Modeling of milled straw heap separation in air-flow classificator with three pneumatic ducts

The research subject is a multivariate analysis of the air-flow classification process of the straw heap with a predetermined fractional composition supplied to the cleaning after the drum destroyer. The work objective is to identify patterns of the air separation using three pneumatic ducts with a linkage parameter variation. The investigative technique is an analytical modeling. The effect of probabilistic characteristics of the heterogenic thrashed heap supply, airflow velocity distribution by the separator width, and density function of heap components terminal velocity on the separation is evaluated. The air-flow classification process on each section of the pneumatic duct is considered. To this end, the mathematical expressions averaging the air classification indicators of the consistently functioning three pneumatic ducts and a stochastic quasistatic mathematical model of the separator operation with three pneumatic ducts in series are used. The results of the separator parametric synthesis and its technological parameters are presented. The fractional constituents of the heap components and their percent-sizes in each air-classified fraction are shown. The possibility of the air-flow classification of the crushed straw heap in the predetermined factions at the preset productivity of 0.6-0.7 kg/m∙s is revealed. It is found that under the rational functioning of the air separator, the straw content in the service faction is 97.03%. In this case, the minimum grain content is 0.03%, and mineral impurities are 0%. It is revealed that the air separator with three pneumatic ducts in series is sufficient for separating the crushed straw heap with the predetermined agro-technical requirements.

пневмосепаратор, математическая модель, измельченный соломистый ворох, моделирование, показатели сепарации, air-flow classificator, mathematical model, milled straw heap, modeling, separation characteristics

1. Yermolyev, Y.I., et al. Parametricheskiy analiz ustroystva dlya razrusheniya tyukov solomy. [Parametric analysis of straw wad destroyer.] Vestnik of DSTU, 2015, no. 2 (81), pp. 108–116 (in Russian).

2. Lupoi, J.S., et al. Recent innovations in analytical methods for the qualitative and quantitative assessment of lignin. Renewable and Sustainable Energy Reviews, 2015, vol. 49, pp. 871–906.

3. Padkho, N. A new design recycle agricultural waste materials for profitable use rice straw and maize husk in wall. Procedia Engineering, 2012, vol. 32, pp. 1113–1118.

4. Junjun, L.U., Chanjuan, J.A., Chunxia, H.E. Flexural properties of Rice Straw and Starch Composites . AASRI Procedia, 2012, vol. 3, pp. 89–94.

5. Yermolyev, Y.I., et al. Modelirovanie protsessa separatsii izmel'chennogo solomistogo vorokha v pnevmoseparatore s dvumya pnevmokanalami. [Modeling of milled straw heap separation in air-flow classificator with two pneumatic ducts.] Vestnik of DSTU, 2014, vol. 10, no. 2 (77), pp. 93–102 (in Russian).

6. Yermolyev, Y.I., ed. Tekhnologicheskie operatsii i tekhnicheskie sredstva dlya sovremennykh tekhnologiy agropromyshlennogo kompleksa. [Process operations and facilities for modern technologies of agroindustrial complex.] Rostovon- Don: DSTU Publ. Centre, 2012, 158 p. (in Russian)

7. Yermolyev, Y.I. Modelirovanie vozdushno-reshetnoy zernoochistitel'noy mashiny. [Air-and-screen cleaner modeling.] Vestnik of DSTU, 2010, vol. 10, no. 8 (51), pp. 1245–1254 (in Russian).

8. Yermolyev, Y.I., Lukinov, G.I. Energosberegayushchie tekhnologii separatsii zernovykh otkhodov na predpriyatikh priema, pererabotki i khraneniya zerna. [Energy- saving technologies of grain waste separation at the centres of grain receiving, processing and storage.] Rostov-on-Don: DSTU Publ. Centre, 2007, 234 p. (in Russian).

9. Yermolyev, Y.I., et al. Proektirovanie tekhnologicheskikh protsessov i vozdushno-reshetnykh i re-shetnykh zernoochistitel'nykh mashin. [Designing of processes and air-and-screen and sieve grain cleaners.] Rostov-on-Don: DSTU Publ. Centre, 2010, 638 p. (in Russian).

10. Yermolyev, Y.I., Shaforostov, V.D., Butovchenko, A.V. Otsenka osnovnykh zakonomernostey funktsionirovaniya podsistemy reshetnyy yarus — pnevmoseparator vozdushno-reshetnoy zernoochistitel'noy mashiny. [Assessment of operation basic trends of screen tier-pneumatic separator of air-and-screen cleaner subsystems.] Vestnik of DSTU, 2011, vol. 11, no. 4 (55), pp. 480–488 (in Russian).

11. Saitov, V.E., Gataullin, R.G. Optimizatsiya konstruktivno-tekhnologicheskikh parametrov pervogo pnevmosepariruyushchego i dopolnitel'nogo kanalov zamknutoy malogabaritnoy pnevmosistemy. [Optimization of design and technological parameters of the first and additional pneumatic-separating channels of the closed compact pneumatic system.] Problemy intensyfikacji produkcji zwierzecej z uwzglednieniem ochrony srodowiska I standardow UE: XIV Miedzynarodowa Konferencja Naukowa. Warszawa, 2008, pp. 71–79 (in Russian).

12. Saitov, V.E., Farafonov, V.G., Suvorov, A.N. Determination technique of key parameters the closed small-sized grain separators. International Journal Of Applied And Fundamental Research, 2013, no. 2. Available at: URL:http://www.science-sd.com/455-24135 (accessed: 06.11.13).

13. Saitov, V.E. Matematicheskoe modelirovanie razdeleniya vozdushnym potokom otkhodov pri ochistke zerna. [Mathematical modeling of the airflow classification of the waste in grain cleaning.] Tractors and Agricultural Machinery, 2007, no. 5, pp. 39–41 (in Russian).

14. Yermolyev, Y.I., Muratov, D.K. Modelirovanie protsessa funktsionirovaniya tsentrobezhnykh ventilyatorov v vozdushno-reshetnoy ochistke zernouborochnogo kombayna. [Modeling of centrifugal fan performance in air-screen separator of combine harvester.] Vestnik of DSTU, 2011, vol. 11, no. 8 (59), iss. 1, pp. 1238– 1246 (in Russian).