JP2003161728A - METHOD FOR MEASURING AMOUNT OF Ca CONSTITUENT IN ASH IN PRESSURIZED FLUIDIZED BED COMBUSTION APPARATUS, AND CONTROL METHOD OF THE PRESSURIZED FLUIDIZED BED COMBUSTION APPARATUS - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measurement method that can acquire the amount of Ca constit uent in ash rapidly without any time for dissolving a sample and can measure the amount of Ca constituent in ash in a pressurized fluidized bed combustion apparatus for coping with the change in the operation condition in the pressurized fluidized bed combustion apparatus, and at the same time, to provide a control method of the pressurized fluidized bed combustion apparatus which is easily automated and speeded up and by which the amount of Ca constituent can be measured, and the working condition of the pressurized fluidized bed combustion apparatus can be rapidly grasped and the control can be appropriately performed. <P>SOLUTION: The control method includes an ash-sampling process for sampling the ash of fuel slurry at each specific period from the pressurized fluidized bed combustion apparatus by burning the fuel slurry containing carbon and limestone in a fluidized bed, a dissolution process for dissolving a Ca constituent by performing the acid treatment of the ash, and a determining process for determining the amount of Ca constituents in liquid obtained by dissolution in the dissolution process. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for measuring the amount of Ca in ash in a pressurized fluidized bed combustion apparatus (PFBC) and a method for controlling the pressurized fluidized bed combustion apparatus using the same.

[0002]

2. Description of the Related Art In a pressurized fluidized bed combustion apparatus employing an in-furnace desulfurization system, coal as a fuel and limestone as a desulfurizing agent are mixed and supplied to a fluidized bed for combustion. In the combustion ash generated at this time, a component (S
iO ₂ , Al ₂ O _3, etc.) and components derived from limestone (Ca
(For example, CO ₃ ) is mixed, it is difficult to quickly analyze and acquire the Ca component and accurately control the pressurized fluidized bed combustion device. Further, when the amount of Ca component in the ash collected by the cyclone into which the exhaust gas of the pressurized fluidized bed combustion apparatus is introduced is increased, there is a problem that an ash transfer pipe is blocked. Therefore, in order to stably operate the pressurized fluidized bed combustor, it is necessary to sample the ash at a suitable time and perform a quick analysis to monitor the change in the amount of Ca component. Conventionally, the Ca component in ash discharged from a combustion furnace or the like has been measured as follows. That is, first, sodium carbonate is mixed with the sample to be measured, and this mixture is melted in a platinum crucible. The melt obtained is dissolved in hydrochloric acid, and the filtrate obtained by perchloric acid treatment and the washing liquid are collected. Next, ammonia water is added to the mixed liquid of the filtrate and the washing liquid to precipitate iron, aluminum, magnesium, etc. in the liquid as hydroxides, and the mixture is filtered. The solution from which these metals had been removed was titrated with an EDTA standard solution using an NN indicator while masking the interfering components with potassium cyanide, and the amount of Ca component in the ash was measured.

[0003]

However, the above conventional techniques have the following problems. (1) Since it is necessary to completely melt a sample collected using sodium carbonate in a platinum crucible, this heating,
There is a problem that it takes a lot of time for cooling, and it is difficult to accurately and promptly acquire the amount of Ca component in the ash in response to changes in the operating condition of the pressurized fluidized bed combustor. (2) Since the Ca component analysis includes a melting process by heating the sample, it is not suitable for automating or speeding up the process, and when constructing a control system for a pressurized fluidized bed combustor. There was a problem of causing trouble.

The present invention is intended to solve the above-mentioned conventional problems, and it is possible to quickly obtain the amount of Ca component in ash without requiring time for heating and cooling, and to check the operating condition of the pressurized fluidized bed combustion apparatus. C in ash in a pressurized fluidized bed combustor capable of adapting to changes
While providing a method for measuring the amount of a component, it is easy to automate and speed up the measurement of the amount of Ca component, and pressurization that can quickly grasp the operating status of the pressurized fluidized bed combustion device and perform its control appropriately. An object is to provide a method for controlling a fluidized bed combustion device.

