JP2002048326A - Incineration treatment apparatus for combustible spent gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an incineration treatment apparatus in which consumption of fuel gas and treatment amount of the combustible spent gas are suppressed, the treatment time is shortened, and the running cost is reduced. SOLUTION: The incineration treatment apparatus is equipped with a combustion chamber (1a), a burner (2) which burns in the chamber (1a) a combustion gas (G1) and a combustible spent gas (G2), and a catalyst vessel (21) provided downstream of the chamber (1a) A cooling means (12) is provided in the chamber (1a) for suppressing the rise of combustion temperature of the gas (G2). When the gas (G2) is self-extinguishing gas, the temperature of the inside of the chamber (1a) is kept at a base temperature (T1), and the objective gas (G2) is subjected to an incineration treatment in the tank (21). When the gas (G2) can continue a self-sustained combustion, the cooling means (12) is operated, and the inside of the chamber (1a) is kept at a catalyst maintenance temperature (T2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustible gas (hereinafter referred to as a "combustible exhaust gas") which leads to environmental pollution, such as a gas which becomes unnecessary after various treatments such as a sterilization treatment, an odor gas generated during the treatment or the like. The present invention relates to a flammable exhaust gas incineration apparatus for incinerating odorless and harmless gas by incineration.

[0002]

2. Description of the Related Art A conventional incineration apparatus for combustible exhaust gas is, for example, an apparatus shown by reference numeral (40) in FIG. 2 (hereinafter referred to as "conventional example 1") or an apparatus shown in FIG.
The one shown by (50) (hereinafter referred to as "conventional example 2") is known. Here, FIG. 2 is a schematic diagram showing a direct combustion type incineration apparatus (40) and a sterilization apparatus (30) according to Conventional Example 1 in association with each other, and FIG. 3 is a catalytic incineration apparatus (50) according to Conventional Example 2. FIG. 2 is a schematic diagram [omitted of the sterilization apparatus (30)].

The sterilization apparatus (30) seals an object to be sterilized (for example, a pre-shipment product such as a medical scalpel, a disposable syringe, a paper diaper or a sanitary product) in a sterilization chamber (31), and After evacuating the chamber (31), sterilizing gas [G ₁ : for example, flammable ethylene oxide (C ₂ H ₄ O)]
Mixed with carbon dioxide (CO ₂ ), which is an inert gas, for a certain period of time and sterilized. Then, the used sterilized gas is used as a combustible exhaust gas (G ₂ ) as necessary. After being mixed with air or the like and diluted, the mixture is introduced into the direct combustion type incineration apparatus (40). Reference numeral (32) in FIG. 2 denotes a door that seals the sterilization chamber (31) so that it can be opened and closed, (33) is a blower, (34) is a connection port for both vacuum evacuation and introduction of outside air, and (35) is a drain. Each mouth is shown.

[0004] The combustible exhaust gas (G ₂ ) that has become unnecessary by the sterilization treatment in the sterilization treatment device (30) is taken out by a batch method. That is, when the sterilization process is completed, the combustible exhaust gas (G ₂ ) is repeatedly taken out a plurality of times while the object to be sterilized is left in the sterilization chamber (31). This is to dilute the combustible exhaust gas (G ₂ ) remaining on the object to be sterilized until it becomes harmless in the sterilization chamber (31). The flammable exhaust gas (G ₂ ) usually taken out at the first time has a concentration capable of self-burning, but the flammable exhaust gas (G ₂ ) taken out at the second time and thereafter is extremely low. Its concentration is so low that it cannot be burned.

