Multi-stage airlift

 

The invention is intended for use in energy, construction and mining industries. Airlift contains stage. Receiving tank each stage, beginning with the second, provided by the vertical pipe. The lower end of the latter communicates with the cavity of the inlet tank. The upper end of the vertical pipe communicated through the throttle device to the atmosphere. The height of each vertical pipe is always greater than the height of the riser pipe of the preceding stage. The lower ends of the vertical pipes of the first two or three stages are located on the same horizon. Provides manual lifting water from shallow scoops, reduced energy costs on the rise of one unit fluid. 1 Il., table 1.

The invention relates to a device for lifting the fluid to the surface from underground utilities with limited recesses in the area of water collection, namely the multi-stage airlift, and can be used in energy, agriculture, metallurgy, construction, mining and other industries.

Known low-pressure water lift [1], containing fence, pressure and gas pipes, the work is GEOBRASIL channel, informing the bottom area of the inner Cup and the annular cavity between the glasses. The disadvantage of this device is the cyclical nature of its work, and in case of small cavities intake pipe must have device for one-way passage of fluid, which reduces the cost, complicates the conditions of maintenance and operation of the lift.

Known lift-phase medium [2], containing the reservoir, coaxial tubes mounted one within the other with the formation of the annular channel, the bottom of which is placed in the tank and is equipped with a ring mixers connected to the source of the active medium. The disadvantage of this lift is to reduce the effectiveness of its work as emptying the tank and lower it to the level of a liquid medium.

Known multi-stage pneumatic water lift [3], which contains a working camera with the suction holes, the discharge piping connected with cameras, and installed sequentially, one after another, air piping connected to the pressure source, while the working chamber is provided with the intakes, made in the form of cylinders with check valves.

This solution allows you to pump in which operates in a cyclic mode, requires additional service distribution device, and a system of valves and membranes.

Closest to the claimed invention is a multi-stage airlift [4], containing steps, each of which is executed in the form of a riser pipe with a mixer and air-purge drum with a storage capacity associated using a top-down pipe with receiving tank next level.

However, the airlift has inherent adopted design drawbacks, such as difficulties with pumping water from shallow water collectors installed in hard to reach for their development and deepening of places, and incomplete provision of devices for smoothing down the pipelines of water level fluctuations, which leads to waste of energy and, as consequence, to decrease in efficiency of the whole plant in General. Additionally, the prototype for automatic distribution of compressed air into the steps of the airlift is not provided visual or other monitoring and adjustment of operating modes, which complicates the conditions of operation and maintenance.

The technical effect of the offer from the bones of drains with small depths. This effect is achieved in that the receiving tank at each stage of the airlift, starting with the second, provided with a vertical pipe, the lower end of which is communicated with the receiving cavity of the tank, and the upper end, through the throttle device, with the atmosphere and the height of each vertical pipe is always greater than the height of the riser pipe of the preceding stage, and the lower ends of the vertical pipes of the first two or three stages are located on the same horizon, and the lower ends of the vertical pipes of the other subsequent steps on another constant horizon, for all levels comply with the terms of the constancy of the coefficient of lift of hydroaromatic, that is, kz=hP1/h1=hP2/h2=......=hp/hzi, (1) where kz- coefficient of lift hydroaromatic; hp- lifting height of liquid i-th step, i.e. the difference in the geometric marks the top end of the i-th of the riser pipe and the water level in the i-th vertical pipe, and for the 1st level in the sump, m; hzi- the amount of penetration of the i-th step, i.e. the difference in the geometric elevations of the water level in the i-th vertical pipe and the horizon of the upper tier aerating nozzles in the i-th mixer, starting with the second, but for the 1st Stratulat of the invention is expressed in the providing step of lifting fluids from shallow scoops equal for all steps given specific costs aerating air to create hydroaromatic, in the damping of the amplitudes of the pulsations of the water flow, which reduces wasteful energy consumption on the rise of one unit fluid, as well as the ability to perform visual or other control efficiency of each stage.

