JPH0729382Y2 - Explosion proof device in combustion chamber in direct combustion type exhaust gas deodorizing device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention applies to offensive odor exhaust gas generated from a waste plastic melting furnace, various industrial waste offensive odors, polyester varnish offensive odor, night soil / sewage treatment plant, coating / chemicals. The present invention relates to an explosion-proof device in a combustion chamber that is used by being installed in an exhaust gas deodorizing device used to remove a bad odor in a factory or the like.

[Prior Art] In the process of treating waste plastic, for example, when a styrofoam toilet or packaging container is heated and melted, a large amount of styrene gas, which has a harmful effect on the human body, is generated from the melting furnace used for this. To do.

The toxicity of styrene gas in animal experiments is very strong, and it shows a relaxing effect on mucosal stimulation at 600 to 1200 ppm for 12 to 20 hours.

2500ppm Strong irritation, anesthesia, unconsciousness after 10 hours of inhalation.

5000 ppm One hour later, irritation of airway mucosa and pulmonary edema occur, resulting in death.

10000ppm A few minutes later, irritation of airway mucosa and pulmonary edema occur, resulting in death.

In limited human experimentation, 600ppm, strong odor, eye and nose irritation.

200-400ppm Strong unpleasant odor, transient eye and nose irritation.

100ppm Strong but withstandable odor.

60ppm Smell but no mucosal irritation.

10ppm No odor.

Therefore, it is considered safe if it has an odor or mild irritation that can be tolerated, and the allowable concentration of styrene by the Japan Society for Occupational Health is limited to 50 ppm. It is necessary to deodorize and purify the exhaust gas into a safe state by some means.

At present, the typical deodorizing methods for offensive odor exhaust gas are: (1) water washing method (dissolving water-soluble components such as ammonia,
However, there is a limit. (2) Chemical solution absorption method (absorption and decomposition with acid, alkali, oxidizer, etc.) (3) Adsorption method (adsorption with activated carbon, etc. with adsorbent) (4) Direct combustion method (combustion decomposition oxidation at 650 ° C or higher) (5) ) Catalytic oxidation method (using platinum-based catalysts,
(Oxidative decomposition at temperatures up to 400 ° C) (6) Ozone oxidation method (combining oxidative decomposition with ozone and masking) (7) Masking method (concealing malodorous components using aromatic components).

Of these, the direct combustion method (4) removes malodorous components at high temperature (65
Oxidative decomposition at 0 ℃ or more) to change to carbon dioxide and water vapor to deodorize. Unlike other deodorizing methods, not only styrene gas but also a wide range of combustible odor components such as hydrogen sulfate and ammonia are removed at the same time. It is possible that the deodorizing effect is outstanding, and the Japanese Patent Publication No.
It was put into practical use by the invention of No. 9211 and is well known to the general public.

[Problems to be solved by the invention] However, when the above-mentioned direct combustion method is applied to remove flammable malodorous exhaust gas with remarkable ignitability such as styrene gas, the styrene gas in the malodorous exhaust gas often burns. There is a risk of explosion in the room, destroying the combustion equipment, and harming workers.

An object of the present invention is to provide an explosion-proof device having a function of avoiding such an explosion or an explosion phenomenon in the combustion chamber, and capable of safely and reliably removing the combustible malodorous components in the malodorous exhaust gas. It is in.

