JPH0478481A - Method and device for quality control of coal ash - Google Patents

Abstract

PURPOSE:To confirm the suitability of a quality of a coal ash for shipment and to make unmanned control through day and night continuously available by automatically sampling a coal ash generated from the outlet of electrostatic precipitater to the inlet of the coal ash silo and automatically analyzing the ash with the analytical instruments. CONSTITUTION:The coal ash is sampled automatically from the outlets of the electrostatic precipitaters 1, 1a to the inlets of the silos 3, 4, and this coal ash is packed automatically into a capsule and pneumatically transferred to an analysis room 25 and executing automatic analysis by the analytical instruments 17, 18 and whether coal ash in electrostatic precipitaters 1, 1a or relaying tank 2 is sent to the recovery silo 4 or the waste ash silo 3 is judged. From the result of the property analysis analyzed automatically by analytical instruments 17, 18, the quality of the coal ash for shipment is adjusted by adjusting the condition of the classification treatment by the coal ash classifier 7 in the recovery silo 4. Additionally, referring to the analytical result obtained by automatic analysis using analytical instruments 17, 18, the suitability of the quality of the coal ash in a fine powder silo 6 is ascertained before shipment.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention efficiently recovers a large amount of high-quality coal ash, which is used as a cement admixture, etc., and also carefully controls the quality. method and apparatus for
For more information, see Automatic sampling and analysis of coal ash generated from coal-fired boilers! Coal ash quality is determined by air transporting it to the warehouse and automatically analyzing it with an analyzer to determine whether the quality of coal ash is good or bad, adjust the quality by controlling the classification device, and determine whether the quality of coal ash for shipping is appropriate. This invention relates to a management method and device.

[Conventional technology]

Conventionally, coal ash collected by an electrostatic precipitator of a coal-fired boiler is air-conveyed to a recovery silo or a waste ash silo with or without a relay tank, and the ash in the recovery silo is led to a classification device. A commonly used ash processing method is to separate the ash into coarse powder and fine powder, with the coarse powder being charged into a coarse powder silo and the fine powder into a fine powder silo.

Currently, coal ash is used as an admixture for cement 1, etc.
0% used. When analyzing the coal ash, manually operate the valve installed in the diffuser feeder section under the electrostatic precipitator to sample a small amount of coal ash, transport it by car or foot to the analysis building, and analyze it manually. If the quality is appropriate, the coal ash from the electrostatic precipitator is transported to a collection silo and collected.

Regarding the quality of coal ash for shipping, just before shipping, a small amount is sampled from below the rotary feeder at the bottom of the collection silo or the fine powder silo, and analyzed by i! The products are transported by car or on foot to the store, where they are manually analyzed to determine whether the quality is appropriate.

[Problems to be solved by the invention] Conventional coal ash quality control methods are difficult to solve under conditions such as when the utilization rate of coal ash is low, when the scale of a single power plant is small, when there are few types of coal used, when there are few boiler load fluctuations, etc. Once this is in place, it will be possible to respond by manpower only during the day. however,
Modern coal-fired boiler power plants have become larger, use more types of coal, and fluctuate the boiler load several times a day. Ash quality control must be carried out continuously day and night, which is difficult with conventional methods.

The present invention was developed in view of the above points, and it automatically samples coal ash generated from a coal-fired boiler between the outlet of an electrostatic precipitator and the entrance of a coal ash silo, puts it in a capsule, and transports it by air to an analysis building. By performing automatic analysis with an analyzer, we can judge whether the quality of coal ash in the electrostatic precipitator or relay tank is good or bad, adjust the quality by adjusting the classification device, and collect fine powder from the fine powder outlet of the classification device. An unmanned system running day and night that can determine whether the quality of coal ash for shipping is appropriate by automatically sampling all the way to the entrance of No. 1, putting it in a capsule, pneumatically transporting it to the analysis building, and automatically analyzing it with an analyzer. The aim is to develop an operational coal ash quality control method.

