JP2007046991A - Property evaluating method of fly ash, property evaluation device of fly ash, coal mixing ratio calculating method of coal, coal mixing ratio calculator of coal and coal mixing ratio calculating program of coal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a property evaluating method of fly ash which enables a simple calculation of the properties of fly ash without analyzing fly ash formed when coal is burnt, a property evaluating device of fly ash, a coal mixing ratio calculating method of coal which enables a simple calculation of the mixing ratio of coal for forming fly ash not exceeding an elution standard even if landfill treatment is performed, a coal mixing ratio calculator of coal and a mixing ratio calculating program of coal. <P>SOLUTION: The property evaluating method of fly ash for evaluating the properties of fly ash formed by burning coal without analyzing fly ash is employed to analyze the properties of coal, so that the properties of fly ash formed when coal is burnt are calculated and evaluated from the relation between the measured property value of coal and the property value of fly ash formed when coal is burnt. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fly ash property evaluation method and fly ash property evaluation device, a coal blend ratio calculation method, a coal blend ratio calculation device, and a coal blend ratio calculation program.

  In a thermal power plant using coal as fuel, steam is generated by a boiler using coal as fuel, and a turbine and a generator connected to the turbine are driven by the generated steam to generate power. Combustion exhaust gas generated by combustion is purified and discharged to the atmosphere through a denitration device that detoxifies nitrogen oxides, an electric dust collector that removes soot and dust, a desulfurization device that detoxifies sulfur oxides, and the like.

  Coal contains many trace harmful substances, some of which accumulate in dust. For example, selenium, which is a trace harmful substance, is said to be contained in coal at a maximum of about 10 mg / kg, and selenium is also contained in fly ash recovered by an electric dust collector. The fly ash collected by the electric dust collector is generally landfilled, as well as being effectively used as a raw material for cement.

  As described above, fly ash contains trace amounts of harmful substances. Therefore, when landfill disposal is performed, a dissolution test (dissolution test according to the Ministry of the Environment Notification No. 13) is performed prior to landfill disposal. Only fly ash that falls below the standard value will be landfilled. Since the dissolution standard for landfill disposal of selenium is defined as 0.3 mg / L, landfill treatment is performed only when the value obtained in the dissolution test is less than this value. On the other hand, when it exceeds the standard value, after insolubilization treatment is performed by adding a chemical, landfill disposal is performed.

Many techniques have been developed and disclosed for insolubilizing so that trace toxic substances such as selenium are not eluted from coal ash including fly ash (see, for example, Patent Document 1). Patent Document 1 discloses a method in which iron (trivalent) salt is added to and mixed with dust separated by a dust collector as an elution preventing material for selenium.
Japanese Patent Laid-Open No. 2003-136035

  In addition to the technique described in Patent Document 1, a method for preventing a trace amount of harmful substances from eluting from coal ash by adding a chemical requires a lot of time and cost for the insolubilization treatment. In addition, facilities and locations for storing the discharged coal ash are also required. Because the amount of coal ash discharged from thermal power plants is large, it is not easy to secure facilities and locations. Therefore, it is necessary to operate coal so that coal ash that does not exceed the elution standard can be obtained even if landfill treatment is performed on coal ash containing trace amounts of harmful substances. Of course, if only coal with a low content of trace hazardous substances is burned, the content of trace hazardous substances in coal ash is expected to decrease. .

  In addition, the dissolution test stipulated in the Ministry of the Environment Notification No. 13 requires a lot of time and analytical equipment because it requires a lot of processes, so it is necessary to analyze coal ash without analyzing coal ash. If the amount of elution when ash is landfilled can be predicted, significant advantages in terms of time and cost can be obtained.

  An object of the present invention is to provide a fly ash property evaluation method and a fly ash property evaluation apparatus capable of easily calculating properties without analyzing fly ash generated when coal is burned. Provides a coal blend ratio calculation method, coal blend ratio calculation device, and coal blend ratio calculation program that can calculate the blend ratio of coal that generates fly ash that does not exceed the elution standard even after landfill disposal. For the purpose.

