JPH06281131A - Incinerator with rotary heat storage burner - Google Patents

Abstract

(57) [Abstract] [Purpose] Heat can be effectively recovered, the mixture of the fluid to be incinerated and the air for combustion is high, and auxiliary equipment such as heat exchangers and boilers is not required, and space is also saved. To provide an incinerator equipped with a rotary heat storage burner which is advantageous in cost. [Constitution] The ratio of the length (L) of the rotary heat storage burner (20) in the flame injection direction to the length (D) in the direction orthogonal thereto is 1 ≦.
A limited space with L / D ≦ 3 is formed as a combustion chamber (10), a rotary heat storage burner (20) is provided on a furnace wall (10a) of the combustion chamber (10), and a heat storage body (22) is provided. An incinerator in which the combustion air and the fluid to be incinerated are preheated by the heat of the exhaust gas via the heat storage body (22) while relatively rotating the duct part (23) and the duct part (23).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a rotary heat storage burner adapted to use the heat of exhaust gas for preheating combustion air after incinerating a fluid to be incinerated such as gas or waste liquid in a furnace. Regarding incinerator.

[0002]

2. Description of the Related Art Incinerators for incinerating a fluid to be incinerated such as air having an offensive odor or waste liquid containing organic substances and the like to produce an exhaust gas having no offensive odor have been conventionally known. This incinerator completely burns the fluid to be incinerated and produces harmless and odorless CO ₂ , H
_Since it is changed to ₂ O or N ₂ , the following conditions are said to be necessary.

A) There is sufficient oxygen in the furnace. b) The temperature inside the furnace is as high as 700 to 1200 ° C. c) The oxygen and the fluid to be incinerated are thoroughly mixed. Under this condition, although it is relatively easy to deal with the conditions of a) and b) of oxygen supplementation and keeping of high temperature, the mixing property of oxygen and the fluid to be incinerated is not perfect and the improvement is not achieved. Is requested.

Further, in this incinerator, since the temperature inside the furnace is as high as 700 to 1200 ° C., it is a problem in terms of thermal efficiency and environmentally to release the combustion gas as it is to the outside. . Therefore, conventionally, the incinerator is equipped with a boiler and a heat exchanger as auxiliary equipment,
The heat of the exhaust gas is used for steaming and warming water, preheating waste liquid, etc. by this boiler and heat exchanger.

For example, there is a deodorization furnace shown in FIG. 9 which is a kind of conventional incinerator. In this deodorizing furnace, a burner 101 is attached to a side wall 100a of a combustion chamber 100, and a fuel guide tube 102 is attached to the burner 101.
And a conduit 103 for a fluid to be incinerated that supplies the fluid to be incinerated. A vertical wall-shaped checker 104 is provided in the combustion chamber 100 downstream of the burner 101 in the flame injection direction so as to block the flow of combustion gas from the burner 101, and the flame jet emitted from the burner 101 is checked 104. By making them collide with, a return flow is created and the combustion air and the fluid to be incinerated are mixed. Further, this deodorizing furnace is provided with a boiler 105 so as to communicate with the combustion chamber 100, guides high-temperature exhaust gas (indicated by a white arrow in the figure) from the combustion chamber 100 to the boiler 105 to heat water, It is vaporized, taken out to the outside, and used for various purposes.

Reference numeral "B" in the drawing is a blower and "P".
Is a pump, “M” is a motor, “106” is a water tank,
“107” is a steam exhaust pipe, “108” is a chimney, and “10”
9 "is a flow control valve.

An example of a deodorizing furnace provided with a heat exchanger is shown in FIG. 10 (the same members as those shown in FIG. 9 are designated by the same reference numerals). This deodorizing furnace is provided with a heat exchanger 110 so as to communicate with the combustion chamber 100,
A fluid to be incinerated is caused to flow through the heat exchanger 110 and is used as a preheater for the fluid to be incinerated.

