JP5040174B2 - Method and apparatus for producing mixed fuel of dry sludge and waste carbide - Google Patents

Description

  The present invention manufactures solid fuel using as raw materials dry sludge obtained by drying sludge discharged from wastewater treatment facilities and sewage treatment facilities, and waste carbide obtained by carbonizing waste such as municipal waste. The present invention relates to a mixed fuel manufacturing method and apparatus for dry sludge and waste carbide.

  Sludge discharged from wastewater treatment facilities and sewage treatment facilities has a moisture content of about 70 to 80% only by performing normal dehydration treatment. It is necessary to dry the sludge containing (dehydrated sludge). Therefore, if the sludge is dried to obtain a dried sludge, the dried sludge contains no foreign matter and has uniform properties, and can be used as a fuel without being carbonized.

  As a method for converting this kind of sludge into fuel, for example, sewage sludge is dried with a dryer until the water content becomes 10% or less, and a portion of the dried sludge is carbonized and activated in a carbonization furnace. After making sludge activated carbon into the sludge activated carbon, the sludge activated carbon is added to the rest of the dried sludge and mixed uniformly, and the mixture formed is granulated with a molding machine to become a solid fuel. Conventionally, a method for producing a solid fuel has been proposed (see, for example, Patent Document 1).

  On the other hand, waste such as municipal waste has less moisture than sludge, but when it is dried, its apparent specific gravity is small and its properties are uneven. Furthermore, since chlorine-containing plastics such as vinyl chloride, which are feared to become a source of foreign substances and harmful gases, are included, it is difficult to use as it is as fuel.

  Therefore, as a technique for effectively using waste such as municipal waste as fuel, in recent years, waste is heated in a carbonization furnace in a low-oxygen atmosphere and carbonized (pyrolysis). Disposal of generating combustible pyrolysis gas and waste carbide as pyrolysis residue (hereinafter simply referred to as carbide), then collecting the carbide and using it as fuel in coal-fired boilers at various facilities A carbonization system (see, for example, Patent Document 2) has attracted attention and has been put into practical use. Carbide obtained by carbonizing waste in this way has almost uniform properties as long as foreign substances such as metals and incombustibles are selectively removed. Chlorine is gasified and volatilized or is inorganically salified. However, it is excellent as a fuel.

  As a waste carbonization furnace (pyrolysis furnace) for carbonizing waste as described above, a partial combustion (internal combustion) type waste carbonization furnace and an external heat type waste carbonization furnace are conventionally known.

  Among these, the partial combustion type waste carbonization furnace combusts a part of the waste supplied into the furnace, and directly heats the remainder of the waste by using the combustion heat generated by this combustion as a heat source. It is made to process. Therefore, in this type of partial combustion type waste carbonization furnace, a part of the supplied waste is combusted, but the combustible that is generated when the remainder of the waste is heated and carbonized by using the heat of combustion as a heat source. The pyrolytic gas (dry distillation gas) can be taken out from the waste carbonization furnace and recovered.

  Therefore, in the partial combustion type waste carbonization furnace, waste such as municipal waste can be carbonized by self-heating, and combustible pyrolysis gas can be recovered, so that there is surplus in terms of calorific value.

  On the other hand, in an external heat type waste carbonization furnace, the waste supplied into the furnace is indirectly heated by external heat to be carbonized. Specifically, for example, an external heat kiln type waste carbonization furnace (external heat kiln furnace) 1 is shown as an example of the external heat type waste carbonization furnace in FIG. The kiln furnace body 2 in which the heating channel 5 is provided between the inner and outer cylinders as a double cylinder structure including the inner cylinder 3 and the outer cylinder 4 is slightly lower on the outlet 7 side on the other end than on the inlet 6 side on one end. It is provided so that it can be rotated by being placed horizontally and inclined. The inlet 6 at one end in the longitudinal direction of the kiln furnace body 2 is provided with a charging hopper 9 via a feeder 8, and the pyrolysis gas 11 and heat are provided at the outlet 7 at the other end in the longitudinal direction of the kiln furnace body 2. The separation chamber 10 for separating the carbide 12 as the decomposition residue is provided. Thereby, while the kiln furnace body 2 is rotated at a low speed, the waste 13 put into the charging hopper 9 is gradually supplied into the inner cylinder 3 of the kiln furnace body 2 by the dust feeder 8 while By passing a high-temperature heating gas 14 through the heating flow path 5 between the inner and outer cylinders, the waste 13 in the kiln furnace body 2 is indirectly heated by external heat to be dried and carbonized. . The pyrolysis gas 11 generated by the carbonization treatment and the carbide 12 as the pyrolysis residue are separated in the separation chamber 10, and then the pyrolysis gas 11 is connected to the upper portion of the separation chamber 10. The carbide 12 can be recovered through a carbide extraction line (pyrolysis residue line) 16 connected to the lower end of the separation chamber 10.

