JPH0245620Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention involves incompletely burning industrial waste in a carbonization tower, converting it into carbonization gas with a high calorific value through thermal decomposition, and then completely burning the carbonization gas to generate heat. This paper relates to improvements to the air supply device for the combustion tube of waste heat recovery equipment that uses an exchanger to recover heat.

[Technical background of the invention and its problems]

In recent years, industrial waste has been increasing steadily, and it has become an urgent need to effectively utilize and dispose of this waste.

Industrial waste, especially waste tires, waste rubber, laminated paper waste, label printing waste, kraft paper, paper adhesive tape waste, etc., can be treated by burning the waste and using the combustion heat in a waste heat boiler. The equipment generally consists of a carbonization device for industrial waste, a combustion device for the carbonization gas, and a heat recovery device for the combustion gas (e.g., a waste heat boiler). The fourth type of carbonization gas combustion equipment in the waste incineration heat recovery equipment mentioned above is
A structure as shown in FIG. 5 is adopted.
FIG. 4 is a sectional view of a conventional combustion tube, and FIG. 5 is a view taken along the - line in FIG. 4. The combustion chamber 7 of the combustion tube 1 is surrounded by a water-cooled wall 8 on the upstream side of the combustion chamber and a fireproof and heat-insulating wall 19 on the downstream side of the combustion chamber. Reference numeral 9 denotes a gun-type heating burner that is installed through the fireproof wall, and its opening is inclined toward the downstream side of the combustion chamber. Reference numeral 2 denotes a combustion air supply pipe, which is inserted from the outside through the water-cooled wall, and has its tip located at the center of the combustion chamber and an opening facing downstream. Reference numeral 10 denotes a water-cooled pipe provided surrounding the combustion air supply pipe 2 in the combustion chamber portion.
Reference numeral 11 denotes a wind box provided in an annular shape within the water-cooled wall at the opening position of the tip of the combustion air supply pipe. Reference numeral 12 designates a large number of arc-shaped nozzles that are provided in the same rotation direction from the wind box toward the opening of the combustion air supply pipe. Reference numeral 13 denotes a combustion blower, which communicates with the combustion air supply pipe and the wind box. With the above configuration, first,
The combustion tube is heated with a heating burner, and at the same time as the carbonization gas is introduced, a combustion blower is operated to supply air to completely burn the carbonization gas.

Conventional air supply devices for combustion cylinders are constructed as described above, and are complex in structure and expensive to manufacture.Also, there are limits to the adjustment of air volume, and the scope of adaptation to different types of waste is narrow. There is a problem in that when a nozzle burns out, replacement and repair work is difficult and takes a long time.

[Purpose of invention]

The present invention was developed in view of the above-mentioned matters, and its purpose is to provide an air supply device for combustion tubes that is inexpensive to manufacture, has a wide range of applications depending on the type of waste, and is easy to replace and repair. Our goal is to provide the following.

[Summary of the idea]

In order to achieve the above object, the present invention provides a combustion air supply pipe in a combustion tube 1 for burning carbonized gas obtained from waste, whose tip is located at the center of the combustion tube and opens downstream in the flow direction of the carbonized gas. A wind box made of a bottomed cylindrical member having a diameter larger than that of the supply pipe is installed at the tip of the supply pipe, and the bottom of the wind box is connected via a connecting means so that the bottom is located on the downstream side in the flow direction of the carbonized gas. The wind box is removably provided, and the bottom of the wind box is provided with a large number of holes for air dispersion, and a large number of nozzle members having a smaller diameter than the wind box are arranged around the wind box in the same rotation direction. do.

