JP4530574B2 - Floss processing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flossing apparatus for deinking, which removes ink and oil pitch contained in waste paper by attaching them to air bubbles in a used paper recovery facility that disaggregates and carefully selects used paper such as newspapers. The present invention relates to a processing apparatus.
[0002]
[Prior art]
Waste paper deinking methods include a floating method (flotation method) and a cleaning method (washing method), and a combination of these floating methods and cleaning methods. The floating method is a method in which air is mixed into a used paper raw material liquid that has been chemically treated after disaggregation, and the ink particles released are adsorbed to the generated bubbles to float and then separated and removed. The washing method is a method of washing away ink released with a large amount of water and removing it.
[0003]
FIG. 7 is a schematic view of a conventional deinking flotation device. FIG. 8 is a cross-sectional view of a deinking flotation device disclosed in Japanese Patent Application Laid-Open No. 3-130483 according to the application of the present patent applicant. In FIG. 7 and FIG. 8, common portions will be described with the same reference numerals. Reference numeral 1 denotes a raw material inlet, 2 denotes a raw material outlet, 3 denotes a bubble generating device, and 4 denotes a froth trough. Reference numeral 5 denotes a cell (floatator) comprising a cylindrical member 5a and end plates at both ends. 5d is a rectangular frame member projecting outward from the other side of the cylindrical member 5a, 5e is an upper cut surface on one side of the cylindrical member 5a, and 5f is a bottom plate of the projecting frame member 5d. The trough 4 is formed by 5d and the bottom plate 5f. 7 is a raw material liquid, 8 is a free liquid surface of the raw material liquid, 9 is a floss, 10 is a fine bubble, and 11 is a spiral streamline. The raw material inlet 1 is provided at one end of the flowator 5, and the raw material outlet 2 is provided at the other end of the cell 5 symmetrically with the raw material inlet 1. The bubble generating device 3 is horizontally arranged between the lower end plates in the flowator 5 and includes a turbine rotor 3a and an air supply pipe 3b provided close to the upper portion of the turbine rotor 3a.
[0004]
The raw material liquid 7 flows in from the raw material inlet 1 in the axial direction of the cylinder, changes in direction by approximately 90 °, and flows in the tangential direction to the bottom of one end of the floatator 5. The raw material liquid 7 that has flowed into the flowator 5 proceeds as it is with the inertial force at the time of inflow and reaches the bubble generating device 3, and the fine bubbles 10 are evenly mixed into the raw material liquid 7 by the bubble generating device 3. The raw material liquid 7 in which bubbles are mixed becomes a spiral streamline 11 due to centrifugal force and circulation action, reaches the free liquid surface 8 as an upward flow, and further flows in the direction of the froth trough 4 along the free liquid surface 8. During this time, the fine bubbles 10 become floss 9 and stay on the free liquid surface 8. In this manner, the mixing and separation of the raw material liquid 7 and the fine bubbles 10 are repeatedly performed. The raw material liquid 7 flows out from the raw material outlet 2 in a flow along the spiral streamline 11. The floss 9 staying on the free liquid level 8 overflows and flows down into the froth trough 4 and flows out to the storage tank 13 through the floss outflow pipe 12 as shown in FIG. The liquid defoamed in the storage tank 13 is sent to the secondary floater by a pump, and good quality fibers are collected.
[0005]
[Problems to be solved by the invention]
The flotation device for deinking is open to the atmosphere, and the floss is dripped only by the force of gravity and stored in the storage tank 13. Since the floss is defoamed, it takes a long time to process the floss, and the storage tank 13 Increases the equipment cost. Moreover, although the defoaming shower is used in the storage tank 13, since the flow rate increases by that amount, the load of the secondary flowator increases.
[0006]
The present invention was devised to solve the above-mentioned problems. When the floss passes through the floss outflow pipe, the floss outbreak pipe is promoted in the floss outflow pipe and connected to the tip of the floss outflow pipe. An object of the present invention is to provide a froth treatment apparatus capable of facilitating handling in the post-floss treatment process because the cyclone separator further separates liquid and air.
[0007]
[Means for Solving the Problems]
According to the floss treatment apparatus of the present invention, the floss outflow pipe connected to the floss outflow outlet of the hermetic pressure type flowtater, the reducer connected in the middle of the floss outflow pipe, and the gas liquid at the reducer outlet It consists of a gas separator and a cyclone separator that accepts the liquid.
[0008]
In addition, the above-mentioned froth treatment device is separated into a gas and liquid at the floss outlet pipe connected to the floss outlet of the hermetic pressure type flowtater, the reducer connected in the middle of the floss outlet pipe, and the reducer outlet. The Y-shaped pipe for guiding the liquid to the lower side and the air to the upper side, and the cyclone separator for receiving the Y-shaped pipe on the liquid side on the lower side and the Y-shaped pipe on the upstream side Is preferred.
