JP2000283437A - Method and system for treating waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the energy utilizing efficiency of refuse by a method wherein a treatment amount per unit time of waste is increased by removing a chlorine content from waste. SOLUTION: By burning char (carbine) T through carbonization of waste H, the waste H is treated. A method described above comprises a solution separation process wherein the char T is placed in a given solution in a chlorine removing device 1 and a chlorine content of the char T is dissolved in a given solution, and by separating the given solution from a mixture M of the char T and the given solution by a solution separating device 2, dechlorined char (dechlorined carbide) K is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a system for treating waste by carbonizing the waste and burning the carbide in a coal-fired boiler or a coal gasification facility of a thermal power plant, for example. In particular, the present invention relates to a technique of burning in a state where a part of chlorine contained in waste is removed. In this specification, waste is used to include municipal waste such as paper and waste plastic, and biomass-based industrial waste such as straw, wood chips and waste pulp.

[0002]

2. Description of the Related Art In recent years, it has been proposed to reuse municipal waste such as paper and waste plastic, and biomass-based industrial waste such as straw, wood chips and waste pulp as various fuels. It is expected that the energy utilization efficiency of the product will increase. For this reason, boiler power generation using a garbage incinerator has also been proposed, but hydrogen chloride generated during garbage incineration corrodes the boiler tubes, making it impossible to operate the boiler under severe conditions, and the garbage contains a lot of moisture. Therefore, the power generation efficiency is poor due to the low combustion temperature.
Furthermore, disposal of ash generated by garbage incineration requires enormous costs and is not economical.

[0003] Therefore, it is conceivable to use the waste as fuel for a coal-fired business boiler or a coal gasification facility already installed in a thermal power plant, thereby eliminating the need for an incinerator for waste treatment. However, it is difficult to put waste directly into such commercial boilers. This is because commercial boilers and the like are difficult to directly burn waste due to the structure of the burner and the like, and the quality of fuel is strictly controlled to control exhaust gas and prevent corrosion of boiler tubes. The problem is that it is not possible to deal with unstable urban garbage.

Japanese Patent Application Laid-Open No. Hei 10-244176 discloses a technique in which organic waste such as waste plastic is used as fuel for a coal-fired boiler. This is because the organic waste is previously stored in an oxygen-deficient atmosphere for 200 to 50 days.
Heat treatment in a temperature range of 0 ° C., the gas generated by this heat treatment is burned in a boiler, and after the heat treatment, solids (so-called carbides mainly composed of carbon) pulverized by a roller mill are mixed with coal as fuel. And burn it in a boiler.

[0005]

By the way, in the above-mentioned waste, chlorine existing in a high molecular chlorine resin such as vinyl chloride and chlorine existing in sodium chloride and calcium chloride are included. Yes (the former is referred to as organic chlorine and the latter is referred to as inorganic chlorine for the sake of convenience in the present specification), and it can be considered that these organic chlorine and inorganic chlorine are present in a ratio of about half. The pyrolysis gas generated in the process of heat treatment of the waste, that is, carbonization by pyrolysis, contains 80 to 90% of the organic chlorine as hydrogen chloride, and this pyrolysis gas is used for business such as thermal power plants. If a large amount is burned in a boiler or the like, the burner may malfunction or the boiler tube may be corroded, so that only a small amount can be burned.

On the other hand, the carbides obtained after the heat treatment of wastes are similar in properties such as the calorific value, specific moisture, and volatility to coal, so that, for example, a fuel such as an existing coal-fired boiler for a thermal power plant is used. It is possible to mix in and burn. However, most of the inorganic chlorine remains in the carbonized waste, and although the properties such as the calorific value are similar to coal, they differ in that they contain much more chlorine than coal. I have. Therefore, if this carbide is used as fuel for a commercial boiler, the same causes the malfunction of the burner and the corrosion of the boiler tube as described above, so that it can be mixed into the coal little by little.

[0007] As described above, in view of the fact that chlorine has a great effect on fuel whose quality is strictly controlled, such as a boiler for a coal-fired business, waste is subjected to heat treatment, and the heat treatment process is performed. In order to properly burn the pyrolysis gas and carbide generated in the above in a commercial boiler, waste (pyrolysis gas and carbide) should be mixed with coal in order to avoid malfunction of the burner and corrosion of the boiler tube. Just one
%, And the chlorine content in the whole must be made very small. As a result, the amount of waste processed per unit time is reduced, and the above-described improvement in the energy use efficiency of garbage cannot be achieved.

Further, since chlorine is contained in exhaust gas after combustion in a commercial boiler, it is necessary to add a chlorine removal function to an exhaust gas treatment facility in order to satisfy exhaust gas regulations. However, adding a chlorine removal function to a large exhaust gas treatment facility in order to remove a small amount of chlorine contained in the exhaust gas is not preferable in terms of cost. In addition, dust generated in the process of treating flue gas from a coal-fired boiler can be reused on the premise that it can be obtained by burning only coal. Such as the need to remove chlorine from dust,
This will reduce the value of dust recycling.

The technique disclosed in Japanese Patent Application Laid-Open No. Hei 10-244176 discloses a so-called dry pulverization process in which carbide and coal are pulverized by a roller mill. It is configured to carry up to. However, in such a dry pulverization process, since the specific gravity of the carbide is smaller than that of the coal, the carbide having a large particle size is mixed with the pulverized coal in the pulverization process and rides on the carrier gas, and the carbide and the coal are separated. There is a problem that both are in the form of fine powder and it is difficult to send them to the boiler in an appropriate mixed state.

[0010] Further, it is conceivable that not all of the carbonized waste is sent to a boiler or the like as it is generated, but is temporarily transported to a hopper or the like where it is stored and then taken out by an appropriate amount and supplied to the boiler. . In such a case, since the carbide is also high in temperature immediately after the generation of the carbide, if the material is transported and stored in a hopper or the like at a high temperature, the carbide may be ignited. It is necessary to handle the cooled carbide after cooling it to some extent, and the processing efficiency is deteriorated.

[0011] The present invention solves the above problems, and removes the chlorine content from the carbonized waste and then burns it in a commercial boiler, coal gasification facility, etc., and puts it into a commercial boiler, etc. The amount of chlorine is reduced, thereby increasing the amount of waste processed per unit time and improving the energy use efficiency of garbage. The purpose is to improve the ease of handling during storage.

