JPS6223207B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a dust accumulation prevention device, and is particularly suitable for preventing dust accumulation in the idle side flue during single-lung operation of an electrostatic precipitator. This invention relates to a dust accumulation prevention device.

[Background of the invention]

In thermal power plants, an electric precipitator (hereinafter referred to as EP) is generally installed in the middle of the flue to prevent dust from scattering, and it processes more than 90% of the dust emitted from the boiler. ing.

FIG. 1 is a configuration diagram showing an example of a thermal power plant. Two flues 2a and 2b are connected to the boiler 1, and EPs 3a and 3b each having a 50% capacity are connected to each flue. Furthermore EP3
Flues 4a and 4b are connected to each of a and 3b, and the exit sides of these are connected to a flue 5 and are unified. A chimney 6 is connected to the end of the flue 5.

In the above configuration, the exhaust gas containing a large amount of soot and dust discharged from the boiler 1 is discharged from the flues 2a and 2b.
It is sent to EP3a, 3b via. EP3a,3
In b, about 90% of the dust in the exhaust gas is removed by electrostatic precipitation, and the purified gas is sent to the chimney 6 through the flues 4a, 4b and 5.

By the way, in the configuration shown in FIG. 1, the two flues 4a and 4b meet at the connection point with the flue 5, but when the plant load fluctuates or when the EP is switched to single-lung operation, Dust that has adhered or accumulated in the flue after the EP is re-dispersed and may exceed the regulated concentration of dust at the chimney outlet.

For example, FIG. 2 shows the flow of exhaust gas and the state of dust accumulation during single-lung operation when the flue 4b is stopped. A partition plate 7 is provided parallel to the flue 5 at the confluence of the flues 4a and 4b, and a partition plate 8 is provided parallel to this partition plate 7 for rectifying the exhaust gas from the flues 5a and 4b. It is being As shown by the arrow in the figure, the gas flow wraps around behind the partition plate 7 into the flue 4b on the idle side, and as the gas flow stagnates at this wraparound part, the dust in the gas settles on the exit side of the flue 4b. and deposit.

When the idle EP resumes operation with dust accumulated in the flue, the accumulated dust is scattered because exhaust gas flows into the flue 4b, and all of it is discharged from the flue 6 at once. be done. As a result, the dust concentration may exceed the regulation value, which poses a pollution problem.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide a dust accumulation prevention device that can prevent dust from accumulating in the flue during single-lung operation.

[Structure of the invention]

In short, the present invention installs an exhaust gas guide pipe that guides a part of the exhaust gas flowing through the operating side flue to the idle side flue, and directs the exhaust gas to the idle side flue through a gas blowing hole provided in the idle side flue of the exhaust gas guide pipe. The exhaust gas is emitted in the direction of movement of the side flue to generate a gas flow.

[Embodiments of the invention]

Figures 3 and 4 show one embodiment of the present invention, and the same reference numerals are used for the same parts as shown in Figure 2, so redundant explanation will be omitted. It has a gas intake port 9 that introduces a part of the exhaust gas from one side of the flue 4 through the flue 4, and has a gas outlet hole 10 whose end is fixed to the other side of the flue 4 and discharges the exhaust gas introduced downstream. The structure differs from FIG. 2 in that at least one pair of a plurality of exhaust gas guide pipes 11 is provided in the flue 5. As shown in FIG. 5, a plurality of exhaust gas guide pipes 11 are vertically arranged at predetermined intervals to form a uniform gas flow in the flue in the exhaust gas traveling direction.

In the above configuration, for example, when the EP 3b is stopped, a part of the exhaust gas in the flue 4a is taken in from the gas intake port 9 of the exhaust gas guide pipe 11 protruding toward the flue side, and passes through the partition plate 7 to the flue 4b. The exhaust gas taken into the side flue 5 through the gas blowing hole 10 is discharged in the exhaust gas traveling direction of the flue 4b. This released gas prevents the generation of vortices in the flue on the idle side, thereby eliminating the accumulation of soot and dust in the flue. Even when the EP 3a is stopped, the same phenomenon as described above occurs, and the accumulation of soot and dust in the flue is prevented.

Note that even under normal conditions when both EPs 3a and 3b are in operation, exhaust gas on the opposite side of the partition plate 7 is released, but some of the exhaust gases simply bypass each other, and the function of the flue 5 is affected. It will not have any impact. In addition, since one end of the exhaust gas guide pipe 11 is structurally fixed to the flue wall and the other end is fixed to the partition plate 7, the exhaust gas guide pipe 11 is a reinforcing material or a fixing material for the flue 5 and the partition plate 7. It can function as

Furthermore, in the description of the above embodiments, the exhaust gas guide pipes are installed so that the blow-off holes are arranged horizontally, but the exhaust gas guide pipes can also be installed so that they are arranged vertically.
Furthermore, exhaust gas guide pipes may be installed both horizontally and vertically.

〔Effect of the invention〕

As is clear from the above, according to the present invention, EP
It is possible to prevent dust from accumulating in the flue merging part during single-lung operation, and to prevent an increase in dust concentration due to re-dispersion, thereby preventing pollution.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an example of a thermal power plant, Fig. 2 is an explanatory diagram showing the dust accumulation state during single-lung operation of the system of Fig. 1, and Fig. 3 is a plan view showing an embodiment of the present invention. 4 is a plan view showing the detailed configuration of the embodiment shown in FIG. 3, and FIG. 5 is a cross-sectional view taken along the plane shown in FIG. 3. 1...Boiler, 2a, 2b, 4a, 4b, 5...
...Flue, 3a, 3b...Electric dust collector, 6...
Chimney, 7, 8... Partition plate, 9... Gas intake port, 1
0...Gas blow-off hole, 11...Exhaust gas guide pipe.

Claims (1)

[Claims] 1 The flue gases connected to each of the plurality of electric precipitators that may be operated separately are merged into the flue leading to the chimney, and the exhaust gas from the non-inactive side flue is discharged into the inactive side flue. A dust accumulation prevention device comprising an exhaust gas guide pipe whose discharge direction is the exhaust gas traveling direction of the inactive flue.