JPH029270Y2 - - Google Patents

Description

[Detailed description of the invention] The invention involves thermally decomposing petroleum composite waste such as scrap tires in a furnace in the first stage to generate cracked gas.
Regarding a pilot light device for a combustion device suitable for use in a waste treatment device having a structure in which the cracked gas is completely combusted outside the furnace in the second stage, in particular, a pilot light device for a combustion device that allows the state of the pilot flame to be confirmed from the outside. The main purpose is to make suggestions.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing an example of a waste treatment device. 1 is a cracked gas generating furnace, 2 is waste (tires) stacked inside the furnace, 3 is a cracked gas outlet,
Reference numeral 4 indicates a combustion tube attached to the outlet 3, and 5 indicates a heat exchanger that converts, for example, water into water temperature using the heat completely combusted in the combustion tube 4. When the furnace 1 burns in the furnace, the temperature becomes high and the life of the fireproof wall is shortened, so the air flow rate of the blower 6 is adjusted to prevent the temperature from rising above the temperature at which, for example, synthetic rubber can be thermally decomposed. . When the waste in the furnace reaches the thermal decomposition temperature, it generates a large amount of decomposition gas. Incidentally, a safety valve 7 is provided at the upper part of the furnace 1 to adjust the pressure inside the furnace. The cracked gas is supplied from the outlet 3 to the combustion tube 4 .

The combustion tube 4 is composed of an outer tube 11, an inner tube 12, etc., and complete combustion is performed at the free end of the outer tube and inner tube 11, 12.
The combustion gas exchanges heat with the heat exchanger 5.
Specifically, as shown in FIG. 2, a first outer cylinder 11a is fixed to the outlet 3, and a second outer cylinder 11 forming a primary combustion chamber is removably connected to the first outer cylinder 11a.
b. It is composed of a first inner cylinder 12a that controls the amount of decomposed gas flowing to the second outer cylinder 11b, and a second inner cylinder 12b that forms a residual decomposed gas heating chamber. On the outlet 3 side of the first inner cylinder 12a that is fitted into the first outer cylinder 11a, a flow rate control plate 13 in which a certain hole 13a is bored in order to keep the amount of gas flowing into the primary combustion chamber constant is integrated. established in The amount of cracked gas flowing out varies depending on the combustion state of the furnace 1, and if a large amount is generated, the outer cylinder 11
It is necessary to keep the flow velocity constant within the primary combustion chamber because the flow velocity within the primary combustion chamber increases and there is a risk of extinguishing the pilot flame, which will be described later. First inner cylinder 12
The reason why a is configured to be removable is because carbon components adhere to the vicinity of the outlet 3, so it is necessary to periodically clean it. 14 is a handle for removal.

On the side of the primary combustion chamber constituted by the second outer cylinder 11b, there is provided a pilot spark plug 16, a pilot fire device comprising a raw gas for pilot fire, such as a propane gas supply port 17, and an air supply port 18. 15 are provided. In order to always make it possible to ignite the pilot flame even when the necessary cracked gas does not flow into the furnace 1, gas is supplied from the gas pipe 19 and introduced into the supply port 17, as shown in FIG. It is mixed with air in the mixing chamber 20 and the secondary mixing chamber 21. The air supply opening 18 is also led into a primary mixing chamber 20 . Primary mixing chamber 2
A partition wall 23 is provided between 0 and the secondary mixing chamber 21, and the partition wall 23 has small mixed gas outlet holes 23a.
is drilled. The diameter of the hole 23a is determined by taking into account the gas pressure in the primary combustion chamber and the mixed gas pressure. The size is such that the flame that was burning in 21 does not flow back into the primary mixing chamber 20. This is because if the flame flows back into the primary mixing chamber 20, the pilot gas and air will not mix sufficiently, resulting in an incompletely mixed state, which may cause a misfire. 24 indicates a pilot flame confirmation peephole, and this position is located in the secondary mixing chamber 2.
In order to see the combustion state at No. 1, the position is made to coincide with the position of the hole 23a of the partition wall 23. In order to prevent the mixed gas in the primary mixing chamber from leaking from the peephole 24 as much as possible, the free end of the air supply port 18 is formed to widen at the end, and the air is guided so as to come into contact with the inner wall of the primary mixing chamber, thereby creating a pressure difference. This prevents leakage to the outside. In FIG. 1, 25 is a pilot gas supply cylinder, 26 is a conduit thereof, 27 is an air supply blower, and 28 is a conduit.

