JP4551774B2 - Pyrolysis treatment system - Google Patents

Description

  The present invention relates to a thermal decomposition processing system having a thermal decomposition furnace for processing an object to be processed such as waste by thermal decomposition and a gas dehumidifying device, and in particular, removes chemical substances adhering in the gas dehumidifying device. The present invention relates to a thermal decomposition treatment system.

  2. Description of the Related Art Conventionally, there has been known a thermal decomposition processing system that thermally decomposes and processes unsorted and untreated waste containing various pollutants (see, for example, Patent Document 1).

  In this pyrolysis treatment system, waste containing organic matter is indirectly heated under the air shut-off condition using a high-temperature combustion gas obtained by burning fuel and air as a heat source. A pyrolysis device that decomposes into residue, an oxidant gas containing air or oxygen, and a pyrolysis gas obtained by the pyrolysis device are introduced, and combustible components contained in the pyrolysis gas and oxygen in the oxidant gas A gas reforming device that causes a high-temperature hydrocarbon in the pyrolysis gas to be converted into a low-level hydrocarbon or the like, and a gas cooling device that rapidly cools the high-temperature gas obtained by the gas reforming device, A gas cleaning device is provided for introducing gas from the gas cooling device and purifying dust and harmful components contained in the gas.

  The pyrolysis gasification and melting system also includes a gas cooling device that rapidly cools the high-temperature pyrolysis gas obtained by the pyrolysis device, and a gas contained in the gas introduced from the gas cooling device. And a gas cleaning device for purifying harmful components.

  The gas thus obtained has flammability and is effectively used as fuel in the system. In this case, when a wet purification device is used as the gas cleaning device, moisture is contained in the obtained gas, and moisture in the gas condenses and accumulates as moisture when the temperature of the gas decreases in the subsequent stage, causing corrosion, It may cause clogging.

In order to solve such a problem, a thermal decomposition treatment system having a gas dehumidifying device that dehumidifies moisture from gas is known (see, for example, Patent Document 2).
JP 2000-202419 A JP 2004-92611 A

  However, in a pyrolysis processing system having such a gas dehumidifying device, when trace chemical substances in the gas adhere to the components of the gas dehumidifying device after operating for a long time, the components of the gas dehumidifying device, for example, It is assumed that the heat transfer tube of the cooler is blocked.

  In this case, it is necessary to disassemble the components of the gas dehumidifier and perform a cleaning operation. During this time, gas cannot be supplied to the gas user.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a thermal decomposition treatment system that can safely remove deposits without disassembling the components of the gas dehumidifier. .

  The present invention includes a pyrolysis furnace that pyrolyzes an object to be treated such as waste to generate pyrolysis gas, a gas dehumidifier that reduces moisture in the pyrolysis gas from the pyrolysis furnace, and a gas reduction device. A thermal decomposition treatment system comprising: a blower that feeds a high-temperature gas into a humidifier and removes chemical substances adhering to the gas dehumidifier.

  In the present invention, a surplus gas combustion furnace is connected to the gas dehumidifier, the outlet side of the surplus gas combustion furnace and the inlet side of the blower are connected, and the high temperature gas discharged from the surplus gas combustion furnace by the blower is gas It is a thermal decomposition processing system characterized by being sent to a dehumidifier.

  The present invention is characterized in that a city gas combustor operated by city gas is connected to the inlet side of the blower, and high-temperature gas exhausted from the city gas combustor by the blower is sent to the gas dehumidifier. It is a decomposition processing system.

  The present invention is a pyrolysis processing system, wherein the city gas combustor is a gas engine that pyrolyzes an object to be processed to generate pyrolysis gas.

  The present invention is a thermal decomposition treatment system characterized in that a combustion exhaust gas exhaust tower is connected to the outlet side of the surplus gas combustion furnace.

  In the present invention, an air inlet is connected to the inlet side of the blower via a control valve, and a thermometer for measuring the temperature of the hot gas after removal of the chemical substance is installed on the outlet side of the gas dehumidifying device. The control valve is opened and closed by the control device based on the signal from the thermal decomposition processing system.

  As described above, according to the present invention, the chemical substance adhering to the gas dehumidifier can be removed by evaporation or sublimation by feeding the high temperature gas from the blower into the gas dehumidifier.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  1 and 3 are views showing a first embodiment of a thermal decomposition processing system according to the present invention.

  The pyrolysis processing system includes a pretreatment device 1 that crushes and sorts a workpiece such as waste, a pyrolysis furnace 2 that pyrolyzes the workpiece to generate pyrolysis gas, and a pyrolysis furnace 2. From the gas reformer 3 for reforming the generated pyrolysis gas, the gas cooling / purification device 4 for rapidly cooling the reformed gas (combustible gas) from the gas reformer 3, and the gas cooling / purification device 4 And a gas supply device 5 that pumps combustible gas.

  A gas dehumidifying device 6 is connected to the downstream side of the gas supply device 5 via a gate valve 11, and a gas utilization destination 7 is connected to the downstream side of the gas dehumidifying device 6 via a gate valve 12. Yes. Among these, the gas utilization destination 7 may be a gas engine, a pyrolysis furnace, or the like. Further, the exhaust gas from the gas use destination 7 is discharged outward from the combustion exhaust gas exhaust tower 10.

  Further, a surplus gas combustion furnace 9 is connected to the gas dehumidifier 6 through a gate valve 16, and exhaust gas from the surplus gas combustion furnace 9 is discharged outward from the combustion exhaust gas exhaust tower 10.

  The gas supply device 5 is also connected to a surplus gas combustion furnace 9 via a gate valve 8.

  A circulation blower (blower) 13 is connected to the outlet side of the surplus gas combustion furnace 9 via an inlet valve 14, and the circulation blower 13 is connected to the inlet side of the gas dehumidifier 6 via an outlet valve 15. ing. Further, the outlet side of the gas dehumidifier 6 is connected to the surplus gas combustion furnace 9 via a thermometer 18 and an outlet valve 16.

  An air intake port 19 a is connected to the inlet side of the inlet valve 14 via a control valve 19. The control valve 19 and the circulation blower 13 are driven and controlled by a temperature control device 17 based on a signal from a thermometer 18. Is done.

  As shown in FIG. 3, the gas dehumidifying device 6 includes a gas cooler 61 having a heat transfer device 61a through which combustible gas flows, a demister 62 having a collision mesh portion 62a, and a heat transfer tube 63a through which combustible gas flows. And a heater 63 having

  Among these, the combustible gas flowing through the heat transfer tube 61a of the gas cooler 61 is cooled by the cooling water sent from the chiller. The combustible gas flowing through the heat transfer tube 63a of the heater 63 is heated by steam sent from the boiler.

  Next, the operation of the present embodiment having such a configuration will be described.

  In FIG. 1, an object to be processed such as waste is crushed and sorted in a pretreatment apparatus 1 and supplied to a pyrolysis furnace 2. The workpiece is then processed by pyrolysis at a temperature of about 550 ° C. in the pyrolysis furnace 2. The pyrolysis furnace 2 is composed of, for example, an externally heated rotary kiln that heats a rotary drum from the outside.

  Next, the organic polymer gas generated by pyrolysis in the pyrolysis furnace 2 is sent to the gas reformer 3, where the polymer gas is reformed at a temperature of about 1100 ° C. It is converted into lower hydrocarbons and becomes flammable gas.

  Next, the reformed gas reformed by the gas reformer is rapidly cooled from about 900 ° C. to about 200 ° C. by the gas cooling / purifying device 4, the carbon dust is removed, the gas is washed with water, and harmful substances are removed. Removed.

  The combustible gas purified by the gas cooling / purifying device 4 is pumped by the gas supply device 5 constituted by a blower or the like, and the moisture in the combustible gas is dehumidified by the gas dehumidifying device 6. To be supplied.

  In the pyrolysis processing system of the present invention, the combustible gas generated by the pyrolysis furnace 2 and the gas reformer 3 is used in the gas utilization destination 7, for example, the energy source of the pyrolysis furnace 2 or the fuel of the gas engine described above. The exhaust gas that has been reused and combusted in the gas utilization destination 7 is discharged from the combustion gas exhaust tower 10 to the atmosphere. Further, surplus gas of the combustible gas is sent from the gas supply device 5 to the surplus gas combustion furnace 9 through the gate valve 8 and burned, and the exhaust gas burned in the surplus gas combustion furnace 9 is sent from the combustion exhaust gas exhaust tower 10 to the atmosphere. To be released.

  During this time, the chemical substances in the combustible gas are crystallized and adhered to the components of the gas dehumidifier 6 shown in FIG. 3, for example, the components such as the gas cooler 61, the demister 62, and the heater 63. May occur. In this case, the operation is switched to the chemical substance removal operation based on the pressure loss measured by the pressure gauge 6a.

  Specifically, as shown in FIG. 1, the front and rear gate valves 11 and 12 of the gas dehumidifying device 6 are closed, and the inlet valve 14 and outlet valve 15 of the circulation blower 13 and the outlet valve 16 of the gas dehumidifying device 6 are opened. The high-temperature exhaust gas from the surplus gas combustion furnace 9 is circulated through the inlet valve 14, the circulation blower 13, the outlet valve 15, the gas dehumidifier 6 and the outlet valve 16. At this time, the cooling water of the cooler 61 of the gas dehumidifier 6 is stopped.

  Further, in order to adjust the temperature of the circulating high-temperature exhaust gas, the control valve 19 is driven to open and close by the temperature controller 17 based on a signal from the thermometer 18. Specifically, in order to keep the temperature of the thermometer 18 provided on the outlet side of the gas dehumidifier 6 at a predetermined temperature, a signal from the thermometer 18 is input to the temperature controller 17, and the temperature controller 17 The opening degree of the control valve 19 is adjusted to adjust the amount of cooling air supplied from the air intake port 19a into the high-temperature exhaust gas.

  The temperature of the hot exhaust gas circulated by the circulation blower 13 can also be adjusted by adjusting the rotational speed of the circulation blower 13.

