JP2005265197A - Operation method for pyrolizing facility and pyrolizing facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To early detect leakage of decomposition gas from a seal part and prevent leakage of decomposition gas from the seal part. <P>SOLUTION: A gas sensor for detecting at least one kind of decompositon gas component is provided in the vicinity of an atmospheric air side of the seal parts 4, 6. Opening of an exhaust damper of an exhaust blower for exhausting combustion exhaust gas from a decomposition gas combustion furnace 16 for burning gas from a rotary furnace is increased to increase displacement based on a detection signal of the gas sensor, and pressure in the rotary furnace is reduced to prevent leakage of gas from the seal parts 4, 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to equipment for reducing and reducing the volume of raw materials containing various organic substances (solids containing various organic substances, various sludges, soils, etc.) by a thermal decomposition reaction, and in particular, thermal decomposition using a rotary furnace. The present invention relates to a method for operating a pyrolysis facility and a pyrolysis facility when pyrolysis gas leaks from a seal portion in the means.

  Various raw materials (materials to be treated), various organic substances, various sludges, soil, earth and sand, etc. are subjected to thermal decomposition reaction in a reducing atmosphere by indirect heating, and processing such as drying, carbonization, ashing, purification is added Things have been done. When using pyrolysis means that contains raw materials inside the rotary furnace and pyrolyzes the raw materials by indirect heating, stationary boxes (feeding of raw materials and discharging processed products) are provided at both ends of the rotary furnace via sealing means. ). The sealing means is extremely important, and when it deteriorates, air may enter from the outside and the internal raw materials may ignite. In addition, internal decomposition gas may leak, and odor may also leak at the same time. Therefore, the sealing function is maintained by maintenance (periodic retightening and replacement) of the sealing means.

Patent document 1 is known as what prevents the leakage of this gas. This technique is a technique for providing gas collecting means for surrounding the seal portion and collecting the decomposition gas leaked from the seal portion, and introducing the collected gas into a separate chamber. Moreover, if the pressure in the rotary furnace is operating at a negative pressure, the internal cracked gas will not leak from the seal part, but if the amount of generated gas increases rapidly, The pressure became positive and leaked.
Japanese Patent Laid-Open No. 10-206021

  As described above, collecting and processing the gas leaked from the seal portion is an effective means that does not diffuse malodors, etc., but it is also possible to detect the leak early and control the operation of the thermal decomposition facility. is important. Gas leakage from the seal part means that the amount of generated gas is large. By simply collecting the gas with the gas collecting means, introducing it into the combustion furnace and burning it, a stable countermeasure against cracked gas leakage is possible. Can not do.

  The inventor has created a means for early detection of cracked gas leaks and early countermeasures. That is, attention was paid to the fact that the gas can be known to leak by collecting the gas component of the seal portion and detecting the change in the gas component. In addition, early detection and early countermeasures are required so that cracked gas leaks from the seal part can be detected early and the operator can be informed early so that the situation of the facility and leakage countermeasures can be taken. . That is, a gas sensor is provided in the vicinity of the seal portion, and a cracked gas component generated from the raw material is detected by this gas sensor. This detection means that the amount of gas generated in the rotary furnace has increased rapidly and the pressure in the rotary furnace has increased, and in order to reduce the pressure, the amount of gas commensurate with the amount of gas increase is exhausted. It is necessary to.

  To do so, control the exhaust damper in the rear stage of the exhaust blower (increase the opening) and control the exhaust volume to increase the pressure in the gas combustion furnace and rotary furnace. Focused on the need for Furthermore, we focused on increasing the transport force of the ejector that sucks the cracked gas from the rotary furnace. Focusing on this fact, we focused on the fact that early detection and early countermeasures for cracked gas leakage can be implemented.

  The present invention has been made to solve the above-described problems, and is capable of detecting the leakage of cracked gas from the seal portion at an early stage and capable of preventing gas leak from the seal portion. The purpose is to obtain a facility operating method and a pyrolysis facility.