As a result of repeated sincerity studies, the present inventors have found that there is a correlation between trace harmful substances in coal and trace harmful substances in fly ash produced when burned in an actual boiler, and results of elution tests on fly ash. The headline and the present invention were completed. That is, the present invention is a fly ash property evaluation method for evaluating the properties of fly ash generated when coal is burned without analyzing the fly ash,
Analyzing the properties of the coal,
From the relationship between the measured property value of the coal and the property value of the fly ash generated when the coal is burned, the property of the fly ash generated when the coal is burned is calculated and evaluated. This is a method for evaluating the properties of fly ash.

  Further, in the present invention, the property evaluation of the fly ash is based on the relationship between the trace harmful substance concentration contained in the coal and the trace harmful substance concentration contained in the fly ash generated when the coal is burned. The fly ash property evaluation method according to claim 1, wherein the method is carried out by calculating the trace harmful substance concentration contained in the fly ash.

  Further, in the present invention, the property evaluation of the fly ash is based on the relationship between the trace harmful substance concentration contained in the coal and the elution amount of the trace harmful substance contained in the fly ash generated when the coal is burned. The fly ash property evaluation method according to claim 1, wherein the method is performed by calculating an elution amount of the trace amount of harmful substances contained in the fly ash.

In the present invention, the trace harmful substance is selenium, and the relationship between the trace harmful substance concentration contained in the coal and the trace harmful substance concentration contained in the fly ash generated when the coal is burned is The fly ash property evaluation method according to claim 2, wherein the fly ash property evaluation method is represented by the following formula.
Y _Se = 3.75X _Se +1.0 (a)
Where Y _Se is the concentration of selenium contained in fly ash (mg / kg)
X _Se is the concentration of selenium contained in coal (mg / kg)

Further, in the present invention, the trace harmful substances are selenium and arsenic, and the trace harmful substance concentration contained in the coal and the elution amount of the trace harmful substances contained in the fly ash generated when the coal is burned. The relationship is expressed by the following equation, and the fly ash property evaluation method according to claim 3.
Z _Se = 0.099X _Se -0.013 (b)
Z _As = 0.046X _As +0.004 (c)
Here, Z _Se is the elution amount of selenium contained in fly ash (mg / L)
Z _As is the elution amount of arsenic contained in fly ash (mg / L)
X _Se is the concentration of selenium contained in coal (mg / kg)
X _As is the concentration of arsenic contained in coal (mg / kg)

Further, the present invention is a fly ash property evaluation apparatus for evaluating the properties of fly ash generated when coal is burned without analyzing the fly ash,
Calculating means for calculating the property value of the coal;
From the calculated property value of the coal and the relationship between the property value of the coal and the property value of the fly ash generated when the coal is burned, the property of the fly ash generated when the coal is burned A computing means for calculating a value;
It is the property evaluation apparatus of the fly ash characterized by including.

Further, the present invention is a coal blend ratio calculation method for calculating a coal blend ratio when burning coal,
Measure the concentration of trace harmful substances contained in the coal,
From the relationship between the measured trace hazardous substance concentration contained in the coal and the elution amount of the trace hazardous substance contained in the fly ash generated when the coal is burned, the trace harmful substance contained in the fly ash Calculate the elution amount,
From the elution amount of the trace toxic substance contained in the fly ash and the elution amount reference value of the trace toxic substance, the elution amount of the trace toxic substance contained in the fly ash is less than or equal to the elution amount reference value. A blending ratio calculation method for coal, wherein the blending ratio of coal is calculated.

In the present invention, the trace harmful substances are selenium and arsenic,
The coal mixture is calculated such that when the coal mixture ratio of the coal is calculated, the elution amount of both the selenium and the arsenic contained in the fly ash is equal to or less than the elution amount reference value. This is a method for calculating the coal blend ratio.

