JPH08135935A - Apparatus and method for treating waste - Google Patents

Abstract

PURPOSE: To ensure thermal decomposition of a waste after water in the waste is sufficiently removed, and hence prevent ash, etc., from causing difficulty in making molten slag owing to low temperature in combustion and melting in a waste treatment technique in which the waste is thermally decomposed and a thermal decomposition product is combusted and processed to a temperature where a combustion residue is made melted slug. CONSTITUTION: Part of steam produced in a waste heat boiler 15 is introduced into a drier 1. The steam and a waste in the drier 1 are indirectly heat- exchanged to dry the waste. Heating temperature of the waste is assumed to be substantially 200 deg.C or lower where the waste can be dehydrated. Water vapor produced by drying from the waste is fed through a conduit 21 to an inlet of a flue 13, i.e., an outlet for combustion waste gas from a combustion melting furnace 9. Part of the water vapor is properly introduced into the combustion melting furnace 9 through a conduit 22 in order to suppress excessive high temperature of the combustion melting furnace 9. The waste from which water is removed is carried to a thermal decomposition reactor 4 with a carrying device 3 such as a feeder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention thermally decomposes waste (general waste such as municipal solid waste discharged from homes and offices, industrial waste such as waste plastic, and other combustible materials), The present invention relates to a waste treatment technology for burning and treating the thermal decomposition product generated by.

[0002]

2. Description of the Related Art This type of waste treatment technology is disclosed in West German Patent Publication No. 3725704.8, West German Patent Publication N
o. 3811820.3 and Japanese Patent Application Laid-Open No. 1-49816. In the technologies disclosed in these publications, waste containing a combustible material is heated to be thermally decomposed, and a thermal decomposition product (a low temperature carbonization gas and a thermal decomposition residue mainly composed of a non-volatile component) generated thereby is decomposed. The separated char) is burned, the exhaust gas of this combustion is guided to a waste heat boiler to generate steam, and the steam is used to generate power to recover heat energy.

Further, when the pyrolysis products are burned, the combustion residue such as ash is melted into slag at a high temperature (generally, 12
It is also possible to convert the combustion residue into slag that can be reused as a building, road aggregate, etc. by burning at a temperature of about 00 ° C or higher). In this case, an inorganic harmful substance such as a heavy metal oxide generated by thermal decomposition can be enclosed and processed in the form of an ash-melted solidified product without the risk of flowing out to the environment.

[0004] In addition, according to such a technique, valuable substances such as iron and non-ferrous substances after separating char from the pyrolysis residue can be recovered in a non-oxidized state as slightly large coarse particles, and dibenzoxine chloride and dibenzofuran chloride can be recovered. It also has many advantages such that organic toxic substances such as are not emitted, and waste heat of combustion exhaust gas flowing through the flue can be effectively used.

However, with such a technique, when the waste to be treated contains a large amount of water, the low-temperature carbonization gas produced by thermal decomposition contains a considerable amount of water vapor, and due to the insufficient calorific value, the low-temperature carbonization gas and char Therefore, the combustion temperature may be lowered, and the combustion residue may not reach the temperature at which it becomes molten slag.

[0006] Therefore, as a technique for drying the waste to be treated, European Patent Publication No. 03600
There is a technology disclosed in 52A1. That is, according to the technique disclosed in the publication, an inner lining is provided on the waste input side in the thermal decomposition reactor, and a heat medium (thermal oil, hot water, saturated steam or steam mixed water) is circulated. The heat source for this heat medium is self-sufficient from the steam turbine or waste heat system in the system of the waste treatment facility. Further, a burner is provided on the discharge side of the low temperature carbonization gas and the thermal decomposition residue in the thermal decomposition reactor, and the fuel of this burner is self-supplied with the low temperature carbonization gas generated in the thermal decomposition reactor.

[0007] With the above-mentioned configuration, the waste that is put into the pyrolysis reactor moves from the waste input side to the low temperature carbonization gas and the discharge side of the pyrolysis residue. In this process, first, on the waste input side, 10
It is heated to 0 ° C and the water is evaporated to dryness. The steam generated by this drying is sucked out of the thermal decomposition reactor by a pump and sent to the high temperature combustion chamber. The waste after drying is thermally decomposed by being heated by the heat of the flame of the burner on the discharge side of the low temperature carbonization gas and the thermal decomposition residue.

