JPS60106720A - Method of detecting clogging in pulverized material gas-stream conveyor device - Google Patents

Abstract

PURPOSE:To rapidly detect the presence and position of clogging, by detecting the supply source pressure of conveying gas, the inside pressure of a pulverized material reservoir, the pressure of a gas-stream conveyor pipe and the inside pressure of a pulverized material consumption reservoir so that the position of clogging is detected in view of differential pressures among the above-mentioned detected pressures. CONSTITUTION:In a gas-stream conveyor system for conveying pulverized materials stored under pressure in a bin 1 to a blast furnance 2, a plurality of take-out ports 21, in the number corresponding to the number of tuyeres 22 in the blast furnance 2, are formed in the bottom surface of the bin 1, and discharge gas pipe lines L1 which are connected independently from each other, are directed to the respective take-out ports 21. Discharge pipes L2 connected respectively to the take-out ports 21 are connected through mixing-tees 20 to conveyor pipes L3. Further, there are provided a bin internal pressure gage 9, a conveying gas source pressure gage 11, conveyer gas pipe line pressure gages 13 through 17, a blast furnance internal pressure gape 18, etc. Detected pressures by the pressure gages 13 through 17 are monitored by, for example, a computer 19 so that the presence and position of clogging by the pulverized materials may be determined in view of variations in the balance of pressures detected by the pressure gages.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for promptly detecting a clogging phenomenon occurring during an air flow conveyance operation of powder and granular materials, as well as the position of the clogging.

The pneumatic transport technology for powder and granular materials itself has been established to some extent, and has been widely applied across various industrial fields.
The technology to accurately and quickly detect the clogging phenomenon that occurs during operation, along with its location, is still undergoing trial and error.1) It must be said that it has not yet been established.

On the other hand, the present inventors have carried out practical research on technology for airflow conveying powder or granular coal to blast furnaces and multi-stage fluidized bed boilers, and have achieved certain results. Through repeated trial and error, we now have to establish accurate and quick detection technology. The present invention was made with attention to such a situation, and
We have established a method that can satisfy the above requirements. That is, the detection method according to the present invention detects blockages t and b in air flow conveyance equipment in which a powder storage container and a powder usage container are connected by air flow conveyance piping. The pressure inside the powder storage container, the pressure at any position in the air flow conveyance piping, and the pressure inside the container where the powder is used are detected, and the location of the blockage is detected from the pressure difference between the detected pressures. This method has the gist as follows. Examples of containers for use of powder and granular materials include the aforementioned blast furnaces and boilers.
Of course, the present invention is not limited to these, and even if the inside of the container is at normal pressure, it is included in the scope of the present invention.

Next, the detection method of the present invention will be explained based on the drawings.

Figure 1 is an explanatory diagram showing the piping concept of a device for airflow conveying pulverized coal stored under pressure in a bin 1 to a blast furnace 2.The bottom of the bin 1 has a number of holes corresponding to the tuyeres 22 of the blast furnace. Exit 2
1 is formed, and exhaust gas piping is connected to each outlet 21 (in case exhaust gas is used, the exhaust gas is fed through the valve 3). A discharge pipe L2 is connected to the outlet of each outlet 21, and this pipe L2 is connected to a transport pipe by a mixing tee 20. Exhaust gas is then supplied in the direction of arrow A along the exhaust gas piping, and the pulverized coal in the bin 1 is accompanied by this gas, piped through the outlet 21, and transported by airflow in the direction of arrow B. and reaches the mixing tee 20. On the other hand, the transport gas flows in the direction of arrow C in the transport pipe Ls, joins with the discharge gas and pulverized coal at the mixing tee 20, and is further transported together with them in the direction of the arrow to the tuyere of the blast furnace 2. It is blown in from 22. In this specification, the exhaust piping 2 and the transport piping L3 are sometimes referred to as air flow conveying piping, and the exhaust gas and transport gas are sometimes referred to as conveying gas. Note that the present invention also includes a case where no exhaust gas is used, and in this case, the exhaust gas pipe L1 is not used.

Now, to explain the pressure gauges used to detect the presence and location of clogging in the air flow conveyance system having the above configuration example, the bottle internal pressure gauge 9, the exhaust gas pressure gauge 1
2 (provided for each individual pipe), source pressure gauge for exhaust gas 10. Original pressure gauge for transport gas 11. A pre-mixing pressure gauge 13 for transport gas and a mixing tee 2 provided in each pipe L3 leading to the mixing tee 20 after the transport gas is branched.
Pressure gauge 14 immediately after mixing for transport gas provided in each pipe line L3 immediately after zero. 15.16-1116-2. Pressure gauges 15.16-1116-2.・・・
...16-3, a pressure gauge 17. installed immediately before each blast furnace tuyere 22; A blast furnace pressure gauge 18 is used respectively.

The pressure detected by each pressure gauge is constantly or intermittently observed visually, by a meter, or by a computer (calculator 19 in the example), and the presence or absence and location of a blockage is determined from changes in the pressure balance detected by each pressure gauge. do. The essence of the present invention will be clarified by further exemplifying the details of the method as follows.

(1) When clogging occurs at the outlet 21: Since pulverized coal will not flow into the piping 21L11 after the outlet 21, the indicated values of the pressure gauges 13.14°15.16.17 Winter wear shows the pressure difference when transport gas flows alone. Further, the pressure gauge 12 of the piping 1 connected to the outlet 21 gives the same detected value as the original pressure gauge 10.

