JP6815545B1 - Molding fuel, manufacturing method and gasification method of molding fuel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of clinker which is a generation factor by a melt of potassium carbonate in a gasifier. SOLUTION: The molding fuel is composed of a woody biomass raw material in which potassium oxide is 20 wt% or more when calculated in terms of oxides of the composition of the ash obtained by the gasification method based on ISO18122: 2015, and is a main gas. It is used in a gasification furnace (10) of a fixed bed type or a solid gas moving bed type in which the gasification region is 1000 ° C. or less. The molding fuel contains an oxygen-containing aluminum compound that reacts with a potassium-containing compound in a gasified atmosphere, and a clinker production inhibitor that suppresses the production of clinker (50) by suppressing the production of potassium carbonate in the liquid phase is a woody biomass. It contains only the amount set according to the amount of potassium in the raw material. [Selection diagram] Fig. 1

Description

The present invention relates to a technical field of a molding fuel used for, for example, biomass power generation, a method for producing the molding fuel, and a gasification method.

During combustion of the biomass fuel in equipment biomass boiler, i.e. 1000 ° C. In the above atmosphere, K _{2 O} and SiO ₂ derived from the ash agglomerates contained in biomass fuels (clinker) is, grate, exhaust gas flow channel wall or heat transfer It often adheres to the hot surface or the like. As a result, for example, combustion disappears, heat transfer efficiency decreases, and maintenance frequency increases, which hinders long-term stable operation. Therefore, for example, Patent Document 1 discloses a technique of raising the melting point of ash and suppressing the generation of clinker by mixing a Group 2 element compound at the time of producing a biomass fuel.

Even in coal combustion by equipment such as a coal boiler, slacking (blockage by clinker) due to a decrease in ash melting point due to silicate formation caused by a base component containing potassium often occurs. Therefore, Patent Document 2 discloses an anti-slacking agent containing an oxygen-containing Al compound and the like.

JP-A-2017-210574 Japanese Unexamined Patent Publication No. 2010-235822 International Publication No. 2010/046222

Biomass fuel is not only burned under oxygen excess conditions, but also gasified under oxygen deficiency conditions (that is, a reducing atmosphere) in a gasifier such as a gasifier as described in Patent Document 3 described above to generate electricity. It is also possible to generate energy by generating electricity with a gas engine using gas. However, even when the biomass fuel is gasified, clinker may be generated in the gasifier.

According to the research by the inventors of the present application, for example, the clinker generated in the fixed-bed / moving-bed type gasification furnace having a furnace temperature of 1000 ° C. or less is a clinker generated in a gasification atmosphere (that is, a reduction atmosphere). , Potassium carbonate has been found to be the main component. Further, such a clinker containing potassium carbonate as a main component is caused by a base component containing potassium generated at the time of combustion (that is, 1000 ° C. or higher and an oxidizing atmosphere), which is the target of Patent Documents 1 and 2 described above. It has also been found that the generation principle is different from that of silicate-derived clinker. Therefore, according to the inventors of the present application, the generation of clinker in the gasifier can be effectively suppressed only by applying the technique described in the above-mentioned patent document (that is, the technique assuming only the oxidizing atmosphere). A technical problem has been identified that it is not easy to do.

The present invention has been made in view of the above problems, for example, and an object of the present invention is to provide a molded fuel, a molding fuel manufacturing method, and a gasification method capable of suppressing the generation of clinker in a gasification apparatus. To do.

One aspect of the molded fuel according to the present invention comprises a woody biomass raw material in which potassium oxide is 20 wt% or more when calculated in terms of oxides in the composition of the ash obtained by the gasification method based on ISO18122: 2015. A molded fuel used in a fixed-bed or solid-gasified moving-bed gasification furnace, which contains an oxygen-containing aluminum compound that reacts with a potassium-containing compound in a region where the gasification atmosphere is 1000 ° C. or lower, and contains carbon dioxide in the liquid phase. It contains a clinker production inhibitor that suppresses the production of clinker by suppressing the production of potassium in an amount set according to the amount of potassium in the woody biomass raw material.