  Further, a branch line (collection line) 17 is branched from the intermediate position in the pyrolysis gas take-out line 15, and the branch line 17 is connected to a hot air generating furnace 18 as a combustion furnace. A part of the pyrolysis gas 11 recovered from the thermal kiln furnace 1 to the pyrolysis gas extraction line 15 is supplied to the hot air generator 18 through the branch line 17 and burned by the heat recovery air 19 to be heated at a high temperature. A gas (hot air) 14 can be generated. The high-temperature heating gas 14 generated in the hot-air generating furnace 18 is supplied from the gas inlet 21 provided at the outlet 7 side end of the kiln furnace body 2 of the external heating kiln furnace 1 through the heating gas supply line 20 to the heating flow path 5. And the heat flow path 5 is circulated from the outlet 7 side of the kiln furnace body 2 to the inlet 6 side so that the waste 13 can be used as a heat source for heating and carbonizing. It is.

  Therefore, by using the combustion heat of the pyrolysis gas 11 as a heat source as described above, the waste 13 can be carbonized by self-heating even in an externally heated waste carbonization furnace such as the external heat kiln furnace 1. Since the remainder of the pyrolysis gas 11 excluding a part consumed in the hot air generator 18 from the pyrolysis gas 11 recovered to the pyrolysis gas take-out line 15 can be recovered as a combustible gas, it is surplus in terms of calorific value. There is.

  In FIG. 3, after being recovered from the external heat kiln furnace 1 to the pyrolysis gas extraction line 15, the remainder of the pyrolysis gas 11 excluding a part consumed in the hot air generator 18 is the external heat kiln. After being recovered from the furnace 1 to the carbide take-out line 16, it is sent to the melting furnace 23 together with the carbide 12 from which the metals 22 have been separated and recovered, and further burned to convert the ash and the like into molten slag 24.

  Reference numeral 25 denotes a ventilation dryer for drying in advance the waste 13 put into the charging hopper 9 of the external heat kiln furnace 1, and the ventilation dryer 25 includes a heated gas 14 supplied to the external heat kiln furnace 1. Is passed through the heating channel 5 and used as a heat source for carbonization of the waste 13, and then discharged from a gas outlet 26 provided in communication with the heating channel 5 at the end of the kiln furnace body 2 on the inlet 6 side. The exhausted heated gas (combustion exhaust gas) 14a is guided through a heated gas recovery line (combustion exhaust gas line) 27 provided with a heated gas circulation fan 28, whereby the heat remaining in the exhaust heated gas 14a is transferred to the ventilation dryer. 25 can be used as a heat source for drying the waste 13. The waste dry exhaust (dry exhaust gas) 29 discharged from the aeration dryer 25 is circulated to the hot air generating furnace 18 through the exhaust line 30, and the surplus is branched from the exhaust line 30. The exhaust gas is led to the exhaust gas outlet 23a of the melting furnace 23 through the exhaust line 31 so that high temperature treatment can be performed. Reference numeral 32 denotes a pyrolysis gas fan provided at a position upstream of the branch position of the branch line 17 in the pyrolysis gas extraction line 15, and 33 denotes an upstream of the pyrolysis gas fan 32 in the pyrolysis gas extraction line 15. A dust collector provided at the side position (see, for example, Patent Document 3).

JP 11-323359 A JP 2001-271080 A JP 11-141834 A

  However, as shown in Patent Document 1, conventionally, in order to be able to use sludge as a fuel, a drying process is required. However, as described above, it is included in dehydrated sludge. A large amount of heat is required to dry up to 80% of the water until it becomes 10% or less, and if this amount of heat depends on external fuel, a large amount of fuel is required. Further, since the sludge drying exhaust discharged along with the drying of the sludge contains odor in addition to moisture, a deodorizing device for performing a deodorizing process of the sludge drying exhaust, for example, the above-mentioned sludge drying exhaust is 750. A deodorizing device that performs high-temperature treatment by heating to ˜800 ° C. is required separately, and installation costs for the deodorizing device and running costs such as kerosene for raising the temperature of exhaust gas are required.

  On the other hand, as shown in Patent Document 2, when the carbide generated by carbonizing the waste in the waste carbonization furnace is recovered and made into fuel, the carbide taken out from the waste carbonization furnace has a high temperature. Although it is in a state, since it is easy to ignite in this high temperature state, a step of cooling the carbide is required.

  In addition, the carbide recovered from the waste carbonization furnace is in the form of dry powder, so it is easy to scatter as it is, so care must be taken in handling and the working environment should not be deteriorated due to scatter of the carbide. Measures are needed. Furthermore, since it is difficult to form the dried carbide as it is, it is necessary to add water or a chemical (binder) from the outside in order to form it as a solid fuel.

  In addition, the above Patent Document 3 does not describe the idea of converting the carbonized material 12 obtained by pyrolyzing the waste 13 into a solid fuel. Moreover, there is no description regarding the treatment of sludge.