[0012]

In order to achieve the above object, the invention according to claim 1 is a method of treating waste by carbonizing waste and burning the carbide, comprising the steps of: And a solution separation step of separating a predetermined solution from a mixture of the carbide and the predetermined solution to generate a dechlorinated carbide. Is adopted. In this waste treatment method, inorganic chlorine (chlorine content) is removed from the carbonized waste to produce dechlorinated carbide, which is burned. For example, the dechlorinated carbide is mixed with coal to generate thermal power. Even when burning in a commercial boiler or coal gasification facility for the equipment, inorganic chlorine contained in the carbide is not injected into the commercial boiler, etc. It can be burned, thereby increasing the amount of waste per unit time and improving the efficiency of energy utilization of garbage. further,
Since the chlorine content in the carbide is removed by dissolving it in the predetermined solution, at least a part of the chlorine content contained in the waste is efficiently removed. In addition, since the dechlorinated carbide is in a wet state after the predetermined solution is separated in the solution separation step, it is difficult to ignite even if the dechlorinated carbide is transported and stored in a hopper or the like, and the handleability of the carbide is improved. Becomes possible.

According to a second aspect of the present invention, in the waste disposal method of the first aspect, prior to the chlorine removing step, a technique of pulverizing a carbide in advance is applied. In this waste treatment method, the carbide is pulverized in advance and reduced in diameter or pulverized before the chlorine removal step, so that in the chlorine removal step, the surface area of the carbide with respect to a predetermined solution is increased, and thus the carbon is contained in the carbide. The chlorine content is easily dissolved in the predetermined solution, and the chlorine removal efficiency can be improved.

The invention according to claim 3 is the invention according to claim 1 or 2
In the waste treatment method, a technique is used in which a predetermined solution separated in the solution separation step is used as a predetermined solution in the chlorine removal step. In this waste treatment method, the predetermined solution separated in the solution separation step is used again as the predetermined solution in the chlorine removal step, and the predetermined solution is circulated in the solution separation step and the chlorine removal step. Efficiency can be improved and processing costs can be reduced, such as by reducing the amount of processing of the predetermined solution separated in the solution separation step.

According to a fourth aspect of the present invention, in the waste disposal method of the third aspect, the concentration of chlorine dissolved in the predetermined solution is detected, and when the detection result exceeds a predetermined value, the chlorine content is removed from the predetermined solution. A technique for performing a separation process is applied. In this waste treatment method, the chlorine concentration in the predetermined solution is monitored while the predetermined solution is circulated in the solution separation step and the chlorine removal step, and when the chlorine concentration exceeds the predetermined value, the chlorine content of the predetermined solution is reduced. Since the separation treatment is performed, it is possible to prevent the circulating predetermined solution from dissolving the chlorine content in the carbide beforehand and to prevent the continuous treatment of the waste from being hindered. In addition, it is possible to easily cope with automation of waste disposal.

According to a fifth aspect of the present invention, there is provided a system for treating a waste by carbonizing the waste and burning the carbide, wherein the system has a predetermined solution into which the carbide is introduced and determines a chlorine content of the carbide. A technology including a chlorine removing device that dissolves in a solution and a solution separating device that separates a predetermined solution from a mixture of the carbide and the predetermined solution discharged from the chlorine removing device to generate a dechlorinated carbide is employed. In this waste treatment system, inorganic chlorine (chlorine) is removed from the carbonized waste by a chlorine removal device, and dechlorinated carbide is generated by a solution separation device. When mixed with a commercial boiler or a coal gasification facility for thermal power generation equipment, the inorganic chlorine contained in the carbide is not injected into the commercial boiler, etc. It can be burned in a boiler or the like, thereby increasing the amount of waste processed per unit time and improving the energy use efficiency of garbage. Further, since the chlorine content in the carbide is removed by dissolving it in a predetermined solution in the chlorine removing device, at least a part of the chlorine content contained in the waste is efficiently removed. In addition, since the dechlorinated carbide is in a wet state even after the predetermined solution is separated in the solution separation device, it is difficult to ignite even if the dechlorinated carbide is transported and stored in a hopper or the like, and the handling property of the carbide is improved. It can be improved.

According to a sixth aspect of the present invention, in the waste disposal system of the fifth aspect, a technique light receiving opening T provided with a crusher for previously crushing the carbide put into the predetermined solution is applied. In this waste treatment system, the carbide to be supplied to the predetermined solution of the chlorine removing device is preliminarily pulverized by a pulverizer to reduce the diameter or fineness of the carbide, so that in the chlorine removing device, the surface area of the carbide with respect to the predetermined solution is increased, Thereby, the chlorine content contained in the carbide is easily dissolved in the predetermined solution, and the efficiency of removing the chlorine content can be improved.

The invention according to claim 7 is the invention according to claim 5 or 6.
In the waste treatment system of (1), a technique including a circulation path for sending a predetermined solution separated by a solution separating device to a chlorine removing device is applied. In this waste treatment system, the predetermined solution separated by the solution separation device via the circulation path is used again as the predetermined solution of the chlorine removal device, and the predetermined solution is circulated by the solution separation device and the chlorine removal device. It is possible to improve the utilization efficiency of the predetermined solution and to reduce the processing cost such as the reduction of the processing amount of the predetermined solution separated by the solution separation device.

According to an eighth aspect of the present invention, in the waste disposal system of the seventh aspect, a sensor for detecting a concentration of chlorine dissolved in the predetermined solution, and a predetermined solution when a detection result from the sensor exceeds a predetermined value. A technology including a separation treatment device for performing a separation treatment of chlorine from water is applied. In this waste treatment system, the chlorine concentration in the predetermined solution is monitored by a sensor while the predetermined solution is circulated through the solution separation device and the chlorine removal device, and when the chlorine concentration exceeds a predetermined value, the separation treatment device is used. Prevents the circulating solution from dissolving the chlorine in the carbides before performing the separation process of the chlorine content from the solution to prevent the continuous treatment of waste from being hindered. Becomes possible. In addition, it is possible to easily cope with automation of waste disposal.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The waste treatment system shown in FIG.
It burns char (carbide) of municipal waste such as paper and waste plastic, and biomass-based industrial waste (waste in the present specification) such as straw, wood chips and waste pulp. FIG. 1 shows a flow chart of the waste treatment, and solid arrows indicate flows of solids or fluids. The waste treatment system includes carbide producing apparatuses X1 and X2 (including X1a and X2a), a chlorine removing apparatus 1, a solution separating apparatus 2, and a carbide burning apparatus Y1 and Y2.
It is roughly composed of

The char (carbide) T produced from the waste H by one or both of the carbide producing devices X1 and X2 is first introduced into the crusher 3 and crushed. This is to increase the surface area of the char T that is put into the predetermined solution in the chlorine removing device 1 described below in the form of fine powder so as to come into contact with the predetermined solution, so that the chlorine component contained in the char T can be easily dissolved. However, depending on the carbide producing device, the char T to be produced may be in the form of fine powder, and such a carbide producing device (for example, FIG. 4 or FIG.
Is used, the crusher 3 is not required. In addition, chlorine removal device 1
However, when a function of crushing the char T in a state where the char T is put in a predetermined solution is provided, it is unnecessary to separately install the crusher 3.

Then, the char T formed into a fine powder by the pulverizer 3 is sent to the chlorine removing device 1. Chlorine removal device 1
Is provided with a storage tank 4 for storing a predetermined solution such as water and a stirring device 5 for stirring the inside of the storage tank 4. The fine powdered char T is put into the water in the storage tank 4 and stirred by the stirring device 5 for a predetermined time. You. However, various solutions that can dissolve inorganic chlorine other than water are used as the predetermined solution. Whether or not the stirrer 5 is installed is optional. For example, the char T is stored in the storage tank 4.
It may be one that is simply thrown into the tank or one that causes the char T to convect with the water in the storage tank 4.

Incidentally, it has been described above that organic chlorine such as vinyl chloride and inorganic chlorine are present in the waste H in a ratio of about half. And 80 ~ of organic chlorine
90% of waste H as hydrogen chloride during the production process of char T
However, most of the inorganic chlorine remains in the char T without being decomposed. Since the inorganic chlorine is sodium chloride or calcium chloride, the chlorine content of the char T is dissolved in the water by putting the char T in water, and as a result, the chlorine content is removed from the char T. (Chlorine removal step).

Specifically, in the storage tank 4, when the char T is mixed with water at a ratio of 1 to 15 or more and the mixture is stirred for about 10 minutes at room temperature by the stirring device 5, about 68%
It was confirmed that the inorganic chlorine was dissolved in water and was removed from the char T. Furthermore, when the stirring time was about 60 minutes, about 81% of the inorganic chlorine was dissolved in the water and removed from the char T. It was confirmed that it would be. In the present invention, the stirring time is optional, and of course, the stirring time changes when water other than water is used as the predetermined solution.

After the chlorine content of the char T is dissolved in the water in the chlorine removing device 1, the mixture M of the water and the char T is sent to the solution separating device 2. The mixture M is added to the solution separator 2.
As a mode of sending, a batch type in which a part or all of the inside of the storage tank 4 is collectively sent to the solution separation device 2, or the mixture M is continuously fed while the water and the char T are continuously charged into the storage tank 4. Any of a continuous type that sends the separation device 2 may be used. The solution separation device 2 generates dechlorinated char (dechlorinated carbide) K by dehydrating the mixture M (solution separation step), and for example, a filter press or the like is used. However, the solution separator 2 is not limited to a filter press, but may be, for example, a centrifuge.

On the other hand, the water separated from the char T in the solution separating device 2 is returned to the storage tank 4 of the chlorine removing device 1 via the circulation path 6 again. At this time, the sensor 7 is installed in the middle of the circulation path 6 to detect the salt concentration (chlorine concentration) of the water,
When the salt concentration is lower than the predetermined value, the salt is returned to the storage tank 4 as it is, and when the salt concentration exceeds the predetermined value, the salt is sent to the separation processing device 8.

However, the treatment of the water separated by the solution separation device 2 is optional. For example, without monitoring the salt concentration with the sensor 7, the water is separated by, for example, 50 to 50 in the above-mentioned batch processing.
After using 200 times, in a continuous process, after a predetermined time has passed, water is sent to the separation treatment device 8 and fresh water is stored in the storage tank 4.
It may be made to supply to. Further, the water separated by the solution separation device 2 may always be sent to the separation processing device 8 without providing the circulation path 6. The separation processing device 8
A type is used in which the dissolved salt is removed by evaporating water.

Further, for example, the chlorine removing apparatus 1 and the solution separating apparatus 2 shown in FIG.
1a and X2a), the water separated by the solution separation device 2 is not passed through the separation treatment device 8 and the chlorine removal devices 16 and 2 of the carbide production devices X1 and X2 are installed.
6 (in X1a and X2a, chlorine removing devices 20 and 30) can be used as cooling water for a gas cooling tower. In this case, the salt dissolved in the water is taken out as gas-cooled tower ash.

The dechlorinated char K produced in the solution separation device 2 is burned in one or both of the carbide combustion devices Y1 and Y2 either as it is or in a state of being slurried by mixing with water. Once stored in the hopper 9, it is put into the carbide combustion device Y1 or the like and burned. Since 60 to 80% of the inorganic chlorine is removed from the dechlorinated char K, if the amount of chlorine that can be put into the carbide combustion device Y1 or the like is determined, the untreated char T and the untreated char T In comparison, more inorganic chlorine can be burned.

In addition, in the carbide production apparatus X1 or the like, during the production process of the char T, 80 to 9 organic chlorine is removed from the waste H.
Since 0% is omitted, the processing amount of the waste H per unit time becomes 4 to 5 times as compared with the related art, and the energy use efficiency of garbage can be improved. Further, since the dechlorinated char K is in a wet state even after water is separated, it is extremely unlikely that it will ignite when transported to the carbide combustion device Y1 or the like or when stored in the hopper 9. .

Next, the carbide producing apparatuses X1 and X1 shown in FIG.
2 and the carbide combustion devices Y1 and Y2 will be described. FIG. 2 shows a flow chart of carbide production in the carbide production apparatus X1, in which the solid arrows represent the flow of solids and the dotted arrows represent the flow of gas. As shown in FIG.
Is first charged into the crusher 10 and crushed. At this time, the waste H is crushed to about 150 mm or less in order to increase the thermal efficiency in the later-described pyrolysis furnace 12. Then, the crushed waste H is introduced into the dryer 11 and dried (removing water) efficiently, and then sent to the pyrolysis furnace 12.

Usually, the waste H contains about 30% to 60% of water.
%, It is preferable to remove moisture from the waste H by the dryer 11 in a short time in order to prevent the thermal decomposition efficiency from being reduced by moisture. However, if waste H having a relatively small water content is to be treated,
It can be naturally dried or can be directly charged into the pyrolysis furnace 12, and it is optional whether or not the waste H crushed in the carbide manufacturing apparatus X1 is dried by the dryer 11.

As the thermal decomposition furnace 12, for example, an externally heated rotary kiln is used. This externally heated rotary kiln is composed of an outer cylinder rotatably supported and an inner cylinder installed in the outer cylinder with a predetermined gap therebetween. In the set state, the waste gas H supplied into the inner cylinder is indirectly heated by supplying the combustion gas into the gap. At this time, the outer cylinder and the inner cylinder are rotating at a predetermined speed, and this rotation causes the waste H in the inner cylinder to roll inside the inner cylinder while being heated, thereby avoiding the occurrence of uneven heating. Furthermore, it is further crushed by the impact of rolling.

The pyrolysis furnace 12 is not limited to the externally heated rotary kiln, but may be any of various types capable of heating the waste H in an oxygen-free or oxygen-deficient atmosphere. For example, a so-called continuous processing type such as a type in which a plurality of pipes are arranged in an inner space of a cylindrical body and a combustion gas is supplied to heat the inside of the cylindrical body, or a predetermined amount of waste using a combustion furnace. What is called a batch type in which heating is performed one by one may be used.

The waste H is thermally decomposed into a flammable pyrolysis gas S and a char (carbide) T by being heated in an oxygen-free or oxygen-deficient atmosphere. It has been described above that in the waste H, the organic chlorine such as vinyl chloride and the inorganic chlorine such as sodium chloride are present in approximately half the ratio. Then, 80 to 90% of the organic chlorine is contained in the pyrolysis gas S as hydrogen chloride, while the inorganic chlorine remains in the char T without being decomposed even after the heat treatment. ing.

The char T discharged from the pyrolysis furnace 12 is
After being sent to the sorting device 13 to remove incombustibles, it is sent to the storage tank W and stored. The sorting device 13 removes non-combustible substances such as aluminum cans, iron cans, rubble, and metal wires mixed in the waste H from the char T. Sorting device 13
As an example, the char T is supplied onto a sorting portion having a predetermined gap, and the char T is carbonized by pyrolysis.
Is dropped down from the gap, while a non-combustible material such as an aluminum can is stored in the gap. Further, in the sorting device 13, the removed incombustibles can be sorted for each valuable metal. However, if it is clear that there is no noncombustible material in the waste H, the sorting device 13 is not necessarily required.

The pyrolysis gas S discharged from the pyrolysis furnace 12
Is sent to the gas processing device 14. Gas treatment device 14
Is the fine powdered char T1 mixed in the pyrolysis gas S
A dust collector (such as a cyclone) for removing ash. Further, a function of separating and removing the pyrolysis gas S and its oil component can be added as the gas processing device 14. The separated oil component is used as various fuels such as burners.

The gas processing unit 14 has a buffering role to reduce the influence of the downstream equipment due to the fluctuation of the quality of the waste H. The gas processing unit 14 separates the fine powdery char T mixed in the pyrolysis gas S, Since the decomposed gas S is burned, it is possible to avoid the influence of the char T during the combustion of the thermally decomposed gas S. In addition, the char T1 taken out by the gas processing device 14
Is substantially the same as the char T, and the sorting device 13
The char generated from the pyrolysis furnace 12 can be efficiently taken out by merging with the char T from the furnace. However, the installation of the gas treatment device 14 is optional, and is not always necessary if the downstream combustion device 15 can tolerate the mixing of the fine powdery char T1 and the quality fluctuation of the waste H.

The pyrolysis gas S processed by the gas processing device 14 is sent to a combustion device 15 and burned to generate a combustion gas (hot air). The combustion device 15 burns the pyrolysis gas S with a burner to generate a combustion gas G.
This combustion gas G is supplied to the pyrolysis furnace 12 and the waste H
Is a heat source for heating the heat. The combustion gas G other than the amount required as a heat source of the pyrolysis furnace 12 is not sent to the pyrolysis furnace 12 as surplus gas Y, but is combined with the combustion gas G discharged from the pyrolysis furnace 12. The surplus gas Y is used as a heat source for the dryer 11 and other auxiliary devices. This eliminates the need for a heat source for the apparatus such as the dryer 11 and can reduce the cost of the system. However, the surplus gas Y is supplied to the dryer 1
Instead of being used as a heat source for the first and the like, it may be sent to the downstream chlorine removing device 16.

Further, since the organic chlorine of the pyrolysis gas S is converted into hydrogen chloride after combustion and contained in the combustion gas G, if this combustion gas G is supplied to the pyrolysis furnace 12, the pyrolysis furnace 1
2 may cause deterioration such as corrosion. Therefore, the combustion device 15
A heat exchanger may be installed on the downstream side of the heat exchanger to exchange heat between the combustion gas G and, for example, air by the heat exchanger, and supply the heated air to the pyrolysis furnace 12. This makes it possible to prevent the pyrolysis furnace 12 from being affected by the chlorine content. The air discharged from the pyrolysis furnace is released to the atmosphere.

However, the object of heat exchange with the combustion gas G is not limited to air, and a fluid such as oil may be used. In this case, the oil and the like heated by the heat exchanger are supplied to the pyrolysis furnace 12, and the oil and the like discharged from the pyrolysis furnace 12 are sent to the heat exchanger and exchanged with the combustion gas G again to perform pyrolysis. A fluid circulation path such as being sent to the furnace 12 may be formed.

The combustion gas G and surplus gas Y discharged from the pyrolysis furnace 12 are sent to a chlorine removing device 16. Combustion gas G and surplus gas Y (hereinafter referred to as combustion gas G etc.)
Contains 80 to 90% of organic chlorine and cannot be released to the atmosphere as it is. The chlorine removal device 16 includes a slaked lime charging device 17, a dust collector 18 such as a cyclone, a gas cooling tower (not shown), and the like. The slaked lime charging device 17 adds slaked lime to the combustion gas G and the like to remove chlorine. Calcium chloride is used as the downstream dust collector 1
At 8, chlorine is removed from the combustion gas G and the like.

However, the chlorine removing device 16 is not limited to this, and various devices capable of removing chlorine from the combustion gas G or the like are applied. The combustion gas G and the like from which the chlorine content has been removed by the chlorine removing device 16 are treated by a denitration device 19 or the like so as to conform to exhaust gas regulations and the like, and then released into the atmosphere. In addition, a carbide combustion device Y described later
In the case where the exhaust gas treatment devices 35 and 46 provided in the Y1 and Y2 have a dechlorination function, the combustion gas G and the like are directly sent to the exhaust gas treatment devices 35 and 46, where chlorine is removed and then released to the atmosphere. You may. As a result, the chlorine removing device 16 is not required, the system is simplified, and the cost can be reduced.

FIG. 3 shows a carbide production apparatus X1a having a partly different form from that of the carbide production apparatus X1, and the parts denoted by the same reference numerals as those in FIG. 2 are the same as those shown in FIG.
Description is omitted. The difference from FIG.
Is sent to the chlorine removal device 20,
The point is that the organic chlorine contained in the pyrolysis gas S is removed to obtain a dechlorinated pyrolysis gas D.

The chlorine removing device 20 includes a slaked lime charging device 21
And a dust collector 22 such as a cyclone, a gas cooling tower (not shown), and the like. Slaked lime is added to the pyrolysis gas S by the slaked lime charging device 21 to convert chlorine into calcium chloride, which is then collected in a downstream dust collector. Pyrolysis gas S collected by the vessel 22
To remove dechlorinated pyrolysis gas D. However, the chlorine removing device 20 is not limited to this, and various devices capable of removing chlorine from the pyrolysis gas S are applied.

The dechlorinated pyrolysis gas D generated in the chlorine removing unit 20 is burned in a commercial boiler 34 and an exhaust heat recovery boiler 43 provided in the carbide burning units Y1 and Y2, and is used as a heat source and burned. It is sent to the device 15 and burned to generate a combustion gas (hot air) G. As described above, the cost can be reduced by using the dechlorinated pyrolysis gas D as a heat source of the commercial boiler 34 and the like. In addition, since the organic chlorine is removed from the dechlorinated pyrolysis gas D, the influence of corrosion of the boiler tube and malfunction of the burner is small. Further, in the carbide production device X1a, the exhaust gas discharged from the commercial boiler 34 and the like also emits carbide combustion devices Y1, Y
2 can be directly processed by the existing exhaust gas processing devices 35 and 46.

It is optional whether or not part of the dechlorinated pyrolysis gas D is burned and supplied to the pyrolysis furnace 12, and all of the dechlorinated pyrolysis gas D is supplied to the carbide combustion devices Y1 and Y2. May be supplied. Further, the point that the combustion gas G can be used as a heat source of the dryer 11 or the like is the same as in the carbide manufacturing apparatus X1 of FIG. Further, instead of the dechlorinated pyrolysis gas D, the pyrolysis gas S before processing in the chlorine removal device 20 or a part of the pyrolysis gas S before processing in the gas processing device 14 may be burned in the combustion device 15. Good. In this case, since the combustion gas G contains chlorine, it is necessary to remove chlorine (hydrogen chloride) from the combustion gas G. However, the carbide combustion device Y1,
When the exhaust gas treatment devices 35 and 46 provided in Y2 have a dechlorination function, the combustion gas G is directly supplied to the exhaust gas treatment device 3
5, 46, where the chlorine may be removed and then released to the atmosphere.

Then, the char T (including T1) produced by the carbide producing apparatus X1, X1a shown in FIGS. 2 and 3
Is taken out from the storage tank W by a predetermined amount and sent to the pulverizer 3 shown in FIG.
And sent to the carbide combustion device Y1 and the like with the inorganic chlorine removed. However, whether or not the char T is stored in the storage tank W is optional. For example, the char T can be directly charged into the crusher 3. Also, as described above, if the char T is already in the form of fine powder, it is not necessary to grind it with the grinder 3.

As described above, the carbide producing apparatuses X1 and X1a
80-90% of the organic chlorine in the waste H is removed, and the char T
From the wastewater H, the majority of the chlorine present in the waste H is removed, and then the carbide combustion device Y is removed.
By being charged into 1 or the like, more waste H can be treated as compared with the conventional case.

FIG. 4 shows a flow chart of the production of carbide in the carbide production apparatus X2, where solid arrows indicate flows of solids and dotted arrows indicate flows of gases. Waste H is
As in FIG. 2, it is charged into a crusher 10 and crushed to about 150 mm or less in order to increase thermal efficiency in a gasifier 23 described later. Then, the crushed waste H is supplied to the dryer 1
After drying at 1, it is sent to the gasification furnace 23. However,
In the type using a fluidized bed as the gasification furnace 23 as described later, the moisture can be easily evaporated from the input waste H. Therefore, when the waste H is previously dried, the gasification efficiency is not so high. No improvement can be expected. Therefore, whether or not the crushed waste H is dried by the dryer 11 is optional.

As the gasification furnace 23, a type using a fluidized bed is used. This is because the bed material such as sand is made to flow by the air from the air dispersion plate in the furnace to form a fluidized bed, and the waste H is poured into the heated fluidized bed so that the bed material is made to flow together with the bed material so that the air is dispersed. It is burned by the air sent from the plate. Then, as an air supply amount into the furnace, for example, the air ratio is set to about 1.0 to 1.3 (normal combustion is about 1.7 to 1.8), and the waste H is partially burned (incomplete combustion). A combustible gasified gas B such as carbon monoxide and a char T are generated. Since the gasification furnace 23 continuously heats the fluidized bed by the heat of the partial combustion of the waste H, a heat source is unnecessary. Further, the gasification furnace 23 is not limited to a type using a fluidized bed, but various combustion furnaces capable of partially burning waste H can be applied.

Then, the gasification furnace 23 discharges the gasification gas B while generating the gasification gas B and the char T. At this time, the char T flows together with the bed material and is further crushed into fine powder. The fine powder T is mixed with the gasified gas B in the flow of the gasified gas B.
Is discharged with. In the gasified gas B, about 90% of the organic chlorine contained in the waste H was contained as hydrogen chloride, and the remaining organic chlorine and inorganic chlorine were not decomposed even after the partial combustion. It remains in the char T. Further, incombustible substances such as aluminum cans mixed into the waste H are directly charged into the gasification furnace 23, stay there while flowing with the fluidized bed, and are discharged from the furnace body together with the discharge of the bed material.

Gasification gas B discharged from gasification furnace 23
Is sent to the separation device 24. The separation device 24 separates the fine powdery char T mixed into the gasification gas B by a dust collector such as a cyclone. The char T separated by the separation device 24 is sent to the storage tank W and stored.
In addition, as the separation device 24, a function of separating and removing an oil component from the gasified gas B can be added. The separated oil component is used as various fuels such as burners.

The gasified gas B that has passed through the separation device 24 is sent to a combustion furnace 25 provided with a burner or the like and burned to generate a combustion gas (hot air) G. Since the combustion gas G is used as a heat source for the dryer 11 and other auxiliary devices, the cost of the system can be reduced. However, the combustion gas G may not be used as a heat source of the dryer 5 or the like, but may be sent to the downstream chlorine removing device 26 via a bypass. The gasification furnace 23 does not require a heat source, but may be used as a heat source for supplying the combustion gas G to the gasification furnace 23 to heat the fluidized bed.

The combustion gas G is sent to a slaked lime charging device 27, a dust collector 28 such as a cyclone, and a chlorine removing device 26 provided with a gas cooling tower (not shown). The chlorine removing device 26 converts the chlorine content into calcium chloride by adding slaked lime to the combustion gas G by the slaked lime charging device 27 and collects the chlorine content in a dust collector 28 downstream to remove the chlorine content from the combustion gas G. However, the chlorine removing device 26 is not limited to this, and various devices capable of removing chlorine from the combustion gas G are applied. The combustion gas G from which chlorine has been removed is treated by a denitration device 29 or the like so as to comply with exhaust gas regulations and the like, and then released into the atmosphere.

FIG. 5 shows a carbide manufacturing apparatus X2a having a partly different form from that of the carbide manufacturing apparatus X2, and those denoted by the same reference numerals as those in FIG. 4 are the same as those shown in FIG.
Description is omitted. 4 is different from FIG. 4 in that the gasification gas B processed by the separation device 24 is sent to the chlorine removal device 30 to remove the organic chlorine contained in the gasification gas B to obtain the dechlorinated gasification gas E. Is a point.

The dechlorinated gasified gas E is burned in the commercial boiler 34 and the exhaust heat recovery boiler 43 provided in the carbide combustion units Y1 and Y2, and used as a heat source. As described above, the cost can be reduced by using the dechlorinated gasified gas E as the heat source of the commercial boiler 34 and the like. Further, since the organic chlorine is removed from the dechlorinated gasified gas E, the influence of corrosion of the boiler tube and malfunction of the burner is small. Further, in the carbide production device X2a, the exhaust gas discharged from the commercial boiler 34 and the like also emits the carbide combustion device Y1,
Y2 can be processed as it is by the existing exhaust gas processing devices 35 and 46.

Further, a part of the dechlorinated gasified gas E is burned in a combustion device or the like, and the combustion gas (hot air) is used as a heat source for the above-mentioned dryer or other auxiliary devices, for example. It is also possible to reduce costs. further,
The gasification furnace 23 does not require a heat source, but may supply the combustion gas to the gasification furnace 23 to be used as a heat source for heating the fluidized bed.

The char T produced by the carbide producing devices X2 and X2a shown in FIGS. 4 and 5 is taken out from the storage tank W by a predetermined amount and sent to the pulverizer 3 shown in FIG.
Dechlorinated char K is formed by the above-described treatment, and is sent to carbide combustion device Y1 and the like in a state where inorganic chlorine is removed. However, whether or not the char T is stored in the storage tank W is optional. For example, the char T can be directly charged into the crusher 3. Also, as described above, if the char T is already in the form of fine powder, it is not necessary to grind it with the grinder 3.

As described above, the carbide producing apparatuses X2 and X2a
, About 90% of the organic chlorine in the waste H is removed, and the inorganic chlorine is removed from the char T by a series of processes shown in FIG. By being introduced into the charcoal combustion device Y1 or the like after most of them have been removed, more waste H can be treated as compared with the conventional case.

FIG. 6 shows a flow chart of carbide combustion in the carbide combustion apparatus Y1, in which the solid arrows indicate the flow of solids and the dotted arrows indicate the flow of gas. The carbide combustion device Y1 shown in FIG. 6 is a so-called thermal power generation device,
A mill 33, a coal-fired business boiler 34, and an exhaust gas treatment device 35 are schematically configured. The commercial boiler 34 includes, for example, a pulverized coal-fired boiler, a stoker-fired boiler, and a fluidized-bed boiler, all of which use coal as a fuel.

The pulverized coal-fired boiler employs a method in which coal C taken out of a coal bunker (not shown) is pulverized into fine powder by a mill 33, and is blown into a furnace from a burner with primary air to perform floating combustion. As a result, the combustion gas has a long residence time, the unburned portion is low, and high combustion efficiency can be realized.

The stoker-fired boiler employs a method in which coal is sprayed on a grate by a sprayer. By sprinkling new coal thinly and widely on the burning coal while drying while floating, it is easy to use. Ignites and burns, and relatively stable combustion is obtained with coal which is difficult to ignite. In the stoker-fired boiler, it is not necessary to pulverize the coal C into fine powder, so that the mill 33 is unnecessary.

The fluidized-bed boiler forms a fluidized bed by flowing sand (bed material) scorched by air supplied from an air distribution plate installed at the lower part of the combustion furnace in the furnace, and puts the fluidized bed into the fluidized bed. It employs a method that instantaneously dries and ignites the fuel that has been burned, efficiently burning the bed material with a long residence time, and burning all types of coal including low-grade coal. It is not necessary to pulverize the coal C into fine powder even in the fluidized-bed boiler, so the mill 33 is unnecessary.

These business boilers 34 rotate a steam turbine (not shown) by the steam generated by the combustion, and a generator (not shown) connected to the steam turbine.
The power generation is carried out. The exhaust gas discharged from the commercial boiler 34 is treated by an exhaust gas treatment device 35 and then released to the atmosphere. Exhaust gas treatment device 3
Reference numeral 5 includes, for example, a gas cooling tower, a dust collector such as a cyclone, a denitration apparatus employing a dry ammonia catalytic reduction method, a desulfurization apparatus employing a high temperature dry or wet limestone gypsum method, and the like. The dust (coal ash) separated by the exhaust gas treatment device 3 is reused in various ways.

FIG. 7 shows a flow chart of the carbide combustion in the carbide combustion apparatus Y2, in which the solid arrows indicate the flow of solids, and the dotted lines (including the dashed-dotted line and the two-dot dashed line) indicate the gas flow. . The carbide combustion device Y2 shown in FIG.
A so-called integrated coal gasification combined cycle facility,
Coal gasifier 37, gas purifier 38, gas turbine 39, generator 40, compressor 41, air separator 4
2, waste heat recovery boiler 43, steam turbine 44, condenser 4
5. The exhaust gas treatment device 46 is schematically configured.

