JPS6212417Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a dry electrostatic precipitator using a damper method.

Conventional technology In the conventional dry electrostatic precipitator, the duct adhering to the dust collecting electrode is dropped and deposited on the hopper by hammering, but during the hammering, some of the dust is re-dispersed into the gas flow. It tends to be discharged outside the electrostatic precipitator, and this is one of the factors that reduces the performance of dry electrostatic precipitators.

As shown in Fig. 1, the dust collector 1 is divided into a plurality of sections 3 by partition walls 2, and dampers 4 and 5 are installed at the entrance and exit of each section 3 as a device to prevent re-scattering due to hammering. suggested something.

Problems that the invention aims to solve: However, with this device, the gas inside the hammering section leaks a little through the gap between the exit damper 5 and the partition wall 2, and the floating dust contained in this leaked gas is discharged to the outside. This has been a problem especially in plants where high cleanliness is required.

As an improvement to this, dampers 4 and 5 are provided at the inlet and outlet of each section 3 as shown in FIG. 2 to prevent dust leaks, and are placed between each section 3 and the upstream side of the dust collector 1. The proposed method includes a bleed duct 6 and a bleed means for bleeding the gas in each section through the duct, and bleeds the section during hammering using the bleed means.

The present invention is a further improvement on such a device, which prevents dust leakage from inside the hammering section and removes smoke from the outlet by extracting leaked gas between double dampers provided at the outlet of the dust collector. It is equipped with a gas bleed system that can completely prevent dust from leaking into the road.

Means for Solving the Problem The present invention is an electrostatic precipitator in which a damper is installed at the entrance and exit of the dust collector to prevent dust from being re-scattering during hammering. They are arranged in double rows with a desired gap like a side damper, and a bleed duct is provided between the inside of both dampers and the upstream side of the dust collector, and the gas in both dampers is used as bleed air and is returned to the upstream side of the dust collector. It is something that I am forced to send.

Effect: According to the present invention, dust leakage from the hammering section can be completely prevented, and a product with high cleanliness can be obtained.

Example An example of the present invention will be explained in detail with reference to the drawings.

As shown in FIG. 3, the dust collector 1 is divided into a plurality of sections 3 by a partition plate 2, and a damper 4 is installed at the inlet of each section 3, and a damper 11 is installed at the outlet of each section, and an upstream damper 10 and a downstream damper 11 are installed in desired gaps. 12
and install them in parallel.

Although it is desirable that the partition plate 2 has a structure with good sealing properties, the intended purpose can be achieved by completely sealing only the non-charged portion downstream of the charging chamber of the dust collector 1 with the seal wall 13. I can do it.

Air bleed ducts 6 are arranged between the dust collector outlet dampers 10, 11 and the upstream side of the dust collector 1, and each bleed duct 6 is equipped with a section switching damper 7. Further, this air bleed duct 6 is combined into one in the middle, and a gas bleed fan 8 is attached thereto.
By operating this section switching damper 7, the number of fans 8 installed can be reduced.

In this dust collection device, the inlet damper 4b and outlet dampers 10b and 11b of the hammering section 3 are opened during dust collection, and the section switching damper 7b is closed. On the other hand, during hammering, the inlet damper 4a and outlet dampers 10a and 11a are closed, and the section switching damper 7a is opened. In this state, the gas leaking from the outlet damper 10a, that is, the seal air q ₁ of the discharge electrode support insulator (not shown) and the precipitator inlet pressure
The leak gas generated due to the difference between p ₁ and the dust collector outlet pressure p ₂ is kept in the gap 12a and guided to the bleed duct 6a and section switching damper 7a by the bleed fan 8.
The dust is sucked in and returned to the flue 14 at the entrance of the dust collector.

Even if gas leaks from the upstream damper 10a of the outlet damper, the downstream damper 11
By a, leakage of this gas to the outlet flue 15 can be completely blocked. Therefore, since the leak gas remains in the gap 12a between the upstream damper 10a and the downstream damper 11a, it is sufficient to bleed the gas from there.

After hammering is completed, the outlet upstream side 10a is left half open, and after absorbing and ventilating the gas in the outlet throttle duct, all dampers 4a, 10a, and 11a are opened.

Also, the section switching damper 7 and the bleed fan 8 are linked with the hammering sequence.

Effects of the Invention As detailed above, the present invention has remarkable effects such as being able to completely prevent dust leakage from the hammering section and obtaining a product with high cleanliness.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional damper type electrostatic precipitator, Fig. 2 is an explanatory diagram of a damper type electrostatic precipitator as a comparative example, and Fig. 3 is an explanatory diagram of an electrostatic precipitator showing one embodiment of the present invention. FIG. 1... Dust collector, 2... Partition wall, 3... Section, 4... Inlet damper, 5... Outlet damper, 6
...Bleed air duct, 7...Section switching damper,
8... Gas bleed fan, 10... Damper on the upstream side of the outlet, 11... Damper on the downstream side of the outlet, 12... Gap, 13... Sealing wall, 14... Flue inlet, 15...
...flue exit.

Claims (1)

[Scope of utility model registration request] In an electrostatic precipitator equipped with a damper at the entrance and exit of the dust collector to prevent dust from being re-scattering during hammering,
The dampers provided at the outlet of the dust collector are arranged in two layers, such as an upstream damper and a downstream damper, with a desired gap, and an air bleed duct is provided between the dampers and the upstream side of the dust collector. An electrostatic precipitator, characterized in that the gas in both dampers is extracted and returned to the upstream side of the precipitator.