JPH11290642A - High temperature removing device for corrosive gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for removing corrosive gas such as gaseous chlorine included in exhaust gas of an incinerator under high temperature. SOLUTION: This removing device is provided with an incinerator 1 having a charging port 2 of a waste solid fuel and a smoke outlet 1a, a first pipe line 4 communicated with the smoke outlet 1a of the incinerator 1, a second pipe line 6, a third pipe line 7, and a discharge passage 10. A first catalyst filter layer 3 and a second catalyst filter layer 5 each having a lime based granulat material are respectively installed in the first pipe line 4 and the second pipe line 6. A plurality of first filters 3a are installed in the first catalyst filter layer 3, and a plurality of second filters 5a are installed in the second catalyst filter layer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for removing corrosive gas such as chlorine gas contained in exhaust gas from an incinerator at high temperature.

[0002]

In recent years, there has been a demand for effective use of energy. Incineration of industrial waste, general waste, or refuse solid fuel (RDF) produced from these wastes is required. It has been increasingly used as a thermal power source and a heat source. As a boiler for power generation using such wastes, a flue gas tube boiler and the like are widely used. Such a boiler includes an exhaust gas passage communicating with an incinerator, a boiler main body into which exhaust gas from the exhaust gas passage is introduced, a furnace tube, and a discharge passage, and a heat exchanger is provided in the boiler main body. Are provided, and the exhaust gas introduced from the exhaust gas channel flows through this group of smoke tubes. On the other hand, the boiler main body is filled with water, and when exhaust gas flows through the group of flue tubes, heat exchange is performed between the boiler and the water, and the boiler is converted into energy as high-temperature, high-pressure steam.

However, in such an apparatus for extracting heat from the exhaust gas of an incinerator by heat exchange, the group of smoke tubes through which the exhaust gas flows contains hydrogen chloride gas,
Since a large amount of chlorine-based gas such as chlorine gas and corrosive gas such as NOx and SOx are contained, the fire tube group rapidly undergoes thermal corrosion near a tube wall temperature of 320 ° C. For this reason, the temperature of the exhaust gas circulating must be reduced to some extent, which lowers the efficiency of heat exchange with the water in the boiler body, making it difficult to raise the steam conditions of the boiler to high temperatures and high pressures. There is a problem that the efficiency is low and the cost cannot be justified. For this reason, STB34
Thermal corrosion is suppressed by using a sprayed film of a nickel-based self-fluxing alloy formed on a steel material such as OE, or a special boiler device capable of reheating is used.

[0004] However, not only can such measures not completely prevent thermal corrosion, but also the boiler unit itself becomes very expensive. This was one of the reasons that it did not spread to facilities.

[0005] Therefore, it is conceivable to remove corrosive gas from the exhaust gas. However, a bag filter usually used for collecting chlorine gas or the like has a service temperature of 20%.
Since the temperature is about 0 ° C., it cannot be used around the incinerator where the temperature becomes high, and the pressure loss of exhaust gas is large. Further, when the exhaust gas temperature is lowered, not only the above-mentioned problem of the energy conversion efficiency being lowered but also the denitration efficiency is lowered. These problems are common to a boiler device in which a smoke tube circulates in water and a boiler device in which a water tube circulates in an exhaust gas flow path to exchange heat. Therefore, in order to spread waste power generation, it is necessary to remove corrosive gas from exhaust gas immediately after being discharged from an incinerator. Further, if the corrosive gas can be removed immediately after being discharged from the incinerator, the chlorine-based gas can be removed at a temperature higher than the synthesis and decomposition temperature of dioxin, so that suppression of dioxin generation can be expected.

[0006] The present invention has been made in view of these problems, and has as its object to provide an apparatus for removing corrosive gas at high temperature.

[0007]

Means for Solving the Problems As a result of intensive studies in view of the above-mentioned object, the present inventor has prepared a catalyst filter using lime-based granules, and has formed the catalyst filter into an exhaust gas passage of a refuse solid fuel incinerator. If the flue gas passes through this filter, it is possible to collect chlorine-based gas and the like as calcium chloride even under high temperature, and in this filter, the catalyst is a granulated material. Yes, it has a certain diameter, so even if it passes through this filter, there is little decrease in exhaust gas temperature and pressure loss.Thus, by passing this exhaust gas through a smoke tube such as a boiler, it can be used as a heat source for power generation with high efficiency. Found that it is possible. As the lime-based granulated product, not only quick lime but also calcium carbonate and slaked lime are kneaded with water glass to obtain a gel-like material, which is dried to a desired size while heating, and then granulated or pelletized. The granulated product obtained by granulating the particles is heated at a temperature of about 900 ° C. for calcium carbonate (CaCO 3) and about 550 to 650 ° C. for slaked lime (Ca (OH) 2). They were found to be transformed into quicklime (CaO) and to exhibit a good corrosive gas removing effect. Furthermore, the present inventor blends an organic material or the like which is further carbonized at a high temperature into the calcium carbonate or slaked lime and water glass as a porosifying agent, and removes the porosifying agent by heating, thereby making the material porous. It has been found that the surface area of a lime-based granulated product as a catalyst can be increased. The present invention has been made based on these.

That is, the high-temperature corrosive gas removing apparatus according to claim 1 of the present invention comprises an incinerator having a solid waste fuel inlet and a chimney, and a flow passage communicating with the chimney of the incinerator. And a catalyst filter having lime-based granules is provided in the flow path.

Further, in the apparatus for removing corrosive gas at a high temperature according to claim 2, in the apparatus according to claim 1, the lime-based granulated product is obtained by kneading calcium carbonate, water glass and baking soda, and heating and drying the mixture. It is a grain.

A high-temperature corrosive gas removing apparatus according to a third aspect of the present invention is the apparatus according to the first aspect, wherein the lime-based granulated substance is a granulated substance obtained by kneading slaked lime and water glass and heating and drying. It is.

According to a fourth aspect of the present invention, there is provided an apparatus for removing corrosive gas at a high temperature according to the second or third aspect, wherein the heating and drying are performed at a temperature of 550 to 1000 ° C.

Further, the high-temperature corrosive gas removing apparatus according to the fifth aspect of the present invention is the apparatus according to any one of the first to fourth aspects, further comprising a heat exchanger downstream of the catalyst filter in the flow path. Things.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a high-temperature corrosive gas removing apparatus according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 shows a high-temperature corrosive gas removing apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes a heat-resistant incinerator made of ceramic. A solid waste fuel stocker (not shown) is in communication with the incinerator 1, and a fixed amount of solid waste fuel is supplied to the incinerator 1. Reference numeral 3 denotes a first catalyst filter layer which communicates with the chimney 1a of the incinerator 1 through a first pipe line 4. In the first catalyst filter layer 3, a plurality of first filters 3a are provided. And the first
A second catalyst filter layer 5 is disposed downstream of the catalyst filter layer 3 through a second pipe 6, and a plurality of second filters 5 a are provided in the second catalyst filter layer 5. Are provided. Further, reference numeral 7 denotes a third pipe connected to the second catalyst filter layer 5, and the third pipe 7 is brought close to the above-mentioned first pipe 4 so as to be heated to a high temperature again by heat exchange. After being heated to a boiler 8 as a heat exchanger, it is fed as a smoke tube or the like. 10 is boiler 8
The discharge path 10 is connected to an external environment via a bag filter (not shown). Reference numeral 9 denotes a water pipe of the boiler 8. Further, in the present embodiment, the first conduit 4, the second conduit 6, the third conduit 7, and the discharge conduit 10 constitute a flow passage.

In the present invention, the solid waste fuel (RDF) is a fuel (Refus) selected from waste.
e Derived Fuel), which does not contain metal fragments, glass fragments, or other removable inorganic substances,
Waste that can be used as fuel as it is.Especially, garbage and combustible waste are crushed and dried to improve the calorific value and preservability. And improved transportability, preferably by adding slaked lime or quick lime before drying to prevent deodorization and generation of harmful gases.