[Example of idea]

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. Fig. 1 is a block diagram of a waste incineration heat recovery facility, and reference numeral 14 in the drawing indicates that the aforementioned industrial waste is incompletely combusted in the lower part, and the waste is thermally decomposed with the combustion heat, resulting in combustible This is a carbonization tower that recovers volatile volatile matter. Reference numeral 1 denotes a combustion cylinder provided on the downstream side of the carbonization tower to completely burn the carbonization gas by supplying insufficient air to obtain high-temperature combustion gas.
15 is a waste heat boiler as a heat exchanger for recovering heat retained in high-temperature combustion gas, 16 is an axial flow cyclone, 17 is an induction fan, and 18 is a chimney.

Figure 2 is a sectional view of the combustion tube in the present invention;
The figure is a view taken along the - arrow in FIG. Reference numeral 7 in the drawing is the combustion chamber of the combustion tube, and the water cooling wall 8 on the upstream side
It is surrounded by a fireproof heat insulating wall 19 on the downstream side and formed into a cylindrical shape. The purpose of using a fireproof and insulating wall on the downstream side of the combustion chamber is to prevent the combustion flame from cooling and to ensure complete combustion. A combustion air supply pipe 2 is inserted from the outside of the combustion cylinder through the water-cooled wall, and its tip is located at the center of the combustion chamber and opens toward the downstream side in the flow direction A of the carbonized gas. Reference numeral 3 denotes a wind box made of a bottomed cylindrical member provided at the tip of the combustion air supply pipe, and the bottom portion S is disposed on the downstream side in the flow direction of the carbonized gas. This wind box 3 has a larger diameter than the combustion air supply pipe 2, and in this embodiment, it is set to have approximately the same outer diameter as a water cooling wall 10, which will be described later. Reference numeral 4 denotes a large number of air dispersion holes provided in the bottom S of the wind box with required dimensions. Reference numeral 5 denotes arc-shaped nozzles, which are provided in large numbers on the peripheral wall of the wind box in the same rotating direction.
The diameter of the nozzle is smaller than that of the wind box 3, and the opening is located approximately at the center of the wind box and the water cooling wall, opening in the same direction as the bottom of the wind box. The wind box is removably attached to the combustion air supply pipe 2 by a suitable connecting means, ie, a flange structure 6 or a screw structure. 10 is a water-cooled wall surrounding the combustion supply pipe located in the combustion chamber;
It is installed in communication with the water cooling wall. Reference numeral 13 denotes a combustion blower, which is provided in communication with the combustion air supply pipe via a damper. Reference numeral 9 denotes a combustion tube heating burner, which is provided so as to penetrate through the fireproof wall and be inclined so that its tip opens toward the downstream side of the flow of the carbonized gas.

Next, the operation of the above configuration will be explained. first,
A predetermined amount of material to be incinerated is introduced from the top of the carbonization tower.
Also, a predetermined amount of water is supplied to the water cooling wall of the carbonization tower and the heat distribution boiler. Next, preheating operation is started, the induction fan is operated, and the combustion tube and waste heat boiler are pre-purged for a set period of time, and then the heating burner installed in the combustion tube is ignited to preheat the combustion tube. The combustion temperature is approx.
When the temperature reaches 700℃, carbonization operation begins. During carbonization operation, a combustion blower is operated with the induction fan and heating burner in operation to supply air for carbonization gas combustion to the combustion tube, and a dust removal blower (not shown) is operated to extract air from the axial flow cyclone. After starting, the waste is ignited from the ignition port at the bottom of the carbonization tower (not shown). Next, a carbonization blower (not shown) is operated to blow out air from the carbonization nozzle to start combustion in the carbonization tower hearth. The waste is heated to a high temperature by the combustion heat, causing thermal decomposition and generating flammable volatile matter. When this carbonized gas enters the combustion tube, it mixes with secondary air from the combustion blower,
It undergoes complete combustion and becomes high-temperature combustion gas that reaches the waste heat boiler. The exhaust gas, which is cooled by heat exchange in the waste heat boiler, is removed by an axial cyclone and discharged out of the system through the chimney. The combustion temperature of the combustion tube is approximately
When the temperature reaches 900℃, the heating burner is stopped and the process returns to a steady state. Even after the carbonization of waste is completed and the charcoal combustion blower (not shown) is operated, the temperature of the combustion tube remains low.
When the temperature drops below 200℃, carbonization operation ends and waste charcoal combustion operation begins. That is, the charcoal combustion blower and carbonization blower are operated at the same time to start charcoal combustion. When charcoal combustion is completed, the remaining ash is scraped out from the ash outlet. The above operations are repeated, for example, once a day to treat industrial waste. At this time,
The opening area of the bottom hole 4 of the wind box and the opening area of the nozzle member 5 are configured at an appropriate ratio, and the carbonized gas and air are mixed well due to the air swirling effect of the nozzle, resulting in complete combustion at a low air ratio. .