First, coal C, which is a fuel, is pulverized into a fine powder by a mill 36 (however, the installation of the mill 36 is optional), and charged into a gasification furnace (not shown) of a coal gasification facility 37. Is done. Then, the coal C is gasified in the coal gasification facility 37. As the coal C, low-grade coal to anthracite can be gasified in the same furnace.

Incidentally, gasification of coal C is performed by
By supplying approximately half the amount of oxygen required for complete combustion of the coal C to the gasifier, the coal C is partially burned to produce a high-temperature, high-pressure flammable gas mainly composed of carbon monoxide and hydrogen. This is a process for generating F. At this time, by adding water to the coal C to form a fuel slurry, water in the slurry reacts with carbon to cause a water gasification reaction, thereby promoting gasification. The ash generated in the coal gasification facility is discharged as glassy slag.

The high-temperature and high-pressure flammable gas F generated in the coal gasification facility 37 is sent to a gas purification unit 38. The gas purification device 38 includes a desulfurization device such as a desulfurization tower for collecting sulfur, a dust removal device such as a filter, and the like.
The flammable gas F is subjected to a high-temperature dry treatment. In the gas purifier 38, the foreign matter removed from the combustible gas F by the dust remover is discharged as dust.

The combustible gas F purified by the gas purifier 38 is supplied to the gas turbine 39 at high temperature and high pressure. The gas turbine 39 has a rotating shaft 39a connected to the generator 40, and rotates by receiving the pressure of the combustible gas F to drive the generator 40 via the rotating shaft 39a to generate power. At the same time, the compressor 41 disposed on the rotating shaft 39 a of the gas turbine 39 is driven to compress air and send the compressed air to the air separation device 42. The air separation device 42 generates oxygen for partially burning coal in the coal gasification facility 37, and employs a high-pressure cryogenic separation method of separating compressed air into oxygen and nitrogen using a rectification column. The generated oxygen is supplied to the gasifier of the coal gasifier 37.

The combustible gas F after driving the gas turbine 39 is sent to the exhaust heat recovery boiler 43 and burned by a burner or the like and used as a heat source of the exhaust heat recovery boiler 43. The steam generated in the exhaust heat recovery boiler 43 is sent to a steam turbine 44 disposed on a rotating shaft 39a of the gas turbine 39 to rotate the steam. Therefore, when the steam turbine 44 rotates, the generator 40 is driven via the rotating shaft 39a,
Generate electricity.

The steam after driving the steam turbine 44 is:
The heat is exchanged with the cooling water in the condenser 45 to become ascites and returned to the exhaust heat recovery boiler 43. Further, a part of the ascites cooled by the condenser 45 is sent to the coal gasification facility 37, and the coal gasification facility 37 (gasification furnace) is used as a heat source to produce steam.
This steam is sent to the steam turbine 44.

As described above, the carbide combustion device Y2 generates power by the generator 40 by the rotation of the gas turbine 39 by the pressure of the combustible gas F and the rotation of the steam turbine 44 by the steam, and drives the gas turbine 39. The steam obtained by burning the combustible gas F and using the gasifier of the coal gasification facility 37 as a heat source is further used in the steam turbine 4.
4, the heat efficiency is high, and the power can be generated with high efficiency.

The exhaust gas discharged from the exhaust heat recovery boiler 43 is treated by an exhaust gas treatment device 46 and then released to the atmosphere. The exhaust gas treatment device 46 includes, for example, a gas cooling tower, a dust collector, a denitration device, a desulfurization device, and the like, like the exhaust gas treatment device 35 shown in FIG. Also, the dust (coal ash) separated by the exhaust gas treatment device 46 is reused in various ways.

In the carbide combustion devices Y1 and Y2 as shown in FIGS. 6 and 7, the dechlorinated char K produced by the series of processes shown in FIG. Is a commercial boiler 3 like coal C
4 and coal gasification equipment 37 to be burned and processed. At this time, in the dechlorinated char K, most of the organic chlorine was omitted during the production process of the char T, and the inorganic chlorine was also removed as shown in FIG.
, A larger amount can be mixed into the coal C as compared with the conventional method, and the amount of waste H processed per unit time can be dramatically increased.

In the charcoal combustion unit Y2, not only the coal gasification unit 37 but also the gas purification unit 3 which is a downstream unit is used.
8, the gas turbine 39, and the exhaust heat recovery boiler 43 are also affected by corrosion and the like by chlorine. However, when a large amount of dechlorinated char K is mixed with coal C, most of the chlorine content is removed. The adverse effects such as corrosion due to chlorine content of the aluminum alloy do not increase.

Further, the dust extracted from the exhaust gas treatment devices 35 and 46 has little effect on the subsequent treatment since the chlorine content is very small.
Therefore, the existing dust processing facility can be used as it is, and the cost can be reduced, as compared with the case where the cost of treating the ash generated when the waste is incinerated in the incinerator is high. In addition, the carbide manufacturing apparatuses X1a, X2
The dechlorinated pyrolysis gas D and the dechlorinated gasification gas E generated in step (a) are supplied to the commercial boiler 3 of the carbide combustion units Y1 and Y2.
As described above, the fuel is burned in the exhaust heat recovery boiler 4 and used as a part of the heat source.

In FIGS. 6 and 7, the dechlorinated char K
Is mixed with coal C on the upstream side of the mills 33 and 36,
At the same time, the dechlorinated char K is also pulverized. However, when the dechlorinated char K is already in the form of fine powder, it may not be necessary to put the dechlorinated char K into the mills 33 and 36 again. Therefore, when there is no need to pulverize such dechlorinated char K, the coal C is provided downstream of the mills 33 and 36.
May be mixed.

The various shapes and combinations of the constituent members shown in the above embodiment are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention. For example, the present invention is not limited to the thermal power generation equipment shown in FIGS. 6 and 7 as a carbide combustion apparatus, but includes, for example, a dedicated combustion furnace or a melting furnace for burning only the char T of the waste H. It may be.

[0080]

As described above, in the waste treatment method according to the first aspect, the inorganic chlorine (chlorine content) is removed from the carbide of the waste to produce a dechlorinated carbide, which is burned. Therefore, for example, even when dechlorinated carbides are mixed with coal and burned in a commercial boiler or coal gasification facility for a thermal power plant, inorganic chlorine contained in the carbides is injected into a commercial boiler, etc. Instead, much more carbide can be burned in a commercial boiler or the like, thereby increasing the amount of waste processed per unit time and improving the energy use efficiency of garbage. Further, since the chlorine content in the carbide is removed by dissolving it in the predetermined solution, at least a part of the chlorine content contained in the waste is efficiently removed. In addition, since the dechlorinated carbide is in a wet state after the predetermined solution is separated in the solution separation step, it is difficult to ignite even if the dechlorinated carbide is transported and stored in a hopper or the like, and the handleability of the carbide is improved. Can be.

