JP2001355822A - Heat storage combustion type gas treating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat storage combustion type gas treating furnace, high in a gas treating efficiency and compact. SOLUTION: The heat storage combustion type gas treating furnace is provided with a plurality of heat storage combustion type burners 3, faced to a combustion chamber 1 and equipped with a heat storage body 2 to preheat treated gas through the heat storage body 2 of some heat storage type burner 2 and supply the same into the combustion chamber 1 to decompose by heat and recover the heat of the treated gas after the thermal decomposition through the heat storage body 2 of the other heat storage combustion type burner 3, then, the treated gas is exhausted to effect the preheating and the heat recovery sequentially through the heat storage body 2. In such a gas treating furnace, the gas flow passage 22 of the heat storage combustion type burner 3 is provided with a swirler 23 to swirl the treated gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative combustion type gas processing furnace for processing gas containing an odorous component, and more particularly to a burner for a regenerative combustion type gas processing furnace.

[0002]

2. Description of the Related Art A regenerative combustion type gas processing furnace is provided with a plurality of regenerative combustion burners provided with a heat storage body facing a combustion chamber, and includes a gas to be treated (for example, odor gas, combustion exhaust gas, Exhaust gas containing dioxin) is preheated through a regenerator of a regenerative combustion burner and supplied to a combustion chamber to be thermally decomposed, and the gas to be treated after the pyrolysis is passed through a regenerator of another regenerative combustion burner. The gas is recovered and exhausted to preheat gas and heat recovery by the heat storage body.

In a conventional regenerative combustion type gas processing furnace,
After the gas to be treated is introduced into the burner through a heat storage body provided in the gas flow path of the heat storage combustion type burner, it is supplied to the combustion chamber as it is.

Here, in a regenerative combustion type gas processing furnace,
In order to increase the gas treatment efficiency, a method of increasing the residence time of the gas to be treated in the combustion chamber can be cited, but it is necessary to increase the volume of the combustion chamber.

[0005]

However, an increase in the volume of the combustion chamber inevitably leads to an increase in the size of the gas processing furnace. Installation was not possible.

An object of the present invention, which has been made in view of the above circumstances, is to provide a compact regenerative combustion type gas processing furnace having high gas processing efficiency.

[0007]

In order to achieve the above object, a regenerative combustion type gas processing furnace according to the present invention faces a combustion chamber,
A plurality of regenerative combustion burners provided with regenerators are provided, and the gas to be treated is preheated through a regenerator of a regenerative combustion burner and supplied to a combustion chamber to be thermally decomposed. In a regenerative combustion type gas processing furnace which recovers heat through a regenerator of a regenerative combustion burner and sequentially exhausts gas by preheating and recovering heat by the regenerator, a gas to be treated is supplied to a gas passage of the regenerative combustion burner. Is provided with a swirler for turning.

According to the above configuration, by supplying the swirled gas to be processed to the combustion chamber, the gas processing efficiency of the gas to be processed in the combustion chamber can be improved.

A fuel injection nozzle for injecting fuel into the gas to be processed swirled by the swirler may be provided facing the gas flow path.

Further, a swirler may be formed by the heat storage body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

The inventor of the present invention has provided a heat storage combustion type burner.
We focused on the fluid behavior of the gas to be processed (or the processing gas exhausted from the combustion chamber) supplied to the combustion chamber, and in particular, the fact that recirculation flow occurs in the combustion chamber when it is supplied into the furnace in a swirled state. .

FIG. 1 is an explanatory view showing an embodiment of a regenerative combustion type gas processing furnace according to the present invention, and FIG. 2 is a schematic sectional view of a regenerative combustion type burner in FIG.

As shown in FIG. 1, a regenerative combustion type gas processing furnace according to the present invention faces a combustion chamber 1 and has a plurality of (six in FIG. 1) regenerative combustion burners provided with a regenerator 2. 1, a gas supply line 5, a purge line 6, and an exhaust line 7 are connected to each burner 3 via switching means (three-way valve in FIG. 1) 4. An exhaust line (blower) 8 is connected to the exhaust line 7.

