JP2009191085A - Method and system for manufacturing solid fuel, and solid fuel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a system for manufacturing a solid fuel, capable of improving pulverizing property while keeping calories usable as a fuel by carbonizing a hard biomass under appropriate conditions, and manufacturing a solid fuel having a similar level of pulverizing property as coal, and to provide a solid fuel. <P>SOLUTION: The system for manufacturing the solid fuel includes a carbonization furnace 1 that heats biomass in an oxygen-deficiency atmosphere and manufactures a solid fuel 21 to be pulverized as mixed with coal or in a single material, and used a fine powder fuel, wherein the carbonization furnace 1 is set to furnace conditions of 1 to 5% oxygen concentration and 350 to 400°C treatment temperature and is configured to manufacture the solid fuel 21 by heating hard biomass 20 such as vegetable chaffs, fruits and seeds under the above conditions for 30 to 90 minutes to carbonize. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a solid fuel production method and system for producing a solid fuel by heating hard biomass containing plant shells, berries and seeds in an oxygen-deficient atmosphere, and in particular, the solid fuel is pulverized. In particular, the present invention relates to a solid fuel manufacturing method and system, and a solid fuel, which can improve grindability by carbonizing hard biomass under appropriate conditions.

In recent years, as a measure against global warming due to depletion of fossil fuels and CO ₂ emissions, use of fuel using biomass has been promoted. In general, biomass refers to an organism that can be used as an energy source or an industrial raw material, and various methods for effectively using this biomass have been proposed. Among them, as a useful method capable of converting biomass into a high value-added product at a low cost, there is a method for producing a solid fuel by carbonizing biomass. In this method, biomass is put into a carbonization furnace and heated for a predetermined time in an oxygen-deficient atmosphere to be carbonized to produce a solid fuel.

  The solid fuel thus produced is used as a fuel source for combustion facilities such as power generation facilities and incineration facilities. In this case, the solid fuel must be finely pulverized and used as a finely divided fuel in order to improve combustion efficiency. There is. Solid fuel is pulverized by itself or mixed with coal. For example, in Patent Document 1 (Japanese Patent Laid-Open No. 2004-347241), coal and solid fuel are supplied to a pulverization mill and pulverized to obtain a finely mixed fuel. A pulverizing apparatus for manufacturing is disclosed.

However, most woody biomass of biomass is fibrous, so that the grindability is poor, and there are problems such as a decrease in combustion efficiency and a decrease in operability of the grinder.
Therefore, Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-26474) discloses a method in which woody biomass is pyrolyzed at a temperature of 240 ° C. to 300 ° C. for 15 minutes to 90 minutes and then pulverized. . This is intended for woody biomass such as sawn timber, thinned wood, garden trees, building waste, etc. If the heating temperature is lower than 240 ° C, the crushability and grindability will not improve, and the temperature will be higher than 300 ° C. In this case, the amount of fine powder on the order of submicron is increased at the time of crushing and pulverization, and powder trouble is likely to occur.

Similarly, examples of biomass with poor grindability include hard biomass such as plant shells, fruits and seeds. Plant shells, fruits, seeds, etc. are actually discarded in large quantities from the plantation, and it is desired to make effective use of them, but such hard biomass is not an embrittlement material and the above Since the pulverization is worse than woody biomass and it is difficult to pulverize by compression and shearing, the upper limit of the biomass co-firing rate is extremely low at several percent when co-firing with a coal-fired boiler. Therefore, it was not used effectively.
On the other hand, carbonization is effective for embrittlement of organic substances, but as a result of gasification of volatiles in biomass by thermal decomposition, the amount of heat remaining in the carbide is reduced to 50% or less, reducing the value as fuel. End up.

