SU680752A1 - Apparatus for producing gas and air mixture - Google Patents

Description

(54) DEVICE FOR OBTAINING A GAS AIR MIX

I

The invention relates to gas supply and can be used as the main source of gas supply to settlements and industrial enterprises.

A device for producing a gas-air mixture, a constant composition and pressure, is known, consisting of a compressor for compressing air, a proportional valve for mixing gas with air, air and gas pressure regulators, air and gas flow regulators, as well as command devices 1J.

The main disadvantage of such a device is the presence of an air compressor which requires a considerable amount of energy and complex maintenance.

It is also known to have an ejection device for obtaining a gas-air mixture of constant composition and pressure, consisting of an ejector, a gas pressure regulator installed in front of the ejector, and a variable volume regulating tank, according to the type of "wet gasholder installed after the ejector 2.

In this device, performance control is carried out by a quantitative method. The operation mode of the ejector is two-position “on / off. The disadvantages of this device are the presence of bulky moving gasholdernoy capacity and frequent switching of the ejector. The presence of a moving bell requires high accuracy in the manufacture of sheet structures, and also reduces the reliability of the installation. The presence of moving contacts requires systematic preventive maintenance and frequent replacement of parts.

The closest solution to the technical essence of the achieved result is a device for producing a gas-mixture with piping and an ejector consisting of an active gas nozzle, an air nozzle with a damper, a mixing chamber and a diffuser, as well as two direct-acting gas pressure regulators connected pipelines with active nozzle and diffuser 3.

In the nozzle of the active gas, changing the area of its outlet orifice, the regulating needle connected by a rod with a diaphragm pneumatic actuator moves. The diaphragm pneumatic actuator is connected by impulse piping to the flow diaphragm installed in the gas-air mixture pipe after the ejector.

The disadvantage of this device is low operational reliability due to the difficulty of articulating the diaphragm actuator with air damper (due to the complex cam profile of the diaphragm actuator), as well as the need for constant operational monitoring of the thoroughness of this connection, because in the course of operation the lever system is a backlash, which leads to a change in the composition of the gas-air mixture. The disadvantage of this device is also the impossibility of unification, because the introduction of a needle into the active gas nozzle changes the entire aerodynamic characteristic of the ejector, which makes it necessary to determine experimentally the characteristics of the ejector and the operating modes of the A / F valve in each particular case. In addition, such a device is unreliable in regulation with low gas flow rates, i.e. with a large degree of overlap of the nozzle with a regulating needle.

To increase the operational reliability, simplify and standardize the device for obtaining a gas-air mixture of constant composition and pressure, the proposed device contains a pressure regulator with a control device and a valve-corrector, connected via pipelines with a nozzle and diffuser, respectively, and having impulse lines, while the imp. The pressure control line is connected to the pipeline after the valve-corrector, and the valve-corrector pulse line is connected to the pipeline after the pressure regulator.

The drawing shows schematically an apparatus for producing a gas-air mixture of constant composition and pressure.

This device has pipes 1, an ejector 2 consisting of an active gas nozzle 3, an air nozzle 4, a mixing chamber 5 and a diffuser 6. The device is equipped with a gas pressure regulator 7 with a control device and a corrector valve 8 connected via pipelines 1, respectively nozzle 3 and diffuser 6 and having pulse lines 9, 10. At that, the pulse line 9 of the gas pressure regulator is connected to the pipeline 1 after the valve-corrector 8, and the pulse line 10 is connected to the pipeline I after the gas pressure regulator 7.

The device works as follows.

With an increase in the gas-air mixture consumption and, consequently, a decrease in pressure in the pipeline 1 after the ejector, the gas pressure regulator 7 opens slightly and increases the gas pressure in front of the active nozzle 3. Thus, the pressure of the gas-gas mixture is kept constant. At the same time, the increase in gas pressure in front of the active nozzle 3 is transmitted through the impulse line 10 to the actuator of the corrector 8, causing it to

cover and increase its hydraulic resistance so as to maintain a constant composition of the gas-air mixture.

The proposed device possesses high operational reliability, simplicity of design and maintenance, since it does not have a complicated structural device — a regulating needle with a pneumatic actuator, and also does not have complex systems of articulation of individual elements. The proposed device allows unification, since it consists of elements that are standard equipment suitable for different capacities and operating conditions of the device.

Claims (3)

1. US Patent No. 3233987, cl. 48-180 1966. 2.Astakhov V.A., Itzykson B.S. Automated installation for propane-air mixture- “News of oil and gas equipment, series“ Gas business, GOSINTI. M., 1962, No. 5, 46-50. 3.Sig-mund Karl Vollatstop atische enjeks tormischer fur gasformige Kohlenwassersto / fe Erdok und Kohle, 1962, 15 No. 7 ss. 553-556. / // R