  In this way, by supplying high-temperature exhaust gas of a predetermined temperature from the circulation blower 13 into the gas dehumidifying device 6, the chemical substances attached to the components in the gas dehumidifying device 6 are evaporated or sublimated effectively. Can be removed.

  Thereafter, the chemical substance removal operation is stopped and switched to the normal operation described above.

  As described above, according to the present embodiment, it is possible to effectively remove chemical substances attached to the components of the gas dehumidifying device 6 without decomposing the gas dehumidifying device 6.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment shown in FIG. 2, the same parts as those in the first embodiment shown in FIGS. 1 and 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 2, the gas use destination 7 is a city gas combustion furnace such as a gas engine that can be operated by city gas, the pyrolysis furnace 2, and the high-temperature exhaust gas exhausted from the gas use destination 7 is an inlet valve. 14 is sent to the circulation blower 13, the outlet valve 15, and the gas dehumidifying device 6.

  As shown in FIG. 2, chemical substances in the combustible gas may crystallize and adhere to the component parts 61, 62, 63, etc. of the gas dehumidifying device 6 and cause pressure loss. In this case, the operation is switched to the chemical substance removal operation based on the pressure loss measured by the pressure gauge 6a.

  Specifically, as shown in FIG. 2, the front and rear gate valves 11 and 12 of the gas dehumidifier 6 are closed. Next, one of the devices at the gas usage destination 7 is operated with city gas. Thereafter, the inlet valve 14, the outlet valve 15, and the outlet valve 16 are opened, and the combustion exhaust gas of the gas utilization destination 7 is taken into the circulation blower 13 through the inlet valve 14, and then the gas is reduced from the circulation blower 13 through the outlet valve 15. It is sent to the wet device 6 to circulate the combustion exhaust gas. During this time, the cooling water of the cooler 61 of the gas dehumidifier 6 is stopped.

  Further, in order to adjust the temperature of the circulating high-temperature exhaust gas, the control valve 19 is driven to open and close by the temperature controller 17 based on a signal from the thermometer 18. Specifically, in order to keep the temperature of the thermometer 18 provided on the outlet side of the gas dehumidifier 6 at a predetermined temperature, a signal from the thermometer 18 is input to the temperature controller 17, and the temperature controller 17 The opening degree of the control valve 19 is adjusted to adjust the amount of cooling air supplied from the air intake port 19a into the high-temperature exhaust gas.

  The temperature of the hot exhaust gas circulated by the circulation blower 13 can also be adjusted by adjusting the rotational speed of the circulation blower 13.

  By the way, in the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 2, the exhaust gas from the gas dehumidifier 6 is burned by excess gas during the chemical substance removal operation of the gas dehumidifier 6. Although not limited to this, the exhaust gas from the gas dehumidifier 6 may be sent directly to the combustion exhaust gas exhaust tower 10 without being sent to the surplus gas combustion furnace 9.

The block diagram which shows 1st Embodiment of the thermal decomposition processing system by this invention. The block diagram which shows 2nd Embodiment of the thermal decomposition processing system by this invention. The figure which shows the gas dehumidification apparatus used for the thermal decomposition process by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pretreatment apparatus 2 Pyrolysis furnace 3 Gas reformer 4 Gas cooling / purification apparatus 5 Gas supply apparatus 6 Gas dehumidification apparatus 7 Gas utilization place 8 Gate valve 9 Excess gas combustion furnace 10 Exhaust gas exhaust tower 11, 12 Gate valve 13 Circulating Blower 14 Inlet Valves 15 and 16 Outlet Valve 17 Temperature Control Device 18 Thermometer 19 Air Intake Valve

Claims (5)

A pyrolysis furnace that pyrolyzes an object to be treated such as waste to generate pyrolysis gas;
A gas dehumidifier comprising components that reduce the moisture in the pyrolysis gas from the pyrolysis furnace and crystallize and adhere to the chemicals in the pyrolysis gas ,
A blower that sends high-temperature gas into the gas dehumidifier and removes chemical substances adhering to the components in the gas dehumidifier,
A thermal decomposition treatment system comprising:   A surplus gas combustion furnace is connected to the gas dehumidifier, the outlet side of the surplus gas combustion furnace and the inlet side of the blower are connected, and the high temperature gas discharged from the surplus gas combustion furnace by the blower to the gas dehumidifier The thermal decomposition treatment system according to claim 1, wherein the thermal decomposition treatment system is sent.   The city gas combustor operated by city gas is connected to the inlet side of the blower, and the high temperature gas exhausted from the city gas combustor by the blower is sent to the gas dehumidifier. Pyrolysis treatment system. The thermal decomposition treatment system according to claim 2 , wherein a combustion exhaust gas exhaust tower is connected to an outlet side of the surplus gas combustion furnace. An air intake is connected to the inlet side of the blower via a control valve,
A thermometer is installed on the outlet side of the gas dehumidifier to measure the temperature of the hot gas after removal of chemical substances.
2. The thermal decomposition treatment system according to claim 1, wherein the control valve is driven to open and close based on a signal from the thermometer.

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