JPS59231309A - Pulse combustion device - Google Patents

Abstract

PURPOSE:To sharply decrease the generation of noise, to increase heat accumulating density through compacting of a device, and to make a heat output constant and enable fetching thereof, by a method wherein a combustion chamber, an exhaust pipe and the outer peripheral wall surface of a cushion chamber are surrounded with a heat storing container, and a latent heat accumulating device, containing a latent heat material and being formed integrally with a pulse burner, is formed in the heat storing container. CONSTITUTION:A pulse burner is constituted such that an air feed pipe 6 and a fuel feed pipe 7 are integrally disposed through the medium of a valve device 4 on the inlet side (suction side) of a combustion chamber 1. Further, the combustion chamber 1, serving as the heat exchanger part of the pulse burner, an exhaust pipe 2, and the heat exchanging outer peripheral wall surface of a cushion chamber 3 are surrounded with a heat storing container 9, the central parts of both side wall plates of the heat storing container 9 are securely mounted to the outer peripheral surface of a connection part between the valve device 4 and the combustion chamber 1 and to the outer peripheral surface of a tail pipe to bring the interior of the heat storing container 9 into an enclosed state, and latent heat accumulating materials 10 and heat exchanging pipes 11 are disposed inwardly of the heat storing container 9 to constitute a latent heat accumlating device formed integrally with the pulse burner.

Description

[Detailed Description of the Invention] Industrial Fields of Use The present invention can be widely used in all fields that utilize heat, such as hot water supply, space heating, and industrial use (integrating a Luss combustor and a latent heat storage device). This is related to the burning neck.

The conventional configuration and its problem-based pulse combustor can burn under high load, has good heat transfer characteristics, and has an flJ point that allows automatic suction of combustion air and self-ignition except during startup. .

Since the structure of the combustor is simple and it can be manufactured at relatively low cost, it is expected that it will be used in many other fields.

However, pulse combustors have the problem that the excessive noise generated during combustion makes it difficult to achieve practical noise unless various noise reduction measures are taken. The disadvantage was that the food packaging was large.

OBJECTS OF THE INVENTION The present invention provides such a pulse combustor that significantly reduces noise, is compact, has a high heat storage density, and has a constant heat output that can be taken out.

Furthermore, the present invention provides a pulse combustion device that enables heat utilization at temperatures of 100° C. or higher, which cannot be achieved with water depending on the method of use. A cushion chamber and a tail pipe are sequentially connected via an exhaust pipe to the exit side of a combustion chamber having an ignition device in a pulse combustor.
(In a pulse combustor configured by connecting a fuel pipe and a combustion air supply pipe to the inlet side of the combustion chamber via a pulp device, the heat exchange outer peripheral wall surface of the combustion chamber, exhaust pipe, and cushion chamber) is surrounded by a heat storage container, a latent heat storage material is stored in the heat storage container, and is integrated with the pulse combustor to form an IF-latent heat storage device. Preferably, the heat exchange method of the latent heat storage device is a shell book-and-tube type, and the latent heat storage device is characterized in that a metal thermal conductor is housed together with the latent heat storage material.

71. Among the pulse combustion devices currently in use, there is no known one that integrates a pulse combustor and a latent heat storage device as in the present invention.

As a result of various studies on noise countermeasures for pulse combustors and effective methods of using pulse combustors, the present inventors have found that by integrating the pulse combustor and a latent heat storage device, an effective method can be achieved. It was confirmed that a pulse combustion device could be realized.

PIJ, in order to prevent excessive noise, it is necessary to control the gas in the pulse combustor and the configuration of the pulse combustor.
It is important to consider how to reduce noise from the entire equipment.

One effective way to prevent this noise is to provide a thick coating around the pulse combustor.

In this case, simply increasing the thickness of the combustor wall or covering it with a noise-absorbing material may be effective in reducing noise, but will only result in a larger size and higher costs.* In view of these points, the excellent f1.1 original pulse combustor has. As a result of considering how to make use of the existing functions while reducing noise and adding new functions, we found that it is extremely effective to integrate the pulse combustor and the latent heat storage device.