Further, the present invention is a coal blend ratio calculation device that calculates a blend ratio of coal when burning coal,
A concentration measuring means for measuring the concentration of trace harmful substances in coal;
Input means for inputting data including the concentration measured by the concentration measuring means;
Storage means for storing data;
From the relationship between the trace hazardous substance concentration in the coal measured by the concentration measuring means and the elution amount of trace harmful substances contained in the fly ash generated when the coal and the coal are burned, the fly ash An elution amount calculating means for calculating the elution amount of the contained trace amount of harmful substances,
From the elution amount of the trace hazardous substance contained in the fly ash calculated by the elution amount calculating means and the elution amount reference value of the trace hazardous substance, the elution amount of the trace hazardous substance contained in the fly ash is A blend ratio calculation means for calculating a blend ratio of coal that is equal to or less than the reference amount;
An output means for outputting data;
It is a coal blend ratio calculation device characterized by including.

Further, the present invention relates to the trace amount of harmful substances contained in the fly ash from the relationship between the concentration of trace harmful substances in the coal and the elution amount of the trace harmful substances contained in the fly ash produced when the coal is burned. Calculate the leaching amount of harmful substances,
From the calculated elution amount of the trace toxic substance contained in the fly ash and the elution amount reference value of the trace toxic substance, the elution amount of the trace toxic substance contained in the fly ash is equal to or less than the elution amount reference value. This is a coal blend ratio calculation program for causing a computer to perform the process of calculating the coal blend ratio.

  The property evaluation method of the fly ash produced when the coal of the present invention is burned is performed by analyzing the property of the coal and from the relationship between the measured property value of the coal and the property value of the fly ash produced when the coal is burned. Since the properties of fly ash produced when coal is burned are calculated and evaluated, the properties of fly ash can be grasped and evaluated without analyzing the fly ash. Since the properties can be calculated without analyzing the fly ash, the properties of the fly ash can be evaluated at a low cost and in a short time.

  Further, according to the present invention, the fly ash property evaluation is included in the fly ash from the relationship between the trace harmful substance concentration contained in coal and the trace harmful substance concentration contained in the fly ash generated when the coal is burned. Since it is performed by calculating the trace harmful substance concentration, the trace harmful substance concentration contained in the fly ash generated when coal is burned can be predicted without analyzing the fly ash. This makes it possible to easily determine the application and processing method of fly ash.

  In addition, according to the present invention, fly ash properties are evaluated based on the relationship between the concentration of trace hazardous substances contained in coal and the amount of trace harmful substances contained in the fly ash produced when coal is burned. Since it is performed by calculating the elution amount of contained trace harmful substances, it is possible to predict the elution amount of trace harmful substances contained in fly ash generated when coal is burned. This makes it possible to easily determine the application and processing method of fly ash.

  According to the present invention, the trace harmful substance is selenium, and the relationship between the trace harmful substance concentration contained in coal and the trace harmful substance concentration contained in fly ash produced when coal is burned is expressed by the formula ( Since it is shown by a), the content of selenium contained in the fly ash generated when coal is simply burned can be calculated using the formula (a).

  Further, according to the present invention, the trace hazardous substances are selenium and arsenic, and the relationship between the trace hazardous substance concentration contained in coal and the elution amount of trace hazardous substances contained in fly ash produced when coal is burned. Is expressed by formula (b) and formula (c), so the amount of selenium and arsenic eluted from the fly ash produced when coal is simply burned is calculated using formula (b) and formula (c). can do.

  Further, the fly ash property evaluation apparatus generated when the coal of the present invention is burned is a calculation means for calculating the property of coal, the calculated property value of coal, the property value of coal, and generated when the coal is burned. Calculation means for calculating the property value of the fly ash generated when coal is burned from the relationship with the property value of the fly ash. The properties of can be calculated and evaluated.

  Further, the coal blend ratio calculation method for calculating the mixing ratio of coal when burning the coal of the present invention is to measure the concentration of trace harmful substances contained in the coal, and measure the concentration of trace harmful substances contained in the coal and the coal The amount of trace harmful substances contained in fly ash is calculated from the relationship between the amount of trace harmful substances contained in fly ash produced when the ash is burned, and the amount of trace harmful substances contained in fly ash Calculate the coal mixing ratio so that the elution amount of trace hazardous substances contained in fly ash is less than the elution amount standard value from the elution amount standard value of trace harmful substances. Can do. Moreover, even if coal is burned, fly ash containing a trace amount of harmful substances below the elution amount reference value can be obtained.