[0005]

In order to achieve the above object, the present invention has the following constitution. The method for measuring the amount of Ca in ash in a pressurized fluidized bed combustor according to claim 1, wherein the ash of the fuel slurry is combusted from a pressurized fluidized bed combustor that combusts a fuel slurry containing coal and limestone in a fluidized bed. It comprises an ash collecting step of collecting, a dissolving step of acid-treating the ash to dissolve the Ca component, and a quantifying step of quantifying the Ca component in the filtrate obtained by dissolving the ash in the dissolving step. ing. With this configuration, the following effects can be obtained. (A) Since it has an ash collection process that collects ash from the pressurized fluidized bed combustor every predetermined period, it acquires the data of the amount of Ca component necessary to grasp the in-reactor situation that changes from moment to moment, and this data Based on the above, the operation of the pressurized fluidized bed combustion device can be appropriately controlled. (B) Since heating and cooling do not take time, the amount of Ca component in ash can be quickly acquired, and the operating condition of the pressurized fluidized bed combustor can be changed. (C) It is possible to facilitate the automation of the Ca component amount measurement, prevent abnormal combustion and blockage of the ash transport pipe, and appropriately control the pressurized fluidized bed combustion apparatus. (D) Since only the Ca component in the ash is measured,
The data necessary for operating the pressurized fluidized bed combustor can be acquired quickly and efficiently, and the time lag due to the measurement of the Ca component can be reduced.

Here, the pressurized fluidized bed combustor is an in-furnace desulfurization type combustor in which slurry or dry particles containing limestone and coal are used as fuel to burn with air in the fluidized bed. Besides, non-pressurized type is also included. The fuel slurry is a slurry obtained by crushing coal and limestone at a predetermined ratio and adding and mixing a predetermined amount of water. The ash extraction step is a step of extracting ash from a cyclone into which exhaust gas from a pressurized fluidized bed combustor is introduced, an ash storage section such as an electrostatic precipitator (EP), or an ash transfer pipe in which ash is transported. It is possible to automatically collect a predetermined amount of a sample for measurement via a sampling tube or an aspirator inserted in the ash storage section or the ash transfer tube. The dissolving step is a step of putting the sample ash in an acid solution having a predetermined concentration such as hydrochloric acid and dissolving the calcium content in the sample ash in the filtrate while stirring the treatment liquid at a predetermined temperature. The quantification step includes a step of quantifying the calcium content in the filtrate by applying a titration method using EDTA, an inductively coupled high frequency plasma spectroscopic analysis (ICP) method, an atomic absorption analysis method, or the like.

The method for measuring the amount of Ca in ash in the pressurized fluidized bed combustor according to claim 2 is the method according to claim 1, wherein the ash collected in the ash collecting step is from the fluidized bed. It is configured to be cyclone ash captured by a cyclone into which the generated exhaust gas is introduced or EP ash collected by an electric dust collector. With this configuration, in addition to the operation of claim 1, the following operation can be obtained. (A) The ash collected in the ash collection process is cyclone ash or E
Since it is P ash, its particle size and density are smaller than that of ash discharged from the lower part of the fluidized bed, and the components change sensitively to changes in the conditions inside the furnace. Therefore, by analyzing this, data that accurately reflects the situation inside the furnace can be acquired, which can contribute to the control of the pressurized fluidized bed combustion apparatus.

