JPH0567843B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the inside of the proximal end of a blower tube through which combustion air is forced to flow through a gaseous fuel consisting of a large amount of preformed gas, etc. By ejecting the gaseous fuel and combustion air with equal pressure from the inner circumferential wall surface of the hollow cylindrical gaseous fuel ejection chamber with a relatively wide area, the gaseous fuel and combustion air are The mixed gas is stirred and mixed easily to form a complete mixed gas, and the mixed gas is heated by the heating action of the mixed cylinder while flowing between the inner circumferential wall surface of the mixed cylinder and the outer circumferential wall surface of the blower cylinder. The present invention relates to a gaseous fuel combustion device that can perform more effective agitation and mixing to ensure continuous good combustion at all times.

[Prior Art] Conventionally, gaseous fuel, which has been formed into a gaseous state in advance, is mixed with forced air while being circulated from a mixed cylinder to a gas chamber to form a mixed gas, and then this is mixed with gas under a constant pressure state. A gaseous fuel combustion apparatus capable of carrying out jet combustion is known as described in, for example, Japanese Utility Model Publication No. 57-52496 prior to the filing of this application, the contents of which will be explained with reference to FIG.

That is, the combustion tube 1 has a bottomed cylindrical shape with an open end.
A combustion disk 2 having a large number of air-fuel mixture gas injection holes 3 perforated on its surface is disposed over the inner periphery of the combustion chamber 1, and a gas chamber 4 is formed between the combustion tube 1 and the combustion disk 2.

In the combustion plate 2 facing the central opening 5 opened at the center of the gas chamber 4, a mixed cylinder 6 whose tip end is closed and its base end side is open is inserted between the mixed cylinder 6 and the central opening 5. The mixed cylinder 6
The interior communicates with the gas chamber 4 via the central opening 5. The inside of the tip of the blower tube 9, which is deeply inserted into the mixed cylinder 6 from the bottomed side of the combustion tube 1 through the central opening 5, is formed in a donut shape as a whole;
Moreover, it is constructed by disposing a gas ejection body 10 having a large number of gas ejection holes 11 on its circumferential surface.

[Problems to be Solved by the Invention] By the way, in conventional gas fuel combustion devices of this type, the gas ejection body for ejecting gaseous fuel into the mixed cylinder has a donut shape as a whole, and the combustion air flows through it. Since the gas ejector is placed near the opening on the tip side of the air blower tube, it is possible that the gas ejector may get in the way when blowing air into the mixed cylinder, making it impossible to accurately blow the desired amount of combustion air. However, it goes without saying that the volume of the gas ejector cannot be made large, and the number of gas ejection holes drilled on the surface of the gas ejector inevitably decreases, resulting in a reduction in the amount of gaseous fuel ejected from each gas ejection hole. The ejection speed becomes extremely high when a large volume of gas is burned, and after being vigorously ejected into the mixed cylinder, it flows along the inner peripheral surface of the mixed cylinder and is finally forced into the gas chamber. Therefore, the gaseous fuel vigorously ejected from the gas nozzle does not stir and mix with the combustion air that is blown toward the mixed cylinder within the blower cylinder, but instead enters the gas chamber while being separated from the combustion air. Since the mixture is pressurized, it does not form a perfect mixed gas, and during gas combustion, it has the problem that it is combusted in an unstable state.

The present invention is designed to ensure that the gaseous fuel is stirred and mixed with the combustion air in the blower tube through which the combustion air smoothly circulates to form a complete mixed gas. While flowing between the two, the mixture is heated by heating from the mixed cylinder to further stir and mix the mixture.
The object of the present invention is to obtain a gaseous fuel combustion device that can always perform good combustion.