DESCRIPTION OF THE EMBODIMENTS One aspect of the embodiment of the present invention will be described. Like a conventional pulse combustor, a combustion chamber (1) is provided with 1 spark plug and 0 spark plugs.
A small diameter exhaust pipe 12 is installed on the outlet side (exhaust 1flll) of
), the cushion nayamba (3) and the tail pipe 8) are successively connected to the combustion chamber (1), and the air supply pipe (3) and the fuel supply pipe (m) to the inlet side (intake side) of the combustion chamber (1) are connected to the pulp equipment. (
4) to form a pulse combustor, and furthermore, the heat exchange outer peripheral wall surface of the combustion chamber (1), which is the heat exchange part of this pulse combustor, the exhaust vibrator ■, and the cushion chamber ■. It is surrounded by a heat storage container (2), and the central part of both II plates of this heat storage container (9) is connected to the outer peripheral surface of the connection part between the pulp device (4) and the combustion chamber (1) and the outer peripheral surface of the tail pipe. The inside of the heat storage container (9 is sealed) and the heat storage container 9 is fixed to each other.
), a latent heat storage material αO and a heat exchange pipe) are installed inside and arranged to constitute a latent heat storage device t integrated with the pulse combustor.

The pulse combustion device configured in this way operates the spark plug (5) at the time of startup, and supplies combustion air and fuel from the vibro) (7) to the combustion chamber (1) via the valve HLR (4). By doing so, combustion is forced.

Once the system is stabilized and a combustion cycle is formed, 1. And.

After that, even if the ignition plug (5) is stopped, fuel and combustion air are automatically sucked into the pulp device (through the pulp device).

Furthermore, self-ignition continues pulse combustion at a constant frequency. At this time, the heat generated from the pulse combustor is mainly transferred to the combustion chamber (
1) Heat is exchanged on the walls of the exhaust pipe (2) and the cushion chamber (2), and this combustion heat is absorbed and retained by the fC latent heat storage material arranged on the heat exchange outer wall surface (n).

Ru.

The latent heat 1゛ thermal material < 11) also has heat in the heat storage container θ
), it can be taken out and used at a substantially constant temperature level by fc# exchange exchange 74.

The latent heat storage line used in the present invention includes the temperature level and heat storage density at the time of use. It is necessary to select the optimal medium in terms of stability with repeated use, heat conduction/safety, cost, etc. Basically, it is generally not well known,
materials, i.e., n-paraffin and its derivatives,
It is possible to use portable systems such as salt hydrates and clathrate hydrates, which are used at temperatures below 150°C, and molten salt systems, which are used in low temperature ranges.

However, there are particularly important problems when applying the latent heat storage material known up to now to the present invention.

Consideration is given to thermal conductivity and heat exchangers. In the present invention, in order to maximize the advantages of the pulse combustor, such as high-load combustion and heat transfer characteristics, in the heat storage device such as the latent heat storage head and the heat exchange pipe Q (I), the thermal conductivity, It is necessary to improve heat exchange performance, and at the same time, it is necessary to make the structure simple and easy to use.

From this point of view, it is preferable to use a shell-and-tube type heat exchanger as a means of heat exchange, and fins are provided on the outside of the tubes used to improve heat exchange performance. It is preferable to improve it. Note that the capsule type heat exchanger Fi. Although this is a fairly effective method for reducing noise, it is not suitable as there are many problems with land handling.

The heat medium used in the shell-and-tube heat exchanger is selected depending on the temperature level, but water, silicone oil, glycols, etc. are preferable.

However, since the heat storage material σG generally has a very low thermal conductivity, in order to improve its thermal conductivity, a latent heat storage material C1 (J that is relatively stable and compatible) is used. It is effective to mix a good metal heat conductor and house it in the heat storage container (2) together with the heat-trapping heat storage blade QG. This means that in the conventional pulse combustor, the heat exchange performance of combustion heat is Although the thermal conductivity of the interface between the gas and its heat exchange wall was dominant, in the present invention, it was found that the influence of the low thermal conductivity of the latent heat storage material was also significant because of fC.

The heat conductor of this metal desk has two granular shapes, one linear and one plate.

It can be used in a porous or other shape, and can be stored in the heat storage container e) by dispersing or mixing it into the latent heat storage material (11) or by arranging it in a fin shape and stacking it with the latent heat storage material αO. A good method is to change the structure, and by configuring it in this way, the inherent advantages of the pulse combustor can be utilized.

Next, the performance of the pulse combustor according to an embodiment of the present invention and a conventionally widely known hot water storage type pulse combustor will be compared.

In this case, both pulse combustor parts are.

Assume that their structures are the same. The difference is that the embodiment of the present invention has a latent heat storage neck section consisting of the heat storage container (1), the head of the latent heat storage line, and the heat exchange pipe CLII, whereas the conventional example has a hot water storage tank using water. In addition.

Most of the construction of both pulse combustors is made of stainless steel, and the calorific value is unified to 30,000"Mhr. Furthermore, the contents of the heat storage container (■) of the embodiment of the present invention and the hot water storage tank of the conventional example Both products were set to 30/.

