FM Series Low and Medium Velocity Gas, Oil and Combination Burners February 2012 FM Series Features Low or medium velocity burner versions Suitable for liquid or gaseous fuels Simple conversion from gas to oil or oil to gas no lance removal required. Low air and gas pressures Standard air preheat temperatures to 350 C Option of air preheat temperatures to 600 C Excellent flame stability These large capacity burners utilise a series of different stabilisers in common bodies to provide a wide variety of application capabilities. The burner performance may be optimised over a range of conditions by selecting the appropriate baffle / flame stabiliser for the required duty. For example, combustion air pressures as low as 10 mbar can be accommodated without compromising mixing characteristics. These properties are important, for example, where low CV gases are to be burnt. The burners are available in three design styles: The RFM burner comprises of a refractory air baffle of a simple design that is useful for applications where simplicity and ruggedness are important. The RFM can accept high furnace temperatures, with air preheat temperatures up to 350 C (standard) and is for gas firing only. The burner capacity is based on the air flow resulting from the air temperature and pressure drop across the baffle. A choice of baffle bodies in each body is available see capacity chart for details. The AFM burner has been developed for use with gas and light oil and offers an alternative to the RFM series, where combustion air pressures are low, for applications where burner turndown and air/gas mixing are important. Each burner air baffle is individually designed to suit the application. The AFM uses a refractory lined alloy baffle and is for gas or light oil firing. The baffle can resist high furnace temperatures and accept air preheat temperatures up to 350 C (standard). The burner capacity is based on the air flow resulting from the air temperature and pressure drop across the baffle. A choice of baffle bodies in each body is available see capacity chart for details. The RFM and AFM burners are available with two gas lance options: the A type gas lance is a simple tubular construction whilst the B type gas lance uses a moveable gas disc which is used to give on site adjustment of flame characteristics. The AFM series oil atomiser uses medium pressure compressed air and is easily inserted and withdrawn along the centre of the B type gas lance for cleaning and maintenance. The SFM burner incorporates a swirl type flame stabiliser that has been developed primarily for use with gas or liquid fuels. Gaseous fuel is supplied through the centre lance to a number of fuel nozzles, arranged concentrically around the lance. The burner is designed for high or low pressure gas, light oil or dual fuel firing. Maximum furnace temperatures of up to 1,200 C are acceptable with preheat temperatures up to 350 C refer to FivesNA for applications with higher temperatures. Between the fuel lance and gas nozzles is a spinner assembly to rotate the combustion air. Also, the air inlet of the burner incorporates a spinner vane to impart a rotation to the incoming air to influence the flame swirl and length. Air Preheat Temperatures All standard burners are designed for preheated combustion air with temperatures up to 350 C. Special burners suitable for air preheats up to 600 C are available contact FivesNA. At air preheat temperatures up to 250 C; the burner body may need to be externally insulated. Over 250 C, the burner body is provided with internal insulation, resulting in typical body surface temperatures of up to 70 C. It should be noted that the air inlet will be restricted and it may be necessary to use a burner one size larger please refer to FivesNA. In all cases where air is preheated, it is the duty of the purchaser to ensure that the air ducting and burner body are suitably guarded for personnel protection. Heath Mill Road, Wolverhampton WV5 8BD England Tel +44 (0) 1902 891200 Fax +44 (0) 1902 895552 email: fna.salesuk@fivesgroup.com www.fivesgroup.com/fivesna
