CN108884991B - Method for operating boiler and boiler plant - Google Patents
Method for operating boiler and boiler plant Download PDFInfo
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- CN108884991B CN108884991B CN201780023130.9A CN201780023130A CN108884991B CN 108884991 B CN108884991 B CN 108884991B CN 201780023130 A CN201780023130 A CN 201780023130A CN 108884991 B CN108884991 B CN 108884991B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Feeding And Controlling Fuel (AREA)
- Combustion Of Fluid Fuel (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The method comprises the following steps: a step for obtaining the ash content in the plurality of solid fuels and the specific surface areas of the plurality of solid fuels after ashing; and a step of determining the mixing ratio of the plurality of solid fuels by setting the specific surface area after ashing of the whole mixture of the plurality of solid fuels to a standard value or less based on the ash content and the specific surface area after ashing of each of the plurality of solid fuels obtained in the obtaining step.
Description
Technical Field
The present invention relates to a method of operating a boiler and a boiler plant.
Background
For example, a boiler for burning a solid fuel such as coal generally includes a furnace for burning the solid fuel by a burner or the like, and a plurality of heat transfer tubes arranged in the furnace in the vertical direction for heat exchange. In a boiler used in a thermal power plant or the like, for example, the heat transfer pipe has a lower heat transfer portion that exchanges heat among a primary heater, a primary reheater, and an economizer arranged in a lower portion of a furnace; and an upper heat transfer part for performing heat exchange among the secondary heater, the tertiary heater, the final heater and the secondary reheater arranged at the upper part of the furnace.
Among such boilers, for example, in a pulverized coal boiler using coal as a solid fuel, ash in combustion gas generated by combustion of coal adheres to a furnace wall and a heat transfer pipe of the furnace and accumulates, and slag formation and fouling occur, and an ash adhesion layer may be formed. When such ash adhesion occurs, the heat storage rate of the heat transfer surface of the heat transfer pipe tends to be greatly reduced. Further, when ash (ash slag) attached to the furnace wall is excessively increased, the ash may fall from the furnace wall or the like, resulting in a large fluctuation in the furnace pressure, damage to the heat transfer pipe, and blockage of the gas flow path.
In particular, since the upper heat transfer portion includes combustion gas that flows between the heat transfer tubes arranged at a narrower interval than the lower heat transfer portion to perform heat exchange, if ash adheres to the upper heat transfer portion, a large variation in the furnace internal pressure and clogging of the gas flow path are likely to occur, and stable operation of the boiler is hindered. In addition, in the vicinity of the burner, the temperature in the vicinity of the furnace wall is increased by the radiant heat of the combustion flame of the pulverized coal, so that ash is likely to melt and adhere to the heat transfer pipe at a relatively low temperature, and the heat storage rate of the furnace is likely to be lowered.
Therefore, an operation method of a boiler has been proposed in which the possibility of the occurrence of ash deposition is indicated as an index, and ash deposition is suppressed based on the index (japanese patent No. 5342355). In this conventional operation method, slag, which is a component adhering to the furnace wall and the heat transfer tube group, is focused, and the mixing ratio of the plurality of solid fuels is determined based on the slag ratio and the ash component composition calculated for each solid fuel. Specifically, in the conventional boiler operation method, a standard value of the slag ratio is determined so that the ash deposition rate is low, and the slag ratio is made equal to or less than the standard value to determine the mixing ratio of the plurality of types of solid fuels, thereby suppressing the deposition of ash.
However, in the above conventional boiler operation method, although adhesion of ash is suppressed, the heat storage rate of the furnace may be decreased. Therefore, a new boiler operation method capable of suppressing a decrease in the heat storage rate of the furnace is desired.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 5342355 publication
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide a boiler operation method and a boiler plant that can suppress a decrease in the heat storage rate of a furnace.
