Optimization operation of the jet device, located

on the suction line of the centrifugal pump
Dauletbaev B.U., Lee A.E.

M. Kh Dulaty Taraz State University

In modern conditions the treatment of circulating water and sewage are increasingly being used to install mono and vacuum hydro cyclones, providing high-performance and efficient capture of mechanical impurities with a minimum capture of mechanical impurities and the need for capital expenditure and production areas.

The prerequisites for the development of optimization of operating modes are applied and development work of the scientific school of A.A. Abrudaramanov in the field of hydraulics, hydro-cyclones and hydro cyclones pumping plants, ecology, environmental protection and rational use of natural and water resources.

It is known that to increase performance hydro cyclones, GTSNU and inkjet devices usually connect them to the battery [1,2,3]. Thus compounds may be both parallel and serial steps. Battery of GTSNU is widely used in many areas of water management. One of the schemes of work of such installations is presented in [4], where the two-phase slurry is sucked from the source pump and the pump under pressure is supplied to the battery of hydro cyclones. The hydro cyclone classification of solid particles occurs. Purified water from the solids drain pipes is given in a special tank, and the solid phase (enriched) through the sand hole hydro cyclones enters the common pipeline and transported to the place of further processing. This scheme works battery of GTSNU fraught with many disadvantages: intensive wear of the base of the pump and hydro cyclones; a significant water flow for transporting the solid phase (sediment) and clogging of nozzles for sand hydro cyclones.

A more perfect in terms of technology and cost-effective it is the battery of hydro cyclone vacuum pump unit (VGTSNU) with independent (separate) hydro elevators (Fig. 1). According to this scheme, two hydro cyclones are connected in series to the battery and disposed in the suction line of the centrifugal pump 1 to operate in vacuum mode, created by the pump separate hydraulic elevator 1 and 7.

Fig. 1. Battery hydro cyclone vacuum pump unit (BVGTSNU) with separate hydraulic elevator: 1 - centrifugal pump; 2 - hydro cyclone; 3 - pump suction pipe (drain pipe hydro cyclones batteries); 4 - the supply line of the original slurry; 5 - inlet of the hydro cyclone; 6 - penstock hydraulic elevator; 7 - hydraulic elevator; 8 - non-return valve; 9 - headroom; 10 - a source of slurry.

Naturally, such a scheme work hydro cyclones batteries have several advantages in comparison with the previous version: low wear of the base of the pump and hydro cyclones; the ability to control sediment. Use in practice with autonomous battery of VGTSNU hydro elevators became possible only after the development of vacuum hydro cyclones [5]. Further improvement of battery of VGTSNU is associated with hydro elevators sequential steps [6,10] (Fig. 2). An advantage of this embodiment compared to the previous are compact installation; efficiency in value terms (instead of 3 separate hydraulic elevator is only one) and the minimum number of control devices (valves, dampers). Even in 1967 A.A. Abduramanov and A.I. Zhangarin [7.8] hydro cyclone is the way to deal with sediment, where the slurry enters the hydro cyclones under pressure from an open water source (from the river) has been proposed. Purified water is sucked from the sediment core pump. It turns out that the classification of the slurry in hydro cyclones occurs in the pressure-vacuum conditions. Since battery hydro cyclone pump installations have improved all the time and in practice can be operated in the pressure, vacuum and pressure and vacuum conditions.

Fig. 2. Battery hydro cyclone vacuum pump unit (BVGTSNU) with hydro elevator sequential steps: 1 - centrifugal pump; 2 - hydro cyclone; 3 - battery hydro elevator sequential steps; 4 - suction pipe; 5 - supply line; 6 - inlet; 7 - water drain; 8 - suction pump; 9 - discharge pipe; 10 - discharge outlet; 11 - thickener (sand pipe); 12, 13 - the working of the nozzle ring; 14 - a central working nozzle; 15 - pulpit removal; 16 - non-return valve; 17 - receiving headroom; 18 - source of the slurry; 19 - a control device.

