JP4770435B2 - Method and apparatus for cooling waste pyrolysis char - Google Patents

Description

  The present invention relates to a method for cooling a waste pyrolysis char for cooling a char taken out from a pyrolysis gasifier which is capable of pyrolyzing waste such as municipal waste and separating it into pyrolysis gas and char. And the apparatus.

  As a waste disposal system such as municipal waste, as an alternative to the combustion method in which waste is burned in an incinerator, in recent years, waste is thermally decomposed by heating in a low oxygen atmosphere, A combustible pyrolysis gas and char (carbide) as pyrolysis residue are generated, and then the pyrolysis gas and char are both introduced into a melting furnace and combusted at a high temperature. The pyrolysis gasification and melting method that allows the contained ash to be extracted as molten slag, and the pyrolysis gas and char are generated by the same pyrolysis treatment of waste as above, and then the char is recovered. As a heat source for thermal decomposition, the pyrolysis gas is burned and pyrolyzed while being used as fuel in coal-fired boilers at various external facilities. Treatment facility waste by carbonization processing method which is adapted to use have been developed and come into practical use.

  As an apparatus used for thermally decomposing waste into pyrolysis gas and char as described above, there is an external heat kiln type waste pyrolysis gasification apparatus as schematically shown in FIG.

  That is, the external heat kiln-type waste pyrolysis gasifier 1 shown in FIG. 2 integrally connects the supply pipe 4a to the inlet 4 side at one end and the discharge pipe 5a to the outlet 5 side at the other end. A heating flow path 7 is formed between the connected inner cylinder 3 and the outer cylinder 6 arranged concentrically outside the inner cylinder 3 so that the outer cylinder 6 and the inner cylinder 3 can be rotated together. The pyrolysis kiln furnace 2 is disposed so as to be inclined so that the outlet 5 side at the other end is slightly lower than the inlet 4 side at one end, and is rotated at a low speed by a driving device (not shown).

  In addition, a dust feeder 8 is provided at the inlet 4 of the pyrolysis kiln furnace 2 so as to be inserted into the supply pipe 4 a, and the waste 10 thrown into the charging hopper 9 is fed to the inlet 4 by the dust feeder 8. It is made to supply. On the other hand, at the outlet 5 of the pyrolysis kiln furnace 2, the pyrolysis gas 12 and the char 13 generated as the pyrolysis residue are separated, and the pyrolysis gas 12 is separated from the pyrolysis gas outlet 11 a at the top, Separation chambers 11 for taking out the char 13 from the char take-out port 11b are provided.

  Further, a heating gas inlet 14 is provided on the outlet 5 side of the pyrolysis kiln furnace 2, and a high-temperature heating gas 15 generated in a hot air generating furnace (not shown) is supplied to the heating gas inlet 14, so The waste 10 in the inner cylinder 3 is circulated through the path 7 and discharged from the heated gas outlet 16 provided on the inlet 4 side by the external heat generated by the high-temperature heated gas 15 flowing in the heated flow path 7. The pyrolysis gas 12 and the char 13 are generated by indirect heating and pyrolysis (see, for example, Patent Document 1).

  Thereafter, for example, in a waste treatment facility that performs pyrolysis gasification melting treatment, as shown in FIG. 3, pyrolysis gas 12 generated by pyrolysis of waste 10 in the waste pyrolysis gasification apparatus 1 as described above. Of the char 13, the pyrolysis gas 12 is sent to the melting furnace 18 through the pyrolysis gas line 17 connected to the pyrolysis gas outlet 11 a of the separation chamber 11.

