JP2017186913A - Management method for vertical sinking type vortex pump and management system for vertical sinking type vortex pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a positive operation*management of maintenance of a vertical sinking type vortex pump assuring abrasion resistance property.SOLUTION: This invention relates to a management method for a vertical sinking type vortex pump 100 for transferring molten material of exudation residual of 110°C or higher and 150°C or less with main component of sulfur having metallic sulfide exudated chloride to a batch type filter device 30. The management method comprises a step for adjusting an inverter frequency and starting an operation of the pump to cause a current value of an electric motor 102 for the pump to become a set value after installation of the pump; a step for measuring liquid application time from a charging of molten exudation residual of molten material just after starting an operation of the pump to a time in which a liquid pressure at an input side of the batch type filter device is increased to a set value and setting the measured time as a standard time; and a step for increasing the inverter frequency to cause the liquid application time to become the same as the standard time when the liquid application time is judged to be longer than the standard time upon comparison between the liquid application time and the standard time.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a management method for a saddle-type sinking centrifugal pump and a management system for a saddle-sinking centrifugal pump.

  Generally, a vertical sink pump is a pump that immerses a pump body having an impeller and a casing in a liquid and pumps the liquid. The vertical sink pump is often used with a self-contained pump or the like when the pump must be fixed at a position higher than the liquid level of the liquid to be pumped, such as an embedded tank.

  Compared with self-contained pumps, this vertical sink pump has a shaft seal position higher than the liquid level, so there is no liquid leakage from the shaft seal and no priming is required. Since the pump body is soaked in the liquid, the pump body is widely used in the entire industry because it has characteristics such as no cavitation that entraps bubbles.

  For example, in nickel smelting, sulfides containing nickel and cobalt are leached using the oxidizing action of chlorine gas, and the leached nickel ions and cobalt ions are produced as electric nickel and electric cobalt by electrowinning. Chlorine leaching process is in practical use. In this chlorine leaching process, a chlorine leaching residue containing sulfides and oxides containing sulfur as a main component and containing a trace amount of undissolved metal, which has not been leached using the oxidizing action of chlorine gas, is produced.

  The obtained chlorine leaching residue is heated to a temperature exceeding the melting point of sulfur to become a liquid melt, and the melt is filtered by a filtration device to convert the solid sulfur from solid sulfur and The oxide is separated and product sulfur is recovered from the chlorine leaching residue. Under special operating conditions where solids precipitate due to a decrease in the temperature of the melt, it is necessary to keep the pump and piping warm and warm. Become. For this reason, in addition to the features of the vertical sinking centrifugal pump described above, the vertical sinking centrifugal pump is the simplest and most reasonable method for immersing the pump body in the melt. It is applied as a pump that sends things to the filtration device.

Since the melt obtained from the chlorine leaching residue contains solid metal sulfides and oxides, there is a problem that the components of the wetted part such as the impeller and casing of the pump are easily worn. As a conventional technique for preventing wear of a portion with a high wear load, Patent Document 1 discloses that an inner surface of a shroud and a blade surface that form a flow path of an impeller are coated with a hardened substance, and an impeller body and a front shroud are formed. A centrifugal impeller characterized by being joined is disclosed. Further, in Patent Document 2, the outer peripheral surface of the impeller side plate cylindrical portion, the inner peripheral surface of the diffuser facing the outer peripheral surface of the cylindrical portion, the outer peripheral surface of the impeller on the core plate side, and the outer peripheral surface are opposed. Each of the stage inner peripheral surfaces is coated with a film containing carbide and metal, and the carbide forming the film contains at least one of WC and Cr ₃ O ₂ , and the metal forming the film is Ni, Cr A multi-stage centrifugal pump characterized by including at least one of the above is disclosed.

JP 59-068599 A Japanese Patent No. 3573590

  However, the melt obtained from the chlorine leaching residue is at a high temperature, and the chlorine leaching residue includes dissolved chlorine that is an oxidizing substance and hydrochloric acid that is a corrosive substance. For this reason, there is a tendency that the wear of the components in the wetted part such as the impeller and casing of the pump is accelerated over the entire wetted part due to simultaneous progress of high temperature embrittlement, oxidation, and acid corrosion. As in Patent Document 1 and Patent Document 2, only by partially covering the wear-resistant material, an impeller of a pump for feeding a high-temperature melt containing a solid metal sulfide, oxide, oxidizing substance, or the like It was not sufficient to suppress the wear of components in the wetted part such as the casing. In addition, in order to operate the vertical subsidence centrifugal pump for a long time, operation management and maintenance management must be appropriately performed according to the progress of wear of the components in the wetted part of the vertical subsidence centrifugal pump. There is.

  The present invention has been made in view of the above problems, and excellent components in a wetted part even under the flow conditions of a high-temperature melt containing a solid metal sulfide, oxide, oxidizing substance, etc. New and improved management method for vertical subsidence type centrifugal pump and vertical type subsidence type centrifugal pump capable of reliably performing operation management and maintenance management of vertical type subsidence type centrifugal pump ensuring high wear resistance The purpose is to provide a management system.

  One aspect of the present invention is a management of a vertical subsidence type centrifugal pump that feeds a leaching residue mainly composed of sulfur from which metal sulfide has been leached to chlorine to a batch filtration device. A method of adjusting the frequency of an inverter of the electric motor so that a current value of the electric motor of the vertical subsidence centrifugal pump becomes a set value after installing the vertical subsidence centrifugal pump; An operation start step for starting the operation of the mold sinking centrifugal pump, and immediately after starting the operation of the vertical sinking centrifugal pump, the molten residue contained in the melt is filled in the batch filter and the A standard time setting step of measuring the liquid passing time until the liquid pressure on the input side of the batch filter rises to the set value, and setting the measured time as the standard time, and the filtration operation of the batch filter Every time A measuring step of measuring the liquid passing time of the liquid filtration device, a determining step of comparing the liquid passing time and the standard time, and when the liquid passing time is determined to be longer than the standard time, And an adjustment step of adjusting the liquid passing time to be the same as the standard time by increasing the frequency of the inverter.

