Design and Application of Low Emission CFB Boiler with Energy-saving Technology

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1 Taiyuan Boiler Group Co., Ltd. Design and Application of Low Emission CFB Boiler with Energy-saving Technology

2 Cooperating with Tsinghua University, Taiyuan Boiler Group Co., Ltd achieved a major breakthrough in the field of CFB boiler. Its technology and products have been identified by the Ministry of Education, and won the second prize of National Scientific and Technological Progress Award. 2

3 Expert Conclusion: The energy-saving CFB boiler of Taiyuan Boiler Group Co., Ltd, with completely intellectual property rights, has significant advantages in auxiliary power saving and anti-abrasion. It has reached the advanced level.

4 At present, Taiyuan Boiler Group Co., Ltd has developed a series of energy-saving CFB boiler, with capacity from 75t/h to 1025t/h. The amount of CFB products under operation from 75 to 220t/h is more than 100. The 1000t/h level of CFB boiler is being installed and will be put into operation next year. 1025t/h 130t/h 220t/h 480t/h 75t/h 4

5 2-925t/h CFB boiler being installed

6 Technical Advantages Saving 30% of the fan energy consumption Saving 2-3% of the coal consumption Low abrasion: Continuous runtime: more than 6500 hours Runtime per year: more than 8000 hours Low emission: High desulphurization efficiency: higher than 95% when the Ca/S is 2. Low original emission of NO x : lower than 120mg/Nm3 for anthracite and lean coal; lower than 200mg/Nm3 for bituminous coal and lignite 6

7 1. Design Principle of the Products 7

8 Key points of the design 1. According to the design theory of Tsinghua University, the proper fluidized air velocity and circulating rate are chosen to make the flow regime stay in compound state of fast fluidization and turbulent fluidization. 2. High efficient cyclone is chosen. High flow rate, self-balance returning valve is chosen, each of the valve is equipped with a roots blower. The boiler can run stably with low bed pressure, which can reduce the abrasion of heating surface. 3. Air distributor system: applying the water-cooled distributor, low resistance wind caps. Preposed wind chamber is used to distribute the primary air uniformly. 4. Design of secondary air: a single layer of secondary air inlets is arranged to increase its penetrant power

9 5. The abrasion, expansion and seal should be considered in the design, and the components should be assembled in workshop as many as possible to maintain the quality. 6. Low Emission Design: In BMCR,the bed temperature should be lower than 880 for low emission purpose....

10 2. Operating results of Products 10

11 The first 220t/h energy-saving CFB boiler located in Hailaer, Inner Mogolia

12 DCS 控制画面

13 Power of air fan in Hailaer CFB boiler 5#(TY) 3 4# Primary air fan(kw) Secondary air fan(kw) Roots blower(kw) Induced draft fan(kw) Total power(kw) Energy saving(kw) 903 Energy saving percent(%) 32.7%

14 Electric current 5#(TY) 3 4# save primary air fan(a) % secondary air fan(a) % Induced draft fan(a) % Roots blower(a) % At the rated load, the air fan could save 550 kw h per day, namely 4.4 million kw h per year, according to 8000 hour running time per year. Because the #5 boiler operated at over load all the year round, it can save 500 thousand kw h per month.

15 Coal consumption 5#(TY) 3 4# Coal consumption(t/h) Saved coal(t/year) Saved coal per year(%) 2.5% Since 2008, the Hailaer 220t/h CFB boiler has been running in full load, even over load. There is rarely abrasion in the heating surface.

16 240t/h energy-saving CFB boiler located in Xing an power plant At full load, the bed pressure is 6.5KPa, bed temperature is 850

17 Power of air fan in Xing an CFB boiler 3#(TY) 1 2# Primary air fan(kw) Secondary air fan(kw) Roots blower(kw) Induced draft fan(kw) Total power(kw) Energy saving(kw) 1155 Energy saving percent(%) 47%

18 Comparison of 130t/h CFB boiler in Shengzhou Energy consumption of fan reduces 30%. Carbon content of fly ahs reduce from 7.4% to 2.6%. Before reforming: T = 950 P = 9.3KPa After reforming: T = 930 P = 7.6KPa

19 Comparison of pollutant emission #4: T = 930,NO2 = 458mg/m3, SO2 = 306mg/m3 #5(TY): T = 880,NO2 = 113mg/m3, SO2 = 97mg/m3

20 Flue gas components of TG260/9.81 CFB boiler in Xiang yang power plant CO /mg m -3 NO /mg m -3 NO 2 /mg m -3 N 2 O /mg m -3 SO 2 /mg m -3 H 2 O /% O 2 /% NO x /mg m -3 SO 2 /mg m - 3 CASE1 12: CASE2 13: NOx emission is lower than 100mg/m3, satisfying the new environmental standards

21 NOx emission of 95t/h CFB boiler in Huimei, Sichuan Burning Furong lean coal,original NOx emission is 88mg/Nm3

22 Thank you