[0008]

However, regarding the mixing property of oxygen and the fluid to be incinerated, the checker 1 is installed in the combustion chamber 100.
Even if No. 04 is provided, the flow resistance is increased, a sufficient mixing effect is not obtained, and it is difficult to completely burn and detoxify organic substances and odorous substances. Further, the deodorizing furnace shown in FIG. 9 is provided with a boiler as auxiliary equipment, but when this deodorizing furnace with a boiler is operated, water vapor is always generated. For this reason, there is a practical problem that it is not possible to operate only the device utilizing steam or the incinerator alone, and it is not possible to use each device individually. Figure 1
The deodorizing furnace shown in 0 is provided with a heat exchanger as an auxiliary facility, but this deodorizing furnace has a problem in terms of thermal efficiency. The deodorization furnace equipped with a boiler has a relatively high thermal efficiency of 80 to 85%, whereas the deodorization furnace equipped with a heat exchanger has a thermal efficiency of about 60%, which is not energy-saving and practical. Has become scarce.

The present invention has been made in order to solve the problems associated with the above-mentioned prior art, and enables effective heat recovery, and the fluid to be incinerated and the combustion air are sufficiently mixed,
It is an object of the present invention to provide an incinerator equipped with a rotary heat storage burner that does not require auxiliary equipment such as a heat exchanger and a boiler and is advantageous in terms of space and cost.

[0010]

According to the present invention for achieving the above object, an air duct through which combustion air circulates and an exhaust gas duct through which exhaust gas circulates are formed in a heat storage material made of a heat resistant material and having air permeability. A burner main body is provided so as to connect the formed duct portion and the heat storage body and the duct portion, and the exhaust gas generated by incinerating and disposing of the fluid to be incinerated by the flame from the burner body is transferred to the heat storage body. A rotary heat storage burner configured to preheat combustion air by the heat storage body while relatively rotating the heat storage body and the duct portion through the rotary heat storage burner. The burner is installed in the combustion chamber as a restricted space where the ratio of the length L of the rotary heat storage burner in the flame injection direction to the length D in the direction orthogonal to the flame injection direction is 1 ≦ L / D ≦ 3. It is incinerator with a rotary regenerative burner which is characterized in.

According to a second aspect of the present invention, a pair of the rotary heat storage burners are provided in a combustion chamber so as to face each other, and 1/2 of a distance between the rotary heat storage burners facing each other is set to L _1. When the length of the rotary heat storage burner in the direction orthogonal to the flame injection direction is D, the size of the combustion chamber is L.
It is characterized in that the ratio of ₁ to D is set to 1 ≦ L ₁ / D ≦ 3.

[0012]

In the incinerator according to the present invention, the flame blown from the burner body of the rotary heat storage burner into the combustion chamber incinerates the incinerated fluid such as the air having an offensive odor or the waste liquid containing organic substances and the like. can do.

For example, when the fluid to be incinerated is air having an offensive odor, the fluid to be incinerated and the combustion air are caused to flow through the air duct, so that the fluid to be incinerated and the combustion air are generated by the exhaust gas. It is preheated by the high temperature heat storage body immediately after being heated. Further, when the fluid to be incinerated does not contain air such as waste liquid, since the fluid to be incinerated is directly introduced into the combustion chamber and burned, in this case, only the combustion air is preheated by the heat storage body. In any case, the heat of the exhaust gas is used for preheating the combustion air or the like via the heat storage body, and the heat can be effectively recovered, without using auxiliary equipment such as a heat exchanger or a boiler. , The heat exchange efficiency is extremely high, and it saves energy. In addition, no additional equipment such as heat exchangers and boilers for heat recovery is required, and the incinerator itself can be operated independently, increasing the versatility of the incinerator, which is advantageous in terms of space and cost as an incinerator. Become.

Further, this incinerator is equipped with a rotary heat storage burner having the same outlet for the combustion air and the return outlet for the exhaust gas.
Since it is provided in the combustion chamber having a predetermined size, the combustion air and the fuel or the fluid to be incinerated discharged from the rotary heat storage burner, after being burned, are inverted in the furnace and are again guided to the heat storage body. It becomes a turn flow. Therefore, in the furnace, there is a flow structure in which the U-turned high temperature combustion exhaust gas and the newly supplied fuel are entrained and mixed, the mixing property of both is improved, and the incinerated fluid is completely combusted. .