JP 2004-347241 A JP 2006-26474 A

As described above, hard biomass is extremely pulverizable and difficult to pulverize by compression and shearing. Therefore, as described in Patent Document 1, it is pulverized by mixing with coal and pulverized as a pulverized mixed fuel. When used for the above, the mixing ratio of hard biomass had to be lowered.
As described in Patent Document 2, even if hard biomass is carbonized under the same level of conditions as woody biomass, hard biomass has different properties from woody biomass, and its grindability is worse. If it is not sufficiently improved and pulverized by mixing with coal, the pulverizer's fineness and operational performance such as operational stability will decrease, the operating energy consumption will increase, and the coal and biomass will be mixed uniformly. If this is not done, problems such as a reduction in combustion efficiency as a fuel remain.

On the other hand, if the thermal decomposition is further promoted in order to promote embrittlement, there is a problem that the amount of heat remaining in the carbide (solid fuel) decreases and the value as a fuel is reduced.
Therefore, in view of the above-mentioned problems of the prior art, the present invention carbonizes hard biomass under appropriate conditions to improve the pulverization property while maintaining the amount of heat that can be used as fuel, and to achieve the same level of pulverization properties as coal. An object of the present invention is to provide a solid fuel production method and system capable of producing a solid fuel, and a solid fuel.

Therefore, in order to solve the above problems, the present invention provides a solid fuel production method for producing a solid fuel mixed with coal or pulverized alone and used as a pulverized fuel by heating biomass in an oxygen-deficient atmosphere. ,
The solid fuel is produced by carbonizing a hard biomass containing plant shells, berries and seeds at an oxygen concentration of 1 to 5% and a treatment temperature of 350 to 400 ° C. for 30 to 90 minutes. And

According to the present invention, when the treatment temperature in the carbonization treatment is 350 to 400 ° C., the HGI (hard glove grindability index) of the produced solid fuel is about 30 to 60. Generally, since coal has an HGI of about 40 to 50, the solid fuel has the same level of pulverization as coal. As a result, the crushability of the solid fuel is greatly improved, and the crushing performance of the crusher can be improved and the power can be reduced. HGI is an abbreviation for Hardgrove Grinding Index, which is an index for evaluating the grindability of coal. The amount of crushed material obtained by adding a certain amount of work to the material to be ground. The larger the value, the higher the grindability.
Even when solid fuel is mixed with coal and pulverized, the solid fuel can be uniformly pulverized together with coal, so that combustion efficiency is high and high-quality fuel can be obtained.
In addition, by heating within the range of the processing temperature of 400 ° C. or less, the remaining amount of heat of the solid fuel becomes 50% or more with respect to the amount of heat of the hard biomass. Therefore, it is possible to ensure the same level of pulverization as that of coal while leaving the amount of heat to such an extent that the utility value as fuel does not decrease.

In addition, in a solid fuel production method for producing a solid fuel mixed with coal or pulverized alone and used as a pulverized fuel by heating biomass in an oxygen-deficient atmosphere,
By carbonizing hard biomass containing plant shells, berries and seeds at an oxygen concentration of 1 to 5% and a treatment temperature at which the HGI of the produced solid fuel is 30 to 60 for 30 to 90 minutes The solid fuel is manufactured.

According to the present invention, as in the above, the pulverization performance of the solid fuel is greatly improved, the pulverization performance of the pulverizer can be improved, and the power can be reduced. It can be uniformly pulverized, has high combustion efficiency, and can be a high quality fuel.
Moreover, since it sets to the processing temperature from which HGI becomes 30-60, processing temperature is set suitably according to the kind of hard biomass, a property, and a processing amount, and it becomes possible to improve a grindability reliably. Furthermore, even when hard biomass is mixed with other types of biomass and carbonized, the grindability of the hard biomass can be reliably improved by setting the HGI to an appropriate temperature of 30 to 60. it can.

