JPH09101088A - Recovery apparatus for evaporated component exhausted from vacuum heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To substantially completely recover evaporated components discharged from a vacuum heating furnace by scratching off condensates of the evaporated components fixed to an internal wall surface of a condenser with a movable member provided on the condenser, and recovering the scratched condensates with a filter and backwashing means of the filter. SOLUTION: Vapor components discharged from a vacuum heating furnace are condensed with a water cooling condenser 11. Many of the condensates are fixedly deposited on an internal wall surface of the condenser 11, so that they are scratched off by lowering a cylinder driven disk (movable member) 13 and are dropped onto an opening/closing door 12 that is closed. Parts of the condensates are dropped with an air stream. These are captured with a wire gauze (filter) 52 stretching in a filter 51 disposed on the downstream side. The condensates captured by the metal gauze 52 are blown down from a header 53 as the backwashing means and a nozzle onto the back surface of the metal gauze 52 by blowing them with air, and are recovered by opening a valve 62. Hereby, the evaporated components exhausted from the vacuum heating furnace are subnstantially completely recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for recovering vaporized components discharged from a vacuum heating furnace. For example, dust captured by a dust collector in a steel factory contains zinc, lead, and the like in addition to iron. When iron is taken out from such dust and the dust is heated in a vacuum heating furnace, zinc, lead, and the like are discharged as evaporative components, so it is desirable to recover them. For example, in order to manufacture a sintered product of metal powder, a kneaded product of metal powder and a binder is molded into a predetermined shape, and the molded product is sintered in a vacuum heating furnace, the binder is discharged as an evaporation component. , It is desirable to collect this. The present invention relates to an apparatus for recovering the above vaporized components discharged from a vacuum heating furnace.

[0002]

2. Description of the Related Art Heretofore, as a device for recovering evaporative components discharged from a vacuum heating furnace, there has been proposed a device having a filter and a backwashing means for the filter therein (Actual Kaihei 4-7).
3937). However, this conventional device has a problem that a part of the evaporation component passes through the filter. As another recovery device, a water-cooled condensing chamber is provided at the upper part, a first vacuum chamber is partitioned at the lower part of the condensing chamber by an intermediate opening / closing door, and the intermediate opening / closing door and the opening / closing door are further provided at the lower part of the first vacuum chamber. It is proposed that a second vacuum chamber formed by partitioning is formed (Actual Kaihei 5-30149). However, this recovery device has a drawback that a part of the condensate of the evaporation component flows down from the first vacuum chamber by the air flow. When a part of the evaporative component passes through the filter or a part of the condensate of the evaporative component flows down from the first vacuum chamber, the recovery rate of the evaporative component is reduced by that much, and the vacuum pump connected to the downstream side has a lower recovery rate. Reduce ability.

[0003]

The problem to be solved by the present invention is that the conventional device has a low recovery rate of the vaporized components,
In addition, the capacity of the vacuum pump connected to the downstream side is reduced.

[0004]

According to the present invention, however, an evaporation component discharged from the vacuum heating furnace is interposed between the vacuum heating furnace and a vacuum pump for creating a vacuum atmosphere in the vacuum heating furnace. A device for recovering, comprising a water-cooled condenser and a filter connected to the downstream side of the condenser, the condenser is equipped with an opening / closing door at its lower part, and inside thereof A vacuum heating furnace characterized in that a movable member for scraping off the condensate of the vaporized component adhered to the wall surface is equipped, and the filter is equipped with a filter and a backwashing means for the filter therein. The present invention relates to a device for recovering evaporative components discharged from a device.

The recovery device of the present invention comprises a water-cooled condenser and a filter connected to the downstream side of the condenser. The recovery device of the present invention is interposed between a vacuum heating furnace and a vacuum pump that creates a vacuum atmosphere in the vacuum heating furnace. Therefore, in actual use, the upstream side of the condenser is a vacuum heating furnace. And the downstream side of the filter is connected to a vacuum pump.

The condenser is equipped with an opening / closing door at its lower part, and a movable member for scraping off the condensate of the vaporized components adhered to the wall surface is equipped inside thereof. Usually, a jacket in which cooling water can flow is provided around a cylindrical condenser whose upper part is hermetically sealed and whose lower part is equipped with an opening / closing door. In this case, a cylinder-driven disk or cylinder, or a motor-driven plate-like blade can be used as the movable member, but the evaporation component adhered to the inner wall surface of the condenser is agglomerated by advancing or retracting or rotating the movable member. In order to scrape off objects, the ends of these movable members are preferably brought into sliding contact with the inner wall surface of the condenser. The filter is equipped with a filter and means for backwashing the filter therein. A fine wire mesh can be used as the filter, and a backwashing means is provided with a header connected in multiple pipes and a plurality of nozzles attached to the header, and air is jetted from the nozzles to the filter. Any thing can be used.

