JPS60207812A - Multi-connection type pulse burner - Google Patents

Abstract

PURPOSE:To make it possible to stably effect the pulse oscillation of respective pulse burners by connecting tail pipes of a plurality of pulse burners to a decoupler in the order of from the pulse burners having larger combustion thermal loads to those having smaller combustion thermal loads from the upstream side to the downstream side of a combustion gas chamber. CONSTITUTION:From the upstream side to the downstream side (the side to which is connected an exhaust pipe 17) of a combustion gas chamber 18 formed inside the decoupler 16, tail pipes 15 are connected in the order of from pulse burners having larger combustion thermal loads to those having smaller loads. By this organization, combustion gases exhausted from the combustion chambers 3 of respective pulse burners 2a, 2b and 2c can be smoothly flowed from the upstream side of the combustion gas chamber 18 having a high pressure condition to the downstream side thereof having a low pressure condition. Therefore, gas streams discharged from respective tail pipes 15 within the combustion gaschambers 18 can be prevented from causing mutual interference, and suction of combustion air to respective pulse burners 2a, 2b and 2c after starting is smoothly carried out. Hence, pulse oscillation of each of pulse burners 2a, 2b and 2c can be performed stably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a multi-connected pulse combustion device in which a plurality of pulse burners are arranged inside a combustion device main body.

(Technical background of the invention and its problems) Generally, a pulse burner has nine seedlings connected to a combustion heather, and an air supply pipe and a fuel supply pipe connected to each.

At startup, air is supplied from the air supply pipe into the mixing chamber by the drive of the blower, which is driven only at startup, and fuel is supplied from the fuel supply pipe via the fuel flapper valve, and the mixture is mixed within the mixing chamber. A mixture of air and fuel is ignited by a spark plug and then exploded and burned in the combustion chamber. In this case, the air flapper valve and fuel flapper valve connected to the air supply pipe are closed by the explosion pressure in the combustion chamber, and the combustion gas in the combustion chamber is discharged from the tail pipe connected to the combustion chamber. It is designed to be exhausted to the outside via a large muffler and exhaust pipe. Also, when the pressure inside the combustion chamber decreases due to the exhaust of combustion gas, both the air and fuel flapper valves are opened, respectively, and air and fuel are supplied again, and the air and fuel are mixed in the mixing blank. The gas is ignited by the high-temperature residual gas remaining in the combustion chamber or by contact with the high-temperature combustion chamber wall surface, etc., and explosive combustion occurs again. From then on, the same operation causes explosive combustion within the combustion chamber to occur in pulses. is repeated. During startup, the blower is driven to supply combustion air from the air supply pipe to the pulse burner through the air flapper valve, and after startup, the blower is stopped and the combustion air is supplied to the pulse burner. Combustion air is drawn into the pulse burner from the air supply pipe by the negative pressure within the combustion chamber that occurs when the gas is discharged.

Incidentally, conventionally, it has been considered to connect a plurality of pulse burners having the above configuration to form a combustion apparatus main body having a large heat capacity. However, when the tail pipes of multiple pulse burners are connected to a common decoupler, the combustion gas flows discharged from each tail pipe tend to interfere with each other in the combustion gas chamber formed inside the decoupler, and the combustion gas There was a problem in that it was difficult to smooth the flow of combustion gas in the blank space. Therefore, combustion air cannot be smoothly sucked into each pulse burner after startup, and the pulse oscillation of each pulse burner becomes unstable, or the pulse oscillation of the pulse burner 6 is stopped. There was a problem.

(Object of the Invention) This invention can smooth the flow of combustion gas in the combustion gas chamber inside the decoupler to which the tail pipes of a plurality of pulse burners are connected, and stabilize the pulse oscillation of each pulse burner. The object of the present invention is to provide a multi-coupled pulse combustion device that can perform the following steps.

(Summary of the Invention) That is, the present invention provides a blower that is driven to supply combustion air into the combustion apparatus main body only at the time of startup. 1 (In addition to providing a plurality of pulse burners connected to the It, a large muffler equipped with a combustion gas chamber into which combustion gas is introduced through the tail pipe of each pulse burner is provided, and from the upstream side to the downstream side of this combustion gas chamber. The present invention is characterized in that the tail pipes are connected in order from the pulse burners having a large combustion heat load toward the combustion heat.

(Example of the invention) The drawings show one embodiment of the invention.