One aspect of the method for producing a molded fuel according to the present invention is a woody biomass raw material in which potassium oxide is 20 wt% or more when the composition of the ash content obtained by the gasification method based on ISO18122: 2015 is calculated in terms of oxide. It is a method for producing a molded fuel used in a gasification furnace of a fixed bed type or a solid air moving bed type, and is 1000 ° C. or lower by suppressing the production of liquid phase potassium carbonate in the woody biomass raw material. A step of adding and mixing a clinker production inhibitor that suppresses the formation of clinker in a region having a gasification atmosphere by an amount set according to the amount of potassium in the woody biomass raw material, and the woody biomass raw material and the clinker production inhibitor. The clinker production inhibitor comprises a step of forming a mixture with and is composed of an oxygen-containing aluminum compound that reacts with a potassium-containing compound containing potassium as a main component in the gasification atmosphere.

One aspect of the method for gasifying a molded fuel according to the present invention is a step of preparing a molded fuel produced by the above-mentioned method for producing a molded fuel and gasifying the molded fuel in a gasification atmosphere of 1000 ° C. or lower. Including the process.

It is sectional drawing which shows the state inside the gasification furnace at the time of gasifying biomass fuel. It is a top view which shows an example of the clinker generated at the time of gasification. It is a graph which shows the relationship between the temperature in a gasification furnace and the production ratio of a potassium-containing compound in a gasification furnace in the ash content composition of a biomass fuel. It is a graph which shows the relationship between the temperature in a gasification furnace and the production ratio of a potassium-containing compound in a gasification furnace when a clinker inhibitor is added to a biomass fuel. It is a graph which shows the relationship between the addition amount of alumina with respect to a biomass fuel, and the production ratio of a potassium-containing compound in a gasification furnace. It is a table which shows the difference in the generation rate of clinker when the clinker production inhibitor is added to the biomass fuel. It is a map showing the relationship between the operation time of the gasifier and the cumulative amount of clinker generated. It is a map showing the relationship between the amount of alumina added to the biomass fuel and the clinker generation rate. It is a table which shows the element composition by fluorescent X-ray analysis of the residue in a furnace before and after addition. It is a flowchart which shows the flow of the manufacturing method of the biomass fuel which concerns on embodiment. It is a flowchart which shows the manufacturing flow of the alumina and aluminum hydroxide added pellets.

Hereinafter, embodiments of a molding fuel, a method for producing the molding fuel, and a gasification method will be described with reference to the drawings. In the following, as an example of a gasifier for burning molded fuel, an upward solid-air parallel flow type gasifier will be described.

<Clinker generation in gasifier>
First, a gasification furnace for gasifying biomass fuel, which is a molding fuel, and a clinker generated in the gasification furnace will be described with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view showing a state inside the gasification furnace when gasifying biomass fuel (more specifically, gasification of an upward solid air parallel flow method as described in Patent Document 3). It is a schematic diagram of a furnace). FIG. 2 is a top view showing an example of clinker generated during gasification. FIG. 3 is a graph showing the relationship between the temperature in the gasification furnace and the production ratio of the potassium-containing compound in the gasification furnace in the ash composition of the biomass fuel. Note that FIGS. 2 and 3 show a state when the biomass fuel according to the comparative example (specifically, the biomass fuel to which the clinker production inhibitor described later is not added) is gasified.

As shown in FIG. 1, the biomass fuel (for example, woody biomass pellets) is gasified inside a reaction vessel called a gasifier 10. Specifically, when the biomass fuel is put into the gasification furnace 10, it is thermally decomposed in the thermal decomposition zone. After that, it reacts with air or the like in the oxidation zone to be oxidized, and undergoes a reduction reaction in the reduction zone to generate flammable gas. The gas generated in this way is supplied to a generator, for example, and used for power generation (that is, biomass power generation) or the like.

As shown in FIG. 2, a residue called clinker 50 may be generated inside the gasification furnace 10 by a reaction when the biomass fuel is gasified (specifically, a reduction reaction in the reduction zone). is there. The clinker 50 is an agglomerate mainly composed of ash and incorporating char and fly ash. Initially, the clinker 50 has a pyrolysis zone (see FIG. 1) and an oxidation zone (see FIG. 1) or an oxidation zone and a reduction zone (see FIG. 1). Although it occurs at the boundary, it increases according to the operating time of the gasifier 10, and may be large enough to fill the cross section of the gasifier 10. If such a clinker 50 is generated, the normal reaction in the gasification furnace 10 is hindered, and as a result, the normal gasification of the biomass fuel cannot be performed.