In the apparatus as described above, the first catalyst filter layer 3 and the second catalyst filter layer 5 have lime-based granules as a catalyst. This lime-based granule is
Basically, it refers to quicklime granules, aggregates, limestone, etc., but in the present invention, it may be used as it is by crushing quicklime or limestone, or in the following two methods. Those obtained can also be used.

In the first method, calcium carbonate, water glass and baking soda are used. As the calcium carbonate used in the present invention, any of natural calcium carbonate and synthetic calcium carbonate can be used. As the natural calcium carbonate, shells, limestone, calcite, marble and the like can be used. The specific surface area and the like are not particularly limited. Further, the water glass used in the present invention is for mixing with the calcium carbonate to form a gel, and contributes to stabilization of heavy metals. Examples of the water glass include general-purpose water-soluble silicates such as sodium silicate and potassium silicate. Its molar ratio (SiO2
/ M2O: M is an alkali metal) can be arbitrarily selected in the range of ordinary commercial products, that is, in the range of 0.5 to 4.2. As such a water glass, sodium silicate is particularly preferable, and an aqueous solution having a concentration of about 2 to 30% is used, and if necessary, an equivalent to about 10 times the amount of water is added to the water glass to obtain calcium carbonate. Can be adjusted. However, if the concentration of the water glass is too low, it cannot be formed into granules. In addition, baking soda (sodium bicarbonate) is added. This baking soda is necessary to gel the mixture of calcium carbonate and water glass.

The mixing ratio of calcium carbonate, water glass, and sodium bicarbonate as described above is 5 to 20 parts by weight of water glass (in terms of a 10% aqueous solution) with respect to 100 parts by weight of calcium carbonate.
It is preferred to use parts by weight. If the amount of water glass is less than 5 parts by weight, it is difficult to form a gel with calcium carbonate. On the other hand, if the amount of water glass is more than 20 parts by weight, it takes a long time to dry. Further, the mixing ratio of baking soda is preferably about 1 to 5 parts by weight based on 100 parts by weight of calcium carbonate. If the amount of baking soda is less than 1 part by weight, it is difficult to form a gel with calcium carbonate. On the other hand, if it exceeds 5 parts by weight, it is not meaningful, but the gelation is too fast and granulation is difficult. Becomes

The gelled product composed of each component as described above becomes porous by evaporating the water content. In the present invention, further, a porous agent is further added to the above-described calcium carbonate, water glass and baking soda. Can be blended. This porous agent is a solid at normal temperature, but when heated to a predetermined temperature or higher, the volume is greatly reduced due to carbonization and vaporization to form voids, and the obtained calcium carbonate granules are porous. And organic powder, low boiling point solid, or the like can be used. Specifically, wastes such as wood meal, coffee, corn starch, and soybeans such as soybeans can be used. The mixing ratio of the above-mentioned porosity agent may be about 5 to 20 parts by weight based on 100 parts by weight of calcium carbonate.

In the first method, the above-mentioned calcium carbonate, water glass, and baking soda, and a porosifying agent added as needed are blended at a predetermined ratio, and the mixture is sufficiently kneaded to form a gel composition. By adjusting the product and heating and drying the gel composition, the calcium carbonate remains 2 to 2 as calcium carbonate.
Although it can be used as a removing agent as a granular material having a size of about 30 mm, it is preferably heated to about 900 ° C. and dried to transform calcium carbonate into quicklime and used as the removing agent. Alternatively, the gel composition may be formed into a stick by shaping the gel composition into a stick shape, cutting the gel composition, and then drying by heating. Further, depending on the viscosity of the gel composition, the gel composition may be dried as it is without molding, and may be pulverized lightly.

As a second method for producing lime-based granules, slaked lime and water glass are used. As the slaked lime used in the present invention, JIS special lime slaked lime, which is generally used, or other commercially available products can be used, and the specific surface area and the like are not particularly limited. Further, as the water glass used in the present invention, the same one as in the first method described above can be used. The mixing ratio of calcium carbonate and water glass as described above is such that water glass (in terms of a 10% aqueous solution) is added to 100 parts by weight of calcium carbonate.
Preferably, the amount is up to 20 parts by weight. If the water glass is less than 5 parts by weight, it becomes difficult to gel the calcium carbonate, while if it exceeds 20 parts by weight, it takes a long time for drying, which is not preferable.

Further, in the second method, a porosifying agent can be blended. As the porosifying agent, the same one as in the first method described above can be used, and the compounding amount may be the same.

In the second method, the above-mentioned slaked lime and water glass, and a porosifying agent added as required, are blended at predetermined ratios, and kneaded sufficiently to form a gel-like composition. By adjusting and heating and drying this gel-like composition, slaked lime can be used as a remover as a granular material having a size of about 2 to 30 mm as it is, preferably about 550 to 650 ° C., particularly about 550 ° C. By heating to 600 ° C. and drying, slaked lime is transformed into quicklime and used as a remover. Alternatively, the gel composition may be formed into a stick by shaping the gel composition into a stick shape, cutting the gel composition, and then drying by heating.

In such a lime-based granulated product, for example, quick lime (CaO) which occupies most of the lime-based agglomerated product is 400 to 400%.
When it comes in contact with a corrosive gas such as chlorine gas at a high temperature of 700 ° C., it reacts with chlorine gas (Cl 2) to fix it as calcium chloride (CaCl 2) on its surface, so that chlorine-based gas in exhaust gas is removed. It demonstrates its performance. Further, NOx and the like can be removed by a similar reaction. Then, if quick lime (CaO) sorbs calcium chloride to some extent, its catalytic activity decreases. However, if a small amount of water is supplied by steam or the like, quick lime rapidly becomes embrittled mainly at the surface portion and collapses. Since the proper surface is exposed, it is possible to reproduce the sorption property of the corrosive gas described above. By this repetition, the particle size of the lime-based granulated product becomes small, and the size of the lime-based granulated product becomes a predetermined size, for example,
If it is less than this, it may be sieved and fresh lime-based granules added little by little.

In particular, in the method of producing a lime-based granule by heating and drying from a gel composition as exemplified in the first and second methods, another catalyst substance, such as denitration, is required before the heating and drying. It is possible to mix a powder of a catalyst, a desulfurization catalyst, or the like, and there is also an effect that the performance of a lime-based granulated product as a catalyst can be easily improved and multifunctionalized.

As shown in FIG. 2, the first and second catalyst filter layers 3 and 5 having the lime-based granules described above are, for example, as shown in FIG.
Are joined at predetermined intervals by a frame 13 with two metal mesh plates 12, 12 having a finer grain size than the lime-based granules 11, 11,. Metal mesh plate
It can be formed by the filters (3a, 5a) filled in the space S formed between 12,12. The particle size of the lime-based granules may be appropriately set in consideration of the pressure loss of the exhaust gas described later and the efficiency of removing corrosive gas in the exhaust gas. The frame 13 is preferably made of a heat-resistant material. Filters (3a, 5a) as described above,
The first and second catalyst catalyst filter layers 3 and 5 can be formed by a single sheet or a continuous sheet of a plurality of sheets.

Next, the operation of the high-temperature corrosive gas removing apparatus of the first embodiment using the above-described lime-based agglomerated material for the catalyst filter layers 3 and 5 will be described.

