JP2011183314A - Chemical injection apparatus and operation method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemical injection apparatus that prevents tubes from being blocked by allowing chemicals such as polymeric flocculant to be swollen and an operation method of the same. <P>SOLUTION: Water is supplied into a stirring device 1 through a ball valve 60, a supply water line 61, a supply water pump 62, and a line 63. Stock solution is supplied into the supply water line 61 through a ball valve 80, a stock solution pump 81, a line 82, a three-way valve 83, and a line 84, The stock solution and water are stirred in the stirring device 1 into a solution, and this solution is added to a flocculation treating facility through lines 64, 67, and 69. When a chemical injection is stopped, a part of the delivered solution from the pump 62 is circulated through lines 85, 84. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drug injection device for diluting a drug such as a polymer flocculant with a liquid such as water and injecting the drug into water to be treated, and an operation method thereof.

  When injecting (adding) the polymer flocculant into the water to be treated, the polymer flocculant is often injected after being diluted with water. Since the polymer flocculant is usually composed of several million or more polymers, the polymer flocculant swells when dissolved or diluted in water, and the pipe is easily clogged.

  Japanese Patent Application Laid-Open No. 10-57790 describes that a polymer chemical solution is supplied to a pipe through which dilution water flows through a check valve. By providing the check valve, the dilution water is prevented from flowing back to the polymer chemical liquid line, and the swelling is not generated.

JP-A-10-57790

  In the drug injection device of Patent Document 1, when the flow of dilution water stops, the polymer chemical liquid remaining on the dilution water pipe side of the supply pipe of the polymer chemical liquid swells more than the check valve, and the pipe is There is a risk of blockage.

  An object of this invention is to provide the chemical | medical agent injection | pouring apparatus with which chemical | medical agents, such as a polymer flocculent, swell, and a piping is obstruct | occluded, and its operating method.

  The drug injection device of the present invention (Claim 1) includes a first pipe through which a diluent is transferred, a pump in which the end of the first pipe is connected to the suction port, and a second pipe in which one end is connected to the discharge port of the pump. A stirring and mixing unit having the other end of the second pipe connected to the liquid inlet, a third pipe for flowing out the mixed solution connected to the outlet of the stirring and mixing unit, and one end connected to the first pipe. A three-way valve having a fourth pipe for supplying medicine, first, second, and third ports, and having the other end of the fourth pipe connected to the third port; the second port; A fifth pipe communicating with the second pipe and a sixth pipe for supplying a medicine connected to the first port are provided.

  According to a second aspect of the present invention, there is provided the medicine injection device according to the first aspect, further comprising a seventh pipe that communicates between the middle of the third pipe and the upstream side of the connection portion of the fourth pipe in the first pipe. It is a feature.

  The drug injection device according to claim 3 is characterized in that, in claim 1 or 2, a drain line branches off from the third pipe.

  The operation method of the drug injection device according to the present invention (Claim 4) is the operation method of the drug injection device according to any one of claims 1 to 3, wherein the first port and the third port of the three-way valve The second port and the first and third ports are disconnected, the pump and the stirring and mixing means are operated, the diluent is supplied to the first pipe, and the sixth pipe And a chemical injection step of adding a drug to the first pipe through the fourth pipe and causing the drug mixed diluent to flow out of the third pipe, and communicating the second port and the third port of the three-way valve, The communication between the first port and the second and third ports is cut off, the pump and the stirring and mixing means are operated, the supply of the chemical to the sixth pipe is stopped, and the diluent is supplied to the first pipe Then, a part of the pump discharge liquid is circulated in the order of the second pipe, the fifth pipe, the three-way valve, the fourth pipe, and the first pipe. It is characterized in performing the dosing stop step for.