  On the other hand, the char 13 separated from the pyrolysis gas 12 in the separation chamber 11 is taken out from the char outlet 11b of the separation chamber 11, and at this time, combustible pyrolysis gas 12 is generated. It is necessary to prevent the atmosphere (air) from flowing back into the pyrolysis kiln 2 in a closed state. For this purpose, a double flap damper 19 is attached to the char outlet 11b of the separation chamber 11 as a take-out device, and hopper casings 21a and 21b each incorporating flap dampers 20a and 20b are stacked in two upper and lower stages. By opening and closing the upper and lower flap dampers 20a and 20b alternately so that the cycles of the opening and closing operations do not overlap each other, at least one flap damper 20a or 20b is in a closed state, The char 13 is semi-continuously extracted from the separation chamber 11 while preventing the backflow of air.

  Further, the char 13 taken out from the separation chamber 11 has a high temperature of about 450 ° C. and contains ash, fixed carbon, and volatile components in a ratio of about 1: 1: 1. For this reason, since the char 13 may ignite when it is in contact with the atmosphere with high temperature, cooling is required when the char 13 is taken out. Therefore, conventionally, a screw 26 is provided in a cylindrical casing 23 in which a receiving hopper 24 is provided at the upper end on one end side in the longitudinal direction that is the inlet side of the cooling device and a discharge port 25 is provided at the lower end on the other end side that is the outlet side. And a screw conveyor type indirect cooling device (char extraction device) 22 provided with a water cooling jacket 27 on the outer periphery of the casing 23, and the receiving hopper of the indirect cooling device 22. 24 is connected to the lower end of the double flap damper 19. Accordingly, the char 13 dropped from the double flap damper 19 to the receiving hopper 24 is circulated through the water cooling jacket 27 while being conveyed to the discharge port 25 through the casing 23 by the rotational drive of the screw 26. The heat is exchanged with water and indirectly cooled to cool to about 70 to 80 ° C. and then taken out to the outside.

  After being cooled through the indirect cooling device 22, the extracted char 13 is then reduced in size by the incombustible material separating device 29 after a large incombustible material such as metal is separated and removed by the separating device 28. The incombustible material is removed and then sent to the melting furnace 18 so that it is burned together with the pyrolysis gas 12 at a high temperature with a low air ratio to form a molten slag 30 (for example, a patent). Reference 2).

  The indirect cooling device 22 normally stores a predetermined amount of char 13 in the receiving hopper 24 by controlling the rotational drive of the screw 26 according to the storage level of the char 13 in the receiving hopper 24. The material seal can be formed. Further, the double flap damper 19 and the indirect cooling device 22 are normally purged with nitrogen so as to keep the inside at a positive pressure and prevent intrusion of the atmosphere.

  By the way, in the screw conveyor type conveying device having a cooling function, in addition to providing a water cooling jacket for circulating cooling water in a casing for storing the screw, a cooling water flow path extending in the longitudinal direction also in the central portion of the screw shaft It has been conventionally proposed to improve the cooling efficiency so that the object to be conveyed can also be indirectly cooled by exchanging heat with the cooling water that circulates inside the screw shaft. (See Patent Document 3).

JP 2003-277760 A JP 2002-168420 A JP-A-8-166116

  However, the char 13 produced by the thermal decomposition of the waste 10 in the waste pyrolysis gasifier 1 as shown in FIG. 2 is not only powdery but also flaky, so the density is small and the heat conductivity is low. . Therefore, the indirect cooling method in the indirect cooling device 22 of the screw conveyor type as shown in FIG. 3 cannot increase the cooling efficiency so much. Only by such indirect cooling, unless the cooling device has a considerable residence time and a large stirring ability, the temperature cannot be lowered sufficiently, and there is a possibility that the cooling may be uneven. Furthermore, if the char 13 is in contact with the atmosphere in a state where the temperature has not been sufficiently lowered, the fire is ignited in a state where the ignited fire remains, and in order to eliminate this, the indirect cooling device 22 There has been a need for a large apparatus with a long residence time.

  In addition, because the double flap damper 19 and the indirect cooling device 22 are sequentially provided below the separation chamber 11 of the waste pyrolysis gasifier 1, the indirect cooling device 22 is installed underground. In many cases, however, providing a large space for installing the large indirect cooling device 22 in the underground portion is a factor that increases the construction cost of the waste treatment facility.

