JPH06241425A - Smoke consuming apparatus for combustion furnace - Google Patents

Abstract

PURPOSE:To prevent air pollution by improving complete combustion and higher heat efficiency by a method wherein a shutter chamber is provided at an outlet of a furnace and a shutter having numerous pores and a hoisting mechanism is mounted to form secondary combustion furnaces in a plurality of sets at a waste incinerator. CONSTITUTION:A shutter chamber 5 is provided at an outlet of a secondary incinerator 4, for example, in front of a stack thereof. A shutter to be inserted into the shutter chamber 5 is made of a refractory material and is made up of numerous pores as catalyst for promoting complete combustion and a hoisting mechanism. The shutter is mounted free to move into or out of the shutter chamber 5 to form a plurality of secondary combustion furnaces 4 successively. A burner mounting port 12 is provided facing a furnace wall right in front of the shutter chamber 5 and a burner 10 and a blower 11 for secondary air are mounted respectively. The burner and the blower are arranged separately one above the other, for instance, so that flames being jetted into the secondary incinerator 4 will not face each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a smokeless device for a combustion furnace such as a waste incinerator.

[0002]

2. Description of the Related Art When waste is incinerated, smoke or harmful gas contained in the exhaust gas may cause secondary pollution. Although harmless is achieved by completely burning it by secondary combustion, smoke or harmful gas may be emitted due to variations in the secondary combustion state immediately after the start of combustion.

A huge amount of energy is required to raise the temperature of the entire secondary combustion furnace, the thermal efficiency for heating the exhaust gas is not sufficient, and the economical burden is heavy.

[0004]

[Problems to be Solved by the Invention] By partially raising the temperature of the secondary combustion furnace and stabilizing the secondary combustion state of combustion exhaust gas temporally and spatially, complete combustion and improvement of thermal efficiency are realized at the same time, which is economical. It also aims to complete prevention of air pollution.

[0005]

A specific example of the present invention will be described with reference to the drawings. In a secondary combustion furnace for supplying a sufficient temperature and air to the exhaust gas after the primary combustion, a furnace (4)
A shutter chamber (5) is provided in front of the exit of, for example, a chimney or a dust collector.

The shutter (7) to be inserted into the shutter chamber (5) is made of a refractory material such as ceramic, and is connected to a winch or the like as a lifting mechanism (8) and a large number of small holes (6) which are also catalysts for promoting complete combustion. A heat-resistant wire or hook is provided so that it can be put in and out of the shutter chamber (5).

The secondary combustion furnace combined as described above is
Set up two or more sets in series.

【Example】

Burner mounting openings (12) are provided opposite to each other on the furnace wall immediately in front of the shutter chamber (5), and the burner (10) and the secondary combustion air blower (11) are mounted on the furnace wall and inside the furnace. The mounting angles of the burners (10) are alternately inclined so that the flames to be injected do not face each other, for example, when one injection direction is up, the other is down.

In the exhaust part (9) of the exhaust gas subjected to the secondary combustion treatment,
A sensor (13) for sensing the temperature after processing is provided, and the signal thereof is used to automatically lift or lower the shutter (7),
And contact the device for automatic control of the burner (10).

A pretreatment temperature sensor (3) is provided at the entrance of the furnace (4), and its signal is communicated to a device for automating ignition and extinction of the burner (10).

The outside from the exhaust passage after the primary combustion to the exhaust part (9) of the exhaust gas subjected to the secondary combustion is sufficiently shielded by a fireproof heat insulating material.

The treated exhaust gas is discharged into the atmosphere from the chimney (18) through the cyclone (15), the wet dust collector (16), etc., but an induction fan (17) may be provided on the way.

The operating temperature can be set arbitrarily, and the lower limit of the post-treatment temperature sensor (13) is preferably higher than the upper limit of the pre-treatment temperature sensor (3).

A control panel (1) for automatically setting the operating temperature of the post-treatment temperature sensor (13) and the pre-treatment temperature sensor (3), optimal control of each equipment and accident prevention.
9) is provided.

[Action]

When starting the process, the burner (10)
The primary combustion exhaust gas enters the furnace (4) through the passage (2) while the shutter (7) is hung, and when the temperature is low, it stays and is heated by the burner (10). Be warmed.