Furthermore, the pyrolysis gas generated by the carbonization treatment of the hard biomass is burned, and the generated combustion gas is used as a heat source for the carbonization treatment.
By the carbonization treatment under the above conditions, about 70% of the heat quantity of the hard biomass remains as a solid fuel, and about 30% is gasified as a pyrolysis gas. By using this pyrolysis gas as a heat source for carbonization, it is possible to cover the amount of heat necessary for low-temperature carbonization treatment of hard biomass, and it is not necessary to supply a heat source from the outside. It becomes possible to set it as a system.

In addition, in a solid fuel production system that includes a carbonization furnace that heats biomass in an oxygen-deficient atmosphere and that is mixed with coal or pulverized alone and used as a pulverized fuel,
The carbonization furnace is set to in-furnace conditions with an oxygen concentration of 1 to 5% and a processing temperature of 350 to 400 ° C., and the hard biomass containing plant shells, fruits and seeds is heated for 30 to 90 minutes under the above conditions. And a device for producing a solid fuel by carbonization.
According to the present invention, the pulverization property of the solid fuel is greatly improved, the pulverization performance of the pulverizer can be improved and the power can be reduced, and the solid fuel is uniformly pulverized together with the coal when pulverized by mixing with the coal. The combustion efficiency is high and the fuel can be made high quality. In addition, the amount of heat required for the solid fuel can be left.

Furthermore, it comprises a combustion furnace for burning the pyrolysis gas generated in the carbonization furnace,
A combustion gas line for supplying at least a part of the combustion gas generated in the combustion furnace to the carbonization furnace as a heat source for the carbonization treatment is provided.
As a result, it is possible to cover the amount of heat necessary for subjecting the hard biomass to low-temperature carbonization, and it is not necessary to supply a heat source from the outside. Therefore, it is possible to improve the thermal efficiency and make a self-supporting system.

Furthermore, it comprises a boiler furnace that burns the pulverized fine fuel by combusting the solid fuel and generates steam.
The combustion gas line is branched, and a combustion gas line is provided for supplying other combustion gases excluding the combustion gas supplied to the carbonization furnace to the heat exchange section of the boiler furnace.
As a result, heat can be recovered from the high-temperature combustion gas generated in the combustion furnace, so that energy can be used efficiently.

Also, a system comprising a boiler furnace that pulverizes the pulverized solid fuel to burn fine powder and generates steam, and an exhaust gas treatment facility that processes exhaust gas discharged from the boiler furnace,
An exhaust gas line for supplying exhaust gas from the carbonization furnace to the exhaust gas treatment facility is provided, and both the exhaust gas from the carbonization furnace and the exhaust gas from the boiler furnace are treated.
This is because the exhaust gas treatment facility of the carbonization furnace and the exhaust gas treatment facility of the boiler furnace are shared, so that the system can be saved in space and reduced in size and the cost can be reduced.

In addition, in solid fuel that is mixed with coal or pulverized alone and used as pulverized fuel,
It is produced by heating and carbonizing hard biomass containing plant shells, berries and seeds at an oxygen concentration of 1 to 5% and a treatment temperature of 350 to 400 ° C. for 30 to 90 minutes.
In addition, in solid fuel that is mixed with coal or pulverized alone and used as pulverized fuel,
By carbonizing hard biomass containing plant shells, berries and seeds at an oxygen concentration of 1 to 5% and a treatment temperature at which the HGI of the produced solid fuel is 30 to 60 for 30 to 90 minutes It is manufactured.
According to these inventions, in solid fuel that is a raw material for pulverized fuel, even if it is hard biomass with poor pulverizability, it can be pulverized to the same level as coal by producing it by carbonizing under the above conditions. It is possible to provide a high-quality solid fuel.

As described above, according to the present invention, a solid fuel having a pulverization level equivalent to that of coal can be obtained by carbonizing hard biomass under appropriate conditions to improve the pulverization property while remaining the amount of heat available as fuel. It becomes possible to provide a method and system for producing a solid fuel that can be produced, and a solid fuel.
That is, by setting the treatment temperature in the carbonization treatment to 350 to 400 ° C., the solid fuel has the same level of pulverization as coal, and the pulverization performance of the pulverizer can be improved and the power can be reduced. Even when the solid fuel is mixed with the coal and pulverized, the solid fuel can be uniformly pulverized together with the coal, and the combustion efficiency is high and a high-quality pulverized fuel is obtained.

