RU91143U1 - TORCH FLAME CONTROL DEVICE - Google Patents

Abstract

A flame control device comprising a pilot gas-air mixture ejector, a pilot gas-air mixture pipeline, a standby burner with a nozzle at the outlet of the combustion chamber, an electric candle, an impulse tube, a differential pressure switch, a gas supply pipe, characterized in that the combustible gas-air mixture ejector is connected with a standby burner.

Description

The claimed utility model relates to flame control devices for flare plants for burning emergency, continuous and periodic emissions of combustible gases and can be used in oil and gas, chemical and other industries.

A device for controlling a flame is described in the copyright certificate 254706 class. F23N 5/24,

The device comprises a combustion chamber, a pulse tube connected to the combustion chamber, a differential pressure switch, a fuel supply pipe.

Fuel enters the combustion chamber and is ignited. As a result of fuel combustion, combustion products are formed, the volume of which increases several times, and, consequently, the pressure in the combustion chamber increases.

Overpressure is created in the combustion chamber, which is transmitted through a pulse tube to a differential pressure switch located outside the zone of influence of the heat flux.

When the flame goes out, the pressure in the combustion chamber decreases to zero and the differential pressure switch signals the flame goes out.

However, this device is unreliable when transmitting a differential pressure signal over significant distances to a differential pressure switch located outside the thermal zone. The pressure drop practically becomes zero as a result of pressure loss in the impulse tube.

The specified disadvantage is eliminated in the device described in the journal Chemical and Oil and Gas Engineering 2007, No. 12.

The device contains an on-site burner located near the tip of the torch, an ejector unit (ejector of the ignition mixture and an ejector of the combustible mixture), an electric spark plug, a differential pressure switch located outside the zone of influence of the heat flux, pipelines of the ignition and combustible mixture that connect the on-site burner to the ejector block and a gas supply pipe.

The device operates as follows. Using the block of ejectors, a gas-air mixture is prepared, which enters through the pipelines of the combustible and ignition mixture into the combustion chamber of the standby burner.

After filling the gas-air mixture of pipelines, a spark is supplied from the electric spark, which ignites the ignition mixture. A traveling wave of a burning ignition mixture rises into the combustion chamber and ignites the combustible mixture. As a result of combustion, combustion products are formed, the volume of which increases several times. The burning gas exits through a nozzle in the combustion chamber of the standby burner. The nozzle cross-sectional area is calculated in such a way that there is increased pressure in the combustion chamber, and, consequently, the pressure increases both in the gas-air mixture supply pipelines and in the ejector, in which the pressure change signal with minimal losses is transmitted to the differential pressure switch located along the pulse tube next to the ejector.

Excessive pressure in the relay indicates the presence of a flame, and the absence of pressure indicates the extinction of the flame on the standby burner.

A disadvantage of the known device is the high metal consumption due to the diameter of the pipeline through which the prepared combustible gas-air mixture is supplied from the ejector located outside the zone of influence of the heat flow to the combustion chamber.

The ratio of the amount of gas to the amount of air needed to prepare the combustible mixture is 1:10, and, consequently, the diameter of the pipeline through which the combustible gas-air mixture is supplied from the ejector to the combustion chamber is much larger than the diameter of the pipeline through which gas is supplied to the ejector, therefore, the cost increases in the production of construction works.

The proposed utility model solves the problem of reducing the metal consumption of the device.

To achieve this goal, the device, as well as the prototype closest to it, contains an ejector with an ignition mixture pipeline, an ejector of a combustible mixture, an electric candle, an impulse tube, a differential pressure switch, a standby burner with a nozzle at the outlet of the combustion chamber, a gas supply pipe.

Unlike the known device, the ejector of the combustible mixture is connected to the standby burner.

Figure 1 presents the proposed device for controlling the flame of a torch.

The device comprises an ejector 1 for preparing an ignition gas-air mixture, a pipeline 2 for an ignition gas-air mixture, an ejector 3 for a combustible gas-air mixture, an on-site burner 4 with a nozzle 5 at the outlet of the combustion chamber 6, an electric candle 7, a pulse tube 8, a differential pressure switch 9 and a gas supply pipe 10.

The principle of operation is as follows. Gas enters the ejector 1, after air is ejected into the gas-air mixture pipeline, the volume in it increases by more than 10 times, and, therefore, its diameter must be several times larger than the diameter of the pipe through which the gas is supplied, and enters the combustion chamber 6 duty burner 4.

Another gas stream through the pipe 10 enters the ejector 3 connected to the combustion chamber 6 of the standby burner 4.

The gas after the ejector 1 is ignited by an electric candle 7.

A traveling wave of the burning ignition mixture rises into the combustion chamber 4 and ignites the combustible gas-air mixture prepared by the ejector 3 in the combustion chamber 6 of the standby burner 4.

As a result of combustion, combustion products are formed in the combustion chamber 6, the volume of which increases several times, and, consequently, the pressure increases. The rate of flow of gases from the chamber 6 with and without combustion is set using the nozzle 5 at the outlet, and the signal value is set by changing the ratio of the diameter of the chamber 6 and the diameter of the nozzle 5.

Since the diameter of the nozzle 5 is much smaller than the diameter of the chamber 6, the flow rate of the combustion products through the nozzle 5 is much greater than in the chamber 6.

This leads to an increase in pressure in the chamber 6, and, consequently, to an increase in the signal in the impulse tube 8.

The excess pressure in the chamber 6 through the impulse tube 8 is transmitted to the differential pressure switch 9, which ensures the transmission of a flame signal.

The connection of the ejector 3 with the standby burner 4 allows the proposed device to reduce metal consumption by supplying gas directly to the ejector 3.

Claims (1)

A flame control device comprising a pilot gas-air mixture ejector, a pilot gas-air mixture pipeline, a standby burner with a nozzle at the outlet of the combustion chamber, an electric candle, an impulse tube, a differential pressure switch, a gas supply pipe, characterized in that the combustible gas-air mixture ejector is connected with a standby burner.