AU2010230782B2

AU2010230782B2 - Undisturbed switching method for operating modes of multi-stage pump station and energy dissipater thereof

Info

Publication number: AU2010230782B2
Application number: AU2010230782A
Authority: AU
Inventors: Jian AN; Chaobing Huang; Chunlei Pan; Guangyue Pu
Original assignee: Yunnan Dahongshan Pipeline Co Ltd
Current assignee: Yunnan Dahongshan Pipeline Co Ltd
Priority date: 2009-04-02
Filing date: 2010-01-21
Publication date: 2013-03-14
Anticipated expiration: 2030-01-21
Also published as: BRPI1012281A2; WO2010111884A1; AU2010230782A1; CN101603524B; BRPI1012281B1; CN101603524A

Abstract

There is provided an energy dissipater used for undisturbed switching of operating modes of a multi-stage pump station, and an undisturbed switching method for switching between a continuous pumping mode and an independent mode of the multi-stage pump station by utilizing the energy dissipater. A first ball valve (FV01) and a second ball valve (FV02) are arranged between a forward-stage pump station and a main pump inlet of the multi-stage pump station. A third ball valve (FV03) is arranged between the output end of the first ball valve (FV01) and an agitating tank/pool. A feeding pump ball valve (FV04) is arranged between the output end of the second ball valve (FV02) and a feeding pump (3). The energy dissipater (1) comprises a ceramic energy dissipating plate (2), an input ball valve (FV06) arranged at the front end of the energy dissipating plate, an output ball valve (FV07) arranged at the back end of the energy dissipating plate, and a control ball valve (FV05), wherein the input ball valve is connected with the output end of the third ball valve (FV03), the output ball valve (FV07) is connected with one end of the agitating tank/pool, and the control ball valve (FV05) is arranged between the third ball valve (FV03) and the agitating tank. By utilizing the energy dissipater and the method, the pressure at the inlet is ensured not to change when the main pump is switched.

Description

Undisturbed switching method for operating modes of multi-stage pump station and energy dissipater thereof Technical Field The present invention relates to a field of long distance slurry pipeline transportations, and more particularly, to an undisturbed switching method for operating modes of a multi-stage pump station. Background of the Invention When hydraulic principles are used to perform long distance pipeline transportations of solid materials, since the transportation distance is at least dozens of kilometers and at most up to a thousand kilometers, it is necessary to additionally arrange a plurality of pressurization pump stations on a pipeline path to complete the transportation task. When solid materials are transported by pipelines, since the speed of the slurry must be controlled in a certain range, respective pump stations often need to be switched between a continuous pumping mode and an independent operating mode; because a main pump of respective high-pressure pump stations is a positive displacement pump and this kind of main pump must provide an inlet pressure more than 300kpa, if the inlet pressure is less than 300kpa, the main pump will stop protectively. Usually, the inlet pressure when the slurry is transported by pipelines is about 800kpa, and the pressure of the slurry when fed by a feeding pump to a main pipeline during switching also should be about 800kpa. If the two pressures are not the same, the resulted uneven pressure will lead to the inconsistent flow rate of the slurry transportation, which will eventually result in the stop of the main pump. Therefore, the inlet pressure of the main pump must be ensured to stay constant in the course of switching. As shown in Fig. 1, when operating in the independent mode, ball valves FVO1 and FVO3 are opened, and a ball valve FV02 is closed. When the continuous pumping mode is to be switched into, the ball valve FV02 needs to be opened, but an outlet of the ball valve FVO3 is connected to an agitating tank/pool and communicates with the air. So, after the ball valve FV02 is opened, the inlet pressure of the main pump is caused to be zero, which will result in that the inlet pressure of the main pump is low and the main pump stops protectively. Similarly, in the continuous pumping mode, the ball valves FV01 and FV02 are opened, and the ball valve FV03 is closed. When the independent mode is to be switched into, the ball valve FVO3 needs to be opened, which will also result in that the inlet pressure of the main pump is zero so that the main pump stops. Summary of the Invention Hereinafter, in order to realize undisturbed switching of operating modes of a multi-stage pump station, the present invention proposes the following technical solutions: The present invention discloses an energy dissipater used for undisturbed switching of operating modes of a multi-stage pump station. In the multi-stage pump station, a first ball valve and a second ball valve are arranged between a forward-stage pump station and an inlet of a main pump; a third ball valve is arranged between an output end of the first ball valve and an agitating tank/pool; a feeding pump ball valve is arranged between an output end of the second ball valve and a feeding pump. The energy dissipater comprises a ceramic energy dissipating plate, an input ball valve arranged at a front end of the energy dissipating plate, an output ball valve arranged at a back end of the energy dissipating plate, and a control ball valve, wherein the input ball valve is connected to an output end of the third ball valve, the output ball valve is connected to one end of the agitating tank/pool, and the control ball valve is arranged between the third ball valve and the agitating tank. The present invention also discloses an undisturbed switching method for switching a continuous pumping mode into an independent mode of the multi-stage pump station by utilizing the energy dissipater, including specifically: initiating the feeding pump; opening the feeding pump ball valve, the input ball valve and the output ball valve of the energy dissipating plate; closing the control ball valve; then opening the third ball valve, the energy dissipating plate causing pressure differences between two ends of the third ball valve to be zero; and then closing the second ball valve to finish the switching. An inlet pressure of the main pump is ensured to stay constant in the course of the switching. The present invention also discloses an undisturbed switching method for switching the independent mode into the continuous pumping mode of the multi-stage pump station by utilizing the energy dissipater, including: opening the input ball valve and the output ball valve of the energy dissipating plate; closing the control ball valve; initiating the feeding pump; opening the feeding pump ball valve; opening the third ball valve, the energy dissipating plate causing the pressure differences between the two ends of the third ball valve to be zero; then closing the second ball valve, opening the control ball valve to finish the switching. The inlet pressure of the main pump is ensured to stay constant in the course of the switching. Brief Description of the Drawings Fig.1 is a view showing an operating mode of a multi-stage pump station in the prior art; and Fig.2 is a schematic view showing the undisturbed switching of operating modes of a multi-stage pump station of the present invention. Reference remarks: 1: energy dissipater; 2: energy dissipating plate; 3: feeding pump FVO1: first ball valve; FV02: second ball valve; FVO3: third ball valve; FV04: feeding pump ball valve; FV05: control ball valve; FV06: input ball valve; and FV07: output ball valve. Detailed Description of the Preferred Embodiment A more detailed description will be performed on the present invention in combination with the drawings. As shown in Fig.2, a first ball valve FVOl and a second ball valve FVO2 are arranged between a forward-stage pump station and an inlet of a main pump, a third ball valve FVO3 is arranged between an output end of the first ball valve FVOl and an agitating tank/pool, a feeding pump ball valve FV04 is arranged between an output end of the second ball valve FV02 and a feeding pump. The present invention additionally arranges a set of energy dissipater I at a back end of the third ball valve FV03, as shown in a dotted wireframe in the Fig.2. The energy dissipater 1 comprises a ceramic energy dissipating plate 2, an input ball valve FV06 and an output ball valve FV07. The energy dissipating plate 2 is used to balance pressures between two ends of the energy dissipating plate 2. At the same time, a control ball valve FV05 is added between the third ball valve FVO3 and the agitating tank. When a continuous pumping mode is switched into an independent mode, the feeding pump 3 is initiated; the ball valves FV04, FV06 and FV07 are opened and the ball valve FV05 is closed; the ball valve FV03 is then opened. Usually, an inlet pressure when slurry is transported by pipelines is often about 800kpa. At this time, the energy dissipater 1 will perform energy dissipation on the slurry at 800kpa transported by the main pipelines so as to balance the pressures between the two ends of the energy dissipating plate and make pressure differences between two ends of the third ball valve FV03 be zero. At this time, the second ball valve FV02 is closed to ensure that the inlet pressure of the main pump stays constant in the course of switching. When the independent mode is switched into the continuous pumping mode, the ball valves FV06 and FVO7 are opened; the ball valve FV05 is closed; the feeding pump 3 is initiated; the ball valve FV04 is opened; the ball valve FV03 is opened. Similarly, under the effect of the energy dissipating plate 2, the pressure differences between the two ends of the ball valve FVO3 are zero. Then, the ball valve FV02 is closed, the ball valve FV05 is initiated, and the switch is finished, thus ensuring that the inlet pressure of the main pump stays constant in the course of the switching. In view of above, not only when the continuous pumping mode is switched into the independent mode, but also when the independent mode is switched into the continuous pumping mode, the pressures at the two ends of the feeding pump 3 and the energy dissipating plate 2 are ensured to be consistent with the inlet pressure when the slurry is transported by the main pipelines, that is, the pressures of the feeding pump 3 and the energy dissipating plate 2 and the inlet pressure are all about 800kpa, so as to avoid that the maim pump stops protectively.

Claims

1. An energy dissipater used for undisturbed switching of operating modes of a multi-stage pump station, in the multi-stage pump station, a first ball valve (FVOl) and a second ball valve (FV02) are arranged between a forward-stage pump station and an inlet of a main pump; a third ball valve (FV03) is arranged between an output end of the first ball valve (FVO1) and an agitating tank/pool; a feeding pump ball valve (FV04) is arranged between an output end of the second ball valve (FV02) and a feeding pump (3), characterized in that, the energy dissipater (1) comprises an energy dissipating plate (2), an input ball valve (FV06) arranged at a front end of the energy dissipating plate, an output ball valve (FVO7) arranged at a back end of the energy dissipating plate, and a control ball valve (FV05), wherein the input ball valve is connected to an output end of the third ball valve (FV03), the output ball valve (FV07) is connected to one end of the agitating tank/pool, and the control ball valve (FV05) is arranged between the third ball valve (FV03) and the agitating tank.

2. The energy dissipater according to claim 1, wherein the energy dissipating plate (2) is a ceramic energy dissipating plate.

3. An undisturbed switching method for switching a continuous pumping mode into an independent mode of the multi-stage pump station by utilizing the energy dissipater according to claim 1, wherein the method comprises: initiating the feeding pump (3); opening the feeding pump ball valve (FV04), the input ball valve (FV06) and the output ball valve (FVO7) of the energy dissipating plate; closing the control ball valve (FV05); then opening the third ball valve (FV03), the energy dissipating plate (2) causing pressure differences between two ends of the third ball valve (FV03) to be zero; and then closing the second ball valve (FV02) to finish switching, ensuring that an inlet pressure of the main pump stays constant in the course of the switching.

4. An undisturbed switching method for switching an independent mode into a continuous pumping mode of the multi-stage pump station by utilizing the energy dissipater according to claim 1, wherein the method comprises: opening the input ball valve (FV06) and the output ball valve (FVO7) of the energy dissipating plate; closing the control ball valve (FV05); initiating the feeding pump (3); opening the feeding pump ball valve (FV04); opening the third ball valve (FV03), the energy dissipating plate (2) causing pressure differences between two ends of the third ball valve (FVO3) to be zero; and then closing the second ball valve (FV02), and opening the control ball valve (FV05) to finish switching, ensuring that an inlet pressure of the main pump stays constant in the course of the switching.