JP2000291932A - Waste solid fuel processing method and apparatus - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In the treatment of solid fuel in refuse incinerators, by introducing a relatively simple device, the combustion state in the furnace is maintained constant, thereby discharging harmful gas and unburned gas. Provided is a method and an apparatus for treating solid waste in a reduced incinerator. SOLUTION: The method for treating refuse solid fuel in which a sulfur component-containing material and refuse solid fuel are co-fired in an incinerator, comprising:
A method for treating refuse solid fuel, comprising: measuring SO _X concentration at a furnace outlet or a chimney; and controlling a supply amount of the sulfur-containing material and / or refuse solid fuel based on the measured value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating solid fuel, and more particularly to a method and an apparatus for treating solid fuel in a fluidized bed incinerator for efficiently reducing dioxins.

[0002]

[Prior Art] Refuse Derived Fue
Fluid bed incinerators are widely used as incinerators for incinerating (hereinafter abbreviated as "RDF"). FIG. 2 shows a schematic diagram of a representative example. In the fluidized bed incinerator, RDF is introduced into the fluidized bed incinerator 21 from the RDF charging machine 22 and is dried and ignited by the sand layer flowing by the air sent from the wind box 25 below the dispersion plate 24. .
The ignited RDF is burned in the furnace 21 and the combustion is completed. After incineration, the exhaust gas flows from the furnace outlet 26 to the exhaust gas treatment device 3
After that, the air is discharged from the chimney 32 to the outside.

[0003]

When RDF is incinerated in such a fluidized bed incinerator, the chlorine contained in the RDF reacts with an aromatic compound in the combustion process to cause dioxin or furan. There is a problem that such dioxins are generated.

As a means for solving this problem,
Various combustion management and air blowing methods have been proposed as prior art. However, in combustion in a fluidized bed incinerator, the properties of RDF to be charged and the R
The combustion state constantly fluctuates depending on how the DF is charged, and it is difficult to suppress harmful gases such as dioxins by a certain operation method. In addition, especially when combusting RDF containing a large amount of chlorine, there is a limit to the suppression of dioxin reduction by combustion management, and it is necessary to grasp the operation status by some index and perform control based on the result. is there.

The present invention has been made in order to solve the above-mentioned problems, and in the treatment of RDF in an incinerator, the combustion state in the furnace is maintained constant by introducing a relatively simple apparatus. Accordingly, there is provided a method and an apparatus for treating RDF in an incinerator which suppresses emission of harmful gas and unburned gas and efficiently reduces dioxins.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies on the efficient suppression of dioxins in the treatment of RDF in an incinerator and have obtained the following findings.

That is, dioxins can be suppressed by co-firing RDF with a sulfur component-containing material in an incinerator. Further, as an index for judging the combustion state in the furnace, the in-furnace, furnace outlet or chimney stack By maintaining the SO _X concentration within a predetermined range, the generation of dioxins can be efficiently suppressed.

The present invention has been made based on such knowledge, and is characterized by having the following configuration.

That is, the present invention relates to a method for treating RDF, in which a sulfur component-containing material and RDF are co-fired in an incinerator,
The SO _X concentration in the furnace, at the furnace outlet or in the chimney is measured, and based on the measured value, the sulfur component content and / or RD is measured.
An RDF processing method characterized by controlling the supply amount of F is provided.

[0010] In the present invention, the incinerator is preferably a fluidized bed furnace, and the SO _X
It is preferable to control the supply amount of the sulfur component-containing material and / or waste so that the concentration becomes 50 to 400 ppm.

The present invention is also an RDF processing apparatus for co-firing a sulfur-containing material and RDF in an incinerator, comprising: a sulfur-containing material supply device; an RDF supply device;
RDF, wherein the SO _X concentration meter for measuring the SO _X concentration in the reactor outlet or chimney, further comprising a controller for controlling the supply amount of the sulfur compound-containing and / or RDF based on the measurement value Of the present invention.

In the apparatus of the present invention, it is preferable that the incinerator is a fluidized-bed furnace, and that the
As O _X concentration of 50 to 400 ppm, it is preferable to provide a control device for controlling the supply amount of the sulfur compound-containing and / or waste.

[0013]

In DETAILED DESCRIPTION OF THE INVENTION according to the present invention RDF processing techniques, and co-firing the RDF and sulfur compound-containing by incinerators, further furnace at this time, the furnace outlet or chimney SO _X
By monitoring the concentration, dioxins can be effectively reduced.

[0014] The sulfur content is H ₂ S, CS during the combustion process.
₂ , COS, SO ₂ , SO ₃ present in the furnace. These substances have a poisoning effect on copper or a similar substance serving as a catalyst for the production of dioxins, and can effectively suppress dioxins in an exhaust gas line from a high temperature combustion field in the furnace to an exhaust gas line after the furnace outlet. In addition, some substances suppress the reaction of Cl to produce dioxins during the process of producing dioxins. As a result, the production of dioxins in the combustion process and in the subsequent stream is suppressed.

Further, SO _X concentration in the furnace, the furnace outlet or chimney, a measure such as a combustion reaction in the furnace. Furthermore, S
Since O _X concentration of most minute generated from the sulfur compound-containing in, also a measure of the input amount of the sulfur component content. In other words, it is a measure of how much the sulfur component-containing substance is added to the RDF and how much combustion is being performed in the furnace. That is, this is a standard for efficiently performing the above-described reaction contributing to the reduction of dioxins.

[0016] In order to achieve this, the furnace, the furnace outlet or chimney need only install the SO _X concentration meter, when the incinerator automatic operation need only incorporate the parameters of the driver that value. No major remodeling is required and it can be realized relatively inexpensively.

Hereinafter, this will be described in more detail with reference to FIG.

FIG. 1 shows an example of an apparatus for treating waste according to the present invention. This treatment device includes a fluidized bed incinerator 1, an RDF supply device 2, and a sulfur component-containing material supply device 3. An exhaust gas treatment device 10 is connected to the incinerator 1, and a chimney 12 is connected to the exhaust gas treatment device 10. Are connected. And the chimney 1
An SO _X concentration meter 7 is attached to 2, and a concentration detection signal from the concentration meter 7 is input to a control device or an instrument 8.

Next, the RDF and the sulfur content contained in the incinerator 1 from the supply units 2 and 3 in FIG. 1 are fluidized by a fluidizing gas (eg, air) sent from below the dispersion plate 4. It comes into contact with the sand layer, which is dried and heated to ignite. The ignited sulfur component content and RDF are burned in the furnace 1. Exhaust gas is discharged from the furnace outlet 6 through the exhaust gas treatment facility 10 to the chimney 12.

In FIG. 1, the RD is set so that the measured value of the SO _X concentration meter 7 attached to the chimney 12 is within a predetermined range.
F and / or waste input is determined. That is,
Density detection signal from the SO _X concentration meter 7 to the control device or instrument 8 is connected to the SO _X concentration meter 7 attached to the chimney 12 is inputted, the range SO _X concentration in the chimney on the basis of the measured value of a predetermined The input amount of the RDF and / or sulfur component-containing material is determined so as to fall within the range. When the SO _X concentration is low, the input amount of the sulfur component-containing material is increased and / or the input amount of the RDF is reduced, while when the SO _X concentration is high, the input amount of the sulfur component-containing material is reduced and / or Or RDF
Increase the input amount.

[0021] Incidentally, as shown in FIG. 1, by such white smoke preventing air from the chimney upstream is joined to the exhaust gas, in the case that affect SO _X concentration in the chimney, for example, oxygen 12% conversion The concentration may be taken into account by using Also, if you are automatic control, it may be added to the value of the SO _X concentration in the operating parameters.

In the present invention, the preferred SO in the chimney
_X concentration is 50 to 400 ppm. SO in the chimney
_{If the X} concentration is less than 50 ppm, the above-described reaction with sulfur cannot be efficiently performed, and if the _X concentration exceeds 400 ppm, the possibility of wake corrosion due to sulfur oxides in the exhaust gas increases.

In the present invention, the SO _X concentration meter is installed in the furnace or at the furnace outlet, and the SO _X concentration in the furnace or at the furnace outlet is within a predetermined range, preferably 60 to 60 in any case.
It is also possible to control the supply amount of the RDF and / or sulfur component-containing material so as to be 0 ppm, and in this case, the same effect as described above can be obtained.

Further, the incinerator in the present invention is not particularly limited, but a fluidized bed incinerator which burns the combustion product while flowing the combustion product is preferable in order to improve the combustibility of the sulfur component-containing material.

[0025]

As described above, according to the present invention, in the treatment of solid waste in an incinerator, it is possible to determine the input ratio of the sulfur component-containing material and the RDF for realizing stable combustion conditions, and the efficiency is improved. It has become possible to suppress the production of dioxins. In addition, it does not require a large amount of remodeling, and can be realized relatively inexpensively.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a typical example of a conventional fluidized bed furnace.

[Explanation of symbols]

1, 21: fluidized bed incinerator, 2, 22: RDF supply device (RDF injection machine), 3: sulfur component content supply device, 4,
24: dispersion plate, 5, 25: wind box, 6, 26: furnace outlet, 7
... SO _X concentration meter, 8 ... Control device or instrument, 10, 30 ...
Exhaust gas treatment device, 12, 32 ... chimney

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiji Kinoshita 1-1-2 Marunouchi, Chiyoda-ku, Tokyo, Japan Inside the Nihon Kokan Co., Ltd. (72) Inventor Hajime Akiyama 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan F-term in Honko Tube Co., Ltd. (Reference) 3K062 AA11 AB02 AC01 BA02 BB04 CA05 CB03 CB08 DA26 DB01 DB30

Claims (4)

[Claims] 1. A method for treating refuse solid fuel in which a sulfur component-containing material and refuse solid fuel are co-fired in an incinerator, comprising:
A method for treating refuse solid fuel, comprising: measuring SO _X concentration at a furnace outlet or a chimney; and controlling a supply amount of the sulfur-containing material and / or refuse solid fuel based on the measured value. 2. The method for treating refuse solid fuel according to claim 1, wherein the incinerator is a fluidized bed furnace, and the sulfur component-containing material and the SOx concentration are adjusted so that the SO _X concentration in the chimney is 50 to 400 ppm. And / or controlling the supply amount of solid waste fuel. 3. A waste solid fuel processing apparatus for co-firing a sulfur component-containing material and refuse solid fuel in an incinerator, wherein the sulfur component-containing material supply device, the refuse solid fuel supply device, S for measuring SO _X concentration at furnace outlet or chimney
O _X concentration and meter, the said sulfur compound-containing based on the measurement values and / or processing device of waste solid fuel, characterized in that a control device for controlling the supply quantity of refuse fuel. 4. The refuse solid fuel processing device according to claim 3, wherein the incinerator is a fluidized bed furnace, and the control device controls the chimney so that the SO _X concentration is 50 to 400 ppm. A waste solid fuel processing apparatus, characterized in that a supply amount of a sulfur component content and / or a solid waste fuel is controlled.