The present inventors have focused on that, even if the mass of ash adhering to the heat transfer pipe is the same, the degree of reduction in the heat storage rate varies depending on the solid fuel, and as a result of detailed analysis of the relationship between the solid fuel and the degree of reduction in the heat storage rate, it was confirmed that as the specific surface area at the time of ashing of the solid fuel is increased, the more porous ash adheres to the heat transfer pipe, the more the reduction in the heat storage rate is increased. Based on this knowledge, the present inventors have found that the mixing ratio of a plurality of solid fuels is determined so that the specific surface area after ashing is equal to or less than a standard value, and thereby the decrease in the heat storage rate of the furnace can be suppressed and the stable operation of the boiler can be facilitated, and have completed the present invention.
The present invention made to solve the above problems is a method for operating a boiler, in which a plurality of solid fuels are mixed and burned, the method comprising: a step of obtaining the ash content in the plurality of solid fuels and the specific surface areas of the plurality of solid fuels after ashing; and a step of determining the mixing ratio of the plurality of types of solid fuels based on the ash content and the specific surface area after ashing of each of the plurality of types of solid fuels obtained in the obtaining step, such that the specific surface area after ashing of the entire mixture of the plurality of types of solid fuels is equal to or less than a standard value.
The method for operating a boiler includes a step of acquiring the content of ash in the plurality of types of solid fuels and the specific surface areas of the plurality of types of solid fuels after ashing, and a step of determining the mixing ratio of the plurality of types of solid fuels based on the content of ash and the specific surface areas of the plurality of types of solid fuels obtained in the acquisition step, such that the specific surface area of the plurality of types of solid fuels after ashing as a whole is equal to or less than a standard value, and therefore, the specific surface area of ash generated by combustion of the solid fuels can be reduced to a certain value or less, and adhesion of porous ash to the heat transfer pipe can be suppressed. Thus, in the method for operating a boiler, the heat insulating property of the adhering ash is reduced, and therefore, the reduction of the furnace heat storage rate can be suppressed.
The standard value is preferably 5.5m2(ii) in terms of/g. Thus, by makingThe standard value is 5.5m2(iv)/g, the decrease in the heat storage rate of the furnace can be more surely suppressed.
The solid fuel may be coal. In a boiler using coal as a solid fuel, a reduction in the heat storage rate of the furnace is particularly likely to occur. Therefore, the method of operating the boiler, which can suppress a decrease in the heat storage rate of the furnace, is suitably used.
The operation method of the boiler can be used for a thermal power plant. By using this boiler operation method in a thermal power plant in this manner, it is possible to stably supply electric power while suppressing a decrease in furnace heat storage rate.
Another invention made to solve the above problems is a boiler plant in which a plurality of solid fuels are mixed and burned, the boiler plant comprising: a plurality of mechanisms for supplying the solid fuels of different types, respectively; a mechanism for mixing the plurality of types of solid fuels 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 crushed by the crushing mechanism; means for determining a mixing ratio of the plurality of solid fuels based on a content of ash in each of the plurality of solid fuels and a specific surface area of the plurality of solid fuels after ashing such that the specific surface area of the plurality of solid fuels after ashing is a standard value or less; and a mechanism for adjusting the respective supply amounts of the plurality of types of solid fuels introduced from the supply mechanism into the mixing mechanism so as to achieve the mixing ratio of the plurality of types of solid fuels determined by the determination mechanism.
The boiler equipment is provided with a mechanism for determining the mixing ratio of the plurality of solid fuels in such a manner that the specific surface area after ashing of the whole mixture of the plurality of solid fuels is equal to or less than a standard value, so that the adhesion of porous ash can be suppressed. This reduces the heat insulation of the adhering ash, and thus the heat storage rate of the furnace can be prevented from decreasing by the boiler facility.
The "ash content" is a value measured according to JIS-M8812 (2006). The "specific surface area" is a value measured in accordance with JIS Z8830 (2013).