A method for measuring the amount of Ca in ash in a pressurized fluidized bed combustor according to a third aspect is the method according to the first or the second aspect, wherein the quantification step comprises adding an NN indicator and triethanolamine. It is configured to be a titration step of adding to the filtrate and titrating Ca ions in the filtrate using EDTA. With this configuration, claim 1
Alternatively, the following action can be obtained in addition to the action of 2. (A) Since Ca ions in the filtrate are titrated using the NN indicator and triethanolamine, the titration operation can be performed in a standardized procedure, which is excellent in reliability and accuracy, and the measurement work can be performed efficiently. be able to. Here, the NN reagent was mixed with 100 parts by mass of potassium nitrate to 1 part by mass of 1- (2-hydroxy-4-sulfo-1-naphthylazo) -2-hydroxy-3-naphthoic acid until homogeneous. It is mixed and kept in a brown bottle. E
DTA is a standard solution (M / 100) of disodium ethylenediaminetetraacetate.

According to a fourth aspect of the present invention, there is provided a method for controlling a pressurized fluidized bed combustion device according to any one of the first to third aspects, which is a method for measuring the amount of Ca component in ash of the pressurized fluidized bed combustion device. The measured Ca component amount and the Ca component amount history data of the pressurized fluidized bed combustor are compared, and the coal and the limestone supplied to the pressurized fluidized bed combustor and the high pressure for forming the fluidized bed are compared. It is configured to regulate the respective supply of air. With this configuration, the following effects can be obtained. (A) Since the amount of Ca component in the ash collected from the pressurized fluidized bed combustor is measured and the amounts of coal, limestone, and high-pressure air supplied are adjusted based on the historical data, C
It is possible to prevent abnormal combustion caused by changes in the fluid state and combustibility due to fluctuations in the a component, blockage of the ash transfer pipe, and the like, and to always maintain the operating state of the pressurized fluidized bed combustion apparatus appropriately. (B) Since the combustion state of the pressurized fluidized bed combustor is stably controlled even if the components of the fuel slurry and the like fluctuate, it is possible to optimize the energy cost and perform the operation, which is excellent in economic efficiency. . (C) C accumulated during operation of the pressurized fluidized bed combustor
Since the historical data of the amount of a component can be effectively reflected, various fluctuations can be suppressed and the operation can be performed more easily.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A method for measuring the amount of Ca in ash and a method for controlling a pressurized fluidized bed combustion device in a pressurized fluidized bed combustion device according to an embodiment of the present invention will be described below. FIG. 1 is a configuration diagram of a pressurized fluidized bed combustion device to which a method for measuring the amount of Ca in ash in a pressurized fluidized bed combustion device according to an embodiment of the present invention is applied. In FIG. 1, 10 is a pressurized fluidized bed combustor, 11 is a pressure vessel, and 12 is a pressure vessel 11.
A combustion chamber accommodated in the combustion chamber for holding and burning the fuel slurry in a fluidized state, 13 is a multi-stage cyclone into which combustion gas discharged from the upper portion of the combustion chamber 12 is introduced, and 14 is coal at the lower portion of the combustion chamber 12. , A fuel slurry pump for mixing a predetermined amount of each of limestone and water and supplying the mixture to the lower portion in the combustion chamber 12, 15 is an ash storage tank for storing ash in the combustion gas extracted from the lower portion of the cyclone 13, and 15a is A collecting device for collecting the ash (preferably the latest ash) of the ash storage tank 15, a compressor 16 for supplying high pressure air for fluidizing the fuel slurry in the combustion chamber 12 to form a fluidized bed, and a cyclone 17 A gas turbine driven by combustion gas supplied from the upper portion of 13, a generator rotated by a gas turbine 17, and 19 through a heat exchange pipe in combustion chamber 12. A steam turbine driven by the heated steam Te, 20 generator to be rotated by the steam turbine 19, 21 is a condenser for condensing the steam supplied from the steam turbine 19, 22 is the combustion chamber 12 and the steam turbine 19
A water supply pump for circulating supply of water between
Is a flue gas denitration device for performing denitration of the gas discharged from the gas turbine 17, and 24 is a heat source of the gas supplied from the flue gas denitration device 23 for preheating the feed water sent to the combustion chamber 12 via the water feed pump 22. For removing heat, 25 is an electric dust collector for removing fine solids contained in the exhaust gas of the exhaust heat water heater 24, 25a is a sampling device for ash captured by the electric dust collector 25, and 26 is exhaust gas Of the ash storage tank 15 and the electrostatic precipitator 25 for collecting the smoke from the stack 15a and the sampling device 25.
The control device controls the fuel slurry pump 14, the compressor 16, and the water supply pump 22 by inputting the analysis data of the cyclone ash and the EP ash collected via a.

