JP2577096Y2 - Chrome mist removal device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chromium mist removing device.

[0002]

2. Description of the Related Art Conventionally, a chromium mist exhaust cleaning device that sucks toxic chromium gas or chrome mist generated from a chromium plating device or the like from an inlet, adsorbs the chromium gas or chrome mist on various adsorbents, and cleans the mist with spray water. There is.

Further, as disclosed in Japanese Utility Model Laid-Open Publication No. 52-132369, a box-shaped main body is divided and communicated with a washing room and a filtering room, and chromium gas and chrome mist sucked into the washing room are sprayed with water. Recovery function of chromium gas and chromium mist, which is configured so that the chromium gas and chromium mist remaining without being captured by the water are filtered by a multi-stage filter in a filtration chamber. There is a chrome mist exhaust cleaning device equipped with.

[0004]

However, although the concentration of chromium mist contained in the exhaust gas treated by such a device is certainly low, it depends on the condition of the adsorbent and the filter (for example, the degree of clogging). The chromium mist removal effect fluctuates, and immediately before such adsorbents or filters are washed or replaced, the removal effect is significantly inferior to the expected effect. Maintenance and inspection were necessary, and the time had to be determined, and the maintenance and inspection work was complicated.

[0005]

According to the present invention, a chromium gas suction cylinder is inserted into a ceiling plate of a removal case, and a lower end of the suction cylinder extends to a space in the removal case. A straightening plate is erected near the lower part, and a certain gap is held below the straightening plate with the bottom plate of the removal case, and the upper end of the straightening plate is inclined outward. A chrome mist removal device is provided in which a guide plate is continuously provided, an exhaust port is provided on a ceiling plate of the removal case almost above the inclined guide plate, and an appropriate amount of water is stored in the removal case. Things.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the entire structure of a chrome mist removing device M according to the present invention and a chrome mist exhaust cleaning device A used as a pre-process before using the chrome mist removing device M. FIG. FIG.

As shown in FIG. 1, a chrome mist exhaust cleaning device A is mounted on a base 10 and has a box-shaped cleaning tower 1.
And a suction duct 2 connected to one lower side of the washing tower 1 for sucking exhaust gas from the chromium plating apparatus C, and a platform on the ceiling plate 3 of the washing tower 1 for exhausting the washing gas from the washing tower 1. 4, an exhaust fan 5, a fan case 5a accommodating the fan 5, a ventilation duct 6 connecting the fan case 5a to the washing tower 1, and an exhaust fan protruding from an upper surface of the fan case 5a. It is composed of a cylinder 7.

In the figure, reference numeral 19 denotes an exhaust fan motor, and 11 denotes a liquid leakage prevention box for preventing liquid leakage of the chrome mist exhaust cleaning device A.

As shown in FIG. 2, the washing tower 1 is formed by vertically stacking two boxes having different sizes, an upper box forms a washing tank 1a, and a gas inlet 2a is provided on one side. And a gas exhaust port 12 is opened in the ceiling surface 3 so as to be connected to the ventilation duct 6.

The lower box forms a circulation tank 1b, in which circulation water is stored, and the circulation tank 1b and the washing tank are formed.
Water is circulated and supplied to the washing tank 1a by the circulation pump 8 through a pipe 20 provided at the upper part of the washing tank 1a.

The cleaning tank 1a contains an eliminator 13, upper and lower fillers 14, 15 and upper and lower spray nozzles 16, 17 and the like.
The eliminator 13 and the upper and lower fillers 14 and 15 that apply chromium mist contained in the chromium gas sent from the suction duct 2
Is passed through and absorbed by filtration, and is discharged as a cleaning gas.

The lower spray nozzle 17 is for washing out chromium mist adhering to the lower filler 15, and the upper spray nozzle 16 is for cleaning when the upper filler 14 becomes dirty. The supplied water is supplied by circulating the water stored in the circulation tank 1b with the circulation pump 8.

The washing tower 1 is made of vinyl chloride having high corrosion resistance.

The gist of the present invention relates to a chromium mist removal device M which performs a chrome mist removal operation in advance by the above-described chrome mist exhaust cleaning device A and treats chromium gas exhausted after the operation. That is, the washing tower 1
Separately, a chromium mist adsorbing water tank K is provided through an exhaust duct 9 to remove chrome mist that remains without being completely removed in the exhaust gas that has passed through the washing tower 1 with respect to its specific gravity settling property for air and water. The chromium mist is configured to be almost completely removed in the chromium mist adsorption water tank K by utilizing the affinity characteristics.

That is, as shown in FIGS. 3 and 4, the chromium mist removal device M comprises a chrome mist adsorption water tank K, and the chrome mist adsorption water tank K has a box-shaped removal case.
K1, a chrome mist suction cylinder 21 inserted in the center of the ceiling surface K2 of the case K1, two rectifying plates 24, 25 erected below the suction cylinder 21, and the suction cylinder 21. And exhaust pipes 26 and 27 projecting from exhaust ports 22 and 23 opened on both sides of the cylinder.

The removal case K1 has a box shape and stores an appropriate amount of water inside. A suction tube 21 is inserted into the center of the ceiling plate K2, and a space between the front and rear walls 28 and 29 is provided. Is the rectifying plate 2
4,25 are interposed.

The suction tube 21 communicates with the chrome mist exhaust cleaning device A through the exhaust duct 9, and is inserted into the center of the ceiling plate K2 of the removing case K1, and
The lower end of 21 extends to the space K3 in the removal case K1, and the height of the lower end is at the same level as the lower ends of the inclined guide plates 24a and 25a connected to the rectifying plates 24 and 25 described later. is there. The current plates 24 and 25 are provided below the exhaust ports 22 and 23 so as to divide the space K3 in the case 21 into three parts. Between the removal case K1 and the
30,31 and the case K1
The water stored inside has the same water level.