In addition, when the waste is introduced into the thermal decomposition reactor at room temperature or the like, in the thermal decomposition reactor, in addition to the amount of heat required for thermal decomposition, the temperature of the waste is raised to the temperature of the thermal decomposition reactor. Needs a heat quantity of. Generally, the amount of heat required for this temperature increase is much larger than the amount of heat required for the thermal decomposition itself. Especially when the waste contains water, not only the sensible heat but also the latent heat of evaporation of water must be supplied, and the amount of heat required in the thermal decomposition reactor becomes very large. For example, municipal solid waste contains at least 30 wt%, and if it is large, about 60 wt% of water, the latent heat of vaporization of this water is half of the total amount of heat required in the thermal decomposition reactor.
Reach above

As described above, a large amount of heat is required for thermal decomposition and the like. 036
The technology disclosed in 0052A1 is self-sufficient in the system of the waste treatment facility for both the heat required for thermal decomposition and the heat required for drying the waste, which is advantageous from the viewpoint of reducing the waste treatment cost.

[0010]

However, the technique of self-sufficient heat required for the thermal decomposition reactor cannot completely separate the thermal decomposition process and the drying process of the waste, and the thermal decomposition process is not possible. It is not possible to sufficiently prevent the steam generated on the waste input side in the reactor from mixing with the low temperature carbonization gas and the low temperature carbonization gas generated on the discharge side of the thermal decomposition residue. Further, it is not possible to sufficiently prevent low-temperature carbonization gas from being mixed into the steam to be sucked out.

Therefore, even the above-mentioned conventional technique cannot completely prevent the possibility that molten slag such as ash cannot be formed due to insufficient temperature. Further, as described above, if all the steam sucked out of the pyrolysis reactor by the pump or the like is sent to the high temperature combustion chamber for processing, the calorific value of the low temperature carbonization gas and the char will be greatly reduced and combustion at high temperature will be possible. It goes without saying that it will disappear. On the other hand, the steam sucked out of the pyrolysis reactor cannot be released into the atmosphere as it is, because it contains flammable low-temperature carbonization gas in addition to the malodorous substances emitted from the waste. If a combustion facility is provided separately from the high temperature combustion chamber and such a facility is used to treat such steam, the construction cost of the waste treatment facility will be high.

The present invention is a waste treatment technique in which waste is pyrolyzed and the pyrolysis product is burned to a temperature at which the combustion residue becomes molten slag to be treated, and water in the waste is sufficiently removed. It is an object of the present invention to provide a waste treatment apparatus and method that can later perform thermal decomposition of waste and can completely prevent a situation where molten slag such as ash cannot be formed due to insufficient temperature. .

[0013]

A first aspect of the invention for solving the above-mentioned problems is to heat and pyrolyze a waste material to separate it into a low temperature carbonization gas and a pyrolysis residue mainly consisting of non-volatile components. Pyrolysis reactor, a combustor that combusts the char separated from the pyrolysis residue and the low-temperature carbonization gas at a temperature at which the combustion residue can be molten slag, and the exhaust port for discharging the combustion exhaust gas to the outside air. In a waste treatment device provided with a flue that guides exhaust gas from combustion, steam as a heat medium and the waste are indirectly heat-exchanged, and the waste is dehydrated at a temperature of about 200 ° C. or lower. A dryer that heats and dries to a variable temperature, and a steam discharge means that discharges steam generated from waste by this drying to the outside of the dryer,
And a means for conveying the dried waste to the thermal decomposition reactor for performing the thermal decomposition.

A second aspect of the present invention is the waste treatment apparatus of the first aspect of the present invention, which is provided with a water vapor introduction path for introducing the water vapor discharged by the water vapor discharge means to the flue.

A first or a first feature of the invention is provided with a temperature adjusting means for appropriately introducing a part of the steam discharged by the steam discharging means into the combustor and suppressing an excessively high temperature of the combustor. The waste treatment device of the second invention is a third invention.