[Means for Solving the Problems] In order to achieve the above object, in the gaseous fuel combustion device of the present invention, a mixed cylinder 1 whose base end side is open
A combustion plate 1 has a combustion tube 101 in which a plurality of gas mixture gases 21 and 21 are rotatably installed, and a large number of air-fuel mixture jet holes 107 are bored in the inner periphery of the combustion tube 101.
05 to form a gas chamber 110 between the combustion tube 101 and the combustion disk 105. The mixed cylinder 12
1 and the gas chamber 110 communicate with each other, and the mixed cylinder 12 communicates with the combustion cylinder 101 through the opening on the base end side.
1. Insert the blower tube 127 into the chamber. A hollow cylindrical gas fuel ejection chamber 139 in which a large number of gas fuel ejection holes 144 are bored in the inner circumferential wall surface 140 is disposed inside the base end side of the blower tube 127 to supply gaseous fuel to the mixed cylinder 121. The gaseous fuel and the combustion air are injected from the outside to the inside toward the combustion air flowing toward the gas chamber 110 while accurately stirring and mixing the gaseous fuel and the combustion air in the blower tube 127 to form a complete mixed gas. This allows for stable combustion to continue over a long period of time.

[Operation] When starting combustion, the combustion air is sent to the blower tube 12.
7, the combustion air is allowed to flow smoothly through the gaseous fuel injection chamber 139 and the blower tube 127, and then the combustion air is further passed between the inner circumferential surface of the mixed cylinder 121 and the outer circumferential surface of the blower tube 127. After flowing along the gas chamber 110, the gas is forced into the gas chamber 110, and finally it is ejected inward from the gas chamber 110.

Under such conditions, if a gaseous fuel such as a preformed gas is supplied to the gaseous fuel ejection chamber 139, the gaseous fuel will flow into a relatively large area inside the base end of the blast tube 127. A large number of gaseous fuel injection holes 144 are perforated in the inner circumferential wall surface 140 of the gaseous fuel injection chamber 139 disposed in the gaseous fuel injection hole 144 . collides with and is stirred and mixed. As a result, the gaseous fuel is released into the gaseous fuel ejection chamber 139 together with the combustion air.
While flowing through the blower cylinder 127 toward the mixed cylinder 121, the two gases are reliably stirred and mixed to become a mixed gas, which is then pressurized into the mixed cylinder 121. At the same time, the mixed gas is As it passes between the inner circumferential surface and the outer circumferential surface of the blower tube 127 while twisting and turning, it is further stirred and mixed to become a complete mixed gas, which is then pressurized into the gas chamber 110, and finally from the gas chamber 110. Fumarole combustion occurs under equal pressure conditions.
Therefore, no matter how small or large a volume of gaseous fuel is injected inward from the gaseous fuel injection chamber 139, the gaseous fuel and combustion can be easily controlled by adjusting the amount of combustion air. Accurately stir and mix the air for use in the blower tube 127,
As long as the formation of the desired mixture gas can be achieved, the mixture gas is heated by the mixture cylinder 121 after transitioning to vaporization combustion, and is heated to the inner peripheral surface of the mixture cylinder 121 and the outer periphery of the blower tube 127. The gaseous fuel can be stably combusted over a long period of time by further promoting the air-mixing effect while passing between the gaseous fuel and the surface.

[Example] Examples will be described with reference to the drawings.

In FIGS. 1 and 2, 101 has a vertical cylindrical wall 102 with a polygonal cross section and an open upper end, and a bottom wall 103 has an annular bulge in the center that bulges outward. The combustion tube is a bottomed cylindrical combustion tube provided with a protrusion 104, and on the inner periphery of the combustion tube 101,
A large number of air mixture gas ejection holes 1 are provided around the entire circumference of the vertical cylinder wall 106.
A gas chamber 110 is formed between the combustion body 101 and the combustion disk 105 by installing combustion disks 105 with holes 07 and a recessed combustion chamber 109 in the center of the bottom wall 108 at intervals. urge