  According to one aspect of the present invention, proper operation management of the pump can be performed according to the degree of wear of the impeller and the casing.

  At this time, in one aspect of the present invention, the set value of the current value of the electric motor in the operation start process may be 75% of the rated current.

  In this way, the frequency of the inverter can be adjusted with a margin so that the frequency of the inverter of the motor can be increased step by step, so that appropriate operation management of the pump can be performed according to the degree of wear of the impeller and casing. It becomes like this.

  Further, in one aspect of the present invention, the saddle-type subsidence type is used when the liquid passing time is determined to be longer than the standard time even when the frequency of the inverter of the electric motor is increased to 108% in the adjustment step. It is good also as including the pump exchange process of replacing | exchanging a vortex pump with the serviced or new vertical saddle-type vortex pump.

  If it does in this way, according to the wear condition of an impeller or a casing, pump exchange can be performed at a suitable timing.

  Further, in one aspect of the present invention, in the above aspect, the saddle type swirl pump is composed of an impeller composed of a gray cast iron material containing nickel and chromium, and the impeller composed of the gray cast iron material. A re-spraying step of re-spraying the lining material on the entire outer surface of the impeller and the entire inner surface of the casing of the vertical sinking centrifugal pump removed in the pump replacement step. It may be included.

  If it does in this way, according to the wear condition of an impeller or a casing, it can repair by respraying with respect to the pump with which the lining material after use which performed pump exchange at the right timing was thinned.

  Further, in one aspect of the present invention, after the re-spraying step, a vertical saddle-type swirl pump is prepared using an impeller and a casing on which the lining material is re-sprayed, and the pump replacement step is already maintained. It is good also as using as a saddle type subsidence type centrifugal pump.

  In this way, depending on the wear of the impeller and casing, replace the pump that has been repaired by respraying and repairing the pump whose lining material has been thinned after the pump replacement at the appropriate timing. As a result, the equipment utilization rate can be improved and maintenance costs can be reduced.

  Moreover, in one aspect of the present invention, in the re-spraying step, tungsten carbide is re-sprayed as the lining material over the entire outer surface of the impeller so that the thickness thereof is 100 μm or more and 400 μm or less, and the entire inner surface of the casing is subjected to the above-described re-spraying process. It is good also as respraying the self-fluxing thermal spraying alloy material as a lining material so that the thickness may be set to 1 mm or more and 3 mm or less.

  In this way, when the impeller and casing of the pump with excellent wear resistance are worn, the impeller and casing can be used repeatedly by performing appropriate repairs, thus reducing the cost of repairing the pump. it can.

  Another aspect of the present invention is a vertical subsidence type vortex for feeding a leaching residue mainly composed of sulfur from which metal sulfide has been leached to chlorine to a batch filtration device. A pump management system comprising: an adjustment unit having a function of adjusting an inverter frequency of an electric motor of the saddle-type sinking swirl pump; and immediately after the start of operation of the saddle-type sinking swirl pump, Measure the flow time until the molten residue contained is filled in the batch filter and the liquid pressure on the input side of the batch filter rises to the set value, and the measured time is taken as the standard time. A setting unit having a function of setting, a measuring unit having a function of measuring a liquid passing time of the batch filtration device for each filtration operation of the batch filtration device, and a magnitude relationship between the liquid passing time and the standard time Has a function to determine A determination unit, and when the determination unit determines that the liquid passing time is longer than the standard time, the adjustment unit increases the frequency of the inverter of the electric motor to increase the liquid passing time. It adjusts so that it may become the same as the said standard time.

  According to the other aspect of the present invention, appropriate operation management and maintenance management of the pump can be performed according to the wear condition of the impeller and the casing.

  As described above, according to the present invention, under the condition of flowing a high-temperature melt containing a solid metal sulfide, oxide, oxidizing substance, etc., the pump Appropriate operation management and maintenance management can be performed.

It is a schematic block diagram of the saddle type subsidence spiral pump applied with the management method of the saddle type subsidence spiral pump which concerns on one Embodiment of this invention. It is a principal part enlarged view of the saddle-type subsidence spiral pump applied with the management method of the saddle-type subsidence spiral pump which concerns on one Embodiment of this invention. (A) is a plan view of an impeller provided in a vertical sinking centrifugal pump applied in the management method of a vertical sinking centrifugal pump according to an embodiment of the present invention, (B) is a sectional view of the impeller, (C) is a bottom view of the impeller. It is an equipment block diagram in the melting process of a chlorine leaching residue to which a management system for a vertical sinking type centrifugal pump according to an embodiment of the present invention is applied. The graph which shows the relationship between the frequency of the inverter of the motor of a saddle-type subsidence-type centrifugal pump in the Example of the management method of the vertical-type subsidence-type centrifugal pump which concerns on one Embodiment of this invention, and the liquid flow time of a batch type leaf-type filter It is. The graph which shows the relationship between the frequency of the inverter of the electric motor of a vertical type subsidence type centrifugal pump, and the flow time of a batch type leaf type filter in the comparative example of the management method of the vertical type subsidence type centrifugal pump which concerns on one Embodiment of this invention It is.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.

  A management method for a vertical sinking type centrifugal pump according to an embodiment of the present invention is a batch filtration device for a leaching residue mainly composed of sulfur from which metal sulfide is leached with chlorine and having a temperature of 110 ° C. to 150 ° C. It is applied to the operation management and maintenance management of the vertical subsidence type centrifugal pump. Specifically, in the melting process of chlorine leaching residue when recovering sulfur from the chlorine leaching residue of sulfides containing nickel and cobalt in nickel smelting, depending on the impeller of the pump and the wear condition of the casing, Used for proper operation management and maintenance management.

  Chlorine leaching process in which nickel and cobalt-containing sulfides are leached using the oxidizing action of chlorine gas in nickel smelting, and the leached nickel ions and cobalt ions are produced as electrolytic nickel and electrolytic cobalt by electrowinning. Has been put to practical use. In this chlorine leaching process, a leaching residue, that is, a chlorine leaching residue containing sulfides and oxides containing sulfur as a main component and a trace amount of undissolved metal is produced.

  The chlorine leaching residue contains 80 to 87% by weight of sulfur, 2 to 5% by weight of iron, and 4 to 5% by weight of nickel. The chlorine leaching residue obtained there is separated into a liquid phase and a solid by a centrifuge, and the solid is put into a melting tank. By heating the solid put into the melting tank to 110 ° C. or more exceeding the melting point of sulfur, sulfur contained in the chlorine leaching residue becomes a liquid (melt) and stays in the melting tank. The melt in the melting tank is sent to the filtration device by a vertical sinking type centrifugal pump. Then, the melt of the chlorine leaching residue is filtered by a filtration device, so that the solid metal sulfide and oxide are separated from the molten sulfur, and the product sulfur is recovered from the chlorine leaching residue.

  The liquid temperature of the melt obtained from the chlorine leaching residue is 110 to 150 ° C., the specific gravity is 1.5 to 2.0, and the viscosity is 60 to 100 cP (1 cP = 1 mPa · s). Thus, the melt is at a high temperature, and the chlorine leaching residue includes dissolved chlorine which is an oxidizing substance and hydrochloric acid which is a corrosive substance. From this, the wear of the components of the wetted parts such as the impeller and casing of the pump that sends the melt obtained from the chlorine leaching residue to the filtration device is promoted by progressing simultaneously with high temperature embrittlement, oxidation, and acid corrosion. It is necessary to suppress this phenomenon.

  First, an outline of a saddle-type subsidence centrifugal pump applied in a management method of a saddle-type subsidence centrifugal pump according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a vertical sinking centrifugal pump applied in the vertical sinking centrifugal pump management method according to an embodiment of the present invention.

  As shown in FIG. 1, the saddle type centrifugal pump 100 according to an embodiment of the present invention is provided with an impeller 110 on the tip side of a rotating shaft 106 that is rotationally driven by a motor 102 that is a driving source. Is accommodated in the casing 112. The base end side of the rotating shaft 106 is supported by a bearing 104, the rotating shaft 106 is accommodated in a substantially cylindrical frame 108, and a casing 112 is attached to the distal end side of the frame 108 with a connecting member such as a bolt or a nut. It has been.

  On the bottom surface side of the casing 112, a pumping pipe 114 provided with a suction port 116 for sucking fluid at the tip end side is attached with a connecting member such as a bolt or a nut. Further, a discharge port 118 for discharging the fluid sucked from the suction port 116 is provided on the side surface side of the casing 112, and the discharge port 118 is a transfer connected by a substantially L-shaped connecting pipe 120. The tube 122 is connected to the filtration device 30 (see FIG. 4).

  By adopting such a configuration for the saddle-type sinking centrifugal pump 100 according to an embodiment of the present invention, the impeller 110 attached to the front end side of the rotating shaft 106 is driven to rotate by the motor 102, and the pumped pipe 114 The fluid sucked from the suction port 116 is discharged to the discharge port 118. Then, the fluid discharged from the discharge port 118 is sent to the filtration device 30 via the connection pipe 120 and the transfer pipe 122.

  When fluid is fed by the vertical sink pump 100, the life of the pumping pipe 114, the impeller 110, the casing 112, the connecting pipe 120, the transfer pipe 122, etc. is shortened due to wear caused by the fluid flow. The In particular, when a melt of 110 ° C. or more and 150 ° C. or less of a leaching residue mainly composed of sulfur from which metal sulfide is leached as a fluid is fed as a fluid, the liquid contact such as the impeller 110 or casing 112 of the pump body 111 The wear of the component parts tends to be promoted over the entire surface of the wetted part by simultaneous progress of high temperature embrittlement, oxidation and acid corrosion.

  Therefore, as a result of the study, after the impeller and the casing 112 are made of a gray cast iron material containing nickel and chromium, tungsten carbide is sprayed on the entire outer surface of the impeller 110 to coat with the tungsten carbide, and the casing 112 It was found that the wear of the pump impeller 110 and the casing 112 can be prevented by spraying a self-fluxing spraying alloy material classified into JIS symbol MSFNi4 on the entire inner surface and coating with the self-fluxing spraying alloy material. .

  In this embodiment, in order to send a wearable slurry containing dissolved chlorine or the like, tungsten carbide is applied to the entire outer surface of the impeller 110 in the pump body 111 immersed in the slurry, that is, the impeller 110 and the casing 112. Thermal spraying is applied, and the entire inner surface of the casing is coated by spraying a self-fluxing spraying alloy material classified as MSFNi4 by the JIS symbol.

  This reduces the number of pump stops due to wear of components in the wetted parts, even when an abrasive high-temperature melt slurry is fed in an environment subject to corrosion by corrosive substances, etc. The maintenance frequency will be reduced. For this reason, an equipment operation rate improves and it becomes possible to operate the vertical sinking type centrifugal pump 100 efficiently and at low cost.

  Next, the structure of the pump main body in the saddle type swirl pump according to the embodiment of the present invention will be described with reference to the drawings. FIG. 2 is an enlarged view of a main part of the vertical sinking centrifugal pump applied in the management method of the vertical sinking centrifugal pump according to the embodiment of the present invention, and is an enlarged view of part A shown in FIG. . FIG. 3A is a plan view of an impeller provided in a saddle-type sinking centrifugal pump applied in the management method of the saddle-type sinking centrifugal pump according to one embodiment of the present invention, and FIG. A sectional view of the impeller, FIG. 3C, is a bottom view of the impeller.

  An impeller 110 is attached to the front end side of the rotation shaft 106 so as to be supported by the shaft, and the front end of the rotation shaft 106 is fastened by a stopper 113. The impeller 110 is accommodated in the casing 112. As shown in FIG. 2, the casing 112 includes a top casing 112 a that covers the upper surface side of the impeller 110 and a bottom casing 112 b that covers the lower surface side of the impeller 110 and serves as a suction cover. The top part 112a1 of the top part side casing 112a is connected with the frame 108, and the bottom part 112b2 of the bottom part side casing 112b is connected with the pumping pipe.

  On the upper surface side in the axial direction of the impeller 110, a shaft sealing portion 109 is provided between the inner wall portion 112 a 3 of the top casing 112 a and the rotation shaft 106 so as to surround the rotation shaft 106. A suction port 112b3 provided at the center of the bottom casing 112b is disposed on the lower surface side of the impeller 110 in the axial direction, and a discharge port 118 is provided on the side of the top casing 112a in the radial direction of the impeller 10. The fluid is sucked from the suction port 112b3 by the rotation of the impeller 110, and the fluid is discharged from the discharge port 118.

  As shown in FIGS. 3B and 3C, the impeller 110 is provided on a disk-shaped main plate 110c and a surface of the main plate 110c facing the suction port 116 side, that is, a lower surface of the main plate 110c. A plurality of blades 110d. The plurality of blades 110d rotate to face the bottom surface portion 112b4 provided in the bottom side casing 112b serving as a suction cover. On the other hand, a back blade 110e for decompressing the shaft seal 109 is provided on the upper surface of the main plate 110c.

  In the present embodiment, as shown in FIG. 3C, the plurality of blades 110d are equally arranged at six locations with respect to the lower surface of the main plate 110c. Each blade 110d is formed in a spiral shape from the center of the main plate 110c in the circumferential direction, and is provided such that the distance in the facing direction from the adjacent blade 110d is increased. And it becomes the flow path of the fluid which transfers between adjacent blade | wings 110d.

  In the present embodiment, since a high-temperature melt is fed as a fluid, the impeller 110 may expand or expand due to heat. Therefore, the top casing is related to the clearance between the back blade 110e and the top surface 112a4 provided on the top casing 112a and the clearance between the blade 110d and the bottom surface 112b4 provided on the bottom casing 112b. Adjustment is possible using a bolt 115 and a nut 117 that connect the flange portion 112a2 provided below 112a and the flange portion 112b1 provided above the bottom casing 112b.

  Conventionally, the impeller material of the vertical subsidence type centrifugal pump used for pumping the molten material of chlorine leaching residue to the filtration device contains 27% by weight of Cr, 5% by weight of Ni and 2% by weight of Mo. However, a duplex stainless cast steel (trade name: Pyromet 26) composed of 80% by weight of ferrite and 20% by weight of austenite was used. However, the impeller made of duplex stainless steel has been in a situation where, after about two weeks from the start of use, the liquid cannot be fed due to wear and has to be replaced with a new one.

  Therefore, in the present embodiment, the material of the impeller 110 of the saddle type swirl pump 100 is changed to one in which nickel and chromium are added to gray cast iron (JIS standard: FC250) to improve wear resistance, and The tungsten carbide was sprayed on the entire outer surface of the impeller 110. Specifically, the outer surfaces of the upper convex portion 110a, the lower convex portion 110b, the main plate 110c, the blade 110d, and the back blade 110e of the impeller 110 are entirely sprayed with tungsten carbide for coating.

  Thus, as a result of changing the material of the impeller 110 and spraying and coating the entire outer surface with tungsten carbide, damage to the sprayed coating of tungsten carbide is recognized in about 2 to 3 months after the start of use, It can be used repeatedly by re-spraying tungsten carbide, and the life can be greatly extended.

  In general, tungsten carbide is a hard substance having a Vickers hardness of 1100 Hv, and is chemically inert, so it is a relatively high-temperature melt slurry containing a wearable solid, and has an oxidizing property. It is considered that excellent wear resistance is exhibited even under severe use conditions such as handling a melt slurry containing dissolved chlorine as a substance and hydrochloric acid as a corrosive substance.

  In this embodiment, in order to improve the wear resistance, the nickel content of the gray cast iron material is 1% by weight to 10% by weight, and the chromium content is 1% by weight to 10% by weight. . The thickness of tungsten carbide sprayed on the entire outer surface of the impeller is preferably 100 μm or more and 400 μm or less. If the thickness of the tungsten carbide is less than 100 μm, the substrate may be worn, and if it exceeds 400 μm, thermal spraying is difficult and the processing cost increases.

  Furthermore, in this embodiment, when the thickness of the tungsten carbide sprayed on the entire outer surface of the impeller 110 is worn down to less than 100 μm, it is preferable to repeatedly use the impeller 110 by respraying the tungsten carbide. That is, when the thickness of the tungsten carbide sprayed on the entire outer surface of the impeller 110 by using the impeller 110 is worn down to less than 100 μm, the impeller can be reused by respraying the tungsten carbide, so that the vertical sink type Repair the centrifugal pump 100.

  On the other hand, duplex stainless steel casting has been conventionally used as the material of the casing of the vertical sink pump. However, the casing made of duplex stainless steel has been in a situation in which pitting corrosion occurs due to wear and becomes unusable after about one month from the start of use, and it must be replaced with a new one.

  Therefore, in the present embodiment, the material of the casing 112 of the vertical sink pump 100 is changed to gray cast iron (JIS standard: FC250) to which nickel and chromium are added to improve wear resistance. A self-fluxing spraying alloy material (trade name: Surferloy S-6M) classified as MSFNi4 by the JIS symbol was sprayed on the entire inner surface of 112.

  As a result, as with the impeller 110, damage to the spray coating of the self-fluxing thermal spraying alloy material was recognized about 2-3 months after the start of use, but it was repeatedly used by re-spraying the self-fluxing thermal spraying alloy material. It was possible to extend the lifespan. In particular, the self-fluxing spray-welded alloy material classified as MSFNi4 by the JIS symbol is excellent in corrosion resistance and wear resistance because of its high nickel content.

  Further, the casing 112 is not in a situation where the wear load of a specific part is high as in the impeller 110, and in the case of the casing 112, the wear progresses uniformly over the entire inner surface. For this reason, in this embodiment, the self-fluxing thermal spraying alloy material classified into MSFNi4 by a JIS symbol was selected as a material which can take thermal spraying thickness larger than a tungsten carbide. Then, a self-fluxing spraying alloy material classified as MSFNi4 by the JIS symbol is sprayed and coated on the entire inner surface of the casing 112. Note that the entire inner surface of the casing 112 referred to herein refers to the inner wall 112a3 and the top surface 112a4 of the top casing 112a, and the bottom 112b4 and the suction port (inner wall) 112b3 of the bottom casing 112b.

  The nickel content of the gray cast iron material constituting the casing 112 is 1% by weight to 10% by weight and the chromium content is 1% by weight to 10% by weight in order to improve wear resistance. Moreover, the thickness of the self-fluxing spraying alloy material sprayed on the entire inner surface of the casing is set to 1 mm or more and 3 mm or less.

  When the thickness of the self-fluxing sprayed alloy material is less than 1 mm, the life of the casing is shortened. When the thickness exceeds 3 mm, the clearance with the impeller becomes narrower when the finished product is subjected to thermal spraying, making it impossible to implement. . In order to avoid this, it is necessary to make the casing as a custom-made product in advance, and it takes time and cost, so such a numerical range is set.

  As mentioned above, it is a relatively high-temperature melt slurry containing a wearable solid, and it also handles a melt slurry containing dissolved chlorine as an oxidizing substance and hydrochloric acid as a corrosive substance. The wear resistance of the impeller and the casing can be greatly improved by using the vertical sinking type centrifugal pump 100 of the present embodiment as the centrifugal pump. Specifically, in the past, the device life, which was about 2 weeks for the impeller and about 1 month for the casing, could be extended significantly to about 2 to 3 months for both the impeller and the casing. As a result, the equipment utilization rate was improved and the repair cost of the equipment could be greatly reduced.

  Next, the detail of the management method of the saddle-type subsidence type centrifugal pump which concerns on one Embodiment of this invention is demonstrated. If the impeller of the vertical sink type centrifugal pump of the present embodiment, it is desirable to respray tungsten carbide when the thickness of the tungsten carbide wears to less than 100 μm, and if the casing of the vertical sink type centrifugal pump, When the thickness of the self-fluxing spray welding alloy material is worn down to less than 1 mm, it is desirable to re-spray the self-fluxing spraying alloy material. Moreover, in order to improve the equipment operation rate and reduce the maintenance cost, it is desirable that the equipment stop cycle for repairing and maintaining the pump be as long as possible.

  However, when wear progresses until there is no longer any thermally sprayed tungsten carbide layer or self-fluxing spray-welded alloy material layer, the fluid to be flowed is a relatively high-temperature melt slurry containing a wearable solid, and oxidation. Under severe conditions such as handling melt slurry containing dissolved chlorine and corrosive hydrochloric acid, the wear of the gray cast iron impeller and casing, which is the main body of the pump, is significantly accelerated. Resulting in. In this case, the gray cast iron impeller and the casing body must be replaced, and conversely, the equipment operation rate is reduced and the maintenance cost is increased.

  In the vertical sinking type centrifugal pump of this embodiment, since the pump body, that is, the impeller and the casing, are immersed in the liquid, the remaining thickness of the tungsten carbide layer and the self-fluxing sprayed alloy material layer can be confirmed. It is necessary to stop the pump in operation, pull up the pump, and disassemble the pump body. Moreover, it is difficult to carry out daily inspections of the pump body by visual inspection.

  If wear of the impeller and casing of the pump progresses, the liquid feed flow rate decreases. However, it is extremely difficult industrially to accurately measure the flow rate of the melt slurry, which is a special measurement object mainly composed of liquid sulfur in which a solid precipitates at a temperature lower than 110 ° C. is there. Thus, conventionally, there has been a problem regarding how to determine an appropriate re-spraying time for the wear-resistant layer applied to the impeller and casing of the pump.

  As a result of intensive studies in order to achieve the above-described object of the present invention, the present inventors have measured the liquid passing time of a batch type leaf-type filtration device used for discharging the molten residue, and the impeller of the pump We have found that it is possible to perform proper operation management and maintenance management of the pump according to the impeller and casing wear condition by using as an index to judge the degree of wear of the casing and casing, and further research was conducted based on such knowledge As a result, the present invention has been completed.

  The management method of a vertical sinking type centrifugal pump according to an embodiment of the present invention is performed by the procedure of an operation start process, a standard time setting process, a measurement process, a determination process, an adjustment process, a pump replacement process, and a respraying process. .

  The operation starting step starts the operation of the saddle-type sinking spiral pump while adjusting the frequency of the inverter of the motor of the saddle-type sinking spiral pump. In this embodiment, after installing a new or maintenance vertical saddle-type centrifugal pump, the vertical sinking is performed so that the current value of the electric motor of the vertical sink-type centrifugal pump is 75% of the rated current at the set value. Adjust the frequency of the inverter of the motor of the centrifugal pump and start operation.

  Thus, in the operation start process, in order to increase the frequency of the inverter of the motor step by step, the current value of the motor of the saddle type swirl pump is 75% of the rated current and the normal value of the inverter frequency. The frequency of the inverter is adjusted with a margin so as to be a slightly smaller value. As a result, appropriate operation management of the pump can be performed according to the degree of wear of the impeller and the casing.

  In the standard time setting step, immediately after the operation of the saddle-type sinking centrifugal pump is started, the standard time of operation of the saddle-type sinking centrifugal pump is set. In this embodiment, immediately after the operation of the vertical sinking type centrifugal pump is started, the flow time of the batch type leaf type filtration device, that is, the molten residue contained in the melt is put into the batch type leaf type filtration device. The time until the fluid pressure at the inlet of the batch-type leaf type filtration device rises to the set value is measured, and the measured time is set as the standard time.

  A measurement process measures the liquid passing time of the said batch type filtration apparatus for every filtration operation of a batch type filtration apparatus. In the present embodiment, since a batch-type leaf-type filtration device is used as the filtration device, the liquid passing time measured by the batch-type filtration device is used as a management index for the operation of the pump.

  In the determination step, the passage time of the batch filtration device is compared with the standard time set in the standard time setting step, and the magnitude relationship between the passage time and the standard time is determined. In the adjustment step, when it is determined in the determination step that the liquid passing time is longer than the standard time, the frequency of the inverter of the electric motor is increased and the liquid passing time is adjusted to be the same as the standard time.

  Thus, in this embodiment, for each batch-type filtration operation, the liquid passing time of the leaf type filtration device is measured, and when the liquid passing time becomes longer than the standard time, the frequency of the inverter of the electric motor is increased, Adjust the flow time so that it is the same value as the standard time.

  As the pump wears, the gap between the impeller and the casing becomes larger, so that the flow rate of the pump decreases and the liquid passing time becomes longer. For this reason, in this embodiment, by increasing the inverter frequency of the pump motor and increasing the number of rotations of the pump, a decrease in the pumping flow rate is prevented, and the liquid passing time is made closer to the standard time. It is adjusted.

  Thus, in the management method of the present embodiment, through the operation start process, the standard time setting process, the measurement process, the determination process, and the adjustment process, by determining the standard time and managing the operation as a management index, Appropriate operation can be performed according to the progress of wear of the wetted parts such as the impeller and the casing.

  The pump replacement process compares the flow time of the batch filter when the frequency of the inverter of the motor is increased to 108% in the adjustment process and the standard time set in the standard time setting process. And the standard time.

  In the pump replacement process, even if the frequency of the inverter of the motor is increased to 108%, if it is determined that the liquid passing time is longer than the standard time, the pump is replaced. In this embodiment, even if the frequency of the inverter of the electric motor is increased to 108%, if it is determined that the liquid passing time is longer than the standard time, it is determined that the impeller and casing of the vertical sink pump are worn out. Therefore, the worn vertical sink pump is replaced with a new or serviced vertical pump. As described above, in this embodiment, the pump is replaced at an appropriate timing in accordance with the wear state of the impeller and the casing.

  In the re-spraying process, the lining material is re-sprayed on the entire outer surface of the impeller and the entire inner surface of the casing of the saddle type swirl pump where the impeller and casing removed in the pump replacement process are worn. In this embodiment, the lining material is re-sprayed on the impeller and casing of the vertical saddle-type swirl pump that has been worn, so that a vertical saddle-type swirl pump is provided. Then, once the lining material was re-sprayed on the impeller and casing of the vertical sink type centrifugal pump that was worn in the re-spraying process, and the maintenance was completed, in the next pump replacement process, the maintained vertical sink type centrifugal pump was worn. Replace with vertical sink pump.

  In the re-spraying step of the present embodiment, tungsten carbide is re-sprayed as a lining material over the entire outer surface of the impeller so that the thickness thereof is 100 μm or more and 400 μm or less, and self-fluxing spraying alloy material as a lining material over the entire inner surface of the casing. Is sprayed again so that the thickness becomes 1 mm or more and 3 mm or less.

  In this way, when the impeller or casing of the pump that ensures excellent wear resistance is worn, the impeller and casing can be used repeatedly by performing appropriate repairs, so that the cost of repairing the pump can be reduced. It becomes like this. In other words, depending on the wear of the impeller and casing, it is possible to repair the pump by thinning the lining material that has been replaced at the right time by respraying at the right time. Increase the rate and reduce maintenance costs.

  Further, in the present embodiment, the fluid that is fed by the vertical subsidence centrifugal pump is a melt of 110 ° C. or more and 150 ° C. or less of a leaching residue mainly composed of sulfur from which metal sulfide is leached with chlorine. That is, the fluid to be pumped is a relatively high-temperature melt slurry containing abrasive solids, and a melt slurry containing dissolved chlorine as an oxidizing substance and hydrochloric acid as a corrosive substance. is there.

  In contrast to the saddle type centrifugal pump used in such a state that it is extremely difficult to measure the liquid feed flow rate under severe use conditions such as handling such a melt slurry, in this embodiment, the pump is stopped. Without interrupting the operation, it is possible to grasp the wear state of the pump impeller and the casing by the liquid passing time of the batch filter and the frequency of the inverter of the electric motor that drives the pump. For this reason, the pump can be replaced at an appropriate time, and the respraying repair of the wear resistant material of the impeller of the pump and the casing can be performed. Therefore, it is possible to improve the equipment operation rate and reduce the maintenance cost by performing appropriate operation management and maintenance management of the vertical sinking type centrifugal pump.

  Next, a management system operated by a management method for a vertical sinking centrifugal pump according to an embodiment of the present invention will be described with reference to the drawings. FIG. 4 is an equipment configuration diagram in a chlorine leaching residue melting step to which the vertical sinking type centrifugal pump management system according to one embodiment of the present invention is applied.

  The management system 1 operated by the management method of the vertical subsidence centrifugal pump 100 according to the embodiment of the present invention recovers sulfur from a chlorine leaching residue of sulfides containing nickel and cobalt in nickel smelting. In a melting step of a chlorine leaching residue, a vertical subsidence type centrifugal pump for feeding a leaching residue of 110 ° C. or more and 150 ° C. or less of a leaching residue mainly composed of sulfur from which metal sulfide has been leached to a batch filtration device 30 It is applied when 100 proper operation management and maintenance management are performed.

  As described above, the chlorine leaching residue contains 80 to 87% by weight of sulfur, 2 to 5% by weight of iron, and 4 to 5% by weight of nickel. The obtained chlorine leaching residue is separated into a liquid phase and a solid by the centrifuge 10, and the solid is put into the melting tank 20. By heating the solid put into the melting tank 20 to 110 ° C. or more exceeding the melting point of sulfur, sulfur contained in the chlorine leaching residue becomes a liquid (melt) 22 and stays in the melting tank 20. .

  The melt 22 in the melting tank 20 is sent to the filtration device 30 by the vertical sinking centrifugal pump 100 according to one embodiment of the present invention. Then, the melt of the chlorine leaching residue is filtered by the filtration device 30, whereby the solid metal sulfide and the oxide are separated from the molten sulfur, and the product sulfur is recovered from the chlorine leaching residue.

  The melt is at a high temperature, and the chlorine leaching residue that is the melt includes dissolved chlorine that is an oxidizing substance and hydrochloric acid that is a corrosive substance. For this reason, the wear of the wetted parts such as the impeller and casing of the pump for feeding the melt obtained from the chlorine leaching residue to the filtration device 30 is promoted by progressing simultaneously with high temperature embrittlement, oxidation and acid corrosion. It is necessary to suppress this phenomenon.

  In the management system 1 operated by the management method of the saddle type centrifugal pump 100 according to the embodiment of the present invention, appropriate operation management and maintenance of the pump according to the wear condition of the wetted parts such as the impeller and the casing. In order to perform management, the control unit 40 that controls the operation of the saddle type swirl pump 102 and the filtering device 30 includes an adjustment unit 42, a setting unit 44, a measurement unit 46, and a determination unit 48.

  The adjustment unit 42 has a function of adjusting the frequency of the inverter of the electric motor 102 of the saddle type sinking centrifugal pump 100. In the present embodiment, the adjustment unit 42 sets the frequency of the inverter of the electric motor 102 so that the current value of the electric motor 102 becomes 75% of the rated current when the saddle type swirl pump 100 is installed and the operation is started. Adjust.

  The setting unit 44 has a function of setting a standard time after starting the operation of the vertical sinking centrifugal pump 100. In the present embodiment, since the filtering device 30 is a leaf type batch filter, the setting unit 44 causes the molten residue of the melt to be contained in the leaf type batch filter after the start of the operation of the vertical sinking centrifugal pump 100. The time until the fluid pressure on the input side of the leaf type batch filter rises to the set value is measured, and the measured time is set as the standard time. In addition, the said setting value is determined by the capacity | capacitance of a pump, and the capacity | capacitance of a filter, such as a pump head, discharge amount, and filter cake volume, for example.

  The measuring unit 46 has a function of measuring the liquid passing time of the filtration device 30 for each filtration operation of the filtration device 30. In this embodiment, since a leaf-type batch filtration device is used as the filtration device 30, proper operation management of the pump is performed using the measured liquid passing time according to the wear condition of the impeller and the casing. It has been realized.

  The determination unit 48 has a function of determining the magnitude relationship between the liquid passing time and the standard time. In the present embodiment, when the determination unit 48 determines that the liquid passing time is longer than the standard time, the adjustment unit 42 increases the frequency of the inverter of the electric motor 102 so that the liquid passing time becomes the same as the standard time. It is characterized by adjusting as follows. As described above, in this embodiment, by setting the standard time and using it as an operation management index, it is possible to perform appropriate operation management and maintenance management of the pump in accordance with the wear state of the impeller and the casing.

  Next, the management method of the saddle type swirl pump according to an embodiment of the present invention will be described in detail with reference to examples. In addition, this invention is not limited to the said Example.

(Example)
In the step of recovering sulfur from the chlorine leaching residue of sulfides containing nickel and cobalt in nickel smelting, as a melting tank pump for sending the melt from the melting tank to the filtration device, the soot according to one embodiment of the present invention The operation was carried out using a mold sinking centrifugal pump.

  The chlorine leaching residue was heated by passing 0.6 MPa steam through a serpentine tube to obtain a 130 ° C. melt slurry. Moreover, the specific gravity of the melt slurry was 1.5 to 2.0, and the viscosity was 60 to 100 cP. Furthermore, the chemical composition of the molten chlorine leaching residue was 80 to 87% by weight of sulfur, 2 to 5% by weight of iron, and 4 to 5% by weight of nickel. In addition, about the chemical composition, about sulfur, it calculated | required by the subtraction method (100 weight%-(organic substance + ash content) weight%). Moreover, about iron and nickel, it measured by ICP method.

  The vertical sink pump had a discharge rate of 150 L / min and a total lift of 20 m in the melt. In addition, as a material of the vertical sink pump, the impeller is made of gray cast iron with a nickel content of 1% by weight to 10% by weight and a chromium content of 1% by weight to 10% by weight. Then, the one in which tungsten carbide was thermally sprayed to a thickness of about 300 μm on the entire outer surface of the impeller was used.

  The casing is made of gray cast iron with a nickel content of 1% by weight to 10% by weight and a chromium content of 1% by weight to 10% by weight. A self-fluxing sprayed alloy material (trade name: Surferloy S-6M) classified as MSFNi4 was sprayed with a thickness of about 2 mm. Under the above conditions, the operation of feeding the molten leaching residue from the melting tank to the filtration device was continued for 47 days.

  FIG. 5 is a graph showing changes in the frequency of the inverter of the electric motor of the saddle type swirl pump and the liquid passing time of the batch type leaf filter according to the example. In addition, the horizontal axis of FIG. 5 has shown the frequency | count of operation of a batch type leaf type filter. In the example, since the liquid viscosity was high immediately after the start of operation, the frequency of the inverter of the motor was set higher. Thereafter, at the stage where the batch operation was performed 242 times, the pump was removed and the internal inspection was performed. As a result of visual inspection, no wear was observed on the impeller or casing. Thereafter, since the number of batch operations was about 450, even when the frequency of the inverter of the electric motor was 63 Hz (105%), the liquid passing time exceeded the standard time, so the pump was replaced. As a result of the inspection, wear was observed on the impeller and casing that had been subjected to wear-resistant spraying, but the wear-resistant sprayed layer remained and was reusable by re-spraying.

(Comparative example)
The operation of feeding the molten leaching residue of chlorine from the melting tank to the filtration apparatus was continued for 75 days using the vertical sink pump of the same type as that of the example in the same melting tank pump as in the example. The composition of the chlorine leaching residue and the melting condition of the chlorine leaching residue are the same as in the example. In the comparative example, except that the frequency of the inverter of the motor is increased to more than 108%, the operation management and maintenance of the pump are performed according to the same management method of the vertical subsidence centrifugal pump according to the embodiment of the present invention as in the example. Long-term operation was carried out while managing.