The control device 27 is provided as necessary and constitutes a part of a control system for controlling the entire pressurized fluidized bed combustion device 10. The controller 27 compares the measured Ca component amount in ash with the Ca component amount history data of the pressurized fluidized bed combustor 10 according to a program stored in advance in the memory, and the pressurized fluidized bed combustor is compared. Coal and limestone supplied to the combustion chamber 12 of 10 and compressor 16
The amount of high-pressure air supplied to the lower portion of the combustion chamber 12 can be adjusted by. Sampling device 15a
The sampling device 25a includes a sampling pipe inserted into the ash storage tank 15 and the electrostatic precipitator 25, a discharge pipe provided at the bottom of the sampling pipe, a suction device, and the like, and includes an opening / closing valve configured in two stages. Pressurized fluidized bed combustor 1
A certain amount of ash can be collected even when 0 is in operation.

A method for measuring the amount of Ca component in ash in the pressurized fluidized bed combustion apparatus configured as described above will be described. In the ash collection step, a predetermined amount of cyclone ash and EP ash are collected from the ash storage tank 15 and the electrostatic precipitator 25 via the collection device 15a, the sampling device 25a, etc., at predetermined intervals, for example, every 12 hours. In the melting process,
As shown in the dissolution process flow chart in FIG. 2, 20% HCl (l
8.5 ml) and 100% HClO (5 ml) were added to the collected cyclone ash and EP ash samples (2.0 g) and acid treatment was performed under heating conditions of 90 ° C. to 110 ° C. for about 30 minutes. To obtain the filtrate.

In the quantifying step, the filtrate obtained by dissolving in the dissolving step is collected, the Ca ion concentration in the solution is measured according to the procedure described below according to JIS R9101, and finally the Ca component amount converted as CaO is calculated. To get That is, in this quantification step, the filtrate as a sample was transferred to a 500 ml volumetric flask, diluted with water to the marked line, and used as a sample solution for quantification of calcium oxide. First, 2 from the sample solution
Accurately collect 5 ml, put it in a beaker (300 ml), and add water to make about 100 ml. To this, add 2 ml of triethanolamine (1 + 1), add an appropriate amount of potassium hydroxide solution (200 g / l), stir well, and p
Adjust H to 12.7 to 13.2 and let stand for 2-3 minutes. To this solution. Add about 0.1 g of NN indicator and add 0.0
Titration was carried out with a 1 mol / l EDTA standard solution, and a titration step was carried out with the end point being the point at which the color of the solution changed from magenta to reddish and became a clear blue color. In this example,
This titration process is performed by ion titration using an automatic titrator (APB-4
10, KYOTOBLECTRONIC). The content rate of calcium oxide in the sample is calculated, for example, by the following formula. CaO = (v × f × 0.0005608 / S) × (50
0/25) × 100 where CaO is the calcium oxide content (mol%), v
Is the amount of 0.01 mol / l EDTA standard solution used (m
l) and f are 0.01 mol / l EDTA standard solution factor, and S is the mass (g) of the sample weighed.

Table 1 shows the characteristics of the pressurized fluidized bed combustor 10
The measurement result of T-CaO in ash at the time of 00% load driving | operation is shown in comparison with the result by the conventional Ca analysis method based on JIS which melt-processes a sample beforehand. Cyclone ash, E
For P ash, 0.6% each compared to the conventional analysis data,
It can be seen that there is a difference of 3.5%. Although the difference in the case of EP ash is slightly larger than that in the case of cyclone ash,
Since the data of cyclone ash collected on the side closer to _____________________________________________________________________ To be From these results, the reliability of the method for measuring the amount of Ca component in ash in the pressurized fluidized bed combustor 10 was confirmed.