[0005] As shown in FIG. 2, the direct combustion type incineration apparatus (40) has a combustion chamber (41a) arranged at the center and a burner (41) provided at one end of the combustion chamber (41a). 42)
And a preheating chamber (4) formed around the combustion chamber (41a).
4) and a gas inlet (45) communicating with the preheating chamber (44).
And a gas discharge port (46) provided on the other end side of the combustion chamber (41a). The combustible exhaust gas (G ₂ ) discharged from the sterilization apparatus (30) is supplied to the gas inlet (4).
5) and is preheated in the preheating chamber (44). The preheated combustible exhaust gas (G ₂ ) is a punch metal (4
3) into the combustion chamber (41a) via the burner (42).
It is burned with the flame of the fuel gas (G) supplied to the tank.
And to become odorless, non-toxic air emissions gas (G _3).

As shown in FIG. 3, the catalytic incineration apparatus (50) has a gas inlet (51) disposed at one end thereof,
Heating chamber with heat exchanger (52) for preheating and burner
(53), a catalyst tank (54), a reaction tank (55), an exhaust duct (56), an exhaust heat supply section (57) for supplying exhaust heat to the heat exchanger (52), and a gas discharge section. And an outlet (58). The combustible exhaust gas (G2) discharged from the sterilization apparatus (30) is introduced from the gas inlet (51) and preheated in a heat exchanger (52). And heating room
The minimum temperature at which the catalyst reacts stably in (53) (for example, about 2
50 ° C .: hereinafter referred to as “base temperature (T ₁ )”, and then pass through the catalyst tank (54) and the reaction tank (55) to be oxidatively decomposed and become odorless. This results in odorless and harmless atmospheric release gas (G ₃ ).

[0007]

However, according to the conventional direct combustion type incineration apparatus (40), the combustion chamber (41)
Since the temperature in a) needs to be maintained at a high temperature, there are the following difficulties. That is, since the concentration of the combustible exhaust gas (G ₂ ) taken out from the sterilization apparatus (30) for the second time or later is extremely low and cannot be self-combustible, it is necessary to prevent generation of unburned gas. It is necessary to perform oxidative decomposition in a high-temperature atmosphere. For this reason, even when the combustible exhaust gas (G ₂ ) is taken out a plurality of times, or when the direct combustion type incinerator (40) is preheated, the combustion chamber (41) is also used.
It is necessary to maintain the temperature in a) at a high temperature, for example, about 760 ° C., which consumes a large amount of fuel gas and increases running costs.

On the other hand, according to the catalytic incineration apparatus (50), since the temperature in the heating chamber (53) is a low base temperature (T ₁ ), the combustible exhaust gas (G ₂ ) is discharged a plurality of times. Although the fuel consumption during standby and preheating when taking out is small, there are the following drawbacks. That is, the combustible exhaust gas taken out of the sterilization apparatus (30) for the first time.
Since the concentration of (G ₂ ) is high and it is capable of self-combustion, if it passes through the catalyst tank (54) without dilution, the catalyst tank is burned. Therefore in order to avoid burning of the catalyst vessel, it is necessary to lower the concentration of the combustible for Jin gas (G ₂₎ is diluted to 10 to 30-fold in air.
However, in this case, the processing amount of the diluted combustible exhaust gas (G ₂ ) is increased by 10 to 30 times, so that the processing time is greatly extended, and as a result, the processing amount of the fuel gas is also increased and the running cost is increased. .

The present invention has been made in view of such circumstances, and has as its object to reduce the consumption of fuel gas and the amount of flammable exhaust gas, shorten the processing time, and reduce running costs. It is an object of the present invention to provide a combustible exhaust gas incinerator capable of reducing the amount.

[0010]

In order to solve the above-mentioned problems, the present invention is configured as follows. That is, claim 1
The burner (2a) burns the combustible exhaust gas (G ₂ ) in the combustion chamber (1a) in the combustion chamber (1a). ), A catalyst tank (21) is provided downstream of the flammable exhaust gas (G ₂ ).
In the case where is not self-combustible, the flammable exhaust gas (G ₂ ) is maintained at the base temperature (T ₁ ) and is oxidized in the catalyst tank (21). .

