JPS5910334A - Preventive method for separation of solid from liquid in fluid mixture - Google Patents

Abstract

PURPOSE:To perform satisfactorily mixing by connecting a recirculation pipeline to a pipeline for transporting a solid-liquid fluid mixture, and supplying part of the fluid mixture emerging from a mixer again to the mixer. CONSTITUTION:An additive feeder 15 is provided in a pipeline 6 for transporting a fluid mixture. A pipeline 17 is connected to a feeder 15, and an additive tank 8, an additive pump 12 of a continuous supply type, an additive flowmeter 13 and a flow rate control valve 14 are provided to the pipeline 17 from the upper stream side. A flowmeter 16 which detects the flow rate of the solid-liquid fluid mixture is installed to a pipeline 7 for transporting the solid-liquid fluid mixture on the down stream side of the feeder 15, and a mixer 10 is provided in the pipe part on the down stream side of the part where the flowmeter 16 is installed. The pipeline 11 on the down stream side of the mixer 10 and the pipeline 7 on the upper stream side are connected with a recirculation pipeline 24. Then a part of the fluid mixture in the pipeline 11 is recirculated to the upper stream side of the mixer 10 through the pipeline 24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for preventing solid-liquid separation of a solid-liquid mixed fluid, and more particularly to an apparatus capable of adding and supplying an additive for preventing solid-liquid separation in just the right amount.

Due to recent changes in the fuel situation, the value of coal as a fuel is being reconsidered, and solid-liquid mixed liquids are being actively developed to improve the transportability, combustibility, and storability of coal, which is a solid fuel. ing. This solid-liquid mixed fluid is produced by finely pulverizing solids such as coal, mixing the finely pulverized solids and solids with liquids such as water and oil to form a slurry, and transporting the slurry through pipes and storing it in tanks, etc. The greatest advantage is that it can be stored and that solids can be handled almost like liquids. However, since the specific gravity of solids such as coal is higher than that of liquids, solids and liquids separate during storage, making it difficult or impossible to discharge and transport solid-liquid fluids. ing. For this reason, measures have been taken to add additives such as surfactants to the solid-liquid mixed fluid so that the solid-liquid is always uniformly dispersed in the fluid.

FIG. 1 shows a system diagram of a conventional device for preventing separation of this solid-liquid mixed fluid.

The solid l supplied to the crusher 3 is mixed with the fluid 2, atomized, and flows out to the collection tank 4 as a solid-liquid mixed fluid. Next, the solid-liquid mixed fluid is sucked through the pipe line 6 by the transfer pump 5 and discharged into the pipe line 7.

On the other hand, the additive stored in the additive tank 8 is pressurized by the additive pump 9 and is injected into the solid-liquid mixed fluid flowing through the pipe 7 via the pipe 17. The solid-liquid mixed fluid into which the additive has been injected is mixed in the mixer IO through the pipe line 7, the additive is dispersed in the solid-liquid mixed fluid, and the solid-liquid mixed fluid is transferred through the pipe line 11 to a tank (not shown) or the like.

In the above case, it is desirable that the injection ratio of the additive to the solid-liquid mixed fluid is always constant and injected with just the right amount.If the amount of the additive is small, there is a risk that the fluid will separate again.
On the other hand, if the amount is too high, there are problems such as an adverse effect on combustion.

However, since the transport of the solid-liquid mixed fluid cannot always be controlled accurately, the mixing ratio of the additives must also become unstable. For example, even if the pump 5 is used as a constant volume pump to stabilize the discharge flow rate of the mixing casing, the discharge rate will change due to changes in the viscosity of the mixed fluid. In this method, the injection ratio of additives becomes unstable. Furthermore, mixing and stirring of the additive and the mixed fluid was performed only once in mixing jIIA10, and the mixing of the additive itself was insufficient.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus which can eliminate the above-mentioned problems, maintain a correct injection ratio of additives to a solid-liquid mixed fluid at all times, and can perform the mixing of additives in a good manner.

In short, the present invention is configured such that a pipe line for injecting an additive is connected to the upstream side of a pipe line for transporting a solid-liquid mixed fluid, and the additive is injected in accordance with the flow rate of the solid-liquid mixed fluid. If necessary, a recirculation line may be connected to the solid-liquid mixed fluid transport lines upstream and downstream of the mixer to re-supply part of the mixed fluid that has left the mixer to the mixer. This allows better mixing of the solid-liquid mixed fluid and the additive.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The reference numeral 15 in the figure is an additive injector provided for the mixed fluid axis ft and the pipe line 6 on the upstream side of the installation part of the transfer pump 5.
The structure of the syringe is as shown in FIGS. 3 to 5. First, the syringe shown in FIG. 3 will be explained. A venturi 28 is formed in the conduit 6 for transporting the solid-liquid mixed fluid, and a nozzle 19 for injecting the additive 26 is arranged to open on the downstream side of the flow of the fluid 25 with respect to the venturi 28. .

Figures 4 and 5 show another type of syringe construction. In the case of this injector, a plurality of injection nozzles 19a having a plurality of injection holes 27 are arranged with respect to the solid-liquid mixed fluid transport pipe 6, and the injection nozzles 19a are added as uniformly as possible to the flow of the solid-liquid mixed fluid 25. It is configured to inject the agent.

A conduit 17 for injecting additives is connected to the injector 15 having the above configuration. For this pipe line 17, additive tanks 8. Continuous feed additive pump12.
Additive flow meter 13. A flow control valve 14 is provided. On the other hand, the solid-liquid mixed fluid transport pipe line 7 downstream of the additive injector 15
A flow meter 16 is installed to detect the flow rate of the solid-liquid mixed fluid, and a ratio setting device 18 is connected to this flow meter 16 and the aforementioned flow meter 13. It is connected to the valve 14 in a circuit. Flow meter 1
A mixer 10 is installed in the pipe on the downstream side of the installation part 6, and the pipe 11 on the downstream side of the mixer and the pipe 7 on the upstream side are connected by a recirculation pipe 24. There is.

22 is a recirculation pump installed in the same pipe, 21 is a flow meter for measuring the amount of recirculation, 23 is a flow control valve, and 18a is a ratio setting device. It is connected to the flow rate control valve 23 and the flow meter 16 through a signal circuit.

In the above apparatus, the solid-liquid mixed fluid produced in the crusher 3 is sucked by the pump 5 and moves through the pipe line 6, and during this time, the additive is injected in the syringe 15. In this case, the additive injector is determined in the ratio setter 18 in accordance with the flow rate of the solid-liquid mixed fluid measured by the flow meter 16, and the valve 14 is adjusted in accordance with this determined amount to inject a predetermined amount of additive. inject. At the time of this injection, if the actual injection m of the additive is input to the setting device 18 as a correction value using the flowmeter 13, more accurate injection of the additive can be performed.

After the injection of additives, the solid-liquid mixed fluid is transferred to the mixer 10 at t5.
Mix and stir j11! However, the ratio setting device 1.
8a determines a constant [II circulation ratio, and adjusts the opening degree of the valve 23 based on this ratio. This causes a portion of the mixed fluid in line 11 to be recirculated upstream of mixer 10 via line 24 and stirred again in the mixer to disperse the additive more uniformly.

By carrying out this invention, it is possible to inject just enough additive into the solid-liquid mixed fluid, and the solid-liquid mixed fluid can be stabilized with the minimum amount of additive injection.

Furthermore, the additives can be mixed well, and from this point of view as well, the properties of the solid-liquid mixed fluid can be stabilized.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional solid-liquid separation prevention device, Fig. 2 is a system diagram of a solid-liquid separation prevention device according to the present invention, and Fig. 3 is a longitudinal cross-section of an additive injector used in the device according to the present invention. 4 is a longitudinal cross-sectional view of an additive injector showing another embodiment; FIG. 5 is a top view;
The figure is a sectional view taken along line A--A in FIG. 4. 6, 7.11... Solid-liquid mixed fluid transport pipe line 10
...Blender 14, . 23...Flow rate control valve 15...Additive injector 16...Flowmeter for solid-liquid mixed fluid 17...
・Additive injection pipe 18.18a...Ratio setting device 24...Solid-liquid mixed fluid recirculation pipe (lo l No. 5 +9+1''''27

Claims (1)

[Claims] 1. In a system that prevents solid-liquid separation of a solid-liquid mixed fluid by injecting an additive into the fluid, a mixer on the upstream side of a mixer that mixes the solid-liquid mixed fluid and the additive is provided. An additive injection pipe configured to provide an additive injector to a pipe for transporting a solid-liquid mixed fluid, and to adjust the amount of additive injected into the additive injector in accordance with the flow rate of the solid-liquid mixed fluid. A device for preventing separation of a solid-liquid mixed fluid, characterized by connecting channels. 2. A flow rate control valve is installed in the additive injection line, a flow meter is installed in the solid-liquid mixed fluid transport line, and the flow rate control valve and flow meter are connected to the ratio setting device to increase the solid-liquid flow rate. 2. The device for preventing separation of a solid-liquid mixed fluid according to claim 1, wherein the device is configured to be able to adjust the amount of additive to be injected in accordance with the flow rate of the mixed fluid. 3. Connect solid-liquid mixed fluid recirculation pipes to the solid-liquid mixed fluid supply pipes on the upstream and downstream sides of the mixer installation part, and at least part of the solid-liquid mixed fluid that exits the mixer is transferred to the mixer. 3. A device for preventing separation of solid-liquid mixed fluid according to claim 1 or 2, characterized in that the device is recirculated to the upstream side. 4. Provide a flow rate control valve for the solid-liquid mixed fluid recirculation pipeline, and connect a flow meter for detecting the solid-liquid mixed fluid flow rate on the upstream side of the mixer to each ratio setting device. 4. The solid-liquid mixed fluid separation prevention device according to claim 3, wherein the device is configured to control the amount of recirculation in accordance with the flow rate. 5. Claim 1, characterized in that the additive injector is a venturi provided in a conduit for transporting a solid-liquid mixed fluid, and an additive injection nozzle arranged in this venturi.
The device for preventing separation of a solid-liquid mixed fluid according to any one of items 1 to 4. 6. Claim 1, characterized in that the additive injector is formed by arranging one or more nozzles having a plurality of injection holes with respect to the solid-liquid mixed fluid supply pipe.
The device for preventing separation of a solid-liquid mixed fluid according to any one of items 1 to 4.