Specifications and Capacities Page 2 RFM Series Low and Medium Velocity Gas Burner with Refractory Baffle 1. Capacities The table below gives the air volume in Nm³/h at predefined pressures and temperatures. It identifies the physical size of the burner baffle related to this air flow, temperature and pressure drop. There are several options per body size with the maximum air pressure drop at 25 mbar. For sizing a baffle, take the required air flow in Nm³/h, the air temperature and the pressure drop and use this data to select the nearest baffle and body size. For other air temperatures, the pressure drop and volume can be re-calculated using the table shown. 2. Burner Turndown A turndown of up to 10:1 can be expected when using Natural gas please refer to FivesNA for other fuels. 3. Gas Pressure The burner gas pressure required depends on the gas lance used, the type of gas and gas volume please refer to the Gas Pressure Table on page 5. 4. Discharge Velocities The burner discharge velocity results from the total volume of burner exit gases at a given temperature and the burner tile discharge opening. The FM series burners, with the exception of the FM 0, do not employ conventional tiles and these have to be formed in the furnace wall refractories. Since the tile design will depend on the exhaust velocity required, differing outlet velocities can be chosen. However, discharge velocities higher than 80 m/s are not recommended because of the increased noise levels. Burner tiles can be supplied by FivesNA on special request. 5. Flame length Burner flame lengths are affected by many operational parameters such as burner duty, air temperature and baffle size etc. The values shown on the table below are given as a guide only. Capacities and specifications RFMG 1 RFMG 2 RFMG 3 RFMG 4 RFMG 5 RFMG 6 RFMG 7 Baffle Size Combustion Air Flows (Nm 3 /h) Baffle Dp (mbar) at 15 C Baffle Dp (mbar) at 350 C 10 25 10 25 630 556 879 378 597 635 756 1195 514 812 640 988 1562 671 1062 645 1250 1976 849 1343 650 1544 2441 1049 1659 655 1868 2953 1270 2007 660 2223 3514 1511 2389 665 2609 4125 1773 2801 670 3025 4782 2056 3251 860 2964 4686 2015 3186 865 3478 5499 2364 3738 870 4034 6378 2742 4336 875 4631 7322 3148 4978 880 5269 8330 3582 5664 885 5948 9404 4044 6393 890 6668 10543 4533 7168 8100 8232 13015 5597 8849 8110 9961 15749 6772 10707 8120 11854 18742 8059 12742 Flame Length (mm) 1800 2000 2300 2600 3000 3800 4500 Note: Values given above are based on a flame temperature of 1400 C and a discharge velocity of 50m/s.
Specifications and Capacities Page 3 AFM Series Low and Medium Velocity Gas, Light Oil and Combination Burners with Alloy Baffle 1. Capacities The capacity of the AFM series burner is restricted by the burner air inlet and the air temperature. The table below gives the maximum air volumes through the burner per body type. Three standard size baffles are available per body type. 2. Burner Turndown A turndown of up to 10:1 can be expected when using Natural gas please refer to FivesNA for other fuels. 3. Gas Pressure The burner gas pressure required depends on the gas lance used, the type of gas and gas volume please refer to the Gas Pressure Table on page 5. 4. Discharge Velocities The burner discharge velocity results from the total volume of burner exit gases at a given temperature and the burner tile discharge opening. The FM series burners, with the exception of the FM 0, do not employ conventional tiles and these have to be formed in the furnace wall refractories. Since the tile design will depend on the exhaust velocity required, differing outlet velocities can be chosen. However, discharge velocities higher than 80 m/s are not recommended because of the increased noise levels. Burner tiles can be supplied by FivesNA on special request. 5. Flame length Burner flame lengths are affected by many operational parameters such as burner duty, air temperature and baffle size etc. the values shown on the table below are given as a guide only. Capacities and specifications Notes: Combustion Air Flows (Nm 3 /h) Baffle Dp (mbar) at 15 C Baffle Dp (mbar) at 350 C 20 30 20 30 01 962 1178 654 800 AFM 02 1283 1571 872 1068 03 1603 1963 1089 1334 11 1924 2356 1308 1601 AFM 12 2244 2748 1525 1868 13 2565 3141 1743 2135 AFM 21 22 3206 3257 3926 4319 2179 2398 2669 2936 23 3847 4711 2615 3202 31 4489 5497 3052 3737 AFM 32 4809 5889 3269 4003 33 5130 6282 3487 4271 41 5771 7068 3923 4805 AFM 42 6412 7853 4359 5339 43 7054 8639 4796 5873 51 7965 9424 5231 6407 AFM 52 8336 10209 5667 6941 53 8977 10994 6103 7474 61 10260 12565 6975 8543 AFM 62 11542 14136 7847 9611 63 12826 15708 8720 10680 AFM 71 72 14107 15389 17277 18847 9591 10463 11746 12814 73 16671 20417 11334 13881 Flame Length (mm) 1. The above figures may be used to obtain the maximum thermal capacity and represents a 10% excess air level. 2. For capacities on oil greater than 12MW, refer to FivesNA as a special fuel lance is required. 3. This table is based on an air inlet velocity of 20m/s for cold air and 30m/s for hot air. When using preheated combustion air, the baffle has to be calculated for the maximum capacity and given air pressure drop. The pressure drops for preheated air are indications only. 1400 1800 2000 2300 2600 3000 3800 4500