  In the operation method of the thermal decomposition facility according to the first aspect of the present invention, stationary boxes are provided at both ends of the rotary furnace via seals, the raw material is stored inside the rotary furnace, and the raw material is pyrolyzed by indirect heating. In a method for operating a thermal decomposition facility equipped with a thermal decomposition means, a gas sensor for detecting at least one kind of decomposition gas component generated by thermal decomposition is provided in the vicinity of the atmosphere side of the seal portion, and gas for combusting gas from a rotary furnace Combustion means is provided, and based on the detection signal of the gas sensor, the damper opening of the exhaust blower that discharges the combustion exhaust gas from the gas combustion means is increased to increase the exhaust amount, and the rotary furnace pressure is reduced. is there.

  The operation method of the thermal decomposition facility according to claim 2 is a thermal decomposition means in which stationary boxes are provided at both ends of the rotary furnace via seals, the raw material is stored inside the rotary furnace, and the raw material is thermally decomposed by indirect heating. And a gas combustion means for combusting a gas from the rotary furnace while providing a gas sensor for detecting at least one kind of cracked gas component generated by pyrolysis near the atmosphere side of the seal portion And the amount of air blown by the ejector for introducing the gas in the rotary furnace into the gas combustion furnace is increased based on the detection signal of the gas sensor, and the pressure in the rotary furnace is reduced.

  The pyrolysis facility according to claim 3 is provided with a stationary box at both ends of the rotary furnace via seals, a thermal decomposition means for storing the raw material in the rotary furnace and thermally decomposing the raw material by indirect heating, A gas combustion means for burning the cracked gas generated by the decomposition, an exhaust blower for exhausting the combustion exhaust gas from the gas combustion means, a gas sensor provided in the vicinity of the atmosphere side of the seal portion and detecting at least one kind of the cracked gas component; And an exhaust damper that controls the exhaust amount of the exhaust blower and largely controls the damper opening based on the detection signal of the gas sensor.

  The thermal decomposition facility according to claim 4 is provided with an ejector for introducing the cracked gas from the rotary furnace to the gas combustion means and for controlling the air flow rate based on the detection signal of the gas sensor.

  The pyrolysis facility according to claim 5 is provided with an alarm device for issuing an alarm based on the detection signal of the gas sensor.

  As described above, according to the present invention, the gas sensor for detecting at least one kind of decomposition gas component generated by thermal decomposition is provided in the vicinity of the atmosphere side of the seal portion, and the leak of the decomposition gas from the seal portion is detected early. can do. In addition, an alarm is issued in response to a detection signal from the gas sensor, so that a leak of cracked gas can be detected at an early stage. Also, the damper opening of the exhaust damper of the exhaust blower that discharges the combustion exhaust gas from the gas combustion means is increased based on the detection signal of the gas sensor, thereby increasing the exhaust amount and reducing the pressure in the rotary furnace. Thus, leakage of gas from the seal portion can be prevented. In addition, based on the detection signal of the gas sensor, the amount of air blown by the ejector that introduces the gas in the rotary furnace into the gas combustion furnace is increased, whereby the pressure in the rotary furnace can be reduced, and the gas from the seal portion can be reduced. Leakage can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a thermal decomposition facility according to the best mode of the present invention. Reference numeral 1 denotes a rotary furnace to which raw materials are supplied, and it is possible to dry and thermally decompose a workpiece by indirect heating. An external heating means 2 for heating the rotary furnace 1 from the outside is provided around the rotary furnace 1, and hot air gas is introduced into the external heating means 2 from the hot air furnace 3. After heating, it is discharged and circulated. A rotary heat treatment furnace is formed by the rotary furnace 1 and the external heating means 2, and is used as a drying furnace (heating hot air temperature 300 to 450 ° C.), a carbonizing furnace (heating hot air temperature 400 to 650 ° C.), and the like.

  An input box (stationary box) 5 to be processed is provided on one end side of the rotary furnace 1 via a seal portion 4, and a discharge box (stationary box) is also provided on the other end side of the rotary furnace 1 via a seal portion 6. ) 7 is provided. In addition, annular protrusions 1 a and 1 b are provided at both ends of the rotary furnace 1, and the protrusions 1 a and 1 b are rotatably supported by rotation support rollers 8 and 9. A sprocket 10 is provided on the end side of the protruding portion 1b in the rotary furnace 1, and the chain 11 engaged with the sprocket 10 engages with a sprocket 13 attached to a motor 12 as a drive source.