The waste is introduced into the pyrolysis reactor, heated and pyrolyzed to separate it into a low temperature dry distillation gas and a pyrolysis residue mainly composed of non-volatile components, and the waste is separated from the pyrolysis residue. A waste treatment method including a step of burning char and the low-temperature carbonization gas at a temperature at which a combustion residue can be molten and slagged, and a step of guiding a combustion exhaust gas generated by this combustion to a flue for discharging to the outside air. In, the step of indirectly exchanging heat between steam as a heat medium and the waste, and heating the waste to a temperature at about 200 ° C. or lower that can be dehydrated and drying, and the waste by this drying Characterized in that it includes a step of separating water vapor generated from the waste from this waste, and a step of transporting the dried waste to the thermal decomposition reactor as a pretreatment step of the thermal decomposition step. Waste treatment Law and the fourth invention.

A fifth aspect of the present invention is the waste treatment method of the fourth aspect, which includes a step of introducing the separated steam to the flue.

The combustion step of the char and the low-temperature carbonization gas is carried out while introducing a part of the separated steam into the combustion atmosphere to suppress an excessive high temperature of combustion. The waste treatment method of the fifth invention is the sixth invention.

[0019]

According to each of the above inventions, steam is used as a heat source as a heat source to indirectly exchange heat with waste, and the waste is dried at a temperature of about 200 ° C. or lower and dehydratable. (Indirect heating method) can be performed. The temperature is set to about 200 ° C. or lower because the thermal decomposition of waste starts at about 200 ° C., so that inflammable low-temperature carbonization gas is not mixed in the steam generated by drying. This is because the waste temperature should be kept at about 200 ° C. The temperature at which the temperature is about 200 ° C. or less and at which dehydration is possible is specifically about 100 to 200 ° C., more preferably about 100 to 150 ° C. 150 ° C
In the following, adhesion of the waste plastic or the like to the heat transfer surface due to melting is less likely to occur.

In each invention, the water vapor generated from the waste by heating and drying is separated from the waste by being discharged to the outside of the dryer, and the waste that has been sufficiently dehydrated can be conveyed to the thermal decomposition process. it can. Thus, the present invention completely separates the waste drying process and the thermal decomposition process, and
In the drying process, the heating and drying temperature was kept at a temperature at which pyrolysis did not occur, so unlike the conventional technology, the steam generated in the drying process and the low temperature carbonization gas generated in the thermal decomposition process did not mix, and the low temperature carbonization gas When burning the char and char at high temperature, there is no fear that molten slag such as ash cannot be formed due to insufficient temperature. Further, since the steam generated in the drying process does not contain combustible gas, it is not necessary to install a special combustion facility for treating this steam, and the construction cost of the waste treatment facility is not unnecessarily increased. When the waste heat steam generator is installed in the flue and the heat of the combustion exhaust gas is recovered, the steam that is the heating and drying heat source uses the steam generated by this waste heat steam generator and is required for heating and drying. It is desirable because a large amount of heat can be self-sufficient within the system of the waste treatment facility and the waste treatment cost can be reduced.

As a heating / drying technique for supplying a heat source by itself in the system of a waste treatment facility, it is possible to use the combustion exhaust gas flowing through the flue as a heat source. In this case, a direct heating method in which the combustion exhaust gas is directly introduced into the waste for heating, and an indirect heating method in which the combustion exhaust gas and the waste are indirectly heat-exchanged for heating are considered. However, if an indirect heating method using steam as a heat source is used as in the present invention, it can be heated and dried by using the latent heat of vaporization of steam, so that it can be sufficiently heated by supplying a relatively small amount of steam. Unlike the indirect heating method that uses combustion exhaust gas, which does not need to introduce a large amount of combustion exhaust gas as a heat medium, it does not unnecessarily make the combustion exhaust gas transportation equipment, the dryer, and the like huge. Moreover, when steam is used, since it indirectly heats in the condensation process, the heat transfer efficiency is better than that of the indirect heating method using combustion exhaust gas.

