Change in Grain-Size Composition of Lignite under Cyclic Freezing-Thawing and Wetting-Drying

The paper presents the change in grain-size composition of lignite under cyclic freezing-thawing (FTC) and wetting-drying (WDC). The article shows that in the spring and autumn periods the lignites can be subjected to repeated freezing-thawing and wetting-drying, which determines the possibility of changing their grain-size composition and structure. Experimental studies in laboratory conditions on the influence of cyclic freezing-thawing (FTC) and wetting-drying (WDC) on the quality indicators of lignites have been carried out, their granulometric (fractional) composition has been studied. Freezing-thawing cycle conditions are as follows (FTC): minimum exposure temperature: -20°C;maximum: +5°C;relative humidity: 30%;number of processing cycles: 3. Wetting-drying cycles are as follows (WDC): drying temperatures are +20, +40, +60, +80°C, drying time 90 minutes, the coals are further subjected to rain (soaking) for a period of water saturation to humidity of 30% - 40% and dry again. The number of wetting-drying cycles is 3 times. The tests have revealed the destructive effects of FTC and WDC on the samples of lower metamorphic grade coal, and the cycles of wet-dry lead to the much higher yield of fine sizes (-6+0;-13+0 mm) than the cycles of freeze-thaw. Furthermore, it is found that the increase in the yield of fines depends on the heating temperature: coal disintegration proceeds more intensively at a higher temperature of drying.

Effect of Supplementary Irrigation on the Yield of Sorghum (Sorghum bicolor L. Moench) in the Context of Climate Change in the Dry Savannahs of Togo

Under the current context of climate change, supplementary irrigation may be needed for crop production resilience. We determined the effects of supplementary irrigation on sorghum grain yield in the dry Savannah region of Togo. A two-year trial was conducted in a controlled environment at AREJ, an agro-ecological center in Cinkassé. The plant material was sorghum variety Sorvato 28. The experimental design was a Completely Randomized Block with three replications and three treatments as follows: T0 control plot (rainfed conditions);T1 (supplementary irrigation from flowering to grain filling stage) and T2 (supplementary irrigation from planting to grain filling stage). Two irrigation techniques (furrow and Californian system) were used under each watering treatment. The results showed that irrigation technique significantly affected panicle length with no effect on 1000 grains mass. Panicle length and grain yields varied from 15.59 to 25.71 cm and 0.0 to 2.06 t∙h−1, respectively, with the highest values (25.66 cm and 2.06 t∙h−1, respectively) under the T2 treatment with the California system-based supplementary irrigation. The comparison of results obtained on treatment T0 and T2, shows that supplementary irrigation increased the yields by at least 68.62%. Supplementary irrigation during sowing and growing season (T2) improved sorghum yields in the dry savannahs of Togo, with a better performance of the California irrigation system.

Dynamics of maize grain drying in the high latitude region of Northeast China

A high grain moisture content at harvest has been an important problem in the high latitude region of Northeast China, and it is closely related to the genotypes of varieties, local meteorological factors and planting management. However, delayed harvest at a low temperature could not effectively reduce the grain moisture content. In this study, we continuously observed the grain drying during the late stage of different maturing types of maize varieties in Daqing, Heilongjiang Province, China in 2016 and 2017. A two-segment linear model was used to analyze the different stages of the drying processes: 1) Twosegment linear model fitting can divide the grain drying process of all varieties into two separate linear drying processes with different slopes. 2) During the rapid drying stage, the drying was faster at a higher temperature. The rate of slow drying was influenced by air vapor pressure. 3) The moisture content and meteorological factors when the drying rate turns from one stage into the other were not consistent between varieties and years. After entering the frost period, temperatures below 0℃ will significantly reduce the rate of grain drying. 4) Due to the short growth period of early-maturing varieties, the drying time was prolonged, and the grain moisture content was lower than that of the mid-late maturing varieties. Local meteorological conditions do not allow the drying of mid-late maturing varieties to achieve a lower moisture content. When the temperature falls below 0℃, the drying rate of grain decreases markedly. Therefore, one feasible way to solve the problem of high moisture content is to replace the early-maturing varieties and implement the corresponding cultivation techniques.