[Means for Solving the Problems] In order to address the above-mentioned problems, the present inventor has proposed the explosive concentration of styrene gas, which is the most dangerous and explosive, among the combustible malodorous components contained in the malodorous exhaust gas. As a result of thorough clarification of the above, the two combustion cylinders connected to each other in the machine frame are vertically displaced and arranged in parallel in the vertical direction, and the inside of the lower combustion cylinder is formed in the first combustion chamber and the upper combustion chamber is formed. The inside of the combustion cylinder is formed as a second combustion chamber, the red heat guide plate is arranged at the upper part of the first combustion chamber, the first burner and the steam separation chamber are arranged at the lower part thereof, and the second combustion chamber is formed. An exhaust window and a perforated red hot plate are arranged in the upper part of the chamber, a second burner is arranged in the lower part thereof, and a fuel supply pipe and an ignition plug are arranged in the first burner and the second burner, respectively. A steam separation chamber is connected to one combustion chamber, and waste plastic is placed in the steam separation chamber. In a direct combustion type exhaust gas deodorizing device that is connected to a trap connected to a foul-smelling exhaust gas source such as a melting furnace, the content of the detonation gas in the stench To solve the above-mentioned problems by means of connecting a forced air blower with an air flow control device that dilutes below the explosion concentration and incorporating a solid adsorbent layer that removes impurities in malodorous exhaust gas inside the trap. Is a successful one.

[Operation] As a result of the experiment, among the combustible gases contained in the malodorous exhaust gas, the explosive concentration of styrene gas, which has the highest degree of induction, is 1.0 to
Since it is in the range of 6.0%, if this is diluted in advance with a forced air blower equipped with an air flow control device, the content of induced gas in the offensive odor exhaust gas will be diluted to below the explosion concentration (1.0%) and supplied to the combustion chamber, It is possible to prevent gas explosion in the combustion chamber before it happens.

[Embodiment] The following will specifically describe the drawings showing an embodiment of the present invention. The malodorous exhaust gas deodorizing apparatus S of FIG. 1 shows an example of the most typical implementation structure of the present invention. .

In the drawings, reference numeral 1 is a machine frame that is a frame of the device S.
Inside, the square-shaped combustion cylinders 11 and 12 are vertically displaced and connected in parallel in the vertical direction, and the lower combustion cylinder 11 is connected to the first combustion chamber R.
1, the upper combustion cylinder 12 is the second combustion chamber R2,
A red heat guide plate 1 with windmill-shaped blades above the combustion chamber R1.
3. The first burner 14 and the steam separation chamber 15 are provided in the lower part, and the exhaust window 16 and the perforated red hot plate are provided in the upper part of the second combustion chamber R2.
17, the second burner 18 is installed at the bottom, the first burner
The fuel supply pipes 19 and 20 and the spark plugs 2 and 3, which are bifurcated, are attached to the 14 and the second burner 18, respectively.

Further, the air / water separation chamber 15 is connected to the first combustion chamber R1 by several air guide pipes 8, and the bottom of the opposite side thereof is connected via a flexible pipe 5 to a forced air blower 4 with an air flow rate adjusting device. And a trap 6 connected to a foul-smelling exhaust gas source such as a waste plastic melting furnace
Inside the trap 6, a solid adsorbent layer 7, for example, a solid adsorbent layer 7 in which caustic soda is impregnated with acid clay and dried, is packed in two steps.

Since the deodorizing device of the present invention has the above-mentioned structure, the malodorous exhaust gas discharged from the malodorous gas emission source such as a waste plastic melting furnace is fed into the trap 6 from below, and this is mixed with the solid adsorbent layer 7 in the trap 6. After removing impurities by filtering with, the first combustion cylinder in the upper part is passed through the steam separation chamber 15.
Burners 14, 18 that supply odorous exhaust gas containing styrene gas, etc. to combustion chambers R1, R2 by sequentially supplying 11 and second combustion cylinder 12
After being burned by heating, the combustible malodorous components contained in the malodorous exhaust gas are oxidized and decomposed by combustion, and then discharged as harmless gas completely deodorized and purified through the upper exhaust window 16.

In this case, since the forced air blower 4 with an air volume adjusting device is connected to the bottom of the air / water separation chamber 15 via the flexible tube 5,
Of the combustible gases contained in the foul-smelling exhaust gas, the explosive concentration of styrene gas, which has the highest degree of induced explosion, is in the range of 1.0% to 6.0% when using the device. By using the forced blower 4 to dilute the odorous gas content in the foul-smelling exhaust gas to below the explosion concentration (1.0%) and supply it to the combustion chamber, the gas explosion in the combustion chambers R1 and R2 can be prevented in advance. be able to.

