RU2403506C1 - Method of fan operation control - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: proposed method comprises controlled air inflow. Note here that said controlled air inflow occurs between first and second stages of the fan.

EFFECT: lower power consumption.

1 dwg

Description

The invention relates to fan installations with two-stage axial fans and can find application, in particular, on the main and auxiliary fan installations of mines, mines and other ventilation objects.

There is a method of regulating the operation mode of mine fan systems with two-stage axial fans working for suction, creating an artificial air intake, and when working for injection, increasing leaks. At the same time, the amount of air passing through the fan increases, and at the same time its intake into the shaft decreases (see, for example, [1], p. 72, [2], p. 66, 93-94). This method of regulation is used when the use of other known methods for some reason is impossible or impractical.

The method allows for the operational change of the ventilation mode, however, its use is associated with energy losses, which can be approximately determined by the following formula:

where Q _P - the amount of sucked air, m ³ / s;

H ₀ - pressure created by the installation, Pa; H ₀ = H ₁ + H ₂ ;

H ₁ - pressure developed by the first stage;

N ₂ - pressure developed by the second stage;

η is the efficiency of the installation.

The objective of the invention is to reduce energy costs for regulating the fan installation by creating an artificial air leak.

To solve this problem, two-stage fan installations with axial fans working on the suction, carry out the suction of the air flow between the first and second stages of the installation.

The essence of the proposal is illustrated in the drawing, which schematically shows a fan installation that implements the proposed method of regulation.

The installation contains two pressure stages 1 and 2, a supply pipe 3 and an outlet with a gate 4 for air intake after the first stage. In this case, the first installation step can be either the first impeller of a two-stage fan unit, or the first single-stage axial fan, if the unit consists of two series-connected single-stage axial fans. The dashed line shows the tap with gate 5 during the implementation of the method of controlling a controlled air intake at the inlet of the first stage, as is implemented in the adopted prototype.

при использовании предлагаемого метода можно приближенно определить по следующей формуле:Regulation energy loss

when using the proposed method can be approximately determined by the following formula:

where Q _P - the amount of air sucked up after the first stage, m ³ / s;

η ₁ , η ₂ - respectively, the efficiency of the first and second stage.

If we take as a first approximation that η ₁ = η ₂ = η, taking into account (1) and (2), the reduction of energy losses for regulation in the second case (when air is sucked into the second stage) can be determined by the formula:

As follows from the last formula, the energy loss for regulation when using the proposed method is lower in comparison with the known regulation method.

Literature

1. Borisenko K.S., Borumensky A.G. et al. Mining mechanics: Textbook for universities. - M .: Gosgortekhizdat, 1962. - P.72.

2. Geyer V.G., Timoshenko G.M. Mine fan and sump installations: Textbook for high schools. - M .: Nedra, 1987. - P.66, 93-94.

Claims (1)

The method of regulating the operation mode of a two-stage fan installation with an axial suction fan controlled by air intake, characterized in that air is sucked between the first and second stages of the installation.