小麦制粉车间空压机余热综合利用系统设计与应用

在现有小麦制粉工艺及设备现状基础上,对小麦制粉车间空压机余热与麸皮烘干、温水润麦所需的热量以及员工生活用热进行了计算分析,计算出理论可回收热能与车间生产、员工生活所需热能,设计了空压机余热综合利用系统,分析论证了热能回收方案。将空压机运行过程中产生的热能高效回收并加以利用,将余热置换成热水,夏季用于车间麸皮烘干的能源,冬季用于温水润麦或办公、职工公寓供暖,平时还可以用于员工洗浴。若能将空压机余热全部回收利用,一个600 t/d的面粉车间每年约可节约电费27万元,降低企业运营成本,提高企业市场竞争力。     

信息动态

我们公司结合实际,对6台大功率空气压缩机进行了余热回收改造.把空压机正常运行中产生的热量通过油/水转换,得到温度较高的热水,用于空调室车间加温加湿以及冬季附房取暖.改造后试运行中,发现加装余热回收的空压机油温在70℃左右,而散热风机还在全负荷运行.为此,我们决定把空压机的散热风机进行变频改造,使改造后散热风机根据设定的油温自动调节风机转速,以达到充分回收热能,节约电能.     

空气压缩机散热风机的变频改造

<正>我们公司结合实际,对6台大功率空气压缩机进行了余热回收改造。把空压机正常运行中产生的热量通过油/水转换,得到温度较高的热水,用于空调室车间加温加湿以及冬季附房取暖。改造后试运行中,发现加装余热回收的空压机油温在70℃左右,而散热风机还在全负荷运行。为此,我们决定把空压机的散热风机进行变频改造,使改造后散热风机根据设定的油温自动调节风机转速,以达到充分回收热能,节约电能。     

造纸厂空压机噪声分析与治理

分析了造纸厂空压机噪声声源的组成及频率特性。介绍了空压机噪声控制与治理的基本方法,即根据不同的声源部位,采取消声、吸声、隔声等综合控制措施。通过造纸厂空压机噪声治理的实例,说明了空压机噪声治理的必要性和有效性。     

用于饮料超高温杀菌的空压机热能回收系统设计

针对空压机使用过程中大部分能量被浪费的情况,提出了将空压机热能回收用于UHT杀菌系统中料液预热的方案,设计了一种空压机热能回收系统。该热能回收系统采用热交换器和保温管道实现了空压机与UHT杀菌系统的联接,并利用水进行循环。空压机的热能通过热交换器进行回收,并经过保温管道输送到饮料UHT杀菌系统处,再利用热交换器用于饮料料液UHT杀菌的预热过程。经过实际改造应用和计算,该热能回收系统每天可减少能耗9 500 k W·h,节约蒸气15 t,每年可节省开支93.4万元。研究结果表明,该空压机热能回收系统具有很好的实用价值和显著的经济效益。     

生物制药企业空压站余热回收的可行性

文章从兰州生物制品研究所有限责任公司L501车间空压站螺杆空压机的运行现状、空调系统的运行特点出发,结合当前的余热回收技术等方面提出了将空压站余热回收后用于空调新风系统预热这一设想,并对此设想进行了可行性论证和经济性分析,同时倡导并追求绿色能源高效回收和循环利用的理念。     

制浆造纸蒸发温水余热的回收利用

通过对制浆造纸生产工艺用能的分析,冬季二级泵房供水温度不到20℃,与正常供水温度25~30℃相比相差5~10℃,造成冬季整个生产系统能耗高。而碱回收蒸发板式冷凝器产生的温水(水温45~50℃)大部分通过冷却塔进行冷却降温至30℃以下再循环使用,温水的余热散发到大气中,造成余热损失,且增加循环水站冷却塔系统能耗。现提出蒸发温水余热回收利用的一种方式,将蒸发温水回流到二级泵房清水池,提高冬季生产用水水温,降低生产能耗,节能减排效果显著。     

碱回收车间燃烧工段的技术改造与运行实践

碱回收车间燃烧工段的技术改造与运行实践⒇郭成林（黑龙江省带岭林业实验局造纸厂１５３１０６）关键词碱回收旋风分离器文丘里工艺管线技术改造运行实践带岭造纸厂以伐区剩余物为主要原料，设计能力为年产牛皮箱纸板１０２００吨，其中碱回收车间是省林业设计研究院设计...     

集中控制系统在空气压缩站节能改造中的应用

文章对空压机的运行特点以及节能优化改进措施进行了阐述,着重介绍了集中控制技术中变频调速及余热回收技术的节能优化,并结合实际案例对空压机节能改造及节能效果进行了分析。     

空压机热能回收与应用的探讨

针对本企业空气压缩机大量余热散失浪费的现状,提出了一种余热利用方案。压缩机压缩空气产生大量的热能,通过冷却系统散发到大气中。如果回收利用,可帮助企业节约能源消耗,又能够间接减少CO2的排放,有着良好的经济、环境和社会效益。针对本企业4台Atlas copco无油螺杆空压机及现场利用能源情况进行分析,提出热能回收的改造方案。通过回收空压机热能,用于工厂采暖、生活热水和软化水加热等使用,达到节省能源和节约成本费用。空压机热能回收(按2台空压机功率400KW),每年可以节省107万元,项目改造的回收期为13个月。     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.     