Furthermore, since the wind box 3 has a large diameter, flame holding on the downstream side of the wind box is good, and furthermore, due to the above-mentioned air swirling effect, carbonization gas can be combusted in a short time and stably. can.

[Effect of idea]

Since the present invention is configured as described above, it has the following effects.

(1) The wind box that supplies air to the center of the combustion chamber and the nozzle that supplies air to the peripheral wall of the combustion chamber are integrated, making it more compact than the conventional structure in which the wind box is installed inside the water-cooled wall. can be manufactured at low cost.

(2) It is now possible to connect the combustion air supply pipe and the wind box in a removable manner using a connecting means such as a flange or screw structure. It is very easy to replace and change when it is necessary to change the opening area or opening area ratio between the bottom hole of the wind box and the nozzle hole, such as changing the amount of air supplied due to fluctuations in the composition of the carbonized gas. This makes it possible to significantly reduce equipment downtime.

(3) By making the wind box installed at the tip of the air supply pipe larger in diameter than the air supply pipe, flame stability on the downstream side of the wind box is improved, and together with the air swirling effect from the nozzle mentioned above, carbonization is achieved. Gas can be burned in a short time and stably.

(4) Since the carbonized gas can be combusted in a short time, the length of the combustion tube can be made compact, making it possible to downsize and save space as a whole.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of waste incineration heat recovery equipment, Figure 2
The figure is a cross-sectional view of the lower part of the carbonization tower in the present invention, FIG. 3 is a view taken in the direction of the − arrow in FIG. 2, FIG. 4 is a cross-sectional view of a conventional combustion tube, and FIG. be. 1... Combustion tube, 2... Combustion air supply pipe, 3...
... Wind box, 4 ... Hole, 5 ... Arc-shaped nozzle, 6 ... Flange structure (connection means) 7 ...
Combustion chamber, 8...Water cooling wall, 9...Heating burner, 10
...Water cooling pipe, 11...Wind box, 12...
... Nozzle, 13 ... Combustion blower, 14 ... Carbonization tower, 15 ... Waste heat boiler, 16 ... Axial flow cyclone, 17 ... Induction fan, 18 ... Chimney, 1
9... Fireproof insulation wall.

Claims (1)

[Scope of claim for utility model registration] (1) Combustion tube 1 for burning carbonized gas obtained from waste
, a combustion air supply pipe 2 whose tip is located at the center of the combustion tube 1 and opens downstream in the carbonization gas flow direction A;
A wind box 3 made of a bottomed cylindrical member having a diameter larger than that of the supply pipe 2 is installed at the tip of the supply pipe 2, and a connecting means 6 is connected so that the bottom S of the wind box 3 is located on the downstream side in the carbonization gas flow direction A. A large number of air dispersion holes 4 are bored in the bottom S of the wind box, and a large number of nozzle members 5 having a smaller diameter than the wind box 3 are arranged around the wind box in the same rotation direction. An air supply device for a combustion cylinder in a waste incineration heat recovery facility, characterized by: (2) The combustion tube in the waste incineration heat recovery equipment according to claim 1 of the registered utility model, characterized in that the opening of the arc-shaped nozzle 5 is provided in the same direction as the bottom S of the wind box. Air supply device.