[0009]
Next, the operation of the present invention will be described. Since a reducer is provided in the middle of the floss outlet pipe connected to the outlet of the hermetic pressure type flowtater, the flow velocity of the floss flow increases in the reducer, and the pressure rapidly decreases, so that the floss is broken and the floss becomes liquid. Separate into air. Also, the tip of the froth outflow pipe is a Y-shaped pipe, and a cyclone separator is provided that accepts the liquid-side pipe of the Y-shaped pipe at the bottom and the air-side pipe of the Y-shaped pipe at the top. (1) The air that has flowed into the upper part of the cyclone separator forms a swirling flow in the cyclone separator, and the bubble-like bubbles floating in the air are attached to the wall of the cyclone separator by the centrifugal force and fall down. The air from which is removed is released into the atmosphere from the top of the cyclone separator. (2) The liquid containing bubbles flowing into the lower part of the cyclone separator forms a swirl flow in the cyclone separator, and the bubbles contained in the liquid gather inside by the centrifugal force and separate from the liquid to form a floss. After staying on the upper surface of the glass, bubbles are broken. The liquid from which the bubbles are separated flows out from the lower part of the cyclone separator. Since the volume of the liquid flowing out from the lower part of the cyclone separator is extremely small compared to the volume of the floss, the processing becomes easy.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a froth processing apparatus according to the present invention. FIG. 2 is a cross-sectional view of a cyclone separator. FIG. 3 is a cross-sectional view of the upper portion of the hermetic pressure type flowator. FIG. 4 is a partial cross-sectional view of the reducer portion of the floss outlet pipe. The same parts as those shown in FIGS. 7 and 8 will be described with the same reference numerals. In FIGS. 1 to 4, reference numeral 15 denotes a hermetic pressure type flowator, which includes a cylindrical member 15a and end plates 15b and 15c at both ends. 15d is a floss outlet. Reference numeral 1 denotes a raw material inlet provided in the floatator 15, 2 denotes a raw material outlet, and 3 denotes a bubble generating device. Reference numeral 16 denotes a floss collecting pipe disposed along the longitudinal direction of the flowmeter 15 above the flowmeter 15. Reference numeral 16a denotes a long hole-shaped opening (slit) provided on the upper surface of the floss collecting tube 16, and reference numeral 16b denotes a floss inflow member provided so as to protrude upward on both sides of the opening 16a. The floss collecting pipe 16 collects the floss 9 floating in the flowator 15 through the floss inflow member 16 b and the opening 16 a and flows it down to the floss outflow pipe 17.
[0011]
The floss outflow pipe 17 includes a large diameter pipe 17a having a base end connected to the outlet 15d of the floatator 15, a Y-shaped pipe 17c having a tip branched in a Y shape, and a large diameter pipe 17a and a Y-shaped pipe 17c. And a reducer 17b connected via a flange 18 in the middle. As shown in FIG. 4, the reducer 17b has one end having the same diameter as the large-diameter pipe 17a and the other end having the same diameter as the base end of the Y-shaped pipe 17c. The side is narrowed down. When the floss 9 passes through the reducer 17 b, the flow velocity becomes high at the throttle portion of the reducer 17 b, the pressure is suddenly reduced, the floss 9 is broken, and the liquid 24 and the air 23 are separated. The separated liquid 24 flows down the cyclone separator 19 through the liquid side pipe 17e of the Y-shaped pipe 17c, and the air 20 passes above the cyclone separator 19 through the air side pipe 17d of the Y-shaped pipe 17c. Is released. The cyclone separator 19 has a cylindrical shape at the top and a reverse truncated cone shape at the bottom. The cyclone separator 19 has a liquid discharge pipe 21 connected to the lower end via a valve 22 and an air discharge pipe 20 connected to the upper end.
