JP4458971B2 - Waste pyrolysis treatment system - Google Patents

Description

  The present invention relates to a waste pyrolysis processing system for processing a workpiece such as waste by pyrolysis.

  Conventionally, there is a waste pyrolysis treatment system that treats waste by thermal decomposition as a waste treatment system that converts unsorted and untreated waste containing various pollutants into usable materials. As such a waste pyrolysis processing system, a system described in JP 2000-202419 A (Patent Document 1) is known.

  In such a waste pyrolysis processing system, a material to be treated such as waste is supplied into a pyrolysis furnace by a waste supply device via a pretreatment device, and is heated at a temperature of about 550 ° C. in the pyrolysis furnace. Processed by decomposition. As a general pyrolysis furnace, for example, an externally heated rotary kiln that heats a rotary drum from the outside is used.

  The organic polymer gas generated by pyrolysis in the pyrolysis furnace is reformed at a temperature of about 1100 ° C. by a gas reformer to become a low molecular combustible gas, and then from about 900 ° C. to 200 ° C. by a gas cooler. It is rapidly cooled to about 0 ° C. and further purified by a gas purification device. In the gas cleaning process performed by the gas purification device, removal of carbon dust by a bag filter and gas water cleaning by water are performed. The combustible gas purified by the gas purification device is supplied to the gas usage destination through the induction blower, the water seal device, and the supply blower. These pyrolysis furnaces, gas reformers, gas coolers, and gas purification devices are controlled by the induction blower to a slightly negative pressure state, so that air easily enters from the outside. The main part is provided with a sealing structure so that the excessive amount does not enter.

However, in such a waste pyrolysis processing system, since the reformed gas is washed with water, the process gas is saturated with moisture. Combustible process gas is supplied to gas engines, etc., but because it contains a large amount of moisture, drain water accumulates in the middle of the piping, obstructing gas flow, and drain water accumulates in the induction blower and supply blower. There is a problem that obstructs the rotation function.
JP 2000-202419 A

  The present invention has been made in view of such a conventional technical problem, and continuously recovers drain water accumulated in pipes and blowers, and is capable of stable and long-term waste disposal. An object is to provide a processing system.

  According to the first aspect of the present invention, in the waste pyrolysis processing system for processing a workpiece such as waste by pyrolysis, the supply pipe for supplying the process gas is horizontal or slightly negative with respect to the gas flow direction. Connect the upper end of the drain pipe to the place where the supply pipe turns to a positive gradient, and have a margin in the maximum boosting capacity of the supply blower for supplying the process gas to the drain pot at the lower end of the drain pipe It is characterized by being submerged by the length of the length.

  According to a second aspect of the present invention, in the waste thermal decomposition treatment system according to the first aspect, the drain pot is provided with a drain water overflow pipe and a plugged cleaning port.

  According to a third aspect of the present invention, in the waste thermal decomposition treatment system according to the first or second aspect, a water cooling jacket is provided in the supply pipe, and the supply pipe is cooled by passing cold water through the water cooling jacket. It is what.

According to a fourth aspect of the present invention, in the waste pyrolysis processing system according to any one of the first to third aspects , the process gas heating means is provided at a position downstream of the connection portion of the drain pipe in the supply pipe. It is characterized by providing .

According to a fifth aspect of the present invention, in the waste pyrolysis processing system according to the fourth aspect, the exhaust gas generated in the plant is used as a heat source for the heating means for the process gas .

According to a sixth aspect of the present invention, in the waste pyrolysis processing system according to the fourth aspect , the steam generated in the plant is used as a heat source for the process gas heating means .

The invention of claim 7 is a low molecular flammability by pyrolyzing an object to be treated such as waste in a pyrolysis furnace, and reforming an organic polymer gas generated by the pyrolysis by a gas reformer. As a gas, the low-molecular combustible gas is cooled by a gas cooler, washed with water by a gas purification device, the purified combustible process gas is attracted by a negative pressure by an induction blower, and a supply pipe by a supply blower In the waste pyrolysis processing system, which is supplied to the gas user through, the upper end of the drain pipe is connected to the bottom of each casing of the induction blower and the supply blower, and the lower end of the drain pipe is inserted into the drain pot. The blower is submerged in the water in the drain pot for a length sufficient for the maximum boosting capacity of each of the blowers .

According to an eighth aspect of the present invention, in the waste thermal decomposition treatment system according to the seventh aspect , a line for refluxing the process gas from the drain pipe to the suction side of each of the blowers is provided .