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic vertical sectional view showing an incinerator according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and a schematic vertical sectional view of a rotary heat storage burner portion, FIG. FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, FIG. 4 is an explanatory view showing a flow state of the constrained jet, and FIG. 5 is an explanatory view showing positions of a backflow start point, an intermediate point and an end point of the constrained jet.

The incinerator according to the present embodiment completely burns a gas body containing air having an offensive odor as a fluid to be incinerated, such as air discharged from a painting facility of an automobile production plant, and is harmless and odorless. Of CO ₂ , H ₂ O or N ₂ . This incinerator, as shown in Figure 1,
For example, it has a bottomed cylindrical combustion chamber 10 made of a refractory material such as refractory bricks, and a wall 10a forming the combustion chamber 10.
A rotary heat storage burner 20 is provided in the. The rotary heat storage burner 20 is in communication with a fuel guide tube F, an air tube A for supplying a fluid to be incinerated together with combustion air, and an exhaust gas tube E for discharging exhaust gas to the outside. Here, "11" is a forced blower, "12" is an induced blower,
“13” is a flow control valve, and “14” is a painting facility.

As shown in FIG. 2, the rotary heat storage burner 20 has a burner main body 21 for injecting a flame, a heat storage body 22 mounted on the side wall 10a of the combustion chamber 10 and functioning as a heat exchange member, and a duct portion 23. Etc.

The heat storage body 22 is made of a heat-resistant material and has air permeability, and is made of, for example, ceramics having a large number of honeycomb-shaped holes, and the side wall 10a of the combustion chamber 10.
It is installed in the opening 10b opened in.

A duct portion 23 is provided on the side opposite to the combustion chamber of the heat storage body 22 so as to communicate with the heat storage body 22. The duct portion 23 is composed of an exhaust gas duct 24E formed inside a duct plate 24 attached to the side wall 10a of the combustion chamber 10, and an air duct 25A extending through the duct plate 24 to the outside. As shown in FIG. 3, the air duct 25A has a fan-shaped cross section and the exhaust gas duct 24E has an obtuse-angle fan shape. The exhaust gas flowing through the exhaust gas duct 24E has a large cross-section so that the exhaust gas flowing therethrough can efficiently heat the heat storage body 22.

The air pipe A communicates with the inlet 26 of the air duct 25A, and the exhaust gas pipe E communicates with the outlet 27 of the exhaust gas duct 24E. The air duct 25A is rotatably supported by supporting members S having a seal member and a bearing, and is rotated by the drive unit 30. The support members S, S are
Since the air duct 25A is supported in a well-balanced manner, it can be rotated relatively quickly to improve the thermal efficiency.

The drive unit 30 includes a sprocket 31 fixed around the air duct 25A between the support members S and S.
And a drive gear 33 connected to the sprocket 31 via a chain 32, and a drive motor M for driving the drive gear 33.

At the center of the air duct 25A, the burner body 2 is extended to penetrate to the center of the heat storage body 22.
1 is provided. The burner body 21 is a normal gas or oil burner, the tip of which is the combustion chamber 10.
Facing inside.

Particularly, in this embodiment, the combustion chamber 10 itself is
The ratio of the length L of the rotary heat storage burner 20 in the flame injection direction to the length D in the direction orthogonal to the flame injection direction (inner diameter D in this embodiment) is 1.0 ≦ L / D ≦ 3.0. The constraint space is such that

Generally, in the restricted space, the jet stream jetted from the nozzle forms a circulating stream with the air (secondary fluid) around the jet stream before reaching the duct wall. That is, as shown in FIG. 4, some parallel streamlines form a closed loop, that is, a circulating flow. The secondary fluid of this circulating flow is entrained on the upstream side of the starting point (N) of the circulating flow and ends at the end point P.
Has returned to the start point N on the upstream side.