[Means and operations for solving the problem] In order to achieve the second object, the coal ash quality control method according to claim 1, as shown in the drawing, uses an electrostatic precipitator 1.1a of a coal-fired boiler.
The captured ash is air-transferred to a collection silo 4 or a disposal tank 3 through a relay tank 2 7, and the ash from the collection pipe opening 4 is guided to a classification device 7. In the ash processing method of classifying coarse powder and fine powder and feeding the coarse powder into coarse powder silo 5 and the fine powder into fine powder silo B, the ash between the electrostatic precipitator 1.1a exit and silo 3.4 population is Coal ash is automatically sampled, this coal ash is automatically filled into capsules, and transported by air to analysis building 25, where it is loaded into the analysis equipment!
Automatic analysis was performed at +7.18, and from the property analysis results,
It is characterized in that it is determined whether to send the coal ash of electric annual production Il+, 1a or the relay tank 20 coal ash to the recovery silo 4 or to the waste ash silo 3.

Further, the method according to claim 2 provides an electrical collector 11 of a coal-fired boiler.
Machine 1.1a Collected ash is pneumatically conveyed to a recovery silo 4 or a waste ash silo 3 via a relay tank 2 or not, and the ash in the recovery silo 4 is guided to a classification device 7 to be divided into coarse particles. In the ash processing method, which separates coarse powder into coarse powder silo 5 and fine powder into fine powder silo 6, from electrostatic precipitator 1.1a output "" to silo, 3.4 people "] Coal ash is automatically sampled between the chambers, this coal ash is automatically filled into capsules and transported by air to the analysis building 25, and automatically analyzed using the analyzers 17 and 18. Based on the property analysis results, the It is characterized in that the quality of coal ash for shipping is adjusted by adjusting the classification operation conditions by the coal ash classification device 7.

Furthermore, 7, the method of claim 3 provides an electric
, W machine 1.1a Ura collected ash is pneumatically conveyed to a collection silo 4 or a sacrificial tenyogo Iro 3 through or without a relay tank 2, and the ash in the collection silo 4 is guided to a classification device 7. In the ash processing method, the coarse powder is classified into coarse powder and fine powder, and the coarse powder is charged into the coarse powder silo 5 and the fine powder is charged into the fine powder silo 6. Coal ash is automatically sampled between
7.18, automatic analysis is performed, and based on the property analysis results, it is determined whether the properties of the coal ash in the fine powder silo B are appropriate before shipment.

In the method of claim 4, in the method of claim 1.2 or 3, the automatically sampled coal ash is analyzed using an analyzer 17.18.
It is characterized by the automatic filling of capsules after temporary storage for connection with the capsules.

The coal ash quality control device according to the fifth aspect of the present invention includes an air flow transport pipe 23.
In the ash processing device, a collection silo 4 and a waste ash silo 3 are connected via a ash processing device 23a, and a coarse powder silo 5 and a fine powder silo 6 are connected to the lower part of the recovery silo 4 via a classifier 7. An automatic sampling device W8.8a, 1 is installed at the lower part of the electric collector 1.1a or the air flow transport pipe 23.23a, and at the fine powder outlet of the classifier W7 or the fine powder silo 6 population.
1, and the automatic sampling device and analyzer I7.
18 are connected to each other via a sample transport tube 26.

Analyzers 17.18 typically have 1. One is an ignition loss measuring device and the other is a particle size distribution measuring device 6 Automatic sampling device 8.8a, 11 is a sampling vibrator with one or more holes drilled into the powder transport pipe. A structure is used in which powder is sucked into a powder collection container through a sampling vibrator.

As the capsule sending device 10110a, 13, after putting the coal ash from the storage device 9.9a, 12 into the cylindrical capsule, the capsule is rotated about 25 degrees (
A known construction is used which is configured to have a screw-on lid (tilted) and be inverted to deliver the capsule containing coal ash to the capsule receiving device 16 using pressurized air. All these operations are performed automatically.

As the material of the capsule, a metal to which less coal ash adheres is used, and brass is particularly suitable.