  An object to be processed introduced from the introduction box 5 is introduced into the rotary furnace 1 through the guide 14. The rotary furnace 1 is rotationally driven by a motor 12, and the workpiece introduced into the rotary furnace 1 is transferred to the discharge side while being stirred. The inside of the rotary furnace 1 is heated to a predetermined temperature by hot air gas, the object to be processed is dried by indirect heating (moisture removal) to become a dried substance, and the dried substance is further pyrolyzed (carbonized) by indirect heating to become a carbide. These dried products and carbides are taken out as processed products through the discharge box 7. Further, pyrolysis gas and the like generated in the rotary furnace 1 are sucked out of the discharge box 7 by the ejector 15 and taken out, and sent to the cracked gas combustion furnace 16 for combustion purification.

  Further, collection ducts 17 and 18 are provided so as to surround the seal portions 4 and 6, and the decomposition gas leaked from the seal portions 4 and 6 is collected. Gas sensors 19 and 20 are provided in the vicinity of the atmosphere of the seal portions 4 and 6, here in the collection ducts 17 and 18. The gas sensors 19 and 20 detect at least one kind of cracked gas component. The cracked gas components vary depending on the raw materials, and are, for example, hydrocarbons (methane, ethylene, acetylene, etc.), hydrogen, NOx, SOx, CO, CO2, and the like. When the gas sensors 19 and 20 detect the leakage of cracked gas from the seal portions 4 and 6, this detection signal is sent to the alarm device 21, and a buzzer sounds or a gas leak is displayed on the monitoring screen. The gas sensors 19 and 20 may be provided in a plurality of types or in a plurality of locations.

  The combustion exhaust gas from the cracked gas combustion furnace 16 is cooled by the heat exchanger 22 and discharged through the bag filter 23 by the exhaust blower 24. At this time, the gas leak detection signal of the gas sensors 19 and 20 is received, the opening of the exhaust damper 25 of the exhaust blower 24 is increased, the amount of exhaust from the cracked gas combustion furnace 16 is increased, and the pressure in the rotary furnace 1 is increased. And the leakage of cracked gas from the seal portions 4 and 6 is prevented. The pressure in the rotary furnace 1 is usually a negative pressure (for example, −8 to −3 mmH 2 O). However, when the cracked gas is suddenly generated or when the packing is deteriorated, the cracked gas enters the atmosphere from the packing portion. Leaks and disperses odor. In such a case, leakage of cracked gas is prevented by increasing the displacement and reducing the pressure in the rotary furnace 1 as described above. Further, the pressure in the rotary furnace 1 can be reduced by increasing the amount of air blown from the ejector 15 that feeds the gas in the rotary furnace 1 to the cracked gas combustion furnace 16 in response to the gas leak detection signals from the gas sensors 19 and 20. Can be achieved.

  FIG. 2 shows an enlarged vertical cross-sectional view of the main part of FIG. 1. A cylindrical part 7 b into which the end of the rotary furnace 1 is inserted is formed on the inner wall part 7 a of the discharge box 7. A cylindrical portion 1c located on the side is formed, a gland packing 26 is disposed between the cylindrical portions 1c and 7b, and a packing presser 28 is attached to the cylindrical portion 1c via an auxiliary seal member 27 made of ceramics. An auxiliary seal member 29 made of ceramics is also disposed between the inner wall portion 7a of the discharge box 7 and the packing presser 28, and the seal portion 6 is formed thereby. A collection duct 18 is provided so as to cover the seal portion 6, and the decomposition gas leaking from the gland packing 26 is collected by the collection duct 18. A gas sensor 20 is provided in the collection duct 18 to detect a component of the collected gas.

  3A shows adjustment of the flow rate of the combustion exhaust gas from the cracked gas combustion furnace 16 by controlling the opening degree of the exhaust damper 25, the exhaust blower 24 is operated at a constant rotational speed, and gas leaks are detected by the gas sensors 19, 20. If so, the opening degree of the exhaust damper 25 is increased to increase the exhaust air volume. As a result, the pressure in the cracked gas combustion furnace 16 is lowered, and the pressure in the rotary furnace 1 is also lowered, thereby preventing the cracked gas from leaking from the seal portions 4 and 6. In the case of FIG. 3B, when the gas sensors 19 and 20 detect gas leakage from the seal portions 4 and 6, the opening degree of the introduction damper 30 of the ejector 15 having the motor 15a is increased to rotate. The amount of air introduced from the furnace 1 to the cracked gas combustion furnace 16 via the pipe 31 is increased, thereby reducing the pressure in the rotary furnace 1 and preventing leakage of cracked gas from the seal portions 4 and 6.