At the upper ends of the rectifying plates 24, 25, inclined guide plates 24a, 25a which are inclined outwardly, that is, toward the exhaust ports 22, 23, are continuously provided.

The inclined guide plates 24a, 25a guide the cleaning gas generated in the chromium mist adsorption water tank K to the exhaust pipes 26, 27 in order to smoothly discharge the cleaning gas into the atmosphere. That is, the chrome mist gas sucked from the chrome mist suction cylinder 21 is:
A small amount of chromium mist contained in the gas is adsorbed and removed by the water in the chromium mist adsorption water tank K to become a cleaning gas.
The gas is guided to the exhaust stacks 26 and 27 by a and 25a, and is smoothly discharged into the atmosphere.

The exhaust ports 22 and 23 are symmetrically opened on both sides of the suction cylinder 21 on the ceiling plate K2 of the removing case K1, and each of the inclined guide plates 24a and 25a in the case K1 is opened. It is located above.

The exhaust pipes 26 and 27 are formed in a substantially arc shape with the exhaust openings 26a and 27a facing outward, and discharge the cleaning gas discharged from the chromium mist adsorption water tank K into the atmosphere. , And are connected to the exhaust ports 22 and 23.

Here, the chromium mist removal process using the chrome mist exhaust cleaning device A and the chrome mist removal device M of the present invention as a pre-stage process will be described.

The chromium gas containing chromium mist discharged from the chromium plating apparatus C is sucked through the suction port 2a of the cleaning tower 1 of the exhaust cleaning apparatus A, and first passes through the eliminator 13. At this point, some chromium mist is adsorbed on the eliminator 13, and then the gas passes through the lower filler 15.

When the gas passes through the lower filler 15, most of the chromium mist is adsorbed. However, by attaching the gas to the upper filler 14, the chromium mist is almost removed.

Therefore, the gas discharged from the washing tower 1 is
Although the chromium mist is almost completely removed, a slight amount of chromium mist that has not been completely removed remains in the gas.

The gas containing a small amount of chromium mist is sucked from the washing tower 1 into the exhaust duct 9 by the exhaust fan, and the exhaust duct 9 extends upward once, and extends downward to form an inverted J-shape. Since the chromium mist has a higher specific gravity than air, the chromium mist is discharged in a state of falling toward a chrome mist adsorption water tank K provided below.

Since the chromium mist has a high affinity for water, the chromium mist that has fallen and is hit on the water surface is captured and adsorbed on the water by contact with water, and clean air from which the chromium mist has been removed is removed. Are guided to the rectifying plates 24, 25 and the inclined guide plates 24a, 25a, and are discharged into the atmosphere from exhaust pipes 26, 27 erected on both sides of the ceiling plate K2.

The processing data obtained by using the chromium mist removing device M of the present invention is stored in the chromium mist adsorbing water tank K.
At two points before and after passage, the sample was ingested for 60 minutes each, and this was measured by the atomic absorption method and the difenicalibasid method. 0.06mg / when exhausted from tower 1
those were m ³ had plummeted by 0.003 mg / m ³ at the time after passing through this Kuromisuto removing device M.

As described above, the effect of removing chromium mist is greatly improved as compared with the conventional chromium mist exhaust cleaning apparatus, so that it does not cause a pollution problem. It can greatly contribute to society by preventing adverse effects on health.

[0031]

The present invention comprises a chromium gas suction cylinder inserted into the ceiling plate of a removal case, a rectifying plate erected on the left and right below the suction cylinder, and an exhaust port opening to the ceiling plate above the rectifying plate. Chromium mist in the chromium gas discharged from the chrome plating device is almost completely removed by connecting the chromium mist removal device that stores an appropriate amount of water in the removal case to the chrome mist exhaust cleaning device. It is possible to prevent pollution and adversely affect the health of people working in plating plants and the like.

Further, even when the performance is deteriorated due to clogging or the like due to the frequency of use of the filler, the chromium mist can be removed stably, reliably and simply.

In the conventional chrome mist exhaust device,
The chrome mist also adhered to the outer peripheral portion of the exhaust port, which was bad in appearance. However, according to the present invention, such a problem can be solved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of a chromium mist removal device and a chrome mist exhaust cleaning device for pretreatment according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional front view of a chromium mist adsorption water tank.

FIG. 4 is a sectional view taken along the line aa in FIG. 3;

[Explanation of symbols]

 K1 Removal case K2 Ceiling plate K3 Space K4 Bottom plate 21 Suction cylinder 24,25 Rectifier plate 24a, 25a Inclined guide plate 30,31 Gap

Claims (1)

(57) [Scope of request for utility model registration] 1. A chromium gas suction tube (21) is inserted into a ceiling plate (K2) of a removal case (K1), and a lower end of the suction tube (21) is inserted into a space (K3) in the removal case (K1). And straightening plates (24) and (25) are provided upright in the vicinity of the lower part of the suction cylinder (21), and a removal case (K1) is provided below the straightening plates (24) and (25). )
A fixed gap (30), (31) is held between the bottom plate (K4) and the upper end of the rectifying plates (24), (25). ), (25a), and the ceiling plate of the removal case (K1) is located almost above the inclined guide plates (24a), (25a).
A chromium mist removal device provided with an exhaust port in (K2) and storing an appropriate amount of water in the removal case (K1).