As described above, the method for operating a boiler and the boiler plant according to the present invention can suppress a decrease in the heat storage rate of the furnace.
Drawings
Fig. 1 is a conceptual diagram illustrating a boiler plant according to an embodiment of the present invention.
Fig. 2 is a flowchart showing steps of a method for operating a boiler according to an embodiment of the present invention.
Fig. 3 is a graph showing a relationship between the specific surface area of the solid fuel after ashing and the heat storage rate of the furnace.
Detailed Description
Hereinafter, an embodiment of the boiler operation method and the boiler plant according to the present invention will be described with reference to a thermal power plant.
The thermal power plant includes the boiler facility, the steam turbine generator facility, and the condensate water supply facility.
< boiler plant >
The boiler plant shown in fig. 1 is a boiler plant in which a plurality of solid fuels are mixed and burned. The boiler facility includes a hopper 1, a mixer 2, a pulverizer 3, a boiler 4, a calculator 5, and a supply amount adjusting device 6.
(feed hopper)
The feed hopper 1 is a mechanism for supplying solid fuel. The boiler facility includes a plurality of hoppers 1 for supplying solid fuels of different types to supply a plurality of types of solid fuels. In fig. 1, 2 hoppers 1 are provided, but three or more types of solid fuels may be used. In this case the boiler plant is provided with the same number of feed hoppers 1 as the type of solid fuel.
The hopper 1 has a tank for storing the solid fuel, and the solid fuel can be dropped and taken out from a funnel-shaped opening with an open bottom located at the bottom of the tank.
(mixing machines)
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.
(crushing machine)
The pulverizer 3 is a mechanism that pulverizes the solid fuel mixed by the mixer 2. As the crusher 3, a known vertical roll mill or the like can be used.
The particle size of the pulverized solid fuel is not particularly limited, and for example, the pulverized solid fuel can be pulverized so that the proportion of the solid fuel having a particle size of 75 μm or less is 75 mass% or more and 90 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 pipe, and a flue. The boiler 4 burns the solid fuel injected together with the air in the furnace by the burner 7, and performs heat exchange by the heat transfer tubes arranged in the furnace in a large number in the vertical direction. The feed water supplied to the heat transfer pipe by this heat exchange is heated and pressurized to generate steam. In addition, combustion gas generated by the combustion is discharged from the flue pipe.
The heat transfer pipe is suitably configured according to the required temperature and pressure of the steam, and may be configured, for example, as follows: a lower heat transfer part provided at a lower part of the furnace and having a primary heater, a primary reheater and an economizer; an upper heat transfer part arranged on the upper part of the furnace and provided with a secondary heater, a tertiary heater, a final heater and a secondary reheater. The lower heat transfer portion mainly preheats feed water supplied to the boiler 4, and the upper heat transfer portion mainly generates high-temperature and high-pressure steam. In addition, the reheater reheats the steam that has been operated by a steam turbine or the like to produce steam that rotates a reheat cycle turbine. The economizer preheats the feed water of the boiler 4 with the heat of the discharged combustion gas.
(arithmetic machine)
The arithmetic unit 5 is a mechanism for determining the mixing ratio of the plurality of solid fuels. Specifically, the mixing ratio of the plurality of solid fuels is determined by setting the specific surface area after ashing in the ash of the entire mixture of the plurality of solid fuels to a standard value or less based on the content ratio of the ash of each of the plurality of solid fuels and the specific surface area after ashing (hereinafter simply referred to as specific surface area) of the plurality of solid fuels.
The arithmetic unit 5 calculates the mixing ratio of the plurality of solid fuels in a mixing ratio determining step (S2) of a boiler operation method described later. The arithmetic unit 5 controls the supply amount adjusting device 6 based on the calculated mixture ratio.