According to a second aspect of the present invention, there is provided the flammable exhaust gas incineration apparatus according to the first aspect, wherein the combustion temperature of the flammable exhaust gas (G ₂ ) is set in the combustion chamber (1a). A cooling means (12) for suppressing the rise is provided, and when the flammable exhaust gas (G ₂ ) is self-combustible, the cooling means (12) is operated to activate the flammable exhaust gas (G ₂ ). ₂ ) The combustion temperature is maintained so as to be lower than the catalyst maintenance temperature (T ₂ ).

According to a third aspect of the present invention, in the incinerator for combustible exhaust gas according to the second aspect, the cooling means (12) includes a cooling air (A ₂ ) in the combustion chamber (1a). ), An air volume adjusting means (14), and a temperature detecting means for detecting the temperature on the upstream side of the catalyst tank (21).
And a control circuit based on the detected temperature.
And at least one of the blower (13) and the air volume adjusting means (14) is driven and controlled via the control unit.

According to a fourth aspect of the present invention, in the flammable exhaust gas incinerator according to the second aspect, the cooling means (12) includes a cooling water spray (A) in the combustion chamber (1a). ₃ )
And an on-off valve (28) capable of adjusting the amount of supplied water, and a temperature detecting means (24) for detecting the temperature on the upstream side of the catalyst tank (21). The on-off valve (27) is configured to be opened / closed and metered through a control circuit (26) based on the detected temperature.
The flammable exhaust gas referred to in the present invention includes not only a gas composed of flammable gas alone but also a gas diluted with a mixture of nonflammable gas such as air and carbon dioxide gas.

[0014]

In the invention described in claim 1 [Operation and Effect of the Invention, when combustible for Jin gas (G ₂₎ is capable self燃不is basal temperature (T ₁ the combustible for Jin gas (G ₂₎ ), Keep the above combustion chamber
The non-combustible components are completely oxidized in a catalyst tank (21) provided downstream of (1a). That is, the amount of fuel supplied to the burner (2) is sufficient if the combustible exhaust gas (G ₂ ) can be maintained at the base temperature (T ₁ : for example, approximately 250 ° C.). This allows
During standby for taking out combustible exhaust gas and during preheating of the present apparatus, it is not necessary to maintain the combustion chamber at a high temperature as in the direct combustion type incinerator of the conventional example 1;
The running cost can be reduced.

According to the second aspect of the present invention, when the combustible exhaust gas (G ₂ ) is capable of self-combustion, the combustion chamber (1a)
Activates the cooling means (12) attached to the combustion chamber (1).
a) Cool the inside to convert the combustible exhaust gas (G ₂ ) to the catalyst maintenance temperature.
(T ₂ ) or less and self-burn. At this time, even if unburned components are generated, the oxidation treatment is completely performed in the downstream catalyst tank (21).
Thus, it is not necessary to dilute the combustible exhaust gas unlike the catalytic incineration apparatus of the second conventional example, so that the amount of exhaust gas to be processed can be suppressed and the processing time can be shortened. Further, the heat load on the catalyst tank (21) is small, and burning of the catalyst tank (21) can be avoided.

According to the third or fourth aspect of the present invention,
The temperature on the upstream side of the catalyst tank (21) is detected by temperature detecting means (24).
The cooling means (12) is operated based on the detected temperature. That is, if the detected temperature on the upstream side of the catalyst tank (21) greatly exceeds the base temperature (T ₁ : for example, 250 ° C.), it is determined that the combustible exhaust gas (G ₂ ) is in the self-combustion state. The control circuit (26) makes a judgment and activates the cooling means (12) to maintain the inside of the combustion chamber (1a) below the catalyst maintenance temperature (T ₂ ). Accordingly, it is possible to suppress fuel consumption and reduce running costs while avoiding burning of the catalyst tank (21).

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a combustible exhaust gas incineration apparatus according to an embodiment of the present invention. This incinerator has a combustion chamber composed of a heat-resistant casing (1).
(1a), a burner (2) for burning the fuel gas (G ₁ ) and the combustible exhaust gas (G ₂ ) in the combustion chamber (1a), and a combustible exhaust gas in the combustion chamber (1a). A cooling means (12) for suppressing an increase in the combustion temperature of the gas (G ₂ ); and the combustion chamber (1a)
(21) provided in the catalyst processing section (20) downstream of
And a gas outlet (22).