The secondary combustion exhaust gas heated by the burner (10) is sucked from a large number of small holes (6) of the shutter (7) by a negative pressure by a chimney (18), a dust collector (16), etc. Even if a large number of small holes (6) are slightly difficult to pass in the state where (7) is lowered, not only is the residence time in the furnace (4) lengthened, but also small holes that maintain a high temperature state by re-combustion of the passing exhaust itself ( Complete combustion continues due to the catalytic action of 6).

When the temperature of the exhaust gas passing through the shutter chamber (5) becomes higher than the upper limit set temperature of, for example, about 1200 ° C., the burner (10) first extinguishes the fire by the signal of the post-treatment temperature sensor (13), and further setting is made. When the above high temperature continues, the shutter (7) is lifted, and the exhaust gas that has already been completely burned passes straight through the shutter chamber (5).

When the exhaust gas falls below the lower limit setting temperature, the shutter (7) is suspended, and when the lower limit setting temperature continues, the burner (10) also reignites. Both may be operated simultaneously or in reverse.

When the primary combustion exhaust gas entering the furnace (4) reaches a temperature higher than the set upper limit, the pre-treatment temperature sensor (3) operates to prevent the burner (10) from extinguishing and preventing the furnace (4) from overheating. , Also save energy. When the exhaust gas falls below the lower limit set temperature, the burner (10) reignites.

When the temperature of the primary combustion exhaust entering the furnace (4) becomes lower than the set lower limit, the burner (10) is ignited by the operation of the pretreatment temperature sensor (3) and the temperature in the furnace (4) rises. .

By alternately inclining the mounting angles of the opposite burners (10), mutual flames injected into the cylindrical furnace (4) do not collide with each other, and a so-called "bawlet" shape is formed, and primary combustion exhaust gas is also generated. Rotate to make the temperature in the furnace (4) uniform and promote complete combustion.

When the temperature of the exhaust gas passing through the shutter chamber (5) becomes low, the shutter (7) is suspended by the post-treatment temperature sensor (13), and the exhaust gas passes through the small holes (6) and is completely combusted.

When two or more secondary combustion furnaces combined as described above are connected in series, the high temperature treatment time and the number of passages are increased, so that the secondary combustion treatment is completed more completely.

[0024]

[Effect] According to the present invention, the temperature of the secondary combustion furnace is partially increased to save the heat energy, and the secondary combustion temperature of the combustion exhaust is also stabilized temporally and spatially to improve complete combustion and thermal efficiency. At the same time, economic efficiency can be improved.

There is no danger of polluting the air by discharging smoke or harmful gas, and the incineration of waste materials is promoted.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of a process before and after the present invention,

FIG. 2 is a perspective view when two sets of secondary combustion furnaces are connected in series,

FIG. 3 is a perspective view of a shutter,

FIG. 4 is a partial sectional view showing an example of opposing burner mounting portions.

[Explanation of symbols]

 1 Incinerator 2 Primary combustion exhaust passage 3 Pre-treatment temperature sensor 4 Secondary combustion furnace 5 Shutter chamber 6 Small hole 7 Shutter 8 Lifting mechanism 9 Discharge of exhaust after treatment 10 Burner 11 Blower for secondary combustion air 12 Burner attachment port 13 Post-treatment temperature sensor 14 Exhaust passage to post-process 15 Cyclone 16 Wet dust collector 17 Induction fan 18 Chimney 19 Control panel

Claims (3)

[Claims] 1. In a secondary combustion furnace (hereinafter, simply referred to as a furnace) for supplying a sufficient temperature and air to the exhaust gas after the primary combustion, a shutter chamber (5) is provided at the outlet of the furnace (4), and a large number of shutter chambers (5) are provided. A smokeless device for a combustion furnace having one or more secondary combustion furnaces in which the small holes (6) and a shutter (7) having a lifting mechanism (8) are combined. 2. A burner mounting port (12) is provided opposite to the furnace wall immediately in front of the shutter chamber (5), and a burner (10) and a blower (11) for secondary combustion air are mounted on each, and a furnace is installed. A smokeless device for a combustion furnace, in which the mounting angles of the burners (10) are alternately inclined so that the flames injected into each other do not face each other. 3. A post-treatment temperature sensor (13) is provided for the exhaust part (9) of the exhaust gas subjected to the secondary combustion treatment, a pre-treatment temperature sensor (3) is provided at the inlet of the furnace (4), and a shutter (7) A smokeless device for a combustion furnace in which lifting and ignition of a burner (10) are automated.