JPS582520A - Waste gas burning device - Google Patents

Abstract

PURPOSE:To dispose of waste gas at a low combustion temperature by mixing the waste gas with additive air sufficiently and evenly, by a method wherein the waste gas led into a furnace is mixed and preheated while it is passing through the external circumference of an inner cylinder, which is additionally burnt by a burner and is sent to the internal circumference of the inner cylinder. CONSTITUTION:Waste gas 11 supplied from a waste gas intake 28 together with additional air 12 supplied from an additional air intake 29 are agitated sufficiently by a guide plate 27 within a space 26 formed between an outer cylinder 21 and an inner cylinder 22, which is preheated by the red-out inner cylinder 22, sent to a burner flame 25 part, then sent to the inside of the inner cylinder 22 by turning up as shown by an arrow mark 31 and additionally burnt by a flame 25. A part of remaining heat to be generated at the time of combustion is used for preheating exhaust gas 11 mixed with the additional air 12 passing through the space 26 through the inner cylinder 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an incinerator for waste gas, or an incinerator for noxious waste gas containing odor gas, gas, and organic gas. ,, ,',−
The waste gases emitted from the 1゜1ァ include pediculose water, xylene, toluene, etc., as well as ammonia and sulfide, which are substances deep in the nose. In recent years, awareness of environmental pollution has increased, and factories that generate the above-mentioned toxic rope gas (hereinafter simply referred to as waste gas), which often contains harmful and combustible components with odor components such as hydrogen and acetaldehyde, are taking measures to treat the waste gas. A variety of gas treatment systems have been considered, including those that incinerate the waste gas in an incinerator and those that use chemicals to remove harmful components from the waste gas.

There are two types of waste gas incinerators: those that use the direct combustion method and those that use the catalytic combustion method. 800℃
This is a method of incinerating waste gas at high temperatures before and after decomposing it into harmless, odorless carbon dioxide, water vapor, nitrogen, etc. This method has an extremely high waste gas removal efficiency and rate, and contains no odor that can be perceived even at a small concentration! Suitable for processing gas. In addition, the latter waste gas incinerator uses a catalyst such as quantified nickel or palladium, and is heated to around 2-00℃.
It is a method of oxidizing and decomposing waste gas with relatively low al).
Although it can be processed at low temperatures, it has the disadvantage of low dead gas removal efficiency.

When incinerating waste gas, a heat exchanger is used to effectively utilize the residual heat of the waste gas after incineration.
The method of "8 or waste gas Xl! Preheating additional air for burning" is used in combination. “The present invention relates to a waste gas incinerator (hereinafter simply referred to as an incinerator) that uses a direct combustion method that can effectively utilize the residual heat of waste gas after incineration. After the explanation of the invention, first, let's look at the typical conventional heat exchanger 8 as shown in Figure 1.
1. Ena incinerator (2) equipped with (1) will be explained.

, 1. ,, The incinerator (2) is provided with an auxiliary combustion chamber (5) equipped with a waste gas guide, an inlet (S), and an auxiliary combustion burner (4).
) is connected at one end to the combustion chamber (6), and the inner diameter 11 of the combustion chamber (6) is larger than the inner diameter 12 of the auxiliary combustion chamber. The exhaust gas outlet (7) of the combustion chamber (@) is connected to the heat exchanger (1), and the heat exchanger (1) has an additional air introduction pipe (8) for combustion of the exhaust gas. The preheated air pipe (9) is connected to the middle of the waste gas introduction pipe aΦ, and the waste gas introduction pipe (to) is connected to the waste gas introduction port of the incinerator (2). Q(ItC connected.

Considering the effects of the conventional incinerator (2) configured in this way, in a furnace that incinerates brittle gas containing a high concentration of flammable substances, the waste gas supplied from the waste gas introduction pipe αQ Oυ is preheated in a heat exchanger, mixed near the corpse gas inlet (3) with additional combustion air (2) sent through a preheated air pipe (9), and then supplied to the auxiliary combustion chamber (5). Ru.