The heat storage container υ) of the present invention and the heat exchange pipe (mouth) or is made of stainless steel, and is A latent heat storage material 00.

The main component is sodium acetate trihydrate, with a double layer of sodium pyrophosphate decahydrate at 11% to prevent supercooling, and a thickener mainly composed of polyvinyl alcohol to prevent phase separation. A mixture of allocation was used.

This latent heat storage material αO is immediately put into the heat storage container [F]), and the latent heat storage material CIG is placed in this container.
The heat conduction was improved by partitioning the cells at about 1-interval intervals using mesh-like wire meshes made of stainless steel.

Furthermore, the heat exchange pipe middle 1 is arranged on the same circumference from the center of the pulse combustor in the heat storage container (■), and the latent heat storage material aO
The outer periphery of the sono pipe was brought into contact with the pipe and the stainless steel wire mesh, and the heat output was utilized by flowing water into the pipe from one side.

As a result of operating and comparing the pulse combustor of the embodiment of the present invention configured as described above and the conventional hot water storage type pulse combustor described above, it was found that the device of the embodiment of the present invention has the following advantages. there were.

1) Noise has been reduced.

Both the intake and exhaust sides were configured with the same muffler, and when comparing the S noise, in the case of the conventional device, it was 58 dB.
(A), whereas the mounting W of the embodiment of the present invention was 43 (
Category reduced to IB(A). The reason for this reduction in noise is thought to be that the transmitted sound from the heat storage device is attenuated due to the mass effect of the FC aging heat storage material provided in the heat storage container (2) and the mutual kinetic friction effect.

2) Heat is obtained continuously at a substantially constant temperature.

In the case of conventional hot water storage type devices, heat is stored using W4 heat, so
Depending on the conditions of use, the change in temperature obtained by the apparatus according to the embodiment of the present invention may be relatively large.

Even if the combustion state or load state changes, the latent heat storage method maintains a constant temperature around the melting point of the heat storage material.For example,
In the sodium acetate trihydrate system, a melting point temperature of 58° C. is continuously obtained.

3) High heat storage density and downsizing is possible.

Although it is possible to use heat at 40 to 80°C in conventional hot water storage type equipment, in the equipment rC of the embodiment of the present invention, sodium acetate trihydrate system (thermal storage density 55 Caky) is used as the latent heat storage material.
When using this system, the amount of heat stored even just by the amount equivalent to latent heat was more than 1.5 times that of the conventional system per shift. Therefore,
This high heat storage density enables miniaturization.

In this way, the pulse combustion apparatus shown in the above embodiment of the present invention not only has the effect of reducing noise, but also
It has many advantages from both sides.

In the above Example R (?II), sodium acetate trihydrate having a melting point of 58°C was used as the heat storage material, but in addition to this, many latent heat storage materials can be applied depending on the usage temperature level. For example, it has become clear that by using high-temperature materials such as molten salts, it is possible to achieve temperatures of 100°C or higher with relatively high heat storage density, which is impossible to achieve with conventional hot water storage devices. In addition to hot water supply and space heating, which are the main uses of conventional pulse combustors, it can also be used for applications that require high temperatures.
It can be used efficiently and safely.

Effects of the Invention As described above, the present invention can utilize a pulse combustor and latent heat storage 2) Heat at a constant temperature.

3) High heat storage density, allowing for miniaturization.

4) By selecting a latent heat storage material according to the purpose of use, a high temperature of 100°C or higher can be obtained.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the pulse combustion device of the present invention. (1) is the combustion chamber, ■ is the exhaust pipe, c3) is the cushion chamber, (4 is the pulp device, (5 is the spark plug, 6)
is the air supply pipe, c7) is the fuel supply pipe, ■ is the tail pipe. ■) is a heat storage container, αO is a latent heat storage material, and 5Qll is a heat exchange pipe.

Claims (1)

[Claims] (1) A cushion chamber and a tail pipe are sequentially connected to the outlet side of a combustion chamber having an ignition device via an exhaust pipe, and fuel and combustion air are supplied to the inlet side of the combustion chamber. A pulse combustor is constructed by connecting pipes via a pulp device, and a heat storage container surrounds the heat exchange outer peripheral wall surface of the combustion chamber, exhaust pipe, and cushion chamber of the pulse combustor, and a heat storage container is provided. A pulse combustion device characterized in that a latent heat storage material is housed inside to form a latent heat storage device. (2) The pulse combustion device according to claim 1, wherein heat exchange between the heat storage container and the heat transfer medium is performed in a shell-and-tube type. (3) Claim 1, characterized in that a latent heat storage material and a genus heat conductor are housed in the latent heat storage device.
Noculus combustion device according to item 1 or 2.