WO2017183529A1

WO2017183529A1 - Method for operating boiler and boiler equipment

Info

Publication number: WO2017183529A1
Application number: PCT/JP2017/014921
Authority: WO
Inventors: 知朗松宮; 勝哉秋山
Original assignee: 株式会社神戸製鋼所
Priority date: 2016-04-19
Filing date: 2017-04-12
Publication date: 2017-10-26
Also published as: JP6577407B2; JP2017194207A; CN108884991B; CN108884991A

Abstract

This method for operating a boiler includes: a step of acquiring ash content of a plurality of kinds of solid fuels and specific surface areas of the plurality of kinds of solid fuels after incineration; and a step of determining a mixing ratio of the plurality of kinds of solid fuels on the basis of the ash content and the specific surface area after incineration of each of the plurality of kinds of solid fuels acquired in the step of acquiring ash contents and specific surface areas so that the specific surface area after incineration of the entire mixture of the plurality of kinds of solid fuels is less than or equal to a reference value.

Description

Boiler operation method and boiler equipment

The present invention relates to a boiler operating method and boiler equipment.

For example, a boiler that burns solid fuel such as coal generally includes a furnace that burns solid fuel using, for example, a burner, and a plurality of heat transfer tubes that are arranged in the furnace in the vertical direction to exchange heat. For example, in a boiler used in a thermal power plant, the heat transfer tube is disposed in the primary heater, the primary reheater, and the economizer in the lower part of the furnace, and in the upper part of the furnace. A secondary heater, a tertiary heater, a final heater, and an upper heat transfer section that exchange heat in the secondary reheater.

Among such boilers, for example, in pulverized coal boilers using coal as a solid fuel, slagging and fouling occurs in which ash in the combustion gas generated by the combustion of coal adheres to the furnace walls and heat transfer tubes of the furnace and accumulates, An ash adhesion layer may be formed. When such ash adhesion occurs, the heat recovery rate at the heat transfer surface of the heat transfer tube is likely to be greatly reduced. Further, when the ash (clinker) adhering to the furnace wall becomes enormous, it may fall from the furnace wall or the like, resulting in a significant fluctuation in the furnace pressure, damage to the heat transfer tube, blockage of the gas flow path, or the like.

In particular, the upper heat transfer section has a structure in which the combustion gas flows between the heat transfer tubes arranged at a narrower interval than the lower heat transfer section to exchange heat, so that ash is formed in the upper heat transfer section. If it adheres, a large fluctuation of the furnace pressure and a blockage of the gas flow path are likely to occur, and the stable operation of the boiler is hindered. Further, in the vicinity of the burner, the temperature in the vicinity of the furnace wall becomes high due to the radiant heat of the pulverized coal combustion flame, so that ash tends to melt and adhere to a relatively low temperature heat transfer tube, and the heat recovery rate of the furnace tends to decrease.

Therefore, a method of operating a boiler that represents the possibility of occurrence of ash adhesion as an index and suppresses ash adhesion based on the index has been proposed (Japanese Patent No. 5342355). In this conventional operation method, focusing on slag, which is a component adhering to the furnace wall and heat transfer tube group, based on the slag ratio calculated for each solid fuel and the composition of the ash component, the mixing ratio of multiple types of solid fuel Is determined. Specifically, in the conventional boiler operation method, a reference value for the slag ratio is determined so that the ash adhesion rate is low, and the mixing ratio of a plurality of types of solid fuels is set so that the slag ratio is less than this reference value. By determining, adhesion of ash is suppressed.

However, in the above conventional boiler operation method, the heat recovery rate of the furnace may be lowered even though the adhesion of ash is suppressed. Therefore, a new boiler operation method that can suppress a decrease in the heat recovery rate of the furnace is desired.

Japanese Patent No. 5342355

This invention is made | formed based on the above situations, and makes it a subject to provide the operating method and boiler equipment of a boiler which can suppress the fall of the heat recovery rate of a furnace.