[0012]
Next, the operation based on the embodiment will be described. Since the reducer 17b is provided in the middle of the floss outlet pipe 17 connected to the outlet 15d of the hermetic pressure type flowator 15, the flow rate of the floss flow increases in the reducer 17b, and the pressure suddenly decreases. Then, the floss 9 is separated into the liquid 24 and the air 23. The tip of the froth outflow pipe 17 is a Y-shaped pipe 17c. The liquid-side pipe 17e of the Y-shaped pipe 17c is received at the lower part, and the air-side pipe 17d of the Y-shaped pipe 17c is received at the upper part. Since the cyclone separator 19 is provided, (1) the air 23 flowing into the upper part of the cyclone separator 19 forms a swirling flow in the cyclone separator 19, and the bubble-shaped bubbles floating in the air 23 are caused by the centrifugal force. The air 23 attached to the wall surface 19 of the cyclone separator 19 and descending is removed from the air discharge pipe 20 above the cyclone separator 19 to the atmosphere. (2) The liquid 24a containing bubbles flowing into the lower part of the cyclone separator 19 forms a swirling flow in the cyclone separator 19, and the bubbles contained in the liquid 24a are gathered inside by the action of centrifugal force and separated from the liquid 24b. The floss 24a is formed and bubbles are broken after staying on the upper surface of the swirling flow. The liquid 24b from which the bubbles have been separated flows out from the liquid discharge pipe 21 below the cyclone separator 19. Since the high quality fiber is contained in the liquid 26b, it is reprocessed by a secondary flowator (not shown), the accept is returned to the raw material inlet 1 of the floatator 15, and the reject is discarded outside. Since the volume of the liquid 24b flowing out from the lower part of the liquid discharge pipe 21 is extremely smaller than the volume of the floss 9, the processing becomes easy.
[0013]
Next, experimental results for demonstrating the effects of the present invention will be described. FIG. 5 is a diagram showing a change in the amount of air mixed in the hermetic pressure type flotator floss. In FIG. 5, the left frame shows the location, the center shows the shape and the right frame shows the aeration capacity ratio (%). FIG. 6 is a diagram showing the flow rates of liquid and air guided to the cyclone separator. In FIG. 6, the left frame shows the place, and the right frame shows the speed (m / sec). The flow rates of liquid and air are as follows: air (air) supply part g, air swirl speed (outermost peripheral part) m in the cyclone separator, liquid (floss) supply part d, liquid swirl speed n in the cyclone separator, liquid discharge part f Measured with
[0014]
As a result, the air mixing volume ratio (%) was 97.2% at the floss inlet a and 32.2% at the cyclone separator (separation tank) outlet f. Therefore, if the volume of the floss in a is 100, the volume of the liquid mixed with air in f is 4.1, which is contracted to 1 / 24.4. If the air mixing capacity ratio is 40% or less, the liquid mixed with air can be pumped as it is.
[0015]
In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention. For example, the shape of the floatator may not be as shown in FIG. In addition, a Y-shaped pipe is arranged between the reducer and the cyclone separator, but instead of the Y-shaped pipe, the reducer outlet and the cyclone separator are connected by a straight pipe, and gas and liquid are sent to the cyclone separator at the same time. May be.
[0016]
【The invention's effect】
According to the above-described floss treatment device of the present invention, since the reducer is provided in the middle of the floss outflow pipe connected to the outlet of the hermetic pressure type floatator, when the floss passes through the floss outflow pipe, In addition to promoting bubble breaking, the cyclone separator connected to the tip of the froth outflow pipe further separates liquid and air, so that it has excellent effects such as easy handling in the post-floss treatment process. .
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a froth processing apparatus according to the present invention.
FIG. 2 is a cross-sectional view of a cyclone separator.
FIG. 3 is a cross-sectional view of the upper portion of the hermetically pressurized flow type floater of FIG. 1;
4 is a partial cross-sectional view of the floss outlet pipe of FIG. 1. FIG.
FIG. 5 is a diagram showing a change in the amount of air mixed in the hermetic pressure type floatator floss.
FIG. 6 is a diagram showing flow rates of liquid and air guided to a cyclone separator.
FIG. 7 is a schematic diagram of a conventional deinking flotation device.
FIG. 8 is a cross-sectional view of a deinking flotation device disclosed in Japanese Patent Laid-Open No. 3-130483.
[Explanation of symbols]
15 Sealed Pressurization Type Flotator 16 Floss Collection Pipe 16a Opening 16b Floss Inflow Member 17 Floss Outflow Pipe 17a Large Diameter Pipe 17b Reducer 17c Y-shaped Pipe 17d Air Pipe 17e Liquid Pipe 19 Cyclone Separator 23 Air 24 Liquid

Claims (1)

A floss outflow pipe connected to the floss outlet of the hermetic pressure type floatator, a reducer connected to the floss outflow pipe that reduces the diameter of the pipe, and a liquid separated into gas and liquid at the reducer outlet A Y-shaped pipe that leads the pipe upward and a cyclone separator that accepts the Y-shaped pipe on the liquid side at the bottom and the air-side pipe on the Y-shaped pipe at the top. As the pressure rises, the pressure drops to break up and separate into liquid and air, and bubbles floating in the air that flows into the upper part of the cyclone separator adhere to the wall surface by centrifugal force and break down. and, froth bubbles contained in the liquid that has flowed into the lower cyclone separator, characterized in that is adapted to defoaming after the formation of the floss gathered inward by the centrifugal force Management apparatus.

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