The recessed combustion chamber 109 has a cylindrical wall 111 and a bottom wall 11.
2, and an opening 113 is opened in the center of the bottom wall 112. 114
is a fumarole chamber having a hollow annular shape installed around the open end of the open portion 113;
The outer circumferential wall 114a of No. 14 extends outward so that a blowing swirl guide path 115 is formed between it and the bottom wall 112, and an appropriate number of swirling nozzles 116 are opened on the surface of the outer circumferential wall 114a. , a swirling wind is generated in the recessed combustion chamber 109. The fume chamber 114 is formed by the annular bulge 104 of the combustion tube 101.
A ventilation chamber 117 and multiple air supply pipes 11 installed adjacent to the side
8..., and communicates with the fumarole chamber 1.
A cold air blow window 119 is opened in the inner cylinder wall of 14. 120 is the combustion tube 1 from the ventilation chamber 117 side.
A rotating shaft inserted toward the center of 01,
A mixed cylinder 121 whose base end side is open is directly connected to the tip of the rotating shaft 120 so as to cover the rotating shaft 120. The open end of the mixed cylinder 121 is bent outward to protrude, and a combustion scattering plate 123 integrally provided on the upper part of the mixed gas 122 having a hollow cylindrical shape is attached to the peripheral end surface of the mixed cylinder 121. They are integrally attached so that a fuel scattering gap 124 is formed between them.

125 is the upper part of the fume chamber 114 and the mixed cylinder 121
An annular cold air blow passage formed between the cold air blow passage 125 and the air mixture 122 attached to the open end of the cold air blow passage 125, and the blowing base end side of the cold air blow passage 125 is communicated with the cold air blow window 119 and the gas chamber 110, Only cold air is blown into the recessed combustion chamber 109. Therefore, the mixed cylinder 121 is communicated with the gas chamber 110 via the open part 113, and the open side of the mixed cylinder 121 is recessed into the recessed combustion chamber 109 and exits from the fuel scattering gap 124, thereby causing the fuel to scatter. The fuel sprayed by the plate 123 is sure to reach the cylindrical wall 111 of the recessed combustion chamber 109.
When it hits the surface, it becomes atomized and is quickly burned alive by the replenishment action from the cold air jet gap 125. A large number of auxiliary flame holes 126 are bored in the circumferential surface of the cylindrical wall 111 forming the recessed combustion chamber 109, so that part of the mixed gas filling the gas chamber 110 is directed toward the mixed cylinder 121 for jet combustion. The temperature inside the mixed cylinder 121 is raised to the vaporized gas generation temperature, and vaporized gas is continuously generated.

Reference numeral 127 is a blower cylinder whose bottom side is attached to the end of the communication port 128 which opens at the center of the annular bulge 104, and whose upper end opening faces the vicinity of the top of the mixed cylinder 121, and which is inserted and erected. , 129 is a hollow fuel diffuser integrally attached to the inner surface of the top of the mixed cylinder 121, and a fuel scattering gap of an appropriate size is provided between the inner surface of the mixed cylinder 121 and the upper end surface of the fuel diffuser 129. is provided. 130 is a fuel supply pipe for feeding fuel to the lower inner surface of the fuel diffuser 129. This fuel supply pipe 130 supplies liquid fuel to the fuel diffuser 129 when there is no gaseous fuel, or when it is desired to burn liquid fuel instead of gaseous fuel, to cause the state to shift from a raw combustion state to a vaporized combustion state. 131 is the inside of the combustion disk 105 and the ventilation chamber 11
7 through the gas chamber 119, the lower end side is attached to the bottom wall 103 of the combustion tube 101, and the upper end side is attached to the bottom wall 108 of the combustion disk 105. Then, the feed cylinder 1
When the combustion tube 101 has a rectangular shape as shown in FIG. Cylinder 131...
A fume diffusion guide plate 132 made of a single sheet and having an arcuate inner side is disposed at a position above the opening at intervals. Then, around the fume diffusion guide plate 132 provided to cover the upper opening of the supply cylinder 131..., cooling air is blown from the ventilation chamber 117 through the feed cylinder 131 so as to hit the fume diffusion guide plate 132. A blowing hole 133 is opened to blow out the combustion air along the bottom wall 106 of the combustion disk 105 to the surrounding area. Reference numeral 134 denotes a plurality of blowholes for secondary combustion air that penetrate through the joint between the mounting flange 135 provided on the front end side of the combustion body 101 and the mounting flange 136 provided on the front end side of the combustion disk 105.

