JPS6246763B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid material combustion method for burning solid materials such as coal, wood chips, pitch, and plastic in a combustion furnace, such as a stoker-fired combustion furnace.

A conventional combustion method will be explained based on the embodiment shown in FIG.

The combustion furnace 01 is equipped with a fuel supply device 02 that supplies lumpy solids and powdered solids into the combustion furnace 01, and a duct 03 provided at the exhaust gas outlet of the combustion furnace 01 has a duct 03 for capturing unburned solids. A collection device 04 is provided. A transportation means 05 that guides the unburned solids into the combustion furnace 01 is connected to the unburned solids outlet of the unburned solids collection device 04 . In addition, the combustion furnace 01 is
It communicates with a blower 06 for supplying combustion air to the combustion furnace 01.

A lumpy solid is supplied into a combustion furnace 01 from a fuel supply device 02, and the solid is combusted by air supplied through a blower 06. The ash and unburned solids contained in the exhaust gas flowing through the duct 03 are separated by the unburnt solids collector 04, and the ash is discharged outside the furnace.
The unburned solids are transferred again to the combustion furnace 0 via the transportation means 05.
1 and re-burned.

In the conventional method, even if the recovered unburned solids were returned to the combustion furnace 01, they were not completely burned and were carried out of the system as unburned substances, requiring time and effort for disposal. Furthermore, the lumpy solids supplied from the fuel supply device 02 into the combustion furnace 01 also contain a large amount of powdery solids, and due to the mixture of lumpy solids and powdery solids, only the lumpy solids are contained. There was an example in which the power of the blower 06 was increased to make combustion more difficult. Therefore, it is also practiced to separate the powdery solids in a pretreatment stage and then use only the lumpy solids as fuel. In addition, since the fuel needs to be circulated between the unburned solids collector 04 and the combustion furnace 01 many times before it is burned out, the capacity of the unburned solids collector 04 may be increased or the circulation system Measures were taken to prevent clogging and wear.

SUMMARY OF THE INVENTION Therefore, the present invention has been made for the purpose of providing a method for burning solid substances efficiently and stably to burn solid fuel and unburned matter discharged from a combustion furnace. , a solid matter combustion method in which solid matter is supplied into a combustion furnace and combusted, and unburned solid matter in exhaust gas discharged outside the furnace is recovered and then supplied into the combustion furnace and re-burned; Separating the solids into lumpy solids and powdery solids, supplying the lumpy solids into the combustion furnace and burning them, and collecting the unburned solids and mixing them with the powdery solids. The solid matter combustion method is characterized in that the solid matter is pelletized and then fed into the combustion furnace to be burned together with the agglomerated solid matter.

According to the method provided by the present invention, unburned solids and powdered solids in the exhaust gas are pelletized and burned in the combustion furnace, so that the unburned solids are not discharged outside the furnace unburned. As a result, combustion efficiency is high, combustion is stabilized due to the reduction of powdery solids, there is no need to increase the capacity of equipment, even if powdery solids are mixed in the fuel, it can be combusted efficiently, and the fuel is completely combusted. This eliminates the need for multiple circulations within the system, reduces clogging and abrasion problems within the system, and only ash is discharged as waste, simplifying disposal. Even if it contains, it can be used as a fuel and has the advantage of being able to use various fuels.

Furthermore, the present invention provides solid combustion in which solids are supplied into a combustion furnace and combusted, and unburned solids in exhaust gas discharged outside the furnace are recovered and then supplied into the combustion furnace and re-burned. In the method, the solids are separated into lumpy solids and powdery solids, the lumpy solids are fed into the combustion furnace and burned, and after recovering the unburned solids, the powdery Provided is a solid matter combustion method, characterized in that the pellets are mixed with solid matter and pelletized, and then the pellets are dried in the combustion furnace or with the heat of exhaust gas, and the pellets are fed into the combustion furnace and burned together with the lumpy solid matter. According to the method of the present invention, waste heat is further used to dry the pellets, so that pellets with sufficient strength can be obtained, and problems in the circulation system can be further reduced.

Next, the present invention will be specifically explained based on a first embodiment shown in FIG.

The combustion furnace 1 is provided with a fuel supply device 2 that supplies lumpy solids into the combustion furnace 1, and an unburned solids collection device 4 is installed in the middle of a duct 3 connected to the exhaust gas outlet of the combustion furnace 1. It is provided. A transport means 5 for guiding the unburned solids into the pellet manufacturing apparatus 7 is provided at the unburned solids discharge port of the unburned solids collection device 4. The classifier 8 that separates the solids into lumpy solids and powdered solids is provided with a transportation means 9 that guides the lumpy solids from the lumpy solids outlet to the fuel supply device 2. A transport means 10 is provided for guiding the powdery solids to the pelletizing production device 7. The pelletizing production apparatus 7 is provided with a transport means 11 for guiding the pellets into the combustion furnace 1.
Further, the combustion furnace 1 is in communication with a blower 6 for supplying combustion air into the combustion furnace 1. Incidentally, the pelletizing production device 7 is for pelletizing the powdered material with appropriate moisture.

The lumpy solids in the solid fuel are separated from powder solids by a classifier 8 and sent to a fuel supply device 2 via a transportation means 9, and then supplied to a combustion furnace 1 by the fuel supply device 2. On the other hand, the powdered solid material is sent to the pelletizing production device 7 via the transportation means 10. Unburned solids in the exhaust gas from the combustion furnace 1 are collected by an unburnt solids collector 4 and sent to a pellet manufacturing device 7 by a transportation means 5.

In the pellet manufacturing device 7, unburnt solids and powder solids are mixed with appropriate moisture and pelletized. The pellets are sent to the combustion furnace 1 by means of transportation 11, and are pelletized in the combustion furnace. Burn.
The unburned solids in the exhaust gas and the powdered solids separated from the fuel are made into pellets using only an appropriate amount of moisture without using a special binder and are burned in the combustion furnace 1, so pelletizing requires high costs. Since the unburned solids are not discharged unburned outside the combustion furnace 1, the combustion exchange rate is good, the combustion is stabilized as the powdery solids are reduced, and there is no need to increase the capacity of equipment, and there is no need to increase the capacity of the equipment. Even if powdery solids are mixed in, it can be efficiently combusted, and the fuel is completely combusted, eliminating the need for multiple circulations in the system, reducing clogging and abrasion problems in the system, and leaving only ash as waste. This makes disposal easier than before, and even if the fuel contains a large amount of powdery solids, it can be used as fuel, making it possible to use a variety of fuels.

Next, the present invention will be explained based on a second embodiment shown in FIG.

The apparatus of the present embodiment is configured such that one part of the exhaust gas flowing through the duct 3 is supplied to the pelletizing production apparatus 7 of the apparatus of the first embodiment.
The apparatus is equipped with a pellet drying apparatus 12 for drying the pellets using the heat of exhaust gas.

The lumpy solids in the solid fuel are separated from powdery solids by a classifier 8, and are supplied to the combustion furnace 1 by a fuel supply device 2. On the other hand, the powdered solids are sent to the pellet manufacturing device 7. Unburnt solids contained in combustion exhaust gas are
The solids are separated by the unburned solids collector 4 and sent to the pellet manufacturing device 7. Since a large amount of combustion ash is mixed into the unburned solids sent to the pellet manufacturing device 7, it can be easily pelletized as long as there is an appropriate amount of moisture without mixing a special binder. These pellets are dried in a pellet drying device 1 that uses residual heat from exhaust gas.
2, it is solidified to sufficient strength and sent as pellet fuel to the combustion furnace 1, where it is burned.

Therefore, according to this example, it is possible to reduce unburned losses and save labor in waste treatment, stabilize combustion due to the reduction of powdery solids, and use the residual heat of exhaust gas, making it possible to The device can produce pellets with sufficient strength, reducing problems with the circulation system.

Next, the present invention will be explained based on a third embodiment shown in FIG.

In this example, the pellet drying device 12 in the second embodiment shown in FIG. 3 is placed inside the combustion furnace 1,
The pelletizing production device 7 and the pellet drying device 12 are connected by a transportation means 11, and the pellets sent from the pelletizing production device 7 are dried in the pellet drying device 12 using the heat in the combustion furnace 1. The dried pellets are fed to the combustion bed at the bottom of the furnace, such as a stoker.

The effects of this example are almost the same as those of the second embodiment, so the explanation thereof will be omitted here.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of an apparatus for carrying out a conventional solid matter combustion method, and FIGS. 2 to 4 are flowcharts of first to third embodiments of the present invention, respectively. 01,1... Combustion furnace, 02,2... Fuel supply device, 04,4... Unburnt solids collection device, 06,6
...Blower, 7...Pelletization manufacturing equipment, 8...
Classifier, 12... pellet drying device.

Claims (1)

[Scope of Claims] 1. Solids are supplied into a combustion furnace and burned, and after recovering unburned solids from exhaust gas discharged outside the furnace, solids are supplied into the combustion furnace and re-burned. In the solid matter combustion method, the solid matter is separated into lumpy solid matter and powdery solid matter, and the lumpy solid matter is fed into the combustion furnace and burned, and the unburned solid matter is recovered, and then the powdery solid matter is collected. A solid matter combustion method, which comprises mixing the pellets with solid matter, supplying the pellets to the combustion furnace, and burning the pellets together with the lumpy solid matter. 2. A solid matter combustion method in which solid matter is supplied into a combustion furnace and combusted, and unburned solid matter in exhaust gas discharged outside the furnace is recovered and then supplied into the combustion furnace and re-burned. Separating the solids into lumpy solids and powdery solids, feeding the lumpy solids into the combustion furnace and burning them, and collecting the unburned solids and mixing them with the powdery solids. A solid matter combustion method comprising: pelletizing the pellets, then drying the pellets in the combustion furnace or using the heat of exhaust gas, and supplying the pellets to the combustion furnace where they are combusted together with the lumpy solids.