[0015]

[Table 1]

(Example) X-ray diffraction (using an X-ray diffractometer SAD-RB, Rigaku manufactured by Rigaku Denki Co., Ltd.) in order to investigate changes in constituent substances before and after acid treatment in the dissolution step.
I went. FIG. 3A is a chart diagram showing a powder X-ray diffraction pattern of cyclone ash before acid treatment, which is obtained during 75% load operation, and FIG. 3B is a chart diagram after the acid treatment. Pressurized fluidized bed combustor 10
The change before and after the acid treatment was measured using the cyclone ash obtained during the 75% load operation. 75 as can be seen from FIG.
Cyclone ash during% load operation is treated with acid to produce CaCO ₃
The diffraction peak (○) completely disappeared, and the diffraction peak (△), which is probably due to coal ash, was retained. Also,
A diffraction peak, which seems to be a new hydroxide, was observed by the acid treatment. FIG. 4A shows a ceramic tube filter ash (CTF) of a combustion tester different from the pressurized fluidized bed combustor 10.
4 shows a powder X-ray diffraction pattern before acid treatment when ash) is used, and FIG. 4B shows a pattern after the acid treatment. In FIG. 4, the CaO diffraction peak (⊚)
Completely disappeared by the acid treatment, and a diffraction peak (x) of CaSO ₄ was slightly observed even after the acid treatment. Diffraction peaks (Δ) that are considered to be caused by coal ash are retained, and diffraction peaks that are thought to be hydroxides that appear due to the acid treatment and are observed in the ash collected by the pressurized fluidized bed combustor 10 are not observed. I understood.

Table 2 shows the proportion of the amount of Ca component during the 100% load operation and the 75% load operation of the pressurized fluidized bed combustion apparatus 10 for cyclone ash and EP ash. Compared with T-CaO, there are more cyclone ash. Further, when compared in the Ca compound form, EP ash has a high ratio of CaSO ₄ (gypsum) and a low ratio of CaO and CaCO ₃ . As can be seen from the XRD measurement described above, CaO and C were treated by acid treatment before and after acid treatment.
Compared to the complete disappearance of the aCO ₃ diffraction peak, C
The diffraction peak of aSO ₄ remained slightly. From the above,
In the method of measuring the amount of Ca in ash in the pressurized fluidized bed combustor, cyclone ash was considered to be the cause of obtaining higher accuracy than EP ash.

[0018]

[Table 2]

In the method for controlling the pressurized fluidized bed combustor, the coal, limestone, and water supplied to the pressurized fluidized bed combustor 10 are calculated based on the data obtained by the method for measuring the amount of Ca in ash. Composition and supply of fuel slurry,
The supply amount of high-pressure air required to form a fluidized bed of solid particles in the combustion chamber 12 is adjusted. Such control can be performed by the control system or the control device 27 that manages the system of the pressurized fluidized bed combustor 10, thereby preventing abnormal combustion due to changes in the Ca component and blockage of the ash transfer pipe. As a result, the operating state of the pressurized fluidized bed combustion device can be always maintained properly. Further, it becomes possible to effectively reflect the historical data of the amount of Ca component accumulated in the operation of the pressurized fluidized bed combustor.

The method for measuring the amount of Ca component in ash in the pressurized fluidized bed combustion apparatus according to one embodiment of the present invention is configured as described above and therefore has the following effects. (A) Since it has an ash collecting step for collecting ash from the pressurized fluidized bed combustion device 10 at every predetermined period, it is possible to efficiently and quickly obtain the data on the amount of Ca component necessary for grasping the situation in the combustion chamber 12. It can be acquired, and the pressurized fluidized bed combustion device 10 can be appropriately controlled using this. (B) Since the procedure of putting the sample in a platinum crucible and melting and cooling the sample as in the conventional example can be omitted, the amount of Ca component in the ash can be quickly acquired, and the pressurized fluidized bed combustion apparatus 10 can be used. Can respond to changes in operating conditions. (C) Since there is no melting step of the collected sample, automation of Ca component amount measurement is facilitated, abnormal combustion and blockage of the ash transport pipe, etc. are prevented, and the pressurized fluidized bed combustion apparatus 10 is appropriately controlled. It is possible. (D) The ash collected in the ash collection process is cyclone ash or E
Since it is P ash, its particle size and density are smaller than that of ash discharged from the lower part of the fluidized bed, and the components change sensitively to changes in the conditions inside the furnace in the combustion chamber 12. Therefore, by analyzing this, data that accurately reflects the situation inside the furnace can be obtained and input to the control device 27 to contribute to the control of the pressurized fluidized bed combustion device 10. (E) Since Ca ions in the filtrate are titrated using the NN indicator and triethanolamine, the titration operation can be performed in a standardized procedure, which is excellent in reliability and accuracy, and enables efficient measurement work. be able to. (F) Ca of ash collected from the pressurized fluidized bed combustor 10
It is also possible to quickly measure the amount of components and adjust the amount of each of coal, limestone, and high-pressure air supplied based on historical data, so prevent abnormal combustion due to fluctuations in Ca components and blockage of ash transfer pipes. Thus, the pressurized fluidized bed combustion device 10 can be operated properly. (G) Since the combustion state of the pressurized fluidized bed combustor 10 is stably controlled even if the components of the fuel slurry and the like fluctuate, the energy cost and the like can be optimized for operation.
It is highly economical.

[0021]

The method for measuring the amount of Ca component in ash in the pressurized fluidized bed combustion apparatus according to the first aspect of the invention has the following effects. (A) Since it has an ash collection process that collects ash from the pressurized fluidized bed combustor at every predetermined period, it is possible to acquire data on the amount of Ca component necessary for grasping the in-reactor situation that changes moment by moment.
This can be used to properly control the pressurized fluidized bed combustor. (B) Since heating and cooling do not take time, the amount of Ca component in ash can be quickly acquired, and the operating condition of the pressurized fluidized bed combustor can be changed. (C) It is possible to facilitate the automation of the Ca component amount measurement, prevent abnormal combustion and blockage of the ash transport pipe, and appropriately control the pressurized fluidized bed combustion apparatus. (D) Since only the Ca component in the ash is measured,
The data necessary for operating the pressurized fluidized bed combustor can be acquired quickly and efficiently, and the time lag due to the measurement of the Ca component can be reduced.

According to the method for measuring the amount of Ca in ash in the pressurized fluidized bed combustion apparatus according to the second aspect, the following effects can be obtained in addition to the effect of the first aspect. (A) The ash collected in the ash collection process is cyclone ash or E
Since it is P ash, its particle size and density are smaller than that of ash discharged from the lower part of the fluidized bed, and the components change sensitively to changes in the conditions inside the furnace. Therefore, by analyzing this, data that accurately reflects the situation inside the furnace can be acquired, which can contribute to the control of the pressurized fluidized bed combustion apparatus.

According to the method for measuring the amount of Ca component in ash in the pressurized fluidized bed combustion apparatus according to claim 3, the following effects can be obtained in addition to the effect of claim 1 or 2. (A) Since Ca ions in the filtrate are titrated using the NN indicator and triethanolamine, the titration operation can be performed in a standardized procedure, which is excellent in reliability and accuracy, and the measurement work can be performed efficiently. be able to.

According to the method of controlling the pressurized fluidized bed combustion apparatus described in claim 4, the following effects can be obtained. (A) Since the amount of Ca component in the ash collected from the pressurized fluidized bed combustor is measured and the amounts of coal, limestone, and high-pressure air supplied are adjusted based on the historical data, C
It is possible to prevent abnormal combustion due to fluctuations in the component a, blockage of the ash transfer pipe, and the like, and always maintain the operating state of the pressurized fluidized bed combustion apparatus appropriately. (B) Since the combustion state of the pressurized fluidized bed combustor is stably controlled even if the components of the fuel slurry and the like fluctuate, the energy cost can be optimized for operation, and the economy is excellent. (C) C accumulated during operation of the pressurized fluidized bed combustor
Since the historical data of the a component amount can be effectively reflected, various fluctuations can be suppressed and the operation can be performed more easily.

[Brief description of drawings]

FIG. 1 is a block diagram of a pressurized fluidized bed combustion apparatus to which the method for measuring the amount of Ca in ash is applied.

FIG. 2 is a flow chart of a dissolution process in which ash for measurement is dissolved in an acid solution.

FIG. 3 (a) Powder X before acid treatment of cyclone ash
Line diffraction pattern (b) X-ray powder diffraction pattern after acid treatment of cyclone ash

FIG. 4 (a) Powder X-ray diffraction pattern of ceramic tube filter ash before acid treatment (b) Powder X-ray diffraction pattern of ceramic tube filter ash after acid treatment

[Explanation of symbols]

10 Pressurized fluidized bed combustor 11 Pressure vessel 12 Combustion chamber 13 cyclone 14 Fuel slurry pump 15 Ash storage tank 15a sampling device 16 compressor 17 gas turbine 18 generator 19 Steam turbine 20 generator 21 condenser 22 Water pump 23 Flue gas denitration equipment 24 Waste heat feed water heater 25 Electric dust collector 25a Sampling device 26 chimney 27 Control device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G01N 31/16 F23C 11/02 304 31/22 122 F23J 15/00 Z (72) Inventor Yoichi Takahashi Fukuoka No. 1-1 Nagahama-cho, Kanda-cho, Kyoto-gun Kyushu Electric Power Co., Inc. Kanda power plant (72) Inventor Shisho Hirayama 1-1, Nagahama-cho, Kanda-ku, Kyoto-gun Kyushu Electric Power Co., Ltd. (72) Inventor Tatsuro Harada Fukuoka 1-17-8 Shirokane, Chuo-ku, Fukuoka-shi, Japan F-term in West Japan Environmental Energy Co., Ltd. (reference) 2G042 AA01 BC02 CA10 CB06 DA06 DA08 EA01 FA06 FA11 FB03 GA05 3K003 FA03 FB04 FB05 FC04 FC05 GA06 3K064 AA02 AB01 AC05 AC07 AC16 AD05 AE01 AE11 AF03 BA13 BA17 BA24 3K070 DA07 DA29 DA30

Claims (4)

[Claims] 1. An ash collecting step of collecting ash of the fuel slurry from a pressurized fluidized bed combustion apparatus in which a fuel slurry containing coal and limestone is burned in a fluidized bed, and an acid treatment of the ash to dissolve a Ca component. A method for measuring the amount of Ca in ash in a pressurized fluidized bed combustor, comprising: a dissolving step of: and a quantitative step of quantifying a Ca component in the filtrate obtained by dissolving in the dissolving step. 2. The ash collected in the ash collecting step is cyclone ash captured by a cyclone into which exhaust gas generated from the fluidized bed is introduced or EP ash collected by an electrostatic precipitator. The method for measuring the amount of Ca in ash in the pressurized fluidized bed combustor according to claim 1. 3. The quantification step is a titration step in which a NN indicator and triethanolamine are added to the filtrate, and Ca ions in the filtrate are titrated using EDTA. The method for measuring the amount of Ca component in ash in the pressurized fluidized bed combustor according to 1 or 2. 4. The amount of Ca component measured by the method of measuring the amount of Ca component in ash of the pressurized fluidized bed combustion device according to claim 1, and the pressurized fluidized bed combustion device. And the amount of each of the coal and the limestone supplied to the pressurized fluidized bed combustor and the high pressure air that forms the fluidized bed is adjusted. Control method for a pressurized fluidized bed combustion apparatus.