Since the steam generated from the waste contains the odor component contained in the waste, it is desirable to remove the odor before it is released into the atmosphere in view of environmental protection. 2nd, 5th invention is a structure which introduce | transduces the water vapor containing such an odor component to a flue. The high temperature combustion exhaust gas immediately after burning the low temperature carbonization gas and the char at a temperature at which the combustion residue becomes molten slag is circulated in the flue, particularly in the portion near the inlet thereof. Therefore, the odor component in the introduced steam is deodorized by being burned by the high temperature combustion exhaust gas, or converted into a substance that can be easily removed by the exhaust gas purification equipment provided downstream of the flue (especially ammonia, aldehyde,
Amines, sulfides, mercaptans, etc.).

Even when the above-mentioned direct heating system using the combustion exhaust gas as a heat source is used, since the combustion exhaust gas containing steam after use contains odorous components, it is introduced into the inlet of the flue. Although it is necessary to remove the odorous component, the amount of combustion exhaust gas containing water vapor is generally very large, and therefore it tends to be difficult to introduce it into the inlet of the flue. Also,
By introducing such a large amount of gas, the temperature at the inlet of the flue may be lowered, and the odorous components may not be deodorized. On the other hand, since the present invention is an indirect heating method using steam as a heat medium, only the steam generated from the waste needs to be introduced to the inlet part of the flue, and in general, it is a relatively small amount. There is no difficulty in introducing it at the entrance,
Since the temperature at the inlet of the flue is not lowered so much, the odorous components can be sufficiently removed.

When the low-temperature carbonization gas and char are burned at a temperature at which the combustion residue becomes molten slag, the combustion temperature may become excessively high. Japanese Patent Laid-Open No. 1-49816
In such a case, a technique is disclosed in which, in such a case, the temperature inside the furnace is lowered by, for example, guiding low-temperature combustion exhaust gas flowing near the outlet of the flue to a combustion melting furnace by a conduit. According to the third and sixth inventions, after the waste is dried, a part of the water vapor separated from the waste is introduced into the combustion atmosphere of the low temperature carbonization gas and the char, thereby lowering the combustion temperature and increasing the excess temperature. Can be suppressed. Therefore, it is not necessary to specially provide a conduit or the like for guiding low-temperature combustion exhaust gas as in the conventional case. In this case, the specific temperature of the excessive high temperature,
It goes without saying that the introduced steam should be adjusted in consideration of various conditions such as the amount of steam to be introduced, the temperature and the amount of water. The odorous component in the steam introduced into the combustion atmosphere of the low-temperature carbonization gas and the char is burned together with the low-temperature carbonization gas and the char to be deodorized. Further, an excessive amount of steam other than the excessive high temperature suppression can be deodorized by branching and leading to the flue of the latter stage of the combustor as described above.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall system diagram of a waste treatment device according to an embodiment of the present invention. Reference numeral 1 denotes a dryer as an example of the dryer in the present invention, which can be configured using, for example, a general rotary kiln-like thermal decomposition drum. Reference numeral 2 denotes a hopper that puts waste into the dryer 1. The waste is subjected to predetermined heating and drying (this will be described later), and is conveyed by the conveying device 3 such as a feeder as an example of the conveying means in the present invention, and the thermal decomposition reactor as an example of the thermal decomposition reactor in the present invention. 4 is transported.

As the thermal decomposition reactor 4, a horizontal rotary drum (rotary kiln), a vertical shaft kiln, etc. have been conventionally used. Considering the residence time of the waste in the thermal decomposition reactor 4, It is desirable to use the former.
Further, JP-A-3-63407 also shows an example of a suitable thermal decomposition reactor. Reference numeral 19 is a burner, and the combustion exhaust gas generated by the combustion of the burner 19 is introduced into a heat transfer tube or the like provided in the thermal decomposition reactor 4 and serves as an indirect heating source for thermal decomposition of waste. Rotating the thermal decomposition reactor 4 at about 300 to 900 ° C., 30 to take out aluminum or the like as unmelted valuables from the thermal decomposition residue.
The waste is heated to about 0 to 600 ° C. and pyrolyzed, and low-temperature dry distillation gas and mainly non-volatile pyrolysis residue are generated. Reference numeral 5 denotes a carry-out device, and the pyrolysis residue is carried by a pyrolysis residue carrying line 6 provided on the bottom side of the carry-out device 5 and guided to the pyrolysis residue separating device 7. The low-temperature carbonization gas is introduced into a combustion melting furnace 9 as an example of a combustor according to the present invention through a conduit 8 provided on the upper side of the carry-out device 5.