In FIG. 2, the pilot device 15 and the second outer cylinder 11
An air supply port 31 for supplying primary combustion air is fixed to the second outer cylinder 11b between the connecting end of the second outer cylinder 11b, and
Air outflow hole 31a that corresponds to the outflow direction of cracked gas
Multiple holes have been drilled. 32 indicates a blend gas supply port. In the primary combustion chamber, combustion occurs by mixing the cracked gas and air from the air supply port 31, and the second
It functions to raise the temperature of the cracked gas flowing through the inner cylinder 12b to facilitate secondary combustion in the next stage. Therefore, when the required temperature is not reached, the blended gas supply port 3
It is necessary to feed raw gas from 2 to maintain a constant combustion state.

Secondary combustion takes place at the free ends of the outer and inner cylinders 11 and 12. The secondary combustion is mainly performed using the cracked gas fed into the inner cylinder 12 and the air flowing out from the secondary combustion air supply port 33 provided on the free end side of the second outer cylinder 11b. Heat from secondary combustion is transferred to heat exchanger 6
As mentioned above, the water is supplied to Inner cylinder 1
Since the cracked gas in the inner cylinder 12 is considerably heated by the heat in the primary combustion, incomplete combustion will not occur even if a large amount of cracked gas is supplied from the inner cylinder 12 during the secondary combustion. Of course, the air supply from the supply port 33 can be controlled as necessary. A flame shield plate 34 is provided in the second inner cylinder 12b. This is because if secondary combustion is performed using a large amount of decomposed gas and air, the flame will be long and reach a considerably high temperature, which will shorten the life of the heat exchanger 5. The size and shape are appropriately selected depending on the flame condition. In FIG. 1, 36 is a pipe between the air supply port 31 and the blower 27, 37 is a pipe between the air supply port 33 and the blower 27, and 38 is a pipe between the blend gas supply port 32 and the cylinder 2.
5.

As described above, according to the present invention, there are provided a primary mixing chamber and a secondary mixing chamber to which the pilot raw gas is separately supplied from the supply port, an air supply port is provided in the primary mixing chamber, and the primary mixing chamber and the secondary mixing chamber are provided with an air supply port. A bulkhead for preliminary mixed gas outflow is provided between the secondary mixing chamber and an ignition plug is installed in the secondary mixing chamber to ignite the mixed gas, and a pilot flame confirmation peep that matches the hole in the bulkhead for preliminary mixed gas outflow is provided. A hole was provided in the wall of the primary mixing chamber, and the free end of the air supply port was formed to widen toward the end, so that the air supplied into the primary mixing chamber came into contact with the inner wall of the primary mixing chamber. The gas is premixed in the primary mixing chamber and differentially mixed in the secondary mixing chamber, so it can be easily ignited with a plug, and the primary mixing chamber, which is separated from the secondary mixing chamber in the combustion state, can be easily ignited. Since the primary mixing chamber is located in a high-pressure nourishing body from the outside, the mixed gas will not leak to the outside, and when air is supplied, a leak-preventing membrane is formed by the air flow. This has the effect of further preventing external leakage.

Further, the partition wall can prevent the pressure in the mixing chamber from increasing during ignition of the pilot flame and flowing back into the primary mixing chamber, and maintain a sufficient mixed state of gas and air in the primary mixing chamber. Therefore, the mixed gas for the pilot flame can be stably supplied into the secondary mixing chamber, and the pilot flame can be ignited in the secondary mixing chamber easily and reliably.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing an example of a waste treatment device, Fig. 2 is a sectional view showing an example of a combustion tube, and Fig. 3 is a sectional view showing an example of a combustion tube.
The figure is a sectional view showing an example of a pilot fire device. 4... Combustion cylinder, 11... Outer cylinder, 12... Inner cylinder,
16... Spark plug for pilot flame, 17... Raw gas supply port, 18... Air supply port, 20... Primary mixing chamber,
21... Secondary mixing chamber, 23... Partition wall, 23a...
Hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A primary mixing chamber and a secondary mixing chamber are provided to which the pilot raw gas is separately supplied from the supply port, an air supply port is provided in the primary mixing chamber, and the primary mixing chamber and the secondary mixing chamber are provided. A bulkhead for premixed gas to flow out is installed between the chamber and a spark plug is installed in the secondary mixing chamber to ignite the mixed gas, and a pilot flame confirmation peephole is installed that matches the hole in the bulkhead for preliminary mixed gas to flow out. A type of combustion device characterized in that the air supply port is provided on the wall surface of the primary mixing chamber, and the free end of the air supply port is formed to widen toward the end, so that the air supplied into the primary mixing chamber comes into contact with the inner wall of the primary mixing chamber. Fire device.