Generally, the proposed multistage air lift pump is designed for pumping liquids or solids from flooded drains, infiltra galleries, underground canals, etc., to a height of not more than 10-25 m And, in most cases, the lowest point of the catchment (natural depression, a sump, a longitudinal gutter and so on) is removed from the vertical drift, leaving the surface, and, for a number of reasons, there is no possibility to perform the necessary deepening at the point of the catchment. Therefore, the underlying assumption in the calculation of the airlift is available depth at the point of the catchment area N, which is typically 0.3-0.5 m, depending on the design of the intake and mixer, the estimated penetration of the 1st stage of the airlift h1will be slightly less disposable depth of the sump H, but it ultimately is the starting point for hydraulic calculation of multi-stage airlift.

Empirically poster installation of the airlift for the range of his proizoditelnostyu dependence of the form:= akinz, (2) where- the results of the specific air consumption for a range of the above performance on the water, nm3/m3; kz=hp/hC- coefficient of lift airlift; hpthe experimental height of the riser pipe above the surface of the water (hp=0,15-1,66 m);
hC- the amount of penetration to allow the head from a free water surface to the top tier aerating nozzle mixer (hC=0,2-0,4 m);
and the empirical coefficients (a=7,2-15,5; in=1,05-1,25).

According to [5] , [6] (for airlifts with unlimited depth) and content of bench tests (for airlifts with limited depth) determined that the most effective operation of the airlift is observed when kz= 0.5 to 1.0.

For each situation the constructive arrangement of the steps of the airlift is performed individually, but with all the diversity the implementation of this technical solution, the determining factors are how the selected link when the level of water the first steps of the shallow of jumptv and effective damping of the pulsations of costs in subsequent stages of the ascent.

In the constructive don't think about for the first stage does not exceed 55-70 mm, and in the upper part of the lifting tubes protrude above the bottom of storage tanks 25-30 mm, All this ensures a reliable one-way flow of hydroaromatic in each stage.

For tracking and visual observations of the fluctuations in vertical pipes as an alternative solution can serve as a glass of water measuring tube length of 0.5-1.0 m, and as a throttle device of the air valve on the removable cover each vertical pipe, under the cover can be installed in the air space inside the upper part of the vertical pipe adjustable volume, in the form of glasses, to configure a particular stage under its own anticastro hesitation.

The drawing shows a diagram of the multi-stage airlift, longitudinal section. Airlift contains steps, each of which is made in the form of the lifting tube 1 with 2 mixers and vozduhoohladiteli 3 cumulative 4 tanks connected by means of the descending pipes 5 with receiving tank 6. Catch basins 6, starting from 2-tier provided by the vertical pipes 7 with throttle device 8. Each mixer 2 summed up the pipes 9 from the remote distribution of compressed air 10.

The entire multi-uh the Ah 6 are located on the same horizon, while the coefficients of the rise of kzall levels are equal. Groups of interconnected horizontal conduits 11, with group 1 consisting of 2-3 degrees, placed directly in the sump 12 (sump, ditch, deepening, and so on), located at the lowest elevation of dewatering structures.

Multi-stage airlift operates as follows. From the remote distribution of compressed air 10 through pipelines 9 serves compressed air with the appropriate parameters for each stage, and then in the mixer 2 is formed hydrogenosomes, which moves upward on lifting pipes 1, deaeribed in vozduhoohladiteli 3 and later in solid phase, through the accumulation tank 4 and downstream piping 5 is fed into the receiving tank 6. Foster tanks for the first stage is the sump 12 depth N.

As it is filled treads water in the water glass (not shown) of the vertical pipes 7 by changing the air supply index levels of the pillars of the liquid corresponding to the calculated h1h2hsand so on, and adjustable throttle device 8 extinguish unwanted oscillatory processes. After lifting hydroaromatic on proect is in the discharge conduits for subsequent transportation.

Examples of the calculation of the multi-stage airlift below.

Example 1. You must build a multi-stage airlift in a horizontal roadway (see drawing, group I) with a lifting height of water 1.6 m from the sump to the magnitude of penetration h1=0,4 m

For different values of number of stages particle=1-7 by the method of successive approximations determine the magnitude of the increment of rise for each stephpassuming constancy of the coefficient of lift of kzin each combination of particle. Using the dependence (2) calculate the optimal consumption of air. The results of the calculations are shown in the table.