The graph shown in FIG. 3 shows the ash content of a biomass fuel containing potassium in a gasified atmosphere containing carbon dioxide, using thermodynamic equilibrium calculation software that calculates the equilibrium state in which the Gibbs free energy at each temperature becomes zero. It is calculated based on the composition. As the initial condition, the element composition (see "Table 1" below) measured by fluorescent X-ray analysis of woody biomass pellets made from cedar is used.

In order to analyze the elemental composition of wood-based biofuels, ashing must be performed, but in order to obtain accurate measurement results, an ashing method based on ISO18122: 2015 Solid biofuels-Determination of asc content was adopted. .. That is, woody biomass basically contains calcium and potassium as main components, and since this potassium has the property of volatilizing at 800 ° C. or higher, the ashing temperature ° C. is 550 ° C. as specified in ISO18122: 2015. By incineration in the vicinity, accurate ash composition measurement results including potassium can be obtained.

In addition, Table 1 shows the inorganic elements obtained by measuring the ash composition in terms of oxides.

It can be seen that calcium and potassium are abundant as the characteristics of the above elemental composition. The atmosphere is calculated under a gasification atmosphere containing carbon dioxide gas.

According to the research by the inventor of the present application, the main cause of clinker 50 generation is a melt of potassium compounds (particularly potassium carbonate (K ₂ CO ₃ )) generated inside the gasifier 10. It is known. This potassium compound is generated from potassium contained in the biomass fuel, and is generated in a gasification atmosphere (that is, a reducing atmosphere). For example, potassium carbonate is generated by the reaction of carbon dioxide gas and potassium content, such as K ₂ O + CO 2 → K ₂ CO ₃ or 2K ₂ O + ₃ CO → 2 K ₂ CO ₃ . From the graph of FIG. 3, it can be seen that liquid potassium carbonate (see the dotted line in the figure) is abundantly generated in the temperature range of 900 ° C. to 950 ° C. corresponding to the temperature range of the place where the clinker 50 is generated. That is, the clinker 50 is generated by a melt of potassium carbonate mainly caused by potassium, instead of the silicate-based clinker made of silica and potassium, which is a problem in biomass boilers and the like. Since the potassium carbonate melt is generated in the vicinity of 900 ° C to 950 ° C, the clinker 50 is used in a fixed-bed or solid-air moving-bed gasification furnace in which the main gasification region temperature is 1000 ° C or lower. Occurrence becomes a problem.

In the biomass fuel according to the present embodiment, a clinker production inhibitor is added at the time of production in order to suppress the generation of the potassium carbonate melt that causes the above-mentioned clinker 50. The clinker production inhibitor is not intended to raise the melting point of the woody biomass fuel, but to change the state in which potassium carbonate is generated in the gasification atmosphere to the state in which the compound of aluminum and potassium in the added clinker production inhibitor is generated. Is added to. Therefore, the amount of the clinker production inhibitor added to the biomass fuel may be set according to the potassium content of the biomass fuel. That is, a clinker production inhibitor of a predetermined ratio or more with respect to the potassium content is added to the biomass fuel. In this way, if the clinker production inhibitor is added to the biomass fuel, the amount of potassium carbonate melt generated during gasification can be reduced, so that the generation of clinker 50 caused by the potassium carbonate melt is suppressed. It is possible.

<Changes due to addition of clinker production inhibitor>
Next, the changes during gasification due to the addition of the clinker production inhibitor to the biomass fuel will be specifically described with reference to FIGS. 4 and 5. FIG. 4 shows the ash composition of Table 1 when the clinker production inhibitor was added so that the value obtained by dividing the molar amount of aluminum in alumina by the molar amount of potassium in the biomass fuel was 0.46. It is a graph which shows the relationship between the furnace temperature and the production ratio of a potassium-containing compound. FIG. 5 is a graph showing the relationship between the value obtained by dividing the molar amount of aluminum in alumina by the molar amount of potassium in the biomass fuel and the production ratio of the potassium-containing compound in the gasification furnace. Note that FIG. 4 shows the initial conditions of the biomass fuel added so that the value obtained by dividing the molar amount of aluminum in alumina by the molar amount of potassium in the biomass fuel to the ash composition in Table 1 is 0.46. In FIG. 5, the value obtained by increasing the amount of alumina with respect to the ash composition in Table 1 was used as the initial condition, and the calculation was performed using the same thermodynamic equilibrium calculation software as in FIG.

