JPH0612160B2 - Method for pipe-transporting highly viscous materials by transport pump - Google Patents

Abstract

PURPOSE:To facilitate transportation of highly viscous material through a pipe by injecting a lubricant such as a polymeric lubricant on the inner face of a pipe wall a proper pressure. CONSTITUTION:A viscous material pushing hopper 2 is provided on a viscous material transporting pump 1, while a transportation pipe 3 extends from a discharge port of the pump 1 to the destination. Each lubricant injecting pipe 30 is inserted into one or several proper positions of the pipe line 3, the connecting port 38 of each lubricant injecting pipe 30 is connected to a lubricant injecting pump 16 by means of a conduit 15, and this pump 16 is further connected to a lubricant tank 17 containing water, oil, or polymeric lubricant. As a result, friction damage in the pipe can be decreased by reducing the friction resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a piston type, a plunger type, a diaphragm type for a highly viscous substance, for example, a sludge having a very low water content and a poor fluidity, and a substance such as discharged soil. Alternatively, it relates to a method for pumping by a positive displacement slurry pump such as a screw type.

[Conventional technology]

In order to pipe material on slurry with low water content or high viscosity and poor fluidity, reciprocating type transfer pump such as piston type, plunger type, diaphragm type or constant volume type such as screw type is used. Although a pump is used, in the case of a viscous substance with a very low water content and a very high viscosity, such as sewage sludge cake that has been press dehydrated to a water content of approximately 60% or less, even if the substance is a transport pump. Even if it is possible to inhale and discharge due to, the frictional resistance between the pipe and the transported object from the discharge side to the destination is extremely large, so the required power becomes large and long-distance transportation is technical,
It was impossible financially. Therefore, the water content or the viscosity is naturally limited due to the pipe transportation. For this reason, conventionally, the method of transporting a viscous substance having a very high viscosity has to be transported by a conveyor such as a belt cover.

[Problems to be Solved by the Invention]

An object of the present invention is to provide a method for pipe transport of a viscous substance, which enables pipe transport of even a viscous substance having a very low water content or a very high viscosity.

[Means for Solving the Problems]

In order to achieve the above object, according to the present invention, a lubricant injection pump of a lubricant injection pump is detected so that a pressure difference between two points of a pipeline downstream from each lubricant injection point is detected and the others are within a predetermined set value range. The discharge amount may be automatically controlled.

The reason why the pressure detecting portion of the highly viscous substance in the pipeline is provided downstream of the lubricant injecting portion in the present invention is as follows.
That is, when the transport pressure of the highly viscous substance is detected in the pipeline upstream of the lubricant injection point, the result of injecting the lubricant is unknown, and the pressure difference (Δp) is not always constant downstream of the lubricant injection point. Alternatively, since it cannot be assumed that a certain pressure range is obtained, the pressure of the highly viscous substance must be detected even in the downstream, and the total measurement distance becomes long. As a result, when priority is given to upstream or downstream, more stable pressure control can be achieved in the downstream side, and thus equipment can be made smaller. In pressure control, when the pressure difference is low, the amount of lubricant supplied to the pipeline is reduced, and when the pressure difference is high, the amount of lubricant is increased.

Further, when a reciprocating pump that intermittently discharges, such as a piston type or a plunger type, is used as the high viscous substance transportation pump, the piston of the transportation pump or the stroke position of the plunger or Detects pressure fluctuations in the transport pipe, and injects the lubricant intermittently into the pipeline from the lubricant injection pump or accumulator tank in synchronization with the pipe in the discharge stroke of the piston or the plunger or while the pressure inside the pipe is in a steady state. By doing so, the above object can be achieved.

〔Example〕

An apparatus for carrying out the method of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a pipeline equipped with a device for carrying out the method according to the invention for pipe-transporting highly viscous substances by means of transport pumps. Reference numeral 1 is a viscous substance transport pump, and 2 is a viscous substance pushing hopper for pushing the viscous substance into the pump for inhalation. As the viscous substance transport pump, a piston-type, a plunger-type or a diaphragm-type reciprocating pump or a positive displacement pump such as a screw-type pump is used. A transport pipe 3 extends from the viscous substance transport pump 1 to a destination, and a lubricant injection pipe and a lubricant pumping circuit are attached to portions A and B in the pipeline.

9 to 11 show an apparatus for carrying out the method according to the invention for pipe-transporting viscous substances by means of transport pumps.

FIG. 2 shows an apparatus 10 for carrying out the most basic lubricant injection method underlying the present invention. A viscous substance pushing hopper 2 is mounted on the viscous substance transport pump 1, and a transport pipe 3 extends from the discharge portion of the transport pump 1 to a destination. A lubricant injection pipe 30 is inserted and arranged at an appropriate one or several places in the pipe run 3, and a connection port 38 of the lubricant injection pipe is connected to a lubricant injection pump 16 by a conduit 15, and the lubricant injection pump further receives water or water. It is connected to a lubricant tank 17 for oil or polymer lubricant. Inside the lubricant tank 17, there is a stirrer 18 if necessary. Pressure gauges 13 and 14 are attached upstream and downstream of the lubricant injection pipe 30 of the pipeline 3, respectively. The lubricant injection pump 16 has a pressure accumulator tank 19 as shown by a dotted line.
Can also be connected.

Typical examples of the lubricant injection pipe are shown in FIGS. 3 to 8. Third
The lubricant injecting agent 30 shown in FIG. 4 and FIG. 4 is configured as a double pressure pipe composed of an outer pipe 31 and an inner diameter 32 having the same diameter as the pipe 3 of the transported object or a slightly larger diameter.
The annular space 33 between the inner pipe 32 and the inner pipe 32 has annular plates 34, 3 at both ends.
Closed by 5. The inner tube 32 is provided with a large number of pores 36 for injecting a lubricant. The pore 36 is the inner tube 32.
Although it may be opened at a right angle, it may be opened obliquely with respect to the traveling direction as shown in FIG. The outer pipe 31 has flanges 37, 37 'at both ends, and is connected to the viscous material pipe 3 by these flanges. The outer pipe 31 is further provided with a lubricant pressure source, for example, a connection port 38 connected to a pipe from a lubricant transport pump or a pressure accumulator tank, a pressure gauge 39, a drain drain 40, and a check valve 41.

In FIG. 6, a porous tube 5 is used instead of the inner tube with the fine holes.
Fig. 50 shows Example 50 of a lubricant injection tube using No. 2. Parts similar to those in FIGS. 3 and 4 are provided with a reference numeral plus 20. By using the porous tube 52, it is possible to evenly inject the lubricant into the transport material from the whole week surface.

7 and 8 show another example 70 of the lubricant injection tube. This example differs from the examples of FIGS. 3 and 4 in that the inner tube is formed as a tapered tube that tapers downstream and the end wall 75 thereof is appropriately arranged along the circumference of the inner tube 72. The number of pores 76 is perforated. A pipe 81 having the same diameter as the pipe 3 of the pipeline is further fixed to the end wall 75, and a flange 77 is fixed to the end thereof. Parts similar to those of FIGS. 3 and 4 are provided with the reference numeral plus 40. In this example, the lubricant is extruded from the hole of the end wall provided along the outer circumference of the inner pipe having a taper tapering toward the downstream side, and the conveyed product extruded from the tapered end of the inner pipe 72. There is an advantage that it can be injected into the outer peripheral surface without resistance.

Now, referring to FIG. 2, when the viscous substance such as sludge having a very low water content put into the hopper 2 is being conveyed by the transport pump 1 to the destination through the pipeline 3, the operation of the lubricant injection pump 16 is performed. Alternatively, when a lubricant such as water, oil, or a polymer lubricant is pumped from the lubricant tank 17 through the conduit 15 to the connection port 38 of the lubricant injection pipe 30 by the pressure accumulating tank 19, the lubricant is injected into the annular space 33 between the inner pipe and the outer pipe. From the pores 36 of the inner pipe, the inflow is uniformly contacted with the outer periphery of the viscous substance being conveyed in the inner pipe. This improves the lubricity between the viscous substance and the pipe 3 and significantly reduces the friction, making it very easy to transport in the pipeline. It is necessary to surely inject the lubricant into the lubricant injection pipe 30 at a pressure slightly higher than the pressure P ₀ indicated by the pressure gauge 13 immediately before the lubricant injection pipe 30.

Next, FIG. 9 shows an apparatus 110 for carrying out the lubricant injection method of the present invention. Parts similar to those of FIG. 2 are provided with a reference numeral plus 100. In this device, two points 114 and 1 in the pipeline downstream from the lubricant injection pipe 30 are used.
The pressure difference P ₁ -P ₂ between 20 is detected by the differential pressure detector 121, and the signal is compared and calculated by the comparison calculator 122 with a predetermined set value determined on the basis of a predetermined optimum injection amount, The resulting signal can control, for example, the variable speed motor 123 for driving the lubricant injection pump to adjust the lubricant injection amount to a predetermined value. This method is suitable when the amount of lubricant mixed in the conveyed product is preferably smaller in the next step. According to this method, the amount of the lubricant to be injected is controlled to the minimum necessary amount, so that the property of the transport substance is not changed, the equipment is small, and therefore, it is economical.

Further, in FIG. 9, it is also possible to use a normal constant speed drive motor without using the drive transmission motor 123 of the lubricant injection pump. In that case, the set value of the comparison calculator 122 is set to the upper limit and the lower limit, and the lubricant injection pump 11 is set so that the differential pressure P ₁ -P ₂ is stored between the upper limit and the lower limit of the set value.
It is also possible to control the amount of lubricant injection by controlling ON / OFF of the constant speed drive motor of No. 6.

Still in FIG. 10, an apparatus 210 for carrying out another method of the present invention is shown. In this device, a comparison calculator 222 connected to a differential pressure detector 221 downstream of the lubricant injection pipe 30 is
It differs from FIG. 9 in that it is connected to a solenoid valve 224 provided in a conduit 215 connecting the lubricant injection pump 216 and the lubricant injection pipe 30. In this device, the amount of lubricant injection can be controlled by turning on / off the solenoid valve 224 with a signal from the comparison calculator 222.

FIG. 11 shows an apparatus 310 for performing yet another method of the present invention. When a piston-type or plunger-type reciprocating pump is used as the viscous substance transport pump 1, the transport pump intermittently discharges the stroke end thereof as zero. That is, the flow velocity of the transported material in the pipe 3 of the pipeline changes at the time of switching strokes, and the pipe resistance also changes accordingly. Correspondingly, the pressure in the pipeline is also between the maximum and minimum values. Fluctuate. This device considers the fluctuation of the pressure and stops the injection of the lubricant to prevent the excess injection of the lubricant at the time when the flow velocity of the conveyed product in the pipeline where the pressure decreases becomes zero, and By injecting the lubricant when the object starts to move, the lubricant can be evenly injected around the pipe wall of the package.

In FIG. 11, a lubricant tank 317, a lubricant injection pump 316, and a lubricant injection circuit 315 connecting the lubricant injection pipe 30 are connected.
A bypass circuit 325 for returning to the lubricant tank is provided in the above, and a solenoid valve 326 is arranged in this bypass circuit. On the other hand, a detector 3 that detects the stroke end of the reciprocating transport pump 1
27 is provided in the transport pump 1, and the solenoid valves 324 and 326 are operated by the signal of the detector 327.

When the detector 327 is actuated to detect the stroke end of the transport pump 1, and thus when the stroke end is approached, the solenoid valve 324 in the lubricant inflow circuit 315 is closed to stop the injection of the lubricant into the pipeline 3. At the same time, the solenoid valve 326 of the Bi-Pow circuit 325 is opened to return the lubricant to the lubricant tank 317. Subsequently, when the piston of the transport pump 1 has passed the stroke end and the steady state of discharge has entered, the solenoid valve 324 is opened and at the same time the solenoid valve 326 is closed, and the injection of the lubricant into the pipeline 3 is started. In this case, the discharge amount of the lubricant injection pump is the differential pressure between any two points P ₁ and P ₂ of the pipeline downstream of the lubricant injection pipe 30 as in the case of FIGS. 9 and 10 of the previous embodiment. Can be detected to change the discharge amount of the lubricant injection pump 316.

When the viscous substance transport pump 1 shown in FIG. 11 is a piston-type or plunger-type reciprocating pump that is hydraulically driven, the transport is intermittent, so the lubricant is injected in synchronization with the transport cycle. There is a need to. As a method, it is possible to detect the switching of the drive hydraulic circuit (not shown) of the transport pump 1 at the stroke end and inject the lubricant only while the piston or the plunger is in the pushing stroke, or The pressure oil is branched from the drive hydraulic pressure switching circuit and guided to a hydraulic reciprocating lubricant injection pump (not shown). By injecting the lubricant with this lubricant injection pump, the lubricant is completely synchronized with the flow in the pipe. Can be injected.

Next, Table 1 shows the experimental results of the actual implementation of the method of the present invention.

In order to incinerate the sewage sludge cake by incineration, it was dehydrated by a press using coal slag as a dehydration aid, and this dehydrated sludge cake was pipe-transported by a piston type double cylinder type slurry pump through a pipeline of 200A. The values obtained by measuring the pressure loss per 1 m of horizontal pipe length are shown for the case where no lubricant is used, the case where water is used as a lubricant, and the case where oil is used as a lubricant. A comparison of the pressure loss values in the pipe without and with the lubricant shows that the inflow of the lubricant significantly reduces the pressure loss in the pipe.

〔The invention's effect〕

According to the method of the present invention, since the amount of the lubricant to be injected into the pipe is controlled to the minimum required amount, the property of the transported substance is not changed, the equipment is small, and therefore, it is economical. Particularly in the present invention, since the pressure detection point of the highly viscous substance of the pipeline is provided in the pipeline downstream from the lubricant injection point, more stable pressure control can be achieved as compared with the case where it is provided upstream as described above. it can.

Further, in the present invention, when a reciprocating type transport pump such as a piston type or a plunger type that discharges intermittently is used, the stroke position of the piston or the plunger of the transport pump or the pressure fluctuation in the transport pipe is detected. However, the lubricant is injected into the pipeline intermittently from the lubricant injection pump or accumulator tank in synchronization with the period when the piston or the plunger is in the discharge stroke or the period when the pipe pressure is in a steady state. When the flow rate of the highly viscous substance at which the pressure in the line decreases and the flow rate of the highly viscous substance is zero, the injection of the agent is stopped to prevent the lubricant from being excessively infused, and the lubricant is removed when the highly viscous substance starts to move. By injecting, the lubricant can be evenly injected around the tube wall of the highly viscous substance.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a pipeline equipped with an apparatus for carrying out the method of the present invention for pipe-transferring a viscous substance by a transfer pump, and FIG. 2 is the most basic on which the present invention is based. FIG. 3 is a schematic view showing an apparatus for carrying out a conventional lubricant injection method, FIG. 3 is a longitudinal sectional view of an example of a lubricant injection pipe, and FIG.
FIG. 5 is a cross-sectional view taken along line IV-IV in FIG.
The figure is a partial cross-sectional view showing an example of perforations formed obliquely on the inner wall of the lubricant injection pipe, FIG. 6 is a vertical cross-sectional view of another example of the lubricant injection pipe, and FIG. 7 is another example of the lubricant injection pipe. Fig. 8 is a longitudinal sectional view, Fig. 8 is a sectional view taken along line VIII-VIII in Fig. 7, Fig. 9 is a schematic view showing an example of an apparatus for carrying out the method of the present invention, and Fig. 10 is a book. FIG. 11 is a schematic view showing an example of an apparatus for carrying out another method of the invention, and FIG. 11 is a schematic view showing an example of an apparatus for carrying out another method of the present invention. 1 …… Transport pump 3 …… Vipline 30,50,70 …… Lubricant injection pipe 114,120; 214,220; 314,320 …… Downstream two points 116,216,316 …… Lubricant injection pump 117,217, 317 …… Lubricant tank 327 …… Transport pump stroke end detector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Mori Takashi Mori, Kanazawa, Ishikawa Prefecture, 284 Ha, Tobemachi, Kanazawa City West Cleaning Plant (72) Shinichi Miyamoto 284 Habe, Toriki, Kanazawa, Ishikawa Prefecture, West, Kanazawa (72) Inventor Shinichi Miyae 1-22-1 Teramachi, Kanazawa City, Ishikawa Prefecture (56) References JP-A-50-107520 (JP, A)

Claims (2)

[Claims] 1. A method for pipe-transporting a highly viscous substance by means of a transportation pump, which comprises water or oil or a high-pressure substance at an appropriate one or a plurality of places in the pipeline where the highly viscous substance is transported. In the method of injecting a lubricant such as a molecular lubricant at an appropriate pressure to reduce the frictional resistance between the package and the inner wall of the pipe to facilitate pipe transportation, two points of the pipeline downstream from each lubricant injection point A method of detecting a pressure difference between the two and automatically controlling the discharge amount of the lubricant injection pump so that the value falls within a predetermined set value range. 2. A product to be transported by injecting a lubricant such as water or oil or a polymer lubricant at an appropriate pressure into an appropriate one or a plurality of places in the pipeline where a highly viscous substance is transported. A method of reducing frictional resistance between pipes to facilitate pipe transportation of highly viscous substances by a transportation pump, and detecting the pressure difference between two points in the pipeline downstream from each lubricant injection point, In the method of automatically controlling the lubricant injection amount so that the value falls within a predetermined set value range, a reciprocating motion such as a piston type or a plunger type that intermittently discharges a highly viscous substance transport pump. When a type pump is used, the stroke position of the piston or plunger of the transport pump or the pressure fluctuation in the transport pipe is detected, and the piston or plunger is in the discharge stroke or the pipe pressure becomes steady. Method characterized in that during synchronized by press-fitting the intermittently lubricant into the pipeline from the lubricant infusion pump or accumulator tank that.