The conditions under which such a circulating flow occurs can be predicted by the Thring-Newby parameter θ defined by the following equation. Here, m _a and m _o are the flow rates of the ambient flow and the jet flow, d _{o is} the diameter of the nozzle, D is the inner diameter of the furnace, ρ _o and ρ _a are the fluid densities of the ambient flow and the jet flow.

When the conditions under which this circulating flow was generated were examined in incinerators of various sizes, the results shown in FIG. 5 were obtained. In FIG. 5, the vertical axis represents the Thring-Newby parameter θ, and the horizontal axis represents the dimensionless length L / D of the furnace. As is clear from FIG. 5, the end point P of the circulating flow
Is always L / D regardless of the Thring-Newby parameter θ.
= 3.0. Here, the jet divergence angle from the nozzle was experimentally set to 9.7 degrees, and the portion where the jet flow collided with the furnace wall was obtained. As a result, for example, L / D ≦ 3.
When it is set to 0, this circulation flow can generate a circulation action of the combustion gas, that is, a reverse flow. Therefore, the rotary heat storage burner 20 was attached to the incinerator, and the state of occurrence of backflow was investigated with respect to the ratio of the length L of the rotary heat storage burner 20 in the flame injection direction to the length D in the direction orthogonal thereto. , L / D = 4.0 when a rotary heat storage burner is attached to the furnace, a circulating flow occurs in the zone of L / D ≦ 3.0, and exhaust gas is discharged smoothly, but 3.0 < L
In the zone of /D=4.0, it was found that exhaust gas stagnated and exhaust gas could not be discharged. However, if the length of the furnace is too short, the flame directly collides with the furnace wall, and the damage of the furnace wall is accelerated, so it was also found that L / D> 1.0 is preferable.

Next, the operation of the embodiment will be described. The forced blower 11 and the induction blower 12 are operated, and the fuel adjusted by the flow rate control valve 13 is supplied to the rotary heat storage burner 20. Since the fluid to be incinerated in this embodiment is a gas body containing air having an offensive odor, it is guided to the air duct 25A together with the combustion air, and is injected into the combustion chamber 10 through the heat storage body 22. On the other hand, the fuel is guided to the burner body 21 through the fuel guide tube F, ignited, and injected as a flame into the combustion chamber 10. As a result, the fluid to be incinerated is burned by this flame and becomes combustion gas, which flows toward the furnace wall facing the rotary heat storage burner 20.

In this case, the incinerator has a furnace length L and an inner diameter D.
The combustion gas is L in the combustion chamber 10 because the ratio of 1.0 ≦ L / D ≦ 3.0.
At the end point P of /D=3.0, it will be smoothly inverted. As a result, the combustion gas smoothly flows in the combustion chamber 10, and the heat storage body 2 of the original rotary heat storage burner 20 is discharged.
We will be returning to 2. Therefore, the flow of the combustion gas in the furnace becomes a smooth U-turn flow without taking any measures, and when the high temperature exhaust gas after combustion makes a U-turn and returns, the newly supplied incineration fluid and As it is mixed with the combustion air, the mixing property is improved and the complete combustion is promoted.

The U-turned combustion gas is again used for the heat storage body 22.
When passing through, the heat storage body 22 itself is heated and discharged from the duct portion 23. Here, the air duct 25A is connected to the drive unit 3
Since it is rotated by 0, the fluid to be incinerated and the combustion air gradually flow into the heat storage body 22 heated by the exhaust gas after combustion while passing through the heat storage body 22. That is, the heat storage body 22 is in a state of being heated to a high temperature by the radiant heat due to combustion and the heat of the exhaust gas itself, and therefore, when the fluid to be incinerated and the combustion air pass through the heat storage body 22, the temperature is lowered. A heat exchange action is performed with the heat storage body 22 in a non-high temperature state, and the fluid to be incinerated and the combustion air are preheated to a considerably high temperature and then injected into the combustion chamber 10. As a result, the heat is effectively recovered by the heat storage body 22, and the incinerator has an extremely high heat exchange efficiency and a high energy saving effect.