  On the other hand, a method of directly cooling the char 13 taken out from the waste pyrolysis gasifier 1 by directly spraying cooling water is considered to be effective for obtaining high cooling efficiency. In the case of direct spraying of water, the recovered char 13 is moistened, and when the recovered char 13 is in a moist state, the amount of heat generated when the char 13 is burned is reduced, or to the equipment. In reality, the direct cooling of the char 13 by the direct spraying of water has not been adopted in the past.

  Therefore, the present invention can efficiently and reliably cool the char taken out from the waste pyrolysis gasifier by using both direct cooling and indirect cooling, and can recover the char without moistening it. It is an object of the present invention to provide a method and an apparatus for cooling a waste pyrolysis char.

  In order to solve the above-mentioned problems, the present invention provides a method in which the temperature of the char is 100 ° C. or higher with respect to the char that is separated from the pyrolysis gas after pyrolyzing the waste in the waste pyrolysis gasifier. A method for cooling a waste pyrolysis char, which is directly cooled by spraying cooling water whose amount is adjusted so as to be maintained in a range, and then indirectly cooling the char to a required temperature of 100 ° C. or lower; and Directly cool the char taken out from the char outlet by spraying cooling water directly on the downstream side of the char outlet for taking out the char generated by the pyrolysis of waste from the waste pyrolysis gasifier A cooling zone and an indirect cooling device for indirect cooling of the char are provided in this order, and the temperature of the char that passes through the direct cooling zone and is received by the indirect cooling device is detected. Temperature and the cooling device waste pyrolysis char having a configuration with a device for adjusting the direct amount of cooling water sprayed in the cooling zone so as to be kept at a temperature in the range of more than 100 ° C..

  In addition, after pyrolyzing the waste in the waste pyrolysis gasifier, the char that is separated from the pyrolysis gas and taken out is directly cooled by spraying cooling water, and the char that has been directly cooled is removed. The amount of cooling water to be sprayed is adjusted so that the detected temperature of the char falls within a temperature range of 100 ° C. or higher, and the char after the direct cooling is indirectly cooled. And a double flap damper is attached to the char take-out port of the waste pyrolysis gasifier, and the indirect cooling device is installed under the double flap damper. A receiving hopper is connected, and a cooling water spray nozzle is provided at the lower position of the lower hopper casing of the double flap damper or at the upper position of the receiving hopper of the indirect cooling device. A direct cooling zone is formed so that cooling water can be sprayed on the char that falls from the heavy flap damper toward the bottom of the receiving hopper, and the receiving hopper of the indirect cooling device receives the receiving The apparatus has a configuration in which a temperature controller having a function of detecting a temperature of the char received into the hopper and controlling a flow rate control valve on the cooling water supply pipe connected to the spray nozzle is provided.

  Further, in the above configuration, the lower hopper casing of the double flap damper is connected to a required part of the waste pyrolysis gasifier by a steam discharge pipe with an on-off valve, and the temperature controller is connected to the cooling water supply pipe. In response to the opening / closing control of the flow control valve, a function of controlling the opening / closing valve on the steam discharge pipe is also provided.

