Effects of moisture and pressure on densification process of raw material from Artemisia dubia Wall.

Zvicevičius, Egidijus; Raila, Algirdas; Čiplienė, Aušra; Černiauskienė, Judita; Kadžiulienė, Ž.; Tilvikienė, Vita

doi:10.1016/j.renene.2017.12.016

Cited by 34 publications

(18 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On this basis, water content, the ratio of pressure maintenance time to stabilization time, maximum compression stress, and straw feeding mass were selected as the testing factors. The Box-Behnken design, which can study the influence degrees of the factors, interactions and quadratic items on indicators by variance analysis, was adopted to optimize process parameters [43]. The Box-Behnken design is often used to optimize straw compression process parameters [26,27,44,45].…”

Section: Experimental Designmentioning

confidence: 99%

“…Lisowski et al [58] studied the densities of post-compression walnut shells, and Tumuluru et al [27] studied the densities of wheat, oat, canola, and barley straw both after compression and after two weeks of storage, these results showed the raw material water contents decreased the relaxation density of pressed straws. Zvicevicius et al [43] reported that the water content has a negative effect on post-compression straw density. The reason was that the straws containing more water were more elastic, which promoted the rebounding after compression and led to a decrease in the density of pressed straws.…”

Section: Two-factor Rsm Analysismentioning

confidence: 99%

See 1 more Smart Citation

Optimization of Cold Pressing Process Parameters of Chopped Corn Straws for Fuel

Chen

Zhang

et al. 2020

Energies

View full text Add to dashboard Cite

Pressed condensation is a key process before the reclamation of loose corn straws. In this study, the effects of stabilization time on the relaxation density and dimensional stability of corn straws were studied firstly, and then the stabilization time was determined to be 60 s by comprehensively considering the compression effect, energy consumption, efficiency and significance. On this basis, the effects of the water content (12%, 15%, 18%), ratio of pressure maintenance time to stabilization time (0, 0.5, 1), maximum compression stress (60.4, 120.8, 181.2 kPa) and feeding mass (2.5, 3, 3.5 kg) on the relaxation density, dimensional stability coefficient, and specific energy consumption of post-compression straw blocks were investigated by the Box–Behnken design. It was found that the water content, ratio of pressure maintenance time to stabilization time, maximum compression stress, and feeding mass all very significantly affected the relaxation density, dimensional stability coefficient and specific energy consumption. The interaction between water content and maximum compression stress significantly affected both relaxation density and specific energy consumption. The interaction between the ratio of pressure maintenance time to stabilization time and feeding mass significantly affected the dimensional stability coefficient. The factors and the indices were regressed by quadratic equations, with the coefficients of determination larger than 0.97 in all equations. The optimized process parameters were water content of 13.63%, pressure maintenance time of 22.8 s, strain maintenance time of 37.2 s, maximum compression stress of 109.58 kPa, and raw material feeding mass of 3.5 kg. Under these conditions, the relaxation density of cold-pressed straw blocks was 145.63 kg/m3, the dimensional stability coefficient was 86.89%, and specific energy consumption was 245.78 J/kg. The errors between test results and predicted results were less than 2%. The low calorific value of cold-pressed chopped corn straw blocks was 12.8 MJ/kg. Through the situational analysis method based on the internal and external competition environments and competition conditions (SWOT analysis method), the cold-pressed chopped corn straw blocks consumed the lowest forming energy consumption than other forming methods and, thus, are feasible for heating by farmers. Our findings may provide a reference for corn straw bundling, cold-press forming processes and straw bale re-compressing.

show abstract

Section: Experimental Designmentioning

confidence: 99%

Section: Two-factor Rsm Analysismentioning

confidence: 99%

Optimization of Cold Pressing Process Parameters of Chopped Corn Straws for Fuel

Chen

Zhang

et al. 2020

Energies

View full text Add to dashboard Cite

show abstract

“…Errors in overwetting protection design can reduce enclosing structure durability and result in premature failure of the building [1][2][3][4][5]. Moisture in enclosing structure thickness influences both on power saving properties of building thermal protective shell [6][7][8][9][10][11], and on human health [12].…”