- As the time storage devices 9.9a and 12.28, a plurality of cylindrical containers are connected in the circumferential direction of the rotating disk, the bottom of which opens and closes with an air cylinder, etc., and the rotating disk is received with the bottom of the cylindrical container closed. This is a known structure in which the cylindrical container is received at a position, and when it is discharged, a rotating disk is rotated to bring the cylindrical container to the discharge position 1, and the bottom is opened with an air cylinder or the like to discharge the coal ash. things are used.

As the capsule receiving device i6, conversion equipment W, 1
4b receives the capsule with the lid on top, rotates it about 25 degrees (tilts it), removes the lid, inverts it and discharges the coal ash into the two-part compartment 219, then inverts it, closes the lid, and removes the lid. 2
A known structure configured to rotate (tilt) 5 degrees and send pressurized air to the capsule sending device 10.10a, T:5 is used.

As the conversion device 1[+4.14a, 14b, a known structure in which the direction of the pipe is changed by a drive device such as an XT cylinder and connected to another vibrator is used.

The two-splitting device 19 is a device that automatically splits the coal ash discharged from the capsule receiving device 16 into two and supplies it to the two analyzers 17 and 18. At least 16 (even number) grooves are opened at the front and rear pitches, and a bisection device (known in JIS M 8811) is connected to which these grooves are alternately divided into two chutes, and these chutes are connected to This is a g position with a working distributor connected.

Further, as the classification device 7, a dry wind type type, such as a gravity type, an inertial force type, or a centrifugal force type, is used.

Note that normally, as shown in FIGS. 1 and 2, the -time storage devices 9.9a and 12 are automatic sampling devices W8.8a.
, 11, but when the sampling cycle is long, the -time storage device 27 is arranged to be installed immediately before the analyzer I7.18, as shown in FIG.

The method and apparatus of the present invention perform the following quality control.

(1) Determining whether or not electric dust machine ash can be used as a product: After automatically sampling the ash from the lower part of the pneumatic transport pipe 23, 23a or the electrostatic precipitator at, 1a, automatic analysis (ignition loss measurement, particle size distribution measurement ), and if the ash is of good quality, send it to collection silo 4△.

(2) Judging the degree of adjustment of the quality of electrostatic precipitator ash: If the average particle size of the ash automatically sampled from the lower part of the airflow transport pipe 23.23m or the electrostatic precipitator rtxmr, 1a is outside the appropriate value, the classification device 7 Adjust the rotation speed to obtain an appropriate average particle size.

(3) Improving the accuracy of product quality assurance: After automatic sampling from the fine powder collection line of the classifier 7, automatic analysis is performed to improve the accuracy of product quality assurance.

Therefore, it is possible to cope with the increasing size of coal-fired boiler power plants, the use of multiple types of coal, and the fluctuation of boiler load several times a day, and to efficiently recover as much high-quality coal ash as possible. Coal ash quality control methods can be provided. Furthermore, in the method of the present invention, a large number of samplings and analyzes can be carried out in a short period of time, so that the quality of coal ash is highly accurate and the combustion state of the boiler can be monitored as a hunk.

C Embodiment] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, unless there is a specific description, the shapes of the components described in this example, their relative positions, etc. are not intended to limit the scope of the present invention to these, but are merely illustrative examples. Only.

Embodiment 1 FIG. 1 shows an embodiment of the coal ash quality control apparatus of the present invention, in which a relay tank 2 is installed.

An example in which the coal ash quality control method of the present invention was applied to a 700,000 coal-fired power plant will be explained below based on Figure 1.6 As an example, two electrostatic precipitators Il+ and 1a From position A (or C) of airflow transport pipe 23.23a, automatic sampling = ZS, 8a - As an example, coal ash from two representative chambers of electrostatic precipitator s1.1a consisting of 16 chambers is 20
After sampling 00m+ and reducing it to 2001 each, the excess coal ash is returned to the airflow transport pipe 23.23a,
The coal ash for analysis is temporarily stored in the storage device 9.9a, and when both the analysis device 17 (ignition loss measurement device) and the analysis device 18 (particle size distribution measurement device) become capable of measurement, the coal ash is temporarily stored in the storage device 1f9. Capsule sending device 10 for coal ash 9a
, into a capsule using IDa, and immediately pneumatically conveyed to the capsule receiving device t+6 and divided into two devices 19.
The coal ash is transferred to the tank and analyzed using an analyzer 1F17.18.

