JP2003227605A - Incineration method for material to be disposed and incineration apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more directly and efficiently use energy generated by combustion of a waste liquid W and use the energy for multi-purpose. <P>SOLUTION: This incineration apparatus includes a combustion furnace 1 having an outer wall 5 of a jacket structure, to which the waste liquid W is supplied to be burnt, and a cooling means 6 for circulating the cooling water C in the jacket of the combustion furnace to perform cooling. The cooling means 6 is provided with a head tank 7 for holding the cooling water C circulated between the tank and the combustion furnace 1, and a boiler 11 is connected to the head tank 7, thereby supplying the heated cooling water C returned from the combustion furnace 1 as a boiler supply water B to the boiler 11. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for incinerating a treated material for burning and detoxifying a treated material such as a waste liquid which cannot be discharged as it is because it contains an organic substance or a harmful substance. And an incinerator.

[0002]

2. Description of the Related Art For example, liquid wastes, that is, waste liquids, are mostly water and the rest are organic substances and inorganic substances, and are generated in all industrial fields including the petrochemical industry and in the civilian field. For example, a waste liquid that cannot be released out of the system as it is because it contains an organic substance or a harmful substance must be detoxified. And, as one means of such a detoxification treatment, there is a high temperature oxidation treatment by spraying the waste liquid in a combustion furnace and burning it at a high temperature, that is, an incineration treatment, which is widely used because a large amount of waste liquid can be treated. There is.

Here, the inventors of the present invention circulate a heat medium such as dibenzyltoluene or polymer oil in the outer wall portion of the combustion furnace as a combustion method for burning and treating the waste liquid in this way. Therefore, it is proposed to extend the life of the refractory material lined on the inner wall of the combustion furnace by controlling the temperature and the surface temperature inside the furnace. That is, in this combustion method, the outer wall portion of the combustion furnace has a jacket structure so that the heat medium as described above can be supplied, and the surface temperature of the inner wall of the furnace is controlled by controlling the temperature of the heat medium. Cooling to an appropriate range coats the molten molten salt derived from the alkali content of the waste liquid on the surface of the refractory lining on the inner wall of the furnace to form a self-protecting film, preventing the corrosion of this refractory. We are trying to extend its life.

[0004]

By the way, the heat medium thus supplied to the combustion furnace is heated by itself and burns instead of cooling the refractory material on the inner wall of the furnace and controlling the surface temperature thereof as described above. It is returned from the furnace, cooled in the middle of its circulation path and returned to the combustion furnace again, but since the temperature of the heat medium returned from the combustion furnace is high, its energy is recovered and used effectively. Is important. However, in the above-mentioned conventional combustion method, since the heat medium itself is a compound such as dibenzyltoluene or polymer oil as described above, it is extracted from the system of the combustion apparatus and the energy is used. Is difficult,
There is no choice but to limit the usage, and for example, the high-temperature heat medium returned from the combustion furnace is
Heating for evaporating and concentrating the waste liquid supplied to the combustion furnace by evaporating and concentrating it in the middle of the circulation path, or by extracting a part of it and exchanging heat with the cooling water. It was only used as a source.

The present invention has been made under such a background, and in burning and incinerating a treated material such as the above-mentioned waste liquid, the energy generated by the combustion can be more directly and efficiently. Moreover, it is an object of the present invention to provide an incineration treatment method and an incineration treatment device of a treated material that can be used for multiple purposes.

[0006]

In order to solve the above-mentioned problems and to achieve such an object, the incineration method of the present invention supplies an object to be burned to a combustion furnace and burns it. It is characterized in that cooling water is passed through the outer wall of the combustion furnace to cool the combustion furnace, and the cooled cooling water is supplied to the boiler as boiler supply water. Also,
The incineration treatment apparatus of the present invention has a combustion furnace in which the outer wall has a jacket structure, the material to be treated is supplied and burned, and cooling means for circulating cooling water in the jacket of the combustion furnace to cool the jacket. The cooling means is provided with a head tank that holds the cooling water that is circulated between the combustion furnace, and a boiler is connected to the head tank, and the head tank is returned from the combustion furnace and heated. It is characterized in that cooling water can be supplied to the boiler as boiler feed water.