[Advantage of the Invention] As described above, in the present invention, the two combustion cylinders connected to each other in the machine frame are vertically displaced and arranged in parallel in the vertical direction, and the inside of the lower combustion cylinder is disposed in the first combustion chamber. To form a second combustion chamber in the upper combustion cylinder and to form a red heat guide plate in the upper part of the first combustion chamber and the first burner and steam separation chamber in the lower part, An exhaust window and a perforated red hot plate are provided above the second combustion chamber, and a second burner is provided below the exhaust window, and a fuel supply pipe and an ignition plug are provided at the first burner and the second burner, respectively. The air-water separation chamber is connected to the first combustion chamber, and the air-water separation chamber is connected with a trap connected to a foul-smelling exhaust gas source such as a waste plastic melting furnace. Exhaust gas is first burned in the first combustion chamber, and this malodorous exhaust gas is It will be re-combusted in the second combustion chamber and discharged from the exhaust window, and due to this multi-stage combustion, it can be sent to the atmosphere with the combustible and malodorous components in the malodorous exhaust gas reliably removed, and has an outstanding deodorizing ability. A forced air blower with an air volume control device that dilutes the content of the explosive gas in the malodorous exhaust gas to below the explosive concentration is connected to the malodorous gas introduction path that can be exhibited and is connected to each combustion chamber. It is possible to avoid the explosion or the explosion phenomenon in the combustion chamber, which has been a problem of the conventional device, with a very simple structure, and to safely and reliably remove the combustible malodorous components in the malodorous exhaust gas. Further, since the solid adsorbent layer is built inside the trap, impurities can be removed by filtering the exhaust malodorous gas with the solid adsorbent layer inside the trap. For combustion in Ku multistage in each combustion chamber can be discharged to the outside as deodorizing clarified harmless gas, it will provide a good exhaust gas sweetening system.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a concrete implementation structure of an explosion-proof device according to the present invention, and FIG. 2 is a side view of the same. S ... Exhaust gas deodorizing device, R1 ... First combustion chamber, R2 ... Second combustion chamber, 1 ... Machine frame, 4 ... Forced air blower with air volume control device, 6 ... Trap, 11.12 ... … Combustion tube, 13 …… Red heat guide plate, 14 …… First burner, 15 …… Steam separation chamber, 18 ……
Second burner, 19 …… Fuel supply pipe, 20 …… Spark plug.

Claims (1)

[Scope of utility model registration request] 1. Two combustion cylinders connected to each other in a machine frame are vertically displaced and arranged in parallel in a vertical direction, and the inside of the lower combustion cylinder is formed as a first combustion chamber and the upper combustion cylinder is formed. The inside is formed as a second combustion chamber, the red heat guide plate is arranged in the upper part of the first combustion chamber, the first burner and the steam separation chamber are arranged in the lower part thereof, and the upper part of the second combustion chamber is formed. An exhaust window and a perforated red hot plate, and a second burner below the first burner, and a fuel supply pipe and an ignition plug for the first burner and the second burner, respectively. In the direct combustion type exhaust gas deodorizing device in which a steam / water separation chamber is connected to the air / water separation chamber, and a trap connected to a malodorous exhaust gas generation source such as a waste plastic melting furnace is connected to the combustion chamber Reduce the concentration of explosive gas in the stench exhaust gas to below the explosion concentration in the stench exhaust gas introduction route. Direct combustion type exhaust gas deodorization characterized by being connected to a forced air blower with an air flow control device for thinning and having a built-in solid adsorbent layer for removing impurities in malodorous exhaust gas inside the trap Explosion-proof device in the combustion chamber of the equipment.