Moreover, it becomes possible to leave the calorie | heat amount required as solid fuel by heating within the process temperature of 400 degrees C or less.
Further, by setting the processing temperature to a temperature at which the HGI is 30 to 60, the processing temperature is appropriately set according to the type, properties, and processing amount of the hard biomass, and the pulverization property can be improved reliably. Become. Furthermore, even when hard biomass is mixed with other types of biomass and carbonized, by setting the HGI to an appropriate temperature of 30 to 60, the hard biomass can be reliably pulverized. it can.

Furthermore, by burning the pyrolysis gas generated by the carbonization process and using the generated combustion gas as a heat source for the carbonization process, it is possible to cover the amount of heat necessary for low-temperature carbonization treatment of hard biomass, and an external heat source is used. Since there is no need to supply, it is possible to improve the thermal efficiency and to make a self-supporting system.
Furthermore, by sharing the exhaust gas treatment facility of the carbonization furnace and the exhaust gas treatment facility of the boiler furnace, the system can be reduced in space and size, and the cost can be reduced.
Further, the solid fuel produced by the above-described invention has high pulverization property, and even when mixed with coal and pulverized, it is homogeneous and has high combustion efficiency, and can be a high quality fuel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.
FIG. 1 is a flowchart of a method according to an embodiment of the present invention, FIG. 2 is a graph showing the relationship between the carbide treatment temperature and HGI, FIG. 3 is a graph showing the relationship between the carbide treatment temperature and the weight / heat residual ratio, and FIG. FIG. 5 is an overall configuration diagram of a system according to Embodiment 1 of the present invention, and FIG. 5 is an overall configuration diagram of a system according to Embodiment 2 of the present invention.

In the present embodiment, a method and system for producing a solid fuel by carbonizing hard biomass and the solid fuel produced in this manner will be described. Here, the hard biomass is a hard plant biomass such as plant shells, berries, seeds, etc., and exhibits a lower pulverization value than woody biomass such as waste wood, thinned wood, and pruned branches. . Specific examples of the hard biomass include oil tree seeds, shells, and walnut shells.
Further, the solid fuel produced in the present embodiment can be pulverized and used as a fine powder fuel in a wide range of fuels in combustion facilities such as power generation facilities and incineration facilities. It is preferable to pulverize and use as a fine powder mixed fuel.

With reference to FIG. 1, the processing flow in this embodiment is demonstrated.
In the present embodiment, the hard biomass 100 is heated in a carbonization furnace at a temperature of 350 to 400 ° C. and an oxygen concentration of 1 to 5% for 30 to 90 minutes (101) to produce a solid fuel (102).
The solid fuel (102) thus produced has a HGI value of 30-60. HGI is an abbreviation for Hardgrove Grinding Index (Hardbrove Grinding Index), which is an index for evaluating the grindability of coal and is determined by the amount of crushed material obtained by adding a certain amount of work to the material to be ground. The larger the value, the higher the grindability.

FIG. 2 shows the relationship between the carbide treatment temperature and HGI. As shown in the figure, when the treatment temperature in the carbonization furnace is 350 to 400 ° C., the HGI of the carbide (solid fuel) is 30 to 60.
Generally, since coal has an HGI of about 40 to 50, the solid fuel (102) has an HGI equivalent to that of coal. As a result, when the solid fuel (102) is mixed and pulverized (104) with the coal (103) by the pulverizer, the solid fuel can be uniformly pulverized together with the coal. Reduction is possible. Furthermore, since the finely mixed fuel (105) that is uniformly pulverized and mixed can be manufactured, the combustion efficiency is high and the fuel can be made high quality. Further, the solid fuel (102) may be pulverized (106) alone, and the produced fine fuel (107) may be used as it is as a fuel for combustion equipment, or may be used as a mixture with other fine fuel. Good.