The present inventors pay attention to the fact that the degree of decrease in the heat recovery rate varies depending on the solid fuel even if the mass of ash adhering to the heat transfer tube is the same, and the relationship between the solid fuel and the degree of decrease in the heat recovery rate As a result of intensive research by conducting detailed analysis, it was confirmed that the larger the specific surface area of solid fuel ashed, the more porous ash adhered to the heat transfer tube and the lower the heat recovery rate. did. And based on this knowledge, the present inventors determined the mixing ratio of multiple types of solid fuels so that the specific surface area after ashing is below the reference value, thereby suppressing the decrease in the furnace heat recovery rate. As a result, it was found that the boiler can be operated stably and the present invention was completed.

The invention made in order to solve the above-mentioned problems is a boiler operating method in which a plurality of types of solid fuels are mixed and burned, and the ash content in the plurality of types of solid fuels and the plurality of types of solid fuels A plurality of types of solid fuels based on the step of acquiring the specific surface area after ashing, the ash content of each of the plurality of types of solid fuel obtained in the acquisition step and the specific surface area after ashing And a step of determining a mixing ratio of the plurality of types of solid fuels so that a specific surface area after ashing of the whole mixture becomes equal to or less than a reference value.

The operation method of the boiler includes the step of acquiring the ash content in the plurality of types of solid fuels and the specific surface area after the ashing of the plurality of types of solid fuels, and the plurality of types of the plurality of types obtained in the acquisition step. Based on the ash content of each solid fuel and the specific surface area after ashing, the plurality of types of solid fuels so that the specific surface area after ashing of the mixture of the plurality of types of solid fuels is below the reference value. Therefore, the specific surface area of the ash generated by the combustion of the solid fuel can be reduced to a certain value or less, and the adhesion of the porous ash to the heat transfer tube can be suppressed. Thereby, since the heat insulation of adhesion ash is reduced, the operation method of the said boiler can suppress the fall of a furnace heat recovery rate.

The reference value is preferably 5.5 m ² / g. Thus, the fall of a furnace heat recovery rate can be suppressed more reliably by making the said reference value into 5.5 m < ² > / g.

The solid fuel may be coal. In boilers using coal as solid fuel, the furnace heat recovery rate tends to decrease. For this reason, the operating method of the said boiler which can suppress the fall of a furnace heat recovery rate can be used suitably.

The operation method of the boiler may be used for a thermal power plant. Thus, by using the operation method of the boiler for a thermal power plant, it is possible to stably supply power while suppressing a decrease in the furnace heat recovery rate.

Another invention made to solve the above problems is a boiler facility for mixing and burning a plurality of types of solid fuels, each of which includes a plurality of mechanisms for supplying different types of the solid fuels, and A mechanism for mixing a plurality of types of solid fuel supplied from the supply mechanism, a mechanism for pulverizing the solid fuel mixed by the mixing mechanism, a boiler for burning the solid fuel pulverized by the pulverization mechanism, and the plurality of Based on the ash content of each type of solid fuel and the specific surface area after ashing of the plurality of types of solid fuel, the specific surface area after ashing of the mixture of the plurality of types of solid fuel is below the reference value. A mechanism for determining the mixing ratio of the plurality of types of solid fuels, and the mixing mechanism that is introduced from the supply mechanism to the mixing mechanism so as to have a mixing ratio of the plurality of types of solid fuels determined by the determination mechanism A boiler equipment, characterized in that it comprises a mechanism for adjusting the supply amount of each several solid fuel.

The boiler facility includes a mechanism for determining the mixing ratio of the plurality of types of solid fuel so that the specific surface area after ashing of the whole mixture of the plurality of types of solid fuel is equal to or less than a reference value. Can be suppressed. Thereby, since the heat insulation of adhesion ash is reduced, the said boiler installation can suppress the fall of a furnace heat recovery rate.

Here, the “ash content” is a value measured according to JIS-M8812 (2006). The “specific surface area” is a value measured according to JIS-Z8830 (2013).

As described above, the boiler operating method and the boiler equipment of the present invention can suppress a decrease in the furnace heat recovery rate.

It is a key map showing boiler equipment of one embodiment of the present invention. It is a flowchart which shows the procedure of the operating method of the boiler of one Embodiment of this invention. It is a graph which shows the relationship between the specific surface area after ashing of a solid fuel, and a furnace heat recovery rate.

Hereinafter, an embodiment of a boiler operating method and boiler equipment according to the present invention will be described using a thermal power plant.

The thermal power plant is equipped with the boiler equipment, steam turbine generator equipment and condensate water supply equipment.