Comparing FIG. 4 and FIG. 3, it can be seen that the potassium carbonate melt generated at 900 ° C. to 950 ° C. was not generated, the potassium in the biomass fuel reacted with aluminum, and KAO ₂ was generated. .. That is, as described above, it can be seen that the state in which potassium carbonate is generated in the gasification atmosphere is the state in which the compound of aluminum and potassium in the added clinker production inhibitor is generated.

As shown in FIG. 5, as an example of the clinker production inhibitor according to the present invention, as the addition amount of aluminum oxide, that is, alumina increases, that is, the molar amount of aluminum in alumina is divided by the molar amount of potassium in the biomass fuel. As the value increases, the maximum amount (peak ratio) of the potassium carbonate melt generated during gasification decreases. Further, when the ratio of the molar amount of aluminum in alumina to the molar amount of potassium in the biomass fuel is about 0.28, the ratio of the potassium carbonate melt becomes almost zero (that is, at least in an equilibrium state). Almost no potassium melt is generated).

From the above results, considering that when alumina is added to the biomass fuel as an example of the clinker production inhibitor according to the present invention, the main component of the clinker 50 is a melt of potassium carbonate, the clinker 50 is used. It can be seen that the effect of suppressing is obtained. Further, since the generation of the melt of potassium carbonate is suppressed by reacting the biomass fuel-containing potassium with aluminum, clay minerals containing aluminum hydroxide and aluminum elements (for example, kaolin, dolomite, etc.) are used in addition to alumina. The same effect can be obtained even when added. Further, these clinker production inhibitors may be added alone or in combination of two or more.

In addition, the ash composition in the biomass fuel, especially potassium, varies greatly depending on the tree species and sample location. For example, Table 2 shows the ash composition weight ratios of Sugi samples and German spruce at four different sample locations in terms of oxides. As can be seen from the weight ratio of potassium oxide, it can be seen that the amount of potassium oxide varies even in the same type of sugi. According to the applicants of the present application, it is known that the weight ratio of potassium oxide obtained by converting potassium into an oxide of the biomass fuel for which the present invention is effective is 20 wt% or more. For example, when the gasification furnace 10 is operated using the Sugi samples A and B in Table 2, the inhibition of the gasification reaction due to the generation of clinker has become a problem, and the technique of the present invention is effective. Regarding C, inhibition of the gasification reaction due to the generation of clinker in the gasification furnace did not pose a problem even if the technique of the present invention was not applied. Further, as can be seen from Table 2, it is known that Japanese wood used as a biomass fuel, for example, Sugi, has a higher potassium compound content than wood in other regions, such as European spruce. It is known that the present invention is particularly effective for Sugi.

<Clinker suppression effect>
Next, the clinker-suppressing effect obtained by adding the clinker production inhibitor to the biomass will be described more specifically with reference to FIGS. 6 to 9. FIG. 6 is a table showing the difference in the generation rate of clinker when a clinker production inhibitor is added to the biomass fuel. FIG. 7 is a map showing the relationship between the continuous operation time of the gasifier and the cumulative amount of clinker generated. FIG. 8 is a map showing the relationship between the amount of alumina added to the biomass fuel and the clinker generation rate. FIG. 9 is a table showing the elemental composition by fluorescent X-ray analysis of the residue in the furnace before and after the addition.

As shown in FIG. 6, according to an experiment by the inventor of the present application, when the clinker production inhibitor is not added to the biomass fuel, 77.3 kg of clinker 50 is generated when the gasifier 10 is continuously operated for 166 hours. Results have been obtained. That is, 0.47 kg of clinker 50 is generated per hour of operation.

On the other hand, when aluminum hydroxide is added to the biomass fuel, the result is that even if the gasifier 10 is continuously operated for 715 hours, only 16.6 kg of clinker 50 is produced. That is, the amount of clinker generated per hour of operation is suppressed to 0.023 kg. Further, when aluminum hydroxide was added to the biomass fuel, the gasifier 10 could be continuously operated for 1219 hours, that is, for about 7 weeks. The amount of clinker 50 generated at this time is 57.7 kg, that is, the amount of clinker generated per hour of operation is suppressed to 0.047 kg. That is, the generation rate of the clinker 50 is suppressed to the order of 1/10 as compared with the case where the clinker production inhibitor is not added. As described above, it is known that the generation of clinker 50 can be reliably suppressed by adding the clinker production inhibitor.