As shown in FIG. 2, the regenerative combustion type burner 3 has a bent (elbow-shaped) gas flow path 22 formed therein, and has one open end (a lower open end in FIG. 2). ) 22a is connected to the switching means 4 shown in FIG. 1 and the other open end (left open end in FIG.
Is provided facing the inside of the wall body 21 forming. The heat storage body 2 is provided on the upstream side in the gas flow path 22 in the flow direction of the gas to be treated, and the swirler 23 is provided on the downstream side. Further, a throttle means 24 is provided at the open end 22b of the gas flow path 22. Further, the burner 3 is provided with a fuel nozzle 25 for spraying fuel, and in FIG.
A fuel nozzle 25 is attached to a fuel nozzle insertion hole 26 formed through the casing 3a and facing the gas flow path 22.

Here, the arrangement of each regenerative combustion type burner 3 provided facing the combustion chamber 1 is such that three opposing burners 3 are completely opposed in FIG. 1, but the arrangement is particularly limited. Instead, for example, one of the facing burners 3 may be offset in the horizontal direction (the horizontal direction in FIG. 1) or the vertical direction (the direction perpendicular to the drawing in FIG. 1).

The heat storage element 2 is not particularly limited, but may be, for example, a ceramic honeycomb type,
A saddle type and the like can be mentioned.

The swirler 23 is not particularly limited, and may be a swirler generally used to generate a swirling flow or a vortex. For example, FIG.
As shown in FIG. 3, a slit 35 for generating a swirling flow on the surface of the cylindrical body 34 having one end opened and the other end closed.
May be formed, and the swirler 33 may be provided at the bent portion K of the gas flow path 22. Further, a spiral flow path (not shown) may be formed inside the heat storage body 2 and the heat storage body 2 itself may be used as a swirler. The mounting position of the swirler 23 is not particularly limited.
If it is attached to a portion having a large cross-sectional area of No. 2, it can be said that narrowing described later can be obtained also in the gas flow path 22, which is more preferable.

The mounting position of the fuel nozzle 25 is not particularly limited to the fuel nozzle insertion hole 26 of the burner 3, and the fuel nozzle 25 is mounted in a state where the tip of the fuel nozzle 25 is located near the opening end 22b of the gas flow path. It may be directly attached to the wall 21.

Further, in FIG. 2, the gas passage 22 of the burner 3 is bent, but the burner structure and the shape of the gas passage are not particularly limited, and as shown in FIG. It is needless to say that the burner 43 having the gas flow path 42 may be used.

Instead of providing the throttle means 24 at the open end 22b of the gas flow path 22, the flow path itself on the open end 22b side of the gas flow path 22 may be formed thin.

Next, an example of a gas processing method when the heat storage combustion type gas processing furnace having the above configuration is applied to an odor gas deodorizing apparatus will be described with reference to FIGS.

In the regenerative combustion type gas processing furnace shown in FIG. 1, the burners 3 of A and B are in the combustion mode, the burner 3 of C is in the purge mode, and the burners 3 of D, E and F are in the exhaust mode. . That is, the valve of the gas supply line 5 to be treated is
Only the valves of the A and B burners 3 are opened, and the gas to be treated (for example, odorous gas from a dust hopper or the like) is supplied to the A and B burners 3. Further, the valve of the purge line 6 opens only the valve of the C burner 3 to supply the purge gas to the C burner 3. Further, the valves of the exhaust line 7 open only the valves of the burners 3 of D, E and F, and exhaust the processing gas through the burners 3 of D, E and F.

The gas to be treated introduced into the gas passages 22 of the burners 3 of A and B through the opening end 22a is heated by passing through the preheated heat storage body 2. Next, the gas to be processed is swirled by passing through the swirler 23, and a swirling flow S of the gas to be processed is generated. The swirling flow S is sprayed with fuel through the fuel nozzle 25 and ignited. The swirling flow S of the gas to be processed is gradually pyrolyzed (oxidized) while swirling, and is blown into the combustion chamber 1 through the throttle means 24. Here, the swirl flow S of the gas to be treated
Is narrowed down by passing through the throttle means 24, the flow velocity becomes faster and the turning strength becomes stronger.

Further, the burner 3 of C is opened through the open end 22a.
The purge gas introduced into the gas passage 22 purges untreated gas remaining in the gas passage 22 into the combustion chamber 1.

