JPS5922817A - Transport method of liquid containing solid particles - Google Patents

Abstract

PURPOSE:To prevent abrasion of a valve in a transport apparatus where liquid containing solid particle supplied to a cylinder chamber is discharged by reducing and increasing pressure by supplying and discharging liquid to and from a cylinder without differential pressure before and behind the valve. CONSTITUTION:In a reduced-pressure transport apparatus for high-pressure liquid containing solid particles, in the illustrated condition that an increasing stroke is completed, and all valves are closed, a liquid supply valve 4 is opened so that the above liquid is supplied from a high-pressure liquid supply line 7 to a cylinder chamber 6 to move a plunger 3 to the right. After a fixed quantity of liquid is supplied to the chamber 6, the liquid supply valve is closed. Subsequently, the plunger 3 is further moved to the right to reduce the pressure in the chamber 6 same as the liquid pressure in an outlet line 8 of a liquid discharge valve 5. After that, the liquid discharge valve 5 is opened, and the plunger 3 is moved to the left by external force to discharge the liquid in the chamber 6. After the completion of discharging liquid, the liquid discharge valve 5 is closed, and the pressure of remaining liquid in the chamber 6 is increased by the plunger 3. Thus, one stroke is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for transporting a liquid containing solid particles, and in particular, a method for transporting a liquid containing solid particles, which includes a movable member that can reciprocate within a cylinder chamber, and supplies the liquid containing solid particles to the cylinder chamber through a liquid supply valve. The present invention also relates to a method for transporting a solid particle-containing liquid using a transport device that reduces or increases the pressure of the solid particle-containing liquid and discharges the solid particle-containing liquid from a cylinder chamber via a drain valve.

Various chemical platforms have been known in the past that include a step of reducing or increasing the pressure of a liquid containing solid particles or dissolved gas (hereinafter referred to as a liquid containing solid particles). This will be explained using as an example a coal liquefaction plant, which has been re-recognized in recent years due to the deterioration of the petroleum situation. In this coal liquefaction plant, coal is pulverized and dehydrated, then a solvent is added to form a slurry, this is subjected to external pressure and preheating, and then liquefied by a hydrogenation reaction, and the resulting coal liquefaction product solution is separated into gas and liquid. , the pressure is reduced, and then the heavy and light oil products are fractionally distilled. Conventionally, this depressurization of the coal liquefaction product solution was carried out using the throttling effect of a flow control valve, but the life of the valve was short due to wear due to ash and other mineral particles, and the coal liquefaction product solution In view of the fact that the energy contained in solutions is wasted as heat energy, devices have been proposed in recent years to recover this energy. This type of device usually connects multiple cylinders using a crank mechanism, while
As for fluid, they are connected in parallel via liquid supply and drain valves, and the coal liquefaction product solution is sequentially supplied to each cylinder chamber via the liquid supply valve, and the pressure energy is transferred to a crank mechanism connected to a piston, plunger, etc. While the coal liquefaction product/liquid, which has been depressurized from the cylinder chamber, is recovered as rotational energy, it is discharged via the UI liquid channel.
During the depressurization process, the gas dissolved in the high-pressure coal liquefaction product/8 liquid flashes, and the flash gas generation varies depending on changes in plant operating conditions such as i'fRlIC1 pressure, Opening/closing timing also varies.

Therefore, when the supply and drain valves are opened and closed at a certain timing, the cylinder chamber may become over-expanded or under-tensioned +1iZ, or during the suction stroke, there may be over-compression or under-compression, generating surge pressure. This may cause damage to the piping system, liquid supply Jr., crank mechanism, etc. Moreover, if there is a pressure difference before and after the -IT, the liquid will be accelerated when the valve is opened and closed, creating a turbulent flow that will wear out the -J valve. Therefore, a device that detects the internal pressure of the plunger and opens and closes the valve at the optimal timing is required, for example, in Japanese Patent Application No. 56-'214.
It was proposed by the specification of No. 423. The movement gear of this power recovery device includes a pressure detector that detects the pressure inside the cylinder of the power recovery device, and a rotation angle of the crankshaft or camshaft that corresponds to the stroke of the plunger that reciprocates within the cylinder. a rotation angle detector, a calculation unit that compares and calculates an output signal from the pressure detector with a set pressure signal corresponding to the output signal of the rotation angle detector, and a liquid supply/drain valve based on the output signal from the calculation unit. It is characterized by having a control device consisting of a cam adjustment mechanism that adjusts the rotation angle of the cam that drives the Jf body, but it is based on a crank mechanism and a moving valve mechanism synchronized with the crank mechanism. 11E, it is difficult for the human body to become obsolete if the device is large and the motion conversion part becomes large and the heavy use becomes excessive.

On the other hand, as a device for recovering energy from high pressure liquid, there is a power recovery type pressure liquid feeding device described in Japanese Patent Publication No. 31-3802. This device has two reciprocating liquid pumps that act on the front and back sides of the liquid sending piston, respectively. At a relatively final stage, the recovery liquid side of the other liquid sending pump is connected to the 76 pressure device and the low pressure device, respectively, and the supply liquid side is connected via an external pressure pump for piston return. It is characterized by the fact that it is supplied with liquid, and power is recovered without using a crank mechanism.

However, this device uses a mechanical valve on the high-pressure recovered liquid side and a reverse-11 valve on the low-pressure supply liquid side, so the valve on the high-pressure recovered liquid side cannot be opened or closed when there is liquid flow. When used as a power recovery device in the Niokel depressurization process of a coal liquefaction plant, the 4t wetted parts will wear out due to solid particles such as ash and catalyst in the coal liquefaction product. 1. Valve replacement (1, replacement, etc.) must be carried out frequently, and 1.
When this happens, the piping system suddenly opens and closes, creating a problem with the piping system (which causes shocks due to the rapid flow of liquid).

The present invention has been made in view of these problems, and is aimed at dispensing or discharging solid particles or a liquid containing them (in addition, 1 ml of gas) into and out of a cylinder. ,
) A method for transporting a liquid containing solid particles that can be carried out without creating a pressure difference before and after the above, and thus prevents wear of the liquid contact parts of the valve and prevents the generation of surge pressure. It provides:

A method for transporting a liquid containing solid particles according to the present invention (equipped with a movable member that can reciprocate within a cylinder chamber, and supplying a liquid containing solid particles into the cylinder chamber through a liquid supply valve,
In a method for transporting a solid particle-containing liquid using a transport device configured to stir a pressure-reduced solid particle-containing liquid through a drain valve, the method includes: The movable member is variable in displacement, and after supplying a predetermined amount of the solid particle-containing liquid to the cylinder chamber, the movable member is displaced before one drop of the solid particle-containing liquid in the cylinder chamber is discharged and transported. While making the liquid pressure in the cylinder chamber the same as the pressure on the outlet side of the I'llI liquid valve, after discharging the solid particle-containing liquid from the cylinder chamber, and before supplying the solid particle-containing liquid to the cylinder chamber, It is characterized in that the rJ moving member is displaced to make the hydraulic pressure in the cylinder chamber the same as the pressure on the liquid supply side.

That is, the present invention changes the displacement gauge of a movable member that reciprocates within the cylinder chamber according to the state of the liquid supplied or remaining in the cylinder chamber, and reduces or increases the pressure within the cylinder chamber to a predetermined pressure. It was designed to allow

The present invention will now be described with reference to the accompanying drawings.

Solid particle-containing liquid transport device shown in FIG.
Reference numeral denotes a drain valve for discharging the solid particle-containing liquid whose pressure has been reduced or increased to a predetermined pressure, 6 is a cylinder chamber, 7 is a line on the inlet side of the liquid supply valve, and 8 is a line on the outlet side of the drain valve. When this device is used for transporting high-pressure liquid under reduced pressure, as shown in Figure 2,
The operation cycle consists of four strokes: liquid supply stroke (state A → state B), pressure reduction stroke (state 13° state C), first liquid stroke (state C - state D), and pressure increase stroke (state D → state A). have,
The displacement of the plunger 3 is made variable so as not to cause overcompression or undercompression or overexpansion or underexpansion in states A and C, and its operation is performed as follows according to the present invention. In FIG. 1, the pressure of the solid particle-containing liquid in the cylinder chamber 6 has been increased to the same pressure as the liquid pressure in the line 7, and the liquid supply valve 4 and drain valve 4 are in state A, which is closed. Well, first of all.

Open the liquid supply valve 4 and supply the high-pressure liquid containing solid particles to the line 7.
A liquid supply stroke is performed by supplying liquid from the liquid to the cylinder chamber 6, and the plunger 3 is displaced to the right in the figure. After a predetermined amount of solid particle-containing liquid is supplied into the cylinder chamber 6, the displacement of the plunger 3 is stopped I-, and then the liquid supply valve 4 is closed to complete the liquid supply process.