<Boiler equipment>
The boiler facility shown in FIG. 1 is a boiler facility that mixes and burns a plurality of types of solid fuels. The boiler equipment includes a hopper 1, a mixer 2, a pulverizer 3, a boiler 4, a calculator 5, and a supply amount adjusting device 6.

(hopper)
The hopper 1 is a mechanism that supplies solid fuel. The boiler facility includes a plurality of hoppers 1 for supplying different types of solid fuel to supply a plurality of types of solid fuel. Although FIG. 1 shows a case where two hoppers 1 are provided, three or more kinds of solid fuels may be used. In that case, the boiler equipment includes the same number of hoppers 1 as the type of solid fuel.

The hopper 1 has a storage tank for storing the solid fuel, and the solid fuel can be dropped and taken out from a bottom-open funnel-shaped mouth at the bottom of the storage tank.

(Mixer)
The mixer 2 is a mechanism for mixing the solid fuel supplied from the hopper 1. As the mixer 2, for example, a known drum mixer or the like can be used.

(Crusher)
The pulverizer 3 is a mechanism for pulverizing the solid fuel mixed in the mixer 2. As the pulverizer 3, a known vertical roller mill or the like can be used.

The particle size of the solid fuel after pulverization is not particularly limited, and for example, the solid fuel can be pulverized so that the proportion of the solid fuel having a particle size of 75 μm or less is 75% by mass or more and 90% by mass or less.

(boiler)
The boiler 4 burns the solid fuel pulverized by the pulverizer 3. The boiler 4 mainly includes a burner 7, a furnace, a heat transfer tube, and a chimney. The boiler 4 burns solid fuel blown together with air in a furnace by means of a burner 7, and performs heat exchange using a large number of heat transfer tubes arranged in the vertical direction in the furnace. By this heat exchange, water supplied to the heat transfer tube is heated and pressurized to generate steam. Moreover, the combustion gas generated by the combustion is discharged from the chimney.

The heat transfer tube is appropriately configured according to the required steam temperature and pressure, for example, a lower heater including a primary heater, a primary reheater, and a economizer disposed in the lower part of the furnace, It can comprise with the upper heat-transfer part provided with the secondary heater, the tertiary heater, the final heater, and the secondary reheater which are arrange | positioned at the furnace upper part. The lower heat transfer section mainly preheats the feed water supplied to the boiler 4, and the upper heat transfer section mainly generates high-temperature and high-pressure steam. In addition, the reheater reheats the steam that has worked in the steam turbine or the like, and creates steam that rotates the reheat cycle turbine. Further, the economizer preheats the feed water of the boiler 4 with the heat of the exhausted combustion gas.

(Calculator)
The calculator 5 is a mechanism that determines the mixing ratio of the above-described plural types of solid fuels. Specifically, based on the ash content of each of the plurality of types of solid fuels and the specific surface area after the ashing of the plurality of types of solid fuels (hereinafter simply referred to as specific surface area), the plurality of types of solid fuels The mixing ratio of the plurality of types of solid fuels is determined so that the specific surface area after ashing in the ash content of the entire fuel mixture is below a reference value.

The computing unit 5 calculates a mixing ratio of a plurality of types of solid fuels by a mixing ratio determining step (S2) of a boiler operation method described later. In addition, the calculator 5 controls the supply amount adjusting device 6 based on the calculated mixing ratio.

(Supply amount adjustment device)
The supply amount adjusting device 6 adjusts the supply amount of each of the plurality of types of solid fuel introduced from the hopper 1 to the mixer 2 so that the mixing ratio of the plurality of types of solid fuel determined by the calculator 5 is obtained. It is a mechanism to do. That is, the boiler equipment includes a supply amount adjusting device 6 having the same number as the type of solid fuel, one for each pipe connected to the mixer 2 from each of the same number of hoppers 1 as the type of solid fuel. The supply amount adjusting device 6 is not particularly limited, and for example, a chain conveyor that conveys solid fuel from the hopper 1 to the mixer 2 can be used. In this case, the supply amount is adjusted by adjusting the moving speed of the conveyor.