  FIG. 3 shows the relationship between the carbide treatment temperature, the raw material weight, and the residual amount of heat. As shown in the figure, the raw material weight and the remaining amount of heat decrease as the processing temperature increases. However, within the temperature range of 350 to 400 ° C., the remaining amount of heat remains at 50% or more. Therefore, as in this embodiment, by setting the processing temperature to 400 ° C. or less, the amount of heat of the carbide remains to the extent that the utility value as a fuel is not reduced, and the same level of pulverization as coal is ensured. It is possible to do.

As another processing flow, hard biomass is carbonized in a carbonization furnace by heating at a processing temperature at an oxygen concentration of 1 to 5% and an HGI of the produced solid fuel of 30 to 60 for 30 to 90 minutes. A solid fuel may be produced.
According to this, the pulverization performance of the solid fuel is greatly improved in the same manner as described above, and the pulverization performance of the pulverizer can be improved and the power can be reduced. The fuel can be pulverized to a high quality and has high combustion efficiency.
Moreover, since it sets to the processing temperature from which HGI becomes 30-60, processing temperature is set suitably according to the kind of hard biomass, a property, and a processing amount, and it becomes possible to improve a grindability reliably. Furthermore, even when hard biomass is mixed with other types of biomass and carbonized, by setting the HGI to an appropriate temperature of 30 to 60, the hard biomass can be reliably pulverized. it can.

Example 1
Next, as an example of the system of this embodiment, the configuration and operation of the system according to Example 1 will be described with reference to FIG.
The system shown in FIG. 4 is connected to a carbonization furnace 1 composed of an indirect heating kiln, a combustion furnace 2 connected to a pyrolysis gas outlet 15 of the carbonization furnace 1, and a combustion gas outlet of the combustion furnace 2. A boiler 3, a gas cooling tower 4 connected to the exhaust gas outlet of the boiler 3, a bag filter 5 connected to the exhaust gas outlet of the gas cooling tower 4, and an induction fan 6 connected to the exhaust gas outlet of the bag filter 5 And a chimney 7 connected to the discharge port of the induction fan 6.

A gas line 22 extending from the pyrolysis gas outlet 15 of the carbonization furnace 1 is connected to the combustion furnace 2, and the pyrolysis gas discharged from the carbonization furnace 1 is used as fuel for the combustion furnace 2.
A gas line extending from the combustion gas outlet of the combustion furnace 2 is branched into combustion gas lines 24 and 27, the combustion gas line 24 is connected to the boiler 3, and the combustion gas line 27 is connected to the carbonization furnace 1 to supply combustion gas. It is used as a heat source for carbonization.
A gas line extending from the exhaust gas outlet of the boiler 3 is branched into exhaust gas lines 25 and 26, the exhaust gas line 25 is connected to the gas cooling tower 4, and the exhaust gas line 26 is connected to the combustion furnace 2.
The gas line 28 extending from the combustion gas outlet of the carbonization furnace 1 is connected to the gas line 25 so that the exhaust gas of the combustion gas used for heating the carbonization furnace 1 is supplied to the gas cooling tower 4. .

The carbonization furnace 1 may be any type of carbonization furnace such as an indirect heating type rotary kiln, a direct heating type rotary kiln, a fluidized bed furnace, or a screw type carbonization furnace. In FIG. The configuration is shown. The carbonization furnace 1 includes a charging means 11 for charging the hard biomass 20 into the furnace, an inner cylinder 12 connected to the charging means 11, a charging means 11 having a solid fuel discharge port 14 provided on the other end side, and A pyrolysis gas outlet 15 and an outer cylinder 13 through which heating combustion gas flows are provided. In addition, you may make it provide a drying furnace before the carbonization furnace 1 as needed.
The combustion furnace 2 supplies a pyrolysis gas inlet through which the pyrolysis gas from the carbonization furnace 1 is supplied via a gas line 22, a combustion air inlet for supplying combustion air 23, and a return exhaust gas from the boiler 3. And an exhaust gas outlet for discharging high-temperature combustion gas generated by burning them.