After the liquid supply stroke is completed, the plunger 3 is further displaced to the right in the figure, and the solid particle-containing liquid in the cylinder chamber 6 is transferred to the ul liquid valve f.
Same as the liquid pressure in the outlet side line 8 of 5)) Reduce the pressure in E with the ox. The displacement of the plunger 3 at this time varies depending on the amount of dissolved gas in the solid particle-containing yellowtail liquid in the cylinder chamber 6, liquid temperature, pressure, etc. The means for displacing the plunger 3 during this decompression stroke and the means for ending the liquid supply stroke are as follows:
As in the embodiments described below, it is equipped with a liquid supply valve and a liquid discharge valve r,
A plunger type cylinder disposed opposite the cylinder 1 may be used, or an actuator may be used.

When the hydraulic pressure in the cylinder chamber 6 is reduced to the same pressure as the hydraulic pressure in the twin 8, the plunger 3 is stopped, the pressure reducing stroke is completed, and state C is reached. Next, the υ1 liquid nozzle r5 is opened, and then the plunger 3 is displaced to the left in the figure by an external force, and the depressurized liquid containing solid particles is discharged from the cylinder chamber 6.
Transport it out. When the end of the draining stroke is reached in this way, the plunger 3 is stopped, the draining valve 5 is closed, and the draining stroke ends (state D). Thereafter, an external force is applied to the plunger 3 to increase the pressure of the solid particle-containing liquid remaining in the cylinder chamber 6 to the same pressure as the liquid pressure in the line 7, and then the plunger 3 is stopped to perform the GeII]'E stroke. After that, the state returns to state A, and thereafter the operation cycle described above is repeated.

Note that the end of the pressure reduction stroke and the pressure increase stroke is carried out by stopping the plunger, but the stop timing is determined by detecting the pressure in the cylinder chamber 6 and the pressure in the lines 7 and 8 with a pressure sensor, and checking the output. The plunger (1) may be stopped by a signal, and as in the embodiment described later, an opposing plunger is provided and the fluid pressure in the liquid supply line and drain line connected to the opposing plunger is controlled. It may be maintained constant.

In the above embodiment, a planar cylinder is used, which is a single-rod piston double-acting cylinder, and a liquid supply valve and a liquid drain valve are connected to each cylinder chamber.
It may be made to operate similarly to the embodiment described later.

Therefore, according to the method of the present invention, at the time of starting the supply of the solid particle-containing liquid to the cylinder chamber and the start of discharging the solid particle-containing liquid from the cylinder, a differential pressure is created before and after the liquid supply valve and the liquid drain valve. Since the valve ↑ is opened when the valve is closed, there is no acceleration phenomenon of the liquid caused by changes in the opening degree of the valve, which prevents wear of the valve body, valve seat, and other liquid-contacted parts of the valve. 8
No surge pressure is generated in the pipe J. In addition, at the end of the liquid supply and drain strokes, the valve is closed with no liquid flow, so there is no acceleration phenomenon in the liquid, which prevents wear on the parts in contact with the valve and allows for +L. You can get the same effect.

FIG. 3 shows an example in which the present invention is applied to a power recovery device incorporated in the pressure reduction process of a coal liquefaction plant.
c, IIA~iic are plunger type cylinders, 4A~4
c, 14A-, 14C are liquid supply valves, 5A-5G, 15A-
15G is a drain valve, 21 and 23 are variable discharge pumps, 2
2 is a stone slurry tank, 24 is a coal slurry supply line,
25 is a preheater, 26 is a coal liquefaction reaction tower, 27 is a high pressure side gas-liquid separation tower, 28 is a low pressure side gas-liquid separation tower, 29 is an emergency pressure reducing valve, 30 is a liquid level sensor, MO, M are pump drives It is a motor for

In this coal liquefaction plant, a power recovery device consisting of three pairs of plunger-type cylinders IA to Ic, IIA to 11C and a pump 23 are used to generate a power of 200 to 300
(The pressure is increased to g/c+7, and the lime slurry is transported to the preheater 25 via the lime slurry supply line 24 to approximately 300 to 400°C [After being preheated, it is sent to the reaction tower 26, where a liquefaction reaction is carried out using a catalyst and hydrogenation. It is transferred from the reaction tower 26 to the high-pressure side gas-liquid separation tower 27 as a stone-like liquefied product solution.

The gas separated from the solution in this gas-liquid separation tower 27 is discharged from the top of the tower to the outside of the system via line 31, and the lime liquefaction product solution is passed through line 7 to cylinders IA and IC for reduced pressure transportation of the power recovery device. After being reduced to a predetermined pressure of approximately 50 to 100 kg/ca, the gas is transported via line 8 to the low-pressure side gas-liquid separation column 284, where it is separated into gas and liquid again.

The transportation of coal slurry and lime liquefaction product solution in this coal liquefaction plant is carried out according to the present invention as follows. Incidentally, since the operations of the cylinders in each row are completely the same except for the phase difference, the system of cylinders LA and IIA will be mainly explained.

In the illustrated state, the reduced pressure transport cylinder IA has completed its external pressure stroke in the same way as the cylinder 1 in FIG. t
The liquid pressure in 6A is raised to the same pressure as that in line 7 by the casing, and coal slurry is stored in the cylinder chamber 16A of the cylinder IIA for transportation under pressure.
The pressure is increased to the same level as the internal fluid pressure. Liquid supply on the cylinder side for reduced pressure transportation? 48, drain valve 5A, 4-pressure transport cylinder side liquid supply valve 14A, and drain valve 15. A is all closed, and the hydraulic pressure in the cylinder chamber 6A of cylinder IA is reduced to line 7.
In state A where the pressure is the same as that in the
and then open the pressurized transport side drain) F15A,
The high-temperature, high-pressure stone-like liquefied product solution is transferred to the high-pressure side gas-liquid separation tower 27.
The pressure energy causes the coal slurry in the cylinder chamber 6A to be fed to the coal slurry supply line 24 via the drain valve 15A and the reverse tL valve 19. The coal slurry fed to this wine 24 is
The coal slurry discharged from the variable discharge pump 23 is transported to the preheater 25, and its total flow rate is measured by a level sensor 30 that detects the liquid level in the high-pressure side gas-liquid separation tower 27.
The discharge amount is maintained constant by the pump 23, which is controlled by the output signal from the pump 23.

When a predetermined amount of coal liquefaction product solution is supplied to the cylinder chamber 6A, the pressure-increasing transport side drain valve 15A is closed IF to stop the plungers 3A and 13A, and then the pressure-reducing transport side liquid supply valve 4
Closing A leads to state B in FIG. Next, when the external pressure transport side liquid supply valve 14A is opened, the pressure difference between the liquid pressure in the line 17 and the liquid pressure in the cylinder chamber 6A causes the plungers 3A, 13 to
A moves further to the left, causing a flash of dissolved gases in the lime liquefaction product solution as well as depressurization of the solution and coal slurry. At this time, the lime slurry discharged from the cylinder chamber 16A is supplied to another cylinder, for example, llc, which is in the supply stroke for the coal slurry (drainage stroke for the coal liquefaction product solution).Inside the cylinder chamber 6A After the fluid pressure in line 17 becomes equal to the fluid pressure in line 17, fluid supply valve 11
By closing 4A, the plungers 3A and 13A are stopped, resulting in state C in FIG. The pressure that reaches this state C is always maintained constant by the action of the □ pump 21, but
The volume inside the cylinder chamber 6A varies because the amount of displacement of the plunger varies depending on the properties of the coal liquefaction product solution when it is supplied to the cylinder chamber 6A. Note that the hydraulic pressures in line 17 and line 8 are set to be the same pressure.

When the pressure reduction process for this -rEi charcoal neutralization product solution is completed, first open the reduced pressure transport side drain valve 5A, then open the external pressure transport side supply liquid: /r14A, and the lime slurry discharged from the pump 21 The depressurized coal liquefaction product solution in the cylinder chamber 6A is supplied to the cylinder chamber 16A to displace the plungers 3A and 13A in the desired direction.
5h, and transported to the low-pressure side gas-liquid separation column 28. Thereafter, after the plungers 3A and 13A are displaced from a predetermined position, the liquid supply valve 14A is closed and the plungers 3A and 13A are
By stopping 13A and then closing drain valve 5A, the state shown in FIG. 2 is reached. After that, when the external pressure transport side drain valve 15A is opened, the high pressure lime slurry discharged from other cylinder systems in the liquid supply process for the coal liquefaction product solution is introduced into the cylinder 16A, and is thereby discharged into the cylinder chamber 6A. The remaining coal liquefaction product solution is externally pressured to the same pressure as the liquid pressure in line 7, and then drained into the drain pipe P15'A.
By closing, the device returns to the initial state, that is, state A in FIG. 2, and thereafter repeats the operation cycle.

Through such an operation cycle, the three pairs of cylinder systems are sequentially operated with different phases, and the cylinder l
In A, 'lB, and lC, high-pressure lime liquefaction product solution is transported under reduced pressure to cylinders IIA and lIB.

At 11C, coal slurry is transported by external pressure.

As is clear from the above description, according to the present invention, the hydraulic pressure in the cylinder is changed to the hydraulic pressure in line 7 or line 8 at the start of liquid supply to the cylinder for reduced pressure transportation or at the start of the liquid draining process from the cylinder. Since the liquid supply valve 4A and the liquid drain valve 5A are opened after the pressure is set to the same as that of 6, there is no pressure difference before and after the
Therefore, there is no acceleration phenomenon of the liquid or surge pressure caused by the opening and closing of the valve, and wear of the liquid-contacting parts of the valve can be prevented, and no impact or the like is caused to the piping system.

Further, since the amount of displacement of the plunger of the cylinder is variable and there is no part like a crank mechanism for converting rotational motion, the structure is simple and the capacity can be easily increased, which provides excellent effects.

In addition, in the above embodiment, at the end of the external pressure stroke and at the end of the pressure reduction stroke, the external pressure transport side drain valves 15A to
15C or the external pressure transport side liquid supply valves 14A to 14C are closed, and after opening the reduced pressure transport side liquid supply valves 4A to 4C or the reduced pressure transport side 5A to 5C, the drain valve 15A-15 is opened.
G or the liquid supply valves 14A to 14c are opened to perform the liquid supply stroke or the liquid drain stroke, but these valves do not necessarily have to be closed once at the end of the external pressure stroke or the pressure reduction stroke, After the internal pressure of the cylinder chamber in the transport cylinder chamber A reached equilibrium with the hydraulic pressure in line 7 or line 8, the drain valves 15A to 15C or the liquid supply valves 14A to 14C on the external pressure transport side were opened. Leave the liquid supply valves 4A to 4C on the external pressure transport side! Alternatively, the liquid supply process or the liquid drain process may be started by opening the liquid drain valves 5A to 5C.

Further, in the above embodiment, the cylinder IA-1 for reduced pressure transportation is
The control and drive mechanism for the plunger G is composed of a plunger-type cylinder with variable displacement and a pump 21.
This may be accomplished by providing a sensor connected to the plunger of the IC and detecting the hydraulic pressure within each cylinder chamber, and controlling the actuator using a signal from the sensor.

Further, in the above-mentioned embodiments, the transport under reduced pressure of the coal liquefaction product solution has been described, but it goes without saying that the present invention can also be applied to transport under external pressure.

Although both the coal slurry and the coal liquefaction product solution contain solid particles, the lime slurry has less tendency to wear out the parts in contact with the valve than the lime liquefaction product solution. In the example of
Even if 14A to 14C' and 15A to 15G are opened and closed, the wear on the valves will not increase as much as in the conventional case, but instead of using coal slurry, solid substances such as hydraulic oil and solvent for producing lime slurry can be used. By using liquids that don't contain liquids, the amount of t+c can be reduced.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a solid particle-containing liquid transportation device used to carry out the method of the present invention, Fig. 2 is an acupressure diagram showing its operation cycle, and Fig. 3 is a coal sludge diagram as an example of the method of the present invention. IJ-1'! FIG. 2 is a system diagram of a coal liquid fhy plant applied to a reduced pressure transport device for a solid particle-containing liquid used for pressure transport. 11A-1G...Cylinder, 3.3A-3C...
・Plunger, 4.4A to 4C...liquid supply valve,
5. 5A to 5C...Drain valve, 7...Liquid supply line, 8...Drain valve outlet side.Patent applicant: Kobe Steel, Ltd. Agent: Patent attorney Figure 1, Figure 2, Figure 3, Figure 3, and t

Claims (1)

[Claims] (1) Equipped with a movable member capable of reciprocating within the cylinder chamber, a liquid containing solid particles is supplied to the cylinder chamber via a liquid supply valve, and the liquid containing solid particles is reduced in pressure or is seated in a row via a drain valve. In a method for transporting a liquid containing solid particles using a transport device that discharges and stirs the liquid from a cylinder chamber, the movable member has a variable displacement, and the liquid containing solid particles is injected into the cylinder chamber in a predetermined amount. After supplying, before discharging the solid particle-containing liquid in the cylinder chamber, the movable member is displaced to make the liquid pressure in the cylinder chamber the same as the pressure on the side for the drain valve, while solid particles are removed from the cylinder chamber. After discharging the solid particle-containing liquid and before supplying the solid particle-containing liquid to the cylinder chamber, the movable member is displaced to bring the liquid pressure of the residual liquid in the cylinder chamber to the same pressure as the liquid supply valve inlet pressure. A method for transporting a liquid containing solid particles, the method comprising: