JP3005122B2 - Corrosive substance combustion furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace for burning a corrosive substance, and its object is to form a furnace wall material of a furnace from a corrosion-resistant material even when a substance generating corrosive gas is burned. It is an object of the present invention to provide a combustion furnace having a corrosive substance, which can be made a sufficiently durable combustion furnace without any difficulty, and which is extremely easy to assemble, manufacture and maintain during operation.

[0002]

BACKGROUND OF THE INVENTION By-products in chemical processes, corrosive solids, liquids or gaseous substances of industrial waste, and substances that emit corrosive gases during incineration, etc. If the oxides and decomposition gases are not highly corrosive, but the oxides and decomposition gases are strongly corrosive, the combustion furnace for treating the waste had to be constructed using fire-resistant and corrosion-resistant furnace wall materials. . However, since the wall materials of these fluid combustion furnaces are usually ceramics such as refractory bricks, it is extremely complicated to manufacture, disassemble, or perform maintenance and maintenance of the combustion furnace when it is heavy. However, even these ceramics such as refractory bricks can corrode, and therefore, combustion furnaces made of general-purpose materials such as metal are not suitable for corrosive gases, corrosive liquids and corrosive solids, The gas itself is a highly corrosive gas, such as the combustion gas of waste, the combustion gas obtained by burning waste liquid or solid in a furnace,
Even if it is not so corrosive in itself, it did not exist as a material combustion furnace for treating such waste materials when its oxides and oxides of decomposition gases have strong corrosiveness.

[0003]

Therefore, the present inventor has already disclosed a corrosive substance combustion furnace which is durable without forming the furnace wall material of the combustion furnace from a corrosion-resistant material (Japanese Patent Publication No. 4-32331).
3). This corrosive substance combustion furnace will be described with reference to FIG. This corrosive substance combustion furnace is a corrosive substance combustion furnace (B)
The body (A) has a corrosive substance supply port (C) for supplying a corrosive substance, a burner (D) formed around the corrosive substance supply port (C), and a burner (D). A combustion air supply port (E) for supplying air is formed, an external cooling mechanism is formed between the wall (H) between the combustion chamber inner wall (F) and the outer wall (G), and the entire periphery of the upper portion of the inner wall (F). A fluid film forming apparatus (I) for forming a fluid film on the entire inner wall (F) is formed, and a wet gas cooler (J) for the combustion gas is continuously provided on the main body (A). Was.

[0004]

The above-mentioned corrosive substance combustion furnace is capable of burning a fluid such as a corrosive gas, especially a gas or liquid before combustion, even if the gas after combustion is strongly corrosive. Even if the furnace wall material is made of general-purpose materials without having to be made of a special corrosion-resistant material, it can be made a sufficiently durable combustion furnace, making it easy to assemble, manufacture and maintain during operation. This is an excellent invention that can be performed, but has the following problems. When corrosive solid substances are burned in this corrosive substance combustion furnace, these corrosive solid substances often contain heavy metals and the like, and there are problems such as treatment of ash and treatment of ash contained in gas generated from solid matter. In many cases, the corrosive solid substance could not be directly burned using this corrosive substance combustion furnace. Further, the high temperature of the combustion gas may damage the fluid film forming device installed on the upper part of the combustion furnace. Also, Japanese Patent Application Laid-Open No. 61-173020
Japanese Patent Application Laid-Open No. 3-99112 and Japanese Patent Application Laid-Open No. 3-99112 disclose a combustion furnace having a combustion gas cooling mechanism, and Japanese Patent Application Laid-Open No. 48-367 discloses a technique in which liquid used in the combustion furnace is circulated by a circulation mechanism having a filter. It has been disclosed. However, all of the above-described prior art combustion furnaces can collect residues remaining as ash in the combustion furnace, but cannot recover ash contained in the combustion gas, and therefore may contain harmful substances such as heavy metals. When a large amount of corrosive solid substances are burned, harmful substances contained in the gas are released into the air, which is not preferable for environmental health.
In addition, there is a problem that the dust collector is broken by the corrosive gas simply by connecting the existing dust collector.

In view of the above circumstances, the inventor of the present invention does not disperse these harmful substances to the outside even if they generate a corrosive gas and contain solids containing heavy metals. The intense research has been continued on a corrosive substance combustion furnace which can be made a sufficiently durable combustion furnace without being formed from corrosive materials and which is extremely easy to assemble, manufacture and maintain during operation.

[0006]

That is, according to the present invention, a liquid film forming apparatus for forming a liquid film over the entire inner wall is formed all around the upper part of the inside of a combustion furnace main body, and an exhaust gas for discharging a combustion gas is formed near the liquid film forming apparatus. A port is provided, a supply port for supplying a corrosive substance at a lower portion of the combustion furnace, a combustion section provided with a grate for burning corrosive solids, and an air supply port for sending air to the combustion section. And an ash outlet for taking out ash are provided, and a liquid storage portion for storing the liquid flowing out of the liquid film forming device is formed in the lower inner periphery, and between the liquid storage portion and the grate. Is provided with an air gap, and an external cooling mechanism is formed between an inner wall and an outer wall provided from a ceiling portion to a lowermost portion of the combustion furnace main body. Gas cooling to eject liquid into the combustion gas just below A mechanism is provided, and the liquid storage unit and the liquid film forming apparatus are connected and connected by a circulation mechanism including a filter that filters the liquid through a pump and a cooler that cools the liquid, The circulation path of the circulation mechanism is provided with a neutralizing liquid replenishing unit, and the exhaust port is connected to a dust collection mechanism via an exhaust fan, and the dust collection mechanism has a cooling mechanism for ejecting liquid, and a cooling mechanism for ejecting the liquid. The cooling mechanism and the liquid storage section are connected to each other by a circulation mechanism having a cooler for cooling the fluid through a pump and a neutralizing liquid supply section. By providing a corrosive substance combustion furnace characterized by the above, all of the conventional disadvantages have been solved.

[0007]

A corrosive substance is supplied from a supply port onto a grate of a combustion portion of a combustion furnace main body made of a normal corrosion-resistant metal, for example, a metal such as stainless steel, and is burned. Combustion air is suction-supplied from an air supply port provided at a lower portion of the combustion furnace main body by a combustion suction force of a corrosive substance or an exhaust fan. When the liquid flows between the inner wall and the outer wall, the temperature of the inner wall and the outer wall is prevented from rising due to the burning of the corrosive substance, and the action of the film by the liquid film forming apparatus provided around the entire upper portion of the inner wall is protected. The cooling liquid is supplied from the liquid film forming apparatus to form a liquid film on the entire inner wall, thereby increasing the action of the liquid between the walls. The fluid stored in the liquid storage unit is filtered by a filter via a pump, and the filtered fluid is cooled by a cooler, neutralized by a neutralizing liquid supply unit, and then circulated to the liquid film forming apparatus.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings for combustion of solids. FIG. 1 is a partial sectional explanatory view of a corrosive solid substance combustion furnace according to one embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of the combustion furnace shown in FIG.

In FIG. 1, (1) is a corrosive substance combustion furnace main body. This combustion furnace main body (1) is a general-purpose material such as corrosion-resistant metal such as stainless steel, polymer material such as FRP, heat-resistant glass, etc. Of inorganic materials. (8a) is a cooling mechanism for ejecting liquid, and this cooling mechanism (8a) is provided in the upper hollow portion of the combustion furnace main body (1). This liquid is preferably ejected in the form of a mist. This cooling mechanism (8
A transmission pipe (9) extending outside the combustion furnace main body (1) is connected to a), and liquid is supplied from the tip (10) of the cooling mechanism (8a) via the transmission pipe (9). To cool the combustion gas generated in the combustion furnace main body (1).

Further, the furnace wall of the combustion furnace (1) is formed as a double wall composed of an inner wall (2) and an outer wall (3), and a space (4) between the inner wall (2) and the outer wall (3) is formed. ) The cooling liquid (5)
The cooling passage can be further cooled by adopting the flow passage of. In the illustrated embodiment, this mechanism is an external cooling mechanism, and the cooling liquid (5) is preferably an arbitrary liquid such as a refrigerant, water, or oil. The external cooling mechanism is not limited to a liquid, but may be a cooling mechanism using air.

An exhaust port (11) for exhausting combustion gas is provided above the point (10) of the cooling mechanism (8a). (6) is a liquid film forming device, which is provided around the entire upper portion of the inner wall (2) of the combustion furnace main body (1) and flows out from the liquid film forming device (6). Liquid is coated on the inner wall (2) over the entire surface (7).
To form A supply port (12) for supplying a corrosive solid substance is provided at a lower portion of the combustion furnace body (1), and a combustion section for burning the corrosive solid substance supplied from the supply port (12) on a grate (24). (13) and an air supply port (14) for sending air to the combustion section (13). When burning a liquid or gaseous body, a burner is provided instead of the grate (24). As shown in FIG. 2, the combustion part (13) is provided with an ash outlet (15) for taking out ash generated when the solid matter is burned. If this ash contains heavy metals, it is buried in concrete for treatment. Further, the liquid flowing out of the liquid film forming apparatus (6) and the cooling mechanism (8) are provided all around the lower inner portion of the combustion furnace body (1).
A liquid storage section (16) for storing the liquid ejected from the tip (10) of (a) is provided. This liquid may be used as a neutralizing liquid depending on the type of gas generated.

A filter (18) for filtering solids such as ash and dust in the liquid through a pump (17a) through the liquid reservoir (16) and the liquid film forming device (6), A circulation mechanism (20a) including a cooler (19a) for cooling
And the liquid is preferably circulated by the circulation mechanism (20a).

An exhaust pipe (2) is connected to the exhaust port (11).
It is preferable that the dust collecting mechanism (21) is connected and connected through 2).
An exhaust fan (not shown) is interposed in the exhaust pipe (22). A cooling mechanism (8b) for ejecting liquid is provided in an upper hollow portion of the dust collecting mechanism (21), and a liquid storage part (26) for storing the liquid ejected from the cooling mechanism (8b) in the dust collecting mechanism (21). Is provided. This liquid may be used as a neutralizing liquid depending on the type of gas. This reservoir (2
6) and the cooling mechanism (8b) are connected by a circulation mechanism (20b) including a cooler (19b) for cooling the liquid via a pump (17b). Circulate liquid. When ash containing heavy metals is contained in the circulation mechanism (20b) via the flue, heavy metals are removed by ion exchange treatment. The removed heavy metals are buried in concrete and disposed of. An external exhaust port (23) is provided in the vicinity of the cooling mechanism (8b) provided in the hollow above the dust collecting mechanism (21). In addition, the said exhaust fan may be provided in the part of an external exhaust port (23).

Next, an embodiment of the use state of the corrosive substance combustion furnace will be described. First, a corrosive solid substance is supplied onto a grate (24) of a combustion section (13) from a supply port (12) provided at a lower portion of the combustion furnace body (1), and the air supply port (1) is supplied.
Burn the corrosive solid substance while supplying air from 4). The corrosive solid matter that has turned into ash by the combustion accumulates below the grate (24), and the combustion gas generated by the combustion is cooled by the cooling mechanism (8a) and then exhausted by the exhaust pipe ( It is sucked into the dust collecting mechanism via 26). Also, the inner wall (2) of the combustion furnace body (1)
The liquid of the liquid film (7) formed to protect the liquid from heat and corrosive gas is stored in the liquid storage part (16) and sent to the filter (18) via the pump (17a) to be filtered. After being filtered by the cooler (18), the cooler (1)
Cooled in 9a). The cooled liquid is subjected to a neutralizing treatment by a neutralizing liquid replenishing section (25a). For example, when a vinyl chloride plastic is burned, an acidic hydrochloric acid gas is generated. I do. The neutralized liquid flows out again through the liquid film forming device (6). The corrosive gas contained in the combustion gas sucked into the dust collecting mechanism (21) is stored in the liquid storage section (26) together with the liquid ejected from the cooling mechanism (8b).
The liquid stored in the liquid storage section (26) is pumped (17).
Through the cooler (19b) through b). The cooled liquid is neutralized by the neutralizing liquid replenishing section (25b) and then jetted again through the cooling mechanism (8b). On the other hand, the combustion gas is exhausted to the outside through the external exhaust port (23) after removing harmful components.

As described above, even when a solid material that emits corrosive gas is burned, a combustion furnace having sufficient durability can be obtained without forming the furnace wall material of the combustion furnace from a corrosion-resistant material. Can be.

[0016]

As described above in detail, according to the present invention, a liquid film forming apparatus for forming a liquid film over the entire inner wall is formed all around the upper part of the inside of the combustion furnace main body, and exhaust gas for discharging combustion gas is formed in the vicinity of the liquid film forming apparatus. A port is provided, a supply port for supplying a corrosive substance at a lower portion of the combustion furnace, a combustion section provided with a grate for burning corrosive solids, and an air supply port for sending air to the combustion section. And an ash outlet for taking out ash are provided, and a liquid storage portion for storing the liquid flowing out of the liquid film forming device is formed in the lower inner periphery, and between the liquid storage portion and the grate. Is provided with an air gap, and an external cooling mechanism is formed between an inner wall and an outer wall provided from a ceiling portion to a lowermost portion of the combustion furnace main body. Gas cooling to eject liquid into the combustion gas just below The liquid storage unit and the liquid film forming apparatus are connected to each other by a circulating mechanism including a filter that filters the liquid through a pump and a cooler that cools the liquid. The circulation path of the circulation mechanism is provided with a neutralizing liquid replenishing unit, and the exhaust port is connected to a dust collection mechanism via an exhaust fan, and the dust collection mechanism has a cooling mechanism for ejecting liquid, and a cooling mechanism for ejecting the liquid. The cooling mechanism and the liquid storage section are connected to each other by a circulation mechanism having a cooler for cooling the fluid through a pump and a neutralizing liquid supply section. Therefore, the following effects can be obtained. That is, even when burning a solid substance that emits corrosive gas, it is possible to obtain a sufficiently durable combustion furnace without forming the furnace wall material of the combustion furnace from a corrosion-resistant material. Maintenance during production and operation is extremely easy. In addition, since the external cooling mechanism is formed between the inner wall and the outer wall provided from the ceiling to the lowermost part of the combustion furnace main body, cooling by the external cooling mechanism can be performed over the entire inner wall of the combustion furnace. Thus, excellent heat resistance can be obtained over the entire inner wall. Further, since the combustion gas cooling mechanism is provided immediately below the liquid film forming device, damage to the liquid film forming device provided above the combustion furnace by the combustion gas can be prevented. In addition, the liquid storage unit and the liquid film forming apparatus are connected to each other by a circulation mechanism including a filter that filters the liquid through a pump and a cooler that cools the liquid, and supply the neutralizing liquid to the circulation path of the circulation mechanism. Since the portion is provided, the liquid film can be formed on the inner wall of the combustion furnace in a perfect state at all times without deteriorating the heat resistance and corrosion resistance of the liquid film at all. Furthermore, since the gap is provided between the liquid storage part and the grate, the high heat of the grate is less likely to be transmitted to the liquid storage part, and the wall cooling performance of the liquid film forming apparatus can be further improved.
In addition, at the lower part of the combustion furnace, a supply port for supplying a corrosive substance, a combustion section having a grate for burning corrosive solids, an air supply port for sending air to the combustion section, and taking out ash. Ash outlets are provided, so that corrosive solids containing heavy metals and the like can be burned on a grate, and harmful ash can be taken out of the ash outlet and processed. In addition, when burning corrosive solid substances that often contain harmful substances such as heavy metals, the residue remaining as ash can be collected in a combustion furnace, and the ash contained in the combustion gas can be collected in a dust collector, Does not release harmful components into the atmosphere. Further, since the dust collecting mechanism is also provided with a cooling mechanism for ejecting liquid and a circulation mechanism having a neutralizing liquid replenishing section, the dust collecting mechanism is not damaged by corrosive gas.

[Brief description of the drawings]

FIG. 1 is a partially sectional explanatory view of a corrosive substance combustion furnace according to one embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of a combustion unit shown in FIG.

FIG. 3 is a partially sectional explanatory view of a conventional corrosive substance combustion furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion furnace main body 2 Inner wall 3 Outer wall 4 Between walls 6 Liquid film forming device 7 Liquid film 8a, 8b Cooling mechanism 11 Exhaust port 13 Burning unit 16 Liquid storage unit 17a, 17b Pump 18 Filter device 19a, 19b Cooler 20a, 20b Circulation Mechanism 21 Dust collection mechanism 25a, 25b Neutralizing liquid supply section 26 Liquid storage section

Continuation of the front page (56) References JP-A-4-32313 (JP, A) JP-A-61-173020 (JP, A) JP-A-3-99112 (JP, A) JP-A-55-121318 (JP, A) JP-A-54-139878 (JP, A) JP-A-48-367 (JP, A) JP-A-55-121318 (JP, A) JP-A-61-128021 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F23G 5/00 B

Claims (1)

(57) [Claims] 1. A liquid film forming apparatus for forming a liquid film on the entire inner wall is formed all around the upper part of the inside of a combustion furnace body, and an exhaust port for discharging combustion gas is provided in the vicinity of the liquid film forming apparatus. Is a supply port for supplying corrosive substances,
A combustion part provided with a grate for burning volatile solids,
An air supply port for sending air to the combustion section and ash
Provided the height outlet of Sutame, reservoir is of forming the inner periphery lower Earn liquid flowing out of the liquid film forming apparatus
A gap is provided between the liquid storage part and the grate.
From the ceiling to the bottom of the combustion furnace body.
An external cooling mechanism is formed between the inner wall and the outer wall, and a combustion gas cooling mechanism for ejecting liquid into the combustion gas is provided immediately below the liquid film forming apparatus above the combustion furnace. The liquid storage unit and the liquid film forming apparatus are connected to each other by a circulation mechanism including a filter that filters the liquid through a pump and a cooler that cools the liquid, and the circulation mechanism is provided. The circulation path is provided with a neutralizing liquid replenishing unit, the exhaust port is connected to a dust collecting mechanism via an exhaust fan, and the dust collecting mechanism has a cooling mechanism for ejecting liquid,
A liquid storage unit for storing the jetted liquid is provided,
A corrosive substance combustion furnace, wherein the cooling mechanism and the liquid storage part are connected to each other by a circulation mechanism having a cooler for cooling a fluid through a pump and a neutralizing liquid supply part.