The swirling flow S of the gas to be treated blown into the combustion chamber 1 reacts with air (oxygen) in the combustion chamber 1 while rapidly expanding (spreading) the volume, and the heat of the gas to be treated is increased. Decomposition proceeds. At this time, the volume of the swirling flow S of the gas to be processed rapidly expands, and the pressure inside the swirling flow S decreases. Therefore, the swirling flow S is entrained toward the center of the swirl, and as a result, the entrained flow M results. Further, the unprocessed gas purged into the combustion chamber 1 together with the purge gas is also thermally decomposed together with the swirling flow S of the gas to be blown into the combustion chamber 1.

The gas to be treated (process gas) after the thermal decomposition is
Air is exhausted through burners 3 of D, E, and F. Open end 22
The processing gas introduced into the gas flow paths 22 of the D, E, and F burners 3 through the b is swirled by passing through the swirler 23, and a swirling flow (not shown) of the processing gas is generated. I do. When the swirling flow of the processing gas passes through the heat storage unit 2, the exhaust heat of the processing gas is stored and recovered in the heat storage unit 2. The processing gas after exhaust heat recovery is exhausted (discharged to the atmosphere) through the switching means 4, the exhaust line 7, and the exhaust fan 8. here,
A part of the exhausted processing gas may be returned to the purge line 6 as a purge gas.

At this time, since the processing gas passing through the heat storage body 2 is swirled, a slight loss occurs in the flow of the processing gas, and the pressure loss of the processing gas before and after passing through the heat storage body 2 slightly increases. However, there is almost no loss in the recovery efficiency of heat recovery. The exhaust heat of the processing gas is D,
Since the heat is stored in the heat storage body 2 of the burners 3 of E and F, the temperature of the processing gas exhausted from the exhaust line 7 decreases to about 100 ° C. If a large heat storage body 2 is used, the heat storage effect is further improved. Due to the increase, the temperature of the exhausted processing gas further decreases (eg, to about 50 ° C.). here,
Since the difference between the introduction temperature of the gas to be treated and the exhaust temperature of the gas to be treated is the temperature rise due to the fuel, that is, the amount of fuel used in the burner 3 is only the amount to raise the temperature of the gas to be treated by about 50 to 100 ° C. The lower the temperature of the exhausted processing gas, the lower the fuel cost in the gas processing cost of the regenerative combustion type gas processing furnace can be.

Next, after burning for a certain period of time (for example, about 30 seconds to several minutes) in such a state, each line 5
The heat storage combustion type gas processing furnace is operated while the mode of each burner 3 is sequentially switched by switching the valves 6 and 7 and the switching means 4 instantaneously. An example of a valve sequence during operation of the regenerative combustion type gas processing furnace is shown below.

The gas processing is performed by setting the burners 3 of A and B to the combustion mode, the burner 3 of C to the purge mode, and the burners 3 of D, E and F to the exhaust mode.

Gas processing is performed by setting the burners 3 of A and F to a combustion mode, the burner 3 of B to a purge mode, and the burners 3 of C, D and E to an exhaust mode.

Gas processing is performed by setting the burners 3 of E and F to the combustion mode, the burner 3 of A to the purge mode, and the burners 3 of B, C and D to the exhaust mode.

Gas processing is performed by setting the burners 3 of D and E to the combustion mode, the burners 3 of F to the purge mode, and the burners 3 of A, B and C to the exhaust mode.

Gas processing is performed by setting the burners 3 of C and D to a combustion mode, the burners 3 of E to a purge mode, and the burners 3 of A, B and F to an exhaust mode.

Gas processing is performed by setting the burners 3 of B and C to the combustion mode, the burner 3 of D to the purge mode, and the burners 3 of A, E and F to the exhaust mode.

As described above, →→→→→→
→ Each line 5, according to the valve sequence
The valves 6 and 7 are controlled to operate the heat storage combustion type gas processing furnace. The specific gas processing method of the heat storage combustion type gas processing furnace in each case is the same as the above-described method. Further, in this embodiment, a case has been described in which two burners are assigned to the combustion mode, one burner is assigned to the purge mode, and three burners are assigned to the exhaust mode. However, the present invention is not limited to this. Needless to say, two burners may be assigned to each mode.