According to the present invention, the following excellent effects are exhibited.
(1) The amount of char is adjusted so that the char can be kept in a temperature range of 100 ° C or higher after pyrolyzing the waste with the waste pyrolysis gasifier and separated from the pyrolysis gas. The cooling water is sprayed and directly cooled, and then the char is indirectly cooled to cool to a required temperature of 100 ° C. or less, and the waste pyrolysis gasification apparatus and the waste A direct cooling zone in which cooling water is sprayed directly on the char taken out from the char take-out port and directly cooled on the downstream side of the char take-out port for taking out the char generated by thermal decomposition of the char, and for indirect cooling of the char An indirect cooling device is provided in order, and further, the temperature of the char that passes through the direct cooling zone and is received by the indirect cooling device is detected, and the detected temperature of the char is maintained in a temperature range of 100 ° C. or more. Since it is a cooling device for a waste pyrolysis char having a configuration with a device for adjusting the amount of cooling water sprayed in the direct cooling zone, 450 ° C. extracted from the waste pyrolysis gasification device Since the char having a high temperature can be efficiently cooled by direct cooling with the sprayed cooling water, the temperature range to be cooled by the subsequent indirect cooling can be reduced. Therefore, the char can be efficiently and reliably cooled by a combination of direct cooling and indirect cooling. Moreover, since the amount of cooling water sprayed for direct cooling is adjusted so that the char can be maintained in a temperature range of 100 ° C. or higher, all cooling water sprayed for direct cooling of the char is all It is possible to evaporate, so that the possibility of char getting wet can be eliminated. Therefore, it is possible to eliminate the possibility that the calorific value is reduced when the taken-out char is burned, or that problems such as adhesion to equipment and handling occur.
(2) Furthermore, as the indirect cooling device for performing the indirect cooling, the temperature range to be cooled by indirect cooling can be reduced as described above, and therefore the cooling capacity required for the indirect cooling device is 450 ° C. The degree of char can be reduced as compared with the cooling capacity required for cooling to the required temperature only by indirect cooling. Therefore, it is possible to eliminate the necessity for the indirect cooling device to be a large device with a long residence time, and in the case where the indirect cooling device is provided in the underground space, it is possible to eliminate the need to provide a large space in the underground part. It becomes possible to reduce the construction cost of the facility.
(3) After pyrolyzing the waste in the waste pyrolysis gasifier, the char that is separated and separated from the pyrolysis gas is directly cooled by spraying cooling water, and then directly cooled. The temperature of the char is detected, the amount of the cooling water to be sprayed is adjusted so that the detected temperature of the char falls within a temperature range of 100 ° C. or more, and the char after the direct cooling is indirectly A method of cooling to a required temperature of 100 ° C. or less, and a double flap damper is attached to the char outlet of the waste pyrolysis gasifier, and an indirect cooling device is provided below the double flap damper. A cooling water spray nozzle is provided at the lower position of the lower hopper casing of the double flap damper or at the upper position of the receiving hopper of the indirect cooling device. A direct cooling zone is formed so that cooling water can be sprayed on the char falling from the double flap damper toward the bottom of the receiving hopper, and the receiving hopper of the indirect cooling device has A device having a configuration in which a temperature controller having a function of detecting a temperature of the char received into the receiving hopper and controlling a flow rate control valve on the cooling water supply pipe connected to the spray nozzle is provided. Therefore, the device configuration for spraying cooling water directly on the char to directly cool the temperature controller that can be used as a general sequence control device, spray nozzle for quantitatively spraying the cooling water, flow rate Since it can be realized with simple equipment that only has a cooling water supply pipe with a control valve, the cost can be reduced and the waste pyrolysis gasifier Attaching a double flap damper char outlet, can be easily installed in a conventional waste treatment facility of the type formed by connecting the receiving hopper of the indirect cooling device below the said double flap damper.
(4) The lower hopper casing of the double flap damper and the required part of the waste pyrolysis gasifier are connected by a steam discharge pipe with an open / close valve, and the flow rate control on the cooling water supply pipe is connected to the temperature controller. Steam generated by evaporating the cooling water sprayed for direct cooling of the char by providing a function to control the on-off valve on the steam discharge pipe corresponding to the on-off control of the valve. However, the possibility of excessive filling of the lower hopper casing of the double flap damper and the receiving hopper of the indirect cooling device can be eliminated, and excess steam discharged through the steam discharge pipe is sent to the waste pyrolysis gasifier. And can be used as an inert gas.