The residue separating device 7 is composed of, for example, a sieve, and separates the pyrolysis residue into rubble, aluminum, iron, etc. and char. The separated char is the transportation line 10
Is blown into the conduit 8 and introduced into the combustion melting furnace 9 together with the low temperature carbonization gas. Combustion air is introduced into the combustion melting furnace 9 through a ventilation pipe 11. In the combustion melting furnace 9, the low temperature carbonization gas and char are burned with this combustion air. This combustion can be a high temperature combustion by making the air ratio relatively small (the temperature is about 1200 ° C. or higher, preferably about 1300 ° C.), the ash is melted, and the cooling water tank 12 is supplied from the bottom of the combustion melting furnace 9. Drop it as a slag and take it out.

Reference numeral 13 is a flue as an example of the flue of the present invention, which guides the combustion exhaust gas generated in the combustion melting furnace 9 to the chimney 14 as an example of the discharge port of the present invention. A waste heat boiler 15 is provided in the flue 13, and high-temperature steam is obtained by heat exchange with the combustion exhaust gas guided in the flue 13. This steam is used for power generation. The flue gas after heat exchange in the waste heat boiler 15 has its dust removed by a dust collector 16 provided further downstream of the flue 13 and is introduced into a flue gas purification device 17 further provided downstream of the flue 13. Desulfurization, denitration, etc.
Is discharged to the outside air. The dust removed by the dust collector 16 passes through the transfer line 18, the transfer line 10, and the conduit 8.
It is returned to the combustion melting furnace 9.

The dryer 1 has, for example, a jacket portion provided on the outer wall thereof, a heat transfer tube provided inside thereof, and the like.
By 0, a part of the steam generated in the waste heat boiler 15 is introduced. In the dryer 1, indirect heat exchange is performed between the waste and steam via the wall portion such as the jacket portion and the heat transfer tube, and the waste material is heated and dried. The heating temperature of the waste is about 200 ° C. or lower, which is a temperature at which the waste can be dehydrated. Specifically, the temperature is preferably about 100 to 200 ° C, more preferably about 100 to 150 ° C.

The steam generated by heating and drying the waste is
The conduit 21 as an example of the steam discharge means and steam introduction path in the present invention guides the gas to the inlet of the flue 13, that is, the outlet of the combustion exhaust gas from the combustion melting furnace 9. In this way, the waste that is dried by using steam as a heat source and separated from the steam generated by the drying is transported to the pyrolysis reactor 4 by the transport device 3 such as a feeder. In order to maintain the heating temperature of the waste at the above-mentioned temperature, the amount of waste in the dryer 1, its composition, and the conduit 20
The steam flow rate to be supplied to the dryer 1 is adjusted in consideration of various conditions such as the steam temperature supplied in.

A conduit 22 is branched from the conduit 21 as an example of the temperature adjusting means in the present invention, and a part of the steam flowing through the conduit 21 can be appropriately introduced into the combustion melting furnace 9. This is to return the temperature in the combustion melting furnace 9 to an appropriate temperature by introducing steam when an excessively high temperature in the combustion melting furnace 9 occurs. Therefore, it goes without saying that the amount of steam to be introduced should be adjusted in consideration of various conditions such as a specific temperature of excessively high temperature, the amount of steam to be introduced, and temperature.

Next, the operation of this embodiment will be described. According to the above configuration, it is possible to perform indirect heat exchange with waste by using steam as a heat medium as a heat source, and indirectly heat and dry the waste at a temperature of about 200 ° C. or less and at which dehydration is possible. it can. The temperature is set to about 200 ° C. or lower because the thermal decomposition of waste starts at about 200 ° C., so that inflammable low-temperature carbonization gas is not mixed in the steam generated by drying. This is because the waste temperature should be kept at about 200 ° C. The temperature at which the temperature is about 200 ° C. or lower and the water can be dehydrated is specifically about 10
It is desirable that the temperature is 0 to 200 ° C, and more preferably about 100 to 150 ° C.