If the amount of strong 2H in the sampled ash is less than 3wt%,
The coal ash in the electrostatic precipitator 1.1a or the coal ash in the relay tank 2 is conveyed by air to the collection silo 4, and the ignition loss is 3 for each.
If it is more than wt%, it is air conveyed to the silo 3 for waste ash.

In addition, if the total particle ratio of the two sampled ash is 74 μm or more and less than 20%, then 1, and if the product is coal ash from recovery silo 4 and is 1.20% or more, then the classification operation
The rotational speed of the classifier 7 is adjusted according to the proportion of particles larger than 74 μm, so that the proportion of particles larger than 74 μm in the fine powder is less than 20%.

Furthermore, from the position B (or D) of the fine powder transport pipe of the classification device 7, the automatic sampling device 11 collects 200 pieces of coal ash.
When both of the analyzers 17 and 18 are able to sample, store in the -time storage device 12 and measure, the -time storage device 1
The coal ash from Step 2 is put into a capsule using the capsule sending device 13, and immediately transferred to the capsule receiving device 16.
The coal ash is transported by air to the bisecting device 19, and analyzed using the analyzer 17.18 to determine that the ignition loss of the fine powdered coal ash for shipping is less than 3 wt%, and the proportion of particles of 74 μm or more is fl that it is less than 20%! I approve.

The above-described coal ash quality control method using continuous unmanned operation day and night makes it possible to efficiently collect as much coal ash as possible with excellent quality.

In addition, as the classification device 7, the case where a dry centrifugal type device is used is shown.

In FIG. 1, 14.14a and 14b are conversion devices, 1
5.20.20a, 21.22 are blowers for airflow conveyance,
24 is an air slider, 26 is a sample transport tube, 27.2
7a is a surplus coal ash return pipe.

Embodiment 2 In this example, as shown in Fig. 2, coal ash carried by airflow from the electrostatic precipitator 1.1a is directly fed into the recovery silo 4 or the waste ash silo 3 without using a relay tank. It is configured to do so.

The other configurations are the same as in the first embodiment.

Embodiment 3 As shown in FIG. 3, in this example, in order to be applied when the sampling cycle is long, the -hour storage device 28 is installed immediately before the analyzer 17, 18, and the automatic sampling device 8 is installed.
, 8a, and 11, the temporary storage device is omitted.

The other configurations are the same as in the first embodiment or the second embodiment.

〔Effect of the invention〕

Since the present invention is configured as described above, it achieves the following effects.

(1) Determination of quality of coal ash 1 By adjusting the quality by controlling the classification device and ensuring that the quality of coal ash for shipping is appropriate, it is possible to control the quality of coal ash by continuous unmanned operation day and night.

(2) Larger coal-fired power plants, use of multiple types of coal,
It can respond to boiler load fluctuations that occur several times a day, and can efficiently recover as much high-quality coal ash as possible.

(3) Since a large number of samplings and analyzes can be performed in a short period of time, the quality of coal ash is highly accurate, and it is possible to back up the monitoring of the combustion status of the boiler.

