WO2010133078A1

WO2010133078A1 - Method and system for eliminating accelerating flow in long-distance slurry transportation pipeline

Info

Publication number: WO2010133078A1
Application number: PCT/CN2010/000094
Authority: WO
Inventors: 安建; 普光跃; 黄朝兵; 潘春雷
Original assignee: 云南大红山管道有限公司
Priority date: 2009-05-19
Filing date: 2010-01-21
Publication date: 2010-11-25
Also published as: CN101691906A

Abstract

A method for eliminating the accelerating flow in a long-distance slurry transportation pipeline and the system thereof are disclosed. An energy-absorbing pipe (2) comprising energy-absorbing plates (3) is connected in parallel with the main pipe (1) at the downstream of the U-shape pipeline or at the terminal station. Each end of the energy-absorbing pipe (2) is connected to the main pipe (1) respectively with an energy-absorbing valve (4, 5), and a control valve (6) is provided in the main pipe (1). According to the rheological behavior of slurry, the viscosity coefficients of the slurry and water can be calculated, thereby the redundant energy at the high position where the slurry drives water is derived. And whether an accelerating flow occurs at the high position or not could be known according to the pressure change of the pressure gauge (7) installed at the high position. Once an accelerating flow occurs, the energy-absorbing valves (4, 5) are opened, the control valve (6) is closed, and the accelerating flow could be eliminated by the energy-absorbing plates (3) driving the flow at the high position backward.

Description

Method and system for eliminating long-distance slurry pipeline transportation and accelerating flow in a process

The invention belongs to the field of long-distance slurry pipeline transportation, and particularly relates to an application of an energy dissipation panel in suppressing acceleration flow. Background technique

When the long-distance pipeline transportation of solid materials is carried out by the principle of hydraulics, the transportation distance is as small as several tens of kilometers and as many as nearly one thousand kilometers. Therefore, according to the topography, there will be a sinuous pipeline on the way of the pipeline, and the slurry is pushed in the batch. In the middle, because the dynamic viscosity coefficient of the slurry is larger than the dynamic viscosity coefficient of water, and the specific gravity of the slurry is also larger than that of water, the acceleration flow is generally generated at the high point of the u-shaped pipe, especially at high In the area of the drop, this brings great harm to the service life of the pipeline. Therefore, in the process of long-distance solid material pipeline transportation, the accelerated flow must be eliminated to ensure safe, stable and efficient operation of the long-distance slurry pipeline. Summary of the invention

In order to solve the above problem of accelerating flow in the long-distance slurry pipeline transportation process, the present invention discloses the following technical solutions:

In the rear section of the U-shaped pipeline or the main pipeline of the terminal station, a dissipative pipeline in which an energy dissipation plate is arranged is connected in parallel, and both ends of the energy dissipation pipeline are connected in parallel with the main pipeline through the first energy dissipation valve and the second energy dissipation valve, and the main pipeline is provided There are control valves.

According to the rheological properties of the slurry, the viscosity coefficient of the paddle body and the viscosity coefficient of the water are obtained, so that the excess energy at the high point when the slurry is pushed is obtained;

According to the change of the pressure gauge installed at the high altitude, it is known whether the point generates an acceleration flow; When the acceleration flow occurs, the first and second energy dissipation valves are opened, the main pipeline control valve is closed, and the high-point fluid is reversed by the energy dissipation plate to eliminate the acceleration flow.

By adopting the system and method of the invention, the high-point accelerating flow problem of the u-shaped pipeline during batch transportation is solved, and the long-distance slurry pipeline is ensured to operate safely, stably and efficiently.

DRAWINGS

Figure 1: The present invention eliminates the acceleration flow system diagram.

Description of the reference signs:

1 - main pipe; 2 - energy dissipation pipe; 3 - energy dissipation plate; 4 - first energy dissipation valve;

5 - second energy dissipation valve; 6 - main pipeline control valve; 7 - pressure gauge.

detailed description

As shown in FIG. 1, in the rear section of the U-shaped pipe or the main pipe 1 of the terminal station, a section of the energy dissipation pipe 2 in which the energy dissipation plate 3 is disposed is connected in parallel, and the two ends of the energy dissipation pipe 2 pass through two control valves 4, 5 It is connected to the main pipe 1, and a control valve 6 is also disposed on the main pipe 1. Whether the acceleration flow is generated according to the high point of the front end and the valve is used to control whether or not the energy dissipation plate is incorporated.

During the slurry pushing process, when the slurry reaches the high point of the U-shaped pipe, it is known by the pressure gauge 7 installed at the high point whether there is an acceleration flow generation, and when the pressure changes downward, it indicates that an acceleration flow is about to be generated, when When the pressure value is lower than 200KPa, the first energy dissipating valve 4 and the second energy dissipating valve 5 at both ends of the energy dissipating pipe are opened, and then the main pipe valve 6 is closed. At this time, the energy dissipating plate 3 acts to generate a back pressure, and the fluid is reversed. The acceleration flow at the high point is eliminated. After the slurry passes through the low point of the U-shaped pipe, the value of the pressure gauge 7 installed at the high point starts to change upward. When the pressure value exceeds 2000 KPa, the acceleration flow does not exist, and the current is turned on. The main pipe valve 6, then closes the first energy dissipating valve 4 and the second energy dissipating valve 5, and removes the function of the energy dissipating plate to return to the normal conveying state.

Claims

Claim

1. A method for eliminating accelerated flow in a long-distance slurry pipeline transportation process, wherein a dissipative energy conduit in which an energy dissipation plate (3) is disposed is connected in parallel in a main pipe (1) of a rear section of a u-shaped pipe or a terminal station (2), the energy dissipation pipeline (2) is connected in parallel with the main pipeline (1) through the first energy dissipation valve (4) and the second energy dissipation valve (5), and the control valve is provided in the main pipeline (1) (6) ), which is characterized by the following steps:

According to the rheological properties of the slurry, the viscosity coefficient of the slurry and the viscosity coefficient of the water are obtained, so that the excess energy at the high point when the slurry is pushed is obtained;

According to the change of the value of the pressure gauge (7) installed at the altitude, it is known whether the point generates a velocity flow;

When accelerating flow occurs, open the first and second energy dissipating valves (4, 5), close the main pipe control valve (6), and push the high point fluid through the energy dissipating plate (3) to eliminate the acceleration flow.

2. The method according to claim 1, wherein: when the pressure value is lower than 200 KPa, the first energy dissipating valve (4) and the second energy dissipating valve (5) at both ends of the energy dissipating pipe (2) are opened, Then close the main pipe valve (6).

3. The method according to claim 1 or 2, wherein: after the pressure value exceeds 2000 KPa, the main pipe control valve (6) is opened, and then the first energy dissipating valve (4) and the second energy dissipating valve are closed ( 5), return to normal delivery.

4. A system for eliminating accelerated flow during long-distance slurry pipeline transportation, comprising a main pipeline (1) and an energy dissipation pipeline (2), wherein the main pipeline (1) is located at a rear section or terminal station of the U-shaped pipeline, and energy dissipation The energy dissipating plate (3) is arranged in the pipe (2), and both ends thereof are connected in parallel with the main pipe (1) through the first energy dissipating valve (4) and the second energy dissipating valve (5), and the main pipe (1) is provided There is a control valve (6).

5. System according to claim 1, characterized in that a pressure gauge (7) is further provided upstream of the main pipe.