Russian Federation
Russian Federation
Russian Federation
A closed-cycle technology for building gypsum producing using energy waste and flue gases of thermal power plants has been developed. The technology is based on an absorption method for purifying gas emissions from industrial enterprises from sulfur dioxide SO2 using a suspension of carbonate sludge and obtaining a finished product – gypsum dihydrate. The commercial gypsum is obtained by using a suspension of carbonate sludge as a reagent. The suspension is formed at the stage of preliminary purification of natural water during coagulation and liming. Coagulation is carried out with ferrous sulfate heptate FeSO4×7H2O, liming – with a saturated solution of lime milk Ca(OH)2. As a result of combining the two processes, a suspension of a certain chemical composition is formed. The chemical composition of the sludge and its technological characteristics are presented. The main substance in the chemical composition is calcium carbonate CaCO3, which allows using a sludge suspension in the chemical reaction of the interaction of flue gases from thermal power plants with the formation of building gypsum. An absorber with a fluidized nozzle has been selected and designed to purify gas emissions from wet suspensions and produce commercial dihydrate gypsum. Hollow or solid hydrophobic polyethylene balls were selected as nozzles to reduce the adhesion of sludge suspension particles to their surface. A technological scheme is presented for purifying flue gases from sulfur dioxide to obtain the finished product – building gypsum. The scheme includes the proposed adsorber, sludge suspension tank, hydrocyclone and filter press. The cost of the resulting commercial building gypsum was calculated, which amounted to 15 rub./year, the payback period was 3,5 years. The prevented environmental harm from soil and land degradation from the introduction of this technology at thermal power plants was calculated by reducing the emission of sulfur dioxide into the air, which amounted to about 1 mil. rub./year.
gas emissions, sulfur dioxide, carbonate sludge suspension, absorber, gypsum dihydrate, commercial product
1. Ob utverzhdenii perechnya zagryaznyayushchih veshchestv, v otnoshenii kotoryh primenyayutsya mery gosudarstvennogo regulirovaniya v oblasti ohrany okruzhayushchej sredy: rasporyazhenie Pravitel'stva Ros. Federacii ot 8 iyunya 2015 g. № 1316-r. Dostup iz inf.-pravovogo portala «Garant».
2. Dominik Blasenbauer, Florian Huber. Legal situation and current practice of waste incineration bottom ash utilisation in Europe// Waste Management. 2020. Vol. 102. P. 868–883.
3. Trends in utilization of coal fly ash in india: a review / Venktesh Sharma [et al.] // Journal of Engineering Design & Analysis. 2019. T. 2. № 12-16. S. 13–16.
4. Kalygin V.G. Promyshlennaya ekologiya: ucheb. posobie dlya stud. vyssh. ucheb. zavedenij. 4-e izd., pererab. M.: Izd. centr «Akademiya», 2010. 432 s.
5. Sposob szhiganiya v kipyashchem sloe: pat. 2217658 Ros. Federaciya № 2002109885/06 / Puzyrev E.M., Sidorov A.M., Skryabin A.A., Shcherbakov F.V.; zayavl. 15.04.02; opubl. 27.11.03, Byul. № 3. 6 s.
6. Sposob polucheniya gipsa: pat. 1315387 Ros. Federaciya № 3950294 / Gladkij A.V., Govorov V.V.; zayavl. 30.05.85; opubl. 07.06.87, Byul. № 21.
7. Nikolaeva L.A. Ochistka stochnyh vod TES ot nefteproduktov gidrofobnym karbonatnym shlamom // Teploenergetika. 2020. № 10. S. 79–85.
8. Nikolaeva L.A., Husnutdinova E.M. Nauchnye podhody v tekhnologii ochistki gazovyh vybrosov ot oksida sery na promyshlennyh predpriyatiyah // Ekologiya i promyshlennost' Rossii. 2021. T. 25. № 4. S. 4–9.
9. Nikolaeva L.A., Golubchikov M.A. Ochistka proizvodstvennyh stochnyh vod ot nefteproduktov modernizirovannym sorbcionnym materialom na osnove karbonatnogo shlama // Vodosnabzhenie i sanitarnaya tekhnika. 2016. № 7. S. 51–58.
10. Absorber s psevdoozhizhennoj nasadkoj: pat. 2178333 Ros. Federaciya / Anan'ev A.A., Bekker V.F., Zatonskij A.V.; zayavl. 07.05.99; opubl. 20.01.02.
11. Maksim Kamarou, Natalia Korob. High-quality gypsum binders based on synthetic calcium sulfate dihydrate produced from industrial waste // Journal of Industrial and Engineering Chemistry. 2021. Vol. 100. P. 324–332.
12. Weiming Song, Jianan Zhou, Bao Wang. Production of SO2 Gas: New and efficient utilization of flue gas desulfurization gypsum and pyrite resources // Industrial & Engineering Chemistry Research. 2019. № 58. R. 20450–20460.
13. Obzornyj analiz sposobov polucheniya vyazhushchih iz gipsosoderzhashchih othodov promyshlennyh proizvodstv / N.I. Alfimova [i dr.] // Vestnik BGTU im. V.G. Shuhova. 2020. № 11. S. 8–16.
