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ArticleName Substantiation of installation design for pneumatic peat harvester suction nozzle
DOI 10.17580/gzh.2022.05.08
ArticleAuthor Yablonev A. L., Shcherbakova D. M.

Tver State Technical University, Tver, Russia:

A. L. Yablonev, Head of Department, Doctor of Engineering Sciences,
D. M. Shcherbakova, Post-Graduate Student


The efficiency of suction of milling chips by pneumatic peat harvesters is largely governed by the height and angle of installation of the suction nozzle relative to the underlying surface. Since there are very few data and recommendations on this topic, in laboratory conditions, using a specially designed and created installation, a series of experimental work was carried out to identify rational values of the height and angle of the nozzle. The criteria were the most pronounced turbulence of the air flow (to create a lifting force) and the maximum length of the axis of the active zone of the suction plume (for a longer time of exposure of the air flow to the milling chips). The results showed that for the two examined types of peat – high-moor peat with a degree of decomposition of 5–10 % and a transitional degree of decomposition of 35–40 % for the maximum allowable fraction of 25 mm, the angle of installation of the suction nozzle of 30–35° is rational, and the height of the nozzle, equal to the size the maximum permissible conditioned fraction of milling chips, is 25 mm. It was with this arrangement of the nozzle th at the length of the axis of the active zone of the suction plume was maximum, and the air flow was with the most pronounced turbulence. To increase the efficiency of the pneumatic harvester, it is proposed to equip the suction nozzles with mouthpieces. The study proves that the maximum efficiency, according to the criterion of the length of the axis of the active zone of the suction flare, has a nozzle installed at an angle of 30–35°, equipped with a mouthpiece with an activation angle of 50–55°. The comparison of the efficiency of the nozzle without a mouthpiece and with a mouthpiece shows that the proposed mouthpiece is able to more than double the length of the axis of the active zone of the suction plume, and, consequently, to increase the efficiency of the machine.

keywords Milled peat, pneumatic harvester, suction nozzle, nozzle angle, suction flare, spread activation angle, suction flare core axis length

1. Panov V. V., Misnikov O. S., Kuporova A. V. Problems and prospects of development of peat production in Russian Federation. GIAB. 2017. No. 5. pp. 105–117.
2. Misnikov O. Basic Technologies and Equipment Used for Peat Deposits Development in Foreign Countries. Proceedings of III International Innovative Mining Symposium. 2018. E3S Web of Conferences. 2018. Vol. 41. 01046. DOI: 10.1051/e3sconf/20184101046
3. Mikhaylov A. V. Global peat market development. Trudy Instorfa. 2018. No. 18(71). pp. 3–7.
4. Сhertkova E., Sizova V. Production and Technological Parameters of Milled Peat Extraction Depending on Organization of Peat Machines Operation. Proceedings of IV International Innovative Mining Symposium. 2019. 2019. Vol. 105. 01002. DOI: 10.1051/e3sconf/201910501002
5. Stolbikova G. E., Ivanov V. A., Korolev I. O. An innovative approach to increase the harvest and to reduce emissions of peat in case of pneumatically gathering. GIAB. 2016. No. 10. pp. 105–110.
6. Pryagaev Yu. V. If there is any future for an air-drive swath collector? Torf i biznes. 2007. No. 2(8). pp. 23–26.
7. Gortsakalyan L. O. Design and manufacturing of pneumatic plants for peat milling and haulage : Teaching and guiding aid. Kalinin, 1973. 118 p.
8. Gortsakalyan L. O., Chernyshev V. V. Velocity field of suction, forcing and mixed suction–forcing cones of air-driven harvester nozzle. Peat Production Technology and Integrated Mechanization : Inter-University Subject Collection. Kalinin : KPI, 1977. pp. 28–32.
9. Gortsakalyan L. O. Effect of air-driven harvester travel velocity on variation in air-and-fuel mixture concentration. Peat Milling and Processing Mechanization : Transactions of the Kalinin Polytechnic University. Moscow, 1974. pp. 20–24.
10. Gorfin O. S., Fomin K. V. Conveyor transport : Tutorial. 2nd enlarged and revised edition. Tver : TGTU, 2008. 115 p.
11. Davydov L. R., Selennov V. G. Pneumatic peat milling. Torf i biznes. 2008. No. 4(14). pp. 24–28.
12. Kremcheyev E. A., Kremcheyeva D. A. Technological Approaches to Reducing the Loss of Peat Raw Materials in Fields with Hydrological Regime. Indian Journal of Science and Technology. 2016. Vol. 9, No. 12. DOI: 10.17485/ijst/2016/v9i8/895249
13. Ratamäki O., Jokinen P., Albrecht E., Belinskij A. Framing the peat: the political ecology of Finnish mire policies and law. Mires and Peat. 2019. Vol. 24. 17. DOI: 10.19189/MaP.2018.OMB.370
14. Yablonev A. L., Shcherbakova D. M. Suction cone of air-driven peat harvester KTT-2. GIAB. 2019. No. 12. Special issue 39. Peat milling and processing technologies, peat equipment and repair. pp. 47–58.
15. Yablonev A. L., Shcherbakova D. M. Study of aerodynamic parameters of milled peat produced by LLC Pindstrup. Trudy Instorfa. 2020. No. 22(75). pp. 32–37.
16. Yablonev A. L., Shcherbakova D. M. On the dependence of the actual length of the axis of the suction zon on the angle of installation of the nozzle of the pneumatic peat harvester. Mezhdunarodnyi nauchno-issledovatelskiy zhurnal. 2021. No. 11-1(113). pp. 79–85.
17. Petrenko S. M., Berezovskiy N. I. Effect of operating parameters of vertical pneumatic transport of crushed peat on relative sliding of air and solid phases. Vestnik Tverskogo gosudarstvennogo tekhnicheskogo universiteta. Ser.: Tekhnicheskie nauki. 2020. No. 3(7). pp. 50–57.

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