  ADVANTAGE OF THE INVENTION According to this invention, the waste water decomposition process system which can collect | recover continuously the drain water collected on piping and a blower, and can perform waste disposal stably over a long term can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of a waste pyrolysis processing system according to one embodiment of the present invention. In FIG. 1, an object to be processed such as waste is supplied into a thermal decomposition furnace 103 by a waste supply device 102 via a pretreatment device 101 that performs crushing and iron recovery. The waste is processed by pyrolysis at a temperature of about 550 ° C. in the pyrolysis furnace 103. As the pyrolysis furnace 103, for example, an externally heated rotary kiln for heating a rotary drum from the outside is generally used, and an organic polymer gas generated by pyrolysis in the pyrolysis furnace 103 is used as a gas reformer 104. Here, it is reformed at a temperature of about 1100 ° C. to become a low-molecular combustible gas. The combustible gas is transferred to the gas cooler 105 where it is rapidly cooled from about 900 ° C. to about 200 ° C. and then supplied to the gas purification device 106. In the gas purification device 106, the cooled gas is purified to obtain a combustible gas from which impurities are removed. The gas purification device 106 includes a bag filter and a gas cleaning device, removes carbon dust with the bag filter, and gas cleaning with water is performed by the gas cleaning device 106. The combustible gas purified by the gas purification device 106 is supplied to the gas use destination through the induction blower 107, the water seal device 108, and the supply blower 109.

  On the other hand, the residue generated in the pyrolysis furnace 103 is discharged to the outside of the pyrolysis furnace 103 through the residue discharge device 111, valuable metal is recovered by the residue cooling, pulverization, and separation device 112, and the carbon residue is transferred to the granulator 113. It is sent and recycled as a granulated product. The cleaning water used for gas cleaning in the gas purification device 106 is sent to the water treatment device 114, neutralized, absorbed and adsorbed, subjected to purification water, and returned to the gas purification device 106.

  Note that the pyrolysis furnace 103, the gas reformer 104, the gas cooler 105, and the gas purification device 106 are controlled by the induction blower 107 in a slightly negative pressure state, so that the main part does not enter excessive air from the outside. Is provided with a sealing structure. In the pyrolysis processing system shown in FIG. 1, a reformed gas that is a combustible gas of a secondary material generated in the pyrolysis processing system is reused as an energy source of the pyrolysis furnace 103. In addition, it is recirculated for temperature adjustment of main components. Further, surplus gas generated by the system is burned according to the exhaust gas standard in a combustion furnace or the like, and released into the atmosphere.

  FIG. 2 is a diagram showing a pipe drain recovery configuration in the waste pyrolysis system of the above embodiment. In FIG. 2, the process gas 1 whose pressure has been increased by the supply blower 109 is supplied to each gas utilization destination device, for example, a gas engine, a pyrolysis furnace 103, a gas reformer 104, and the like through a supply pipe 2. The supply pipe 2 is applied with a horizontal or slight negative gradient with respect to the gas flow direction, and one end of the drain pipe 3 is connected to a place where the supply pipe 2 turns to a positive gradient. The other end of the drain pipe 3 is submerged in the drain pot 4. The length of the submerged portion is a length corresponding to a margin L2 for the maximum boosting capability L1 of the supply blower 109. The drain pot 4 is provided with an overflow pipe 5 and a plugged cleaning port 6. On the other hand, the water supply jacket 2 is provided with a water cooling jacket 7 to allow the cold water 8 to pass therethrough. Cold water 8 is pumped from seawater or rivers and used after cooling.

  The supply pipe 2 after the drain pipe 3 always has a positive gradient with respect to the gas flow direction so that all drain water can be collected by the drain pipe 3. In the middle, when installing a gas flow meter, attach it to the vertical pipe. If the pipe has a negative slope, the drain pipe 3 is attached to the lowest part.

  With this configuration, the supply pipe 2 is cooled by the cold water 8, whereby moisture contained in the process gas 1 is condensed in the supply pipe 2 and becomes drain water. The drain water flows down in the drain pipe 3 and flows into the drain pot 4. Since the drain pipe 3 is submerged in the drain water of the drain pot 4 by the amount that the margin L2 is added to the maximum boosting capacity L1 of the supply blower 109, the process gas 1 does not blow out in the drain pot 4 and is safe. Drain water can be collected.

  Moreover, rust etc. generate | occur | produce in the inside of the supply piping 2 by gas supply for many years, The rust etc. are conveyed to the drain pot 4 with drain water, and settle to the bottom part of the drain pot 4. This sediment is washed away by opening the cleaning port 6 attached to the lower part of the drain pot 4. When the drain pot 4 is cleaned during operation, it can be performed in a state in which the gate valve 9 is closed to prevent intrusion of the atmosphere.

  FIG. 3 is a diagram showing a drain recovery structure for the blowers 107 and 109 for attracting and supplying the process gas 1 in the waste pyrolysis processing system of the above embodiment. Hereinafter, the blowers 107 and 109 will be described by using the blower 10 as a representative. In FIG. 3, the process gas 1 is pressurized by the blower 10. The blower 10 is boosted by an impeller 12 that rotates in the casing 11. The impeller 12 is rotated by a motor 13 and a drive shaft 14. Moisture accompanying the process gas 1 accumulates as drain water at the bottom of the casing 11. One end of a drain pipe 15 is connected to the bottom of the casing 11. The other end of the drain pipe 15 is submerged in the drain pot 16. The submerged length of the drain pipe 15 is a length corresponding to the maximum boosting capacity L1 of the blower 10 having a margin L2. The drain pot 16 is provided with an overflow pipe 17 and a plugged cleaning port 18. The drain water collected in the casing 11 may be mixed with precipitates to close the drain port. In order to prevent the drain port from being blocked, a reflux line for the process gas 1 is connected to the drain pipe 15. This recirculation line is constituted by a recirculation pipe 19 and a recirculation amount adjusting valve 20, and the process gas 1 can be flowed from the discharge side of the blower 10 to the suction side to prevent clogging.

  A bubbling pipe 22 is inserted toward the bottom of the drain pot 16, and the sediment accumulated at the bottom of the drain pot 16 is floated and stirred by the bubbles 23 discharged from the tip of the bubbling pipe 22 to form the precipitate 25. It is possible to discharge drain well by preventing accumulation. When the drain pot 16 is cleaned during operation, the gate valve 21 on the drain pipe 15 is closed to stop the process gas from being blown out, the cleaning port 18 is opened, and the deposit 25 and the like are scraped off and cleaned.

  When the process gas 1 is cooled, drainage is generated and the moisture in the gas becomes saturated. If the temperature further decreases from this state, further drainage is generated. In order to prevent this, a jacket 31 is provided on the supply pipe 2 on the discharge side of the blower 10 as shown in FIG. I try to heat it. As a result, the temperature of the process gas 1 can be increased to reduce the humidity, and the generation of drain at the gas supply destination can be prevented, and the gas can be supplied comfortably. In addition, as the high-temperature medium 32, combustion exhaust gas (exhaust gas from the pyrolysis furnace 103) generated in the present system or steam generated in the present system can be used. Operation becomes possible.

The block diagram of the waste pyrolysis processing system of one embodiment of this invention. Explanatory drawing of the drain apparatus with respect to the gas supply piping in the waste thermal decomposition processing system of the said embodiment. Explanatory drawing of the drain apparatus in the waste pyrolysis processing system of the said embodiment Explanatory drawing of the gas heating apparatus in the system of the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Process gas 2 Supply piping 3 Drain piping 4 Drain pot 5 Overflow piping 6 Cleaning port 7 Water cooling jacket 8 Cold water 10 Blower 11 Casing 15 Drain piping 16 Drain pot 19 Recirculation piping 20 Recirculation valve 31 Jacket 32 Heating medium

Claims (8)

In a waste pyrolysis system that treats waste and other materials to be treated by thermal decomposition,
Give the supply pipe that supplies process gas a horizontal or slight negative gradient in the gas flow direction, connect the upper end of the drain pipe to the point where the supply pipe turns to a positive gradient, and connect the lower end of the drain pipe A waste pyrolysis system characterized in that it is submerged by a length sufficient for the maximum pressure boosting capacity of a supply blower for supplying the process gas to a drain pot.   The waste pyrolysis system according to claim 1, wherein the drain pot is provided with a drain water overflow pipe and a plugged cleaning port.   The waste pyrolysis system according to claim 1 or 2, wherein a water cooling jacket is provided in the supply pipe, and the supply pipe is cooled by passing cold water through the water cooling jacket. The waste pyrolysis system according to any one of claims 1 to 3, wherein a process gas heating means is provided at a position downstream of a connection portion of the drain pipe in the supply pipe . The waste pyrolysis processing system according to claim 4, wherein combustion exhaust gas generated in the plant is used as a heat source for the heating means of the process gas . The waste pyrolysis processing system according to claim 4 , wherein steam generated in the plant is used as a heat source for the process gas heating means . An object to be treated such as waste is pyrolyzed in a pyrolysis furnace, and the organic polymer gas generated by the pyrolysis is reformed by a gas reformer to form a low-molecular combustible gas. The combustible gas is cooled by a gas cooler, washed with water by a gas purifier, the purified combustible process gas is attracted to a negative pressure by an induction blower, and supplied to a gas user through a supply pipe by a supply blower. In the waste pyrolysis treatment system
Connect the upper end of the drain pipe to the bottom of the casing of each of the induction blower and the supply blower, insert the lower end of the drain pipe into the drain pot, and only the length that has a margin for the maximum boosting capacity of each of the blowers A waste pyrolysis system characterized by being submerged in water in the drain pot . The waste pyrolysis system according to claim 7 , wherein a line for recirculating process gas is provided from the drain pipe to the suction side of each of the blowers .

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