(supply amount adjusting device)
The supply amount adjusting device 6 is a mechanism for adjusting the supply amount of each of the plurality of types of solid fuels introduced from the feed hopper 1 into the mixer 2 so as to achieve the mixing ratio of the plurality of types of solid fuels determined by the arithmetic unit 5. That is, the boiler plant includes 1 supply amount adjusting device 6 in total having the same number as the type of the solid fuel, and 1 pipe connected to the mixer 2 from each of the feed hoppers 1 having the same number as the type of the solid fuel. The supply amount adjusting device 6 is not particularly limited, and for example, a chain conveyor that conveys the 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.
< method for operating boiler >
Fig. 2 shows the steps of the method for operating a boiler using the boiler device. The method for operating the boiler is a method for operating a boiler in which a plurality of solid fuels are mixed and burned. The method for operating a boiler comprises: a step (S1: obtaining step) for obtaining the ash content in the plurality of solid fuels and the specific surface areas of the plurality of solid fuels after the ashing; a step (S2: mixing ratio determination step) of determining the mixing ratio of the plurality of types of solid fuels based on the content ratio of the ash and the specific surface area of each of the plurality of types of solid fuels obtained in the obtaining step, such that the specific surface area in the ash of the entire mixture of the plurality of types of solid fuels is equal to or less than a standard value; and a step (S3: mixed supply step) of mixing the plurality of types of solid fuels and supplying the mixed solid fuels to the furnace based on the determined mixing ratio.
The solid fuel used in the method of operating the boiler is not particularly limited if it is a fuel used in the boiler, and examples thereof include coal, sludge carbide, and biofuel. Among them, coal having a large heat release amount and suitable for use in a thermal power plant or the like is preferable.
The kind of the coal is not particularly limited. In this method for operating a 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 standard value, it is possible to suppress a decrease in the furnace heat storage rate caused by the adhesion of porous ash. In short, in this method of operating a boiler, since the solid fuel having a relatively large specific surface area and being liable to lower the furnace heat storage rate is mixed with the solid fuel having a relatively small specific surface area and being difficult to lower the furnace heat storage rate, the lowering of the furnace heat storage rate can be suppressed.
Therefore, in this method for operating a boiler, coal or the like having a relatively large specific surface area can be used as a part of the solid fuel. Examples of the coal having such a relatively large specific surface area include anthracite, bituminous coal, subbituminous coal, lignite, high-silica coal, and high-calcium coal.
(obtaining step)
In the acquisition step (S1), the ash content of each of the plurality of solid fuels and the specific surface area of the plurality of solid fuels after ashing are acquired. In the obtaining step, the content of the ash and the specific surface area after the ashing are obtained, and the content of the ash and the specific surface area after the ashing which are measured in advance may be input from a reference such as a storage device or an operator without necessarily analyzing the solid fuel.
The method for measuring the ash content of each solid fuel is not particularly limited, and for example, a method in accordance with JIS-M8812 (2006) can be used. The ash content may be the same as the mixing ratio described later, and may be dry or wet, but is preferably dry, which facilitates calculation of the mixing ratio.
As a method for measuring the specific surface area, a solid fuel may be ashed by, for example, an electric furnace and measured as a sample by a BET method according to JIS-Z8830 (2013). In order to reduce the measurement error, the solid fuel used for the measurement is preferably a fuel having a particle size distribution substantially equal to that when used as a fuel (when burned). Therefore, when a plurality of solid fuels are mixed and pulverized, it is preferable to ash each of the similarly pulverized solid fuels to measure the specific surface area.
In the acquisition step (S1), in addition to the measurement of the ash, the measurement values of the respective heat release amounts of the solid fuels may be acquired in advance. In this way, the respective heat release amounts of the solid fuels are obtained in advance, and in the mixing and feeding step (S3) described later, the amount of heat of the mixed solid fuel to be fed into the boiler can be easily adjusted to a desired amount to adjust the amount of solid fuel to be fed, so that the boiler can be operated efficiently. The heat release amount of the solid fuel is a value measured by burning the solid fuel in accordance with a measurement method according to JIS-M8814 (2003), for example.