The burner (2) is provided with a combustible exhaust gas (G ₂ ).
A burner body (3) provided with an inlet port (4) of the same type and having a tip portion protruding into the combustion chamber (1a), and a combustion chamber coaxially inserted into the burner body (3). Air introduction cylinder (5)
And a fuel gas introducing cylinder (6) coaxially inserted into the combustion air introducing cylinder (5) so that the combustible exhaust gas (G ₂ ) is burned in the combustion chamber (1a). It is configured.

The cooling air (A ₂ ) supplied by the cooling means (12) is diffused into the combustion chamber (1a) on the outer periphery of the tip of the burner body (3) on the side of the combustion chamber. A perforated plate (punch metal (11)) to be supplied is mounted.
A long ignition electrode (7) is inserted on the center axis of the fuel gas introduction cylinder (6), and the ignition electrode (7) and the fuel gas introduction cylinder (6) are connected to a base end cylinder (8). Supported by the ignition electrode
(7) is conductively connected to an ignition transformer (10).

The cooling means (12) is provided in the combustion chamber (1a).
A blower (13) for supplying cooling air (A ₂ ) into the inside, a damper (14) as an air volume adjusting means, a damper driving means (15) for driving the damper (14), and the catalyst tank (21). ) And a temperature detecting means (24) for detecting the temperature on the upstream side of the blower.
The configuration is such that the air volume of (13) is adjusted and the damper (14) is metered through the damper driving means (15).

That is, the detected temperature on the upstream side of the catalyst tank (21) is the base temperature (T ₁ : for example, 2) at which the catalyst reacts stably.
50 ° C), the combustible exhaust gas (G ₂ )
Is determined to be a concentration at which self-burning is impossible, and the non-combustible gas is completely treated in the catalyst tank (21). If the detected temperature greatly exceeds the base temperature (T ₁ ), it is determined that the combustible exhaust gas (G ₂ ) is in a self-combustion state, and for example, the opening degree of the damper (14) is increased. Activate the cooling means (12) to increase the amount of cooling air (A ₂ ) introduced into the combustion chamber (1a), and thereby reduce the temperature of the gas passing through the catalyst tank (21) to the heat resistance of the catalyst. Catalyst maintenance temperature (T ₂ : about 600 ° C)
The heat load on the catalyst tank (21) is reduced by maintaining the temperature below.

Thus, the fuel consumption can be suppressed and the running cost can be reduced while avoiding burning of the catalyst tank (21). That is, it is not necessary to maintain the inside of the combustion chamber (1a) at a high temperature as in a direct combustion type incinerator during standby for taking out combustible exhaust gas or during preheating of the present apparatus, so that fuel consumption is suppressed. In addition, the running cost can be reduced. Further, since it is not necessary to dilute the combustible exhaust gas unlike the catalytic incineration apparatus, the amount of the exhaust gas to be processed can be suppressed and the processing time can be shortened.

The catalyst processing section (20) and the gas discharge port (22)
And the cooling air (A ₂ ) supplied by the blower (13).
An air inlet (23) for introducing a part of the air is provided. When the flammable exhaust gas (G ₂ ) is self-burned while maintaining the temperature of the gas passing through the catalyst tank (21) at or below the catalyst maintenance temperature (T ₂ ), the downstream of the catalyst tank (21) is used. The temperature of the odorless and harmless released gas (G ₃ ) is sufficiently lowered by adjusting the opening of the damper (17) by the control circuit (26) based on the detection of the temperature on the side by the temperature detecting means (24). Let it. In FIG. 1, reference numeral 16 denotes an inlet for cooling air, 18 denotes a flame monitoring device provided with an ultraviolet photoelectric switch, and 19 denotes a viewing window.

