JPS6245308A - Apparatus for collecting fine powdery coal - Google Patents

Abstract

PURPOSE:To make it possible to gather and distribute fine powdery coal in a storage process, by providing a large number of air jet nozzles above bag filters and dividing said nozzles into groups each comprising the required number of the nozzles to inject air at every group. CONSTITUTION:A fine powdery coal stream is flowed in a lower chamber 7 and carrier gas is exhausted from the exhaust pipe 8 of an upper chamber 6 to adhere fine powdery coal to the under surfaces of bag filters 5. When the adhesion amount of fine powdery coal reached a required amount, compressed air is successively injected from all of nozzles 10 so as to be directed from the upper surfaces of the bag filters 5 to the lower surfaces thereof while fine powdery coal is fallen to the lower part of the lower chamber 7 to be fallen to bins 14, 15, 16 from rotary feeders 11, 12, 13. The coal storage levels of the bins 14, 15, 16 are monitored by level detectors 17, 18, 19 and the injection of air from the nozzles 10 is controlled so as to always set said levels to a definite range and a necessary amount is sent to combustion burners 22, 23, 24.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for collecting pulverized coal that is caught between a mill that crushes coal into pulverized coal and a pulverized coal combustion equipment. I'll go.

[Prior art] Conventionally, when supplying pulverized coal as fuel to a pulverized coal combustion equipment, the coal is pulverized by a mill and the pulverized powder is directly fed to the pulverized coal burner. 3. Normally For pulverized coal combustion equipment, fine □)'' fractionation is now supplied from multiple mills, and each mill is equipped with four pulverized coal burners, and the load status of the combustion equipment is Therefore, each mill has to adjust the amount of pulverized coal provided depending on the burner provided during combustion. A change in the load status of the mill (one rule change, in which case some of the mills are put into operation (correction)).

[Problems that the invention is trying to solve] However, in the above-described conventional method, the response of the mill is poor and the supply of pulverized coal cannot be made to follow changes in combustion conditions. .

In view of these circumstances, the present invention compensates for the poor responsiveness of the mill by allowing it to be operated without connection between the mill and the burner, allowing it to quickly respond to changes in combustion conditions, and preventing overstorage. The purpose is to provide a pulverized coal collection device that can perform the rod-C collecting and distributing function.

: Means to solve the 511 points] 4 (Tsumei divides the pulverized coal collector into 11 parts by a bag filter, and prevents the fine coal flow from flowing into the royal house. At the same time, it is made into a single ball that exhausts air from the top, and a large number of air jetting nozzles are installed on the 4th side of the hang filter, and the nozzles are divided into 4 main parts and each group is made into a child that blows out air. In addition, the bottom part of F is formed into a plurality of reversed phase shapes to function as extractor for pulverized coal, which is referred to as 1-f fine.

If air is ejected from the nozzles in each group, fine (4) charcoal will be collected in the area corresponding to the nozzle range of each group.
It is possible to redistribute the pulverized coal depending on the correspondence between each group and the inverted conical shape.

l Implementation example] DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a detailed description of the present invention with reference to the drawings.

The pulverized coal that is pumped from the 33 mills (not shown) to the conveying medium 1 is transferred via transport pipes 1 and 2.3 to the micro-separation collector 11) a. I'm nervous. Pulverized coal collector 4
The inside of the chamber is filtered through a hang filter 5 to remove the upper chamber 6 and the F stenosis 7.
It is necessary to connect the square and wind pipe 8 to the seventh part 6, and connect the transport pipes 1, 2, and 3 to the upper part 7. In the upper chamber 6, piping 9 communicating with a compressed air source is arranged in a grid pattern, and the piping 9 has a large number of nozzles 10, for example, 9 rows (1, 2 ,・8.9>, 9 columns (a,
b, -...h, i) Cover the arrangement. In addition, the lower part of the upper and lower parts 7 (required number, in the figure, it is formed in the inverse 111 shape of 3, and the top of each F is provided with [l-tally figure 11.12.13, and the row feeder 11.12.13 is Bin 14, 15.1
6 are connected and provided. Level detectors 17, 18, and 19 are installed in each bin 14, 15, and 16 to detect and cool down the coal storage level, and the detection results from the level detectors 17, 18, and 19 are input to the controller ?O. Based on the detection results from the level detectors 17, 18, and 19, the controller 20 blows out compressed air from the required number of nozzles at the required locations.The controller 20 controls the opening and closing of valves (not shown). Koira 21 no Moe 2
Burners 22, 23, and 24 are installed on the lower side wall in three stages, and the burners in the ■stage? 2 and bottle 14, middle burner?
3 and bottle 15, upper burner 24 and bottle 16 and 4, each 3υ tube? Connect by 5.76, 27.

Next, the operation of the above coupled device will be explained.

Lifting platform (each burner 22, 23゜21
1 minute i'! l) Explain m consumption rate [Yatai which is the same as Banquet].

[B) The coal from the mill 3 that does not accept water flows into the failure 7 together with the lfG air supply, and the coal and air are separated by the hang filter 5, and the coal is collected by the hang filter 5. 1" is placed on the bottom surface of the hanging filter 5, and air is discharged from the exhaust filter 8. When the required amount of charcoal is reached, (Target) (The nozzle 10 sequentially injects compressed rice air from the top to the bottom of the bag filter 5. The air injection from the nozzle causes a slight
/l') The charcoal falls to the lower part of the upper and lower parts 7 and is collected. The rock feeders 11, 12, 13 allow the pulverized coal to fall into the bins 14, 15, 16 without making the inside of the pulverized coal collector 4 airtight.

111. 15. 16 t+; 'charcoal shield detector] 7° 18. 19 i is being monitored by this,
Air is ejected from the nozzle 10 under the condition that the level is always within a certain range.

Next, we will discuss and discuss the lifting platform that was operated under partial load.

Part 9 load, for example, combustion of the upper stage burner 24 is all F♀ stopped, and the middle stage burner? If part of the pulverized coal is burned in step 3, the level of pulverized coal in bin 16 does not change, and the rate of decrease in the level in bin 15 is slower than that in bin 14.

In such a state, the level change is detected by the level detector 17.18.
It is detected by the signal when it exceeds the level change force Fukudoyo range, or l+'! t] I device? It is input to O. When a signal is input, compressed air is ejected from the nozzle above the bottle corresponding to the signal. For example, when a signal is sent to the bin 14, compressed air is ejected from the nozzle groups in rows 1 to 3 and columns a to i, and pulverized coal is collected only in the bin 14.

When pulverized coal in the range of rows 111 to 3, a Jl to column 1 falls, the air passes through that part of the bag filter 5 better (the collection effect increases), and the coal in the range shines in other parts, causing a small amount of coal to It is done for 1 minute.

Therefore, depending on the amount of pulverized coal in bins 14 and 15,
By jetting air from the nozzles in the required range, it is possible to replenish pulverized coal into the desired bin.

In the case of partial load operation [Depending on the required supply amount of pulverized coal, the load factor of the mill is reduced or the necessary number of mills are stopped, but when shifting to full load operation, there is a delay in the start-up of the mill, etc. On the other hand, the only solution is to increase the supply amount to the required amount under full load conditions, but the transient 1V of the mill and follower will cause a slight amount of "0" coal to accumulate in bins 14 and σ15 up to a predetermined level. The shortage can be made up with this reservoir.

Therefore, with this device, it is possible to compensate for poor follow-up on the mill side when there is a slight increase or decrease in coal consumption on the burner side.

In addition, between the bags, the collection of pulverized coal is carried out by blowing out air from the opposite direction to the bag filter, but the blowing mode is set to Pulse Jiera 1, and the pulse frequency is changed overall or locally. It's okay.

Furthermore, the inside of the pulverized coal extractor 4 is divided into sections corresponding to each mill.
In other words, the nozzles a to C row M, d to L row group,! −1′″−,
-h 9 Jl signal) corresponding to the mill ^] 1 and each mill has separate requirements for ゛c column AY, 1~
3bd to l-row AY, 1 to 311g to 1st row +j'f, 4
~61-(a he = column c to d, rows 4 to 6 d to column L y
, 4 to 611g to 1st column iif, 7th to 9th row a-C column 11i, 7''-9 (T d to f t'J I'+T, to 7・9th row g to 1st column f', T If the pulse frequency of the pulse jet is changed every Y for each of the 9 livers υ1 and 2, it is possible to mix coal as desired for each bin 14, 15, and 16.

As described above, according to the present invention, the fine charcoal separated by the bag filter is redistributed according to the coal storage level of each bin, so the difference in consumption type in the burner is eliminated. Regardless, the coal storage level is always maintained at a predetermined level, eliminating the constraints of mutual interaction between the mill and burner, increasing operational freedom.

[Brief explanation of the drawing]

Fig. 1 (plane diagram of the embodiment of the present invention!
FIG. 4 indicates a small collector, 5 indicates a bag filter, 6 indicates a chamber, 7 indicates a lower chamber, 9 indicates piping, and 10 indicates a nozzle. 11th edition applicant Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) The pulverized coal separator is divided into an upper chamber and a lower chamber by a bag filter, and the pulverized coal flow is made to flow into the lower chamber and air is exhausted from the upper chamber, and a large number of air jet nozzles are installed above the bag filter. The nozzle is divided into a required number of groups so that air is ejected from each group, and the lower part of the lower chamber is formed into a plurality of inverted cone shapes so that pulverized coal can be collected. Pulverized coal collection device.