The boiler 3 includes a combustion gas inlet through which the combustion gas from the combustion furnace 2 is supplied via a gas line 24, and an exhaust gas outlet through which the exhaust gas after heat exchange is discharged. Is supplied to the carbonization furnace 1 in order to prevent air from entering the furnace when the carbonization furnace 1 is started and stopped, for example.
Exhaust gas discharged through the boiler 3 is processed through an exhaust gas treatment facility comprising a gas cooling tower 4 and a bag filter 5, but the configuration of the exhaust gas treatment facility is not particularly limited, and exhaust gas components, properties and amounts The apparatus configuration is appropriately set according to the above.

In the system having the above-described configuration, the hard biomass 20 is first supplied from the charging means 11 to the carbonization furnace 1 and heated by the combustion gas flowing through the outer cylinder 13 in an oxygen-deficient atmosphere while being conveyed through the inner cylinder 12. Carbonized. At this time, the treatment temperature is 350 to 400 ° C., the oxygen concentration is 1 to 5%, and the treatment time is 30 to 90 minutes. Or you may set process temperature so that HGI of the solid fuel 21 manufactured with the carbonization furnace 1 may be set to 30-60.
The solid fuel 21 produced by the carbonization process is discharged from the solid fuel discharge port 14, while the generated pyrolysis gas is discharged from the pyrolysis gas outlet 15 and introduced into the combustion furnace 2 through the gas line 22. In the combustion furnace 2, pyrolysis gas from the carbonization furnace 1, combustion air 23, return exhaust gas from the boiler 3, and auxiliary fuel as necessary are introduced, and the pyrolysis gas is burned to generate high-temperature combustion gas. Is generated. The combustion gas is supplied to the carbonization furnace 1 through the gas line 27 by the amount of heat required for heating the carbonization furnace 1, and the remaining combustion gas is supplied to the boiler 3 through the gas line 24.

The combustion gas supplied to the carbonization furnace 1 is heated to the hard biomass 20 through the outer cylinder 13 and then fed to the gas cooling 4 or the like through the gas line 28.
In the boiler 3, steam is generated by the combustion gas supplied from the combustion furnace 2, and the generated steam is supplied to the carbonization furnace 1 as necessary. The exhaust gas discharged from the boiler 3 is cooled by the gas cooling tower 4, then dust is removed by the bag filter 5, and discharged from the chimney 7 to the outside of the system.

According to the first embodiment, the solid biomass is carbonized in the carbonization furnace 1 under the above-described conditions, thereby improving the pulverization property while remaining the amount of heat that can be used as fuel, and having a pulverization property equivalent to that of coal. Fuel can be produced.
In the first embodiment, the pyrolysis gas generated by the carbonization treatment of the hard biomass 20 in the carbonization furnace 1 is combusted in the combustion furnace 2, and the high-temperature combustion gas generated in the combustion furnace 2 is converted into the carbonization furnace. 1 is used as a heating source for carbonization.
By the carbonization under the above conditions, as shown in FIG. 3, about 70% of the heat quantity of the hard biomass remains as solid fuel, and about 30% is gasified as pyrolysis gas. By using this pyrolysis gas as a heat source for carbonization, it is possible to cover the amount of heat necessary for low-temperature carbonization treatment of hard biomass, and no heat source is supplied from the outside. It becomes possible to set it as a system.

(Example 2)
FIG. 5 shows a configuration of a system according to the second embodiment. In the second embodiment, detailed description of the same configuration as that of the first embodiment will be omitted.
In FIG. 5, the system of the second embodiment includes a carbonization furnace 1 that carbonizes hard biomass 20, and a combustion furnace 2 that generates a combustion gas supplied to the carbonization furnace 1 by burning the pyrolysis gas from the carbonization furnace 1. And a pulverized fuel-fired boiler facility using the solid fuel 21 produced in the carbonization furnace 1 and coal 29 as fuel sources.
The pulverized fuel-fired boiler facility includes a conveyor 31 that conveys coal 29, a coal bunker 32, a pulverizer 33, a boiler furnace 34, an exhaust gas treatment facility 35, and a chimney 36.
The conveyor 31 or the coal bunker 32 is provided with solid fuel supply means for supplying the solid fuel 21 produced in the carbonization furnace 1.

A pulverizer 33 is connected to the coal bunker 32, and the coal 29 and the solid fuel 21 are supplied to the pulverizer 33, which are pulverized and pulverized. The pulverized pulverized mixed fuel is jetted from a burner provided on the combustion chamber side wall of the boiler furnace 34 and burned, and steam is generated by the generated high-temperature combustion gas. The generated steam is used for power generation and the like, and is supplied to the carbonization furnace 1 as necessary. The carbonization furnace 1 is used, for example, for preventing air from entering the furnace at the time of starting and stopping.
The exhaust gas discharged from the boiler furnace 34 is discharged from the chimney 36 through the exhaust gas treatment facility 35 to the outside of the system. The exhaust gas treatment facility 35 is composed of, for example, a gas cooling tower, a bag filter, and the like, and the apparatus configuration is appropriately set according to the exhaust gas component, properties, and quantity.

Furthermore, in the present Example 2, the gas line 28 which supplies the exhaust gas of the combustion gas utilized for the heating of the carbonization furnace 1 to the exhaust gas treatment equipment 35 of a pulverized fuel burning boiler equipment is provided.
Moreover, the gas line 24 which supplies combustion gas other than supplying to the carbonization furnace 1 among the combustion gas produced | generated in the combustion furnace 2 to the exhaust gas treatment equipment 35 of a pulverized fuel burning boiler equipment is provided. At this time, since the combustion gas from the combustion furnace 2 is at a high temperature, it is preferable to supply the heat to the heat exchange section of the boiler furnace 34 for heat recovery.

According to the second embodiment, since the exhaust gas treatment facility of the carbonization facility and the exhaust gas treatment facility of the pulverized fuel-fired boiler facility are shared, the system can be saved in space and reduced in size, and the cost can be reduced. It becomes possible.
Furthermore, in the boiler furnace 34 of the pulverized fuel-fired boiler facility, heat can be recovered from the high-temperature combustion gas generated in the combustion furnace 2, so that energy can be used efficiently. That is, when used for power generation facilities, the solid calorific value of the hard biomass is recovered by burning solid fuel in the boiler furnace 34, while the gas calorific value is obtained by burning the pyrolysis gas in the combustion furnace 2. By recovering energy in the boiler furnace 34 from the high-temperature combustion gas produced afterwards, the amount of heat possessed by the hard biomass can be used for power generation.
Furthermore, by supplying a part of the steam generated in the pulverized fuel-fired boiler equipment to the carbonization furnace, the equipment for producing the necessary steam in the carbonization equipment can be simplified or not installed.

  In the present invention, a solid fuel having the same level of pulverization as coal can be produced from hard biomass. Therefore, the solid fuel is pulverized and used alone as a pulverized fuel, or mixed and pulverized by mixing solid fuel and coal. The present invention can be widely applied to combustion facilities such as power generation facilities equipped with a pulverized fuel-fired boiler furnace used as a mixed fuel.

3 is a flowchart of a method according to an embodiment of the present invention. It is a graph which shows the relationship between the processing temperature of carbide, and HGI. It is a graph which shows the relationship between the processing temperature of a carbide | carbonized_material, and a weight / calorie | heat amount residual ratio. 1 is an overall configuration diagram of a system according to Embodiment 1 of the present invention. It is a whole block diagram of the system which concerns on Example 2 of this invention.

Explanation of symbols

1 Carbonization furnace 2 Combustion furnace 3 Boiler 12 Inner cylinder 13 Outer cylinder 14 Solid fuel outlet 15 Pyrolysis gas outlet 21 Solid fuel 22 Pyrolysis gas line 23 Combustion air 24, 27 Combustion gas line 25 Boiler exhaust gas line 26 Return gas line 28 Carbonization furnace exhaust gas line 29 Coal 33 Pulverizer 34 Boiler furnace 35 Exhaust gas treatment equipment

Claims (9)

In a solid fuel production method for producing a solid fuel mixed with coal or pulverized alone and used as a pulverized fuel by heating biomass in an oxygen-deficient atmosphere,
The solid fuel is produced by carbonizing a hard biomass containing plant shells, berries and seeds at an oxygen concentration of 1 to 5% and a treatment temperature of 350 to 400 ° C. for 30 to 90 minutes. A method for producing solid fuel. In a solid fuel production method for producing a solid fuel mixed with coal or pulverized alone and used as a pulverized fuel by heating biomass in an oxygen-deficient atmosphere,
Heat hard biomass including plant shells, berries and seeds for 30 to 90 minutes at a treatment temperature at which oxygen concentration is 1 to 5% and HGI (hard glove grindability index) of the produced solid fuel is 30 to 60 And producing the solid fuel by carbonizing the solid fuel.   The solid fuel production method according to claim 1 or 2, wherein the pyrolysis gas generated by the carbonization treatment of the hard biomass is burned, and the generated combustion gas is used as a heat source for the carbonization treatment. In a solid fuel production system comprising a carbonization furnace for heating biomass in an oxygen-deficient atmosphere and producing solid fuel that is mixed with coal or pulverized alone and used as pulverized fuel,
The carbonization furnace is set to in-furnace conditions with an oxygen concentration of 1 to 5% and a processing temperature of 350 to 400 ° C., and the hard biomass containing plant shells, fruits and seeds is heated for 30 to 90 minutes under the above conditions. The solid fuel production system is a device for producing the solid fuel by performing carbonization treatment. A combustion furnace for burning the pyrolysis gas generated in the carbonization furnace,
The solid fuel production system according to claim 4, further comprising a combustion gas line that supplies at least a part of the combustion gas generated in the combustion furnace to the carbonization furnace as a heat source for the carbonization treatment. Combusting the pulverized pulverized fuel by pulverizing the solid fuel, comprising a boiler furnace for generating steam,
6. The solid according to claim 5, further comprising a combustion gas line for branching the combustion gas line and supplying a combustion gas other than the combustion gas supplied to the carbonization furnace to a heat exchange section of the boiler furnace. Fuel production system. A system comprising a boiler furnace that combusts pulverized pulverized fuel by pulverizing the solid fuel and generates steam, and an exhaust gas treatment facility that processes exhaust gas discharged from the boiler furnace,
7. An exhaust gas line for supplying exhaust gas from the carbonization furnace to the exhaust gas treatment facility is provided, and the exhaust gas from the carbonization furnace and the exhaust gas from the boiler furnace are both treated. The solid fuel production system described. In the solid fuel used as a pulverized fuel mixed with coal or pulverized alone,
Solids produced by carbonizing a hard biomass containing plant shells, berries and seeds at an oxygen concentration of 1 to 5% and a treatment temperature of 350 to 400 ° C. for 30 to 90 minutes. fuel. In the solid fuel used as a pulverized fuel mixed with coal or pulverized alone,
By carbonizing hard biomass containing plant shells, berries and seeds at an oxygen concentration of 1 to 5% and a treatment temperature at which the HGI of the produced solid fuel is 30 to 60 for 30 to 90 minutes A solid fuel manufactured.

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