JP2727394B2 - Pipe cleaning system for wet dust collector of converter exhaust gas treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cleaning system for a wet dust collector of a converter exhaust gas treatment facility.

[0002]

2. Description of the Related Art A wet dust collector of a converter exhaust gas treatment facility is configured to spray and spray water over the entire flow path cross section of the converter exhaust gas cooled by a cooler and contact the exhaust gas with the dust. Is to be removed. Dust collection water containing a large amount of dust removed by this wet dust collector is discharged from the bottom of the wet dust collector, flows through a long pipe of 200 m inside a steelmaking plant indoors, and further flows through a long trough outdoors and coarsely. Dust collected from the coarse separator is introduced into a thickener to separate dust, and clean water is stored in a dust collecting tank. And it is offered for reuse.

When dust collection water 2 flows through an indoor pipe 1 shown in FIG. 5A of a steelmaking plant, dust 3 adheres to the inner surface of the pipe 1 as shown in FIG. c,
As shown by d and e, the sediment grows and grows with time, and finally, the pipe 1 is clogged and leads to blockage. Even if dust collecting water containing a large amount of dust flows through the outdoor trough and dust adheres and accumulates on the inner surface of the trough, the upper part is open.
It is easy to remove and remove dust, but indoor pipes are closed-section pipes, that is, circular pipes so that harmful exhaust gas (CO gas) caught in the dust collection water is not released.
It is troublesome to remove and remove the dust deposited and deposited as described above. In particular, although the length is as long as 200 m, there are ten vents in the middle of the circular pipe, which is extremely troublesome.

Conventionally, in order to remove dust adhering and accumulating on the inner surface of the indoor pipe, the operation of the wet type dust collector is interrupted,
In other words, since the converter operation was stopped, the pipes were cut off from the flange, disassembled, and dust was cleaned manually,
It took time and labor, and the workability was extremely poor.

Further, a so-called pig cleaning in which a hard urethane foam pig is driven into a pipe to remove adhered and deposited dust (so-called pig cleaning (for example, see Japanese Utility Model Publication No. 55-3726).
No. 7 or JP-A-53-79770. )
However, the driven pig stagnated in places where there was a large amount of dust and accumulated at the bend, often did not move even if the pumping pressure was increased, and because it was made of a material that did not respond to the detector In the event of a stagnation, the pigs were removed by cutting the piping, and the pigs are not currently cleaned.

[0006] In addition, it is conceivable to use a compressed air jet cleaning method used for cleaning water pipes and the like. However, this method is a method in which the water pipe is filled with water (as a prior art document, Japanese Patent Publication No. Sho 50 No. 37461 is disclosed.)
Therefore, in the case of the pipe 1 through which the dust collection water 2 flows as shown in FIG. 5A, the compressed air escapes in the upper gap in the pipe 1, so that the dust 3 cannot be separated. For this reason, it is conceivable to inject compressed air into the dust collection water 2 from the lower side of the pipe 1. However, it is necessary to drain water from the nozzle when the compressed air is injected, and the nozzle is clogged with dust. Can not.

[0007]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the pipes can be cleaned even during operation of the dust collector, the pipes can be reliably cleaned even if the pipes are not full, and the pipes can be cleaned automatically without manual operation. An object of the present invention is to provide a pipe cleaning system for a wet dust collector of a converter exhaust gas treatment facility.

[0008]

Means for Solving the Problems One of the pipe cleaning systems of the wet dust collector of the converter exhaust gas treatment equipment according to the present invention for solving the above-mentioned problems is a wet dust collector of the converter exhaust gas treatment equipment, which is provided with a waste gas collector. The compressed gas is blown out instantaneously into the long pipe through which the dust collected by collecting the dust inside flows, and the flow of the water is rapidly accelerated, and at the same time, the water and the water are mixed, forming a very turbulent and intense flow. Causing hammering in the piping,
A large number of pipe cleaning devices are installed at a certain pitch to apply an impact to the entire pipe and remove dust adhering to the pipe due to the impact, and install these pipe cleaning devices downstream of the pipe in accordance with the operation pattern of the wet dust collector. Automatically operate in order from the side,
The inside of the pipe is cleaned.

Another one of the pipe cleaning systems of the wet dust collector of the converter exhaust gas treatment equipment according to the present invention is a wet dust collector of the converter exhaust gas treatment equipment, which collects dust collected in the exhaust gas. In a long pipe that flows, a compressed gas is instantaneously blown out to rapidly accelerate the flow of water, and at the same time to form a water-water mixture, to form a very turbulent and violent flow and to cause hammering in the pipe, A large number of pipe cleaning devices that apply an impact to the whole and remove dust adhering to the pipe due to the impact are installed at a certain pitch, and an electromagnetic current meter is provided downstream near each pipe cleaning device. Is connected to the washing control device, and the amount of dust adhering to the pipe is detected by measuring the flow velocity.
The cleaning time or the interval between the pipe cleaning devices is determined by reaching a predetermined dust adhesion amount, and the required pipe cleaning devices are automatically operated sequentially from the downstream side of the pipe to clean the inside of the pipe. .

[0010]

According to one of the pipe cleaning systems of the wet type dust collector of the converter exhaust gas treatment equipment of the present invention described above, a certain pitch is applied to a long pipe through which dust collected in the exhaust gas flows. By operating a number of installed pipe cleaning devices sequentially from the downstream side during non-blowing, compressed gas is spouted instantaneously from each pipe cleaning device, and the flow of water is rapidly accelerated, When mixed, it becomes a dynamic pressure of a very turbulent and intense flow, which is converted into velocity energy, and this high pressure becomes a pressure wave in the pipe, and when bubbles move at high speed in the pipe, hammering occurs. A shock wave is generated in the pipe,
As a result, the dust adhering to the inner surface of the pipe is peeled off, flows and is discharged together with the turbulent collected water, and the inside of the pipe is cleaned.

According to another aspect of the present invention, there is provided a pipe cleaning system for a wet dust collector of a converter exhaust gas treatment facility, wherein a certain pitch is provided in a long pipe through which dust collected in the exhaust gas flows. The flow velocity of the collected water flowing in the piping is measured by the electromagnetic flowmeters located downstream of the many pipe cleaning devices installed at the site, and the flow speed increases with time due to the adhesion of dust, and the flow speed is sent to the cleaning control device. When the amount of dust attached is detected and the amount of dust attached reaches a predetermined amount, a signal is sent from the washing control device to the required pipe washing device, which is sequentially operated from the downstream side so that the compressed gas is released. As described above, a shock wave is generated in the pipe as described above, whereby the dust adhering to the inner surface of the pipe is separated, the turbulent flow is discharged together with the dust collection water, and the inside of the pipe is washed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a pipe cleaning system for a wet dust collector of a converter exhaust gas treatment facility according to the present invention will be described. In the wet dust collector 5 of the converter exhaust gas treatment equipment shown in FIG. 1, water is sprayed and sprayed over the entire flow path cross section of the converter exhaust gas cooled by an upstream cooler (not shown) and flowing therethrough. As shown in FIG. 2, a 200 m long pipe 1 inside a steelmaking plant at a pitch of 20 m is used to discharge the dust collected from the exhaust gas from the bottom of the wet dust collector 5 by contacting and collecting the dust in the exhaust gas. The pipe cleaning device 6 is installed in the first place. The pipe cleaning device 6 is opened in the compressed gas jet tank 7 and the dust collection water 2 that is connected to the tank 7 and is inserted through a guide port 8 on the upper side of the pipe 1 and inclined in the flow direction of the dust collection water. Each of the tanks 7 is connected to a compressed gas supply pipe 11. The compressed gas supply pipe 11 is composed of a compressed gas ejection pipe 9 and an automatic valve 10 provided in the middle of the compressed gas ejection pipe 9.

However, these pipe cleaning devices 6 are automatically operated in order from the downstream side of the pipe 1 during non-blowing according to the operation pattern of the wet dust collector 5. That is, the converter exhaust gas is generated as shown in FIG. 3A during the blowing operation of the converter operation, and the amount of dust contained in the dust collection water obtained by collecting the dust in the converter exhaust gas by the wet dust collector 5 is reduced. As shown in FIG. 3 b, by selecting the time when it becomes zero in the latter half during the non-blowing and operating and opening the automatic valves 10 of the respective pipe cleaning devices 6 sequentially from the downstream side of the pipe 1, A compressed gas, in this example, compressed air, is ejected from the tank 7 of each pipe cleaning device 6 through a compressed gas ejection pipe 9 instantaneously, and the flow of water is rapidly accelerated, and at the same time gas-water mixing is performed. It becomes a dynamic pressure of a violent flow that is disturbed, and is converted into energy of speed. This high pressure becomes a pressure wave in the pipe 1, and when bubbles move in the pipe 1 at high speed, a hammer ring occurs and the pipe 1 A shock wave is generated, and as a result, dust 3 adhered to the inner surface of the pipe 1 (FIG. 5)
B) is separated and flowed and discharged together with the turbulent dust collection water 2 to clean the inside of the pipe 1.

Next, another embodiment of the pipe cleaning system of the wet dust collector of the converter exhaust gas treatment equipment of the present invention will be described. Wet dust collector 5 of converter exhaust gas treatment equipment shown in FIG.
A long pipe 1 of 200 m inside a steel mill inside a steel mill that discharges and flows dust collected from the exhaust gas from the bottom of
As shown in FIG. 4, the same pipe cleaning device 6 as in the above embodiment is installed at a pitch of 20 m. An electromagnetic flow meter 12 is provided downstream of the pipe cleaning device 6 and connected to a cleaning control device 13. This cleaning control device 13
A determination unit 14 for determining a predetermined dust adhesion amount based on a change in flow velocity from an electromagnetic current meter 12, a setting unit 15 in which a cleaning timing or an interval of the pipe cleaning device 6 is set in advance by the dust adhesion amount, 15 and the amount of dust adhering from the determination unit 14 are calculated, and
Calculation / signal output unit 16 that issues an open / close signal to the automatic valve 10
It consists of

In this pipe cleaning system, however, the pipes 1 are controlled by the electromagnetic current meters 12 downstream of each pipe cleaning device 6.
The flow velocity of the collected water flowing through the inside is measured, the cross section of the flow path in the pipe 1 is reduced with the lapse of time due to the adhesion of dust, and the flow velocity increases, and the flow velocity is sent to the determination unit 14 of the cleaning control device 13. The amount of dust adhering is detected, and the detected amount of adhering dust is sent to the calculation / signal output unit 16 where the setting unit 15
Is compared with the amount of dust adhering to the cleaning timing or the interval between the pipe cleaning devices, which has been sent in advance, and when it is detected that the amount of adhering dust has been reached, the operation / signal output unit 16
From the downstream side of the pipe 1, signals are sequentially sent to the automatic valve 10 of the required pipe cleaning device 6 to be activated and opened. As a result, compressed air is instantaneously ejected from the tank 7 of the required pipe cleaning device 6 through the compressed gas ejection pipe 9, and the flow of water is rapidly accelerated, and at the same time gas-water mixing is caused, which is very disturbed. It becomes a dynamic pressure of a violent flow and is converted into velocity energy. This high pressure becomes a pressure wave in the pipe 1, and when the bubbles in the pipe 1 move at high speed, a hammer ring is generated and a shock wave is generated in the pipe 1. As a result, the dust 3 (see FIG. 5B) attached to the inner surface of the pipe 1 is peeled off, and the inside of the pipe 1 is cleaned.

In this pipe cleaning system, the pipe 1 is cleaned when a certain amount of dust adheres to the inner surface of the pipe 1. Therefore, the cleaning time is set at every charge of the converter operation as in the pipe cleaning system described above. Rather than being performed in the latter half of non-blowing, it is carried out in the latter half of non-blowing every few charges of converter operation. The pipe cleaning device 6 may be a part of a large amount.

[0017]

As described above, according to the pipe cleaning system of the wet dust collector of the converter exhaust gas treatment equipment of the present invention, the pipe can be washed while running the dust collecting water during the operation of the dust collector. It is not necessary to interrupt the operation of the dust collector to clean the pipe as in the above, and the converter can be operated continuously, and even if the pipe is not full, as long as the collected water flows, The pipes can be cleaned automatically, and the pipes can be cleaned automatically without manual operation.
The maintenance of the piping can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a wet dust collector and its piping of a converter exhaust gas treatment facility.

FIG. 2 is a diagram illustrating a pipe cleaning system provided in the pipe of FIG. 1;
FIG.

FIG. 3 shows the operation mode of the converter, where a is the amount of converter exhaust gas generated, b is the amount of dust in the dust collection water, and c is the cleaning time.

FIG. 4 is a view showing another one of the pipe cleaning systems provided in the pipe of FIG. 1;

FIGS. 5A to 5E are diagrams showing a situation in which dust adheres and accumulates on the inner surface of the pipe over time and grows.

[Description of Signs] 1 Piping 2 Dust collection water 3 Dust 5 Dust collector 6 Piping cleaning device 7 Compressed gas ejection tank 9 Compressed gas ejection tube 10 Automatic valve 11 Compressed gas supply tube 12 Electromagnetic flow meter 13 Cleaning control device

Claims (2)

(57) [Claims] An instantaneous injection of compressed gas into a long pipe through which dust collected in exhaust gas flows through a wet dust collector of a converter exhaust gas treatment facility to rapidly accelerate the flow of water. A pipe cleaning device that forms a very turbulent and intense flow by forming air-water mixture and causes hammering in the pipe to impact the entire pipe and peel off dust attached to the pipe due to the impact. A large number of converters are installed at a certain pitch, and these pipe cleaning devices are automatically operated in order from the downstream side of the pipes in accordance with the operation pattern of the wet dust collector to clean the inside of the pipes. Wet dust collector piping cleaning system. 2. A compressed gas is spouted instantaneously into a long pipe through which dust collected in the exhaust gas flows through a wet dust collector of a converter exhaust gas treatment facility to rapidly accelerate the flow of water. A pipe cleaning device that forms a very turbulent and intense flow by forming air-water mixture and causes hammering in the pipe to impact the entire pipe and peel off dust attached to the pipe due to the impact. A large number is installed at a certain pitch, an electromagnetic current meter is provided downstream near each pipe cleaning device, and each electromagnetic current meter is connected to the cleaning control device, and the amount of dust adhering to the pipe is detected by a flow velocity measurement, and a predetermined value is determined. Calculates the cleaning time or the interval between the pipe cleaning devices by reaching the amount of dust adhered to the converter, and automatically operates the required pipe cleaning devices sequentially from the downstream side of the pipes to clean the inside of the converter. Equipment wetness Pipe cleaning system for dust collectors.