<How to operate the boiler>
FIG. 2 shows a procedure of a boiler operating method using the boiler apparatus. The boiler operation method is a boiler operation method in which a plurality of types of solid fuels are mixed and burned. The operation method of the boiler is obtained by the step of acquiring the ash content in the plurality of types of solid fuel and the specific surface area after ashing of the plurality of types of solid fuel (S1: acquisition step), and the acquisition step. Based on the ash content and the specific surface area of each of the plurality of types of solid fuel obtained, the plurality of types of the plurality of types of solid fuels so that the specific surface area in the ash content of the mixture of the plurality of types of solid fuels is below a reference value A step of determining the mixing ratio of the solid fuel (S2: mixing ratio determining step), and a step of mixing the plurality of types of solid fuels and supplying them to the furnace based on the determined mixing ratio (S3: mixing supply step) With.

The solid fuel used in the operation method of the boiler is not particularly limited as long as it is a fuel used in the boiler, and examples thereof include coal, sludge carbide, and biomass fuel. Among them, coal that generates a large amount of heat and is preferably used in a thermal power plant or the like is preferable.

The type of coal is not particularly limited. In the operation method of the boiler, since the mixing ratio of the plurality of types of solid fuels is determined so that the specific surface area is equal to or less than a reference value, it is possible to suppress a decrease in furnace heat recovery rate caused by adhesion of porous ash. In other words, the boiler operating method uses a solid fuel having a relatively large specific surface area that is likely to lower the furnace heat recovery rate and a solid fuel that has a relatively small specific surface area and is difficult to reduce the furnace heat recovery rate. Moreover, the fall of the furnace heat recovery rate can be suppressed.

Therefore, in the operation method of the boiler, coal having a relatively large specific surface area can be used as a part of the solid fuel. Examples of the coal having a relatively large specific surface area include anthracite coal, bituminous coal, subbituminous coal, lignite, high silica coal, and high calcium coal.

(Acquisition process)
In the acquisition step (S1), the ash content of each of the plurality of types of solid fuels and the specific surface area after ashing of the plurality of types of solid fuels are acquired. The acquisition of the ash content and the specific surface area after ashing in this acquisition step does not necessarily require analysis of solid fuel, but the ash content and the specific surface area after ashing measured in advance. May be entered from a storage device or the like or input by an operator.

The method for measuring the ash content of each solid fuel is not particularly limited, and for example, a measuring method based on JIS-M8812 (2006) can be used. The ash content may be the same base value as the mixing ratio described later, and may be an anhydrous base or a water-containing base, but is preferably an anhydrous base that facilitates calculation of the mixing ratio.

In addition, as a method for measuring the specific surface area, a BET method based on JIS-Z8830 (2013) can be used with a solid fuel ashed in an electric furnace or the like as a sample. In order to reduce the measurement error, it is preferable to use a solid fuel used for measurement having a particle size distribution substantially equal to that when used as a fuel (at the time of combustion). Therefore, when pulverizing after mixing a plurality of types of solid fuels, it is preferable to measure the specific surface area by ashing the same pulverized solid fuel.

In addition, in the acquisition step (S1), in addition to the measurement of the ash content, it is preferable to acquire a measurement value of the calorific value of each solid fuel. By obtaining the calorific value of each solid fuel in this way, in the mixing and supplying step (S3) to be described later, the solid fuel is supplied so that the heat amount of the mixed solid fuel charged into the boiler becomes a desired amount. Since the amount is easy to adjust, the boiler can be operated efficiently. Here, the calorific value of the solid fuel is a value measured by burning the solid fuel in accordance with, for example, a measurement method based on JIS-M8814 (2003).

Further, it is preferable that the ash content of each solid fuel, the specific surface area, the calorific value of the solid fuel, and the like are recorded and stored as data in, for example, a storage device. By storing the data in this way, the data can be used thereafter.

(Mixing ratio determination process)
In the mixing ratio determination step (S2), based on the ash content and the specific surface area of each of the plurality of types of solid fuel obtained in the acquisition step, A mixing ratio of the plurality of types of solid fuels is determined so that the specific surface area is equal to or less than a reference value. This step is performed by the calculator 5 of the boiler facility.

When the mass content of ash in each solid fuel is Wi, the specific surface area after ashing of each solid fuel is Si, and the mass ratio of each solid fuel to the whole mixture is Xi, the ratio after ashing of the whole mixture The surface area S can be calculated by the following formula (1). In addition, the unit of the said ash content rate Wi, specific surface area Si, and mass ratio Xi should just be unified between fuels, and as shown to following formula (1), the unit of the specific surface area S of the whole mixture is each The unit is the same as the specific surface area Si of the solid fuel.

