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Method and system for regenerating and circulating ammonia by-product active calcium through ammonia-calcium desulfurization
The invention discloses a method and a system for regenerating and circulating ammonia by-product active calcium through ammonia-calcium desulfurization, and belongs to the technical field of ammonia desulfurization. According to the method, ultra-clean emission is realized by washing and recycling flue gas after ammonia-process two-stage sectional desulfurization, a relatively pure ammonium sulfate solution is obtained by aeration purification of a desulfurization solution, refined calcium hydroxide slurry and calcium-process desulfurization regeneration cycle ammonia and precipitated calcium sulfate gypsum are adopted, and Ca < 2 + > ions in the regeneration cycle ammonia are precipitated into calcium carbonate and new ammonia water is formed by adopting ammonium bicarbonate; calcium hydroxide which is not reacted in gypsum sediment is converted into calcium carbonate through carbonation modification, a high-quality and high-added-value calcium sulfate-calcium carbonate binary system active calcium product is obtained through modification drying, steam condensate water and gas washing liquid recycled through gas washing are all returned to a system for use, no waste residues or waste water is generated, and the method is suitable for grafting modification of various desulfurization systems.
一种氨钙脱硫再生循环氨副产活性钙的方法和系统，属于氨法脱硫技术领域。采用氨法两级分段脱硫后烟气洗气回收实现超净排放，采用脱硫液曝气净化获得较纯硫酸铵溶液，采用精制氢氧化钙料浆和钙法脱硫再生循环氨与沉淀硫酸钙石膏，采用碳酸氢铵将再生循环氨中Ca2+离子沉淀成碳酸钙并形成新的氨水，采用碳酸化改性将石膏沉淀中未反应的氢氧化钙转化成碳酸钙，通过改性干燥获得高品质、高附加值的硫酸钙‑碳酸钙二元系活性钙产品，蒸汽冷凝水和洗气回收的洗气液全部返回系统使用，无废渣废水产生，适合各种脱硫系统嫁接改造。
Method and system for regenerating and circulating ammonia by-product active calcium through ammonia-calcium desulfurization
The invention discloses a method and a system for regenerating and circulating ammonia by-product active calcium through ammonia-calcium desulfurization, and belongs to the technical field of ammonia desulfurization. According to the method, ultra-clean emission is realized by washing and recycling flue gas after ammonia-process two-stage sectional desulfurization, a relatively pure ammonium sulfate solution is obtained by aeration purification of a desulfurization solution, refined calcium hydroxide slurry and calcium-process desulfurization regeneration cycle ammonia and precipitated calcium sulfate gypsum are adopted, and Ca < 2 + > ions in the regeneration cycle ammonia are precipitated into calcium carbonate and new ammonia water is formed by adopting ammonium bicarbonate; calcium hydroxide which is not reacted in gypsum sediment is converted into calcium carbonate through carbonation modification, a high-quality and high-added-value calcium sulfate-calcium carbonate binary system active calcium product is obtained through modification drying, steam condensate water and gas washing liquid recycled through gas washing are all returned to a system for use, no waste residues or waste water is generated, and the method is suitable for grafting modification of various desulfurization systems.
一种氨钙脱硫再生循环氨副产活性钙的方法和系统，属于氨法脱硫技术领域。采用氨法两级分段脱硫后烟气洗气回收实现超净排放，采用脱硫液曝气净化获得较纯硫酸铵溶液，采用精制氢氧化钙料浆和钙法脱硫再生循环氨与沉淀硫酸钙石膏，采用碳酸氢铵将再生循环氨中Ca2+离子沉淀成碳酸钙并形成新的氨水，采用碳酸化改性将石膏沉淀中未反应的氢氧化钙转化成碳酸钙，通过改性干燥获得高品质、高附加值的硫酸钙‑碳酸钙二元系活性钙产品，蒸汽冷凝水和洗气回收的洗气液全部返回系统使用，无废渣废水产生，适合各种脱硫系统嫁接改造。
Method and system for regenerating and circulating ammonia by-product active calcium through ammonia-calcium desulfurization
氨钙脱硫再生循环氨副产活性钙的方法和系统
PENG ZHENCHAO (author) / HAN MOXIAN (author) / HAN SHUOHUAI (author) / ZHAO HONGWEI (author) / GUO XIAOKAI (author) / SU LIXIN (author) / ZHAO BORAN (author) / PAULUTH (author) / XIA WENQI (author) / WANG YONGYUE (author)
2022-07-08
Patent
Electronic Resource
Chinese
IPC:
B01D
SEPARATION
,
Trennen
/
C01C
Ammoniak
,
AMMONIA
/
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
C04B
Kalk
,
LIME
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