SU901419A1 - Method and apparatus for pumping-off liquid using air flow - Google Patents

Description

(5) METHOD FOR DEPLICATING LIQUID BY AIR FLOW AND DEVICE FOR IT

t

The invention relates to water supply, mainly from underground sources, and can be used in the testing and operation of hydrogeological wells.

The closest in technical essence and the achieved effect to the proposed is a method of pumping fluid from wells with a suction airlift (air flow).

The known method involves immersing the water-lifting pipe under the level of the pumped-out liquid, and introducing air from the atmosphere into the liquid being pumped through the water-lifting pipe. In this method, air is introduced above the water level and it is. It does not allow to regulate and restrict water input to the lifting column.

The closest in technical essence and the achieved effect to the proposed is a device for pumping fluid by air flow, including casing, the IMPLEMENTATION

lifting tube and vacuum apparatus 2.

A disadvantage of the known device is that it sinks in water and it is impossible to regulate the input of water into the water-lifting pipe.

The purpose of the invention is to increase the depth and productivity of pumping, ensuring a given producer -. pumping irrespective of the magnitude of the change in the water level in the borehole, the lack of reliability of the start-up process and the production of pumping, and the possibility of simultaneous measurement of the level of the fluid.

The goal is achieved by the fact that in the method of pumping water from a well, including the operation of immersing a water-lifting pipe under the level of pumped liquid, introducing air from the atmosphere into the pumped-through liquid, the pumped liquid is sprayed below the dynamic water level in the well

By introducing air into the lifting pipe, the V-volume concentration of the liquid in the air mixture is within the limits.

In order to implement the above method, a device is proposed for pumping a liquid by an air stream, including a casing string, a lifting pipe and a vacuum apparatus. The proposed device is equipped with a glass fixed on a water-lifting pipe, the upper part of which is located above the level of the liquid in the casing.

An example. To implement the proposed method of pumping water from a well, a GR-P water pump, a water-air ejector, a string of drill pipes with a diameter of 60.3 mm and a length of 40 m, a glass from a garden pipe with a diameter of 108 mm and a length of 12 m, a nozzle with a diameter of 12 mm are used. Static level water is 29 meters in the borehole 0150 mm. When the pump operates in the water flow mode of 0.003 and the pressure in kPa, the ejector creates an air flow rate of 0 m / s with a vacuum on the suction nozzle of the ejector 1.202 kPa. Pumping is performed for 21 hours, pumping capacity changes from 0.000816 MVc to 0.000683 m / s when the water level in the well changes during this time in m. The water-lifting column stands on the bedplate.

The use of the proposed method of pumping water from a well allows, in comparison with the known method, to ensure an increase in the depth and productivity of pumping, a reliable pumping process of constant productivity, and an increase in the accuracy of testing SKBZHINY by measuring the change in water level in a well by immersion of a lifting column during pumping.

In the known method, the pressure drop for lifting water by air flow

is determined

from condition

DRBB h h

- h.

BOD.ST 9,

de N - vacuum,

created by the ejector, m.vod, art., Almost H 8-9 m.vod.st. Accept N 9 m. Water. differential pressure, flow rate on the rise of water to the air flow, m.v.st. in conditions of a rapidly changing dynamic water level is 5m,

h., the pressure drop consumed to overcome the air flow resistances in the diaphragm, which plays the role of nozzles for introducing air from the atmosphere. Losses in it are great., Since the hole is small. With a large hole there will be no pressure to lift the water column,

V., Ta

-fCd

(QQ4 M

2

V

Q-- head loss during movement

W water-air mixture through a water pipe. According to the proposed method, the differential pressure for lifting water by air flow is determined from the condition

.pas. where H is the vacuum created by the ejector, m.vod.st. H 9 m.vod.st. head loss at the entrance to the inlet in the lift pipe, m.vod.st.