Reference numeral 137 denotes a flame stabilizing ring that is attached to the inner periphery of the combustion disk 105 so that its free end side is bent inward. 138 is a drain pipe.

Reference numeral 139 denotes a gaseous fuel injection chamber disposed inside the base end side of the blower tube 127, and the gaseous fuel injection chamber 139 has an inner circumferential wall 140 and an outer circumferential wall 141 sealed on both the distal end side and the proximal end side. They are integrally attached to form a hollow cylindrical chamber, and a ventilation inlet 142 is formed inside the base end of the gaseous fuel injection chamber 139, and a ventilation outlet 143 is formed inside the tip. A large number of gaseous fuel jetting holes 144 are provided on the inner wall 140 of the gaseous fuel jetting chamber 139.
... and the gaseous fuel injection chamber 139.
A plurality of gaseous fuel supply pipes 145 are open-connected to the base end side of the gaseous fuel supply pipe 145, and the gaseous fuel supplied into the gaseous fuel injection chamber 139 from the gaseous fuel supply pipe 145 enters the ventilation inlet 142 from the ventilation chamber 117, and then, Gaseous fuel ejection chamber 139 exits from ventilation outlet 143
The combustion air is vigorously ejected toward the combustion air flowing inside the combustion chamber to promote agitation and mixing of the gaseous fuel and combustion air to form a complete mixture of gases.

[Effects of the Invention] Since the present invention is configured as described above, it produces effects as described below.

The volume of the gaseous fuel ejection chamber 139 is made larger than that of conventional gaseous fuel combustion devices, so that the gaseous fuel supplied into the gaseous fuel ejection chamber 139 is constantly circulated with combustion air in an equal pressure state. is ejected from the outside so as to surround the gaseous fuel and the combustion air to reliably promote agitation and mixing of the gaseous fuel and the combustion air, and further agitation and mixing in the gas chamber 110 due to the heating action from the mixture cylinder 121 to form a complete mixture of gases. This may be due to the fact that the mixed gas can be vigorously jetted from the gas chamber 110 for stable combustion, and a predetermined amount of combustion air is always supplied to the mixed cylinder 121 without blocking the passage of the blower cylinder 127. Air can be blown towards the target.

[Brief explanation of the drawing]

The drawings show an embodiment of the gaseous fuel combustion apparatus according to the present invention, in which FIG. 1 is a partially cutaway longitudinal sectional front view, FIG. 2 is a plan view of the same, and FIG.
It is a longitudinal sectional front view with a conventional part notched. 101... Combustion tube, 105... Combustion plate, 107
...Mixed gas outlet, 110...Gas chamber, 121
... Mixed cylinder, 127 ... Blow tube, 139 ... Gaseous fuel injection chamber, 140 ... Inner peripheral wall surface, 144 ... Gaseous fuel injection hole.

Claims (1)

[Claims] 1 A combustion plate with a large number of mixed gas injection holes is arranged on the inner periphery of a combustion cylinder in which a mixed cylinder with an open base end is rotatably installed, and a gas chamber is created between the combustion cylinder and the combustion plate. The mixed cylinder and the gas chamber communicate with each other, and a blower tube is inserted into the mixer cylinder through an opening on the base end side from the combustion tube side, and the blower tube has a base end side inside. A gaseous fuel combustion device characterized in that a hollow cylindrical gaseous fuel ejection chamber having a plurality of gaseous fuel ejection holes bored in an inner circumferential wall surface is disposed.