  The operation method of the drug injection device according to claim 5 is the operation method of the drug injection device according to claim 4, wherein the first port and the third port of the three-way valve are communicated, and the second port and the second port are connected. The communication with the 1st and 3rd ports is cut off, the pump and the stirring and mixing means are operated, the diluent is supplied to the 1st pipe, and the drug is supplied to the 1st pipe through the 6th pipe and the 4th pipe. And a chemical injection step for adding the drug mixture diluent from the third pipe to communicate with the second port and the third port of the three-way valve, and the first port, the second and third ports, , The pump and the stirring and mixing means are operated, the supply of the chemical to the sixth pipe is stopped, the diluent is supplied to the first pipe, and a part of the pump discharge liquid is supplied to the second pipe. , Circulate in the order of the 5th pipe, 3 way valve, 4th pipe and 1st pipe It is characterized in that to perform the stirring and mixing means and the third pipe and dosing stop step of discharging through the drain line.

  When drug injection is performed with the drug injection device of the present invention, the first port and the third port of the three-way valve are communicated, and the communication between the second port and the first and third ports is blocked. Then, a chemical injection process is performed in which the pump and the agitation and mixing means are operated, the chemical is supplied from the sixth pipe, the diluent is supplied from the first pipe, and the chemical diluent is flowed out from the third pipe. In the state where the medicine injection is stopped, the second port and the third port of the three-way valve are communicated, the communication between the first port and the second and third ports is blocked, and the pump and The stirring and mixing means is operated, the supply of the chemical to the sixth pipe is stopped, the diluent is supplied from the first pipe, and a part of the pump discharge liquid is supplied to the second pipe, the fifth pipe, the three-way valve, and the fourth pipe. And it is made to circulate in order of 1st piping. In this chemical injection stopping process, since the liquid circulates in the order of the pump, the second pipe, the fifth pipe, the three-way valve, the fourth pipe, and the first pipe, the liquid does not stay in the fourth pipe that is most likely to be blocked. . Therefore, stable operation can be performed without causing a blockage trouble in the apparatus.

  In addition, when a return line is provided as in claim 2, it is possible to finely control the supply amount of the stirred and mixed liquid.

  When the drain line is provided as in the third aspect, the remaining portion of the pump discharge liquid can be discharged out of the system through the drain line in the chemical injection stopping process as in the fifth aspect.

It is a flow figure of the medicine injection device concerning an embodiment. It is a longitudinal cross-sectional view of the stirring apparatus used for the chemical injection device which concerns on embodiment. (A) is a perspective view of a stator, and (b) is a plan view of the stator.

  Hereinafter, with reference to FIGS. 1 to 3, a drug injection device and an operation method thereof according to the embodiment will be described. First, with reference to FIG. 2 and FIG. 3, the structure of the stirring apparatus 1 as the stirring and mixing means used in this embodiment will be described.

  The stirrer is provided on a cylindrical housing, disk-shaped rotors and stators alternately arranged in the housing at intervals in the cylinder axial direction of the housing, and one end of the housing. The stator has a discharge portion provided on the other end side of the housing, and the stator has an outer peripheral portion connected to the inner peripheral surface of the housing, and has an opening at the center. A rotating shaft is disposed in the axial direction of the rotor, and the rotor is supported by the rotating shaft. In the stirring device, an odd number of the stators are disposed, and a rotor is disposed between the stators. The opening of the stator on one end side in the cylinder axis direction is an introduction portion, and the opening of the stator on the other end side is a discharge portion.

  In this stirring device, the liquid is stirred between the rotor and the stator by rotating the rotor. As the rotor rotates, the liquid in the housing swirls to generate centrifugal force. However, since the introduction part and the discharge part are located at the center of the stator, the liquid in the housing is directed from the introduction part to the discharge part. There is no flow in (or the opposite direction). The liquid in the housing flows from the introduction part to the discharge part exclusively by the discharge pressure of the pump. Therefore, even if the number of rotations of the rotor is changed to control the stirring force, the amount of liquid fed by the pump does not vary. However, the pharmaceutical injection device of the present invention may employ a stirring device other than this stirring device.

  As shown in FIG. 2, the stirring device 1 includes a cylindrical housing 10, a stator 20 and a rotor 30 disposed in the housing 10, a rotating shaft 40 disposed at the axial center position of the housing, and the rotating shaft. The motor 50 etc. which continue to 40 are provided.