Analysis of the calculated data shows that with increasing number of stages total consumption specific consumption of air decreases and asymptotically final layout after taking technical and economic calculations, taking into account the possibility of placing the group stages in the existing sump.

Example 2. You want to determine the number of steps airlifting installation with kz= 1,0, consisting of two groups of stages, when the level of water at 10.0 m from the sump to the magnitude of penetration hz1 cumulative capacity at all levels is ignored.

a) I group (the sump away from the vertical drift)
h1=0.45 m;
h2=h1+hP1=0.90 m;
hP1=h1kz=0.45 m;
hP2=h2kz=0.90 m;
b) II-group levels (on the floor in the projection of the vertical drift)
hs=h2-0,45+hP2=1.35 m;
hS4=hs+hP3=2.70 m;
h5=hS4+hA4=5.40 m;
hP3=hskz=1.35 m;
hA4=hS4kz=2.70 m;
hP5=h5kz=5.40 m;
C) the total height of the liquid airlifting installation is hP5+h5= 10,8 m, that is, to solve the problem is rather five of airlift or particle=5.

Thus, the proposed design of multi-stage air pump allows you to pump out the fluid drains with small depths with pre-specified cost, and the available control modes each stage improves the conditions of operation.

Currently, Krasnoyarsk CHP-2 developed detailed documentation of the multi-stage airlift and is alternately snap Paciornik water.

Sources of information
1. Low-pressure water lift. N. In. Lisovsky. USSR author's certificate 1712670, CL F 04 F 1/12, application 4782735/29 from 04.12.89,

2. Lift the two-phase environment. G. M. Maslov. Patent of the Russian Federation 2002126, CL F 04 F 1/00, application 4834892 from 05.06.90,

3. Multistage pneumatic water lift. B. C. Wojciechowski and other Patent of the Russian Federation 1831591, CL F 04 F 1/12, application 5023728/29 from 05.09.91,

4. Multi-stage airlift. C., Geyer, and other USSR Author's certificate 909346, M CL3. F 04 F 1/18, application 2820113/25-06 from 24.09.79,

5. Smondyrev A. E. Hydro - and pneumatic transport in metallurgy. - M.: Metallurgiya, 1985 - 280 S.: ill.

6. Tsiklauri D. C. Hydraulics, agricultural water supply and hydropower installation. - M.: Stroiizdat, 1970. - 256 S.: ill.


Claims

Multi-stage airlift containing steps, each of which is executed in the form of a riser pipe with a mixer and air-purge drum with a storage capacity associated using a top-down pipe with receiving tank subsequent stage, wherein the receiving tank each stage, beginning with the second, provided with a vertical pipe, the lower end of which is communicated with the cavity priemnoi always greater than the height of the riser pipe of the preceding stage, moreover, the lower ends of the vertical pipes of the first two or three stages are located on the same horizon, and the lower ends of the vertical pipes of the subsequent steps is another constant horizon, for all levels comply with the terms of
kz=hn1/h31=hn2/h32=.......=hni/h3i,
where kz- coefficient of lift hydroaromatic;
hni- lifting height of liquid i-th stage, i.e., the difference in the geometric marks the top end of the i-th of the riser pipe and the water level in the i-th vertical pipe, m;
hn1- lifting height of liquid 1-th stage, i.e., the difference in the geometric marks the top end of the 1st riser pipe and the free surface of the water in the sump, m;
h3i- the amount of penetration of the i-th stage, i.e., the difference in geometric elevations of the water level in the i-th vertical pipe and the horizon of the upper tier aerating nozzles in the i-th mixer, m;
h31- the amount of penetration of the 1st stage, i.e., the difference in geometric levels of free water surface in the sump and the horizon of the upper tier aerating nozzles in the mixer 1-th stage, m;
i= 2, 3, 4, . .. - ordinal levels, are equipped with vertical pipes.

 

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