低温带皮菜籽粕微粉的不同粒级部分的功能特性

为研究低温带皮菜籽粕微粉的不同粒级部分的功能特性,以经低温脱脂的带皮菜籽粕为原料,经微粉碎后筛分成212~425μm、150~212μm和106~150μm的3个不同粒级的微粉样品,检测这些样品的吸水性、吸油性、乳化性和乳化稳定性、蛋白质体外消化率。结果表明:1 3个不同粒级的微粉样品之间的粗纤维含量存在显著差异,表明三者的结构组成成分有一定差异。23个微粉样品的乳化活性和乳化稳定性随粒度级别的减小而显著增加(P0.01)。33个微粉样品的蛋白质体外消化率随粒度级别的减小而显著增加(P0.01)。4不同粒级带皮菜籽粕微粉样品的吸水性与吸油性受其结构组成物质不同和粒度的双重影响,与粒度的相关性不明显。     

Microbiology of food taints

Fresh and processed foods are often spoilt by the presence of undesirable flavours and odours caused by microbial action. The aim of this paper is to review the current knowledge of microbiologically induced taints that occur in a wide range of foodstuffs, including meats, poultry, fish, crustaceans, milk, dairy products, fruits, vegetables, cereals and cereal products. Examples have been chosen where the compounds responsible for the taint have been identified and sufficient data obtained to demonstrate the involvement of microorganisms. However, in some cases the full identity of the causative organism may not have been elucidated. The types of microorganisms covered by this review include bacteria, fungi, yeasts, actinomycetes and cyanobacteria. Although cyanobacteria do not in general infect foods, their presence in aqueous systems and water supplies can lead to off-flavours in aquatic organisms and processed foodstuffs. Several examples of each of these processes are discussed. Wherever possible, the likely biosynthetic pathway used by the microorganism to produce the offending compound in a foodstuff is indicated.     

Analysis for organic residues from aids to polymerization used to make plastics intended for food contact

Polymers intended for food contact use have been analysed for organic residues which could be attributed to a range of substances employed as polymerization aids (e.g. initiators and catalysts). A wide range of polymers was extracted with solvents and the extracts analysed by gas chromatography-mass spectrometry (GC-MS). The overwhelming majority of substances identified were not derived from aids to polymerization but were oligomers, additives and adventitious contaminants. However, a small number of substances were identified as initiator residues. These included tetramethylsuccinonitrile (TMSN) which was observed in two polymers and it derived from recombination of two azobisisobutyronitrile (AIBN) initiator radicals. Methyl benzoate, benzoic acid, biphenyl and phenyl benzoate were detected in one poly(methyl methacrylate) sample and in two polyvinylchlorides and they are thought to be derived from benzoyl peroxide initiator. TMSN was subsequently targeted for analysis of poly-(methyl methacrylate) plastics using proton nuclear magnetic resonance spectrometry (¹     

Tests of potential functional barriers for laminated multilayer food packages. Part II: Medium molecular weight permeants

Experiments were performed to characterize the kinetics of the permeation of different medium molecular weight model permeants: bisphenol A, warfarin and anthracene, from liquid paraffin, through a surrogate potential functional barrier (25 microns-thick orientated polypropylene--OPP) into the food simulants olive oil and 3% (w/v) acetic acid. The characterization of permeation kinetics generally observed the permeation models previously reported to explain the experimental permeation results obtained for a low molecular weight group of model permeants. In general, the model permeants exhibited behaviour consistent with their relative molecular weights with respect to (a) the time taken to attain steady-state permeation into the food simulant in which they were more soluble, (b) their subsequent steady-state permeation rates, and (c) their partition between liquid paraffin and the OPP membrane.     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. I: Interlaboratory studies of methods of analysis

This paper describes the first part of a project undertaken to develop mussel reference materials for Paralytic Shellfish Poisoning (PSP) toxins. Two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin (STX) and decarbamoyl-saxitoxin (dc-STX) in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the second part of the project: the certification exercise. In the first study, 18 laboratories were asked to measure STX and dc-STX in rehydrated lyophilized mussel material and to identify as many other PSP toxins as possible with a method of their choice. In the second interlaboratory study, 15 laboratories were additionally asked to determine quantitatively STX and dc-STX in rehydrated lyophilized mussel and in a saxitoxin-enriched mussel material. The first study revealed that three out of four postcolumn derivatization methods and one pre-column derivatization method sufficed in principle to determine STX and dc-STX. Most participants (13 of 18) obtained acceptable calibration curves and recoveries. Saxitoxin was hardly detected in the rehydrated lyophilized mussels and results obtained for dc-STX yielded a CV of 58% at a mass fraction of 1.86 mg/kg. Most participants (14 out of 18) identified gonyautoxin-5 (GTX-5) in a hydrolysed extract provided. The first study led to provisional criteria for linearity, recovery and separation. The second study revealed that 6 out of 15 laboratories were able to meet these criteria. Results obtained for dc-STX yielded a CV of 19% at a mass fraction of 3.49mg/kg. Results obtained for STX in the saxitoxin-enriched material yielded a CV of 19% at a mass fraction of 0.34mg/kg. Saxitoxin could not be detected in the PSP-positive material. Hydrolysis was useful to confirm the identity of GTX5 and provided indicative information about C1 and C2 toxins in the PSP-positive material. The methods used in the second interlaboratory study showed sufficiently consistent analysis results to undertake a certification exercise to assign certified values for STX and dc-STX in lyophilized mussel.     

Focus on China's Paper Industry

In the English section of this issue, 〈China Paper Newsletters〉 will introduce ＂National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the ＇13th Five-Year Plan＇＂, ＂2013 Annual Report of China＇s Paper Industry＂, and news of projects and other policies.     

Listen to downstream & search for innovation

正Nowadays,textile enterprises are all taking efforts in transformation and upgrading,like improving producing capacity and optimizing production structure to face market downturn.It claimed a higher request to the standard of textile equipments.In the upcoming of ITMA ASIA+CITME 2014exhibition,this magazine have interviewed several branch associations and a series of relative enterprises,to summarize industrial developing status