  The housing 10 includes a cylindrical portion 11, a lower end plate 12, and an upper end plate 13. As in this embodiment, the housing 10 preferably has a cylindrical axis center in the vertical direction, but the axis direction may be horizontal or diagonal. An inflow chamber 15 is formed between the lower end plate 12 and the lowermost stator 20 (20a), and an outflow chamber 16 is formed between the upper end plate 13 and the uppermost stator 20 (20c). ing. An inflow port 14 communicating with the inflow chamber 15 and an outflow port 17 communicating with the outflow chamber 16 are provided in the cylindrical portion 11 of the housing.

  An odd number (three in FIG. 2) of stators 20 (20a, 20b, 20c) are arranged in the housing 10. Each stator 20 has a disk shape having an opening 21 at the center, and the outer peripheral edge is fixed to the inner peripheral surface of the housing 10 by welding or the like. In this embodiment, the diameter of the opening 21 of each stator 20 is the same. The opening 21 (21a) of the lowermost stator 20a is an introduction part, and the opening 21 (21c) of the uppermost stator 20c is a discharge part.

  Pins 22, 23, or 24 are provided upright on the upper surface of the lowermost stator 20a, the lower surface of the uppermost stator 20c, and the upper and lower surfaces of the intermediate stator 20b, respectively. As shown in FIG. 3, the pins 22 on the upper surfaces of the stators 20 a and 20 b are located at an equal radius from the axis of the housing 10, and are arranged at regular intervals in the circumferential direction along the periphery of the opening 21. Yes. Further, the pins 23 are located at an equal radius from the axis of the housing 10 and are arranged at regular intervals in the circumferential direction near the outer peripheral edges of the upper surfaces of the stators 20a and 20b. The pins 24 on the lower surfaces of the stators 20b and 20c are located at an equal radius from the axial center of the housing 10, and are arranged at regular intervals in the circumferential direction substantially in the middle between the periphery of the opening 21 and the outer periphery of each stator 20b and 20c. Has been.

  A rotary shaft 40 is inserted through the openings 21 of the stators 20b and 20c, and a rotor 30 (30a and 30b) is attached to the rotary shaft 40. The rotating shaft 40 is rotatably supported by the housing 10 via a bearing 41. The rotating shaft 40 extends outside the housing 10 through the upper end plate 13.

  The rotor 30a is located between the stators 20a and 20b, and the rotor 30b is located between the stators 20b and 20c. The diameter of each rotor 30 is smaller than the inner diameter of the housing 11, and there is a gap through which fluid passes between the outer periphery of the rotor 30 and the inner peripheral surface of the housing 11. There is also a predetermined gap between the plate surface of each rotor 30 and each stator 20. The height of the gap above and below the rotor 30 is substantially equal.

  A plurality of pins 31 and 32 are erected on the upper surface of the rotor 30, and a plurality of pins 33 are erected on the lower surface. Each pin 31 is located at an equal radius from the rotary shaft 40 and is disposed at a constant interval in the circumferential direction. Each pin 32 is also located at an equal radius from the rotating shaft 40 and is disposed at a constant interval in the circumferential direction. Each pin 33 is also located at an equal radius from the rotary shaft 40 and is arranged at a constant interval in the circumferential direction.

  In this embodiment, the pin 31 and the pin 22 are located at an equal radius from the axis of the housing 10. The pin 32 and the pin 23 are located at an equal radius from the axis of the housing 10. The pin 33 and the pin 24 are located at an equal radius from the axis of the housing 10. When the rotary shaft 40 rotates, the pin 33 circulates between the circumferential row of the pins 22 and the circumferential row of the pins 23, and the pin 31 circulates on the inner peripheral side of the circumferential row of the pins 24. The pin 32 circulates on the outer peripheral side of the circumferential row of the pins 24.