(2) When a blockage occurs in the pipe L2: For the same reason as above, the difference between the readings of the pressure gauges 13.14 and 15°16.17 indicates the pressure difference when the transport gas is flowing alone, A pressure gauge 12 indicates the pressure difference when exhaust gas flows alone.

(3) When clogging 9 occurs in the mixing tee 20: In the line concerned, the mixing tee 2
Since the flow of pulverized coal until it reaches 0 is completely stopped, the pressure gauge 12 shows the pressure difference when the exhaust gas is flowing alone.
The pressure #t I 3 gives the same detected value as the original pressure d[11. Also, the pressure gauge 14.15116°17 shows the same pressure value as the blast furnace pressure gauge 18 since there is no gas flow.

(4) When clogging 9 occurs between the mixing tee 2o and the pressure gauge 14: The pressure gauge 12113 shows the pressure difference when each gas flows individually into the bottle 1, and the pressure gauge 14.15°16 .17 indicates the same pressure value as pressure gauge 18.

(5) When a blockage occurs between pressure 1114 and pressure gauge 15: Pressure gauges 12, 13, and 14 indicate the pressure difference when each gas flows individually into bottle 1, and pressure gauges 15, 16 .17 indicates the same pressure value as pressure gauge 18. This example can be used when clogging occurs before the pressure gauge 17 in the pipeline.

(6) When clogging occurs between the pressure gauge 17 and the tuyere 22: The pressure gauges 12.13114 indicate the pressure difference when each gas flows individually into the bottle 1, and the pressure gauges 15, 16. The indicated value of 17 is the same as the indicated value of pressure gauge 14.

(7) When the outlet 21 and the area immediately before the mixing tee 20 are clogged: The pressure gauge 12 shows the same value as the original pressure gauge 10, and the pressure gauge 1
3.14.15.16.17 shows the pressure difference when the transport gas flows alone.

(8) When the outlet 21 and the inside of the mixing tee are continuously clogged: The pressure gauge 12 shows the same value as the original pressure gauge 10, and the pressure gauge 1
1 and pressure gauge 13 show the same value. Also pressure gauge 14.15.
16.17 indicates the same value as pressure gauge 18.

(9) When the outlet 21 and the rest of the pressure gauge 14 are clogged continuously: The readings of the pressure gauges 11, 12, and 13 are the same as in item (8), and the pressure gauges after the blockage are It shows the same value as pressure gauge 18.

QO) When there is continuous blockage from the tuyere 22 to the pressure gauge 17 and in front of it: Pressure gauges 12 + 13 + 14 indicate the pressure difference when each gas flows alone, as in (5), and the pressure difference before the blockage is Pipeline.

The pressure gauges all show the same value as the pressure gauge 14.

When the 0υ mixing tee 20 and the tuyere 22 are continuously clogged: The pressure gauge 12 shows the pressure difference when the exhaust gas is flowing alone, and the pressure gauge 13 and the pressure gauge 11 show the same value.

The above explanation has been given using specific examples of clogging, but the point is that the pressure indication values before and after the clogging point indicate a value that has collapsed from the pressure balance during steady conveyance, so this can be detected immediately and the details of the change can be determined. By holding it in place, the site where the blockage occurs and its situation can be accurately determined.

When clogging is detected in this way, it is necessary to try to eliminate the clogging force, and since it is thought that the most effective means for doing so is a gas blowing method for the clogging location, this will be explained in a supplementary manner below.

When a blockage is detected, all valves 3+4+5 and 6 in the line where the blockage occurs are closed, and then the exhaust valves 7,
8-1, 8-2, ・Open 8-i and connect piping Ls
Relieve the pressure inside. Then, the exhaust valve 7 located in front of the mixing tee 20 is closed to prepare for gas purging. When clogging occurs between the outlet 21 and the mixing tee 2o, the valves 3 and 4 are opened to supply gas, and the clogged pulverized coal is removed from the exhaust valves (s-i) to ( 8-i)
or in some cases, the exhaust valve (
8-1) to (8-i) are closed and the valve 6 is opened to blow into the blast furnace 2. On the other hand, the clog is mixing tee 2
If the occurrence occurred after 0, open valve 5 and close the exhaust valve (8
-1) to (8-i) or blown into the blast furnace 2.

Once the gas blowing is finished, normal operation can be resumed, but as described above, the present invention is designed to detect multiple clogging positions in the piping by pressure balance.
The occurrence and location of occurrence can be detected accurately and quickly,
It has become possible to prevent the occurrence of troubles in the airflow conveyance of powder and granular materials, thereby increasing the safety of the insect technology and greatly contributing to improving its utility value.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a powder pneumatic conveyance line to which the present invention is applied. 1... Bottle 2... Blast furnace

Claims (1)

[Claims] Packing tb in powder and granule airflow conveyance equipment, which connects the powder and granule storage container to the powder and granule usage container with airflow conveyance piping.
A detection method that includes the supply source pressure of the conveying gas, the internal pressure of the powder storage container, the pressure at any position of the air flow conveying piping,
Also, a clogging detection method characterized by detecting the internal pressure of each container in which the powder or granular material is used, and detecting the clogging location from the pressure difference between the respective detected pressures.