FIG. 1 shows a schematic configuration of the main parts of a multi-connected pulse combustion device, and 1 is the combustion device main body. A plurality of pulse burners 2a, 2b, and 2C are provided inside this combustion device main body 1. Each of these pulse burners 2a, 2b,
A mixing chamber 4 is connected to the combustion chamber 3 of 2c. Furthermore, this mixing chamber 4 has a first. Second air supply pipes 51 and 6 and fuel supply pipe 7 are connected to each other. This first
An on-off valve 8 is connected to the air supply pipe 5 . Further, the first air supply pipes 5 of each pulse burner 2a, 2b, 2c are connected to a common blow pipe 9, respectively.

A blower 10 is connected to the blower pipe 9 and is driven only at startup. Further, an air flapper valve 11 and a suction muffler 12 are connected to the second air supply pipe 6, and a fuel flapper valve 13 is connected to the fuel supply pipe 7. Furthermore, each pulse burner 2a , 2b.

The fuel supply pipes 7 of 2C are each connected to a common fuel surge tank 14. At the time of startup, the first air supply pipes 5 of each pulse burner 2a, 2b, 2c...
The on-off valve 8 connected to the .
Each pulse burner 2a, 2
Air is supplied into the mixing chambers 4 of the pulse burners 2a, 2b, 2c, and the fuel gas sent out from the fuel surge tank 14 is supplied to each of the pulse burners 2a, 2b,
2c, and the mixture of air and fuel mixed in each mixing chamber 4 is ignited by a spark plug (not shown) to the combustion chamber 3.
...It is designed to explode and burn inside. moreover,
The air flapper valves 11 and 2 of each valve bar 2a, 2b, and 2c are activated by the explosion pressure in each of these combustion chambers 3.
... and fuel flapper valves 13... are each operated to close, and the combustion gas in the combustion chambers 3... is transferred to the tail pipe 15 connected to each combustion chamber 3...
. . are discharged via a large muffler 16 and an exhaust pipe 17, which will be described later. Further, when the pressure inside the combustion chamber 3 decreases due to exhaustion of combustion gas and becomes a negative pressure state, each pulse burner 2a, 2b.

2C's air flapper valves 11... and fuel flapper valves 13... are respectively opened, and the second air supply pipes 6... and fuel supply pipes 7... are connected to the respective pulse burners 2a, 2b, 2c. Air and fuel gas are again supplied into the mixing chamber 4 of ', and the mixture of air and fuel mixed in the mixing chamber 4 is transferred to the combustion chamber 3. The high-temperature residual gas remaining in the combustion chamber 3 or the high-temperature combustion chamber 3... is ignited by contact with the inner wall surface, etc., and explosive combustion occurs again, and the same operation thereafter causes the combustion chamber 3...・The explosion and combustion inside is repeated in a pulsed manner.

Note that after starting, the drive of the blower 1o is stopped, and the on-off valve 8 connected to the first air supply pipe 5...
... is operated to close, and as the air flapper valves 11... open and close, the mixing chambers 4, . ...Air is supplied inside.

On the other hand, a combustion gas chamber 18 is formed inside the decoupler 16, and each pulse burner 2a.

Combustion gas discharged from the combustion chambers 3 . . . 2b, 2c is introduced into the combustion gas chamber 18 via the tail pipe 15 . In this case, each pulse burner 2a
, 2b, 2cQ), the combustion heat load of B)L), t<-t28 is the largest, followed by the combustion heat load of the pulse burner 2b, and the combustion heat load of the pulse burner 2c is the smallest. , and from the upstream side of the combustion gas chamber 18 (the end side opposite to the side to which the exhaust pipe 17 is connected) to the downstream side (the end side to the side to which the exhaust pipe 17 is connected). Therefore, each of the pulse burners 2a has a large combustion heat load.
The tail pipes 15 are connected in this order. Also,
Inside this combustion gas chamber 18 are a plurality of pulse burners (pulse burners 2a, 2b) partitioned by partition plates 19 and 20.

2C's tail pipe 15 (number corresponding to the number of...) muffling chambers 21
．． 22 and 23 are formed respectively. These silencing chambers 21 and 22 are communicated through an inner pipe 24 attached to the partition plate 19, and the silencing chambers 22 and 23 are communicated via an inner tube 25 attached to the partition plate 20. There is. The tail pipe 15 of the pulse burner 2a is placed in the silencing chamber 21. The tail pipe 15 of the pulse burner 2b is installed in the silencing chamber 22. The tail pipes 15 of the pulse burners 2C are connected to the muffling chambers 23, respectively. In addition, the inner pipe 25 on the downstream side in the combustion gas chamber 18
The diameter of the exhaust pipe 17 is larger than that of the inner pipe 24 on the upstream side, and the diameter of the exhaust pipe 17 is larger than that of the inner pipe 25.