FIG. 6 is a schematic vertical sectional view showing another embodiment of the present invention. The same members as those shown in FIG. 1 are designated by the same reference numerals. The incinerator according to the present embodiment is, as the fluid to be incinerated, a waste liquid discharged from a chemical product factory or the like, that is, a liquid such as water containing an organic content of about 5 to 10%,
This liquid is completely burned and converted into harmless and odorless CO ₂ , H ₂ O and the like.

In this incinerator, the rotary heat storage burner 20 has a fuel guide pipe F and an air pipe A for supplying combustion air.
And an exhaust gas pipe E for discharging exhaust gas to the outside, and an incineration fluid supply pipe W for ejecting an incineration fluid is attached to the combustion chamber 10 and has a tip in the vicinity of the tip of the rotary heat storage burner 20, that is, a rotation. It faces the combustion chamber 10 so as to face the flame injected from the formula heat storage burner 20. From the fluid to be incinerated supply pipe W, the fluid to be incinerated is atomized or dropped as water droplets toward the inside of the furnace. Here, “15” in the figure is a pump.

In the incineration in this incinerator, the fluid to be incinerated is guided directly to the combustion chamber 10 through the fluid to be incinerated supply pipe W, discharged toward the flame from the burner body 21, and burned.

First, the combustion gas generated by this combustion is
It flows toward the furnace wall facing the rotary heat storage burner 20. However, also in this incinerator, the ratio of the length L to the inner diameter D of the furnace is 1.0 ≦ L / D ≦ 3.0 as in the previous embodiment, so that the combustion gas is generated in the combustion chamber 10. Smoothly reversing at the end point P of the rotary heat storage burner 20 and returning toward the heat storage body 22 of the rotary heat storage burner 20 to form a smooth U-turn flow in the furnace, the incinerated fluid and the combustion gas are mixed together, and the mixing property is improved. Is improved and complete combustion is promoted.

The U-turned combustion gas heats the heat storage body 22 and preheats the combustion air in the same manner as in the above embodiment, and then is injected into the combustion chamber 10. As a result, the heat is effectively recovered by the heat storage body 22, and the incinerator has an extremely high heat exchange efficiency and a high energy saving effect. Even in this case, the heat exchange efficiency is extremely high and energy saving can be achieved without using auxiliary equipment such as a heat exchanger or a boiler.

FIG. 7 is a schematic vertical sectional view showing still another embodiment of the present invention. The same members as those shown in FIGS. 1 and 6 are designated by the same reference numerals. The incinerator according to the present embodiment is provided with a plurality of rotary heat storage burners 20 so as to face each other. In this case, the combustion chamber 10 has a flame injection direction of the rotary heat storage burners 20, 20 facing each other. Length 1
When L / 2 is L ₁ and the length in the direction orthogonal to the flame injection direction is D, the ratio of L ₁ / D is
1 ≦ L ₁ / D ≦ 3.

FIG. 8 shows still another embodiment of the present invention, in which the side of the heat storage body 22 is rotated, and the same members as those shown in FIG. 2 are designated by the same reference numerals. There is.

In this rotary heat storage burner 20A, the central shaft tube 21a as the burner body 21 is rotated by the drive unit 30 and the heat storage body 22 attached to the tip end of the central shaft tube 21a is rotated to generate the heat storage. A duct portion 23 is provided on the side opposite to the combustion chamber of the body 22 so as to communicate with the heat storage body 22. The duct portion 23 has an exhaust gas duct 24E and an air duct 25A formed in a duct plate 24 attached to the side wall 10a of the combustion chamber 10. The air duct A is provided at the inlet 26 of the air duct 25A.
However, at the outlet 27 of the exhaust gas duct 24E, the exhaust gas pipe E
Are communicated with each other.