When the solid fuel is burned in the incinerator 1 in the apparatus shown in FIG.
From a, it reaches the first catalyst filter layer 3 through the first pipe 4, and then reaches the second catalyst filter layer 5 through the second pipe 6. The filters 3a, 5a of the first catalyst filter layer 3 and the second catalyst filter layer 5
As described above, lime-based granules, particularly calcium carbonate or slaked lime, are gelled with water glass, and are formed by heating and drying the granules, so that it is possible to put them at a high temperature, It is possible to remove chlorine-based gases such as hydrogen chloride gas and chlorine gas and corrosive gases such as NOx contained in the high-temperature exhaust gas G. After removing the corrosive gas in the exhaust gas in this way, the third
Heat exchange is performed between the purified exhaust gas g flowing through the pipe 7 and the exhaust gas G flowing through the first pipe 3, and the purified exhaust gas g whose temperature has been increased is supplied to the boiler 8. Heat exchange is performed with the water, and the heat of the exhaust gas G is converted into high-temperature, high-pressure steam.
It can be reused as energy or heat source for power generation.

In such a high-temperature removing device, the outer wall surface of the water pipe 9 is exposed to the exhaust gas, but the exhaust gas G discharged from the incinerator 1 contains a large amount of corrosive gas as described above. Because, usually, the hot corrosion progresses rapidly around 320 ° C., so the service life is significantly short,
In addition to using a material that is resistant to thermal corrosion as the water pipe 9, the exhaust gas temperature when flowing through the boiler 8 is lowered to some extent,
In addition, the steam pressure had to be lowered, and as a result, the efficiency of the boiler system using the waste was considerably low. On the other hand, in this embodiment, since the corrosive gas which causes corrosion is removed in the first and second catalyst filter layers 3 and 5, there is no fear of such thermal corrosion. As the material 9, a general-purpose steel material can be used, and the temperature and the vapor pressure can be increased, so that the energy conversion efficiency is greatly improved. Further, the purified exhaust gas g is also supplied to the second and third pipes 5 and 7.
Therefore, the durability of these pipelines has been improved.

Further, the lime-based granules constituting the first filter 3a of the first catalyst filter layer 3 are made coarser, and the lime-based granules constituting the second catalyst filter layer 5 are reduced. First, the first catalyst filter layer 3 suppresses the pressure loss as much as possible by reducing the particle size.
By roughly removing the corrosive gas and then sufficiently removing the corrosive gas in the second catalytic filter layer 5, the efficiency of removing the corrosive gas can be increased while suppressing the pressure loss. desirable.

Further, as shown in FIG. 3, a lime-based granulated material having a small particle size to a predetermined thickness is provided below a cylindrical portion 4a formed in the first conduit 4 through a fine sieve 15. The first catalyst filter layer 3 is formed, and the second catalyst filter layer 5 made of a granular lime-based granule having a large particle size to a predetermined thickness is formed through a coarse sieve 16 above. The exhaust gas g from the incinerator 1 flows from the lower side of the pipe 4 to the upper side. Then, when the corrosive gas is sorbed to some extent and the catalytic activity of the first and second catalyst filter layers 3 and 5 is reduced, steam or the like is allowed to flow. Then, the lime-based granules, which are the catalyst, react rapidly with water on the surface and self-disintegrate, reducing the particle size.As a result, a new surface is exposed, and the catalytic activity is reproduced. can do. When the particle size is smaller than a predetermined value, the particles pass through the sieve 16 and fall from the second catalyst filter layer 5 to the first catalyst filter layer 3. 5 may be supplemented with a new lime-based granulated material having a large particle size. Further, the particles of the lime-based granules 8 of the first catalyst filter layer 3 which have become finer and become powdery fall from the sieve 15 and are taken out. After removing the reactants, it may be reused.

As described in detail above, the apparatus for removing corrosive gas at a high temperature according to the present invention of the present embodiment includes an incinerator 1 having an inlet 2 for refuse solid fuel and a chimney 1a; A first conduit 4, a second conduit 6, a third conduit 7, and a discharge conduit 10 communicating with one of the chimneys 1a, and the first conduit 4 and the second conduit 6 is provided with the first catalyst filter layer 3 and the second catalyst filter layer 5 having the lime-based granules 11, so that the high-temperature exhaust gas G discharged from the incinerator 1 passes through the filters 3a, 5a. Since the gas flows, the corrosive gas contained in the exhaust gas G can be removed at a high temperature. In addition, since the lime-based granules have a certain degree of mass, the pressure loss of the exhaust gas G is small. In particular, the lime-based granulated product is a granulated product obtained by kneading calcium carbonate, water glass, and sodium bicarbonate and drying by heating at about 900 ° C.
By making the granules heated and dried at 50 to 650 ° C., calcium carbonate or slaked lime can be made into a certain amount of quick lime such as granules, and in the kneading step, other catalytic substances such as a denitration catalyst are used. It becomes possible to knead it.

Next, a second embodiment of the high-temperature corrosive gas removing apparatus according to the present invention will be described with reference to FIGS. FIG.
Shows another boiler device to which the present invention can be applied,
The same components as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted. In this embodiment,
A flow path 21 is formed on the outer wall 22 of the heat-resistant incinerator 1 made of ceramic, and the base end of the flow path 21 communicates with the third conduit 7. It communicates with the boiler 8. As shown in FIG. 5, the outer wall 22 of the incinerator 1 has a bottom member 25 having an opening 23 communicating with the third conduit 7 and an annular groove 24, and opens to the groove 24 of the bottom member 25. A plurality of tubular preheating zone members 2 having a plurality of rising holes 26, 26,.
, And a top member 30 having an annular groove 28 in which the rising holes 26 are opened and a discharge port 29. The discharge port 29 communicates with a discharge path 31 connected to the boiler 8 having the water pipe 9.
31 is an RD for storing the RDF supplied to the incinerator 1
Connected to F stocker 32
(Not shown) and open to the external environment.

In the boiler apparatus as described above, when the solid fuel is burned in the incinerator 1, the high-temperature exhaust gas G passes through the first pipe 4 from the chimney 1a to the first catalyst filter layer 3. To reach. Further, after that, the gas reaches the second catalyst filter layer 5 through the second pipe 6 and the chlorine-based gas such as hydrogen chloride gas and chlorine gas and the corrosive gas such as NOx contained in the exhaust gas G are discharged. Removed. And after removing corrosive gas in the exhaust gas in this way,
The purified exhaust gas g flowing through the third pipe 7 is introduced into the flow path 21 from the opening 23. Then, this purified exhaust gas g
After being heated to a high temperature by the combustion heat of the RDF in the incinerator 1 and discharged from the discharge port 29 while flowing through the rising hole 26 from the annular groove 24 of the bottom member 25, the water and heat in the water pipe 9 of the boiler 8 are heated. The exchange is performed, and the water in the water pipe 9 can be reused as high-temperature and high-pressure steam as power generation energy or a heat source. Thereafter, in this embodiment, the purified exhaust gas g
Circulates in the RDF stocker 32.
Since slaked lime and quick lime are usually added in an amount of 1 to 2%, dust and trace amounts of residual chlorine gas can be immobilized as calcium chloride or the like. Moreover, in this embodiment, the exhaust gas g is circulated around the incinerator 1 immediately before reaching the boiler 8 and reheated, so that the water in the water pipe 9 can be converted into high-temperature and high-pressure steam. it can. Since the corrosive gas in the exhaust gas g has been removed to some extent, the water pipe 9 is hardly thermally corroded even at a high temperature, so that a normal steel material can be used as the water pipe 9 and the waste heat of the incinerator of the solid waste solid fuel. The versatility and economy have been improved as a device utilizing the. Further, since the purified exhaust gas g also flows through the second and third conduits 5 and 7, their durability can be improved.

The boiler device to which the present invention can be applied is not limited to the first embodiment described above.
Regardless of the type of boiler, it is desirable to supply gas at the highest possible temperature in terms of efficiency such as power generation.If corrosive gas flows, thermal corrosion cannot be avoided. Needless to say, it is applicable.

The apparatus for removing corrosive gas at a high temperature according to the present invention has been described with reference to the accompanying drawings. However, the present invention is not limited to the first and second embodiments. For example, the boiler 8 is not limited to a furnace tube boiler, but can be applied to various boilers. In each of the above embodiments, the first catalyst filter layer 3 and the second catalyst filter layer 5 are made of lime-based granules, but are further provided with a denitration catalyst or a desulfurization catalyst. Is also good.

[0037]

According to a first aspect of the present invention, there is provided an apparatus for removing corrosive gas at a high temperature, comprising: an incinerator having a solid fuel injection port and a chimney; and a flow path communicating with the chimney of the incinerator. Have
Since a catalyst filter having a lime-based granule is provided in the flow path, by flowing high-temperature exhaust gas through the filter, corrosive gas contained in the exhaust gas can be removed at a high temperature, In addition, since the pressure loss is small, heat can be exchanged with high efficiency by circulating the gas through a smoke tube of a boiler or the like.

In the apparatus for removing corrosive gas at a high temperature according to claim 2, the lime-based granulated product is a granulated product obtained by kneading calcium carbonate, water glass and baking soda and drying by heating.
Since calcium carbonate is formed into a certain amount of lump of lime such as granules, corrosive gas in the exhaust gas can be removed by providing it as a catalyst filter in an exhaust gas flow path around a high temperature combustion furnace. In addition, it becomes possible to knead another catalyst substance.

In the apparatus for removing corrosive gas at a high temperature according to claim 3, the lime-based granulated product is a granulated product obtained by kneading slaked lime and water glass and drying by heating. By providing this as a catalytic filter in an exhaust gas flow path around a combustion furnace where the temperature becomes high, corrosive gas in the exhaust gas can be removed.
In addition, it becomes possible to knead another catalyst substance.

In the apparatus for removing corrosive gas at a high temperature according to the fourth aspect, the heating and drying are performed at a temperature of 550 to 1000 ° C., so that calcium carbonate and slaked lime can be efficiently transformed into quicklime.

Further, in the apparatus for removing corrosive gas at a high temperature according to the fifth aspect of the present invention, since the heat exchanger is provided on the downstream side of the catalyst filter in the flow path, a place where the exhaust gas comes into contact with a pipe or exhaust gas flows. However, since it does not corrode even at high temperatures, the efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a boiler device according to a first embodiment to which the present invention can be applied.

FIG. 2 is a partially cutaway perspective view showing a catalyst filter used in the present invention.

FIG. 3 is a partially broken perspective view showing another catalyst filter.

FIG. 4 is a schematic view showing a boiler device according to a second embodiment to which the present invention can be applied.

FIG. 5 is a schematic view showing a furnace wall of the boiler device according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Incinerator 1a Chimney 2 Inlet 3 1st catalyst filter layer 4 1st pipe (flow path) 5 2nd catalyst filter layer 6 2nd pipe (flow path) 7 3rd pipe ( Flow path) 10 Drainage path (flow path) 11 Lime-based granules 8 Boiler (heat exchanger) G Exhaust gas

Claims (5)

[Claims] 1. An incinerator having an inlet and a chimney for refuse solid fuel, and a flow passage communicating with the chimney of the incinerator.
An apparatus for removing corrosive gas at high temperature, wherein a catalyst filter having lime-based granules is provided in the flow path. 2. The high-temperature corrosive gas removing apparatus according to claim 1, wherein the lime-based granulated product is a granulated product obtained by kneading calcium carbonate, water glass, and baking soda and heating and drying the mixture. 3. The high-temperature corrosive gas removing apparatus according to claim 1, wherein the lime-based granulated material is a granulated material obtained by kneading slaked lime and water glass and drying by heating. 4. The apparatus for removing corrosive gas at high temperature according to claim 2, wherein the heating and drying are performed at a temperature of 550 to 1000 ° C. 5. The high-temperature corrosive gas removing apparatus according to claim 1, further comprising a heat exchanger downstream of the catalyst filter in the flow path.