  When a plurality of types of liquids are mixed using the stirring device 1, these liquids are supplied from the inflow port 14 into the inflow chamber 15 through the pump 62 and the inflow line 63, and each rotor 30 is driven by a motor. Rotate at 50. This liquid flows from the inflow chamber 15 between the opening 21 of the stator 20a, between the stator 20a and the rotor 30a, between the outer periphery of the rotor 30a and the inner peripheral surface of the housing 10, between the rotor 30a and the stator 20b, and between the stator 20b. Opening 21, between stator 20 b and rotor 30 b, between rotor 30 b and inner peripheral surface of housing 10, between rotor 30 b and stator 20 c, opening 21 of stator 20 c, outflow chamber 16, and outlet 17. Flow and sent out to take-out line 64.

  Since each rotor 30 and the stator 20 are provided with pins 31 to 33 and 22 to 24, shearing stress is applied to the liquid as the rotor 30 rotates, and the liquid is sufficiently stirred.

  As the rotor 30 rotates, the liquid in the housing 10 turns, so that centrifugal force is applied to the liquid in the housing. However, the opening 21a as the introduction portion and the opening 21c as the discharge portion are the axial centers of the housing 10. Therefore, the liquid in the housing 10 does not flow in the direction (or the opposite direction) from the opening 21a as the introduction portion to the opening 21b as the discharge portion. The liquid in the housing 10 flows from the inlet 14 toward the outlet 17 exclusively by the discharge pressure of the pump 62. Therefore, even if the rotational speed of the rotor 30 is varied to control the stirring force, there is no or little variation in the amount of liquid fed by the pump 62 (the amount of liquid passing through the housing 10).

  Moreover, since each pin 22-24, 31-33 is cylindrical shape, even if it rotates the rotor 30 at high speed, the shear force which the pins 22-24, 31-33 give to the polymer chain of a polymer component is small, and polymer It is prevented or suppressed that the polymer chain is broken. Therefore, for example, deterioration of the characteristics of the polymer flocculant is prevented.

  In this embodiment, the inflow chamber 15 is provided on the lower side of the stator 20a, the outflow chamber 16 is provided on the upper side of the stator 20c, and the inlet 14 and the outlet 17 are provided on these side peripheral surfaces. The effect of the swirling flow generated between the stator 20 and the stator 20 hardly reaches the inlet 14 and the outlet 17, and the liquid flows stably.

  FIG. 1 shows an embodiment of a drug injection device for dissolving a liquid polymer (polymer) flocculant (hereinafter sometimes referred to as a stock solution) in water using the stirring device 1 configured as described above. I will explain.

  In this medicine injection device, a water supply line 61 is provided as a first pipe for supplying water as a diluent, and the end of the line 61 is connected to a suction port of a pump 62. A ball valve 60 is provided upstream of the line 61. The discharge port of the pump 62 is connected to the inlet 14 (FIG. 3) of the stirring apparatus 1 via the line 63 as a second pipe.

  A line 64 is connected to the outlet 17 of the stirring device 1. The line 64 is provided with a flow meter 65 and a flow rate adjusting valve 66. The outflow side of the flow rate adjusting valve 66 is connected to the agglomeration processing facility via a line 67 for flowing out the agitation and mixed water, a motor operated valve 68, a line 69, and a valve 70 so as to allow chemical injection. The lines 64, 67, and 69 constitute a third pipe.

  A drain line 73 branches from the line 67, and an electric valve 74 and a valve 75 are provided in the drain line 73.

  One end of a line 84 as a fourth pipe is connected in the middle of the water supply line 61, and the other end of the line 84 is connected to a third port of the three-way valve 83. A line 82 as a sixth pipe is connected to the first port of the three-way valve 83, and a ball valve 80 and a pump 81 for supplying a drug (stock solution) are provided on the line 82.

  The second port of the three-way valve 83 and the middle of the line 63 are communicated by a line 85 as a fifth pipe.

  One end of a return line 71 serving as a seventh pipe is connected to the vicinity of the outlet of the stirring device 1 (upstream from the flow meter 65). A valve 72 is provided in the return line 71. The other end of the return line 71 is connected to the upstream side of the connecting portion with the line 84 and the downstream side of the ball valve 60 in the water supply line 61.

