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北方寒冷地区沼气池保温技术及效益分析 总被引：1，自引：0，他引：1
吉林省位于北方寒冷地区,具有夏季高温多雨、冬季漫长严寒、春秋短促凉爽的特点。因受气候影响.沼气发展存在产气率低、使用率低、原料分解率低,沼气使用时间短,综合效益差的问题。据调查,全年产气率平均为0.1m~3/m~3·d,沼气池利用率为50%左右,原料分解率不到30%,沼气使用 相似文献
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为了解决南方地区阴雨天和广大北方地区冬季沼气发酵温度低、产气效率低等问题,本文尝试设计以太阳能集热、空气源热泵、电加热并联的沼气发酵增温系统.这三种加热技术互补使用可满足不同天气条件下沼气发酵的增温需求.太阳能集热器作为增温系统的主要加热装置.当太阳辐射不能满足温度需求时,使用空气能热泵加热.特殊情况下使用电加热装置增温.为满足恒温发酵,该系统配备了以单片机为核心的自动控制器,分别包括温度检测电路单元、温控电路单元、键盘输入单元、显示单元和报警单元.该增温系统实现了沼气池恒温发酵功能,能够在阴雨天和冬季稳定增温,有效的提高沼气池产气效率,减少能源消耗和人员参与. 相似文献
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文章以甘肃省秦安县水泉养殖专业合作社生猪标准化养殖场为例,阐述了智能化沼气工程系统的工艺流程及技术要点,包括酸化池和沼气池的pH值监测系统、智能化进料系统、玻璃钢沼气池加热系统、沼气自动搅拌系统、沼气流量监测系统和互联网远程控制系统.智能化沼气工程技术系统能为沼气发酵创造最佳发酵环境,获得了高效的产气率. 相似文献
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我国农村发展沼气的主要目的,是解决农民的生活燃料和扩大有机肥料。根据农村发酵原料的来源和现状、农民家庭用气和生产用肥的需要,农村制取沼气,主要是采取半连续自然温度发酵工艺和应用混合原料入池。为了研究提高水压式沼气池的产气率,特别是提高冬季产气率,达到全年均衡产气,我们在农牧渔业部成都沼气科学研究所试验场,进行了沼气发酵工艺的试验研究。 相似文献
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针对自然气候温度的变化,影响传统沼气池的产气率和沼气使用率的问题,设计开发了一种新型太阳能恒温沼气反应装置.该装置利用太阳能加热,消除自然气候对发酵的影响,自动控制温度,实现全天候高效发酵,且拆装、维修、移动快捷方便,自动化程度高.通过对该装置运行试验分析,结果表明:该装置结构设计合理、性能优良,发酵速度快,产气率高以及沼气成分中甲烷含量高.该装置有利于促进农村沼气能源新技术的推广,提高农村生物质能的利用率. 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性，认为在缺水不可避免的情况下，对供水进行优化调度可以减小缺水带来的损失，产生较好的减灾效益，特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性，提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献