Moderate wetting and drying increases rice yield and reduces water use, grain arsenic level, and methane emission

To meet the major challenge of increasing rice production to feed a growing population under increasing water scarcity,many water-saving regimes have been introduced in irrigated rice,such as an aerobic rice system,non-flooded mulching cultivation,and alternate wetting and drying(AWD).These regimes could substantially enhance water use efficiency(WUE) by reducing irrigation water.However,such enhancements greatly compromise grain yield.Recent work has shown that moderate AWD,in which photosynthesis is not severely inhibited and plants can rehydrate overnight during the soil drying period,or plants are rewatered at a soil water potential of-10 to-15 k Pa,or midday leaf potential is approximately-0.60 to-0.80 MPa,or the water table is maintained at 10 to 15 cm below the soil surface,could increase not only WUE but also grain yield.Increases in grain yield WUE under moderate AWD are due mainly to reduced redundant vegetative growth;improved canopy structure and root growth;elevated hormonal levels,in particular increases in abscisic acid levels during soil drying and cytokinin levels during rewatering;and enhanced carbon remobilization from vegetative tissues to grain.Moderate AWD could also improve rice quality,including reductions in grain arsenic accumulation,and reduce methane emissions from paddies.Adoption of moderate AWD with an appropriate nitrogen application rate may exert a synergistic effect on grain yield and result in higher WUE and nitrogen use efficiency.Further research is needed to understand root–soil interaction and evaluate the long-term effects of moderate AWD on sustainable agriculture.

Grain yield and water use efficiency of super rice under soil water deficit and alternate wetting and drying irrigation

This study investigated if super rice could better cope with soil water deficit and if it could have better yield performance and water use efficiency （WUE） under alternate wetting and drying （AWD） irrigation than check rice. Two super rice cultivars and two elite check rice cultivars were grown in pots with three soil moisture levels, well watered （WW）, moderate water deficit （MWD） and severe water deficit （SWD）. Two cultivars, each for super rice and check rice, were grown in field with three irrigation regimes, alternate wetting and moderate drying （AWMD）, alternate wetting and severe drying （AWSD） and conventional irrigation （CI）. Compared with that under WW, grain yield was significantly decreased under MWD and SWD treatments, with less reduction for super rice than for check rice. Super rice had higher percentage of productive tillers, deeper root distribution, higher root oxidation activity, and greater aboveground biomass production at mid and late growth stages than check rice, especially under WMD and WSD. Compared with CI,AWMD increased, whereasAWSD decreased grain yield, with more increase or less decrease for super rice than for check rice. Both MWD and SWD treatments and eitherAWMD orAWSD regime significantly increased WUE compared with WW treatment or CI regime, with more increase for super rice than for check rice. The results suggest that super rice has a stronger ability to cope with soil water deficit and holds greater promising to increase both grain yield and WUE by adoption of moderate AWD irrigation.

Influence of High Temperature Stress on Net Photosynthesis, Dry Matter Partitioning and Rice Grain Yield at Flowering and Grain Filling Stages

Climate change is recognized to increase the frequency and severity of extreme temperature events. At flowering and grain filling stages, risk of high temperature stress （HTS） on rice might increase, and lead to declining grain yields. A regulated cabinet experiment was carried out to investigate effects of high temperature stress on rice growth at flowering and grain- filling stages. Results showed that no obvious decrease pattern in net photosynthesis appeared along with the temperature rising, but the dry matter allocation in leaf, leaf sheath, culm, and panicle all changed. Dry weight of panicle decreased, and ratio of straw to total above ground crop dry weight increased 6-34% from CK, which might have great effects on carbon cycling and green house gas emission. Grain yield decreased significantly across all treatments on average from 15 to 73%. Occurrence of HTS at flowering stage showed more serious influence on grain yield than at grain filling stage. High temperature stress showed negative effects on harvest index. It might be helpful to provide valuable information for crop simulation models to capture the effects of high temperature stress on rice, and evaluate the high temperature risk.

Experiment research on grain drying process in the heat pump assisted fluidized beds

A heat pump assisted fluidized bed grain drying experimental system wasdeveloped. Based on this system, a serial of experiments was performed under four kinds of air cycleconditions. According to the experimental analysis, an appropriate drying medium-air cycle for theheat pump assisted fluidized bed drying equipment was decided, which is different from the commonlyused heat pump assisted drying system. The experimental results concerning the drying operationperformance of the new system show that the averaged coefficient of performance (COP) can reach morethan 2.5. The economical evaluation was performed and the power consumption for removing a kilogramwater from grains was about 0.485 kW-h/kg (H_2O), which shows its reasonable commercial efficiencyand great application potentiality in future market.