Specifications and Capacities Page 4 SFM Series Low and Medium Velocity Gas, Light Oil and Combination Burners with Spinner Baffle 1. Capacities The capacity of the SFM series burner is restricted by the burner air inlet and the air temperature. The table below gives the maximum air volumes through the burner. The air pressure drop differs between 10mbar when the spinner flap is on 90 (low spin) and 20mbar with full spin setting. 2. Burner Turndown A turndown of up to 10:1 can be expected when using Natural gas please refer to FivesNA for other fuels. 3. Gas Pressure The burner gas pressure required depends on the gas lance used, the type of gas and gas volume please refer to the Gas Pressure Table on page 5. 4. Discharge Velocities The burner discharge velocity results from the total volume of burner exit gases at a given temperature and the burner tile discharge opening. The FM series burners, with the exception of the FM 0, do not employ conventional tiles and these have to be formed in the furnace wall refractories. Since the tile design will depend on the exhaust velocity required, any outlet velocity can be chosen. Discharge velocities higher than 80 m/s are not recommended because of the increased noise levels. Burner tiles can be supplied by FivesNA on special request. 5. Flame length Burner flame lengths are affected by many operational parameters such as burner duty, air temperature and baffle size etc. the values shown on the table below are given as a guide only. Capacities and specifications Combustion Air Flows (Nm /h) Flame Baffle Dp (mbar) at 15 C Baffle Dp (mbar) at 350 C* Length 10 (no spin) 20 (full spin) 10 (no spin) 20 (full spin) (mm) SFM 0 1697 1200 1153 815 1300 SFM 1 3040 2150 2066 1461 1300 SFM 2 5232 3700 3557 2515 1500 SFM 3 8485 6000 5769 4079 1700 SFM 4 11313 8000 7691 5439 2000 SFM 5 14849 15500 10096 7139 2200 SFM 6 23334 16500 15865 11218 2400 SFM 7 33941 24000 23076 16317 2600 Notes: 1. For oil capacities greater than 12MW, refer to FivesNA as a special fuel lance is required. 2.* Internally insulated body.
Gas Pressures Page 5 Gas Pressures required at the Burner Body for the RFMG, AFMG and SFMG Burners Natural Gas Pressure (mbar) RFMG/AFMG A Lance RFMG/AFMG B Lance* SFMG** 0 3 5 4 1 5 17 12 2 5 12 10 3 7 12 10 4 15 30 20 5 25 45 30 6 25 25 15 7 50 70 50 Notes: 1.* Figures shown are given at maximum disc opening - add 10mbar for normal operation with disc partially closed. 2 ** Add 15mbar to these figures for good gas distribution with disc partially closed. 3 Special fuel lances for Bio and other low CV gases are available to special order. 4 All CVs given are net. The above figures are given for Natural gas having an SG of 0.6 and a CV of 8320 kcal/nm³. For alternate gases, please use the following formula to obtain the correct gas supply pressure: Dp 2 = Dp 1 x (SG 2 /SG 1 ) x (CV 1 /CV 2 ) 2 Where: Dp 1 = Natural gas differential pressure listed above Dp 2 = Required differential pressure for new gas SG 1 = Specific Gravity of Natural gas (0.6) SG 2 = Specific Gravity of new gas CV 1 = Calorific Value of Natural gas (8320 kcal/nm³) CV 2 = Calorific Value of new gas
Dimensions Page 6
Dimensions Page 7 WARNING: The data outlined is for information only and does not form part of any contract. Our policy is one of continuous improvement and we therefore reserve the right to modify specifications or dimensions without prior warning. Situations dangerous to personnel and property can develop from incorrect installation and operation of combustion equipment. Fives North American Combustion UK, Ltd urges compliance with International, National and Local Safety Standards and that installation is carried out by properly qualified personnel.