Even in this case, as in the previous embodiment, during operation, the heat storage body 22, which is heated to a high temperature by the radiant heat due to combustion and the heat of the exhaust gas itself and stores the heat, is burned with the combustion air and incinerated. When the fluid passes, the combustion air or the like is preheated by the heat of the heat storage body 22 and is injected into the combustion chamber 10 to be burned with good thermal efficiency.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the claims. Although the above-described embodiments have been described with respect to the deodorizing furnace, the deodorizing furnace is not limited to this and can be used for other incinerators that dispose of various waste liquids or exhaust gas.

[0040]

As described above, according to the present invention, the following effects can be obtained. 1) The fluid to be incinerated and the combustion air are injected from the duct portion into the furnace through the heat storage body, burned together with the fuel injected from the burner main body, and become exhaust gas, and again pass through the heat storage body from the duct portion. Since it is discharged, the combustion air and the like and the exhaust gas are at the same entrance and exit, and heat can be effectively recovered by the heat storage body, resulting in energy saving.

2) The gas flow in the furnace is of the U-turn type, and the high temperature exhaust gas after combustion is mixed with the newly supplied fuel when the U-turn is made, so that the incinerated fluid and the combustion air are mixed. And the combustion efficiency is improved.

3) No additional equipment such as a heat exchanger or a boiler for heat recovery is required, the incinerator itself can be operated independently, the versatility of the incinerator is increased, and the incinerator is costly in terms of space. Also becomes advantageous.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing an example of a rotary heat storage burner.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is an explanatory diagram showing a flow state of a restricted jet flow.

FIG. 5 is an explanatory diagram showing positions of a backflow start point, an intermediate point, and an end point of a restricted jet flow.

FIG. 6 is a schematic vertical sectional view showing another embodiment of the present invention.

FIG. 7 is a schematic vertical sectional view showing still another embodiment of the present invention.

FIG. 8 is a schematic sectional view showing still another embodiment of the present invention.

FIG. 9 is a schematic sectional view showing an example of a conventional incinerator.

FIG. 10 is a schematic sectional view showing another example of a conventional incinerator.

[Explanation of symbols]

10 ... Combustion chamber, 10a ... Wall, 2
1 ... burner body, 22 ... heat storage member, 23 ... duct portion, 24E ... exhaust gas duct, 25A ... Air duct, 30 ... drive unit, L, L ₁ ... combustion chamber of the rotary regenerative burner flame injecting direction of the length, D ... The length of the combustion chamber in the direction orthogonal to the flame injection direction.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Hirose Homura, Nakara-ku, Yokohama-shi Kanagawa 2-4, Lai-cho-cho 7 Farnestechno Co., Ltd. ▲ Lai ▼ 2-4, Machi-cho 7 Furnace Techno Co., Ltd.

Claims (2)

[Claims] 1. A heat storage material made of a heat-resistant material, which is permeable to air, and a duct portion in which an air duct through which combustion air circulates and an exhaust gas duct through which exhaust gas circulates are sectioned and are connected to each other. And a burner body is provided so as to penetrate the duct part, and exhaust gas generated by incinerating the incinerated fluid by the flame from the burner body is configured to be guided to the duct part through the heat storage body. It has a rotary heat storage burner that preheats the combustion air by the heat storage body while rotating the heat storage body and the duct part relatively, and this rotary heat storage burner is used to extend the length of the rotary heat storage burner in the flame injection direction. The rotary heat storage burner is characterized in that it is mounted in a combustion chamber in which the ratio between the length L and the length D in the direction orthogonal to the flame injection direction is 1 ≦ L / D ≦ 3. Grilled Incinerator. 2. A pair of the rotary heat storage burners are provided so as to face each other in a combustion chamber, and 1/2 of the distance between the rotary heat storage burners facing each other is set to L _1, and flame injection of the rotary heat storage burner is performed. Assuming that the length in the direction orthogonal to the direction is D, the size of the combustion chamber is such that the ratio of L ₁ and D is 1 ≦ L.
_The incinerator equipped with the rotary heat storage burner according to claim 1, wherein ₁ / D ≦ 3.