Effects of exogenous ABA application on post-anthesis dry matter redistribution and grain starch accumulation of winter wheat with different staygreen characteristics

The objective of this study was to investigate whether and how exogenous abscisic acid(ABA)is involved in mediating starch accumulation in the grain and redistribution of carbohydrates during grain filling of two wheat cultivars with different staygreen characteristics.At blooming stage,plants of Wennong 6(a staygreen cultivar)and Jimai 20(control)were sprayed with10 mg L-1abscisic acid(ABA)for 3 days.The application of ABA significantly(P<0.05)increased grain filling rate,starch accumulation rate and content,remobilization of dry matters to kernels,and 1000-grain weight of the two cultivars.Exogenous ABA markedly(P<0.05)increased grain yield at maturity,and Wennong 6 and Jiami 20 showed 14.14%and 4.86%higher compared yield than the control.Dry matter accumulation after anthesis of Wennong 6 was also significantly(P<0.05)influenced by exogenous ABA,whereas that of Jimai 20 was unchanged.Application of ABA increased endogenous zeatin riboside(ZR)content 7 days after anthesis(DAA),and spraying ABA significantly increased endogenous indole-3-acetic acid(IAA)and ABA contents from 7 to 21 DAA and decreased gibberellin(GA3)content at 14 DAA,but increased GA3content from 21 to 35 DAA.The results suggested that increased yield of staygreen was due to greater starch assimilation owing to a higher filling rate and longer grain-filling duration.

Performance Assessment of an Allothermal Auger Gasification System for On-Farm Grain Drying

Biomass gasification is a well-developed technology with the potential to convert agricultural residues to value-added products. The availability of on-farm gasifiers that can handle low-density agricultural wastes such as soybean residue, an underutilized feedstock, is limited. Therefore, the goal of this research was to install and assess an allothermal, externally heated, auger gasifier capable of converting agricultural wastes to combustible gas for on-farm grain drying. The system was used to convert soybean residues under different reactor temperature, i.e., 700°C, 750°C, 800°C, and 850°C. The results showed that increasing the reactor temperature from 700°C to 850°C increased the producer gas molar fractions of H2, CO, and CH4, from 1.1% to 1.5%, from 15.0% to 23.8%, and from 5.1% to 7.7%, respectively. The higher heating value of the producer gas reached 6.3 MJ/m3 at reactor temperature of 850°C. Specific gas yield increased from 0.32 to 0.58 m3/kgbiomass while char and particulate yield decreased from 41.7% to 33.6% by increasing the reactor temperature from 700°C to 850°C. Maximum carbon sequestration achieved, in the form of biochar-carbon, was 32% of the raw feedstock carbon. Gasification of collectable soybean residues from 1 acre would be sufficient to dry 1132 kg of soybean seeds (the average yield from one acre)

The heterotic effects on dry matter production and grain yield formation in hybrid rice

We studied the characteristics of dry matterproduction and matter partitioning in hybridrice and the relationships of them with heterot-ic effect in 1993. Two popular indica hybrids, Shanyou 63(Zhenshan 97A/Minhui 63 ) and Teyou 63(Longtepu A/Minhui 63), as well as theircommon restorer line, Minhui 63 (elite cultivar

Development of Highly Digestible Grain Sorghum Lines Suitable for Efficient Dry-Grind Ethanol Production

Low-world oil prices but supportive government policies provide growing environmental and energy security support favorable for the bioethanol market. The need to generate large and sustainable supply of biomass to make bioethanol will require the development of crops grown specifically for bioenergy production. Given the existing history of genetic improvement and infrastructure available for sorghum, (Sorghum bicolor L. Moench) hybrids will be one of the several species dedicated as energy crop and the subject of this study. Texas A & M University Sorghum Breeding Program has developed hybrid sorghum varieties with high protein digestibility and improved starch digestibility. Most of the previous research on grain sorghum focused on the digestibility of sorghum protein from the nutritional point of view. The aim of the current study was to select best sorghum lines from? relatively large and diverse sorghum samples that breeders are currently working with for the development of new low energy input liquefaction, saccharification and fermentation methodologies to produce bioethanol. Limited researches studies report on the performance of sorghum varieties in ethanol fermentation in relation to the protein and starch digestibility of sorghum.