Instead of the cooling means (12), for example, a spray means (27) indicated by a phantom line in the combustion chamber (1a), an on-off valve (28) capable of adjusting the amount of supplied water, Tank
Temperature detecting means (24) for detecting the temperature on the upstream side of (21) may be provided. In this case, based on the temperature detected by the temperature detecting means (24), the on-off valve (27) is opened / closed and metered through a control circuit (26) so that an appropriate amount of gas is stored in the combustion chamber (1a). Of cooling water spray (A ₃ ) of the combustion chamber (1a)
While maintaining the temperature below the catalyst maintenance temperature (T ₂ ), the combustible exhaust gas (G ₂ ) is self-combusted. Further, the non-combustible components are completely oxidized by the catalyst tank (21).

The present invention is not limited to the above embodiment, and the sterilization apparatus (30) is not always required. In addition, the incineration apparatus according to the present invention is applicable not only to odorous gas and sterilized gas, but also to incineration of a wide variety of combustible exhaust gases that lead to environmental pollution.
Further, a liquid containing a combustible exhaust gas, such as wastewater in which a sterilizing gas is dissolved, may be sprayed into the combustion chamber (1a) by the spraying means (27) constituting the cooling means (12) for incineration. It is possible.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an incineration apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a direct combustion type incineration apparatus and a sterilization apparatus according to Conventional Example 1 in association with each other.

FIG. 3 is a schematic diagram of a catalytic incineration apparatus according to Conventional Example 2.

[Description of Signs] 1a: combustion chamber, 2: burner, 12: cooling means, 13: blower, 14: air volume adjusting means, 21: catalyst tank, 24: temperature detecting means, 26: control circuit, 27: spraying means, 28 ... off valve, A ₂ ... cooling air, A ₃ ... cooling water spray, G ₁ ... fuel gas, G ₂ ... combustible for Jin gas, T ₁ ... basal temperature, T ₂ ... catalyst conservation temperature.

Claims (4)

[Claims] An incinerator for combustible exhaust gas configured to burn a combustible exhaust gas (G ₂ ) in a combustion chamber (1a) with a burner (2) in the combustion chamber (1a). If the flammable exhaust gas (G ₂ ) is not self-combustible, the flammable exhaust gas (G ₂ ) is maintained at the base temperature (T ₁ ). Above the catalyst tank
An incineration apparatus for combustible exhaust gas, wherein the apparatus is configured to perform oxidation treatment in (21). 2. The incineration treatment apparatus for combustible exhaust gas according to claim 1, wherein said combustion chamber (1a) includes a cooling means for suppressing a rise in the combustion temperature of said combustible exhaust gas (G ₂ ). 12), and if the combustible exhaust gas (G ₂ ) is self-combustible, the cooling means
(12) is operated to maintain the combustion temperature of the combustible exhaust gas (G ₂ ) at or below the catalyst maintenance temperature (T ₂ ). Processing equipment. 3. The incineration treatment apparatus for combustible exhaust gas according to claim 2, wherein said cooling means (12) is provided with cooling air in said combustion chamber (1a).
A blower (13) for feeding (A ₂ ) and an air volume adjusting means (14)
And a temperature detecting means (24) for detecting the temperature on the upstream side of the catalyst tank (21), and a control circuit based on the detected temperature.
The air blower (13) and the air volume adjusting means (14) via (26)
Wherein the drive control of at least one of the above is performed. 4. An incineration apparatus for combustible exhaust gas according to claim 2, wherein said cooling means (12) supplies a cooling water spray (A ₃ ) into said combustion chamber (1a). (27), an on-off valve (28) capable of adjusting the amount of supplied water, and temperature detecting means (24) for detecting the temperature on the upstream side of the catalyst tank (21), and a control circuit based on the detected temperature. (26) via the on-off valve (2)
7. An incineration treatment apparatus for combustible exhaust gas, wherein the apparatus is configured to control opening / closing and metering of 7).