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

  FIG. 1 shows a method and apparatus for cooling a waste pyrolysis char according to the present invention. In the waste pyrolysis gasification apparatus 1 similar to that shown in FIG. Similarly to the configuration shown in FIG. 3, the double flap damper 19 and the screw conveyor type indirect cooling device 22 including the water cooling jacket 27 are provided in this order, and the lower flap damper in the double flap damper 19 is provided. A spray nozzle 32 for cooling water 31 is provided at a lower position of the hopper casing 21b of 20b or an upper position of the receiving hopper 24 of the indirect cooling device 22 (in the figure, the spray nozzle 32 is provided at an upper position of the receiving hopper 24). Is shown). The spray nozzle 32 is connected to a cooling water supply unit (not shown) via a cooling water supply pipe 33 with a flow rate control valve 34, so that the spray nozzle 32 is located near the installation location of the spray nozzle 32 from the hopper casing 21 b of the lower flap damper 20 b. A direct cooling zone A for directly cooling the char 13 falling toward the bottom of the receiving hopper 24 by spraying the cooling water 31 is formed. Further, the receiving hopper 24 of the indirect cooling device 22 detects the temperature of the char 13 received in the hopper 24, and the flow rate control valve 34 on the cooling water supply pipe 33 according to the detected temperature of the char 13. A temperature controller 35 is provided for feedback control. As a result, the upper and lower flap dampers 20a and 20b of the double flap damper 19 are alternately opened and closed in the same manner as in the prior art, thereby being semi-continuously extracted from the separation chamber 11 of the waste pyrolysis gasifier 1. When the char 13 falls through the direct cooling zone A toward the bottom of the receiving hopper 24 of the indirect cooling device 22, a required amount of cooling water 31 is sprayed from the spray nozzle 32 to directly cool the char 13. Furthermore, when spraying the cooling water 31 onto the char 13, the temperature of the char 13 in the receiving hopper 24 of the indirect cooling device 22 detected by the temperature controller 35 is a required temperature of 100 ° C. or more. For example, the flow rate control valve 34 on the cooling water supply pipe 33 is controlled by the temperature controller 35 so that the temperature is about 110 ° C. So as to adjust the amount of spray water 31. The char 13 that has been cooled to about 110 ° C. in the receiving hopper 24 by direct cooling by spraying the cooling water 31 is then moved to the casing by the indirect cooling device 22 by the rotational drive of the screw 26 as in the prior art. While being conveyed to the discharge port 25 side through the inside 23, it is indirectly cooled by the cooling water 31 circulated through the water cooling jacket 27 and cooled to 70 to 80 ° C. and then taken out from the discharge port 25 to the outside.

  Details will be described below.

  The indirect cooling device 22 includes limit switches 36b and 36a at the lower position and the upper position of the receiving hopper 24, respectively, and if the level of the char 13 stored in the hopper 24 cannot be detected by the lower limit switch 36b, By stopping the rotational drive device 38 of the screw 26 via the operation controller 37, the char 13 is always stored in the receiving hopper 24 at least up to the level of the lower limit switch 36b as shown by a two-dot chain line in FIG. The material seal can be formed. On the other hand, when the level of the char 13 stored in the receiving hopper 24 is detected by the upper limit switch 36a, the rotational speed of the screw 26 by the rotary drive device 38 is increased through the operation controller 37. The speed at which the char 13 is conveyed by the screw 26 can be increased.

  The temperature controller 35 is attached at a position slightly lower than the lower limit switch 36b in the receiving hopper 24 so that the temperature of the char 13 in the receiving hopper 24 of the indirect cooling device 22 can be reliably detected. It is like that.

  Further, one end portion of a steam discharge pipe 39 with an on-off valve 40 controlled by the temperature controller 35 is provided at the upper position of the lower hopper casing 21b incorporating the lower flap damper 20b in the double flap damper 19. In addition to the connection, the other end of the steam discharge pipe 39 is connected to a required portion in the waste pyrolysis gasifier 1, for example, the separation chamber 11.

  Here, the control by the temperature controller 35 will be specifically described.

  The temperature controller 35 opens the flow control valve 34 in synchronization with the opening operation of the lower flap damper 20b in the double flap damper 19 or slightly delayed from the opening operation of the lower flap damper 20b. As a result, the double flap damper 19 is extracted from the separation chamber 11 of the waste pyrolysis gasifier 1, and the receiving hopper 24 of the indirect cooling device 22 is passed through the lower hopper casing 21b by the opening operation of the lower flap damper 20b. When the char 13 having a high temperature of about 450 ° C. that is dropped into the direct passage passes through the direct cooling zone A, the cooling water 31 is sprayed from the spray nozzle 32, and the char 13 by the sprayed cooling water 31 is sprayed. Can be directly cooled. Further, at this time, the temperature controller 35 detects the temperature of the char 13 that is dropped and stored in the receiving hopper 24 and controls the flow rate so that the detected temperature of the char 13 becomes about 110 ° C. The amount of the cooling water 31 sprayed from the spray nozzle 32 onto the char 13 is adjusted by adjusting the opening of the valve 34.

  In the above, since the char 13 retains about 110 ° C. and a temperature equal to or higher than the evaporation temperature of water even after being directly cooled by spraying the cooling water 31, the cooling water sprayed on the char 13 is used. All 31 is evaporated to generate positive pressure steam 41. Since the steam 41 fills the receiving hopper 24 of the indirect cooling device 22 and the lower hopper casing 21b of the double flap damper 19, the temperature controller 35 opens the flow control valve 34. The opening / closing valve 40 on the steam discharge pipe 39 is operated to open in synchronization or a little later so that the excess of the steam 41 generated by the evaporation of the cooling water 31 used for cooling the char 13 is reduced to the lower hopper. The steam is discharged from the casing 21b through the steam discharge pipe 39 and can be sent to the separation chamber 11 of the waste pyrolysis gasifier 1 maintained at a slight negative pressure.

  Thereafter, when the lower flap damper 20b of the double flap damper 19 is closed, the temperature controller 35 closes the flow control valve 34 to stop spraying the cooling water 31 from the spray nozzle 32. At the same time, the on-off valve 40 is closed to block the flow of the steam 41 in the steam discharge pipe 39.

Thereafter, the temperature controller 35 repeats the opening / closing operation of the flow control valve 34 and the opening / closing valve 40 described above corresponding to the opening / closing operation of the lower flap damper 20b of the double flap damper 19. When performing such control, if the temperature of the char 13 in the receiving hopper 24 of the indirect cooling device 22 detected by the temperature controller 35 has dropped too low to be below 110 ° C., The operation of opening the flow control valve 34 corresponding to the opening operation of the lower flap damper 20b is temporarily interrupted, and the spraying of the cooling water 31 from the spray nozzle 32 to the char 13 is temporarily stopped, whereby the indirect cooling device 22 is received. The temperature of the char 13 in the hopper 24 is raised to keep it at about 110 ° C., which is a temperature equal to or higher than the evaporation temperature of water.
Thus, when the opening operation of the flow control valve 34 is temporarily interrupted and the spraying of the cooling water 31 from the spray nozzle 32 is temporarily stopped, there is no generation of the steam 41 due to the direct cooling of the char 13 by the cooling water 31. Therefore, the opening operation of the on-off valve 40 on the steam discharge pipe 39 is also canceled.

  In order to improve the cooling efficiency, the indirect cooling device 22 according to the present invention is provided with a flow path (not shown) of the cooling water 31 at the axial center of the screw shaft 26a of the screw 26, and the inside of the screw shaft 26a. The char 13 is indirectly cooled by the cooling water 31 that circulates. Reference numeral 42 in FIG. 1 is a temperature detector provided in the vicinity of the discharge port 25 of the indirect cooling device 22 for constantly monitoring the temperature of the char 13 discharged from the indirect cooling device 22. When the temperature of the char 13 detected by the vessel 42 is higher than the desired 70 to 80 ° C., the char 13 is directly cooled by spraying the cooling water 31 or indirectly cooled by the indirect cooling device 22. May not be performed properly, an alarm may be issued or the entire system for performing the thermal decomposition process of the waste 10 may be stopped. Reference numeral 43 denotes a conveyor for transporting the cooled char 13 taken out from the discharge port 25 of the indirect cooling device 22 to a required portion on the downstream side, for example, a melting furnace (not shown). Although not shown in the drawings, there are appropriate places in the conveyor 43 downstream of the indirect cooling device 22, the upper hopper casing 21 a of the double flap damper 19, the casing 23 of the indirect cooling device 22, etc. Nitrogen purging is performed in the same manner as in the prior art, so that the inside can be maintained at a positive pressure to prevent air from entering. Other components that are the same as those shown in FIGS. 2 and 3 are given the same reference numerals.

  According to the cooling method and cooling apparatus for waste pyrolysis char of the present invention having the above-described configuration, the char 13 extracted from the waste pyrolysis gasification apparatus 1 is firstly cooled with water 31 sprayed from the spray nozzle 32. After the direct cooling to about 110 ° C. by the indirect cooling device 22, the char 13 at about 110 ° C. is cooled to 70 to 80 ° C. Therefore, the char 13 is directly and indirectly cooled. Cooling can be efficiently and reliably performed by the combined use with cooling.

  Further, the amount of the cooling water 31 to be sprayed is adjusted so that the char 13 after direct cooling by spraying the cooling water 31 becomes about 110 ° C. which is a temperature equal to or higher than the evaporation temperature of water. Therefore, all of the cooling water 31 sprayed for direct cooling of the char 13 can be evaporated, and the possibility of the char 13 becoming wet can be eliminated. Accordingly, it is possible to eliminate the possibility that the calorific value is reduced when the char 13 after being taken out is combusted, or that problems such as attachment to the equipment and handling occur.

  As a device configuration for directly cooling the char 13 by spraying the cooling water 31, a temperature controller 35 that can be a general sequence control device and a spray for quantitatively spraying the cooling water 31. Since it is simply equipped with the nozzle 32 and the cooling water supply pipe 33 with the flow rate control valve 34, the cost can be reduced and the conventional waste treatment facility as shown in FIG. Can also be installed easily.

  In the indirect cooling device 22, the cooling water 31 sprayed from the spray nozzle 32 is directly cooled from the high temperature state of about 450 ° C. extracted from the waste pyrolysis gasification device 1 to about 110 ° C. Since the char 13 has only to be cooled to 70 to 80 ° C., the cooling capacity required for the indirect cooling device 22 can be made to cool the char 13 at about 450 ° C., which has been conventionally required, to 70 to 80 ° C. Therefore, the cooling capacity can be reduced. Therefore, it is possible to eliminate the need for the indirect cooling device 22 to be a large device having a long residence time, and to eliminate the need to provide a large space in the underground portion in order to install the indirect cooling device 22. It becomes possible to reduce the construction cost of the treatment facility.

  Moreover, in the lower hopper casing 21 b of the double flap damper 19, the inside is made positive by the steam 41, which is an inert gas generated by the evaporation of the cooling water 31 used for direct cooling of the char 13. Therefore, the effect of improving the sealing performance of the waste pyrolysis gasifier 1 can be expected, and the function of blocking the outside air and preventing the pyrolysis gas 12 from leaking can also be expected.

  Note that the present invention is not limited to the above-described embodiment. If the cooling water 31 can be sprayed directly onto the char 13 that is dropped by the opening operation of the lower flap damper 2b, the spray nozzle 32 can be double. Arrangement and number of the flap damper 19 are arbitrarily changed, for example, by arranging a plurality in the circumferential direction or in multiple stages in the vertical direction on the lower part of the lower hopper casing 21b or the upper part of the receiving hopper 24 of the indirect cooling device 22. May be.

