RU56561U1 - TORCH CONTROL DEVICE - Google Patents

Abstract

The inventive utility model relates to devices for controlling the flare of plants for burning emergency, continuous and periodic emissions of combustible gases and can be used in oil and gas, chemical and other industries. The device comprises a combustion chamber 1, the output end of which is equipped with a nozzle 2, a pulse tube 3 attached to the fuel supply pipe 4, a differential pressure switch 5 and a pipeline for supplying the ignition mixture 6 with an electric candle 7. The proposed utility model solves the problem of increasing the signal in the pulse tube due to pressure increase in the combustion chamber, with a nozzle installed on the output end and a pulse tube located outside the thermal zone next to the differential pressure switch.

Description

The inventive utility model relates to devices for controlling the flare of plants for burning emergency, constant and periodic emissions of combustible gases and can be used in oil and gas, chemical and other industries.

A device for controlling a torch comprising a combustion chamber, a sensor of refractory elements placed in a combustion zone, a filter for suppressing interference of industrial frequency, an actuator is known.

The principle of operation is to use the control component of the conductivity of the flame during normal combustion. Control is carried out using an ionization sensor with a filter (see AS 118569, CL 24 vol. 3).

A disadvantage of the known device is the complexity of the hardware implementation.

The specified disadvantage is eliminated in the device described in the copyright certificate 254706 cells. F 23 N 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 via a pulse tube to a differential pressure switch.

When the torch goes out, the pressure in the combustion chamber decreases and a differential pressure switch is registered, the signal about the end of the torch.

However, this device is unreliable due to the small size of the signal.

This is because the increase in pressure in the combustion chamber is due to an increase in the rate of gas outflow from the combustion chamber due to an increase in the volume of gas obtained during combustion compared with the rate of outflow of gas from the combustion chamber in the absence of combustion. When transmitting the differential pressure signal to a considerable distance to the differential pressure switch located outside the thermal zone, it practically becomes equal to zero as a result of pressure loss in the impulse tube.

Requirements for the placement of all automation elements outside the thermal zone leads to an extension of the impulse tube. This is especially evident in high-power fuel-burning devices with a radius of the heat-affected zone of up to 60-100 m.

The proposed utility model solves the problem of increasing the signal in the pulse tube by increasing the pressure in the combustion chamber, with a nozzle installed at the output end and a pulse tube located outside the thermal zone next to the differential pressure switch.

To achieve this goal, the torch control device contains, like the prototype closest to it, a combustion chamber, an impulse tube, a differential pressure switch, a fuel supply pipe.

Unlike the known device, the combustion chamber at the outlet of the torch is equipped with a nozzle, and the impulse tube is attached to the fuel supply pipe outside the thermal zone.

Figure 1 presents the proposed device for controlling the torch.

The device comprises a combustion chamber 1, the output end of which is equipped with a nozzle 2, a pulse tube 3 attached to the fuel supply pipe 4, a differential pressure switch 5 and a pipeline for supplying the ignition mixture 6 with electric light 7.

The principle of operation is as follows.

Fuel through the pipeline 4 enters the combustion chamber 1 and is ignited by the ignition mixture from the pipeline 6. The ignition mixture is ignited by the electric candle 7.

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 1 increases. Excessive pressure through the impulse tube 3 is transmitted to the differential pressure switch 5 (signal about the presence of a torch).

When the flame goes out, the pressure in the combustion chamber 1 decreases and the differential pressure switch 5 fixes its extinction.

Due to the presence of a nozzle 2, a limited volume is formed at the end of the combustion chamber 1. The flow rate of the combustion products from the combustion chamber 1 when burning and without burning fuel is set using the diameter of the nozzle 2 at the outlet of the combustion chamber, and the signal value is set by the ratio of the diameter of the combustion chamber 1 to the diameter of the nozzle 2.

Since the diameter of the nozzle 2 is much smaller than the diameter of the combustion chamber 1, the flow rate of the combustion products through the nozzle 2 is much greater than in the combustion chamber 1. This will increase the pressure in the combustion chamber, and, consequently, increase the signal in the pulse tube by several tens of times compared with the known device.

The fastening of the impulse tube 3 to the fuel supply pipe 4 outside the thermal zone of the flame sharply reduces the length of the impulse tube to the differential pressure switch 5.

Claims (1)

A torch control device comprising a combustion chamber, a fuel supply pipe, an impulse tube, a differential pressure switch, characterized in that the outlet combustion chamber is provided with a nozzle that determines the signal value using the ratio of the diameter of the combustion chamber to the diameter of the nozzle, and the impulse tube is attached to the inlet the fuel pipeline outside the thermal zone.