  Further, according to the coal blend ratio calculation method of the present invention, the trace components are selenium and arsenic, and when calculating the coal blend ratio of coal, the dissolution amount of both selenium and arsenic contained in the fly ash is based on the dissolution amount standard. Since the coal is mixed so as to be less than the value, selenium and arsenic exceeding the reference value will not be eluted from the fly ash even if the fly ash generated when the coal is burned is landfilled.

  Further, the coal blend ratio calculation apparatus of the present invention includes a concentration measuring means for measuring a trace harmful substance concentration in coal, an input means for inputting data including the concentration measured by the concentration measuring means, and a storage means for storing the data. Trace toxic substance concentration in coal measured by the concentration measuring means and the leaching amount of trace toxic substance contained in fly ash produced when coal and coal are burned. The elution amount calculation means for calculating the elution amount of the substance, the elution amount of the trace hazardous substance contained in the fly ash calculated by the elution amount calculation means, and the elution amount reference value for the trace hazardous substance, Because it includes coal blending ratio calculation means that calculates the coal mixing ratio so that the elution amount of the substance is less than or equal to the elution volume reference value, and output means that outputs data, it is easy to use the coal blend ratio calculation device of this coal The coal blend ratio It can be out.

  In addition, the coal blend ratio calculation program of the present invention is based on the relationship between the concentration of trace hazardous substances in coal and the amount of trace harmful substances contained in the fly ash generated when coal and coal are burned. Calculate the amount of trace harmful substances contained in the fly ash and calculate the amount of trace harmful substances contained in the fly ash from the calculated amount of trace harmful substances and the reference amount of trace harmful substances. Since this is a program for causing a computer to perform a process of calculating a coal mixing ratio that is equal to or less than the reference amount, the coal mixing ratio can be easily calculated by installing this program in the computer.

  FIG. 1 is a block diagram showing a schematic configuration of a coal blend ratio calculation apparatus 1 according to an embodiment of the present invention. The coal blend ratio calculation apparatus 1 can also be used as a fly ash property evaluation apparatus, and the schematic configurations of the coal blend ratio calculation apparatus and the fly ash property evaluation apparatus are the same.

  The coal blend ratio calculation apparatus 1 has a concentration measuring means 10 for measuring the concentration of trace harmful substances contained in coal, which is one of the property values of coal, and processes the data to determine the coal blend ratio (mix ratio). The data processing device 20 to be calculated is mainly configured. The concentration measuring means 10 is composed of a device, equipment, etc. for measuring the concentration of trace harmful substances contained in coal. For example, the concentration measuring means 10 for trace harmful substances contained in coal includes a combustion device that burns coal, an absorption liquid that absorbs trace harmful substances contained in exhaust gas generated by combustion, and a trace harmful substance contained in the absorption liquid. An ICP emission spectroscopic analyzer capable of calculating the concentration, an atomic absorption spectrometer, or the like can be used.

  The data processing device 20 includes data input means 21 for inputting data, storage means 22 for storing and storing data and calculation programs, calculation means 23 for reading the data and calculation programs stored in the storage means 22 and calculating the mixing ratio of coal. , And output means 24 for outputting data such as the mixing ratio of coal as a calculation result. As the data processing apparatus 20, a personal computer, a workstation, a mainframe, etc. are illustrated.

  As input means 21 for inputting the concentration data of trace harmful substances contained in coal measured by the concentration measuring means 10, a mouse, a keyboard, a flexible disk reading mechanism, reception for receiving data transmitted wirelessly or by wire. The part etc. are illustrated. Data input may be either offline or online. In the offline case, data can be manually input with a keyboard. It is also possible to input data by storing the data measured by the concentration measuring means once in a flexible disk, CD-ROM, memory card or the like and then reading it with a reader. When inputting data online, for example, the data transmission unit of the ICP emission spectroscopic analysis device or the atomic absorption spectrometry device and the data reception unit of the data processing device 20 are connected using a cable, or a mobile phone, PHS It is also possible to use a data transmitter / receiver capable of transmitting data wirelessly.