In the mixing ratio determining step (S2), the mixing ratio of the plurality of types of solid fuels is determined so that the specific surface area S is not more than a reference value. The operation method of the boiler can suppress a decrease in the furnace heat recovery rate by setting the specific surface area S to a reference value or less.

The specific surface area S is a measure of the porosity of ash generated by the combustion of solid fuel. Porous ash with a high porosity is considered to adhere to the heat transfer tube of the boiler, thereby inhibiting heat transfer and lowering the furnace heat recovery rate. For this reason, if the specific surface area S is set to a reference value or less, the porosity of the attached ash is reduced and the heat insulation is reduced, so that it is considered that the reduction in the furnace heat recovery rate can be suppressed.

The reference value of the specific surface area S of the solid fuel described above CCS, the imported coal is blended, preferably 5.5 m ² / g, more preferably 5.0 m ² / g, more preferably ^{^{4.7m 2 / g, 4.5m 2 /}} g Is particularly preferred. When making the said reference value larger than the said value, since a furnace heat-recovery rate falls too much, there exists a possibility that the fall of a furnace heat-recovery rate cannot fully be suppressed.

Meanwhile, the lower limit of the specific surface area S of the solid fuel described above CCS, the imported coal is blended, preferably 2.5 m ² / g, more preferably ^{^{2.8m 2 / g, 3.0m 2 /}} g is more preferred. When the specific surface area S is less than the above lower limit, the solid fuel that can be used is limited, so that the fuel cost may increase unnecessarily.

(Mixed supply process)
In the mixing and supplying step (S3), the plurality of types of solid fuels are mixed and pulverized based on the mixing rate determined in the mixing rate determining step (S2), and then supplied to the furnace. Specifically, the supply amount adjusting device 6 is controlled by the calculator 5 of the boiler facility to adjust the amount of solid fuel sent from the hopper 1 to the mixer 2. The mixed solid fuel is pulverized by the pulverizer 3 and then blown into the boiler 4 together with air to be burned.

(advantage)
Since the operation method of the boiler determines the mixing ratio of a plurality of types of solid fuel so that the specific surface area S is not more than a reference value, the heat insulation property of the ash adhering to the heat transfer tube is reduced. A decrease in rate can be suppressed.

<Steam turbine generator equipment>
The steam turbine generator facility mainly includes a steam turbine and a generator.

The steam turbine is an external combustion engine that converts steam energy into rotational motion via a turbine (impeller) and a shaft, and is driven by steam generated by the boiler equipment.

The steam turbine is not particularly limited, and can be constituted by, for example, a high-temperature high-pressure turbine, a high-temperature reheat turbine, and a low-pressure turbine. In this case, the steam generated in the boiler facility first drives the high temperature and high pressure turbine. By driving the high-temperature high-pressure turbine, the steam that has lost its energy and dropped in temperature and pressure is heated again by the reheater of the boiler equipment. The high-temperature reheat turbine is driven by the high-temperature steam heated by the reheater. Further, the steam whose temperature and pressure have been lost due to the driving of the high-temperature reheat turbine is guided to the condensate water supply facility after driving the low-pressure turbine.

The power of the high-temperature high-pressure turbine, high-temperature reheat turbine, and low-pressure turbine driven by this steam drives the generator to obtain electrical output.

<Condensate water supply equipment>
The condensate water supply facility mainly includes a condenser, a pump, a heater, and a deaerator.

Condensate water supply equipment cools the steam that drives the steam turbine with a condenser and collects it as condensate. This condensate is pressurized by a pump, heated by a heater, and deaerated by a deaerator. The pressurized and heated condensate is supplied to the economizer of the boiler facility as water supply for the boiler facility.

<Advantages>
Since the thermal power plant using the boiler equipment uses the operation method of the boiler, the furnace heat recovery rate is unlikely to decrease. For this reason, the thermal power plant using the boiler equipment is easy to operate stably.

[Other Embodiments]
The said embodiment does not limit the structure of this invention. Therefore, in the above-described embodiment, the components of each part of the above-described embodiment can be omitted, replaced, or added based on the description and common general knowledge of the present specification, and they are all interpreted as belonging to the scope of the present invention. Should.

