JPS60114320A - Dust collector in asphalt plant or the like - Google Patents

Abstract

PURPOSE:To obtain the titled collector with high dust collection efficiency, a simple structure, and a small loss of heat energy which is easy to manufacture by uniting the first and the second dust collector to a body, allowing a duct to pass through the second dust collector and to communicate with the first dust collector. CONSTITUTION:The waste gas discharged from an aggregate dryer 11 is introduced into a duct 17 in a dust collector 10 from a waste gas inlet 17a through a connecting duct, passed through the duct 17, and sent into the first dust collector 14. The waste gas is spiraled along the outer circumference of an inner cylinder 20, and sent into a filtration chamber X of the second dust collector 15 through the inside of the inner cylinder 20. The fine particle components of the dust contained in the waste gas are collected by a filter cloth 16, and the waste gas is purified. Then the purified gas is sent into a gas purifying chamber Y through a venturi sheet 21. The waste gas is discharged to the outside from a stack 13 through a purified gas outlet 22 by an exhaust fan 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust collector that separates and collects dust in exhaust gas mainly generated from an asphalt plant.

Conventionally, in a device for treating exhaust gas generated from an aggregate drying furnace of an asphalt plant, an aggregate drying furnace A and a cyclone C are connected via a duct B, and a cyclone C and a The bag filter E is connected to the bag filter E through a duct D, and the bag filter E is connected to an exhaust fan F and a chimney G. Guided within;
Coarse particle components in the exhaust gas are collected in cyclone C,
The exhaust gas that is collected from the lower part of the cyclone C and passed through the cyclone C is sent to the bag filter E through the duct D, where the particulate components in the exhaust gas are collected and the exhaust gas is collected by the bag filter E. The exhaust gas collected via the screw conveyor 1 and rotary valve 2 provided at the bottom and purified in the bag filter E is discharged from the chimney G via the exhaust fan F.◎ However, the above In a device configured as shown in the figure, the duct B between the aggregate drying oven A and the cyclone C and the duct D between the cyclone C and the bag filter E are exposed to the outside. The radiated heat escaping from B and D to the outside is approximately 10X in one plant, for example.
10' 1cal/h, and there is a problem that the energy loss is extremely large, and the thermal energy retained in the exhaust gas is not recovered at all and is wasted, and if the exhaust gas is not cooled too much by the ducts B and n. There is a possibility that the water vapor contained in the exhaust gas condenses in the bag filter E, clogging the filter cloth 3 in the bag filter E, and reducing the dust collection efficiency of the bag filter E. It's a trench, cyclone C and bag filter E and duct) B, D
The joint between the flange part 4 of the duct B and the cyclone C
The flange part 5 at the gas inlet of the cyclone C, the 7-rank part 6 at the exhaust gas outlet of the cyclone C, the flange part 7 at one end of the duct D, and the 7-rank part 8 at the other end of the duct D and the bag filter E. Since the flange portions 9 of the gas inlet portions of the gas inlet portion are connected to each other by bolts or the like, there is a problem in that processing and assembling each portion takes time and effort, and equipment costs increase.

The present invention provides a first dust collector for collecting coarse particles in the exhaust gas and a second dust collector for collecting fine particles in the exhaust gas, and a duct from the exhaust gas generation source is connected to the inside of the second dust collector. By penetrating the dust collector and connecting it to the first dust collector, the above conventional problems are solved.The structure is simple and easy to manufacture, and there is less loss of heat energy held by the exhaust gas, making it easier to collect. The purpose of this invention is to provide a dust collector for asphalt plants etc. that has extremely high dust efficiency.

Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIGS. 4 to 7 show an embodiment of the present invention,
Reference numeral 1 in the figure (1: indicates a dust collector according to the present invention, and this dust collector 10 collects dust from exhaust gas in an aggregate drying furnace 11 of an asphalt plant, and purifies the exhaust gas. is configured to be discharged to the outside from a chimney 13 via an exhaust fan 12.

The dust collection bag ft1o has a first dust collector 14 that collects coarse particles in exhaust gas using centrifugal force or inertial force, and a second dust collector 15 that collects fine particles in exhaust gas by filtering them. The first dust collector 14 is integrally connected to the dust collector main body B, and the first dust collector 14 is connected to the plurality of filter cloths 1 of the second dust collector 15.
6 is arranged, from the upper part of one side of the filtration chamber X (upper right side in Figure 5) to the lower part of the other side of the filtration chamber It is configured to be connected to a duct 17 provided. The first dust collector 14 also includes an outer cylinder 19 fixed to the lower surface of the partition wall 18 that partitions the filtration chamber X of the second dust collector 15 and the first dust collector 14, and an outer cylinder 19 that is bored in the center of the partition wall 18. and an inner cylinder 20 whose upper end is fitted into a hole, and a pair of dust collection parts 14bu at the lower part of the first dust collector 14.
Its upper end is flanged to the lower part of one side of the dust collector main body B, and its lower end is provided with a collection port 14a for collecting the collected dust. Furthermore, the second dust collector 1
A purified gas chamber Y is provided above the filtration chamber There is.

The upper end of the lower dust collecting section 15a of the second dust collector 15 is flange-bonded to the lower end of the dust collector main body B, and the lower end includes a screw conveyor 23 for transferring the collected dust, and a screw conveyor 23 for transferring the collected dust. A rotary valve 24 connected to the screw conveyor 23 is provided.

The exhaust gas population 17a side of the duct 17 is connected to the aggregate drying furnace 11 of the asphalt plant, which is the source of exhaust gas, through a connecting duct (not shown), and the exhaust gas population 17a side is A bypass duct 25 branches off from the duct 17 and communicates with the purification gas chamber Y, and a gas outlet 25& of the bypass duct 25 that opens toward the purification gas chamber Y side is provided with an opening/closing lid 26. This opening/closing lid 26 has a handle 26a attached to the tip of a rod 27a, and a cylinder body 27b attached to the upper surface of the second dust collector 15 via a mounting member 28.
7, it is moved up and down to open and close the gas outlet 25a.

Next, the operation of the dust collector configured as described above will be explained.

First, when the aggregate drying furnace 11 of the asphalt plant is in normal operation, the opening/closing lid 26 is closed by the cylinder device 27, and the exhaust gas discharged from the aggregate drying furnace 11 is passed through the connecting duct. (not shown), is introduced from the exhaust gas inlet 17a of the duct 17 of the dust collector 10, passes through the inside of the duct 17, and is sent to the first dust collector 14.

When the exhaust gas passes through the duct 17, the heat held by the exhaust gas is transmitted to the filtration chamber X of the second dust collector 15 through the duct 17, thereby warming the inside of the filtration chamber X.

Then, the exhaust gas sent into the first dust collector 14 through the inside of the duct 17 turns around along the outer periphery of the inner cylinder 20 and is then sent to the filtration chamber X of the second dust collector 15 through the inside of the inner cylinder 20. It will be done. At this time, coarse particle components of the dust contained in the exhaust gas are collected from the collection port 14a at the bottom of the first dust collector 14 and reused as part of the aggregate. Furthermore, the second
The exhaust gas sent into the filtration chamber X of the dust collector 15 is filtered through the filter cloth 1
6, particulate components of the dust contained in the exhaust gas are collected and purified, and sent to the purified gas chamber Y through the venturi sheet 21. At this time, the collected particulate components accumulate at the bottom of the second dust collector 15, are transferred to one end by the screw conveyor 23, and are transferred to the rotary valve 2.
4 and reused as part of stone powder. The exhaust gas sent to the purified gas chamber Y passes through the purified gas outlet 22 and is discharged to the outside from the chimney 13 by the exhaust fan 12.

In addition, unburned mist (liquid component) generated when adjusting or malfunctioning the burner device that heats the inside of the aggregate drying furnace 11 of an asphalt plant is rarely collected by pre-dusters such as conventional knockout boxes. 9. The filter cloth of the bag filter placed after the pre-duster was damaged and the dust collection efficiency was reduced, but in the dust collector according to the present invention, the first dust collector using the duct 17 or centrifugal force or inertial force Since unburned mist is adsorbed by the second
Unburnt mist will not be adsorbed to the filter cloth 16 of the dust collector 15, and the dust collection efficiency will not be reduced.

Furthermore, when adjusting the burner, if there is a risk that the filter cloth 16 of the second dust collector 15 may be burnt due to unburned mist, the cylinder device 27 is temporarily activated, the opening/closing lid 26 is opened, and the duct 17 is opened. and the purified gas chamber Y, so that the exhaust gas is directly discharged from the purified gas outlet 22.

Incidentally, the dust collector 10 according to the present invention is not only used for purifying exhaust gas generated from the aggregate drying furnace 11 of an asphalt plant, but also can be used for a drum mixer, an asphalt regeneration plant, etc. It can be used when it is necessary to collect dust from exhaust gas.

As explained above, the present invention provides a first dust collector that collects coarse particles contained in exhaust gas, and a second dust collector that collects fine particles contained in the exhaust gas, and a duct that Since it penetrates through the second dust collector and is connected to the first dust collector, it is possible to reduce the number of ducts to be installed compared to conventional equipment, reduce the number of parts, and have a simple structure and easy manufacturing. One of the advantages is that less heat is dissipated to the outside, and the thermal energy of the gas is less likely to be lost. Furthermore, since the duct passes through the second dust collector, the second dust collector is warmed, and water vapor does not condense within the dust collector due to a drop in temperature, so that the dust collector does not become clogged. Therefore, it has excellent effects such as being able to maintain high dust collection efficiency.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional dust collectors. Figure 1 is a system diagram for exhaust gas treatment, Figure 2 is a front view, Figure 3 is a side view, and Figures 4 to 7 are Fig. 4 is a system diagram, Fig. 5 is a front view, Fig. 6 is a side view, and Fig. 7 is a sectional view taken along the line ■-■ in Fig. 5, showing one embodiment of the present invention. . 14...First dust collector, 15...Second dust collector, 17...Duct. Applicant: Niigata Iron Works Co., Ltd. Representative: Patent Attorney: Tadashi Shi Xi, J”'@.

Claims (1)

[Claims] A dust collector is integrally provided with the exhaust gas outlet of the first dust collector directly connected to the exhaust gas inlet of the second dust collector, and a duct for guiding the exhaust gas into the first dust collector passes through the inside of the second dust collector. A dust collector in an asphalt plant, etc., characterized in that it is connected to the first dust collector.