In the regenerative combustion type gas processing furnace according to the present invention, the gas to be treated is blown into the combustion chamber 1 while being swirled and compressed, so that the entrainment flow M is generated in the combustion chamber 1. The gas to be treated blown into the combustion chamber 1 from the open end 22b of the gas flow path 22 by the entrained flow M
As shown in FIG. 2, once diffused, the open ends 22 are again diffused.
It converges toward b. For this reason, it is possible to prevent a phenomenon that the gas to be processed is blown out, that is, the gas to be processed blown into the combustion chamber 1 is immediately exhausted from the burners in the exhaust mode (the burners 3 of E and F in FIG. 1). As a result, the residence time of the gas to be treated in the combustion chamber 1 increases.

In addition, since the entrained flow M entrains the flame in the combustion chamber 1 generated by the combustion into the central portion of the swirling flow S, the entire gas to be treated is uniformly exposed to a high temperature. As a result, the gas processing efficiency of the gas to be processed in the combustion chamber 1 (deodorization efficiency in the case of odorous gas) is promoted.

Therefore, by the generation of the entrainment flow M,
The residence time of the gas to be treated can be increased without increasing the volume of the combustion chamber 1, and a dead space hardly occurs in the combustion chamber 1, so that the combustion chamber 1 can be effectively used as a combustion space. For this reason, in the regenerative combustion type gas processing furnace according to the present invention, in order to obtain gas processing efficiency equivalent to that of the conventional regenerative combustion type gas processing furnace, the size (volume) of the combustion chamber 1 is required
About half is sufficient. Therefore, the construction cost of the regenerative combustion type gas processing furnace can be significantly reduced, and the construction of the regenerative combustion type gas processing furnace with high gas processing efficiency can be performed even in a place where there is not much room on the site. .

Further, when flue gas from an incinerator is used as the gas to be treated in the regenerative combustion type gas treatment furnace, dioxin contained in the flue gas can be decomposed, so that the present invention relates to the present invention. By disposing the heat storage combustion type gas treatment furnace between the incinerator and the chimney, it can be used as a dioxin decomposition (removal) device. As described above, in the present embodiment, the case where the regenerative combustion type gas processing furnace is applied to the odor gas deodorizing apparatus has been described, but the regenerative combustion type gas processing furnace according to the present invention is
It goes without saying that the present invention is not limited to application to a deodorizing device.

[0041]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) The gas to be treated is blown into the combustion chamber while being swirled and compressed, whereby the gas treatment efficiency in the combustion chamber can be increased.

(2) As a result of (1), if the same gas processing efficiency is obtained, the size (volume) of the combustion chamber of the regenerative combustion type gas processing furnace according to the present invention is the same as that of the conventional regenerative combustion type gas processing furnace. It is much smaller than the furnace combustion chamber.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a heat storage combustion type gas processing furnace according to the method of the present invention.

FIG. 2 is a schematic sectional view of the regenerative combustion burner in FIG.

FIG. 3 is a schematic sectional view showing a modified example of the swirler of the heat storage combustion type burner in FIG. 1;

FIG. 4 is a schematic cross-sectional view showing a modification of the gas flow path of the regenerative combustion burner in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 combustion chamber 2 regenerator 3 regenerative combustion burner 22 gas flow path 23 swirler 25 fuel injection nozzle

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 53/70 B01D 53/34 134E F23G 5/46 ZAB F-term (Reference) 3K065 AA24 AB01 AC19 BA04 JA01 JA11 JA23 3K078 AA04 CA08 CA17 CA22 EA02 4D002 AA21 AA40 AB02 AC04 BA05 BA12 CA11 CA13 CA20 DA56 HA01 HA08 HA09

Claims (3)

[Claims] 1. A plurality of regenerative combustion type burners each having a regenerator are provided facing a combustion chamber, and a gas to be treated is preheated through a regenerator of a regenerative combustion burner and supplied to the combustion chamber to be thermally decomposed. In the regenerative combustion gas processing furnace, the gas to be treated after the thermal decomposition is recovered and exhausted through the regenerator of another regenerative combustion burner and exhausted to sequentially perform preheating and heat recovery of the gas by the regenerator. A regenerative combustion type gas processing furnace, characterized in that a swirler for swirling a gas to be processed is provided in a gas flow path of the type burner. 2. The regenerative combustion type gas processing furnace according to claim 1, wherein a fuel injection nozzle for injecting fuel into the gas to be processed swirled by the swirler is provided facing the gas flow path. 3. The heat storage combustion type gas processing furnace according to claim 1, wherein a swirler is formed by the heat storage body.