  The storage unit 22 includes a data storage unit that stores various data input via the input unit 21 and a program storage unit that stores an arithmetic program and the like, and stores data, an arithmetic program, and the like in each storage unit. The calculation program can be installed from a CD-ROM via a CD-ROM drive (not shown).

  Even if the calculation means 23 carries out landfill disposal of the fly ash produced when coal is burned from the trace amount harmful substance data contained in the coal memorize | stored in the memory | storage means 22, and a calculation program, it is less than an elution reference value. The blend ratio of coal producing fly ash as a quantity is calculated, and data is output via the output means 24. Examples of the output means 24 include a display, a printer, and a hard disk.

  FIG. 2 is a flowchart showing a procedure for calculating the coal blend ratio using the coal blend ratio calculating apparatus 1. In addition, here shows the procedure that can calculate not only the coal mixture ratio but also the concentration of trace harmful substances contained in the fly ash produced when coal is burned, and the amount of trace harmful substances eluted from the fly ash. . It should be noted that the combinations and order of determinations from step S1 to step S9 are only examples and may be changed.

  In step S1, the concentration of trace harmful substances in the coal is measured. The concentration measurement is performed using the concentration measuring means 10 shown in FIG. Selenium and arsenic are exemplified as the trace harmful substances in the coal calculated here. Subsequent to the measurement of the concentration of trace harmful substances in the coal in step S1, data is input in step S2. Data is input via the input means 21 shown in FIG. The data input in step S2 includes the coal production area, the coal lot number, the concentration of trace harmful substances in the coal, the calorific value, and the like.

  It is well known that the properties of coal differ depending on the place of production, but since the properties also differ depending on the time of production, etc., a lot number is assigned to identify the coal in addition to the region of coal production. Also enter the lot number. The concentration of trace harmful substances in the coal is essential input data, and the coal mixture ratio is produced from this data and a calculation program described later. Although the calorific value of coal is not essential data, the calorific value of coal at the time of coal blending can also be calculated by inputting the calorific value.

  In step S3, it is determined whether or not to calculate the concentration of trace harmful substances in the fly ash produced when coal is burned, and when it is selected to calculate the concentration of trace harmful substances in the fly ash, If the concentration of the trace harmful substance in the fly ash is calculated in step S4 and it is not selected to calculate the concentration of the trace harmful substance in the fly ash, the process proceeds to step S5.

  In step S 4, the calculation means 23 uses the input data input via the input means 21 and stored in the storage means 22, and the trace harmful substance concentration calculation program contained in the fly ash stored in the storage means 22. Calculate the concentration of trace harmful substances in fly ash. The inventors have found that there is a correlation between the concentration of trace harmful substances contained in fly ash produced when burning coal containing trace harmful substances and the trace harmful components contained in coal, A correlation equation was obtained.

Fig. 3 shows the selenium concentration (actual measurement value) of selenium, which is one of the trace harmful substances in coal, and the selenium concentration (actual measurement value) contained in the fly ash produced when coal containing selenium is burned. (1) was obtained by formulating these relationships. Although the calculation method (analysis method) of the selenium concentration contained in coal is as having shown previously, the selenium concentration contained in fly ash was also analyzed by the same method. By programming equation (1), a program for calculating the concentration of trace hazardous substances contained in fly ash can be obtained.
Y _Se = 3.75X _Se +1.0 (1)
Where Y _Se is the concentration of selenium contained in fly ash (mg / kg)
X _Se is the concentration of selenium contained in coal (mg / kg)

  The number of data actually measured in FIG. 3 is 10, and the coal at this time includes coal (mixed coal) in which a variety of coal is mixed in addition to a single variety of coal. As a result of actual measurement, the relationship between the concentration of selenium in coal and the concentration of selenium contained in fly ash is the same regardless of whether the coal is a single variety or a blend of different types of coal. I understood.

  The broken line in FIG. 3 is a line indicating the maximum concentration of trace harmful substances contained in the fly ash. If analysis error, data variation, and sample segregation are taken into consideration, the maximum value of about 3 mg / kg is given in Equation (1). It is judged that there is an error. Since the formula (1) is a very simple formula, it is possible to easily calculate the concentration of trace harmful substances contained in the fly ash. In addition, although the relationship between coal and fly ash produced when coal is burned is shown here, it goes without saying that trace harmful substances are not limited to selenium.