According to the second aspect of the present invention, since the carbide is preliminarily pulverized before the chlorine removing step to reduce the diameter or fineness of the carbide, the surface area of the carbide with respect to a predetermined solution is increased in the chlorine removing step. Thereby, the chlorine content contained in the carbide is easily dissolved in the predetermined solution, and the efficiency of removing the chlorine content can be improved.

According to the third aspect of the present invention, the predetermined solution separated in the solution separation step is used again as the predetermined solution in the chlorine removal step, and the predetermined solution is circulated in the solution separation step and the chlorine removal step. Therefore, the use efficiency of the predetermined solution can be improved, and the processing cost can be reduced, such as a reduction in the amount of the predetermined solution separated in the solution separation step.

According to a fourth aspect of the present invention, there is provided the waste disposal method, wherein the chlorine concentration in the predetermined solution is monitored while the predetermined solution is circulated in the solution separation step and the chlorine removal step, and when the chlorine concentration exceeds the predetermined value. In order to separate the chlorine content from the predetermined solution, it is possible to prevent the circulating predetermined solution from dissolving the chlorine content in the carbide beforehand and to avoid hindering the continuous treatment of waste. be able to. Moreover, it is possible to easily cope with automation of waste disposal.

In the waste treatment system according to the fifth aspect, the inorganic chlorine (chlorine content) is removed from the carbonized waste by the chlorine removing device, and the dechlorinated carbide is generated by the solution separating device. For example, when dechlorinated carbide is mixed with coal and burned in a commercial boiler or coal gasification facility of a thermal power plant, the inorganic chlorine contained in the carbide is not injected into the commercial boiler, etc. Only a large amount of carbide can be burned in a commercial boiler or the like, thereby increasing the amount of waste processed per unit time and improving the energy use efficiency of garbage. Further, since the chlorine content in the carbide is removed by dissolving it in a predetermined solution in the chlorine removing device, at least a part of the chlorine content contained in the waste is efficiently removed. In addition, since the dechlorinated carbide is in a wet state even after the predetermined solution is separated in the solution separation device, it is difficult to ignite even if the dechlorinated carbide is transported and stored in a hopper or the like, and the handling property of the carbide is improved. Can be improved.

In the waste treatment system according to the sixth aspect, since the carbide to be charged into the predetermined solution of the chlorine removing device is pulverized in advance by a pulverizer to reduce the diameter or fineness of the carbonized material, the chlorine removing device is provided with a predetermined solution. By increasing the surface area of the carbide, the chlorine content contained in the carbide can be easily dissolved in the predetermined solution, and the efficiency of removing the chlorine content can be improved.

The waste treatment system according to claim 7 uses the predetermined solution separated by the solution separation device via the circulation path again as the predetermined solution of the chlorine removal device, and uses the predetermined solution with the solution separation device and the chlorine removal device. Therefore, the use efficiency of the predetermined solution can be improved, and the processing cost such as reduction of the processing amount of the predetermined solution separated by the solution separation device can be reduced.

In the waste treatment system according to the eighth aspect, the chlorine concentration in the predetermined solution is monitored by a sensor while the predetermined solution is circulated through the solution separating device and the chlorine removing device, and the chlorine concentration is adjusted to the predetermined value. When it exceeds, to separate the chlorine content from the predetermined solution in the separation processing device, to prevent the circulating predetermined solution from dissolving the chlorine content in the carbide beforehand,
It is possible to avoid hindering continuous treatment of waste. Moreover, it is possible to easily cope with automation of waste disposal.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing an example of a carbide production device.

FIG. 3 is a flowchart showing another example of the carbide manufacturing device.

FIG. 4 is a flowchart showing another example of the carbide producing apparatus.

FIG. 5 is a flowchart showing another example of the carbide manufacturing apparatus.

FIG. 6 is a flowchart showing an example of a carbide combustion device.

FIG. 7 is a flowchart showing another example of the carbide combustion device.

[Explanation of symbols]

 H waste K dechlorinated char (dechlorinated carbide) M mixture T char (carbide) X1, X1a, X2, X2a carbide production device Y1, Y2 carbide combustion device 1 chlorine removal device 2 solution separation device 3 crusher 6 Circulation path 7 Sensor 8 Separation processing device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norio Ayabe 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima-Harima Heavy Industries, Ltd. F-term (reference) 3K061 AA24 AB02 AC01 AC13 BA02 BA05 FA07

Claims (8)

[Claims] 1. A method of treating a waste by carbonizing the waste and burning the carbide, wherein the carbide is put into a predetermined solution and a chlorine content of the carbide is dissolved in the predetermined solution. A waste disposal method comprising: a chlorine removing step; and a solution separating step of separating a predetermined solution from a mixture of the carbide and the predetermined solution to generate a dechlorinated carbide. 2. The waste disposal method according to claim 1, wherein the carbide is pulverized in advance before the chlorine removing step. 3. The waste treatment method according to claim 1, wherein the predetermined solution separated in the solution separation step is used as a predetermined solution in the chlorine removal step. 4. The method according to claim 3, wherein a concentration of chlorine dissolved in the predetermined solution is detected, and when the detection result exceeds a predetermined value, a process of separating chlorine from the predetermined solution is performed. Waste treatment method. 5. A system for treating waste by carbonizing waste and burning the carbide, comprising a predetermined solution into which the carbide is charged, and converting a chlorine content of the carbide into the predetermined solution. A chlorine removing device for dissolving, and a solution separating device for separating the predetermined solution from a mixture of the carbide and the predetermined solution discharged from the chlorine removing device to generate a dechlorinated carbide. Waste treatment system. 6. A crusher for crushing said carbides charged in said predetermined solution in advance.
Waste treatment system as described. 7. The waste treatment system according to claim 5, further comprising a circulation path for sending the predetermined solution separated by the solution separation device to the chlorine removal device. 8. A sensor for detecting the concentration of chlorine dissolved in the predetermined solution, and a separation processing device for separating chlorine from the predetermined solution when a detection result from the sensor exceeds a predetermined value. The waste treatment system according to claim 7, further comprising: