JP2012026598A - Waste material and subsidiary material charging apparatus of waste melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste material and subsidiary material charging apparatus having a simplified structure by integrating a waste material charging apparatus and a subsidiary material charging apparatus of a waste melting furnace and that is capable of preventing blocking caused by adhesion of dust.SOLUTION: The waste material and subsidiary material charging apparatus provided at a furnace top part includes an intermediate hopper 2 for storing waste and subsidiary materials to be charged into the furnace. An upper seal valve 6 that opens and closes during reception of the waste material is provided at an upper end of the intermediate hopper 2. A lower seal valve 7 that opens and closes during insertion of the waste and subsidiary materials into the waste melting furnace is provided at a lower end of the intermediate hopper 2. The intermediate hopper 2 includes a subsidiary material chute 21 communicated therewith so that the subsidiary material can be introduced into the intermediate hopper 2, an upper seal valve 23 provided at an upper end of the subsidiary material chute 21, and an inactive gas blowing pipe 25 connected to the intermediate hopper 2 for introducing inactive gas into the intermediate hopper to replace gas in the intermediate hopper.

Description

  The present invention relates to a waste and secondary material charging apparatus for charging waste and secondary materials into a waste melting furnace for melting waste.

  At the top of the waste melting furnace for melting waste such as general waste and industrial waste, waste charging equipment for charging waste and auxiliary materials for charging auxiliary materials such as coke and limestone A charging device is provided.

  When charging waste into the waste melting furnace, in order to prevent the in-furnace gas generated in the waste melting furnace and containing harmful components to the human body from leaking out of the furnace, This waste charging device is provided with an upper seal valve that opens and closes at the upper end of the intermediate hopper, and a lower seal valve that opens and closes when the stored waste enters the waste melting furnace at the lower end. In addition, an in-furnace gas that has entered the intermediate hopper is discharged into the furnace by an inert gas purge (see Patent Document 1).

  Even in the auxiliary material charging device for charging auxiliary materials such as coke and limestone, the furnace gas that has entered the auxiliary material storage hopper is discharged into the furnace by inert gas purging as with the waste charging device. .

  In FIG. 2, the waste charging apparatus A disposed in the upper part of the waste melting furnace 1 is provided with a receiving hopper 3 that receives the waste 29 conveyed by the waste crane 5 from the waste pit 4. An intermediate hopper 2 for temporarily storing waste 29 to be introduced into the melting furnace 1 is connected to the lower portion of the receiving hopper 3.

  Further, an auxiliary material charging device B is provided at the upper part of the waste melting furnace 1 independently of the waste charging device A.

  The waste melting furnace 1 is connected to the combustion chamber 8 by an exhaust gas pipe 9 in order to introduce combustible gas and combustible dust generated in the furnace into the combustion chamber 8.

  Combustion air from the combustion burner 10 in the combustion chamber 8 is sucked from the waste pit 4 to prevent odor in the waste pit 4. For example, the air is supplied as combustion air by a combustion air blowing duct 11 and a combustion air fan 12 provided for sucking air in the waste pit 4. The combustion air blowing duct 11 is provided with a throttle damper 13 (FIG. 3) for adjusting the negative pressure.

  In FIG. 3, the intermediate hopper 2 includes an upper seal valve 6 and a lower seal valve 7. The upper seal valve 6 partitions the receiving hopper 3 and the lower seal valve 7 partitions the inside of the furnace. The waste conveyed from the waste pit 4 by the waste crane 5 opens the upper seal valve 6, temporarily stores in the intermediate hopper 2 via the receiving hopper 3, and then closes the upper seal valve 6. . Thereafter, the lower seal valve 7 is opened and charged into the furnace.

  An inert gas blowing pipe 14 is connected to the intermediate hopper 2, and air introduced to replace the furnace gas that has entered the intermediate hopper 2 is discharged to the combustion air blowing duct 11 when charging the waste. An air exhaust pipe 15 is connected. The inlet of the air exhaust pipe 15 of the intermediate hopper 2 is covered with a cover 18 to prevent the inflow of waste. The inert gas blowing pipe 14 is provided with an inert gas blowing valve 16, and the air exhaust pipe 15 is provided with an air exhaust valve 17.

  Further, the intermediate hopper 2 is connected to an air exhaust pipe 20 for introducing the air brought in with the dust into the combustion air blowing duct 11. The inert gas blowing pipe 14 is provided with an inert gas blowing valve 19, and the air exhaust pipe 20 is provided with an air exhaust valve 20 a.

  In the auxiliary material charging device B arranged at the upper part of the furnace independently of the waste charging device A, the auxiliary material receiving hopper 31 for receiving the auxiliary material 30 sent from the auxiliary material conveyor 28 is provided under the auxiliary material receiving hopper 31. A secondary material storage hopper 22 for storing the material is continuously provided, and a secondary material chute 21 is continuously provided at a lower portion of the secondary material storage hopper 22. The auxiliary material chute 21 is connected to the upper part of the furnace and communicates with the inside of the furnace.

  The auxiliary material storage hopper 22 of the auxiliary material charging device B includes an upper seal valve 23 and a lower seal valve 24 as in the intermediate hopper 2 of the waste charging device A, and the auxiliary material receiving hopper 31 is formed by the upper seal valve 23. And is separated from the inside of the furnace by a lower seal valve 24.

  The auxiliary material storage hopper 22 is connected with an inert gas blowing pipe 25 provided with an inert gas blowing valve 25a and an inert gas blowing pipe 26 provided with an inert gas blowing valve 26a, respectively. An air exhaust pipe 27 having an air exhaust valve 27a for introducing the substituted air into the combustion air blowing duct 11 is connected.

  With reference to FIG. 3, the procedure for charging the waste and charging the auxiliary material will be described.

1. (1) Preparation for receiving waste into the intermediate hopper Before receiving the waste into the intermediate hopper 2, the inert gas purge valve 16 is opened as a purge of the intermediate hopper 2 to introduce inert gas, and the finely opened state 7a The gas is discharged from the lower seal valve 7 into the furnace.
Further, the lower seal valve 7 is fully closed, the upper seal valve 6 is half-opened, and the air exhaust valve 17 of the air exhaust pipe 15 is in a state where the combustible gas concentration in the intermediate hopper is equal to or lower than the combustible region in the air. Is opened, air is introduced from the upper seal valve 6 side, a flow path is formed to guide to the combustion air blowing duct 11 side, the inside of the intermediate hopper 2 is replaced with air, and after normal operation, Preparation is complete.

(2) Receipt of garbage into the intermediate hopper To accept garbage, the upper seal valve 6 is opened to accept garbage into the intermediate hopper 2, and the upper seal valve is closed.

(3) Replacement of the air that has entered along with the reception After the upper seal valve is closed, the inert gas blowing valve 14 of the inert gas blowing pipe 14 is used to replace the air (oxygen) brought in with the dust with the inert gas. 19 is opened, an inert gas is blown into the intermediate hopper 2, the air in the intermediate hopper is exhausted from the air exhaust pipe 20 by opening the air exhaust valve 20 a, and discharged to the combustion air blowing duct 11.

(4) Putting the waste into the furnace After the replacement is completed, the lower seal valve 7 is opened and the waste 29 is charged into the melting furnace 1.

(5) Substitution of furnace gas After completion of entering the furnace interior, the process returns to (1) in order to replace the furnace gas that has entered the intermediate hopper 2 at the time of charging with the inert gas. Thereafter, (1) to (5) are repeated to perform charging of the auxiliary material and purging of air and furnace gas.

2. Loading of secondary material (1) Preparation for receiving secondary material into secondary material storage hopper Before receiving secondary material into secondary material storage hopper 22, pipe 26 for injecting inert gas as a purge of gas in secondary material storage hopper 22 Is opened, the inert gas is introduced, the lower seal valve 24 is slightly opened and discharged into the furnace, the inside of the auxiliary material hopper 22 is replaced with the inert gas, and the preparation for the next waste charging is completed. .

(2) Acceptance of subsidiary material to subsidiary material storage hopper The subsidiary material sent from the subsidiary material conveyor 28 is received from the subsidiary material receiving hopper 31 to the subsidiary material storage hopper 22 by opening the upper seal valve 23, and then the upper seal. The valve 23 is closed and stored.

(3) Replacement of air that has entered during reception The air brought in during the storage process is introduced with inert gas from the inert gas blowing pipe 25 and is discharged from the air exhaust valve 27 to the combustion air blowing duct.

(4) Inputting the secondary material into the furnace After the replacement is completed, the lower seal valve 24 is opened, and the secondary material 30 is charged into the melting furnace 1 from the secondary material chute 21 that leads directly into the furnace.

(5) Replacement of Furnace Gas After the completion of loading of the auxiliary material into the furnace interior, the process returns to (1) in order to replace the in-furnace gas that has entered the auxiliary material storage hopper 22 at the time of charging with the inert gas. Thereafter, (1) to (5) are repeated to perform charging of the auxiliary material and purging of air and furnace gas.

JP 2007-225196 A

  In the waste charging device described in Patent Document 1, since dust concentration and humidity in the intermediate hopper are high, dust is generated at the exhaust portion (the cover 18 and the air exhaust pipe 20 in FIG. 3) from the intermediate hopper. There is a problem that the adhering and clogging is caused, the inert gas replacement of the intermediate hopper becomes defective, and the operation is stopped.

  In addition, since a purge system before the introduction of the intermediate hopper of the waste and a purge system after the introduction are required independently, the structure is complicated.

  Further, since the auxiliary material charging device is a purge system similar to the waste charging device, the structure is complicated as with the above-described waste charging device.

  Therefore, the present invention has a structure in which the waste charging device and the auxiliary material charging device of the waste melting furnace are integrated to simplify the device and prevent clogging due to dust adhesion. A waste melting furnace waste and secondary material charging device is provided.

  The present invention relates to a waste and auxiliary material charging apparatus provided with an intermediate hopper for storing waste and auxiliary materials to be charged in the furnace, provided at the top of the waste melting furnace. In addition, an upper seal valve that opens and closes when receiving waste is provided, and a lower seal valve that opens and closes when the waste and waste and auxiliary materials are charged into the waste melting furnace at the lower end of the intermediate hopper. The intermediate hopper communicates with a secondary material chute so that the secondary material can be introduced into the intermediate hopper, and an upper seal valve is provided at the upper end of the secondary material chute. Further, the intermediate hopper has a gas in the intermediate hopper. An inert gas blowing pipe for introducing an inert gas for replacing the gas into the intermediate hopper is connected.

  One end of the air exhaust pipe is connected to the secondary material chute, and the other end of the air exhaust pipe is connected to a combustion air blowing duct connected to the combustion chamber. An inert gas blowing pipe for introducing an inert gas to the intermediate hopper side from the valve is connected.

  The present invention adopts a method in which the auxiliary material is introduced into the intermediate hopper by the auxiliary material chute from the direct charging method in the furnace, so that the valve for supplying the auxiliary material of the auxiliary material charging device may be only the upper seal valve. The lower seal valve is unnecessary. Further, since the gas replacement on the intermediate hopper and the auxiliary material chute side can be performed at the same time, the purge line is simplified and the valves of the purge line are greatly reduced.

  In addition, since the exhaust part of the inert gas is also used as a secondary material chute, the adhesion dust growth of the conventional exhaust part is washed down every time the secondary material is charged by sliding down to the secondary material chute. The blockage can be resolved.

The example of installation of the auxiliary material chute having the purge air supply / exhaust pipe function of the present invention is shown. It is the whole system diagram which shows the purge method and the auxiliary material injection | throwing-in method of the conventional inert gas. It is an example of the melting furnace charging part which shows the purge method and auxiliary material injection method of FIG.

  In FIG. 1, also in the present embodiment, as in the conventional example shown in FIG. 2, the waste charging device A disposed at the upper part of the waste melting furnace 1 is connected to the waste pit by a waste crane. A receiving hopper 3 for receiving the transported waste is provided, and an intermediate hopper 2 for temporarily storing the waste to be charged into the furnace is provided below the receiving hopper 3.

  The intermediate hopper 2 is provided with an upper seal valve 6 that opens and closes at the upper end when receiving waste, and a lower seal valve 7 that opens and closes when stored waste enters the waste melting furnace at the lower end. The upper seal valve 6 partitions the receiving hopper 3 and the lower seal valve 7 partitions the interior of the furnace.

  The intermediate hopper 2 is connected to an inert gas introduction pipe 14 that introduces an inert gas that replaces the air that has entered along with the reception of dust and auxiliary materials into the intermediate hopper 2, and is connected to the inert gas introduction pipe 14. An inert gas blowing valve 19 is provided.

  A secondary material chute 21 of the secondary material charging device B is connected to and communicates with the intermediate hopper 2 in order to introduce the secondary material into the intermediate hopper 2. An upper seal valve 23 that is openable and closable for partitioning the upper portion of the auxiliary material chute 21 is provided at the upper portion of the auxiliary material chute 21.

  An air exhaust pipe 20 connected to the combustion air blowing duct 11 is connected to the auxiliary material chute 21 on the intermediate hopper 2 side from the upper seal valve 23. The air exhaust pipe 20 is provided with an air exhaust valve 20a.

  Further, an inert gas blowing pipe 14 is connected to the auxiliary material chute 21, and an inert gas blowing valve 16 is provided in the inert gas blowing pipe 14.

  Furthermore, an inert gas is introduced from the inert gas blowing valve 16 as a purge of the gas in the furnace of the intermediate hopper 2 before receiving the waste into the intermediate hopper 2, and flows into the intermediate hopper 2 via the auxiliary material chute 21, The gas is discharged from the lower seal valve 7 in the slightly opened state 7a into the furnace. At this time, the upper seal valve 23, the upper seal valve 6 and the air exhaust valve 20a are fully closed. After the combustible gas in the intermediate hopper becomes a certain concentration or less, the upper seal valve 6 is opened halfway, the air exhaust valve 20 is opened, and a flow path leading to the combustion air blowing duct 11 adjusted to the atmospheric pressure or less is provided. Form and perform air displacement. At this time, the lower seal valve 7 and the upper seal valve 6 are fully closed. After air replacement, preparation for receiving the next garbage is completed.

  The waste is received by opening the upper seal valve 6, and receiving the secondary material by opening the upper seal valve 23.

  It is necessary to replace the air that has entered along with the receipt of the dust and the auxiliary material with an inert gas before opening the lower seal valve 7 and putting the dust and the auxiliary material into the furnace. The blow valve 19 is opened, and the exhaust is discharged from the air exhaust pipe 20 to the combustion air blow duct 11 via the auxiliary material chute 21. Thereby, the gas replacement on the intermediate hopper 2 and the auxiliary material chute 21 side can be performed at the same time, and the process and the number of valves necessary for purging are greatly simplified.

  At the same time, since the exhaust part of the inert gas is also used as the secondary material chute 21, the conventional growth and adhesion of wet dust on the exhaust part is cleaned by the sliding action of the secondary material onto the chute, and clogging blockage can be eliminated.

  The charging of garbage and auxiliary materials will be described with reference to FIG.

(1) Preparation of receiving waste and secondary materials into the intermediate hopper As the purge of the intermediate hopper 2 before receiving the waste and secondary materials into the intermediate hopper 2, the upper seal valve 6 of the intermediate hopper 2 and the upper seal valve of the secondary material chute 21 In the state in which 23 is closed, the inert gas is introduced from the inert gas blowing valve 16, flows into the intermediate hopper 2 through the auxiliary material chute 21, and is discharged into the furnace by the slightly opened state 7 a of the lower seal valve 7. Is done.
After the combustible gas in the intermediate hopper has become below a certain concentration, the inert gas blowing valve 16 and the lower seal valve 7 are closed, the upper seal valve 6 is opened halfway, and the air exhaust valve 20a of the air pipe 20 is opened. Thus, a flow path leading to the combustion air blowing pipe 11 adjusted to the atmospheric pressure or less by the throttle damper 13 is formed, and air replacement is performed. In this way, preparations for receiving waste and secondary materials are completed.

(2) Receiving garbage and secondary materials into the intermediate hopper Receiving waste is performed by opening the upper seal valve 6 and receiving secondary materials by opening the upper seal valve 23.

(3) Replacement of the air that has entered during reception The air that has entered during the reception of waste and secondary materials is inert before the lower seal valve 7 is opened and the waste and secondary materials are put into the furnace. It is necessary to replace with. This opens the inert gas blowing valve 19, and the exhaust is discharged to the combustion air blowing pipe 11 through the secondary material chute 21 by opening the air exhaust valve 20 a of the air exhaust pipe 20. Thereby, the gas replacement on the intermediate hopper 2 and the auxiliary material chute side can be performed simultaneously.

(4) Entering the waste and auxiliary materials into the furnace interior Open the lower seal valve 7 and put the waste and auxiliary materials into the furnace.

(5) Replacement of furnace gas After the interior of the furnace and interior of garbage and auxiliary materials is completed, the furnace gas that has entered the intermediate hopper 2 at the time of charging is replaced with an inert gas to prepare for reception. Return to). Garbage and auxiliary materials are charged by repeating the above steps (1) to (5).

1: Waste melting furnace 2: Intermediate hopper 3: Receiving hopper 4: Waste pit 5: Waste crane 6: Upper seal valve 7: Lower seal valve 8: Combustion chamber 7a: Lower seal valve slightly open position 9: Exhaust gas tube
10: Combustion burner 11: Combustion air blowing duct 12: Combustion air fan 13: Throttle damper
14: Inert gas blowing pipe 15: Air exhaust pipe
16: Inert gas injection valve 17: Air exhaust valve
18: Cover 19: Valve for inert gas injection 20: Air exhaust pipe 20a: Air exhaust valve 21: Secondary material chute 22: Secondary material storage hopper 23: Upper seal valve 24: Lower seal valve 25: Pipe for inert gas injection 25a: Inert gas blowing valve 26: Pipe for inert gas blowing 26a: Inert gas blowing valve 27: Air exhaust pipe 27a: Air exhaust valve 28: Secondary material transfer conveyor 29: Garbage
30: Sub-material 31: Sub-material receiving hopper A: Waste charging device B: Sub-material charging device

Claims (3)

In the waste and secondary material charging device provided with an intermediate hopper for storing waste and secondary materials charged in the furnace, provided at the top of the waste melting furnace,
An upper seal valve that opens and closes when the waste is received is provided at the upper end of the intermediate hopper, and a lower portion that opens and closes at the lower end of the intermediate hopper when the waste and waste and auxiliary materials are charged into the waste melting furnace. A seal valve is provided,
The intermediate hopper communicates with an auxiliary material chute so that the auxiliary material can be introduced into the intermediate hopper, and an upper seal valve is provided at the upper end of the auxiliary material chute.
Furthermore, the waste and auxiliary material charging device, wherein an inert gas blowing pipe for introducing an inert gas for replacing the gas in the intermediate hopper into the intermediate hopper is connected to the intermediate hopper.   The disposal according to claim 1, wherein one end of the air exhaust pipe is connected to the auxiliary material chute and the other end of the air exhaust pipe is connected to a combustion air blowing duct connected to the combustion chamber. Material and auxiliary material charging equipment.   The waste material and the auxiliary material according to claim 1 or 2, wherein the auxiliary material chute is connected to an inert gas blowing pipe for introducing an inert gas from the upper seal valve to the intermediate hopper side. Charging device.

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