The boiler equipment and the operation method of the boiler equipment may be applied to boiler equipment used other than the thermal power plant.

Further, in the boiler facility, the configuration of the boiler may be different from that in the above embodiment.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Solid fuel)
First, three types of coal were prepared as solid fuels, and a small amount of each was sampled to measure the content of ash and the specific surface area after ashing in the ash. The ash content of coal was measured by a measuring method based on JIS-M8812 (2006), and the water content value was calculated. The specific surface area was measured according to JIS-Z8830 (2013). The results are shown in Table 1.

(No. 1 to No. 7)
Next, among these three types of coal, two or three types of coal were used. 1-No. The mixing ratio (water-containing base) of coal No. 7 was selected, and the specific surface area after ashing was calculated. In addition, using a coal mixture in which coal is mixed so as to have the mixing ratio shown in Table 2, a thermal boiler of a thermal power plant with a power generation capacity of 700 MW was operated for a certain period, and the average value of the furnace heat recovery rate within that period was obtained. . The results are shown in Table 2.

In Table 2, the furnace heat recovery rate is No. It is the value normalized in terms of the ratio of 1 to the furnace heat recovery rate.

Also, the results of Table 2 are shown in a graph in FIG. As shown in the figure, the specific surface area of ash and the furnace heat recovery rate are highly correlated regardless of the type of coal to be mixed, and it can be seen that the decrease in the furnace heat recovery rate can be suppressed by setting the specific surface area to a reference value or less.

Moreover, No. whose specific surface area in ash is 5.5 m < ² > / g or less. 1-No. No. 6 has a furnace heat recovery rate exceeding 0.95, while a specific surface area of No. 6 exceeding 5.5 m ² / g. In 7, the furnace heat recovery rate is less than 0.95. From this, it is understood that a high furnace heat recovery rate of 0.95 or more can be obtained by setting the reference value of the specific surface area to 5.5 m ² / g.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application filed on April 19, 2016 (Japanese Patent Application No. 2016-083884), the contents of which are incorporated herein by reference.

As described above, the boiler operating method of the present invention can suppress a decrease in the furnace heat recovery rate. Therefore, the boiler equipment using the boiler operating method is easy to operate stably. Moreover, the boiler using the operating method of the said boiler is used suitably for a thermal power plant.

DESCRIPTION OF SYMBOLS 1 Hopper 2 Mixer 3 Crusher 4 Boiler 5 Calculator 6 Supply amount adjusting device 7 Burner S1 Acquisition process S2 Mixing ratio determination process S3 Mixing supply process

Claims

A method of operating a boiler that mixes and burns multiple types of solid fuel,
Obtaining the ash content in the plurality of types of solid fuels and the specific surface area after the ashing of the plurality of types of solid fuels;
Based on the ash content of each of the plurality of types of solid fuel obtained in the acquisition step and the specific surface area after the ashing, the specific surface area after ashing of the whole mixture of the plurality of types of solid fuel is a standard And a step of determining a mixing ratio of the plurality of types of solid fuels so as to be equal to or lower than a value.
The boiler operating method according to claim 1, wherein the reference value is 5.5 m 2 / g.
3. The boiler operating method according to claim 1 or 2, wherein the solid fuel is coal.
The boiler operating method according to claim 1, which is used in a thermal power plant.
A boiler facility that mixes and burns multiple types of solid fuel,
A plurality of mechanisms for supplying different types of the above solid fuels;
A mechanism for mixing a plurality of types of solid fuel supplied from the plurality of supply mechanisms;
A mechanism for pulverizing the solid fuel mixed by the mixing mechanism;
A boiler for burning the solid fuel pulverized by the pulverization mechanism;
Based on the ash content of each of the plurality of types of solid fuels and the specific surface area of the plurality of types of solid fuels after ashing, the specific surface area of the mixture of the plurality of types of solid fuels after ashing is below a reference value A mechanism for determining the mixing ratio of the plurality of types of solid fuels to be
A mechanism for adjusting the supply amount of each of the plurality of types of solid fuel introduced from the supply mechanism to the mixing mechanism so as to obtain a mixing ratio of the plurality of types of solid fuel determined by the determination mechanism. Boiler equipment.