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Does the power plant use limestone powder or quicklime for desulfurization?
Limestone powder is used for desulfurization in power plants. Circulating fluidized bed boilers need to use limestone powder for desulfurization. The diameter of limestone particles should be less than 1mm. In terms of particle size distribution, the diameter of most particles should be concentrated in the area near D50. Most CFB boilers basically use limestone in the 0~1mm particle size range, and reduce the proportion of fine powder as much as possible.
The high-temperature bag filter is used to achieve the purpose of desulfurization, denitrification and dust removal at the same time for one device. The sulfur dioxide in the flue gas is sprayed into the flue before the bag filter with calcium-based or sodium-based desulfurizer and removed by the filter layer on the outside of the bag; The removal of NOx is achieved by spraying ammonia gas into the flue, and then by the selective catalytic reduction agent (SCR) installed inside the bag, and the dust removal is accomplished by the characteristics of the bag.
Limestone powder grinding mills
1. Raymond Mill:613-33 micron(30-325 mesh); D90=30 micron
ParametersModel Grinding Diameter(mm) Input Size(mm) Output Size(mesh) Power(KW) Capacity(t/h) Overall Dimension(mm) YGM9720 970 20 80-600 97 1.5-7.5 8200*6010*7200 YGM1280 1280 20 80-600 145 2-10 8500*7500*8200 YGM1300 1300 20 80-400 222 2-14 10100*9300*8330 YGM1620 1620 30 80-400 322 2.5-18 10250*8090*10510 YGM1720 1720 35 80-325 442 6-30 12500*12250*10400 YGM2150 2150 35 80-325 572 12-40 12000*11600*11000 2. HGM grinding mill:75-5 micron(150-2500 mesh); D97=5 micron
Parameters
Model HGM80 HGM80A HGM90L HGM100L-Ⅱ HGM100P HGM125L HGM1680L Ring Diameter(mm) 800 800 900 1000 1000 1250 1680 Ring Number (PCS) 3 3 4 4 4 4 4 Input Size (mm) ≤10 ≤10 ≤10 ≤15 ≤15 ≤20 ≤20 Output Size (mesh) 150-3000 150-3000 150-3000 150-3000 150-3000 150-3000 150-3000 Capacity (t/h) 0.5-5.5 0.5-5.5 0.8-6.5 1.2-10 1.2-11 2.5-20 5-45 Outlet Size L*W*H (mm) 8605*4139*6050 10454*3393*6626 11735*3952*7525 14507*3633*7562 14362*4200*7562 19261*4406*8591 25067*5414*9007 Main motor power (kw) 75 75 55*2 132/75*2 132/75*2 185 315 Flue gas desulfurization process
The power plant flue gas desulfurization process can be divided into three categories: wet method, dry method and semi-dry method according to the state of desulfurizer and desulfurization reaction products.1. Wet desulfurization process The process flow, form and mechanism of wet flue gas desulfurization in all countries in the world are similar, mainly using alkaline solution as a desulfurizing agent to absorb sulfur dioxide in the flue gas.Wet desulfurization processes mainly include: limestone/lime-gypsum method, seawater method, double-alkali method, sodium sulfite circulation method, magnesium oxide method and so on.2. The dry desulfurization process used in power plant flue gas desulfurization began in the early 1980s.Dry desulfurization processes mainly include: charged dry absorbent jet desulfurization method, electron beam irradiation method, adsorption method, etc.3. The semi-dry desulfurization process combines the advantages of wet and dry desulfurization processes and has broad application prospects.The semi-dry desulfurization process mainly includes: spray drying method, circulating fluidized bed method, humidified ash circulation method, flue injection method, etc. At present, flue gas desulfurization technology is dominated by wet desulfurization process, while dry and semi-dry desulfurization processes are also under development.About US