The ash content of each solid fuel, the specific surface area, the heat release amount of the solid fuel, and the like are preferably stored in advance as data in a storage device or the like, for example. The data is held in advance in this manner, and can be used later.
(mixing ratio determining step)
In the mixing ratio determining step (S2), the mixing ratio of the plurality of types of solid fuels is determined based on the content ratio of the ash in each of the plurality of types of solid fuels obtained in the obtaining step and the specific surface area such that the specific surface area in the ash of the entire mixture of the plurality of types of solid fuels is equal to or less than a standard value. This step is performed by the arithmetic unit 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 total mixture is Xi, the specific surface area after ashing of the total mixture S can be calculated by the following formula (1). The units of the ash content Wi, the specific surface area Si, and the mass ratio Xi may be unified among the fuels, and the unit of the specific surface area S of the entire mixture is the same as the specific surface area Si of each solid fuel as shown in the following formula (1).
[ equation 1]
In the mixing ratio determining step (S2), the mixing ratio of the plurality of solid fuels is determined such that the specific surface area S is equal to or less than a standard value. In this method for operating a boiler, the specific surface area S is set to a standard value or less, thereby suppressing a decrease in the heat storage rate of the furnace.
The specific surface area S is a measure of the porosity of ash generated by combustion of the solid fuel. It is considered that porous ash having a large porosity adheres to a heat transfer pipe of a boiler to inhibit heat transfer, thereby lowering the furnace heat storage rate. Therefore, if the specific surface area S is set to a standard value or less, the porosity of the adhering ash becomes small, and the heat insulating property is lowered, so that it is considered that the reduction of the heat storage rate of the furnace can be suppressed.
The standard value of the specific surface area S of the solid fuel for coal blending is preferably 5.5m2A ratio of the total of the components is 5.0m2Per g, more preferably 4.7m2Per g, particularly preferably 4.5m2(ii) in terms of/g. When the standard value is larger than the above value, the furnace heat storage rate is excessively decreased, and therefore, the decrease in the furnace heat storage rate may not be sufficiently suppressed.
On the other hand, the lower limit of the specific surface area S of the solid fuel for coal blending is preferably 2.5m2A/g, more preferably 2.8m2(ii) g, more preferably 3.0m2(ii) in terms of/g. When the specific surface area S is lower than the lower limit, the usable solid fuel is limited, and therefore the fuel cost may be unnecessarily increased.
(Mixed supply step)
In the mixing and supplying step (S3), the plurality of types of solid fuels are mixed based on the mixing ratio determined in the mixing ratio determining step (S2), pulverized, and supplied to the furnace. Specifically, the feeding amount adjusting device 6 is controlled by the arithmetic unit 5 of the boiler facility, and the amounts of the solid fuels fed from the hopper 1 to the mixer 2 are adjusted. The mixed solid fuel is pulverized by the pulverizer 3, and then charged into the boiler 4 together with air and burned.
(advantages)
In this method for operating a boiler, since the mixing ratio of the plurality of types of solid fuels is determined so that the specific surface area S is equal to or less than the standard value, the heat insulating property of the heat transfer pipe by the adhering ash is reduced, and therefore, the reduction in the heat storage rate of the furnace can be suppressed.
< steam turbine generator apparatus >
A steam turbine generator system mainly includes a steam turbine and a generator.
The steam turbine is an external combustion engine that converts the energy of the steam into rotational motion via a turbine (impeller) and a shaft, and is driven by the steam generated by the boiler plant.