  Therefore, when the present inventor intends to use sludge as fuel, the sludge can be dried without requiring a large amount of external fuel, and the sludge drying exhaust generated during the sludge drying process requires a separate deodorizing device. To cool the high-temperature waste carbide recovered from the waste carbonization furnace when trying to convert the waste carbide such as municipal waste into fuel In addition to making it possible to eliminate the need for water and chemicals without adding water or chemicals from the outside, it is possible to improve the moldability. , Repeated research. As a result, a large amount of heat is required to dry the sludge. On the other hand, waste such as municipal waste can be carbonized by self-heating and there is a surplus in terms of calorific value. While the exhausted sludge exhaust needs to be deodorized, the equipment for carbonizing the waste is usually equipped with a combustion furnace that combusts the combustible pyrolysis gas generated by the carbonization. In addition, water can be used to cool the carbide taken out from the waste carbonization furnace, and the carbide can be moistened by adding water to prevent the carbide from being scattered. While the improvement can be achieved, paying attention to the fact that the sludge originally contains moisture, the amount of heat for drying the sludge is supplied from the carbonization side of the waste, and along with the sludge drying Resulting sludge drying So that the pyrolysis gas recovered from the waste carbonization furnace is combusted and treated at a high temperature, and further, moisture is supplied to the carbide recovered from the waste carbonization furnace from the sludge side. As a result, the inventors have found that any of the above-described objects can be achieved, and have made the present invention.

  Therefore, the object of the present invention is to make the external fuel used for drying the sludge zero or minimal by making the sludge and the waste carbides such as municipal waste into fuel together, and the sludge drying The exhaust odor can be processed without the need for deodorizing equipment. Furthermore, the cooling process of the carbide taken out from the waste carbonization furnace can be eliminated, and the carbide can be prevented from scattering without supplying water or chemicals from the outside. It is an object of the present invention to provide a method and an apparatus for producing a mixed fuel of dried sludge and waste carbide that can improve the formability of the steel.

In order to solve the above problems, the present invention provides a wet dry sludge obtained by drying sludge to a state containing some moisture, and a waste carbide taken out by carbonizing the waste in a waste carbonization furnace. When the waste carbide is cooled with the moisture contained in the wet dry sludge, the waste carbide is wetted, and the moisture contained in the wet dry sludge is generated by the heat of the waste carbide. A dry sludge and waste carbide mixed fuel is produced by forming a mixture of dried sludge and waste carbide by drying so as to further reduce the amount of waste , and then forming the mixture to produce a mixed fuel of dry sludge and waste carbide manufacturing methods, and, a sludge drier for drying the sludge to a state of containing little water, and waste carbonizing furnace for carbonizing waste, be recovered in a state of containing little water from the sludge drier A waste carbide recovered from wet dry sludge and the waste carbonization furnace were mixed by moisture contained in the wet Ri drying sludge, wet the said waste carbide to cool the waste carbide, and the A mixing device that forms a mixture of the dried sludge and the waste carbide by drying so as to further reduce the moisture contained in the wet dry sludge by the heat of the waste carbide , and the dried sludge mixed by the mixing device; waste and molding apparatus for molding the mixture into a desired shape of the carbide, the dried sludge mixed fuel production apparatus of the waste carbide having a constitution comprising a.

  Further, as a heat source for drying sludge, a method of using combustion heat of pyrolysis gas generated when carbonizing waste in a waste carbonization furnace, and a sludge dryer as waste The apparatus has a configuration in which the combustion heat of the pyrolysis gas generated when carbonizing waste in the carbonization furnace is used as a heat source for sludge drying treatment.

  In each of the above-mentioned configurations, the high-temperature heating gas generated by burning the pyrolysis gas generated when carbonizing the waste in the waste carbonization furnace is used for carbonizing the waste. After using the heated gas as a heat source for the carbonization treatment of waste in the externally heated waste carbonization furnace, as an externally heated waste carbonization furnace as a heat source and as a heat source for drying sludge A method for utilizing the heat remaining in the exhaust heating gas discharged from the waste carbonization furnace, and heat generated when the waste carbonization furnace carbonizes the waste in the waste carbonization furnace. An externally heated waste carbonization furnace that uses high-temperature heated gas generated by burning cracked gas as a heat source for carbonization of waste, and further, the sludge dryer is used to dispose of the heated gas as the externally heated type. The carbonization of waste after being used as a heat source for carbonization of waste in a carbonization furnace The heat remaining in the exhaust heating gas more discharged and apparatus configuration in which shall be a heat source for drying the sludge.

  Furthermore, in each of the above-described configurations, a method of supplying the sludge drying exhaust generated when drying the sludge to a furnace for burning the pyrolysis gas generated when carbonizing the waste in the waste carbonization furnace , And a configuration in which sludge drying exhaust generated when drying sludge with a sludge dryer is supplied to a furnace that burns pyrolysis gas generated when carbonizing waste in a waste carbonization furnace Equipment.