VЧh

Tv

2d

WU

ibx

working speed

air m / s

3

volume weight of air, kg / m 20 m / sJ

°° 1,2 2 kgf / m

one

2-9,81

Water flow rate raised by air

O. p0d stream, MVc

Flow velocity v

Lkd J

m / s

0.001

0.001

1.0 20.0

The volume concentration of water in the air flow is Tr, kg / m

The relative water content in the air flow p,%

 0. waters

Air flow Q

V05D m / s

Flow of air / water mixture, Q, + Q „3. VOZA eoA

The cross-sectional area of the water-lifting column si), m

The diameter of the column d, m

Loss of pressure on the rise of water for every 1 m of height f., Y N, kg

M2 Loss of pressure to overcome the forces of friction at C 1 m,

V

kgf

G;

2d m and

. n n (Jia 4. d Re

V, d

Re.

e. Y

K5 0.01 m; 2. Y 1, 06. / c

Total pressure loss at lift. water coming on 1 run. water

lift pipe Sh h,

kg / m

Operating pressure drop, kg / m

Extreme depth of pumping water from a well at a flow rate of 1 l / s

- p pqg

H

Zh

before

Maximum capacity for lifting water at a depth of 9 m

VOA-Gsm VO.d. Vc -TTj ,, calculated by selecting from the condition

dRrc1b- htfci d t. y- „-d; - ;, 2d

6

Table continuation

ten

0.1 0.051

0,0051 0,080

11.2 56

67.2 9000

13 "t

0,0010

0.020

7

The drawing shows a schematic diagram of the pumping of water from a well using the proposed device.

A device for pumping water from a nozzle 1, a cup 2, a lifting column 3. a water-air ejector k, an open cyclone 5, a tank 7 for collecting the raised water, a nozzle 6 for lifting the water, the suction line 8, the pump 9- Pumping device water is placed in the well 10. The design principle of the device will not change if pump 9 is replaced by a compressor (then pipeline 8 will end up in the atmosphere) or pump 9 and the ejector will be replaced by a vacuum pump or a high-pressure fan.

Pumping water from the squash is performed in the following sequence.

The static water level in the well 10 is measured. The water-lifting column 3 is assembled with the cup 2 and the nozzle 1 down to the static water level in the well. Connect the lifting column 3 to the ejector k. The pump 9 is switched on. After the working vacuum has been reached in the lifting column 3 and the steady flow of steady air movement is tired, the lifting column 3 is lowered into the water until it becomes buoyant. The depth of immersion of glass 2 in water is calculated in advance by the ratio of the weight of the column and the weight of the displaced water when it is immersed.

If there is a difference in the position levels of the nozzle 1 and the free surface of the water in the well, the WATER starts flowing through the nozzle 1 into the lifting column 3 The water entering the lifting pipe is determined by pressure H or the free surface of the water in the well 10 under the nozzle 1 and the outflow of water from the nozzle 1. Then the flow Q raised to the surface of the water will be equal to

Q cl / 2d

where / J - coefficient of discharge nozzle sl - cross-sectional area

the outlet nozzle H - water pressure; g is the acceleration of the force of gravity.

At the site of water splitting from the jet, an air flow is introduced, for example; through the perforation into the lifting column.

The air transports water to the surface in a sprayed state. A steady process of transporting water takes place when its volume concentration is 2-3 in the air flow. This is explained by the fact that at such a concentration the interaction of individual water droplets with each other in the air stream is minimized. In addition, it restricts the entry of water into the column and maintains the buoyancy effect of the column better when there is a sudden stop in air movement.

Claims (2)

1. A method of pumping liquid with air flow, including immersion of a lifting pipe under the level of pumped liquid, introducing air from the atmosphere into the liquid pumped through the lifting pipe, characterized in that, in order to reduce operating costs and increase the reliability and accuracy of hydrogeological testing of the well, pumped liquid is sprayed are below the dynamic water level in the well before entering the air into a water pipe, with V-. the volume concentration of the liquid in the water-air mixture is within 1: V 7/3%. 2. A device for pumping liquid with an air stream, including a well, a lifting pipe and a vacuum apparatus, characterized in that it is provided with a cup fixed on the lifting pipe, the upper suit of which is placed above the level of the liquid in the well and placed at the bottom of the lifting pipe. Sources of information taken into account in the examination 1. Rychagov V.V., 5 M. Florinsky Pumps and pumping stations, M., 1975 p. Uo. 2. Rychagov-8, V ,, Florinsky MM Pumps and pumping stations, M., 1975 p. 140 (prototype)