The steam generated from the waste due to the heating and drying is separated from the waste by being discharged to the outside of the dryer 1 through the conduit 21, and the sufficiently dehydrated waste is conveyed by the conveying device 3
Can be conveyed to the thermal decomposition reactor 4. As described above, in this embodiment, the drying process and the thermal decomposition process of the waste are completely separated, and in addition, since the heating and drying temperature is kept at a temperature at which the thermal decomposition does not occur in the drying process, unlike the prior art, The steam generated in the drying process and the low-temperature carbonization gas generated in the thermal decomposition process do not mix with each other, and when the low-temperature carbonization gas and char are burned at high temperature in the combustion melting furnace 9, due to insufficient temperature, molten slag such as ash is formed. There is no fear that you will not be able to. Further, since the steam generated in the drying process does not contain combustible gas, it is not necessary to install a special combustion facility for treating the vapor, and the construction cost of the waste treatment facility is not unnecessarily increased. The steam supplied through the conduit 20 may be steam generated outside the system of the waste treatment apparatus of the present embodiment, instead of steam generated in the waste heat boiler 15, but the steam generated in the waste heat boiler 15 is used. In this case, a large amount of heat required for heating and drying can be self-sufficient in the system of the waste treatment device, and the waste treatment cost can be reduced, which is desirable.

When an indirect heating method using steam as a heat source is used as in this embodiment, the latent heat of vaporization of steam can be used for heating and drying, so that it is possible to sufficiently heat by supplying a relatively small amount of steam. Unlike the indirect heating method that uses the combustion exhaust gas that flows through the flue 13, it does not need to use a large amount of combustion exhaust gas as a heat medium because it does not use sensible heat. There is no need to make it huge. Moreover, when steam is used, since it indirectly heats in the condensation process, the heat transfer efficiency is better than that of the indirect heating method using combustion exhaust gas.

In this embodiment, the water vapor containing the odorous component is guided to the inlet of the flue 13 through the conduit 21. At the inlet of the flue 13, the high temperature combustion exhaust gas immediately after the low temperature carbonization gas and the char are burned in the combustion melting furnace 9 at a temperature at which the combustion residue becomes molten slag is circulated. Therefore, the odorous component in the introduced steam is burned by the high temperature combustion exhaust gas to be deodorized or changed into a substance that can be easily removed by the gas purifier 17 downstream of the flue.

Since the present embodiment is an indirect heating method using steam as a heat medium, only steam generated from the waste needs to be introduced to the inlet of the flue 13 and, in general, a relatively small amount of steam is used. Compared to the case of using the direct heating method in which the combustion exhaust gas flowing through the passage 13 is used as a heating and drying heat source, the flue 1
No difficulty occurs in introducing it into the inlet of No. 3, and the temperature of the inlet of the flue 13 is not lowered so much, so that the odorous component can be sufficiently removed.

In this embodiment, a part of the steam generated from the waste in the conduit 22 is appropriately introduced into the combustion melting furnace 9. As a result, the combustion temperature of the combustion melting furnace 9 can be lowered and an excessive high temperature can be suppressed. Therefore, it is not necessary to specially provide a conduit or the like for guiding low-temperature combustion exhaust gas as in the conventional case. The odorous component in the steam introduced into the combustion atmosphere of the low-temperature carbonization gas and the char is burned together with the low-temperature carbonization gas and the char to be deodorized.

