Advanced Exhaust Emission Abatement - 144 MW Diesel Based Power Production with NOx, SOx, and PM Abatement - Design - Commissioning-Early Production Experience
Burmeister & Wain Scandinavian Contractor A/S has designed, constructed, and commissioned a 144 MW Diesel Engine based power plant for Enemalta Corporation on Malta in year 2012 with an exceptionally low level of emissions. The low emission level is based on a combination of well-proven and new advanced abatement techniques capable of complying with the most stringent emission norms. The power producing units of the plant are eight diesel generation sets, W(a)rtsil(a) 18V46 medium speed diesel engines with ABB AMG1600 alternators, each rated 17.1 MWe, and as bottom cycle one common Dresser Rand steam turbine generator with a Converteam alternator rated 13.2 MWe. The fuel of the plant is Heavy Fuel Oil with a maximum sulfur content of 1%. The flue gas abatement includes NOx abatement by Selective Catalytic Reduction, SOx and Particulate abatement by dry Flue Gas Desulfurization with Sodium Bi-Carbonate injection followed by filtration in a Bag- House filter. The plant is cooled by Sea Water. The obtained net plant electrical efficiency with the extensive utilization of the exhaust gas energy in boilers and the steam turbine generator is 46.9% with due consideration of auxiliary power consumption for emission abatement purposes. In addition the plant include two desalination units, each rated 700 m3 /day driven by engine cooling water, thus achieving a total thermal efficiency exceeding 50%. The major unabated flue gas emission with the installed equipment would have been approx. 2,000 mg/Nm3 nitrogen oxides (NOx), 565 mg/Nm3 Sulfur Oxides (SOx), and Particulate Matter (PM) 75 mg/Nm3 , all ref. 15% O2, dry. The contractual and obtained requirements are 150 mg/Nm3 nitrogen oxides (NOx), 112.5 mg/Nm3 Sulfur Oxides (SOx), and Particulate Matter (PM) 50 mg/Nm3 . The particulate matter is under all normal operational conditions much lower. The NOx reduction is obtained by a well established SCR principle with injection of Urea in aqueous solution. The Desulfurization is obtained through a dry Flue Gas Desulfurization (FGD) process with injection of Sodium-Bi-Carbonate (SBC) in reactors downstream the exhaust gas boilers. The cleaning for FGD reaction products and Particulate Matters is obtained with a Bag-House Filter downstream the SBC reactor. Each of the four parallel FGD plants treats the exhaust from two diesel engines. The complexity of the system can be judged from the general process diagram. The basic design parameters for the performance of the plant have been well proven during steady-state operation of the plant. A challenge when designing a plant with extreme extent of flue gas abatement equipment is the transient behavior during starting-up and load changing. The quickly reacting diesel engines and more slowly reacting exhaust gas equipment put strong requirements to adequate control of the systems. The early operational experience of the plant has proven the control concept to be adequate after initial trimming. The feasibility of the project, compared to alternatives, was established based on the cost of Heavy Fuel Oil and reagents for exhaust abatement a few years ago. Prevailing market price for fuel and reagents has currently improved the benefit of the chosen systems. Based on market price level the operation cost can be estimated as below. Energy & Abatement cost characteristics Cost element Amount Unit cost Cost Relative Main fuel ton/day EUR/ton EUR/day % HFO 1%S purchase 650 500 325,000 100% Abatement consumables ton/day EUR/ton EUR/day % Urea purchase 28.4 650 18,460 5.7% SBC purchase 35.4 275 9,735 3.0% FGD product disposal 29.6 350 10,360 3.2 Abatement aux. MWH/day EUR/MWh EUR/day % Electrical power 49.2 100 4,920 1.5 Total fuel and aux. Cost - - 368,475 113.4% Operation fulfilling emission requirements would be possible with distillate fuel with 0.1% S and NOx abatement with SCR. Distillate fuel with 0.1% S is expected to be in the neighborhood of 35% higher in price as compared to 1% S HFO. The Urea purchase would be unchanged and auxiliary power consumption for Urea injection would account for about 1%. Early operational experience during the first half year of operation of the plant will be presented in the final paper and presentation at the 2013 CIMAC conference.
Lars Ellegaard Knud Hvidtfeldt Rasmussen Claus Albrechtsen
Burmeister and Wain Scandinavian Contractor AS,Denmark
国际会议
上海
英文
1-11
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）