Therefore, in the incinerator having such a structure, the cooling water circulated between the combustion furnace and the head tank by the cooling means is not the cooling water for the inner wall of the furnace in the combustion furnace but the product itself. It is heated by combustion energy and returned to the head tank, so by connecting a boiler to this head tank and supplying heated cooling water as boiler feed water, steam is generated with less fuel in this boiler. be able to. The steam thus generated in the boiler can be used as a heating source for evaporating and concentrating the waste liquid in the system as in the conventional combustion apparatus, as a matter of course, as a power source of a generator inside or outside the system. It can be directly used for a very wide range of applications such as heat sources for dryers and dryers, heat sources for outside heating and cooling equipment, and even when it is used as a heat source, it has a high heat transfer coefficient and therefore high heat exchange efficiency, and therefore combustion It is possible to effectively utilize the energy generated by the combustion of the processed material in the furnace.

Here, such an incineration method and an incineration apparatus can be applied to the case of incinerating general wastes, but as described above, the conventional method is sufficiently efficient and efficient. It is particularly effective when applied to incineration treatment by burning waste liquid, which has not been used for versatile combustion energy. In the incinerator, the cooling means is connected with a cooling water replenishing means for replenishing the cooling water supplied to the boiler as boiler supply water,
The cooling water replenishing means is equipped with a water softener for supplying soft water as the replenishing cooling water, and by passing the soft water as the cooling water in the incineration method, the cooling means and the boiler are connected to each other. It is possible to prevent scales from adhering to the inside of pipes and jacket structures of combustion furnaces, and such scales prevent cooling of refractory materials on the inner walls of combustion furnaces and heating of cooling water, and blockages in pipes. It is possible to prevent such a situation and promote more efficient and smooth use of energy. The connection between the head tank and the boiler may be either direct connection or a system in which a hot water tank is installed between the head tank and the boiler.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of an incineration processing apparatus of the present invention in the case of incinerating waste liquid W by burning it as a treated material. The structure of this incineration processing apparatus will be described below. In addition, an embodiment of the incineration method of the processed product (waste liquid W) of the present invention using this apparatus will be described together. In the present embodiment, the combustion furnace 1 has a vertical cylindrical shape, and an auxiliary combustion burner 2 is provided at the center of the top of the combustion furnace 1. From the auxiliary combustion burner 2, auxiliary fuel F such as kerosene is directed downward by the combustion air. 1 is burned by being injected into 1 and this auxiliary burner 2
A plurality of nozzles 3 for spraying the waste liquid W into the combustion furnace 1 (however, only one is shown in FIG. 1) ... Further, the waste liquid W is provided obliquely downward toward the center line of the combustion furnace 1 having a cylindrical shape, and the waste liquid W sprayed from the nozzles 3 into the combustion furnace 1 burns the auxiliary fuel F of the auxiliary burner 2. Burned by. Further, the exhaust gas generated by this combustion is discharged from the lower part of the combustion furnace 1, the alkali in the exhaust gas is dissolved by the alkaline liquid, and further cooled in a cooling tower (not shown), after which exhaust gas treatment such as dust removal is performed. Is discharged. Further, the alkali liquid in which the alkali in the exhaust gas is dissolved is collected in the tank 4 provided in the lower part of the combustion furnace 1 and partly circulated to dissolve the alkali in the exhaust gas and cool the exhaust gas in the cooling tower. Used,
The rest is discharged outside the system.

The inner wall portion of the combustion furnace 1 is lined with a refractory material, while the outer wall 5 portion in contact with the refractory material has a double-walled jacket structure so that the lower portion of the combustion furnace 1 is provided inside. From the top to the top,
Cooling water C, that is, water is supplied to this space by a cooling means 6 provided outside the combustion furnace 1, and the water is passed therethrough, and can be circulated between the cooling means 6 and the cooling means 6. The cooling means 6 is the cooling water C supplied to the jacket of the outer wall 5.
Head tank 7 that holds cooling water C that is provided at a position higher than the liquid surface level of C and that is circulated between it and the combustion furnace 1.
And a pump 8 for supplying cooling water C from the head tank 7 to the combustion furnace 1. The cooling water C held in the head tank 7 is a jacket formed by the outer wall 5 of the combustion furnace 1 by the pump 8. Instead of being circulated in the space of the structure and cooling the refractory on the inner wall, it is heated and returned to the head tank 7 for circulation.

In this embodiment, the cooling means 6
A boiler 11 is connected to the head tank 7 of the combustion tank 1 through a water supply tank 9 and a pump 10, and one of the cooling water C returned from the combustion furnace 1 and heated instead of cooling the refractory material of the combustion furnace 1 Part can be supplied to the boiler 11 as the boiler feed water B. Therefore, the boiler supply water B thus supplied to the boiler 11 is further heated in the boiler 11 to become steam S, and this steam S is supplied to the user according to the use application and the power of the various devices 12 is supplied. It is used as a heat source or heat source. The temperature of the boiler feed water B supplied from the head tank 7 to the boiler 11 is preferably about 60 to 250 ° C., and the pressure of the steam S generated by the boiler 11 is about 0.1 to 6.0 MPa. Is 10
About 0 to 450 ° C is desirable.

Further, the steam S thus supplied to the user and used as a heat source or a power source for the various devices 12
The condensed water H is collected in the condensed water tank 13 and returned to the downstream side of the head tank 7 of the cooling means 6 by the pump 14. A source water tank 15 for holding a source water L of the cooling water C is connected to the condensate tank 13 so that the source water L can be appropriately supplied by a pump 16 and is supplied to the boiler 11 as boiler supply water B. The shortage of the supplied cooling water C and the shortage of the steam S lost due to the flushing of the device 12 by the user are replenished, and the condensate tank 13 and the source water tank 1 are supplied.
5, and the pumps 14 and 16 form a replenishing means 17 for the cooling water C. Furthermore, this replenishing means 1
A water softener 18 is interposed between the condensate tank 13 of No. 7 and the source water tank 15, and the source water L is supplied to the condensate tank 13 as soft water having a hardness of about 1 to 2. Therefore, the cooling water C that circulates between the combustion furnace 1 and the head tank 7 of the cooling means 6, the boiler supply water B that is supplied from this head tank 7 to the boiler 11, and the various equipment of the user from this boiler 11 12, condensate tank 1
Such soft water is also circulated as the steam S and the condensate H that circulate again to the cooling means 6 via 3.

In the incinerator of the waste liquid W and the method for incinerating the waste liquid W using the device, the outer wall 5 of the combustion furnace 1 to which the waste liquid W is supplied and burned is burned. Since the cooling water C is passed through to cool the combustion furnace 1, the erosion of the refractory on the inner wall of the combustion furnace 1 can be suppressed, and the heated cooling water C after cooling the combustion furnace 1 Boiler feed water B to Boiler 11
In other words, the boiler supply water B is preheated by being passed as the cooling water C in the combustion furnace 1 and is supplied to the boiler 11. Therefore, this fuel can be supplied efficiently and economically with less fuel. The steam S can be generated in the boiler 11, so that not only the energy recovered from the combustion furnace 1 is used in the system of the incineration treatment apparatus, but also to users 12 of various applications outside the system. It becomes possible to use. For example, if a steam turbine is installed as the device 12, the steam S can be used as a power source to generate electricity, and a dryer or cooling / heating equipment is installed as the device 12. Then, the steam S can be used as the heat source. Furthermore, more specifically, a steam pool, a tropical botanical garden with hot water, or the like is provided adjacent to a treatment facility for the waste liquid W equipped with the incineration treatment device, and the steam S is used as a heating source for the hot water. It is also possible. Of course, it can be used for evaporative concentration of the waste liquid W in the system of the incinerator as in the conventional case, or the steam S can be branched and supplied to the inside and outside of the system to be used in both of them. it can.

Moreover, since the steam S, ie, steam, generated in the boiler 11 is a gas, it has a large heat transfer coefficient. Therefore, even when the steam S is used as a heat source for various equipments 12 as described above, its heat exchange efficiency is high. It becomes possible to raise. Therefore, according to the incineration treatment device and the incineration treatment method of the waste liquid W having the above-described configuration, it is possible to use the energy generated by the combustion of the waste liquid W in the combustion furnace 1 more efficiently and moreover, for multiple purposes as described above. The consumption of fuel used for these purposes, that is, the consumption of fuel conventionally burned to obtain steam as a heat source or a driving source for these various devices 12 can be reduced, and It is also possible to contribute to the reduction of the amount of carbon dioxide gas generated when burning the fuel. By the way, depending on the size of the boiler 11 and the like, when a part of the heated cooling water C is supplied to the boiler 11 as the boiler supply water B having the above temperature,
It is possible to save 4 to 6% of the boiler fuel compared with the case where the boiler feed water at room temperature is supplied.

By the way, in the present embodiment, the waste liquid W, which is a liquid waste, is supplied to the combustion furnace 1 as a product to be incinerated and burned. It is also possible to apply to the incineration treatment of the waste of. However, in such an incinerator for municipal waste, it is usually designed to utilize high-temperature exhaust gas discharged from the combustion furnace to recover heat in a waste heat boiler to generate steam, and It is effective to apply the present invention to the incineration process of the above-described waste liquid W which does not have such a steam generating means. However, cooling water for cooling the combustion furnace may be supplied as boiler supply water for the waste heat boiler in the incineration processing apparatus for waste such as municipal waste, or as a heat source for the boiler 11 in the above embodiment. The exhaust gas discharged from the combustion furnace 1 may be used.

