Horizontal flare UFBG-50/100/150-G is designed to burn periodic and emergency discharges of methanol and gas condensate aqueous solution in an open site.
Main parts of UFBG-50/100/150-G
- fuel gas treatment unit (BPG),
- control rack,
- ignition control panel (PR),
- pilot burners,
- operator panel cabinet (ShPO).
Operating principle of horizontal flare UFBG-50/100/150-G
The flare is a frame with the following attachments:
- heatproof shield,
- collector Du65 – 1 pc.,
- collector Du100 – 1 pc.,
- collector Du150 – 1 pc.,
- pilot burners – 2 pcs,
- burner nozzle – 2 pcs,
- high voltage source (IVN) – 2 pcs,
- IVN rack – 2 pcs,
- terminal block – 3 pcs.
The frame is made of 09G2S steel. The shield is made of heat-resistant steel 20X23H18 and reflect the heat stream during combustion of combustion discharge products in the flare, thereby protecting the equipment from thermal radiation.
Collector Du65 is designed to separate the discharge liquid into two streams. The collector has one inlet nozzle with flange connection and swivel plug and two outlet nozzles with flange connection.
Collector Du100 is designed to divide the gas flow into two pneumatic nozzles. The collector has one inlet nozzle, on which the check valve with flange connection and swivel plug are installed, and two outlet nozzles with flange connection. The check valve is designed to prevent air from filling the gas supply line and the formation of an explosive mixture.
Collector Du150 is designed to separate the gas flow to two atmospheric burners. The collector has one inlet nozzle, on which the check valve with flange connection and swivel plug are installed, and two outlet nozzles with flange connection. The check valve is designed to prevent air from filling the gas supply line and the formation of an explosive mixture.
Pilot injector burners are designed to ignite of the main burners and must operate continuously. Flange connections with rotating plugs are provided for connection to the fuel gas supply lines.
Racks are designed for mounting high voltage sources; the voltage is supplied to the electric spark plugs installed on the pilot burners.
The burner nozzle is a combined device made of corrosion-resistant and heat-resistant materials. The nozzle allows to dispose of gases and liquids from three discharge sources simultaneously.
The burner is the main unit of the flare. The burner includes systems for disposal of gas condensate/water methanol solution, fuel gas to the pneumatic nozzles and discharge gas to the atmospheric burner. When burning gas condensate/water methanol solution, it is necessary to supply fuel gas to the pneumatic nozzle. In case of incomplete burning of the liquid fraction, increase the gas flow to the pneumatic nozzle.
The pilot injector burner is designed to ignite of the main burners and must operate continuously. An electric spark plug is used to ignite the pilot burners. A thermocouple located inside the pilot burner in a special pocket and is used to monitor the flame presence. The gas-air mixture for stable combustion is formed inside the burner.
To ensure the stable operation of the duty burners, it is necessary to provide the fuel gas supply with the required pressure. To reduce the fuel gas pressure to 0.07 MPa, a fuel gas treatment unit is installed on the line in a heated cabinet.
Fuel gas treatment unit (BPG) is an insulated cabinet with electric heating with a fuel gas reduction and preparation unit for pilot and ignition burners.
Pressure reduction unit includes ball valves, gas filter, pressure regulator, safety relief valve, solenoid valves, valve blocks, indicating pressure gauge, and electric contact pressure gauges. The ignition gas of the pilot burners is supplied to the BPG through the inlet nozzle and the main shutoff ball valve. Then the gas is purified from mechanical impurities at the gas filter. Gas purified from mechanical impurities passes to the pressure regulator inlet, where the gas pressure decreases from 0.28...0.32 MPa (excess) to 0.07 MPa (excess) in one stage.
A common drain line with a ball valve is provided to remove impurities, deposits, and liquid fraction from the gas fuel line. A rotameter with bypass line is installed after the pressure regulator to control the gas flow to the pilot burners. After the rotameter, the gas flow is divided into two lines: the ignition burner line and the pilot burner line. A solenoid shutoff valve is installed on each line to provide remote control of the burners (switching on and off). If the solenoid valves break down, a bypass is provided for each of them with a ball valve installed.
The instrumentation used in the BPG:
for remote control of fuel gas pressure before the pressure reduction unit — electric contact pressure gauge with the signal output when the minimum and maximum gas pressure is reached, which is installed after the main shutoff ball valve;
for remote control of fuel gas pressure before the pilot and ignition burner — electric contact signaling pressure gauge with the signal output when the minimum and maximum gas pressure is reached, which is installed after the gas separator;
for fuel gas flow control in the BPG— rotameter;
for remote control of the ambient temperature in the BPG unit— temperature sensor;
for controlling the gas contamination in the unit — gas analyzer.
The equipment installed inside and outside the unit is explosion-proof (Exd type).