  The detection signal of the flow meter 65 is input to the control panel 90. Further, a signal from the control panel 90 is given to the inverter controllers 62a and 81a of the pumps 62 and 81, and the rotational speeds of the pumps 62 and 81 are controlled. The three-way valve 83, the flow rate adjusting valve 66, and the electric valves 68 and 74 are also controlled for opening / closing or opening by the signals from the control panel 90.

  FIG. 1 (a) shows a flow when the opening degree of the flow control valve 66 is increased and the amount of chemical injection is increased. Water flows through the ball valve 60, the water supply line 61, the water supply pump 62, and the line 63. And supplied to the inlet 14 of the stirring device 1. The stock solution is added to the water supply line 61 (that is, the suction side of the pump 62) via the ball valve 80, the stock solution pump 81, the line 82, the three-way valve 83, and the line 84. The stock solution and water are stirred by the stirrer 1 to obtain stock solution mixed dilution water. This stock solution mixed dilution water is taken out via the take-out line 64, the flow rate is measured by a flow meter (FS) 65, and a flow control valve ( FCV) 66, line 67, electric valve 68, line 69 and valve 70 are added to the agglomeration processing facility.

  FIG. 1 (b) is a flow when the amount of chemical injection is reduced by narrowing the opening of the flow control valve 66, and a part of the stock solution mixed dilution water from the stirring device 1 is returned from the line 64. It is returned to the water supply line 61 via the line 71 and the valve 72.

  1A and 1B, the three-way valve 83 communicates with the lines 82 and 84, and the line 85 is disconnected from the lines 82 and 84. The valve 74 is closed. Even if the number of rotations of the motor 50 is changed (increase / decrease) in the state of FIGS. 1 (a) and 1 (b), the amount of liquid passing through the stirring device 1 does not vary, and therefore the amount of liquid fed is affected. The intensity of stirring can be adjusted without any problems.

  Thus, by controlling the rotation speed of the pump 62 and the opening degree of the electric valve 68 by the signal from the control panel 90, it becomes possible to control the flow rate with the maximum capacity of the pump 62 as the upper limit. .

  In the flow of FIG. 1 (c) in which the medicine injection is stopped, the three-way valve 83 communicates the lines 84 and 85 and disconnects the line 82 from the lines 84 and 85. As a result, the stock solution is not added to the water supply, but only water is supplied to the water supply line 61, and a part of the liquid discharged from the pump 62 is circulated through a loop composed of the lines 63, 85, 84, 61 and the pump 62. This is to prevent solidification due to stagnation in the lines 84, 61, 63 and the pump 62 in a state where the stock solution does not sufficiently dissolve with water. In general, when diluting a polymer with dilution water, if the polymer concentration in the drug injection after dilution is excessively high, a polymer gel-like substance is generated, and this gel-like substance accumulates in the mixer or piping. Prevents smooth liquid delivery, and closes the piping when it is remarkable. According to this embodiment, such a situation is prevented.

  In this embodiment, water supply is performed even when chemical injection is stopped, the electric valve 68 is closed, and the electric valve 74 and the valve 75 are opened, so that the remaining portion of the discharge liquid of the pump 62 is connected to the system via the drain line 73. Drain outside. Thereby, the liquid which does not contain a chemical | medical agent will not be added to the agglomeration processing equipment.

  According to the stirring device of this embodiment, the following various effects can be obtained in addition to the above.

  The dissolution tank is unnecessary or downsized, and the installation space can be reduced.

  All the motor power is used for agitation. Since the stirring power is strong, the dispersion of the polymer flocculant is good.

  Since there is no pump effect, it can be installed in the middle of existing piping.

  Since there is no pump effect, it is possible to install a plurality of stirring devices in multiple stages as required.

  The pump unit for controlling the flow rate and the agitation unit for controlling the agitation force can be controlled independently, and the injection control under the optimum conditions is possible according to the properties of the stock solution and the injection conditions.

  Dissolution under high pressure conditions is also possible, and dissolution time can be shortened.

  It can be used widely as an in-line type dissolution apparatus not only for emulsion polymers but also for food and chemical fields. It is also possible to mix and disperse powders that are difficult to disperse in water, such as diatomaceous earth and powdered activated carbon.

