JP2630971B2 - Pulse combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention forms a fuel supply passage and a combustion air supply passage at one end of a combustion chamber and a combustion exhaust gas discharge passage at the other end. The present invention relates to a pulse combustion device configured to connect a dale pipe to make a fluid fuel and combustion air flow into the combustion chamber by the dynamic inertia of the combustion exhaust gas accompanying the explosion, and to perform explosive combustion.

[Conventional technology]

Conventionally, as shown in FIG. 3, a check valve (23) that allows only gas flow to the combustion chamber (1) side is provided in each of the fuel supply path (21) and the combustion air supply path (22). The check valve (23) is opened and closed according to the pressure fluctuation of the combustion chamber (1), so that the fuel gas and the combustion air flow into the combustion chamber (1) only when the pressure in the combustion chamber (1) is negative. Had to be configured.

Further, the fan (24) of the combustion air supply path (22) is driven only at the time of ignition and is stopped in the steady combustion state.

[Problems to be solved by the invention]

However, in the check valve (23), the plate-like valve body (23a) violently vibrates about 50 to 100 times per second, which easily causes a problem in the durability of the valve body (23a). The noise caused by the vibration of 23a) tends to increase, and there are two check valves (23) with a large number of parts and a complicated structure, which poses problems in terms of cost, production and maintenance. There was room for further improvement.

An object of the present invention is to provide a fluid fuel and a combustion air supply unit,
The problem is that there is almost no trouble and noise, and the cost, production, and maintenance are improved to be advantageous, and further, high-load combustion is possible, and the noise reduction configuration can be reduced in size.

[Means for solving the problem]

A characteristic configuration of the present invention is that an air chamber is connected to a combustion air supply path, and an air supply device that pressurizes and supplies combustion air even in a steady combustion state is provided in the air chamber. While being formed in the open passage, the flow resistance to the gas flow from the air chamber to the combustion chamber is formed in a shape that is smaller than the flow resistance to the gas flow in the opposite direction,
An opening is provided to pressurize and supply fluid fuel from the fuel supply passage formed in the normally open passage to the combustion air supply passage, and its operation and effect are as follows.

(Operation)

In other words, both the fuel supply passage and the combustion air supply passage are formed as always open passages without providing the conventionally required check valve. The configuration is such that the mixed gas of the combustion air is supplied to the combustion chamber in a state suitable for pulse combustion.

More specifically, in the steady combustion state, when the internal pressure of the combustion chamber rises due to combustion, the combustion exhaust gas of the combustion chamber flows to the tail pipe, and also flows to the combustion air supply path by the cushion function of the air chamber, and after combustion. When the internal pressure of the combustion chamber decreases, gas flows from both the tail pipe and the combustion air supply path to the combustion chamber.However, both the fluid fuel and the combustion air are pressurized and supplied from the combustion air supply path side. Because the gas tends to flow to the tail pipe side, and because the flow resistance to the gas flow from the combustion air supply path to the combustion chamber is smaller than the flow resistance to the reverse gas flow, As a whole, most of the flue gas flows into the tail pipe, and the gas flow from the combustion air supply path to the combustion chamber at a time is opposite to the gas flow at a time. It is greater than, a mixed gas of combustion air and fluid fuel combustion chamber, is the supply amount is supplied in a state of periodic variation.

Therefore, while the good pulse combustion can be stably continued as in the past, the failure, noise, cost,
Problems such as troublesome production and maintenance can be completely eliminated.

In addition, as confirmed by experiments, the frequency of the pressure fluctuation in the combustion chamber can be set to 150 to 250 times / sec, which is much higher than the above-described conventional technology of 50 to 100 times / sec, and the load of the combustion chamber can be reduced as described above. It was 3-5 × 10 ⁷ Kcal / hm ³ which was sufficiently larger than the conventional 2-3 × 10 ⁷ kcal / hm ³ . If the frequency can be increased in such a manner, the silencer can be made small in size because the combustion noise becomes high frequency.

〔The invention's effect〕

As a result, there is almost no trouble or noise in the fuel supply unit, and it can be advantageous in all aspects of cost, production, and maintenance.In addition, high-load combustion and miniaturization of the silencing configuration are possible, and combustion performance is improved. Thus, it has become possible to provide an extremely high-quality pulse combustion device that can improve durability, prevent noise, reduce costs, and reduce the size.

〔Example〕

 Next, an embodiment is shown in FIG. 1 and FIG.

A combustion air supply path (2) is connected to one end of the combustion chamber (1), an air chamber (3) is connected to the combustion air path (2), and combustion air is steadily burned in the air chamber (3). An air supply device (12) is also provided for supplying pressure at a substantially constant pressure even in the state.

An air chamber (3) for forming the combustion air supply passage (2)
A substantially straight pipe section (2a) connected to the pipe, and a convergent section (2b) connected to the pipe section (2a) on the small diameter side and connected to the combustion chamber (1) on the large diameter side. A disk-shaped wall (4) opposed to the pipe portion (2a) is arranged at the center of the large-diameter side of the flared portion (2b) and attached with a support rod (4a);
A gas discharge port (5) is formed on the outer peripheral side of the wall (4) over substantially the entire circumference, so that a combustion air supply path (2) is formed.
It is formed in a normally open passage without a check valve, and is formed in such a shape that the flow resistance to the gas flow from the air chamber (3) to the combustion chamber (1) is smaller than the flow resistance to the gas flow in the opposite direction. is there.