The steam turbine is not particularly limited, and may be composed of, for example, a high-temperature high-pressure turbine, a high-temperature reheat turbine, and a low-pressure turbine. In this case, the steam generated by the boiler plant first drives the high-temperature high-pressure turbine. The steam, which loses its energy and has a reduced temperature and pressure, is heated again by a reheater of the boiler plant by driving the high-temperature high-pressure turbine. The high-temperature reheat turbine is driven by the high-temperature steam heated by the reheater. Further, the steam, which loses its energy and has a reduced temperature and pressure 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 and high-pressure turbine, the high-temperature reheat turbine and the low-pressure turbine driven by the steam drives a generator to obtain electric output power.
< Water supply apparatus with condensed Water >
A water-condensing and water-supplying apparatus is mainly provided with a water condenser, a pump, a heater and a deaerator.
In a condensate water supply facility, steam for driving a steam turbine is cooled by a condenser and recovered as condensate water. The condensed water is pressurized by a pump, heated by a heater, and degassed by a degasifier. The pressurized and heated condensate water is supplied to an economizer of the boiler plant as feedwater for the boiler plant.
< advantage >
In a thermal power plant using the boiler facility, since the operation method of the boiler is used, the furnace heat storage rate is difficult to be reduced. Therefore, the thermal power plant using the boiler facility is easy to stably operate.
[ other embodiments ]
The above embodiments do not limit the configuration of the present invention. Therefore, the above-described embodiments may be omitted, replaced, or added with components of the respective portions of the above-described embodiments based on the description of the present specification and the common technical knowledge, and all of them should be interpreted as belonging to the scope of the present invention.
The boiler plant and the method for operating the boiler plant can be applied to boiler plants used in other than thermal power plants.
In this boiler facility, the structure of the boiler may be different from that of the above embodiment.
Examples
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
(solid Fuel)
First, three kinds of coals were prepared as solid fuels, and a small amount of each coal was sampled to measure the ash content and the specific surface area of the ash after ashing. The ash content of the coal was measured by a measurement method according to JIS-M8812 (2006), and the wet basis value was calculated. In addition, the specific surface area was measured in accordance with JIS-Z8830 (2013). The results are shown in table 1.
[ Table 1]
(No.1～No.7)
Next, the specific surface area after ashing was calculated by using two or three kinds of the three kinds of coals and selecting the mixing ratios (wet basis) of the coals No.1 to No.7 shown in Table 2. Further, using coal blend obtained by blending coal at the blending ratio shown in table 2, the average value of the furnace heat storage rate in a thermal power plant generating 700MW of power was determined using a thermal boiler for a fixed period. The results are shown in table 2.
[ Table 2]
In table 2, the furnace heat storage rate is a value normalized by conversion into a ratio to the furnace heat storage rate of No. 1.
In addition, the results of table 2 are graphically shown in fig. 3. As shown in the figure, the specific surface area of ash and the furnace heat storage rate are highly correlated regardless of the kind of coal to be mixed, and it is understood that the reduction in the furnace heat storage rate can be suppressed by setting the specific surface area to a standard value or less.
Further, the specific surface area in the ash was 5.5m2No.1 to No. 6/g, the heat storage rate of the furnace is higher than 0.95, and the specific surface area is higher than 5.5m2In No. 7/g, the heat storage rate of the furnace was less than 0.95. From this, it was found that the standard value of the specific surface area was set to 5.5m2(ii) a high furnace heat storage rate of 0.95 or more can be obtained.
The present invention has been described in detail and with reference to specific embodiments thereof, but it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
The present application is based on Japanese patent application 2016 (2016-.
Industrial applicability
As described above, the method for operating a boiler according to the present invention can suppress a decrease in the heat storage rate of the furnace. Therefore, the boiler plant using the method for operating a boiler can be stably operated easily. The boiler using the method for operating the boiler is suitably used in a thermal power plant.