The waste gas (b) that has been assisted in the auxiliary combustion burner (4) in the auxiliary combustion chamber (5) is combusted in the combustion chamber (6), decomposed by oxidation, becomes odorless and harmless, and is burned as leg gas (b) after treatment. Exchanger (1
) will be sent to. After this treatment, the waste gas side is the incinerator outlet (7)
The heat exchanger (1) usually has a high temperature of about 860°C, although it varies depending on the constituent components of the waste gas to be treated.
After passing through, it is cooled to around 600°C.

In the conventional incinerator (1) explained above, brittle gas (
After mixing the additional air (6) with the heat exchanger 11 (υ), there is a possibility that the horse gas will explode in the heat exchanger 1I (1). Place the book on the heat exchanger (
1) - Preheat, then □After that, incinerator (waste air inlet)
(3) It is configured so that it is mixed with the corpse gas (6) near the χ inlet and introduced into the auxiliary combustion chamber (6). As a result of 10X1 removal, the gas is uniformly homogenized and mixed with enough oxygen.
For example, even if the treatment can be carried out at about 760°C, the treatment temperature is set at 860°C because sufficient oxygen is not provided to the two parts of the waste gas. In addition, it is necessary to ensure that the waste gas ασ stays in the furnace for a long time.8 Therefore, the amount of fuel for auxiliary combustion is required to be ◆, and the incinerator (2) itself is also large. was there.

The present invention has been made for the purpose of overcoming the above-mentioned drawbacks. In other words, the gist of the present invention is that the bottom part of a cylindrical incinerator
A burner is provided at one end, and an open port with a diameter smaller than the inner diameter of the incinerator is provided at the other end, and a metal middle cylinder with both ends open is inserted into the open port with a trowel, and the incinerator is opened. Brittle gas inlet and additional air near the mouth! (The inlet is installed to mix and preheat the waste gas introduced into the furnace and additional air while passing around the outer periphery of the middle cylinder, and to auxiliary combustion of the gas in the burner. , a seed gas fIIA1 characterized in that it is configured to be folded back and sent to the inner periphery of the middle cylinder for combustion.
1fi4, and the present invention will be explained with reference to the embodiments and drawings. (Heat-resistant steel) The middle tube (2) has a double groove. One end B of the outer cylinder is equipped with a burner for auxiliary combustion, and the other end B is externally open c1@
At the same time, its external opening is established.

In the WSC, a middle cylinder (end) is fitted according to the inner diameter, and the length is set appropriately so that the tip reaches near the burner flame*m. There is a space (2
) is formed, and mixing guide plates (roll) are protruded from the four sides of the space (to), and I! A waste gas inlet mx'' and an additional air inlet (2) are provided on the side surface near end B of the outer cylinder (2), and a damper for adjusting the additional air inlet pipe is provided.

In addition, the shape of the mixing guy fJk (2) mentioned above and the exhaust gas inlet (end) are added! Regarding the shape of the air inlet ■, as shown in Figure 3, the middle cylinder (for waste gas aη or additional air)
2) A guide plate may be provided parallel to the longitudinal direction of the outer cylinder (2) or the inner cylinder 4 so as not to rotate around the outer cylinder (2), or conversely, as shown in FIG. 11
It is connected to the outer wall of 1I4 at a slight angle, and the outer i1 is connected so that the waste gas (2) or additional air rotates around the middle cylinder (support).
A guide plate (b) may be provided in a spiral shape on the wall surface of the 1@ or middle cylinder.

The functions and effects of the incinerator so configured will be explained below.

The waste gas ■ supplied from the waste gas inlet (2), together with the additional air sent from the additional air introduction row, flows into the space (end) formed between the outer cylinder shaft and the middle cylinder (2). It is sufficiently stirred by the guide plate (rotation), preheated by the middle cylinder @ which becomes red hot due to the combustion of the waste gas (2), sent to the burner flame (end), and then turned back as shown by arrow 01). It is sent to the internal section of I4@ and auxiliary combustion is carried out in the flame. □ A part of the residual heat generated during combustion is used to preheat the waste gas (b) mixed with additional air (b) passing through the space through the middle cylinder (2).

A damper (2) is installed near the entrance of the additional air introduction row to adjust the air flow rate, and adjusts the optimal amount of additional air (2) required for combustion according to the components of the waste gas (6). It can be sent into the furnace. Also, depending on the composition of the waste gas, it is possible to stop the supply of additional air.
If it is necessary to shorten the residence time in the furnace, a guide plate is provided parallel to the longitudinal direction of the furnace as shown in No. 311.
One method is to prevent the waste gas (b) from rotating inside the furnace.

As described above, in this example, the optimal amount of additional air necessary for combustion with the waste gas (b) is sufficiently 1
Since the balls are agitated and mixed uniformly, even if conventional waste gas treatment required maintaining the temperature of the combustion chamber (6) at about +f860°C, it can be successfully processed at about 760°C, and the waste Since the time required for gas (b) to remain in the furnace is also shortened, the furnace itself can be downsized. The waste gas (b) can be preheated in the furnace using the residual heat of combustion, and the incinerator (1)
Since it also serves as the heat exchanger (1), the concentration of the waste gas is within the lower explosive limit (LEL), which is the lower limit of the waste gas that causes an explosion due to heating when mixed with oxygen. burns without exploding, and releases waste gas (
When preheating (b), there is no need to make the solvent concentration of the waste gas LxLf)/4IM degrees to prevent explosion. Therefore, energy loss caused by preheating excess air can also be prevented. Additionally, since a heat exchanger is not required outside the incinerator member, the space required for the equipment can be reduced accordingly.

As explained above, the present invention is a waste gas incinerator with a double structure of an outer cylinder and a middle cylinder, in which waste gas and additional air are sent into the space formed by the outer cylinder and the middle cylinder, and the exhaust gas and additional air are thoroughly stirred. The structure is such that after preheating while mixing, auxiliary combustion is performed using a burner.

Therefore, in the waste gas incineration and incinerator of the present invention, the waste gas and additional air are mixed sufficiently and uniformly, and the waste gas can be processed at a lower combustion temperature than in the past, thereby saving fuel required for auxiliary combustion.

Furthermore, the present invention has the advantage that the required residence time inside the furnace can be shortened, making it possible to downsize the furnace itself, and since there is no need to provide a heat exchanger outside the furnace, equipment costs are reduced and installation space is also reduced. There are many effects of shrinking townships.

[Brief explanation of the drawing]

Figure 1 is a #r-plane schematic diagram showing a waste gas incinerator using a conventional direct combustion method, Figure 2 is a cross-sectional schematic diagram showing an embodiment of the present invention, and Figures 3 and 4 are Figures 2 and 4. FIG. 3 is a cross-sectional view taken along the XX line. 1...-heat exchange II 5...assistant combustion chamber 6...combustion chamber 11...waste gas 12・φ additional air
20...Waste gas incinerator 21/Fist cylinder 22
・・Middle tube 24・・External opening 26・・Space 27・
・Guide plate 30-・Dumper agent Patent attorney'
Tsutomu Adachi 12 Figure 1 9 Figure 3 Figure 7 Figure 4 ++, 12

Claims (1)

[Scope of Claims] An incinerator made of metal with a burner provided at the bottom end of an 8-square-shaped incinerator, an open port having a diameter smaller than the inner diameter of the incinerator at the other end, and both ends of the open port being open. Insert the middle cylinder,
Furthermore, a waste gas drip inlet and an additional air inlet are provided near the open opening of the incinerator, and the waste gas introduced into the furnace and additional air as needed are supplied to the outer periphery of the middle cylinder. Mixing and preheating during passage, and auxiliary combustion of the waste gas in the burner;
Also, I am turning back. A waste gas incinerator characterized by being configured so that the gas is sent to the inner periphery of the cylinder for combustion.