Section: Moisture Regime and Its Role In Constructionmentioning

confidence: 99%

Assessment of enclosing structure moisture regime using moisture potential theory

2018

View full text Add to dashboard Cite

Abstract. The paper describes principal development directions of mathematical models of enclosing structure moisture regime. Benefits of mathematical models based on moisture potential theory are demonstrated. Moisture regime calculation by means of moisture potential, taking liquid and vapor moisture transfer into consideration, and using discretecontinual approach is proposed. New formulas for single-layer and multilayer enclosing structures allowing for numerical analytic determination of moisture potential value in any enclosing structure section, at any moment of time, under continuous control of temperature distribution, have been derived. Moisture distribution has been studied for a number of enclosing structures using different methods of moisture potential theory: unsteadystate method, quasi-stationary method, the proposed discrete-continual method. Moisture regime has been determined for single-layer enclosing structure with ceramic brick basement and lime brick cladding in Moscow. It is shown that the greatest moisture value is achieved in enclosing structure calculation by means of steady-state method. Unsteady-state method gives more accurate moisture distribution. The proposed discretecontinual method gives quantitative and qualitative result of moisture distribution similar to results obtained by unsteady-state method. The benefit of discrete-continual method is a distribution obtained analytically, which allows to use solution results without numerical method application.

show abstract

“…According to its guidelines, the share of renewables in the total final energy consumption in Lithuania will reach 35 % by the year 2030 [1]. Biomass is the main renewable resource in the Nordic countries [2]. Forests in Lithuania cover approximately 33 % territory of the country.…”

Section: Introductionmentioning

confidence: 99%

Influence of moisture on osier willow chops characteristics

Zvicevičius

Raila

Čiplienė

et al. 2019

Engineering for Rural Development

Self Cite

View full text Add to dashboard Cite

The world energy demand and declining fossil fuel resources make renewable energy resources to receive increased attention. Lithuania is sufficiently rich in renewable natural resources, and energy can be used from various types of solid biofuels, without being tied to fossil fuels, which have to be imported from other countries. Osier willows (Salix vinimalis) are one of the most cultured short rotations sprouts in the energetic plantations. These sprouts are willows which grow as bushes and have almost equal diameter and height of perennial stems. Preparing osier willows for fuel, the trunks of the trees are felled every four years, usually in the cold season. Osier willows are chopped by various shredders in the process after the removal of branches and leaves. Cutting willows in other seasons leads to the high moisture content and the biological activity of carving and other significant features: density, porosity, thermal conductivity, self-heating and other properties. According to the experiments, the highest biological activity (747 ± 43.5-379 ± 34.7 W·t -1 ) is characterized by willow chaff from 50.4 ± 0.14 % to 30.0 ± 0.075 % humidity. When the humidity reaches 11.6 ± 0.11 %, the wood carving becomes biologically inactive. It was found that the thermal and temperature conductivity of wood carving differ based on the difference in moisture. The maximum values of the temperature field (21.56 m 2 ·s -1 and 19.39 m 2 ·s -1 ) were fixed, when the chopped osier willow moisture was 30.0 ± 0.075 % and 38.4 ± 0.088 % respectively. Moreover, it is observed that, when the osier willow dries from 50.4 ± 0.14 % to 11.6 ± 0.11 % of moisture, its true wood density decreases by 21.2 % -from 808 ± 11.25 kg·m -3 to 637 ± 63.5 kg·m -3 . The density of the chopped osier willow decreased by 28.1 % -from 433 ± 5.13 kg·m -3 to 311 ± 3.05 kg·m -3 .

show abstract

Effects of moisture and pressure on densification process of raw material from Artemisia dubia Wall.

Cited by 34 publications

References 19 publications

Optimization of Cold Pressing Process Parameters of Chopped Corn Straws for Fuel

Optimization of Cold Pressing Process Parameters of Chopped Corn Straws for Fuel

Assessment of enclosing structure moisture regime using moisture potential theory

Influence of moisture on osier willow chops characteristics

Contact Info

Product

Resources

About