For reference, the results of bench test-class experiments conducted by the present inventors using the waste treatment apparatus having the above-described structure are shown below. The waste treatment capacity of the used waste treatment equipment is 8 kg / hr. Table 1 is a table showing the material balance and heat balance of the dryer 1, and Table 2 is a table showing the material balance and heat balance of the thermal decomposition reactor 4. Also, Table 3
6 is a table showing a material balance and a heat balance of the thermal decomposition reactor 4 when the dryer 1 is removed by the same device as the comparative example and the waste is not dried. In any table
The term “crushed waste” indicates the wastes that were the subject of this experiment, and the composition is shown in each table. In Table 1, “dehumidifying steam” indicates water vapor generated from waste in the dryer 1. In Table 1, "steam" is
The steam introduced as a heating and drying heat source is shown.
In Tables 2 and 3, “heating gas” indicates a gas as a heating medium used as a heating heat source of the thermal decomposition reactor 4. In Tables 2 and 3, "decomposition gas" indicates the low temperature carbonization gas produced in the thermal decomposition reactor 4. “In” means the amount introduced into the dryer 1 or the thermal decomposition reactor 4,
The term “out” indicates the amount discharged from the dryer 1 or the thermal decomposition reactor 4. As is clear from the comparison between Tables 2 and 3, the waste treatment apparatus according to the present embodiment has a thermal decomposition reactor 4 that is different from the conventional waste treatment apparatus that does not use the dryer 1.
It has become possible to reduce the required amount of heating gas, which is the heating source, in the above to less than half.

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

[Table 3]

[0042]

According to the present invention described above, in the waste treatment technology of thermally decomposing waste and burning the pyrolysis product to a temperature at which the combustion residue becomes molten slag for treatment,
It is possible to perform thermal decomposition of the waste after sufficiently removing the water content in the waste, and thus to completely prevent the situation where molten slag such as ash cannot be formed due to insufficient temperature in the combustion melting furnace. A waste treatment device and method can be provided.

[Brief description of drawings]

FIG. 1 is a system diagram of a waste treatment device according to an embodiment of the present invention.

[Explanation of symbols]

 1 Dryer 3 Transport Device 4 Pyrolysis Reactor 9 Combustion Melting Furnace 13 Flue 20, 21, 22 Conduit

Claims (6)

[Claims] 1. A pyrolysis reactor for heating and thermally decomposing waste to separate it into a low-temperature dry distillation gas and a pyrolysis residue mainly consisting of non-volatile components, a char separated from the pyrolysis residue, and the above-mentioned char. In a waste treatment device provided with a combustor that burns a low-temperature carbonization gas at a temperature at which a combustion residue can be molten and slagged, and a flue that guides the exhaust gas from the combustion to an exhaust port for discharging the combustion exhaust gas to the outside air. A steam dryer as a heat medium that indirectly exchanges heat with the waste, and heats the waste to a temperature at about 200 ° C. or lower that can be dehydrated to dry the waste; A waste comprising a steam discharge means for discharging the generated steam to the outside of the dryer, and a means for conveying the dried waste to the pyrolysis reactor for carrying out the pyrolysis. Material processing equipment 2. The waste treatment apparatus according to claim 1, further comprising a steam introducing path for guiding the steam discharged by the steam discharging means to the flue. 3. A temperature adjusting means for appropriately introducing a part of the steam discharged by the steam discharging means into the combustor to suppress an excessively high temperature of the combustor. The waste treatment device according to Item 1 or 2. 4. A step of introducing waste into a pyrolysis reactor, heating it to pyrolyze it, and separating it into a low temperature dry distillation gas and a pyrolysis residue mainly consisting of non-volatile components, and from the pyrolysis residue. Waste that includes a step of burning the separated char and the low-temperature carbonization gas at a temperature at which a combustion residue can be molten and slagged, and a step of guiding a combustion exhaust gas generated by this combustion to a flue for discharging to the outside air. In the treatment method, a step of indirectly exchanging heat between steam as a heat medium and the waste, heating the waste to a temperature of about 200 ° C. or lower and allowing dehydration, and drying, Separating the steam generated from the waste from this waste;
And a step of transporting the dried waste to the pyrolysis reactor as a pretreatment step of the pyrolysis step. 5. The waste treatment method according to claim 4, further comprising the step of guiding the separated steam to the flue. 6. The step of burning the char and the low-temperature carbonized gas is performed while introducing a part of the separated steam into a combustion atmosphere to suppress an excessive high temperature of combustion. Item 4. The waste treatment method according to Item 4 or Item 5.