JP4255066B2 - Exhaust gas treatment method and mechanism in carbonization apparatus - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a carbonization apparatus, and in particular, in a rotary type carbonization apparatus, an exhaust gas treatment method in a carbonization apparatus capable of effectively preventing generation of clinker due to a high temperature of exhaust gas in a rotating drum, and its It concerns the mechanism.

Conventionally, human waste sludge, sawdust, pulp sludge, animal manure, etc. have been carbonized and reused as soil conditioners, deodorizers, snow melting agents, etc. A carbonization apparatus 1 'as shown is used.
This is configured by applying a so-called rotary kiln type carbonization furnace 1A. The workpiece is put into the rotary drum 10 ', and the workpiece is placed by the lifter 10a' provided in the rotary drum 10 '. It is transported with stirring to achieve drying, partial combustion, and carbonization. The exhaust gas G discharged from the rotating drum 10 'is guided to the reburning furnace 2' where it is burned, deodorized and harmful substances removed, and then discharged outside (patent) Reference 1).

By the way, in the carbonization apparatus 1 ′, the amount of hot air supplied to the rotary drum 10 ′ is suppressed so that the workpiece is not combusted in the rotary drum 10 ′ (air ratio mf = 1. 0 or less), the rotary drum 10 'is in a negative pressure state. The temperature in the flue duct 14 'is in a high temperature state of 1100 ° C to 1300 ° C. For this reason, when dust generated from the object to be processed adheres to the flue duct 14 ′, the dust is melted and a clinker is generated, which may reduce the cross-sectional area of the flue and increase the exhaust resistance. is there.
When this clinker grows, the rotary drum 10 'cannot be maintained at a negative pressure, and harmful carbon monoxide gas or the like leaks out. Therefore, the apparatus is periodically stopped to enter the flue duct 14'. The resulting clinker must be removed, which can be very expensive.
Japanese Patent Laid-Open No. 2002-20759 (FIG. 5)

  The present invention has been made in view of such a background, and by preventing the generation of clinker in the carbonization apparatus, it is possible to realize a stable operation of the apparatus and reduce the maintenance cost. The technical problem is to develop an exhaust gas treatment method and a mechanism thereof in a carbonization apparatus.

That is, the exhaust gas treatment method in the carbonization apparatus according to claim 1 is to put the object to be processed into the rotating drum in the carbonizing apparatus, and further supply hot air into the rotating drum to carbonize the object to be processed, and the rotating drum. In the operation of the carbonizing apparatus in which the exhaust gas discharged from the exhaust gas is guided to the reburning furnace and discharged to the outside, the lid that closes the end of the rotating drum has a flue with a flue inside A duct is connected, and an exhaust port formed in the flue duct and an air supply port in the reburning furnace are connected by an appropriate pipe line, and combustion used for combustion in the reburning furnace air, are those comprising as a feature to be supplied to the flue duct.
According to this invention, since the atmospheric temperature in the flue duct is lowered, the dust adhering to the flue duct is not melted, and the generation of the clinker can be prevented. Further, the air supplied into the flue duct is supplied to the reburning furnace and used for combustion here.

According to a second aspect of the present invention, there is provided an exhaust gas treatment mechanism for a carbonization apparatus, wherein an object to be treated is introduced into a rotating drum, and hot air is further supplied into the rotating drum to carbonize the object to be treated and discharged from the rotating drum. In the carbonization apparatus that discharges the exhaust gas after being guided to the reburning furnace and discharged to the outside, the lid that closes the end of the rotating drum is connected to a flue duct having an internal flue, a flue duct to form an exhaust port, between the air inlet in the relapse furnace is intended to be connected by a suitable conduit, the combustion air supplied for combustion in the relapse furnace, the smoke It is characterized in that it is configured to be supplied into the road duct.
According to this invention, since the atmospheric temperature in the flue duct is lowered, the dust adhering to the flue duct is not melted, and the generation of the clinker can be prevented. Further, the air supplied into the flue duct is supplied to the reburning furnace and used for combustion here.

Furthermore, the exhaust gas treatment mechanism in the carbonization apparatus according to claim 3 is characterized in that, in addition to the requirement of claim 2, the air supply port for the combustion air formed in the air diffuser pipe is exposed in the flue duct. It consists of
According to the present invention, it is possible to prevent dust from adhering to the flue duct and to prevent generation of clinker.
The above problems can be solved by using the configuration of the invention described in each of the claims as a means.

  According to the present invention, by preventing the generation of clinker in the carbonization apparatus, stable operation of the carbonization apparatus can be realized, and the maintenance cost can be reduced.

  Hereinafter, an exhaust gas treatment method and its mechanism in the carbonization apparatus of the present invention will be described with reference to the drawings. First, the carbonization apparatus 1 and the reburning furnace 2 in which the exhaust gas treatment mechanism is formed will be described, and then these apparatuses were used. An exhaust gas treatment method will be described.

  In the figure, reference numeral 1 denotes a carbonization apparatus, which has four support rollers R arranged on a machine frame F provided on a base B, and a cylindrical rotating drum on these support rollers R. 10 is inclined and mounted. The chain 11 is wound around a sprocket attached to the outer periphery of the rotating drum 10 and a sprocket provided on the output shaft of the motor M, and the rotating drum 10 is rotationally driven by the motor M. A plurality of lifters 10 a are provided on the inner peripheral surface of the rotating drum 10, and the lifters 10 a are plate-like members to which an object to be processed is attached along the longitudinal direction of the rotating drum 10. Further, both ends of the rotary drum 10 are closed by lids 10A and 10B fixed to the machine frame F, and the boundary portions are sealed.

  The one lid body 10A is provided with a charging device 12 to which a screw conveyor is applied as an example so that the discharging portion faces the inside of the rotary drum 10, and the charging device 12 has a hopper-like shape. An inlet 13 is formed. The lid 10A is connected with a flue duct 14 having an exhaust port 14a. The flue duct 14 has an L-shaped flue 14b as an example. Further, the flue duct 14 is provided with a diffuser tube 15, which will be described in detail later.

  The other lid 10B is connected to a discharge duct 16 in which a discharge port 16a is formed, and a burner 17 is connected to a hot air blowing port 16b formed in the discharge duct 16. It is. Further, a blower 18 is connected to an air supply port 16c formed in the lid 10B by a combustion air pipe P1, and a damper D1 is provided between the blower 18 and the air supply port 16c. Further, the blower 18 is connected to a diffuser pipe 15 provided in the flue duct 14 by a combustion air pipe P <b> 2, and a damper D <b> 2 is provided between the diffuser pipe 15 and the blower 18.

The air diffuser 15 will now be described. As shown in FIG. 3, the air diffuser 15 is formed by closing one end of a cylindrical member and forming an air supply port 15a around it, and blowing the other end. The mouth 15b is provided with circular flanges 15c and 15d around it. In addition, the place where the air supply port 15a is formed is a place where the air diffuser 15 is attached to the flue duct 14 and directed to a place where dust is likely to accumulate in the flue duct. As for the shape, an appropriate shape can be adopted in addition to the illustrated circle and oval.
Furthermore, as shown in FIG. 4, the closed end of the air diffuser 15 can be opened, and this opening can function as an air supply port 15a and can be directed to a place where dust tends to accumulate.

Next, the recombustion furnace 2 will be described. This furnace comprises a combustion chamber 20 lined with a refractory material and a burner 21, and burns the gas supplied into the combustion chamber 20 from the air supply port 22. It is an apparatus for processing to perform deodorization and removal of harmful substances.
And between the exhaust port 14a formed in the flue duct 14 in the carbonization apparatus 1 and the air supply port 22 in the reburning furnace 2 is connected by an appropriate pipe line.

  The exhaust gas treatment mechanism in the carbonization apparatus of the present invention is configured as described above as an example, and the exhaust gas treatment method in the carbonization apparatus of the present invention will be described below together with the operation modes of these apparatuses.

(1) Feeding of raw materials First, the burner 21 of the reburning furnace 2 is ignited, the motor M is started to rotate the rotating drum 10, and the burner 17 in the carbonizing apparatus 1 is ignited, and then the rotating drum 10 and the combustion chamber 20. When the inside reaches a predetermined temperature, the object to be processed is charged into the charging device 12. In addition, as this to-be-processed object, human waste sludge, sawdust, pulp sludge, livestock dung, etc. are applied.

(2) Carbonization of the object to be processed The object to be processed is scraped up by the action of the lifter 10a provided in the rotary drum 10 and exposed to hot air supplied from the burner 17 to remove moisture, and gradually carbonized. It moves to the discharge duct 16 side while progressing, and is discharged from the discharge port 16a in a state where carbonization has finally progressed.
At this time, the amount of hot air supplied to the rotating drum 10 is suppressed in the rotating drum 10 so that the workpiece is not burned and ashed (air ratio mf = 1.0 or less). 10 is in a negative pressure state and a low oxygen concentration state.

(3) Inside the flue duct On the other hand, the hot air subjected to the carbonization treatment reaches from the inside of the rotary drum 10 to the flue 14b of the flue duct 14, and at this time, the flue duct 14 is reburned. Since the combustion air to be used for combustion in the furnace 2 is supplied from the diffuser tube 15, the temperature of the atmosphere in the flue duct 14 is kept at a low temperature of about 600 to 700 ° C. For this reason, the clinker C is not generated in the flue duct 14. Incidentally, when the air supply from the air diffuser 15 is not performed, the temperature of the atmosphere in the flue duct 14 becomes as high as 1100 to 1300 ° C., the dust melts, and the dust further adheres to the melt. The clinker C will be generated.
Further, the air supply port 15a in the air diffuser 15 is directed to a location in the flue duct 14 where dust is likely to accumulate, so that the combustion air is prevented from blowing dust and accumulating it. It is. In addition, the said dust means the fine powder etc. which are generate | occur | produced when a to-be-processed object is scraped up by the effect | action of the lifter 10a in the rotating drum 10.

(4) Treatment of exhaust gas The mixture of exhaust gas G and combustion air discharged from the exhaust port 14a is supplied to the reburning furnace 2, and the exhaust gas G is burned by the burner 21 to remove deodorized and harmful substances. After removal, the air is exhausted to the outside.

It is a side view which shows the carbonization apparatus and reburning furnace to which this invention is applied. It is the front view, side view, and top view which show a flue duct periphery. It is the front view and side view which show a diffuser tube. It is a side view which shows the diffuser tube which made the form different. It is a side view which shows the conventional carbonization apparatus and a reburning furnace.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carbonization apparatus 1A Carbonization furnace 10 Rotating drum 10a Lifter 10A Cover body 10B Cover body 11 Chain 12 Input apparatus 13 Input port 14 Flue duct 14a Exhaust port 14b Flue 15 Air diffuser 15a Air supply port 15b Inlet port 15c Flange 15d Flange 16d Exhaust duct 16a Exhaust port 16b Hot air inlet 16c Air supply port 17 Burner 18 Blower B Base F Machine frame M Motor R Support roller 2 Reburning furnace 20 Combustion chamber 21 Burner 22 Air supply port D1 Damper D2 Damper P1 Combustion air pipe P2 Combustion air line C Clinker G Exhaust gas

Claims (3)

An object to be treated is put into a rotating drum in a carbonization apparatus, and hot air is supplied into the rotating drum to carbonize the object to be treated, and exhaust gas discharged from the rotating drum is guided to a reburning furnace to be burned. Thereafter, in the operation of the carbonizing apparatus that discharges to the outside, a flue duct having a flue inside is connected to the lid that closes the end of the rotating drum, and the exhaust formed in the flue duct features and mouth, between the air inlet in the relapse furnace is intended to be connected by a suitable conduit, the combustion air supplied for combustion in the relapse furnace, to supply to the flue duct An exhaust gas treatment method in a carbonization apparatus. The object to be treated is put into the rotating drum, and hot air is further supplied into the rotating drum to carbonize the object to be treated. In the carbonization apparatus, the flume duct having a flue inside is connected to the lid that closes the end of the rotating drum, the exhaust port formed in the flue duct, and the reburning furnace between the air inlet is intended to be connected by a suitable conduit in a characterized in that the combustion air supplied for combustion in the relapse furnace was configured to supply to the flue duct An exhaust gas treatment mechanism in a carbonizing apparatus.   The exhaust gas treatment mechanism in a carbonization apparatus according to claim 2, wherein an air supply port for combustion air formed in an air diffuser is exposed in the flue duct.

Images