As shown in FIG. 7, it has been proved that the biomass fuel according to the present embodiment has an effect of suppressing the clinker 50 even by a plurality of experiments using the gasifier 10. Specifically, when the clinker production inhibitor is not added to the biomass fuel (that is, when the biomass fuel according to the comparative example is used), the amount of clinker 50 generated is also accumulated according to the continuous operation time of the gasifier 10. There is a clear tendency to increase. On the other hand, when alumina or aluminum hydroxide is added to the biomass fuel (that is, when the biomass fuel according to the present embodiment is used), the generation rate of the clinker 50 is extremely higher than that when the clinker production inhibitor is not added. It is suppressed.

As shown in FIG. 8, when the addition amount of alumina or aluminum hydroxide is increased, that is, the ratio of the molar amount of aluminum in the clinker production inhibitor to the molar amount of potassium in the woody biomass fuel is increased. , It can be seen that the clinker generation rate decreases exponentially (the vertical axis in the figure is the logarithmic axis). According to the experiments by the inventors of the present application, it is known that in the gasification furnace 10, the gasification reaction is likely to be inhibited when about 85 kg of clinker is generated, which is an ideal continuous operation time of the gasification furnace 10 of 650. It has been found that a clinker production rate of 0.13 kg / hour is sufficient to achieve more than an hour. (Point A in FIG. 10).

However, in order to carry out more stable continuous operation of the gasification furnace, it is preferable that the amount of clinker generated is suppressed to about 25 kg, and it is known that the clinker generation rate needs to be 0.04 kg / hour. That is, in order for the clinker production inhibitor to operate continuously without inhibiting the gasification of the clinker 50, the ratio of the molar amount of aluminum in the clinker production inhibitor to the molar amount of potassium in the woody biomass fuel is 0. A clinker production inhibitor may be added to the woody biomass fuel so that the fuel becomes 25 or more, and 0.9 or more for more stable continuous operation.

As shown in FIG. 9, the elemental composition of the residue (char, clinker, and fly ash) in the furnace after the operation of the gasification furnace 10 is clear when aluminum hydroxide is not added and when it is added. Make a difference. The "char" here is present in the reduction zone (see FIG. 1) in the gas furnace 10 and is carbonized biomass fuel. Further, "fly ash" is a substance in which char is gasified by a reduction reaction in the same reduction zone, and powdered material is discharged to the outside of the furnace together with the generated gas.

If the plant is operated without the addition of aluminum hydroxide, char, the content of the oxide conversion display potassium compound of the clinker (K 2 _O) is large, the fly ash is relatively small. On the other hand, when the operation is performed with the addition of aluminum hydroxide, the amount of aluminum contained in the char is increased by the amount of the addition of aluminum hydroxide, and the amount of potassium is slightly decreased but still large. On the other hand, the potassium content in clinker is significantly reduced. It can also be seen that the potassium content of fly ash is increasing. From this, it can be seen that by suppressing the generation of potassium carbonate, which is the main component of clinker, the potassium content does not become clinker and is discharged to the outside of the furnace as it is as fly ash.

As described above, according to the woody biomass fuel according to the present embodiment, the clinker 50 is generated in the gasification furnace 10 because the clinker production inhibitor is added according to the potassium content in the woody biomass fuel. (More specifically, the generation of the clinker 50 derived from the melt of potassium carbonate in the gasification atmosphere) can be effectively suppressed. In particular, for biomass fuels produced from raw materials containing a large amount of potassium compounds, the amount of potassium carbonate melt generated in a gasified atmosphere is large, so the weight of potassium oxide converted from potassium in the biomass fuel as an oxide is large. When a woody biomass raw material having a ratio of 20 wt% or more is used, the technical effect of the present embodiment is remarkably exhibited.

<Biomass fuel manufacturing method>
Next, a method for producing biomass fuel will be described with reference to FIG. FIG. 10 is a flowchart showing the flow of the method for producing biomass fuel according to the embodiment.

As shown in FIG. 10, at the time of producing the biomass fuel, the fuel processing process (that is, processing the biomass raw material into the biomass fuel) is performed with respect to the procured biomass raw material (that is, the raw material of the biomass fuel) (step S11). Process) is executed (step S12). For example, biomass fuel is processed as pellets and briquettes. After that, the processed biomass fuel is put into the gasification furnace (step S13).

