe, (6) ... Combustion air supply pipe, (7) ... Cooling air pipe.

Claims (2)

[Claims] 1. In an immersion burner used in a furnace such as a liquid heating furnace or a metal melting furnace, fuel gas and air are fed to a combustion chamber for explosive combustion, and thereafter self-combustion is automatically repeated. This is a pulse combustion type burner, in which the one-way valve part for shutting off the supply of fuel gas and air is arranged outside the furnace (A), and the combustion chamber part (1) and tail pipe part (2) are cylindrical heat-resistant. A pulse combustion type immersion burner in which the heat-resistant outer body (3) is arranged by being immersed in the front end portion and the inner peripheral surface of the outer body (3), respectively. 2. A fuel gas supply pipe (5), a combustion air supply pipe (6), a cooling air pipe from the center of the heat resistant outer casing (3).
Claim 1 arranged concentrically in the order of (7) and tail pipe (2).
The pulse combustion type immersion burner described.