RU90853U1 - VACUUM LIQUID TRANSMISSION SYSTEM BYPASS CHANNEL AND BYPASS CHANNEL DEVICE - Google Patents

Abstract

1. A vacuum system for pumping liquid through a bypass channel of a non-pressure pipeline, comprising a dry cam vacuum pump connected to a control system and configured to be connected to a vacuum column of the bypass channel through a control system. ! 2. The device of a bypass channel for pumping liquid of a non-pressure pipeline, characterized in that the bypass channel is made with a counter slope, its ends are immersed in the pumped liquid, while ensuring the liquid level at the beginning of the section is higher than at the end, and is equipped with a vacuum column at the upper point having the diameter is not less than the diameter of the bypass channel and the height is not less than 1.5 m with the vacuum system connected at its highest point according to claim 1, while a locking device is installed at the far end of the bypass channel.

Description

The utility model relates to construction and can be used in the repair, rehabilitation and reconstruction of pipelines.

At present, during accidents associated with non-pressure pipelines (breakthrough, physical deterioration, scheduled replacement, etc.), water pressure pumps are used for pumping through the bypass channel (see http://www.eng.rpi-inc.ru/materials /19/rpfmos2006/KondratievaSpeechRus.pdf, http://www.zevs-48.ru/index.php?id=34, http://www.merlin-igor.ru/d/wartbw195wind/index.html.) . This is an old design, proven over the years, but having its drawbacks, well known to public utilities: the need for large power cables; very high and constant electricity consumption by pressure pumps; low reliability due to contact of the working medium with the working surface of pressure pumps; great difficulties when working with pipelines of large diameters. 1-1.5 m. And more.

These problems can be solved using vacuum systems for pumping liquids through bypass channels, while obtaining the following advantages: the ability to remove liquids from pipelines of any diameters from a depth of 8 meters or more (provided that it is possible to create a “backwater” of the liquid column to a level of 7-8 m), minimal power consumption, no need to supply high-power power cables, lower maintenance costs, high reliability, multi-stage protection system, full automation of processes a.

Everyone knows the principle of communicating vessels: the equality of fluid pressures at the same height leads to the fact that in communicating vessels of any shape, the free surfaces of a resting homogeneous liquid are on the same level. Accordingly, in our case, it is necessary to connect two sections of the damaged pipeline using the bypass channel and let the water run. However, air in the bypass (Fig. 1) (air "plug") will interfere with which they are disposed of with the help of water pumps, "pushing" it further into the pipeline. Vacuum systems work on a completely different principle: they remove air from the pipeline, forcing water to fill the discharged space, thereby not wasting extra energy on fluid transfer (Fig. 2).

Thus, the essence of the first utility model is to create a vacuum system for pumping liquid through the bypass channel of a non-pressure pipe containing a dry cam vacuum pump 1 connected to a control system 2. The vacuum system is connected to the vacuum column 3 of the bypass channel through a control system.

The proposed vacuum system is based on modern dry cam vacuum pumps. These pumps have a corrosion-resistant coating on the working cavity and do not have wearing parts or working fluids. The use of oil or liquid ring pumps is unlikely, because in the first case the oil will mix with water vapor, which can lead to a breakdown of the system, and the latter require a supply of clean water. The use of oil-free pumps minimizes maintenance and guarantees a high level of reliability.

The system is completely autonomous: from the self-diagnosis process to the drying of the unit to remove condensate and prevent corrosion. Two-stage dust separator to protect the vacuum pump from dust and large amounts of water vapor.

This vacuum system is designed to provide vacuum pumping of non-explosive liquids (wastewater, etc.) through a bypass pipeline during rehabilitation or reconstruction of non-pressure pipelines.

Schematically, the vacuum system and the principle of its operation are shown in Fig. 3

A second utility model relates to the construction of a bypass channel using the inventive vacuum system.

The essence of the device of the bypass channel 1 for pumping liquid of a non-pressure pipeline is that the bypass channel is made with a contraclone, its ends are immersed in the pumped liquid, while ensuring the liquid level at the beginning of 2 sections is higher than the liquid level at the end of 3 sections and is equipped with a vacuum column 4 at the upper point having a diameter of not less than the diameter of the bypass channel and a height of at least 1.5 m with the vacuum system connected in the highest position, and a shut-off device is installed at the far end of the bypass channel oystvo 5.

The bypass channel device is shown in Fig. 6

Thus, for the operation of this system, it is necessary that the ends of the bypass pipeline are always under water, and the water level at the beginning of the section is higher than at the end. The start-up time of the pumpdown will vary depending on the volume of the bypass, the depth and the amount of leakage that cannot be avoided with large volumes of bypass. The system must be connected to the highest point of the vacuum column, which must be installed at the highest point of the bypass. The column must have a diameter of at least bypass and its height must be at least 1.5 m, counting from its outer diameter. Stop valves must be installed at the far end of the bypass. The system will work automatically. The vacuum system can work continuously. The system is adapted for operation at temperatures from -15 ° С to + 40 ° С

EXAMPLE:

A system model was assembled to demonstrate the principle of working with the following characteristics (Fig. 3):

Pipeline:

- Diameter - 50 mm.

Pressure water pump (to simulate fluid flow):

-Power - 0.4kW

- Productivity - 7 m ³ / hour Vacuum pump:

-Power - 0.1 kW

- Productivity - 3 m ³ / hour Working conditions:

- The pressure water pump works constantly, at full capacity, pumping water from one volume (one end of the pipeline) to another volume (the other end of the pipeline). The vacuum pump is connected through a monitoring system.

The results of the experiments fully confirmed the performance of the system. With sufficient tightness of the system, the vacuum pump was switched on only periodically to maintain the necessary vacuum. The energy consumption of the experimental vacuum system was 200 times lower than that of the submersible pump, which provides the same performance.

Of course, 200-fold savings are difficult to achieve at real facilities due to a number of objective reasons, but the energy consumption during vacuum pumping remains incomparably lower. Moreover, to ensure the operation of vacuum pumping, even on large bypasses, with a volume of 500-800 m ³ , a system with a capacity of 15 kW is enough.

It is not necessary to carry out any excavation work laying armored electric cables of high power, a conventional diesel generator is enough.

CALCULATION DATA

All the calculated data indicated below are obtained theoretically and may diverge from practical data.

1) The approximate time required to enter the operating mode with a sufficient amount of water (full filling of the bypass pipeline), where

V is the volume of the pipeline, including vertical parts, m ³

h - pipeline height + approximately 0.5 m for the vacuum chamber.

Pipeline, ⌀0.5 m.

The length of the pipeline, L 100 m.

Pipe height, h 6 m.

L is the horizontal part of the pipeline;

Lh - the vertical part of the pipeline

h (pipeline height) = h + 0.5 = 6.5

Looking at the time values graph (Fig. 4), we substitute the values of the obtained heights and volumes, we find that the time to enter the mode is approximately 200 seconds (the result must be taken at the maximum value).

2) Productivity, m ³ / hour:

The productivity of the vacuum pipeline depends on the height difference (h _P , m.) Between the ends of the pipeline and the diameter of the pipeline (⌀, mm.). Factors such as the resistance of the walls of the pipeline, viscosity were not taken into account.

The calculation was made using the “ideal fluid”, i.e. actual performance may be less.

Pipeline, ⌀500 mm.

The difference in levels, h _P 0.5 m.

Looking at the graph of productivity values (Fig. 5), we substitute the values of diameter and differential, we find that the maximum productivity is about 1000 m3 / h. (the result must be taken at the minimum value).

Claims (2)

1. A vacuum system for pumping fluid through the bypass channel of a non-pressure pipe, comprising a dry cam vacuum pump connected to a monitoring system and configured to connect to a vacuum column of the bypass channel through a monitoring system. 2. The bypass channel device for pumping liquid of a non-pressure pipeline, characterized in that the bypass channel is made with a counterclone, its ends are immersed in the pumped liquid, while ensuring the liquid level at the beginning of the section is higher than at the end, and equipped with a vacuum column at the upper point having the diameter is not less than the diameter of the bypass channel and the height is not less than 1.5 m with the vacuum system connected at its highest point according to claim 1, and at the far end of the bypass channel, a locking device is installed.