[Brief explanation of drawings]

FIG. 1 is a system flow diagram showing one embodiment of the coal ash quality control apparatus of the present invention, and FIGS. 2 and 3 are system flow diagrams showing other embodiments of the apparatus of the present invention. A, B, C, D... Coal ash sampling position, ], 1
a... Electrostatic precipitator, 2... Relay tank, 3... Silo for discarded ash, 4... Silo for collection, 5... Coarse powder silo, 6... Fine powder silo, 7...・Classifying device, 8.8
a...Automatic sampling device, 9.9a...-time storage device, 10.10a...capsule sending device, 11...automatic sampling device, 12...-time storage device, 13...・Capsule sending device, 14,
+4a, +4b... conversion device, 15... blower, 1
6... Capsule receiving device, 17... Analyzer (ignition loss measuring device), 18... Analyzer (particle size distribution measuring device), 19... Bisection device, 20.20a,
21.22...Blower, 23.23a...Air flow transport pipe, 24...Air slider, 25...Analysis building, 2
6...Sample transport pipe, 27.27a...Surplus coal ash return pipe, 28...-hour storage device Applicant: Kawasaki Heavy Industries, Ltd. Applicant: Chubu Electric Power Co., Ltd.

Claims (1)

[Claims] 1. Collecting ash from an electrostatic precipitator (1, 1a) of a coal-fired boiler, with or without a relay tank (2), into a recovery silo (4) or a waste ash silo (3) The ash in the collection silo (4) is guided to the classifier (7) and classified into coarse powder and fine powder.The coarse powder is transferred to the coarse powder silo (5), and the fine powder is transferred to the fine powder silo (5). 6), coal ash is automatically sampled between the outlet of the electrostatic precipitator (1, 1a) and the entrance of the silo (3, 4), and this coal ash is automatically filled into a capsule and sent to the analysis building ( 25), automatic analysis is performed using analyzers (17, 18), and based on the property analysis results, the coal ash in (1, 1a) or the coal ash in the relay tank (2) is collected by electrostatic precipitator. A coal ash quality control method characterized by determining whether to send to a silo (4) or to a waste ash silo (3). 2 The ash collected by the electrostatic precipitator (1, 1a) of the coal-fired boiler is conveyed by air to the collection silo (4) or waste ash silo (3) via or without the relay tank (2), and collected. The ash in the silo (4) is led to the classifier (7) and classified into coarse powder and fine powder, and the coarse powder is fed into the coarse powder silo (5) and the fine powder is fed into the fine powder silo (6). In the processing method, coal ash is automatically sampled between the outlet of the electrostatic precipitator (1, 1a) and the entrance of the silo (3, 4), and this coal ash is automatically filled into a capsule and transported by air to the analysis building (25). , automatic analysis is performed using analyzers (17, 18), and based on the property analysis results, the coal ash classification device (7) in the recovery silo (4)
A coal ash quality control method characterized by adjusting the quality of coal ash for shipping by adjusting classification operation conditions. 3 The ash collected by the electrostatic precipitator (1, 1a) of the coal-fired boiler is conveyed by air to the collection silo (4) or waste ash silo (3) via or without the relay tank (2), and collected. The ash in the silo (4) is led to the classifier (7) and classified into coarse powder and fine powder, and the coarse powder is fed into the coarse powder silo (5) and the fine powder is fed into the fine powder silo (6). In the processing method, coal ash is automatically sampled between the fine powder outlet of the classification device (7) and the fine powder silo (6) entrance, and this coal ash is automatically filled into capsules and transported by air to the analysis building (25). A coal ash quality control method characterized in that automatic analysis is performed using analyzers (17, 18), and based on the property analysis results, it is determined whether the properties of the coal ash in the fine powder silo (6) are appropriate before shipment. . 4 The automatically sampled coal ash is analyzed using an analyzer (17,
18) The method for quality control of coal ash according to claim 1, 2 or 3, characterized in that the coal ash is automatically filled into capsules after being temporarily stored for cooperation with the coal ash. 5 A collection silo (
4) and a waste ash silo (3) are connected, and a coarse powder silo (5) and a fine powder silo (6) are connected to the lower part of this collection silo (4) via a classifier (7). In the device, an automatic sampling device (8) is installed at the lower part of the electrostatic precipitator (1, 1a) or the air flow transport pipe (23, 23a), and at the fine powder outlet of the classifier (7) or the fine powder silo (6) inlet.
, 8a, 11), and the automatic sampling device and the analysis device (17, 18) are connected via a sample conveyance pipe (26).