A receiver is preferably attached to the lower part of the condenser through an enclosure of an opening / closing door. This is because the evaporative component can be continuously recovered, as described later in detail.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical cross-sectional view illustrating a recovery device of the present invention. Cylindrical condenser 1 with an upper part hermetically sealed and a lower part equipped with an opening / closing door 12 that moves back and forth by cylinder drive
1 is installed. A jacket (not shown) through which cooling water can flow is provided around the cylindrical surface of the condenser 11, a duct 31 is attached to the upper side surface of the condenser 11, and a vacuum (not shown) is provided on the upstream side of the duct 31. The heating furnace is connected. The condenser 11 is equipped with a circular plate 13 that moves up and down by a cylinder drive, and a circumferential end surface of the circular plate 13 is in sliding contact with the inner wall surface of the condenser 11. An enclosure 41 surrounding the forward / backward position (open / closed position) of the opening / closing door 12 is attached to the lower part of the condenser 11, and the enclosure 41 is connected to a vacuum pump 71 via a valve 61. A receiver 42 is attached with the condenser 11 facing directly above.

A duct 32 is attached to the lower side surface of the condenser 11, and a filter 51 is connected to the downstream side of the duct 32. Inside the filter 51, the upper part of which is hermetically sealed and the lower part of which the valve 61 is attached, a fine wire mesh 52 is stretched above the duct 32.
A header 53 connected in a multi-tubular shape is attached to the upper portion of the wire net 52. A plurality of nozzles (not shown) are attached to the header 53, and the base end portion of the nozzle is taken out of the filter 51. A duct 33 is attached to the upper side surface of the filter 51 above the wire mesh 52, and a vacuum pump 71 is connected to the downstream side of the duct 33.

Evaporative components discharged from a vacuum heating furnace (not shown) are condensed in a water-cooled condenser 11. Since most of the condensate adheres to the inner wall surface of the condenser 11, the condensate is scraped off by lowering the disk 13 by driving the cylinder, and dropped on the closed door 12. A part of the condensate flows down by the air flow, but these are the filters 51 on the downstream side.
It is captured by the wire mesh 52 stretched over. When the condensate accumulated on the closed open / close door 12 is dropped to the receiver 42, the vacuum pump 7 is installed in advance inside the enclosure 41 and the receiver 42.
Open the vacuum atmosphere at 1 and open / close the door 12 by driving the cylinder.
Retreat and open. After dropping the condensate into the receiver 42,
The opening / closing door 12 is moved forward and closed by driving the cylinder. When the condensate is filled in the receiver 42 by repeating the opening / closing operation, the enclosure 41 and the receiver 4 are closed with the opening / closing door 12 closed.
After the internal pressure of 2 is restored, the receiver 42 is removed from the enclosure 12 to collect the condensate. After collecting the condensate, the empty receiver 42 is attached to the enclosure 41. On the other hand, the condensate captured by the wire net 52 is blown off by blowing air from the header 53 and a nozzle (not shown) to the back surface of the wire net 52, and the valve 62 is opened to collect the condensate.

In the recovery device of the present invention, most of the evaporated components are recovered as the condensate by the upstream condenser, and a part of the condensate flowing down by the air flow is recovered by the downstream filter. The filter of the filter does not directly capture the vaporized component as it is, but captures its condensate, so that such condensate can be prevented from passing through the filter. Therefore, according to the present invention, the evaporated components can be almost completely recovered, and the capacity of the vacuum pump on the downstream side is not deteriorated.

Moreover, in the recovery apparatus of the present invention, since a part of the condensate flowing down by the air flow is captured by the filter of the filter as described above, it takes a long time until the filter needs to be backwashed. Therefore, according to the present invention, the evaporation component can be efficiently collected as much as the number of times of backwashing the filter is reduced. Particularly, according to the present invention in which the receiver is attached to the lower part of the condenser via the enclosure of the opening / closing door as shown in FIG. 1, the filter is continuously vaporized for a long time until the backwashing is required. Since the components can be collected, the evaporated components can be collected very efficiently.

[0013]

As is apparent from the above, according to the present invention described above, the vaporized components discharged from the vacuum heating furnace can be almost completely recovered, and therefore, the capacity of the vacuum pump on the downstream side is not deteriorated, and the vaporization is performed. The effect is that the components can be efficiently recovered.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view illustrating a recovery device of the present invention.

[Explanation of symbols]

11 ... Condenser, 12 ... Door, 13 ... Disc, 41 ... Enclosure, 42 ... Receiver, 51 ... Filter, 52 ... Wire mesh, 53 ... ..Headers, 71 ...
Vacuum pump

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area B22F 3/10 L

Claims (2)

[Claims] 1. A water-cooled condensing device, which is interposed between a vacuum heating furnace and a vacuum pump that creates a vacuum atmosphere in the vacuum heating furnace, and collects evaporative components discharged from the vacuum heating furnace. And a filter connected to the downstream side of the condenser, the condenser is equipped with an opening / closing door at the bottom thereof,
Further, a movable member for scraping off the condensate of the vaporized component adhered to the wall surface is provided inside the filter, and the filter is equipped with a filter and a backwashing means for the filter inside the filter. A device for recovering evaporative components discharged from a vacuum heating furnace. 2. The apparatus for recovering evaporative components discharged from a vacuum heating furnace according to claim 1, wherein a receiver is attached to a lower portion of the condenser via an enclosure of an opening / closing door.