混流式水稻烘干塔温度远程监测系统设计

针对混流式水稻烘干塔温度难以远程监测的问题,设计了一种基于Python和LoRa技术的温度远程监测系统。系统以STM32F1单片机硬件系统为下位机,通过PT1000温度传感器测得烘干塔温度信息,判断水稻烘干塔干燥状态,并通过LoRa无线模块将状态信息传输至上位机人机界面实时显示。生产试验结果表明:整套系统数据传输性能稳定,传输距离远,数据传输成功率达96%以上,满足复杂工作环境要求,能够实现粮食干燥过程的温度实时监测功能。

Determination of the Drying Kinetics Modeling and Activation Energy of Medium-Grain and Long-Grain Rough Rice under Isothermal Conditions

The available literature revealed a gap in reporting the rough rice drying kinetics parameters under isothermal conditions, particularly for Arkansas medium- and long-grain varieties. Therefore, medium-grain (RO170112 and Titan) and the long-grain (Diamond and Wells) rough rice varieties were dried under isothermal conditions. The drying process occurred under 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, and 100°C in a system emulating the thermogravimetric analyzer. Drying kinetics models were studied for four well-known models: Page, Newton, Logarithmic, and Henderson & Pabis. The drying kinetics constants were determined for the four studied models. The initial moisture content of rough rice was 28.2% db. Profound moisture reduction was observed during the first three hours of drying, followed by less moisture content reduction. The results showed that at the drying temperature of 100°C and after 6 hours of the drying process, the lowest moisture content reached 13.9% (db) for Titan rough rice. The drying rate of rough rice ranged between 7.41 and 2.01%/h during the first hour of drying under the studied temperature range of 40°C to 100°C. The drying rate was higher with the higher temperature levels during the first three hours. Among all the studied models, the Page, Newton, and Logarithmic models best fit 25%, 25%, and 50% of the twenty-eight studied cases. The challenge that arose from these results led to evolving a mathematical solution by joining the three models in one equation. The combined model showed the best fit for all the studied cases, with R2 ranging between 0.9999 and 0.9954 for the medium- and long-grain rice varieties. Increasing the drying temperature increased the effective moisture diffusivity values. The highest effective moisture diffusivity of 18.104 × 10-9 m2/s was obtained at the drying temperature of 100°C for medium-grain rice, Titan. The activation energy values ranged between 17.77 and 24.48 kJ/mol for the four rough rice varieties.

化肥优化减施对麦茬旱直播稻强、弱势粒食味与营养品质的影响

以常规施肥处理(F0,施N 350 kg/hm^(2)、P_(2)O_(5)135 kg/hm^(2)、K_(2)O 135 kg/hm^(2))为对照,研究不同化肥优化减施处理(F1:施N 280 kg/hm^(2)、P_(2)O_(5)108 kg/hm^(2)、K_(2)O 135 kg/hm^(2);F2:施N 210 kg/hm^(2)、P_(2)O_(5)81 kg/hm^(2)、K_(2)O 135 kg/hm^(2);F3:施N 140 kg/hm^(2)、P_(2)O_(5)54 kg/hm^(2)、K_(2)O 135 kg/hm^(2))对麦茬旱直播稻强、弱势粒食味与营养品质的影响,以期为直播稻优质高产施肥管理提供参考。结果表明,各化肥优化减施处理总体上均显著提高了直播稻强、弱势粒崩解值和峰值黏度,改善了食味品质,F1、F2、F3处理强势粒的崩解值分别比F0处理显著提高8.35%、7.65%、9.78%,F1、F3处理弱势粒的崩解值分别比F0处理显著提高13.25%、11.13%。各化肥优化减施处理总体上均显著降低了强、弱势粒中组氨酸、脯氨酸及锰含量,总体上均显著提高了强、弱势粒中酪氨酸、精氨酸、赖氨酸含量和弱势粒中铜、锌含量,另外,F1处理还显著提高弱势粒中铁含量,F2处理显著提高强势粒中铁、铜含量及强、弱势粒中钙含量。与F0处理相比,F1、F2、F3处理强势粒的酪氨酸含量分别显著提高100.28%、44.76%、41.08%,弱势粒的酪氨酸含量分别显著提高85.21%、61.64%、22.47%;F1、F2、F3处理强势粒的赖氨酸含量分别显著提高28.87%、27.32%、70.62%,F1和F3处理弱势粒的赖氨酸含量分别显著提高27.23%、39.44%;F1、F2、F3处理强势粒的精氨酸含量分别显著提高6.54%、11.84%、2.18%,弱势粒的精氨酸含量分别显著提高32.83%、33.59%、23.02%。与F0处理相比,F1处理弱势粒铁含量显著提高27.16%,F1、F2、F3处理弱势粒锌含量分别显著提高18.86%、6.56%、3.39%,F1、F2、F3处理弱势粒铜含量分别显著提高2.49%、2.95%、3.11%。综上,化肥优化减施在提高强、弱势粒食味品质的同时,可以改善营养品质,总体上以F1处理最优。

不同播幅对小麦花后叶片光合特性和产量的影响

为了明确不同播幅对小麦籽粒产量的影响及其形成的生理原因,本研究于2019—2020年和2020—2021年冬小麦生长季,在山东省济宁市兖州区小孟镇史家王子村小麦试验站大田试验条件下设置2种播幅处理:处理1是播幅为8 cm(B1);处理2是播幅为3 cm(B2)。研究了不同播幅对小麦光合特性、冠层光截获特性、干物质积累与转运和籽粒产量的影响。试验结果表明:B1处理开花后叶面积指数和冠层光合有效辐射截获率显著高于B2处理,其冠层光合有效辐射透射率显著低于B2处理;B1处理开花后旗叶叶绿素相对含量、净光合速率、蒸腾速率和气孔导度均显著高于B2处理,其胞间二氧化碳浓度显著低于B2处理;B1处理开花期和成熟期干物质积累量、开花后干物质在籽粒中的分配量、成熟期籽粒干物质积累量均显著高于B2处理;B1处理穗粒数、千粒重均显著高于B2处理;与B2处理相比,B1处理的2年平均籽粒产量和光能利用率分别高6.12%和7.71%。综上所述,播幅为8 cm的B1处理通过塑造了合理的冠层结构,改善了开花后叶片的光合性能,有利于开花后植株的光合物质生产,从而获得了最高的籽粒产量和光能利用率,为本试验条件下的最优处理。研究为小麦宽幅播种节水高产高效栽培技术提供了理论依据。

不同灌溉模式对籼粳杂交稻甬优1540产量与水分利用效率的影响

旨在探讨不同灌溉模式对籼粳杂交稻甬优1540产量与水分利用效率的影响,并阐明其相关生理基础。本研究以甬优1540为材料,设置了3种灌溉模式,即长淹灌溉(continuous flooding,CF)、轻度干湿交替灌溉(alternate wetting and moderate drying, AWMD)以及重度干湿交替灌溉(alternate wetting and severe drying, AWSD)。研究结果表明,与CF相比, AWMD与AWSD均能显著提高水分利用效率,增幅分别为22.6%~25.6%与18.2%~23.1%;AWMD可以显著提高水稻产量,增幅为8.6%~10.0%,而AWSD则显著降低水稻产量,降幅为6.0%~7.5%。与CF相比, AWMD显著降低了拔节期水稻的茎蘖数、地上部干物质重、叶面积指数、移栽至齐穗期的光合势以及移栽至拔节期的作物生长速率,但显著提高了茎蘖成穗率、拔节至齐穗期的作物生长速率、主要生育期水稻根长密度、深根比、比根长、根系总吸收表面积与活跃吸收表面积,以及灌浆后2次土壤复水期的剑叶净光合速率、根系氧化力、根系与叶片中玉米素和玉米素核苷(Z+ZR)含量、籽粒中蔗糖-淀粉代谢途径关键酶活性等指标。以上结果表明, AWMD可以协同提高甬优1540产量与水分利用效率,优化根-冠生长发育特征,提高灌浆期植株生理活性,实现高产与水分高效利用,为本研究最佳水分管理模式。

缓释掺混肥配比对稻茬小麦产量、氮素利用和籽粒品质的影响

为探究不同缓释掺混肥配比对稻茬小麦生产的影响,在沿淮下游地区,以淮麦52和淮麦920为材料,通过随机区组试验,以缓释掺混肥(SRF,N∶P2O5∶K_(2)O=26∶12∶12)和丰卉尿素(U,46%N)为供试肥料,设置U四次分施(M_(1))、SRF一次基施(M_(2))、60%SRF基施+40%U拔节期追施(M_(3))、60%SRF基施+40%SRF返青期追施(M_(4))、M_(3)模式减氮15%(M_(5))和M_(4)模式减氮15%(M_(6))6种施肥模式,分析了不同处理下小麦产量、氮素积累及利用、干物质转运和品质等的差异。结果表明,缓释掺混肥一次基施(M_(2))和减氮15%条件下两次分施(M_(5)和M_(6))较常规肥料处理(M_(1))均能实现稳产。缓释掺混肥两次分施(M_(4))可有效促进稻茬小麦花后光合物质生产和氮素向籽粒运转,增加籽粒氮素积累量,提高氮肥利用率,氮肥农学效率、氮肥表观利用率、氮素生理效率和氮收获指数分别较M_(1)处理增加16.49%、11.09%、4.86%和4.72%,较M_(2)处理增加21.31%、15.19%、5.32%和18.60%;M_(4)处理较M_(1)处理增产9.01%和6.78%,较M_(2)处理增产11.43%和12.10%,实现产量提升的同时显著改善小麦籽粒蛋白品质。综上,60%缓释掺混肥基施和40%缓释掺混肥返青期追施有助于实现小麦的高产优质高效生产,适宜在沿淮下游稻茬麦区推广应用。

夜间增温对灌浆期高温胁迫下小麦干物质及灌浆特性的影响

为了解灌浆期高温胁迫下小麦生产力对不同阶段夜间增温的反应,以对温度敏感性不同的两个小麦品种扬麦18(春性品种)和烟农19(半冬性品种)为试验材料,采用可移动塑料增温棚,于2021-2022年对小麦进行不同阶段夜间增温[分蘖期-拔节期增温(W T-J N)、拔节期-孕穗期增温(W J-B N)和孕穗期-开花期增温(W B-A N)]及灌浆期高温胁迫处理,比较分析了不同处理下小麦干物质积累及灌浆特性的差异。结果表明,W T-J N和W J-B N处理主要通过缩短小麦播种-开花的时长,延长灌浆期天数,增加花前干物质转运量、花后干物质积累量和花后干物质积累贡献率,进而提高了开花期和成熟期干物质积累量;促进了干物质在成熟期穗轴+颖壳和籽粒中的积累,降低了小麦茎鞘+叶片中的积累量,增产3.08%~7.62%。灌浆期高温胁迫显著降低了两个品种的产量,而与灌浆期高温胁迫处理(NH)相比,W T-J H和W J-B H处理增产1.21%~6.05%。与不增温处理(NN)相比,在W T-J N和W J-B N处理下两个小麦品种的灌浆期粒重及灌浆速率均提高,W B-A N和NH处理则降低了小麦灌浆参数。这说明分蘖期-拔节期和拔节期-孕穗期夜间增温可提高小麦开花期和成熟期的干物质积累量,促进小麦籽粒灌浆,缓解灌浆期高温胁迫对小麦生产力的不利影响,有助于小麦产量形成。

气相旋转换热器壳程强化传热数值模拟

目前,针对大批量谷物干燥的换热器种类较少及现有换热器换热量小、换热效率和能源利用率低等问题,在前人研究的基础上改进了气相旋转换热器结构,并改变螺旋叶片螺距来强化壳程传热。采用计算流体力学软件FLUENT数值模拟方法,对气相旋转换热器壳程进行传热特性分析,得到气相旋转换热器壳程流场在两种螺距的螺旋叶片结构下的压力云图、温度云图和流体速度矢量图,并对比不同流量条件下以两种螺旋叶片螺距为变量的壳程压降、壳程出口温度。研究结果表明:在壳程进口流速为4m/s、进口温度为100℃工况下,对比螺旋叶片螺距为277.5mm及壳程螺距为412mm的螺旋叶片,壳程压降增加30.1%,努尔赛数提高为40.7%。

5H-2谷物烘干机干燥箱多孔角状盒的设计与试验

为改善5H-2谷物烘干机的干燥性能,将原有角状盒改造为多孔角状盒。通过Fluent对多孔角状盒的干燥段气流场进行仿真分析,对比空载条件下干燥箱内部温度场变化情况,结果表明,装有多孔角状盒的干燥箱内部温度场较原有角状盒的分布更趋均匀。选择早稻‘中早35’稻谷,在5H-2谷物烘干机上安装多孔角状盒开展烘干试验,设置热风干燥温度为65℃,风速为8 m/s,干燥缓苏比为1∶2,结果装有多孔角状盒的烘干机干燥速率为0.798%/h~1.002%/h,烘干后爆腰增率为7.4%~10.2%,相比原有角状盒谷物烘干机,其干燥速率提高了12.1%~21.2%,爆腰增率降低了1.9%~5.1%。