Description of the symbols
1 feed hopper
2 mixing machine
3 disintegrating machine
4 boiler
5 arithmetic machine
6 supply amount adjusting device
7 burner
S1 obtaining Process
S2 mixing ratio determining step
S3 Mixed feed step
Claims (5)
1. A method for operating a boiler in which a plurality of types of solid fuels are mixed and burned, comprising:
a step of obtaining the ash content in the plurality of solid fuels and the specific surface areas of the plurality of solid fuels after ashing; and
a step of determining a mixing ratio of the plurality of types of solid fuels based on the content of the ash and the specific surface area after ashing of each of the plurality of types of solid fuels obtained in the obtaining step so that the specific surface area after ashing of the whole mixture of the plurality of types of solid fuels is a standard value or less, thereby suppressing adhesion of porous ash,
the specific surface area is a measure of the porosity of ash generated by the combustion of the plurality of solid fuels.
2. The method of operating a boiler according to claim 1, wherein the standard value is 5.5m2/g。
3. The method of operating a boiler according to claim 1 or claim 2, wherein the solid fuel is coal.
4. The method of operating a boiler according to claim 1, which is used in a thermal power plant.
5. A boiler plant for mixing and burning a plurality of types of solid fuels, comprising:
a plurality of mechanisms for supplying the solid fuels of different types, respectively;
a mechanism for mixing the plurality of types of solid fuels 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 pulverizing mechanism;
means for determining a mixing ratio of the plurality of solid fuels based on a content of ash in each of the plurality of solid fuels and a specific surface area of the plurality of solid fuels after ashing such that the specific surface area of the plurality of solid fuels after ashing is a standard value or less, thereby suppressing adhesion of porous ash; and
means for adjusting the respective supply amounts of the plurality of types of solid fuels introduced from the supply means to the mixing means so as to obtain the mixing ratio of the plurality of types of solid fuels determined by the determination means,
the specific surface area is a measure of the porosity of ash generated by the combustion of the plurality of solid fuels.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-083884 | 2016-04-19 | ||
| JP2016083884A JP6577407B2 (en) | 2016-04-19 | 2016-04-19 | Boiler operation method and boiler equipment |
| PCT/JP2017/014921 WO2017183529A1 (en) | 2016-04-19 | 2017-04-12 | Method for operating boiler and boiler equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108884991A CN108884991A (en) | 2018-11-23 |
| CN108884991B true CN108884991B (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201780023130.9A Active CN108884991B (en) | 2016-04-19 | 2017-04-12 | Method for operating boiler and boiler plant |
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|---|---|
| JP (1) | JP6577407B2 (en) |
| CN (1) | CN108884991B (en) |
| WO (1) | WO2017183529A1 (en) |
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| CN110205420A (en) * | 2019-07-08 | 2019-09-06 | 内蒙古科技大学 | High calcium bituminous coal based on ash fusion characteristic is used for the optimization method of blast furnace blowing |
| JP7471893B2 (en) | 2020-03-31 | 2024-04-22 | Ｕｂｅ三菱セメント株式会社 | Method and apparatus for reforming coal ash |
| JP7415894B2 (en) | 2020-11-27 | 2024-01-17 | Ｊｆｅエンジニアリング株式会社 | Fossil fuel alternative fuel transportation system |
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| JP6175028B2 (en) * | 2014-06-20 | 2017-08-02 | 株式会社神戸製鋼所 | Boiler ash adhesion suppression method and boiler ash adhesion suppression device |
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| JP2001023653A (en) * | 1999-07-12 | 2001-01-26 | Toto Ltd | Compact solid electrolyte film, solid electrolyte type fuel cell containing the same and manufacture thereof |
| CN102472484A (en) * | 2009-07-22 | 2012-05-23 | 株式会社神户制钢所 | Method for suppressing adhesion of ash and device for suppressing adhesion of ash in boiler |
| CN104930534A (en) * | 2014-03-19 | 2015-09-23 | 湖南宜化化工有限责任公司 | Technology reducing carbon content of boiler fly ash |
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| WO2017183529A1 (en) | 2017-10-26 |
| JP6577407B2 (en) | 2019-09-18 |
| JP2017194207A (en) | 2017-10-26 |
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