  FIG. 6 is a graph showing changes in the frequency of the inverter of the electric motor of the saddle type swirl type centrifugal pump according to the comparative example and the liquid passing time of the leaf type filter. Since the liquid viscosity was high immediately after the start of operation, the frequency of the inverter of the motor was set higher. Thereafter, as the number of batch operations increased, the wear of the liquid contact member progressed and the filling time for the filter became longer. Therefore, the frequency of the inverter of the electric motor was increased. When the batch operation was performed about 1000 times, the frequency of the inverter of the electric motor was increased to 65.5 Hz (109%). Immediately after raising the frequency of the inverter of the motor to 109%, the pump was poorly pumped frequently and was replaced. The number of batch operations at the time of replacement was 1026. When the removed pump was disassembled, the wear-resistant spray coating on the impeller and casing was gone, and the base metal part was thinned due to wear and corrosion, and repair by re-spraying was impossible. . From this, it was found that when the inverter frequency was used until it exceeded 108%, not only the wear-resistant sprayed coating but also the base material portion could not be reused due to wear and corrosion.

  From the results of the above examples and comparative examples, in the examples to which the management method of the saddle type swirl pump according to one embodiment of the present invention is applied, the liquid passing time of the filtration device and the inverter of the electric motor that drives the pump By grasping the wear state of the pump impeller and casing based on the frequency, it is possible to operate for a long time without impairing the function of the pump, and maintenance management to repair at a suitable timing can be performed. I understood. Further, it has been found that the upper limit value for increasing the inverter frequency of the electric motor is 108%.

  Although the embodiments and examples of the present invention have been described in detail as described above, it will be understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. It will be easy to understand. Therefore, all such modifications are included in the scope of the present invention.

  For example, a term described with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configuration and operation of the saddle-type sinking centrifugal pump are not limited to those described in the embodiments and examples of the present invention, and various modifications can be made.

1 management system for vertical sinking type centrifugal pump, 10 centrifuge, 20 melting tank, 22 melt, 30 batch filtration device, 40 control unit, 42 adjustment unit, 44 setting unit, 46 measuring unit, 48 determining unit, DESCRIPTION OF SYMBOLS 100 Vertical sinking type centrifugal pump, 102 Motor (electric motor), 104 Bearing, 106 Rotating shaft, 108 Frame, 110 Impeller, 111 Pump body, 112 Casing, 112a Top side casing, 112b Bottom side casing, 113 Stopper, 114 Pumping liquid Pipe, 116 Suction port, 118 Discharge port, 120 Connecting pipe, 122 Transfer pipe

Claims (7)

A management method for a vertical subsidence swirl pump in which a leaching residue mainly containing sulfur from which metal sulfide has been leached is flowed to a batch type filtration device at a temperature of 110 ° C. to 150 ° C.
After installing the saddle type swirl pump, the saddle type swirl pump is adjusted by adjusting the frequency of the inverter of the motor so that the current value of the motor of the saddle type swirl pump becomes a set value. An operation start process for starting the operation of
Immediately after starting the operation of the vertical sink pump, the molten residue contained in the melt is filled in the batch filter and the liquid pressure on the input side of the batch filter is increased to a set value. A standard time setting process for measuring the liquid passing time until the liquid is discharged and setting the measured time as a standard time;
A measuring step for measuring the flow time of the batch filtration device for each filtration operation of the batch filtration device;
A determination step of comparing the liquid passing time and the standard time;
An adjustment step in which, when it is determined that the liquid passing time is longer than the standard time, the frequency of the inverter of the electric motor is increased and the liquid passing time is adjusted to be the same as the standard time. A management method of a vertical subsidence type centrifugal pump.   The management method of the vertical subsidence type centrifugal pump according to claim 1, wherein a set value of the current value of the electric motor in the operation start step is 75% of a rated current.   Even if the frequency of the inverter of the electric motor is increased to 108% in the adjustment step, if it is determined that the liquid passing time is longer than the standard time, the saddle-type sinking swirl pump has been maintained or is new. The management method of the vertical subsidence type centrifugal pump according to claim 1, further comprising a pump exchanging step of exchanging with a type subsidence type centrifugal pump. The saddle type swirl pump includes an impeller made of gray cast iron containing nickel and chromium, and a casing made of the gray cast iron and containing the impeller.
The respraying step of respraying a lining material on the entire outer surface of the impeller and the entire inner surface of the casing of the saddle type swirl pump removed in the pump replacement step is further characterized by the above-mentioned. Management method for vertical type subsidence centrifugal pump.   After the re-spraying step, use the impeller and casing on which the lining material has been re-sprayed to prepare a vertical saddle-type centrifugal pump that has been maintained, and use it as a vertical saddle-type centrifugal pump that has been maintained in the pump replacement step. The management method of the saddle type subsidence type centrifugal pump according to claim 4.   In the re-spraying step, tungsten carbide as the lining material is re-sprayed over the entire outer surface of the impeller so that the thickness is 100 μm or more and 400 μm or less, and the self-fluxing spray welding alloy is used as the lining material over the entire inner surface of the casing. The method for managing a vertical subsidence centrifugal pump according to claim 4 or 5, wherein the material is re-sprayed so that the thickness thereof is 1 mm or more and 3 mm or less. A management system for a vertical subsidence swirl pump that feeds a melt of 110 ° C. or more and 150 ° C. or less of a leaching residue mainly composed of sulfur from which metal sulfide has been leached to a chlorine,
An adjusting unit having a function of adjusting the frequency of the inverter of the electric motor of the vertical sinking type centrifugal pump;
Immediately after starting the operation of the vertical sink pump, the molten residue contained in the melt is filled in the batch filter and the liquid pressure on the input side of the batch filter is increased to a set value. A setting unit that has a function of measuring the liquid passing time until it is performed and setting the measured time as a standard time;
A measuring unit having a function of measuring the flow time of the batch filtration device for each filtration operation of the batch filtration device;
A determination unit having a function of determining a magnitude relationship between the liquid passing time and the standard time,
When the determination unit determines that the liquid passing time is longer than the standard time, the adjusting unit increases the frequency of the inverter of the electric motor so that the liquid passing time becomes the same as the standard time. A vertical subsidence type centrifugal pump management system characterized by adjusting to