The fuel gas distribution chamber (6) is located behind the divergent portion (2a).
The fuel supply path (7) having a flow control valve (V) is connected to the distribution chamber (6), and the fuel gas is supplied from the distribution chamber (6). A large number of small circular openings (8) for supplying pressure are dispersedly connected to the flared portion (2b), and the fuel gas and the combustion air are mixed at the flared portion (2b). It is configured to supply gas from the gas discharge port (5) to the combustion chamber (1).

The air chamber (3) is connected to a pressure release passage (9) for suppressing an increase in the internal pressure, and a tail pipe (10) forming a discharge passage for combustion exhaust gas is provided at the other end of the combustion chamber (1). connection,
A starting spark plug (11) is attached to the combustion chamber (1), thereby constituting a pulse combustion device.

The operation of the pulse combustion device will be described. At start-up, the air supply device (12) is operated to supply the fuel gas and the combustion air at an appropriate mixing ratio to the combustion chamber (1), and explode in the combustion chamber (1) by the ignition plug (11). Cause.
As a result, due to the dynamic inertia of the combustion exhaust gas accompanying the explosion, an appropriate amount of fuel gas and combustion air are sent from the two supply passages (2) and (7) into the combustion chamber (1), and then into the combustion chamber (7). The remaining flame ignites, explodes again, and the operation repeats. The operation of the ignition plug (11) is stopped when the pulse combustion is stabilized.

The fuel gas pressure in the fuel supply passage (7) is 200 to 300 mmH ₂ O.
In and by the input to 10000Kcal / hr to pulse combustion becomes more -500~-1000mmH ₂ O pressure fluctuation width from 1000~1500mmH ₂ O of the combustion chamber (1), in which case, the air chamber (3)
The supply pressure of the air supply device (12) and the pressure loss of the pressure release passage (9) are set in accordance with the pressure loss of the combustion air supply passage (2) so that the average pressure of the air becomes about 300 to 500 mmH ₂ O. .

(Another embodiment)

 Next, another embodiment will be described.

The volume, shape, and other conditions of the air chamber (3) are appropriately selected according to the characteristics of pulse combustion, the pressure loss and the natural frequency of the combustion air supply passage (2), and the like.

The specific configuration of the air supply device (12) can be changed, for example, such as an electric blower or a compressor, and may be combined with a governor for maintaining a constant pressure.

The combustion air supply path (2) and the fuel supply path (7) can be appropriately changed in shape, dimensions, specific structure, and the like.

The opening (8) for pressurizing and supplying the fuel gas has dimensions, numbers,
The arrangement and the like can be appropriately changed. For example, the connection may be made only to the pipe portion (2a), or may be connected to both the pipe portion (2a) and the flared portion (2b).

The wall (4) can be appropriately changed in shape, size, structure, mounting configuration, and the like.

The pressure release path (9) is effective in reducing the size of the air chamber (3), and can be appropriately changed in shape, dimensions, arrangement, number, structure, and the like, but can be omitted.

As the fuel, gas fuel such as city gas, natural gas, propane gas or the like is mainly used, but liquid fuel such as oil can also be used.

The pulse combustion device includes, for example, a combustion chamber (1) or a tail pipe (10) in a fluid such as a flash drying device or a liquid heating device.
It can be used for various heating purposes, such as heating a fluid by positioning it, etc., or for the purpose of utilizing exhaust energy and heat as in a hot air generator, and the specific configuration can be changed as appropriate.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention, and FIG. 2 is a view taken along the line II-II of FIG. FIG. 3 is a schematic sectional view of a conventional example. (1) ... combustion chamber, (2) ... combustion air supply path,
(3) ... air chamber, (4) ... wall, (5) ... gas discharge port, (7) ... fuel supply path, (8) ... opening, (9)
…… Pressure release path, (10)… Tail pipe, (12) …… Air supply device.

Claims (3)

(57) [Claims] 1. A tail pipe forming a fuel supply passage (7) and a combustion air supply passage (2) at one end of a combustion chamber (1) and a discharge passage of combustion exhaust gas at the other end. Ten)
A pulse combustion device configured to cause fluid fuel and combustion air to flow into the combustion chamber (1) by dynamic inertia of flue gas accompanying the explosion and to perform explosive combustion, wherein the combustion air supply passage is provided. An air chamber (3) is connected to (2), and an air supply device (12) is provided in the air chamber (3) for pressurizing and supplying combustion air even in a steady combustion state. 2) is formed as an always open passage, and is formed in a shape such that the flow resistance to the gas flow from the air chamber (3) to the combustion chamber (1) is smaller than the flow resistance to the gas flow in the opposite direction. A pulse combustion apparatus having an opening (8) for pressurizing and supplying fluid fuel from the fuel supply path (7) formed as a normally open passage to the combustion air supply path (2). 2. The method according to claim 1, wherein the combustion air supply passage is formed in a substantially straight pipe section connected to the air chamber, and on a small diameter side of the pipe section. And a flared portion (2b) connected to the combustion chamber (1) on the large diameter side, and
A wall (4) is provided at a central portion of the enlarged portion (2b) on the large diameter side so as to face the pipe portion (2a),
A gas discharge port (5) is formed on the outer peripheral side of the wall (4),
2. The pulse combustion device according to claim 1, wherein the plurality of openings for pressurized supply of the fluid fuel are dispersedly connected to the flared portion. 3. A pulse combustion apparatus according to claim 1, wherein a pressure relief passage (9) for suppressing an increase in the internal pressure is connected to said air chamber (3).