  In step S5, it is determined whether or not the amount of elution of trace harmful substances when landfill disposal of fly ash generated when coal is burned is calculated, and the amount of elution of trace harmful substances in fly ash is calculated. If it is selected, the elution amount of the trace harmful substance in the fly ash is calculated in step S6. If it is not selected to calculate the elution amount of the trace harmful substance in the fly ash, the process proceeds to step S7.

  In step S 6, as in step S 4, the calculation means 23 inputs the input data inputted via the input means 21 and stored in the storage means 22, and the elution of trace harmful substances in the fly ash stored in the storage means 22. The amount of elution at the time of landfill disposal of trace harmful substances in fly ash is calculated using a volume calculation program. The inventors have found that there is a correlation between the elution amount of trace harmful substances contained in fly ash produced when burning coal containing trace harmful substances and trace harmful substances contained in coal. The correlation equation was obtained.

Fig. 4 shows the selenium concentration (actual measured value) of selenium, which is one of the trace harmful substances in coal, and the amount of selenium dissolved in fly ash produced when coal containing selenium is burned (actually measured). It is a figure which shows the relationship with (value). Further, FIG. 5 shows the arsenic concentration (actually measured value) of arsenic coal, which is one of the trace harmful substances in coal, and the amount of arsenic contained in the fly ash generated when coal containing arsenic is burned ( It is a figure which shows the relationship with (measured value). Formulas (2) and (3) were obtained by formulating these relationships. Measurement of the amount of selenium and arsenic contained in fly ash at the time of landfill disposal is carried out using atomic absorption spectrometry after adjusting the sample based on the Ministry of the Environment Notification No. 13 test method and factory wastewater test method (JISK0102). It was. By programming Equations (2) and (3), an elution amount calculation program for trace harmful substances in fly ash can be obtained.
Z _Se = 0.099X _Se -0.013 (2)
Z _As = 0.046X _As +0.004 (3)
Here, Z _Se is the elution amount of selenium contained in fly ash (mg / L)
Z _As is the elution amount of arsenic contained in fly ash (mg / L)
X _Se is the concentration of selenium contained in coal (mg / kg)
X _As is the concentration of arsenic contained in coal (mg / kg)

  The number of data actually measured in FIG. 4 is 10, and the number of data actually measured in FIG. Coal at this time includes coal (mixed coal) in which a variety of coal is mixed in addition to a single variety of coal. As a result of actual measurement, the relationship between the concentration of selenium in coal and the amount of selenium dissolved in fly ash at the time of landfill disposal is either a single varieties or a mixture of many varieties of coal. It turns out that they are in the same relationship. The same was true for arsenic.

  The broken line in FIG. 4 is a line indicating the maximum value of the selenium elution amount contained in the fly ash. In consideration of analysis error, data variation, and sample segregation, a maximum of about 0. It is judged that there is an error of 075 mg / L. Similarly, the broken line in FIG. 5 is a line indicating the maximum value of the amount of arsenic contained in the fly ash. If analysis error, variation in data, and sample segregation are taken into consideration, the maximum value is calculated in Equation (3). It is judged that there is an error of 0.17 mg / L. Since Formula (2) and Formula (3) are very simple formulas, it is possible to easily calculate the elution amount of a trace amount of harmful substances contained in fly ash. Although the relationship between selenium and arsenic is shown here with coal and fly ash generated when coal is burned, it goes without saying that trace harmful substances are not limited to selenium and arsenic.

  In step S7, it is determined whether or not to calculate the coal blend ratio, and if it is selected to calculate the coal blend ratio, the coal blend ratio is calculated in step S8 and step S9, and the coal blend ratio is calculated. If it is not selected to calculate the ratio, the process proceeds to step S10.

  In step S8, as in step S6, the calculation means 23 inputs the input data input via the input means 21 and stored in the storage means 22, and the elution of trace harmful substances in the fly ash stored in the storage means 22 Using a volume calculation program, calculate the amount of elution at the time of landfill disposal of trace harmful substances in fly ash. Subsequently, in step S9, the coal mixture ratio of coal is calculated from the elution amount at the time of landfill disposal of the trace harmful substances in the fly ash calculated at step S8 and the elution reference value at the time of landfill disposal of the trace hazardous substances.

  Calculation of the coal blend ratio of coal can be calculated in the following manner. As shown in Fig. 4, the relationship between the concentration of selenium in coal and the leaching amount of selenium contained in fly ash at the time of landfill disposal is a mixture of mixed varieties of coal, even if the coal is a single variety. However, since it is confirmed that they are in the same relationship, the additivity is established and the equation (4) is established. This is the same for arsenic, and the formula (5) is established for arsenic.

  An example of the calculation of coal blend is shown. Coal is a mixture of two types of coal (Coal 1 and Coal 2). The reference value for the elution amount of selenium contained in the fly ash is set to 0.15 mg / L in consideration of data variation. When the amount of selenium contained in coal 1 is 2 mg / kg and the amount of selenium contained in coal 2 is 1 mg / kg, the mixing ratio of coal 1 and coal 2 from formula (2) and formula (4) is 65 wt. % And 35% by weight. From this result, when coal 1 and coal 2 are mixed, if the mixing ratio of coal 1 is 65% by weight or less, the elution amount of fly ash obtained is 0.15 mg / L or less. Similarly, the blend ratio based on arsenic can be calculated using Formula (3) and Formula (5). In addition, it is desirable to mix the coal so that selenium and arsenic in the fly ash simultaneously satisfy the elution standard value.

  As described above, by using the equations (2) to (5), the mixing ratio of coal can be easily calculated. Needless to say, by measuring the concentration of trace harmful substances in coal mixed in advance, it is possible to calculate the amount of harmful trace substance elution from fly ash produced when this coal is burned. Furthermore, the calorific value after blending can be calculated as necessary.

  As described above, it is possible to calculate the coal mixture ratio of coal by the operation from step S1 to step S9. However, when calculating only the concentration of trace harmful substances contained in the fly ash generated when coal is fueled, from step S1. In the case where the operation of step S3 is to calculate only the elution amount of trace harmful substances contained in the fly ash generated when coal is fueled, the operation of steps S1 to S6 may be performed.

1 is a block diagram showing a schematic configuration of a coal blend ratio calculation apparatus 1 as one embodiment of the present invention. It is a flowchart which shows the procedure which calculates the coal mixture ratio of coal using the coal mixture ratio calculation apparatus 1 of this invention. The relationship between the selenium concentration (actual value) of selenium, which is one of the trace harmful substances in coal, and the selenium concentration (actual value) contained in the fly ash produced when coal containing selenium is burned. FIG. The selenium concentration (actual measured value) of selenium, which is one of the trace harmful substances in coal, and the elution amount (actual measured value) of selenium contained in the fly ash produced when coal containing selenium is burned It is a figure which shows a relationship. The arsenic concentration of arsenic, which is one of the trace harmful substances in coal (actually measured value), and the arsenic elution amount (actually measured value) contained in the fly ash produced when coal containing arsenic is burned It is a figure which shows a relationship.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coal mixture ratio calculation apparatus 20 Data processing apparatus 21 Input means 22 Storage means 23 Calculation means 24 Output means

Claims (10)

A fly ash property evaluation method for evaluating the properties of fly ash generated when coal is burned without analyzing the fly ash,
Analyzing the properties of the coal,
From the relationship between the measured property value of the coal and the property value of the fly ash generated when the coal is burned, the property of the fly ash generated when the coal is burned is calculated and evaluated. A method for evaluating the properties of fly ash.   The property evaluation of the fly ash is based on the relationship between the concentration of trace harmful substances contained in the coal and the concentration of trace harmful substances contained in the fly ash generated when the coal is burned, and the trace amount contained in the fly ash. The fly ash property evaluation method according to claim 1, wherein the method is performed by calculating a harmful substance concentration.   The property evaluation of the fly ash is included in the fly ash from the relationship between the concentration of trace harmful substances contained in the coal and the elution amount of trace harmful substances contained in the fly ash generated when the coal is burned. The fly ash property evaluation method according to claim 1, wherein the method is performed by calculating an elution amount of the trace amount of harmful substances. The trace harmful substance is selenium, and the relationship between the trace harmful substance concentration contained in the coal and the trace harmful substance concentration contained in the fly ash generated when the coal is burned is represented by the following equation: The method for evaluating the properties of fly ash according to claim 2.
Y _Se = 3.75X _Se +1.0 (a)
Where Y _Se is the concentration of selenium contained in fly ash (mg / kg)
X _Se is the concentration of selenium contained in coal (mg / kg) The trace hazardous substances are selenium and arsenic, and the relationship between the trace hazardous substance concentration contained in the coal and the elution amount of the trace harmful substances contained in the fly ash generated when the coal is burned is as follows: The fly ash property evaluation method according to claim 3, wherein the fly ash property evaluation method is expressed by a formula.
Z _Se = 0.099X _Se -0.013 (b)
Z _As = 0.046X _As +0.004 (c)
Here, Z _Se is the elution amount of selenium contained in fly ash (mg / L)
Z _As is the elution amount of arsenic contained in fly ash (mg / L)
X _Se is the concentration of selenium contained in coal (mg / kg)
X _As is the concentration of arsenic contained in coal (mg / kg) A fly ash property evaluation device that evaluates the properties of fly ash generated when coal is burned without analyzing the fly ash,
Calculating means for calculating the property value of the coal;
From the calculated property value of the coal and the relationship between the property value of the coal and the property value of the fly ash generated when the coal is burned, the property of the fly ash generated when the coal is burned A computing means for calculating a value;
An apparatus for evaluating the properties of fly ash, comprising: A coal blend ratio calculation method for calculating a coal blend ratio when burning coal,
Measure the concentration of trace harmful substances contained in the coal,
From the relationship between the measured trace hazardous substance concentration contained in the coal and the elution amount of the trace hazardous substance contained in the fly ash generated when the coal is burned, the trace harmful substance contained in the fly ash Calculate the elution amount,
From the elution amount of the trace toxic substance contained in the fly ash and the elution amount reference value of the trace toxic substance, the elution amount of the trace toxic substance contained in the fly ash is less than or equal to the elution amount reference value. A method for calculating a coal blend ratio, comprising calculating a coal blend ratio. The trace harmful substances are selenium and arsenic,
The coal mixture is calculated such that when the coal mixture ratio of the coal is calculated, the elution amount of both the selenium and the arsenic contained in the fly ash is equal to or less than the elution amount reference value. Coal blend ratio calculation method. A coal blend ratio calculation device for calculating a blend ratio of coal when burning coal,
A concentration measuring means for measuring the concentration of trace harmful substances in coal;
Input means for inputting data including the concentration measured by the concentration measuring means;
Storage means for storing data;
From the relationship between the trace hazardous substance concentration in the coal measured by the concentration measuring means and the elution amount of trace harmful substances contained in the fly ash generated when the coal and the coal are burned, the fly ash An elution amount calculating means for calculating the elution amount of the contained trace amount of harmful substances,
From the elution amount of the trace hazardous substance contained in the fly ash calculated by the elution amount calculating means and the elution amount reference value of the trace hazardous substance, the elution amount of the trace hazardous substance contained in the fly ash is A blend ratio calculation means for calculating a blend ratio of coal that is equal to or less than the reference amount;
An output means for outputting data;
The coal blend ratio calculation apparatus characterized by including. From the relationship between the concentration of trace harmful substances in coal and the amount of trace harmful substances contained in the fly ash produced when the coal is burned, the amount of trace harmful substances contained in the fly ash To calculate
From the calculated elution amount of the trace toxic substance contained in the fly ash and the elution amount reference value of the trace toxic substance, the elution amount of the trace toxic substance contained in the fly ash is equal to or less than the elution amount reference value. A coal blend ratio calculation program for causing a computer to perform the process of calculating the coal blend ratio.

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