According to the present invention, the following excellent effects are exhibited.
(1) when mixing the wet drying sludge comprising dried to a state including some moisture sludge drier sludge, a waste carbide taken by carbonizing waste in waste carbonizing furnace In addition, the waste carbide is cooled by the moisture contained in the wet dry sludge, the waste carbide is wetted, and the moisture contained in the wet dry sludge is further reduced by the heat of the waste carbide. after forming the mixture of waste carbide and drying sludge by drying, as a mixed fuel production method and apparatus for drying sludge and waste carbide to produce a mixed fuel of waste carbide and dry sludge by molding the mixture Therefore, in the sludge dryer, the excessive drying process of sludge can be made unnecessary.
(2) Since the waste carbide recovered from the waste carbonization furnace is wetted as it is mixed with the wet dry sludge, the above-mentioned waste carbide cooling step can be made unnecessary, and the high temperature state can be maintained. The possibility of igniting the waste carbide can be easily and reliably eliminated. Further, it is possible to prevent the powdery waste carbides from being scattered, thereby facilitating handling, and it is possible to eliminate the possibility that the powdery waste carbides are scattered and the working environment is deteriorated. Furthermore, since the waste carbide can be mixed with the wet dry sludge and wetted to improve moldability, the mixture of the dry sludge and waste carbide can be easily formed. Thus, a uniform mixed fuel can be produced by molding with a molding apparatus.
(3) Since the produced mixed fuel contains carbide, it is possible to improve the stability as a fuel as compared with a solid fuel using only sludge as a raw material.
(4) Further, a waste carbonization furnace, an exhaust gas treatment facility provided on the downstream side of the furnace for burning the pyrolysis gas recovered from the waste carbonization furnace, and a wastewater treatment facility in which sludge to be converted into fuel is generated. Since it becomes possible to perform wastewater treatment of plant wastewater generated in the waste carbonization furnace and exhaust gas treatment facility at the wastewater treatment facility, it is necessary to separately provide wastewater treatment equipment for plant wastewater. Can be eliminated.
( 5 ) By using the heat of combustion of the pyrolysis gas generated when carbonizing waste in a waste carbonization furnace as a heat source for drying sludge in a sludge dryer, the above sludge is used. The external fuel required for the drying process can be minimized or minimized.
( 6 ) Using the waste carbonization furnace as a heat source for the carbonization treatment of waste, the high-temperature heating gas generated by burning the pyrolysis gas generated when carbonizing the waste in the waste carbonization furnace The heated gas is used as a heat source for carbonization of waste in the externally heated waste carbonization furnace as an externally heated waste carbonization furnace and as a heat source for drying sludge in a sludge dryer. After that, by using the heat remaining in the exhaust heating gas discharged from the waste carbonization furnace, the amount of heat of the exhaust heating gas exhausted from the external heating type carbonization furnace is reduced. It can be effectively used as a heat source for drying treatment.
( 7 ) Sludge drying exhaust generated when drying sludge with a sludge dryer is supplied to a furnace that burns pyrolysis gas generated when carbonizing waste in a waste carbonization furnace. Thus, the sludge drying exhaust having an odor accompanying the sludge drying treatment can be subjected to a high temperature treatment without requiring a separate deodorizing device.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows an embodiment of a mixed fuel production method and apparatus for dry sludge and waste carbide according to the present invention. Carbon waste 13 such as municipal waste is carbonized to produce pyrolysis gas 11 and waste carbide ( (Hereinafter simply referred to as carbide) 12 and a high temperature generated by burning a pyrolysis gas 11 recovered from the waste carbonization furnace 1 in a required combustion furnace. And a sludge dryer 35 for drying the sludge 34 using gas as a heat source. The sludge drying exhaust 36 discharged from the sludge dryer 35 during the drying process of the sludge 34 in the sludge dryer 35 can be supplied to a required combustion furnace for burning the pyrolysis gas 11. Furthermore, a mixing device 38 and a molding device 39 are provided in this order on the downstream side of the sludge extraction line 37 connected to the sludge dryer 35 and the carbide extraction line 16 for recovering the carbide 12 from the waste carbonization furnace 1. As a result, the sludge dryer 35 uses the combustion heat of the pyrolysis gas 11 as a heat source to make the sludge 34 a wet dry sludge 34a in which some moisture remains, for example, about 10% is dried. The wet sludge 34a and the carbide 12 which is carbonized in the waste carbonization furnace 1 and recovered in a high temperature state from the waste carbonization furnace 1 are mixed by the mixing device 38, and the wetness is obtained. The dry sludge 34a is given heat to the carbide 12 in the high temperature state so that the wet dry sludge 34a is further dried. On the other hand, the carbide 12 in the high temperature state is provided with moisture held by the wet dry sludge 34a to cool and wet the carbide 12 to form a mixture 40 of dried sludge and waste carbide, and then The mixture 40 is molded by the molding device 39 to produce a mixed fuel 41 (hereinafter simply referred to as a mixed fuel) of dried sludge and waste carbide.

  More specifically, the waste carbonization furnace 1 is, for example, an external heat kiln furnace similar to that shown in FIG. A part of the pyrolysis gas 11 recovered from the separation chamber 10 of the external heat kiln furnace 1 to the pyrolysis gas extraction line 15 is attached to the external heat kiln furnace 1 as a combustion furnace. Can be supplied as fuel to the hot-air generating furnace 18 through a branch line 17 branched from the pyrolysis gas take-out line 15. In addition, the high-temperature heating gas 14 generated by burning the pyrolysis gas 11 in the hot air generation furnace 18 is led to the gas inlet 21 of the external heating kiln furnace 1 through the heating gas supply line 20 to the heating flow path 5. By circulating, the waste gas 13 can be indirectly heated using the heated gas 14 as a heat source in the external heat kiln furnace 1 to be carbonized.

  The sludge dryer 35 is, for example, a ventilation-type sludge dryer. The sludge dryer 35 is provided with a gas outlet 26 of the external heat kiln furnace 1 and a heated gas recovery line 27 having a heated gas circulation fan 28. Connect through. Thus, the exhaust gas 14a discharged from the gas outlet 26 after the heated gas 14 is circulated through the heating flow path 5 of the external heat kiln furnace 1 and used as a heat source for carbonization of the waste 13 is heated. The exhaust gas 14a remains in the exhaust gas 14a by being guided to the sludge dryer 35 through the gas recovery line 27 and brought into direct contact with the sludge 34 supplied from the sludge supplier 35a in the sludge dryer 35. As described above, the heat can be used as a heat source for drying the sludge 34 until it becomes wet and dry sludge 34a.

  The hot air generating furnace 18 is connected to an outlet of the sludge drying exhaust 36 in the sludge dryer 35 via an exhaust line 42 having a dryer exhaust fan 43, and an exhaust line branched from the exhaust line 42. 44 is connected to a required combustion furnace 45 provided on the downstream side of the pyrolysis gas extraction line 15. Thereby, the sludge drying exhaust 36 containing the odor discharged from the sludge dryer 35 is circulated to the hot air generating furnace 18 through the exhaust line 42, and the pyrolysis gas 11 is combusted in the hot air generating furnace 18. The high temperature treatment can be performed by the combustion heat at the time of heating. Further, the excess of the sludge dry exhaust 36 can be treated at a high temperature by the combustion heat when the pyrolysis gas 11 is burned together with the auxiliary fuel 46 in the combustion furnace 45 through the exhaust line 44 to the combustion furnace 45. It is like that.

  Of the exhaust heating gas 14 a discharged from the gas outlet 26 of the external heat kiln furnace 1, the surplus that is not supplied to the sludge dryer 35 is located downstream of the heating gas circulation fan 28 in the heating gas recovery line 27. The exhaust line 42 is directly led to a required portion through a further branched bypass line 47.

  48 is a flow rate adjusting valve provided at a position downstream of the branch point of the branch line 17 in the pyrolysis gas take-out line 15, and 49 is a flow rate adjusting valve provided in the branch line 17. By appropriately controlling the above, the supply amount of the pyrolysis gas 11 to the hot air generating furnace 18 can be adjusted. Reference numeral 50 denotes a flow rate adjusting valve provided at a position upstream of the heated gas circulation fan 28 in the heated gas recovery line 27. When the heated gas circulation fan 28 is operated, the flow rate adjustment valve 50 is appropriately adjusted to generate hot air. The flow rate of the heating gas 14 flowing from the furnace 18 to the heating flow path 5 of the external heat kiln furnace 1 can be controlled. 51 is a flow rate adjusting valve provided at a position downstream of the branch line of the bypass line 47 in the heated gas recovery line 27, 52 is a flow rate adjusting valve provided in the bypass line 47, and 53 is the dryer exhaust fan in the exhaust line 42. 43 is a flow rate adjustment valve provided at a position upstream of 43, and by appropriately controlling each of the flow rate adjustment valves 51, 52 and 53, exhaust heat recovered from the external heat kiln furnace 1 to the heated gas recovery line 27 Of the gas 14a, the amount of the exhaust heating gas 14a supplied to the sludge dryer 35 is controlled so that the sludge 34 can be dried by the sludge dryer 35 to obtain the wet dry sludge 34a. The amount of heat applied to the sludge 34 can be adjusted. 54 is a flow rate adjusting valve provided at a position downstream of the branch point of the exhaust line 44 in the exhaust line 42, 55 is a flow rate adjusting valve provided in the exhaust line 44, and the flow rate adjusting valves 54 and 55 are appropriately connected. By adjusting, the circulation amount of the sludge dry exhaust 36 to the hot air generator 18 can be adjusted.

  56 is a sorting device provided at a position near the upstream end of the carbide take-out line 16. The sorting device 56 sorts incombustible materials 57 mixed in the carbide 12 recovered from the external heat kiln furnace 1. It is supposed to be removed. 58 is an exhaust gas treatment facility for treating the combustion exhaust gas discharged from the combustion furnace 45. Other components that are the same as those shown in FIG.

  Due to the above configuration, in the external heat kiln furnace 1, the carbonization treatment by the self-heating of the waste 13 is performed as in the case shown in FIG. 3, and the combustible pyrolysis gas 11 and the carbide 12 are formed. Generated.

  On the other hand, in the sludge dryer 35, the high-temperature heating gas 14 generated by burning part of the pyrolysis gas 11 recovered from the external heat kiln furnace 1 in the hot air generator 18 is generated in the external heat kiln furnace. The sludge 34 is dried using the heat remaining in the exhaust heating gas 14a recovered from the external heat kiln furnace 1 after being used as a heat source for carbonization treatment of the waste 13 in 1 as a heat source.

  The sludge drying exhaust 36 with odor generated in accordance with the drying process of the sludge 34 in the sludge dryer 35 is circulated through the exhaust line 42 to the hot air generating furnace 18 where the pyrolysis gas 11 is combusted, subjected to a high temperature treatment, and an excess amount. Is introduced into the combustion furnace 45 that burns the pyrolysis gas 11 through the exhaust line 44 and is subjected to a high temperature treatment, so that the odor treatment is performed in both the furnaces 18 and 45.

  When the carbide 12 recovered in a high temperature state from the external heat kiln furnace 1 and the wet dry sludge 34a containing some moisture recovered from the sludge dryer 35 are supplied to the mixing device 38 and mixed together, The wet dry sludge 34a is further dried by the heat of the high-temperature carbide 12 and at the same time, the high-temperature carbide 12 is cooled by the water held by the wet dry sludge 34a. Further, the dried powdered carbide 12 is moistened by the moisture of the wet dry sludge 34a to form a mixture 40 composed of the dried sludge and waste carbide.

  Next, the mixture 40 is molded into a required shape by the molding device 39, whereby the mixed fuel 41 having the required shape is produced.

  Thus, according to the method and apparatus for producing a mixed fuel of dried sludge and waste carbide of the present invention, the amount of heat required for the drying treatment of the sludge 34 is combustible pyrolysis generated along with the carbonization treatment of the waste 13. It can be supplied by the combustion heat of the gas 11. Therefore, the external fuel required for the drying process of the sludge 34 can be zero or minimized. Further, the sludge drying exhaust 36 having an odor generated by the drying treatment of the sludge 34 can be subjected to a high temperature treatment without requiring a separate deodorizing device.

  Further, in the sludge dryer 35, the sludge 34 is subjected to a drying process so that a wet dry sludge 34a containing a slight amount of water is obtained on the premise that it is mixed with the carbide 12 in a high temperature state in the mixing device 38 which is a subsequent process. Therefore, excessive drying treatment of the sludge 34 may be unnecessary.

  On the other hand, the carbide 12 recovered in a high temperature state from the external heat kiln furnace 1 can be cooled by mixing with the wet dry sludge 34a, and the cooling step of the carbide 12 can be made unnecessary, and the high temperature. It is possible to easily and reliably eliminate the possibility that the carbide 12 in the state is ignited. Further, since the carbide 12 is wetted as it is mixed with the wet dry sludge 34a, it is possible to prevent the powdered carbide 12 from being scattered and handling becomes easy. It is possible to eliminate the possibility that the working carbide 12 is scattered and the working environment is deteriorated. Furthermore, since the carbide 12 can be mixed with the wet dry sludge 34a and wetted to improve moldability, the mixture 40 of the dry sludge and waste carbide can be easily formed. it can. Therefore, the mixed fuel 41 having a uniform shape can be manufactured by molding with the molding device 39 such as an extrusion molding machine.

  Since the manufactured mixed fuel 41 includes the carbide 12, the stability as a fuel can be enhanced as compared with a solid fuel using only the sludge 34 as a raw material.

  Further, in the exhaust gas treatment facility 58 provided on the downstream side of the combustion furnace 45 that combusts the pyrolysis gas 11 recovered from the external heat kiln furnace 1, plant wastewater is usually generated along with the exhaust gas cleaning treatment or the like. In view of this, if the wastewater treatment facility in which the sludge 34 to be converted to fuel is generated as described above is provided in the external heat kiln furnace 1 or the exhaust gas treatment facility 58, the wastewater from the plant wastewater is disposed. Since the treatment can be performed at the wastewater treatment facility, it is possible to eliminate the need to separately provide a wastewater treatment facility for plant wastewater.

  Next, FIG. 2 shows another embodiment of the present invention. In the same configuration as shown in FIG. 1, a sorting device 56 in the carbide take-out line 16 for collecting the carbide 12 from the external heat kiln furnace 1 is shown. A washing and desalting device 59 and a dehydrator 60 are provided in this order on the downstream side from the upstream side, and recovered from the external heat kiln furnace 1 to the carbide extraction line 16, and then incombustible in the sorting device 56. The carbide 12 from which 57 has been selectively removed is washed with water by the washing and desalting apparatus 59 to remove the salt contained in the carbide 12, and then dehydrated by the dehydrator 60 and then the mixing apparatus 38. To supply to.

  Further, in view of the fact that the carbide 12 supplied to the mixing device 38 is cooled and wetted as it is washed and desalted, in the present embodiment, sludge drying is performed. In the machine 35, the sludge 34 is completely dried or dried so as to leave a very small amount of moisture, and the dried sludge 34b in a state where the absolutely dry or very little moisture is left is recovered from the sludge dryer 35. It can be supplied to the mixing device 38 through the sludge extraction line 37.

  Other configurations are the same as those shown in FIG. 1, and the same components are denoted by the same reference numerals.

  According to the present embodiment, in the mixing device 38, after being collected from the external heat kiln furnace 1, washed in the washing / demineralizing device 59, dehydrated in the dehydrator 60, and in a cooled state and wet. Mixing the carbide 12 in a state with the dry sludge 34b in a state where the moisture is recovered from the sludge dryer 35 or leaving a very small amount of water to form a mixture 40 of the dried sludge and waste carbide, By molding the mixture 40 with the molding device 39, it is possible to produce a mixed fuel 41 having a required shape and less salt.

  Therefore, also in the present embodiment, as in the above embodiment, the amount of heat required for the drying treatment of the sludge 34 is supplied by the combustion heat of the combustible pyrolysis gas 11 generated by the carbonization treatment of the waste 13. Therefore, the external fuel required for the drying treatment of the sludge 34 can be zero or minimized. Further, the sludge drying exhaust 36 having an odor generated by the drying treatment of the sludge 34 can be subjected to a high temperature treatment without requiring a separate deodorizing device.

  Further, in the sludge dryer 35, the sludge 34 may be dried on the premise that it is mixed with the wet carbide 12 in the mixing device 38 which is a subsequent process. However, it may be in a dry state in which a slight amount of moisture remains, so that an excessive drying process can be eliminated.

  Since the carbide 12 recovered from the external heat kiln furnace 1 is in a wet state along with the washing and desalting treatment, the powdered carbide 12 may be scattered after the mixture 40 with the dried sludge 34b is formed. This eliminates the possibility of handling and facilitating the deterioration of the working environment due to scattering of the powdered carbide 12. In addition, since the carbide 12 is mixed with the dried sludge 34b in the mixing device 38 after being in a wet state, the possibility of ignition can be avoided. Furthermore, since the carbide 12 is wet and then mixed with the dried sludge 34b to form the mixture 40, the mixture 40 can be improved in moldability and easy to mold. can do. Therefore, the mixed fuel 41 having a uniform shape can be manufactured by molding with the molding device 39 such as an extrusion molding machine.

  Furthermore, as in the above embodiment, it is possible to increase the stability of the mixed fuel 41 produced as a fuel as compared with a solid fuel using only the sludge 34 as a raw material. If the wastewater treatment facility in which the sludge 34 is generated is attached to the external heat kiln furnace 1 and the exhaust gas treatment facility 58 so that the wastewater treatment of the plant wastewater discharged from these facilities is performed, the wastewater for the plant wastewater is discharged. It becomes possible to eliminate the need to provide a separate processing facility.

  The present invention is not limited only to the above-described embodiment, and the external heat kiln furnace 1 is shown as the waste carbonization furnace, but the waste 13 is carbonized in a low oxygen atmosphere to form the carbide 12 The combustible pyrolysis gas 11 can be recovered, and the high-temperature heating gas 14 generated by burning the recovered pyrolysis gas 11 can be used as a heat source for carbonizing the waste 13. The waste heat gas 14a after being supplied to the heat source for carbonizing the waste 13 in the waste carbonization furnace is supplied to the sludge dryer 35. Any type of externally heated waste carbonization furnace other than the external heat kiln furnace 1 may be adopted as the waste carbonization furnace as long as it can be supplied as a heat source for the sludge 34 drying treatment. Further, in each of the above embodiments, as the heat source for drying treatment of the sludge 34 in the sludge dryer 35, the heating gas 14 generated by burning the pyrolysis gas 11 in the hot air generator 18 is used in the external heat kiln furnace 1. Although it has been shown that the heat remaining in the exhaust gas 14a after being used as a heat source for carbonization of the waste 13 is used, the combustion heat of the pyrolysis gas 11 can be supplied to the sludge dryer 35. If there is, for example, as shown by a two-dot chain line in FIG. 1, the combustion exhaust gas generated when the pyrolysis gas 11 recovered from the external heat kiln furnace 1 is burned in the required combustion furnace 45 is directly supplied to the sludge dryer 35. You may make it guide. Furthermore, when a partial combustion type carbonization furnace is adopted as the waste carbonization furnace, the combustible pyrolysis gas 11 recovered from the partial combustion type carbonization furnace is burned in the required combustion furnace. The combustion heat generated in the above may be guided to the sludge dryer 35 in the form of high-temperature combustion exhaust gas and used as a heat source for drying the sludge 34, for example.

  The sludge dryer 35 is shown as a ventilation type, but may be an external heating type. In this case, a waste carbonization furnace such as a hot air generator 18 or a combustion furnace 45 in which the gas containing water vapor (moisture) and odor discharged from the external heat sludge dryer is attached to the external heat kiln furnace 1. What is necessary is just to guide to the combustion furnace which burns the pyrolysis gas 11 recovered more and to carry out high temperature processing.

  Of course, various changes can be made without departing from the scope of the present invention.

1 is a schematic diagram showing an embodiment of a method and apparatus for producing a mixed fuel of dried sludge and waste carbide according to the present invention. It is a schematic diagram which shows the other form of implementation of this invention. It is a schematic diagram which shows an external heat kiln furnace as an example of the waste carbonization furnace proposed conventionally.

Explanation of symbols

1 External heat kiln furnace (waste carbonization furnace)
DESCRIPTION OF SYMBOLS 11 Pyrolysis gas 12 Waste carbide 13 Waste 14 Heated gas 14a Exhaust heated gas 18 Hot-air generator (furnace)
34 Sludge 34a Wet dry sludge 34b Dry sludge 35 Sludge dryer 36 Sludge drying exhaust 38 Mixing equipment 39 Molding equipment 40 Mixture of dry sludge and waste carbide 41 Mixed fuel of dry sludge and waste carbide 45 Combustion furnace
59 Washing and desalting equipment 60 Dehydrator

Claims (8)

When mixing wet dry sludge obtained by drying sludge to a state containing some moisture and waste carbide extracted by carbonizing waste in a waste carbonization furnace, the wet dry sludge is mixed into the wet dry sludge. Dry waste sludge is cooled by cooling the waste carbide with the contained moisture and drying the waste carbide by heat so that the moisture contained in the wet dry sludge is further reduced by the heat of the waste carbide. and after forming the mixture of waste carbides, mixed fuel production method for drying sludge and waste carbide, characterized in that to produce a mixed fuel of waste carbide and dry sludge by molding the mixture. As a heat source for drying the sludge, mixed waste carbide and dry sludge according to Claim 1 so as to utilize the heat of combustion of the pyrolysis gas generated during the carbonization of waste in waste carbonizing furnace Fuel production method. An external heating type in which a high-temperature heating gas generated by burning a pyrolysis gas generated when carbonizing waste in the waste carbonization furnace is used as a heat source for carbonization of waste As a heat source for drying sludge, and using the heated gas as a heat source for carbonization of waste in the externally heated waste carbonization furnace, from the waste carbonization furnace The method for producing a mixed fuel of dried sludge and waste carbide according to claim 1 or 2, wherein the heat remaining in the exhausted heated gas discharged is utilized. Sludge drying exhaust generated when drying the sludge, waste in the carbonization furnace waste according to claim 1, wherein so as to supply to the furnace for burning the pyrolysis gas generated during the carbonization A mixed fuel manufacturing method of dry sludge and waste carbide. Sludge dryer for drying sludge to a state containing some moisture , waste carbonization furnace for carbonizing waste, wet dry sludge recovered in a state containing some moisture from the sludge dryer, and the above a waste carbide recovered from waste carbonization furnace were mixed by moisture contained in the wet Ri drying sludge, wet the said waste carbide to cool the waste carbide, and has a said waste carbide A mixing device that forms a mixture of dry sludge and waste carbide by drying so that the moisture contained in the wet dry sludge is further reduced by heat , and a mixture of dry sludge and waste carbide mixed by the mixing device the mixed fuel production apparatus of the waste carbide and drying sludge; and a molding apparatus for molding, comprising a structure to the required shape. The dried sludge and waste according to claim 5 , wherein the sludge dryer uses the heat of combustion of the pyrolysis gas generated when carbonizing the waste in the waste carbonization furnace as a heat source for sludge drying treatment. Carbide mixed fuel production equipment. An external heating type in which a high-temperature heating gas generated by burning a pyrolysis gas generated when carbonizing waste in the waste carbonization furnace is used as a heat source for carbonization of waste Further, the sludge dryer is discharged from the waste carbonization furnace after the heated gas is used as a heat source for carbonization of waste in the externally heated waste carbonization furnace. The apparatus for producing a mixed fuel of dried sludge and waste carbide according to claim 5 or 6, wherein the heat remaining in the exhaust gas is used as a heat source for sludge drying treatment. The sludge drying exhaust generated when the sludge is dried by the sludge dryer is supplied to a furnace for burning the pyrolysis gas generated when carbonizing the waste in the waste carbonization furnace , 8. A device for producing a mixed fuel of dried sludge and waste carbide according to 6 or 7 .

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