On the other hand, in the above embodiment, the source water tank 15 holding the source water L is connected to the condensate tank 13 holding the cooling water C circulated in the cooling means 6 via the water softener 18. The source water L is replenished as soft water so that the cooling water C circulates between the combustion furnace 1 and the head tank 7 of the cooling means 6 as described above and the head tank 7 to the boiler. Soft water is also circulated as the boiler supply water B supplied to the steam generator 11, and the steam S and the condensate water H that are circulated from the boiler 11 to the cooling means 6 again through the user's various devices 12 and the condensate tank 13. It will be. Therefore, it is possible to prevent the scale from adhering to each of the pipelines connecting these and particularly to the space in the jacket structure of the outer wall 5 of the combustion furnace 1 and the like, and the refractory on the inner wall of the combustion furnace 1 is prevented by the scale. It is possible to prevent the thermal conductivity in cooling of the cooling water and the heating of the cooling water C from being impaired and to prevent the pipe line from being clogged, and it is possible to promote more efficient and smooth use of energy. Although not shown in the drawings, a device such as a valve may be provided in the pipe line if necessary, and even in this case, according to each of the above-described embodiments, scale is attached to such a device. It is possible to prevent this from happening and to ensure smooth and stable operation.

[0017]

As described above, according to the present invention,
The energy generated when burning the processed material in the combustion furnace,
By supplying the cooling water of the cooling means for cooling the combustion furnace as the boiler feed water of the boiler to generate steam, directly as a power source or heat source for more versatile equipment regardless of the inside or outside of the system of the device, Moreover, since the boiler feed water is preheated, it can be used efficiently,
It is possible to contribute to the improvement of economic efficiency and the reduction of the amount of carbon dioxide gas by effectively utilizing such energy, and it is particularly effective when the waste liquid is incinerated as a treated material. Further, if soft water can be supplied as cooling water to be supplemented to the cooling means, it is possible to prevent scale from adhering to the jacket structure of the outer wall of the combustion furnace and the pipe line, thereby achieving more efficient and smooth energy use. You can

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an incineration processing device of the present invention.

[Explanation of symbols]

1 combustion furnace 6 Cooling means 7 head tank 11 boilers 12 equipment 13 Condensate tank 15 Source water tank 17 Cooling water replenishing means 18 water softener W waste liquid (processed material) F auxiliary fuel C cooling water S steam H condensate L source water

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F27D 1/12 F27D 1/12 A 17/00 101 17/00 101Z (72) Inventor Naohito Kikuchi Central Tokyo 2-17-15 Tsukushima Machinery Tsukishima Machinery Co., Ltd. (72) Inventor Naotake Yamada 2-17-15 Tsukishima Machinery Co., Ltd., Chuo-ku, Tokyo F-Term (Reference) 3K065 AA16 AB01 AC07 BA05 JA02 JA18 JA23 4D034 AA11 CA02 4K051 AA00 AB03 HA06 4K056 AA00 CA11 CA20 DA10 DA13 DA15

Claims (6)

[Claims] 1. The processed material is supplied to a combustion furnace for combustion and incineration, and cooling water is passed through the outer wall of the combustion furnace to cool the combustion furnace, and the cooled cooling water is heated after cooling. Is supplied to the boiler as boiler feed water. 2. The incineration method of the processed product according to claim 1, wherein a waste liquid is supplied to the combustion furnace as the processed product. 3. The incineration method of the treated product according to claim 1, wherein soft water is passed as the cooling water. 4. A combustion furnace having an outer wall having a jacket structure, in which a treated material is supplied and burned, and a cooling means for circulating cooling water in the jacket of the combustion furnace to cool the jacket. Is provided with a head tank that holds the cooling water that is circulated between the combustion furnace, and a boiler is connected to the head tank, and the cooling water that is heated by being returned from the combustion furnace is An incinerator for incinerating a treated object, which can be supplied to the boiler as boiler feed water. 5. The incinerator for incineration of a processed product according to claim 4, wherein a waste liquid can be supplied to the combustion furnace as the processed product. 6. The cooling means is connected to a cooling water replenishing means for replenishing the cooling water supplied to the boiler as the boiler supply water, and the cooling water replenishing means is replenished with cooling water. A water softener for supplying soft water as said is provided, and the incineration processing apparatus of the treated product according to claim 4 or 5, characterized in that the water softener is provided.