JPH01262916A - Dust collecting apparatus - Google Patents

Abstract

PURPOSE:To prevent the adhering of dusts to filter cloth due to their moisture absorption and deliquescence, by supplying hot air from a superheated air supply mechanism to a filter chamber of a dust collecting body together with a dust- containing air to increase the internal temperature of the filter chamber so as to maintain the humidity therein at a value not exceeding a predetermined humidity. CONSTITUTION:There are provided a dust collecting body 2 and a superheated air supply mechanism 3 for supplying hot air to said dust collecting body 2. The hot air is supplied from the superheated air supply mechanism 3 to a filter chamber 6 of the dust collecting body 2 together with a dust-containing air to increase the internal temperature of the filter chamber 6 so as to maintain the humidity therein at a value not exceeding a predetermined humidity, thereby eliminating the possibility of the dusts being coagulated by the moisture absorption and preventing the plugging of filter cloth resulting from the coagulation, leading to an easy separation of the dusts from the filter cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a dust collector for filtering air containing dust, particularly dust having hygroscopic and deliquescent properties.

[Conventional technology]

In general, when transporting or combing hygroscopic powders such as chemical fertilizers and cement, or chemicals that absorb moisture and have deliquescent properties such as salts, the dust generated during work may contaminate the environment. Therefore, a method is adopted to filter the dust-containing air using a dust collector.

[rR problem that the invention attempts to solve]

However, these dust particles absorb moisture and stick to the filter surface, causing clogging, and even when removed by normal photographing or back jetting of pressurized air, they may stick and become difficult to remove. For this reason, a dust collector with large mesh size is used to account for the reduction in filtration area due to clogging, but this increases equipment costs and also has problems such as the filter cloth having a short life and requiring a lot of effort to replace.

In view of this, the present invention aims to increase the temperature in the filtration chamber into which dust-containing air is introduced into the dust collector, reduce the relative humidity, and prevent the dust from adhering to the filter cloth due to moisture absorption and deliquescence. With the goal.

[Means to solve the problem]

In order to achieve the above object, the dust collector of the present invention includes a dust collector main body and a superheated air supply mechanism that supplies heated air to the dust collector main body, and the heated air from the superheated air supply mechanism is supplied to the dust collector main body together with dust-containing air. The purpose is to supply it to the filtration chamber, raise the temperature in the filtration chamber, and maintain it below a predetermined humidity level.

Further, it is preferable that the superheated air supply mechanism heats a part of the purified air discharged from the dust collector main body and circulates it into the dust collector main body filtration chamber.

Furthermore, the air supply pipe for the superheated air supply mechanism is connected to the discharge side of the purified air suction blower connected to the dust collector main body,
Preferably, heated air is circulated and supplied to the filtration chamber by operating the blower.

[For production]

By supplying heated air to the filtration chamber together with the processing air, the temperature inside the filtration chamber increases and the relative humidity decreases, and the dust is maintained in the powder M state without absorbing moisture.

In addition, the exhaust gas from the main body of the W machine has a higher temperature than the outside air temperature, and when this is recycled, heating energy can be reduced.

Furthermore, by connecting the exhaust side of the intake blower connected to the dust collector main body with the superheated air supply mechanism, heated air is supplied to the filtration chamber by the suction pressure of the blower.

【Example〕

The figure shows an embodiment of the invention. The dust collector l is the dust collector body 2
and a superheated air supply mechanism 3.

The S dust machine main body 2 has an inner chamber divided by a vertical partition wall 4, with one side serving as a filtration chamber 6 connected to a dust-containing air introduction duct 5, and the other side serving as a purified air chamber 7.

The duct 5 has an opening above the filtration chamber 6, and is of a so-called top inlet type, and the lower chamber of the 111-channel chamber forms a hopper 8 that is shaped sequentially as it goes downwards, and a rotary valve 9 is attached to the lower part of the hopper. The dust accumulated in the hopper is discharged while maintaining airtightness. 5a in Figure 0
is the opening of the introduction duct 50.

In the filtration chamber 6, a large number of bag filters 1O are arranged in parallel at predetermined intervals, and the frontage portion is attached to the partition wall 4, and in the purified air chamber 7, a funnel-shaped venturi 11 connected to the opening of the bag filter 100 is attached. , and venturi 1
An injection pipe 12 that injects high-pressure air is installed opposite to 1,
When dust adheres to the bag filter 10 and reaches a predetermined filtration resistance, high-pressure air is pumped through the injection pipe 12 to the bag filter l.
Blow into O in a pulsed manner to peel off attached dust by expansion/contraction and ventilation flow.

13 is an intake blower, and the purified air chamber 7 is an exhaust pipe 14.
connected via. 15 is an on-off valve attached to the exhaust pipe 14, and 16 is a silencer.

The superheated air supply mechanism 3 includes an air heating chamber 20 and heaters 21 and 22 housed within the air heating chamber. However, the heater 21 is a large-capacity heater, and the heater 22 is a small-capacity heater, and the heating chamber discharge side is connected to the introduction duct 5 via a delivery pipe 23.

The air receiving side of the heating chamber 20 is divided into two parts, and one side has an on-off valve 24.
And the above-mentioned suction blower by the air supply pipe 26 via the filter 25! Connected to the discharge side of 3. The other end is connected to the exhaust pipe 14 by an auxiliary air supply pipe 30 via an on-off valve 27, a suction blower 28, and a filter 29.

In the figure, 40.41 is a temperature measuring device installed in the filtration chamber 6 and the introduction duct 5, 42 is a control mechanism, and 50.5
1 has a hood for the powder processing machine 52, 53, the powder processing machine 52 is, for example, a conveyor conveyance machine, and 53 is a Sakaki mechanism.

In the above configuration, the dust generated from each powder processing machine 52, 53 is removed from the introduction duct 5 by the suction action of the intake blower 13.
is sucked into the filtration chamber 6 through the filtration chamber 6. At the same time, the suction action of the suction blower 13 is also exerted on the heating chamber 20 side, and a part of the exhaust air from the suction blower 13 is passed through the air supply pipe 26 to the heating chamber 20 side.
The heated hot air flow is drawn into the delivery pipe 23.
and is introduced into the filtration chamber 6 via the introduction duct 5, raising the room temperature.

Although it depends on the nature of the dust, hygroscopic powder generally has a humidity of 50~
If it exceeds 60%, it may absorb moisture and solidify. Therefore, when heating air is mixed with dust-containing air sucked at room temperature (20℃) to raise the temperature to 40℃ or higher, the humidity at the time of suction is 60℃.
~70%, the relative humidity can be 50% or less. Therefore, the dust adhering to the bag filter 10 does not solidify and can be easily peeled off by back injection of pressurized air.

The temperature of the filtration chamber 6 and the introduction duct 5 is applied to the control mechanism 42, and the control mechanism 42 selectively operates the large-capacity heater 21 and the small-capacity heater 22 based on this to lower the filtration chamber temperature to a predetermined temperature, that is, the set humidity. 1＾Hold.

Note that the intake blower also stops when the powder processing machine stops, such as at night, but be careful! ! Dust remains inside the machine body 2, and if left as is, there is a risk that the temperature will drop and the humidity will rise, leading to moisture absorption and solidification.

In this case, close the exhaust pipe 14, the inlet duct 5, and the on-off valves 15, 17, and 24 of the air supply pipe 26, open the switch 27 of the auxiliary air supply pipe 30, and operate the suction blower 28 to circulate hot air. The inside of the dust collector body 2 is maintained at a predetermined temperature. In this case, a small amount of circulating air is sufficient, and the suction blower 28 can be made small.

The above embodiment shows an example in which a part of the exhaust gas from the dust collector main body 2 is taken in, heated and supplied into the filtration chamber 6, but when using this method, the exhaust temperature is higher than the outside air temperature, and the heating chamber 2 is heated. It is possible to save heating power.

Depending on the humidity of the outside air or the type of dust,
The heated air supplied from the heating chamber 20 may be kept at a relatively low temperature. In this case, outside air may be taken in without using exhaust air, by opening the on-off valve 61 of the outside air intake pipe 6o shown by the chain line, and connecting the intake pipe 60 of the air supply pipe 26 and the intake blower 13 outlet. Close the on-off valve 62 provided between the sides. Even in this case, the air heated in the heating chamber 20 can be sucked in by the suction force of the intake blower 13 and supplied into the filtration chamber 6 .

Similarly, an outside air intake pipe 63 is provided in the auxiliary air supply pipe 30,
The on-off valve 64 provided on the intake pipe may be opened, the on-off valve 65 provided on the auxiliary static electricity intake pipe 30 may be closed, and the suction blower 28 may suck in outside air.

〔Effect of the invention〕

The present invention has the following effects.

Since heated air is supplied into the filtration chamber along with dust-containing air to raise the filtration chamber temperature, the relative humidity decreases, there is no risk of the powder coagulating due to moisture absorption, and filter cloth clogging due to coagulation is prevented. This makes it easy to remove powder adhering to the filter cloth.

Furthermore, when the heated air supplied to the filter chamber is the high-temperature air discharged from the dust collector body, it is possible to save heating power.

Furthermore, when air is taken in from the discharge side of an intake blower connected to the dust collector body, heated, and supplied to the filtration chamber, the intake blower can also be used to circulate the superheated air while saving heating power by using high-temperature exhaust air. The structure is simple and power costs can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. FIG. 1 is a schematic explanatory view of the entire structure, and FIG. 2 is a sectional view taken along line I-1 in FIG. 1. 1 is a dust collector, 2 is a dust collector main body, 3 is a superheated air supply mechanism, 6 is a filtration chamber, and 13 is a suction blower.

Claims (3)

[Claims] (1) Equipped with a dust collector body and a superheated air supply mechanism that supplies heated air to the dust collector body, and supplies the heated air from the superheated air supply mechanism together with dust-containing air to the filtration chamber of the dust collector body to increase the temperature in the filtration chamber. A dust collector characterized in that the humidity is maintained at a predetermined humidity or lower. (2) The dust collector according to claim 1, wherein the superheated air supply mechanism heats a part of the purified air discharged from the dust collector main body and circulates and supplies the purified air into the dust collector main body filtration chamber. (3) The air supply pipe for the superheated air supply mechanism is connected to the discharge side of a purified air suction blower connected to the dust collector main body, and the heated air is circulated and supplied to the filtration chamber by the operation of the blower. dust collector.