Therefore, in the structure described above, each pulse burner 2a
, 2b, and 2G, the pulse burner 2a with the largest combustion heat load is connected to the silencing v21 on the upstream side of the combustion gas space 18 formed inside the deca muffler 16, followed by the pulse burner 2b with the largest combustion heat load. The pulse burner 2C, which is connected to the silencing chamber 22 at the center of the combustion gas chamber 18 and has the smallest combustion heat load, is connected to the silencing chamber 23 on the downstream side of the combustion gas chamber 18. By the way, each pulse burner 2a, 2b, 2
As shown in FIGS. 2 and 3, it has been confirmed that the greater the combustion heat load, the greater the exhaust pressure and noise, respectively. Therefore, by connecting the tail pipes 15 in order from the upstream side to the downstream side of the combustion gas chamber 18 formed inside the large muffler 16, starting with the pulse burners 2a having a large combustion heat load, the large muffler Combustion gas at the highest pressure is placed in the muffling chamber 21 on the upstream side of the combustion gas chambers 18 of No. 16, and combustion gas at the next highest pressure is placed in the muffling chamber 22 at the center of the combustion gas chambers 18.
Since the combustion gas at the lowest pressure can be introduced into the silencing chamber 23 on the downstream side of the silencing chamber 23, the combustion gas can be introduced from the upstream side of the combustion gas chamber 18 where the pressure is high to the downstream side of the combustion gas chamber 18 where the pressure is low. This allows combustion gas to flow smoothly.

Therefore, it is possible to prevent the combustion gas flows discharged from each tail pipe 15 from interfering with each other within the combustion gas seedling 18, and each pulse burner 2a, 2b after starting.

Since combustion air can be smoothly sucked into 2C, the pulse oscillation of each pulse burner 2a, 2b, l-2c becomes unstable, or the pulse oscillation of each pulse burner 2a (2c) is stopped. Or 2b.

Problems such as 2c) can be prevented. Furthermore, the combustion gas in the most noisy state is in the silencing chamber 21.
．． 22.23, the combustion gas with the next loudest noise is sent to the silencing chamber 22.23, and the combustion gas with the least noise is sent to the exhaust pipe 17 side via the silencing chamber 23. The larger the filter, the more it passes through multiple silencing chambers, so the silencing effect can be greatly enhanced.

Further, the diameter of the inner pipe 25 on the downstream side of the combustion gas outlet 18 is larger than the diameter of the inner pipe 24 on the upstream side, and the diameter of the exhaust pipe 17 is equal to the diameter of the inner pipe 25. Since the combustion gas chamber 18 is larger than the combustion gas chamber 18, the combustion gas whose flow rate gradually increases from the upstream side to the downstream side can be smoothly flowed from the upstream side to the downstream side. The flow resistance of the combustion gas within 18 can be further reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

This invention provides a combustion system in which a plurality of pulse burners connected to a blower that is driven only at startup to supply combustion air is provided in the combustion device main body, and combustion gas is introduced through the tail pipe of each pulse burner. A decoupler equipped with a gas outlet is provided, and the tail pipes are connected in order from the upstream side of the combustion gas outlet to the downstream side, starting with the pulse burners with the largest combustion heat load. The flow of combustion gas in the combustion gas space inside the decoupler to which the tail pipe is connected can be smoothed, and the pulse oscillation of each pulse burner can be performed stably.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic diagram of the main parts of a multi-connected pulse combustion device, FIG. 2 is a relationship diagram showing the relationship between combustion heat load and exhaust pressure, and FIG. FIG. 3 is a relationship diagram showing the relationship between combustion heat load and noise. DESCRIPTION OF SYMBOLS 1... Combustion device main body, 2a, 2b, 2G... Pulse burner, 5... First air supply pipe, 10... Blower, 15... Tail pipe, 16... Big muffler, 18・
...Combustion gas chamber. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (3)

[Claims] (1)? ! A combustion device main body is provided with several pulse burners, and a blower is connected to each of these pulse burners to supply combustion air through an air supply pipe, which is driven only at the time of startup, and each pulse burner of this combustion device main body is A combustion gas chamber into which combustion gas is introduced through a tail pipe of the burner is widened, and the tail pipes are connected in order from the upstream side to the downstream side of the combustion gas chamber, starting with the pulse burner having a large combustion heat load. A multi-connected pulse combustion device characterized by being equipped with a large tube. (2) The decoupler is characterized in that the inside of the combustion gas chamber is partitioned into a plurality of silencing chambers corresponding to the number of tail pipes, and each of these silencing spaces is communicated with each other via an inner pipe. A multi-connected pulse combustion device according to claim (1). (3) The decoupler is characterized in that the pipe diameter of the inner pipe that connects the respective silencing chambers increases sequentially from the upstream side to the downstream side. Connected pulse combustion device.