  As described above, the opening degree control of the exhaust damper 25 and the opening degree control of the introduction damper 30 are automatically performed in response to the detection signals of the gas sensors 19 and 20, but the opening degree control may be performed manually. Good. In the case of manual operation, the opening setting value is changed manually.

  In the above-described best embodiment, a gas sensor for detecting at least one kind of cracked gas is provided in the vicinity of the atmosphere of the seal portion, so that gas leakage from the seal portions 4 and 6 can be detected at an early stage. In addition, an alarm device for receiving an alarm signal from the gas sensor and providing an alarm is provided, which also enables early detection. Further, based on the detection signal of the gas sensor, the opening amount of the exhaust blower of the exhaust blower for discharging the combustion exhaust gas from the cracked gas combustion furnace 16 is increased to increase the exhaust amount, and the pressure in the rotary furnace is reduced. Gas leakage from the seal portions 4 and 6 can be prevented. Further, based on the detection signal of the gas sensor, the amount of air blown from the ejector 15 for introducing the gas in the rotary furnace 1 into the cracked gas combustion furnace 16 is increased, whereby the pressure in the rotary furnace 1 is reduced and the seal is sealed. Gas leakage from the parts 4 and 6 is prevented.

It is a block diagram of the thermal decomposition facility by this embodiment best mode. It is a principal part longitudinal cross-sectional enlarged view of FIG. It is explanatory drawing of the air volume adjustment of the combustion exhaust gas and cracked gas by the exhaust blower and ejector by this Embodiment best mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotary furnace 2 ... External heating means 4, 6 ... Seal part 5, 7 ... Static box 15 ... Ejector 16 ... Decomposition gas combustion furnace 17, 18 ... Collection duct 19, 20 ... Gas sensor 21 ... Alarm device 24 ... Exhaust blower 25 ... Exhaust damper 30 ... Introduction damper

Claims (5)

  In the operation method of the thermal decomposition facility, the sealing portion is provided with a stationary box at both ends of the rotary furnace via the seal portion, and the thermal furnace is provided with a thermal decomposition means for storing the raw material in the rotary furnace and thermally decomposing the raw material by indirect heating. A gas sensor for detecting at least one kind of cracked gas component generated by thermal decomposition is provided in the vicinity of the atmosphere side, and a gas combustion means for combusting the gas from the rotary furnace is provided. From the gas combustion means based on the detection signal of the gas sensor The operation method of the thermal decomposition facility characterized by enlarging the damper opening of the exhaust damper of the exhaust blower that discharges the combustion exhaust gas, increasing the exhaust amount, and reducing the pressure in the rotary furnace.   In the operation method of the thermal decomposition facility, the sealing portion is provided with a stationary box at both ends of the rotary furnace via the seal portion, and the thermal furnace is provided with a thermal decomposition means for storing the raw material in the rotary furnace and thermally decomposing the raw material by indirect heating. A gas sensor for detecting at least one kind of cracked gas component generated by thermal decomposition is provided in the vicinity of the atmosphere side, and a gas combustion means for combusting the gas from the rotary furnace is provided. Based on the detection signal of the gas sensor, The operation method of the thermal decomposition facility characterized by increasing the blowing volume of the ejector which introduces this gas into the gas combustion furnace, and reducing the pressure in the rotary furnace.   A stationary box is provided at both ends of the rotary furnace via seals, a thermal decomposition means for storing the raw material in the rotary furnace and thermally decomposing the raw material by indirect heating, and a gas for burning the cracked gas generated by the thermal decomposition A combustion means, an exhaust blower that exhausts combustion exhaust gas from the gas combustion means, a gas sensor that is provided near the atmosphere side of the seal portion and detects at least one kind of decomposition gas component, and controls the exhaust amount of the exhaust blower; A pyrolysis facility comprising an exhaust damper whose damper opening is largely controlled based on a detection signal of a gas sensor.   The thermal decomposition facility according to claim 3, further comprising an ejector that introduces the cracked gas from the rotary furnace into the gas combustion means and that controls an air flow rate based on a detection signal of the gas sensor. The pyrolysis facility according to claim 3 or 4, further comprising an alarm device for transmitting an alarm based on a detection signal of the gas sensor.

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