The temperature controller 35 detects the temperature of the char 13 in the receiving hopper 24 of the indirect cooling device 22 and controls the spray amount of the cooling water 31 through the control of the flow rate control valve 34 on the cooling water supply pipe 33. A temperature detector that is installed in the receiving hopper 24 and detects the temperature of the char 13, and a controller that controls the flow rate control valve 34 based on a signal input from the temperature detector; May be separated. Further, the control function of the temperature controller 35 is controlled based on the input from the operation controller (not shown) of the waste pyrolysis gasifier 1 and the upper and lower limit switches 36a and 36b of the indirect cooling device 22. You may make it integrate with the function of another controllers, such as the operation controller 37 which controls the rotational drive apparatus 38. FIG.
Of course, various changes can be made without departing from the scope of the present invention.

It is a schematic diagram showing one embodiment of a cooling method and apparatus for waste pyrolysis char of the present invention. It is a schematic diagram which shows an example of the waste pyrolysis gasification apparatus proposed conventionally. It is a schematic diagram which shows an example of the waste treatment facility of the format which performs the pyrolysis gasification melting process of the waste proposed conventionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste pyrolysis gasifier 10 Waste 11b Char outlet 12 Pyrolysis gas 13 Char 19 Double flap damper 21a, 21b Hopper casing 22 Indirect cooling device 24 Receiving hopper 31 Cooling water 32 Spray nozzle 33 Cooling water supply pipe 34 Flow control valve 35 Temperature controller 39 Steam exhaust pipe 40 On-off valve A Direct cooling zone

Claims (6)

  Cooling water whose amount is adjusted so that the char can be kept in a temperature range of 100 ° C. or higher with respect to the char which is separated from the pyrolysis gas after the pyrolysis of the waste by the waste pyrolysis gasifier. A method for cooling a waste pyrolysis char, wherein the char is indirectly cooled by spraying, and then the char is indirectly cooled to a required temperature of 100 ° C. or lower.   After pyrolyzing the waste in the waste pyrolysis gasifier, the temperature of the char after being directly cooled while directly cooling the char that is separated from the pyrolysis gas by spraying cooling water The amount of cooling water to be sprayed is adjusted so that the detected temperature of the char is in the temperature range of 100 ° C. or higher, and the char after the direct cooling is indirectly cooled. A method for cooling a waste pyrolysis char, characterized by cooling to a required temperature of 100 ° C. or lower.   Direct cooling in which cooling water is sprayed directly on the char taken out from the char take-out port on the downstream side of the char take-out port for taking out the char generated by the pyrolysis of waste from the waste pyrolysis gasifier. A zone and an indirect cooling device for indirectly cooling the char are provided in order, and further, the temperature of the char received through the direct cooling zone and received by the indirect cooling device is detected, and the detected temperature of the char is 100 ° C. A waste pyrolysis char cooling device comprising a device for adjusting an amount of cooling water sprayed in the direct cooling zone so as to be maintained in the above temperature range.   A double flap damper is attached to the char outlet of the waste pyrolysis gasifier, and a receiving hopper of the indirect cooling device is connected to the lower side of the double flap damper. The cooling water spray nozzle is provided at the lower position of the indirect cooling device or the upper position of the receiving hopper of the indirect cooling device, and the char that falls from the double flap damper toward the bottom of the receiving hopper is provided near the spray nozzle. 4. The cooling apparatus for a waste pyrolysis char according to claim 3, wherein a direct cooling zone is formed so that cooling water can be sprayed.   The receiving hopper of the indirect cooling device is provided with a temperature controller that detects the temperature of the char received in the receiving hopper and controls the flow rate control valve on the cooling water supply pipe connected to the spray nozzle. The apparatus for cooling a waste pyrolysis char according to claim 4.   Connect the lower hopper casing of the double flap damper to the required part of the waste pyrolysis gasifier with a steam discharge pipe with an open / close valve, and open / close the flow control valve on the cooling water supply pipe to the temperature controller 6. The waste pyrolysis char cooling device according to claim 5, wherein a function of controlling the on-off valve on the steam discharge pipe is provided corresponding to the control.

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