  The above embodiment is an example of the present invention, and the present invention may have a configuration other than that illustrated. For example, the number of rotors and stators of the stirring device 1 may be other than that illustrated. Further, the pin is not limited to a cylindrical shape, and may be an elliptical cylindrical shape or a shape similar to them. The outer peripheral edge of the rotor and the inner peripheral edge of the stator may be chamfered. The number of pin rows is not limited to that shown in the figure. As the stirring device, various static mixers other than those shown in FIGS. 2 and 3, a stirring blade type stirring device, and the like can be used.

  Further, the drug injection device shown in FIG. 1 can be used not only as a coagulant dissolving device but also as a device for dissolving various chemicals and mixing and dispersing powders and slurries.

DESCRIPTION OF SYMBOLS 1 Stirring apparatus 10 Housing 11 Cylindrical body 12, 13 End plate 14 Inlet 15 Inlet chamber 16 Outlet chamber 17 Outlet 20 (20a, 20b, 20c) Stator 21 (21a) Opening (introduction part)
21 (21b) Opening 21 (21c) Opening (discharge part)
22-24 pin 30 (30a, 30b) rotor 31-33 pin 40 rotating shaft 50 motor 62, 81 pump 61 water supply line (first piping)
63 lines (second pipe)
63, 67, 69 lines (3rd piping)
71 Return line (seventh piping)
73 Drain line 82 line (6th piping)
84 lines (4th piping)
85 lines (5th piping)

Claims (5)

A first pipe through which the diluent is transferred;
A pump whose end of the first pipe is connected to the suction port;
A second pipe having one end connected to the discharge port of the pump;
Stirring and mixing means having the other end of the second pipe connected to the liquid inlet;
A third pipe for the outflow of the mixed liquid connected to the outlet of the stirring and mixing means;
A fourth pipe for supplying medicine, one end of which is connected to the first pipe;
A three-way valve having first, second and third ports, the other end of the fourth pipe being connected to the third port;
A fifth pipe communicating the second port and the second pipe;
A drug injection device comprising: a sixth pipe for drug supply connected to the first port.   The drug injection device according to claim 1, further comprising a seventh pipe communicating between the middle of the third pipe and an upstream side of a connection portion of the fourth pipe in the first pipe.   The drug injection device according to claim 1 or 2, wherein a drain line branches off from the third pipe. A method for operating the pharmaceutical injection device according to any one of claims 1 to 3,
The first port and the third port of the three-way valve are communicated, the communication between the second port and the first and third ports is shut off, the pump and the agitation and mixing means are operated, and the first A chemical injection step of supplying a diluent to the pipe, adding a drug to the first pipe via the sixth pipe and the fourth pipe, and causing the drug mixed diluent to flow out from the third pipe;
The second port and the third port of the three-way valve are communicated, the communication between the first port and the second and third ports is shut off, the pump and the stirring and mixing means are operated, Stop the supply of chemicals to the pipe, supply the diluent to the first pipe, and circulate a part of the pump discharge liquid in the order of the second pipe, the fifth pipe, the three-way valve, the fourth pipe, and the first pipe. A method for operating the drug injection device, wherein the drug injection stopping step is executed. A method for operating the drug injection device according to claim 4,
The first port and the third port of the three-way valve are communicated, the communication between the second port and the first and third ports is shut off, the pump and the agitation and mixing means are operated, and the first A chemical injection step of supplying a diluent to the pipe, adding a drug to the first pipe via the sixth pipe and the fourth pipe, and causing the drug mixed diluent to flow out from the third pipe;
The second port and the third port of the three-way valve are communicated, the communication between the first port and the second and third ports is shut off, the pump and the stirring and mixing means are operated, Stop the supply of chemicals to the pipe, supply the diluent to the first pipe, and circulate a part of the pump discharge liquid in the order of the second pipe, the fifth pipe, the three-way valve, the fourth pipe, and the first pipe. And a medicine injection stopping step of discharging the remaining portion of the pump discharge liquid through the stirring and mixing means, the third pipe, and the drain line.

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