Here, in the present embodiment, in particular, a clinker production inhibitor is added during the fuel processing process (step S14). For example, when the biomass fuel is pellets or briquettes, the clinker production inhibitor may be added to the biomass raw material at a constant ratio during fixing molding.

<Example>
Next, as a specific example of the method for producing biomass fuel according to the present embodiment, a method for producing pellets to which alumina or aluminum hydroxide is added will be described with reference to FIG. FIG. 11 is a flowchart showing a production flow of alumina and aluminum hydroxide-added pellets.

As shown in FIG. 11, when producing pellets as a biomass fuel, first, the raw wood procured as the biomass fuel (step S21) is pulverized with a shaving machine (step S22), and the raw material is pulverized. Dry until the moisture content is around 10% (step S23). Subsequently, the dried Oga powder is put into a granulator and pelletized (step S24). Then, the pelletized product is cooled by a cooler (step S25) and sieved (step S26) to produce pellets having a predetermined length. The biomass fuel is put into the gasification furnace in this state (step S27).

In this embodiment, after drying the pulverized raw material, alumina or aluminum hydroxide is added at a timing before granulation (step S28). More specifically, alumina or aluminum hydroxide is added in the powder conveyor line in front of the granulator. Alumina and aluminum hydroxide are added at a constant ratio with respect to the amount of powder used in the granulator. When alumina or aluminum hydroxide is added in this way, the input amount can be controlled by using a feeder, so that the addition amount can be freely set.

<Gasification method of biomass fuel>
Next, a method for gasifying biomass fuel will be described. The woody biomass fuel produced by the above-mentioned biomass fuel production method is pyrolyzed in a fixed-bed / solid-air moving-bed type gasifier including an upward solid-air parallel flow method using a gasifier 10 as an example. It is a method of gasifying in a gasification atmosphere of 1000 ° C. or lower through a step including a partial oxidation and reduction zone.

In particular, since the potassium carbonate melt is generated in the vicinity of 900 ° C. to 950 ° C., the clinker suppressing effect is remarkably exhibited in the gasification furnace in which the main gasification region temperature is 1000 ° C. or lower. In the partial oxidation zone and the like, the temperature may exceed 1000 ° C microscopically, but such a gasification furnace is also included in the gasification furnace whose main gasification region temperature is 1000 ° C. or lower.

<Additional notes>
Various aspects of the invention derived from the embodiments described above will be described below.

(Appendix 1)
The molding fuel described in Appendix 1 is made of a woody biomass raw material having a potassium oxide content of 20 wt% or more when calculated in terms of oxides in the composition of the ash obtained by the gasification method in accordance with ISO18122: 2015, and has a fixed bed. A molding fuel used in a gasification furnace of a method or a solid-gas moving bed type, which contains an oxygen-containing aluminum compound that reacts with a potassium-containing compound in a region where a gasification atmosphere is 1000 ° C. or lower, and contains potassium carbonate in a liquid phase. It contains a clinker production inhibitor that suppresses the production of clinker by suppressing the production in an amount set according to the amount of potassium in the woody biomass raw material.

According to the molded fuel described in Appendix 1, the production of clinker in the gasification furnace can be suppressed by suppressing the production of potassium carbonate in the liquid phase. In particular, since the clinker production inhibitor is contained in an amount set according to the amount of potassium in the woody biomass raw material, clinker derived from potassium can be effectively suppressed.

(Appendix 2)
The molding fuel according to Appendix 2 has a value obtained by dividing the molar amount of Al in the clinker production inhibitor by the molar amount of K in the woody biomass raw material to be 0.25 or more.

According to the molding fuel described in Appendix 2, the ratio of the molar amount of Al of the clinker production inhibitor and the molar amount of K in the woody biomass raw material is appropriately adjusted, so that the clinker is suppressed more effectively. can do.

(Appendix 3)
The molding fuel according to Appendix 3 has a value obtained by dividing the molar amount of Al in the clinker production inhibitor by the molar amount of K in the woody biomass raw material to be 0.9 or more.

According to the molding fuel described in Appendix 3, the ratio of the molar amount of Al of the clinker production inhibitor and the molar amount of K in the woody biomass raw material is appropriately adjusted, so that the clinker is suppressed more effectively. can do.

