CS235881B1 - Filter station - Google Patents

Abstract

A filtration station for capturing dust drifts containing a filter with a bypass according to the invention is used primarily in operations of bituminous mixture packaging plants. The bypass is formed by a connecting part connected on one side to the inlet pipe of the filtration station and on the other side to the outlet part of the filter. This significantly shortens the total length of the bypass pipe. Conducting hot air during the start-up of the packaging plant through the outlet part of the filter connected by the connecting part to the inlet pipe ensures preheating of the upper part of the filter, which after the start-up of operation reduces the negative effects of chemical corrosion on the metal parts of the filter and the outlet pipe.

Description

(54)

Filtration stations

The particulate filter station comprising a bypass filter according to the invention is mainly used in bituminous mixing plants. The bypass consists of a connecting piece connected one side to the inlet duct of the filter station and the other side to the outlet part of the filter. This significantly reduces the total length of the bypass pipe. Conduction of hot air during the approach of the mixing plant through the filter outlet part connected to the inlet duct by the connecting piece ensures preheating of the upper part of the filter, which reduces the negative effect of chemical corrosion on the metal parts of the filter and the outlet duct.

235 861

235 881

BACKGROUND OF THE INVENTION The present invention relates to a filtration station comprising a bypass filter used primarily for the collection of dusty debris from bituminous mixing plants. ·

When using industrial filters to capture dusty debris from bituminous mixing plants, the filtration station is equipped with a bypass through which the air is guided outside the filter during the start-up of the operation. After heating the rotary drier of the mixing plant and introducing the dried mixture into the drier, when the temperature of the air mass drops below the set value, the bypass pipe is closed and the inlet to the filter is opened. The dust separates in the filter and the cleaned air is led to the fan and from there to the chimney. Filtration stations at the mixing plants are most often equipped with pocket industrial filters, in which the bypass line is routed along the filters to their outlet side, where it is connected to the outlet line in front of the suction opening of the fan. There are problems with the location of the bypass pipe, as there is usually a lack of free space in the operations. The length of the bypass line is considerable and, in addition, the bypass line increases the built-up floor area required for the construction of the filtration station.

These disadvantages are overcome by a dust collecting filter station comprising a bypass filter, the outlet portion of which is connected to the outlet pipe of the filter station with one side. The main object of the invention is that the bypass is formed by a connecting piece connected one side to the inlet duct of the filter station and the other side to the outlet part of the filter.

- 2.235 881

The advantage of this arrangement is the shortening of the total length of the bypass, which leads to saving of labor, material and built-up space. In addition, the hot upper part of the filter heats up when the hot air passing through the filter outlet is bypassed. When closing the bypass and introducing the polluted air into the filter, condensation is not common in the outlet part of the filter or in the outlet part, including the outlet duct, when the bypass is arranged along the line next to the filter. While the existing equipment is subjected to intensive chemical corrosion of the metal parts due to the condensation, since the filtered air contains sulfur dioxide, a substantially longer service life of the filter station is achieved in the embodiment of the invention.

Referring to the two attached figures, a filter station comprising a bypass filter is shown, wherein FIG. 1 shows the bypass arrangement used in prior art filter stations and FIG. 2 shows the bypass arrangement according to the invention.

Dusty air emerges from the rotary dryer and is guided through inlet pipe 2, filter station to filter On start-up of the existing configuration, the inlet flap 10 is closed in front of filter J and hot air is passed through bypass pipe 8 through open flap 9 into the suction of the fan 6 and into the chimney J. In the embodiment according to the invention / FIG. 2 / the outlet part 6 of the filter 2 is used to provide a bypass. · Hot air during the start-up of the mixing plant flows from the dryer through the inlet pipe 2 to the filter at the inlet of which the flap 10 is closed.

A connecting piece 11 is connected from the inlet pipe 2, which is connected to the outlet part 4 of the filter. The hot air passes through the open flap 8 and the outlet 4/14 of the filter J into the outlet pipe 6 and from there through the fan 6 into the chimney.

The filter station containing the bypass filter according to the invention has application in all plants where it is necessary to use the bypass _{from the} start-up of the operation or when the set maximum limit is exceeded.

235 881 operating air temperature of the filtered air, for example in various types of drying kilns and manufacturing and technological processes, which can cause condensation during start-up or the temperature of the filtered air can rise above the filter's thermal resistance.

Claims (1)

SUBJECT OF THE INVENTION 235 881 A dust collecting filter station comprising a bypass filter, the outlet of which is connected to one side of the outlet of the filtering station, characterized in that the by-pass is formed by a connecting piece (11) connected one side to the inlet of the filtering station. aside the output part / 4 / filter / 3 / ·