Hydro cyclone vacuum pump installation is a complex consisting of a pump, the hydro cyclone and hydraulic elevator (inkjet device). Hydraulic elevator is designed to provide at the mouth of the conical portion of the hydro cyclone vacuum sufficient depth to collect sediment and further transport it to the place of disposal. This process includes a condensed absorption in the mouth of the cone hydro cyclone sediment, first receiving chamber hydraulic elevator, and then mixing them with a working jet device, then transport the resulting mixture to the required distance. It is known that vacuum in the mouth of the cone depends on the coordinates of the hydro cyclone (the geodetic location) cone vertex (x, y, z) and the resulting slurry density (ρ), i.e. Ht.sch. = F (x, y, z, ρ).

The pressure on the radius is determined hydro cyclone by Abduramanov formula [9].

(1)

where, Pts - pressure near the wall of the hydro cyclone;

B - a constant, B = 0.36;

n - a quantity equal to 0.5;

ρzh - density of the liquid;
Vin - the speed of the incoming fluid in the hydro cyclone;

rts - hydro cyclone radius of the cylindrical portion.

After the conversion formula (1) with vacuum values has;

(2)

where, (H_r) _v - vacuum at radius r, m.v.st .;

(H_ts) _v - vacuum at a radius rts; m.v.st .;

Ay - the diameter of the hydro cyclone in this section;

ρzh, ρt - accordingly, the density of the liquid and solid phases.

At the mouth of the cone hydro cyclone r → rpes and (Hr) v → Hv.gts., so the formula (2) has the form:

(3)

For the removal of sediment accumulated in the mouth of the hydro cyclone chamber is used etektirovan effect their working stream.
The condition for the optimization of operating modes of the hydro cyclone and the jet device is the predominance of the value of the vacuum chamber in the hydraulic elevator reception than at the mouth of the conical portion of the hydro cyclone, ie.

(4)

Where, Hv.ge - the value of the vacuum in the receiving chamber hydraulic elevator;

Hv.ge = (Pge - Ra) / ρg;

Hv.gts - the value of the vacuum in the mouth of the conical portion of the hydro cyclone,

Hv.gts = (Pgts - Pa) / ρg;

Pge - the pressure in the receiving chamber of hydraulic elevator;

Pa - atmospheric pressure;

ρ - density of the slurry;

g - acceleration of a body in free fall.

In practice, there may be three cases:

deposits involved from the mouth of the hydro cyclone in the receiving chamber hydraulic elevator without interruption and then transported to a designated location;

deposits involved from the mouth of the conical portion of the hydro cyclone to a certain height, then they are absorbed hydro elevator;

receiving water from the chamber is absorbed into the hydraulic elevator hydro cyclone chamber, which is undesirable.

The criterion of hydro cyclone backing vacuum pump installations is

(5)

To ensure the normal operation of the vacuum pump hydro cyclone installations must be the criterion (5).

Literature:

1. Abduramanov A.A. One surface and two surface eddy hydroelevators. Analytical Review. CSTI Zhambyl, Taraz, 2006, 25 p.

2. Abduramanov A.A. Hydraulics hydro cyclones and pumping systems, part II, Almaty, "Science", 1993, 347 p.

3. Zhangarin A.I. Hydro cyclones, sand traps and water intakes of pulp lifting water installation of hydro cyclone receiving chamber. M., 1975, 31 p.

4. Abduramanov A.A. Mode of operation of the hydro cyclone to the centrifugal pump suction line. Diss ... cand. tehn. sciences, KazNIIE, Almaty, 1971.

5. Abduramanov A.A., Kasabekov M.I., Manakbaev B.K. Dynamics of development of GTSNU and their elements. In Proc. "VEDA: Teorie A praxe - 2008", Praha, Czech Republic, p. 29-33.

6. Prepatents № 20253 KZ. The jet pump, BI № 11, 2008 // A.A. Abduramanov, M. Bekishbaeva, Zh.E. Minarbekov.