(Appendix 4)
In the molding fuel according to Appendix 4, the oxygen-containing aluminum compound comprises at least one of aluminum oxide, aluminum hydroxide, and clay mineral.

According to the research by the inventors of the present application, it has been found that clinker can be suitably suppressed by using at least one of aluminum oxide, aluminum hydroxide or clay mineral as the oxygen-containing aluminum compound.

(Appendix 5)
In the molding fuel according to Appendix 5, the main component of the woody biomass raw material is sugi.

According to the research by the inventors of the present application, it is known that Sugi used as a biomass fuel (particularly Japanese Sugi) has a relatively high content of potassium compounds. Therefore, when sugi is the main component, an extremely beneficial effect can be obtained by containing a clinker production inhibitor.

(Appendix 6)
The molding fuel according to Appendix 6 is molded into pellets.

Molded fuel molded into pellets is easy to manufacture and handle and is suitable for gasification in a gasifier.

(Appendix 7)
As for the molded fuel according to Appendix 7, the gasification furnace is a solid-gas moving bed type gasification furnace.

According to the molded fuel described in Appendix 7, it is possible to suitably suppress the generation of clinker in the solid-gas moving bed type gasification furnace.

(Appendix 8)
The method for producing a molded fuel according to Appendix 8 comprises a woody biomass raw material in which potassium oxide is 20 wt% or more when the composition of ash obtained by the gasification method based on ISO18122: 2015 is calculated in terms of oxide. , A method for producing molded fuel used in a gasification furnace of a fixed bed method or a solid air moving bed method, in which the woody biomass raw material is gasified at 1000 ° C. or lower by suppressing the formation of potassium carbonate in the liquid phase. A step of adding and mixing a clinker production inhibitor that suppresses the formation of clinker in an atmospheric region by an amount set according to the amount of potassium in the woody biomass raw material, and the woody biomass raw material and the clinker production inhibitor. The clinker production inhibitor comprises a step of forming a mixture, and comprises an oxygen-containing aluminum compound that reacts with a potassium-containing compound containing potassium as a main component in the gasification atmosphere.

According to the molding fuel production method described in Appendix 8, it is possible to produce a molding fuel capable of suppressing the production of clinker derived from potassium.

(Appendix 9)
In the method for producing a molded fuel according to Appendix 9, the value obtained by dividing the molar amount of Al in the clinker production inhibitor by the molar amount of K in the woody biomass raw material is 0.25 or more.

According to the molding fuel production method described in Appendix 9, the ratio of the molar amount of Al of the clinker production inhibitor to the molar amount of K in the woody biomass raw material is appropriately adjusted, so that the clinker is more effectively used. Can be suppressed.

(Appendix 10)
In the method for producing a molded fuel according to Appendix 10, the value obtained by dividing the molar amount of Al in the clinker production inhibitor by the molar amount of K in the woody biomass raw material is 0.9 or more.

According to the molding fuel production method described in Appendix 10, the ratio of the molar amount of Al of the clinker production inhibitor to the molar amount of K in the woody biomass raw material is appropriately adjusted, so that the clinker is more effectively used. Can be suppressed.

(Appendix 11)
In the method for producing a molded fuel according to Appendix 11, the oxygen-containing aluminum compound comprises at least one of aluminum oxide, aluminum hydroxide, and a clay mineral.

According to the research by the inventors of the present application, it has been found that clinker can be suitably suppressed by using at least one of aluminum oxide, aluminum hydroxide or clay mineral as the oxygen-containing aluminum compound.

(Appendix 12)
In the method for producing a molded fuel according to Appendix 12, the main component of the woody biomass raw material is sugi.

According to the research by the inventors of the present application, it is known that Sugi used as a biomass fuel (particularly Japanese Sugi) has a relatively high content of potassium compounds. Therefore, when sugi is the main component, an extremely beneficial effect can be obtained by containing a clinker production inhibitor.

(Appendix 13)
In the method for producing a molding fuel according to Appendix 13, a mixture of the woody biomass raw material and the clinker production inhibitor is molded into pellets.

Molded fuel molded into pellets is easy to manufacture and handle and is suitable for gasification in a gasifier.

(Appendix 14)
In the method for producing a molded fuel according to Appendix 14, the gasification furnace is a solid-gas moving bed type gasification furnace.

According to the molding fuel manufacturing method described in Appendix 14, it is possible to manufacture a molding fuel capable of suitably suppressing the generation of clinker in a solid-gas mobile bed type gasification furnace.

(Appendix 15)
The method for gasifying the molded fuel according to Appendix 15 includes a step of preparing a molded fuel produced by the method for producing a molded fuel according to any one of Appendix 8 to Appendix 14, and the molding fuel at 1000 ° C. or lower. Including the step of gasifying in the gasification atmosphere of.

According to the method for gasifying molded fuel according to Appendix 15, it is possible to effectively suppress clinker generated in the gasification step.

The present invention is not limited to the above-described embodiment, and can be appropriately modified within the scope of claims and within a range not contrary to the gist or idea of the invention that can be read from the entire specification, and the molding fuel and molding accompanied by such a modification. Fuel production methods and gasification methods are also included in the technical scope of the present invention.

10 gasifier 50 clinker

Claims (13)

It is made of woody biomass raw material with potassium oxide of 20 wt% or more when calculated in terms of oxides in the composition of the ash obtained by the gasification method based on ISO18122: 2015, and is a fixed-bed or solid-air mobile bed-type gas. Molded fuel used in gasifiers
Include oxygen-containing aluminum compound which react with potassium-containing compound in the region to be the gasification atmosphere of 1000 ° C. or less, to suppress clinker production inhibitor of the formation of clinker by inhibiting the production of potassium carbonate in the liquid phase, the clinker A molding fuel characterized in that the value obtained by dividing the molar amount of Al in the production inhibitor by the molar amount of K in the woody biomass raw material is 0.25 or more . The molded fuel according to claim 1, wherein the value obtained by dividing the molar amount of Al in the clinker production inhibitor by the molar amount of K in the woody biomass raw material is 0.9 or more. The molded fuel according to claim 1 or 2 , wherein the oxygen-containing aluminum compound comprises at least one of aluminum oxide, aluminum hydroxide, and a clay mineral. The molded fuel according to any one of claims 1 to 3 , wherein the woody biomass raw material is mainly composed of sugi. The molded fuel according to any one of claims 1 to 4 , wherein the molded fuel is molded into pellets. The molded fuel according to any one of claims 1 to 5 , wherein the gasification furnace is a solid-gas moving bed type gasification furnace. When the composition of the ash obtained by the ashing method conforming to ISO18122: 2015 is calculated in terms of oxide, it is made of woody biomass raw material with potassium oxide of 20 wt% or more, and is a fixed bed method or solid moving bed type gas. A method for producing molded fuel used in gasifiers.
In the woody biomass raw material, a clinker production inhibitor that suppresses the production of clinker in a region where the gasification atmosphere is 1000 ° C. or lower by suppressing the production of potassium carbonate in the liquid phase is added to the Al in the clinker production inhibitor. A step of adding and mixing so that the value obtained by dividing the molar amount by the molar amount of K in the woody biomass raw material is 0.25 or more .
A step of molding a mixture of the woody biomass raw material and the clinker production inhibitor, and
Includes
A method for producing a molded fuel, wherein the clinker production inhibitor is composed of an oxygen-containing aluminum compound that reacts with a potassium-containing compound containing potassium as a main component in the gasification atmosphere. The method for producing a molded fuel according to claim 7 , wherein the value obtained by dividing the molar amount of Al in the clinker production inhibitor by the molar amount of K in the woody biomass raw material is 0.9 or more. The method for producing a molded fuel according to claim 7 or 8 , wherein the oxygen-containing aluminum compound comprises at least one of aluminum oxide, aluminum hydroxide, and a clay mineral. The woody biomass feedstock, the production method of molding a fuel according to any one of claims 7 to 9, characterized in that the main component is cedar. The wood a mixture of biomass feedstock and the clinker formation inhibitor, a manufacturing method of molding a fuel according to any one of claims 7 to 10, characterized in that molded into pellets. The gasification furnace method of manufacturing a molded fuel according to any one of claims 7 to 11, characterized in that a gasifier gas-solid moving bed. Preparing a molded fuel produced by the production method of molding a fuel according to any one of claims 7 to 12,
A step of gasifying the molded fuel in a gasification atmosphere of 1000 ° C. or lower, and
A method for gasifying a molded fuel, which comprises.