Advanced Materials Research Vols. 724-725

Abstract: This The study is focused on the influence of NaOH ratio, reaction time, reaction temperature to strength of briquette binder. The results show that the NaOH ratio is 3 %, the heating time is 2 h, the heating temperature is 85°C had a great effect on the binder preparation.

Abstract: Catalytic gasification of sawdust biomass was carried out using a specially designed flow-type double beds micro reactor in a two step process: temperature programmed non-catalytic air gasification of biomass was performed in the first bed at 800°C followed by catalytic decomposition gasification of volatile matters (including tars) in the second bed at five different temperatures. The general observation is that the conversion of sawdust biomass increases as the temperature was raised from 750 to 950°C over non-catalyst, raw copper slag or calcined copper slag. High temperature enhances secondary cracking and reforming of tars and heavy hydrocarbons. At the temperature of 950°C, the energy yield (Ey) was 13.2 MJ gas/kg biomass; The energy conversion efficiency (Eff) was 81.05%; The H₂ production was 0.0296 kg/kg biomass; The CO production was 0.6685 kg/kg biomass. Furthermore, improvement in conversion of biomass is observed when copper slag is added in secondary reactor as catalysts. The use of copper slag as catalysts significantly contributes to tar conversion in lighter hydrocarbons.

Abstract: Renewable energy sources such as biomass are becoming more and more important as alternative to fossil fuels. One of the most exciting new sources of biomass is microalgae. One of the major obstacles in the commercial production of microalgae as feedstock for biomass-to-liquid fuels, is the development of energy efficient and cost effective harvesting methods for the separation of micro-algal biomass from its growth medium. The problem of water shortage and lack of energy have become key restricting factors for the economic development of the world. Biomass energy due to its renewability, low pollution and other advantages is considered as the most potential products to alleviate the water pollution and energy crisis. Algae, the third generation of biomass, have many advantages such as wide distribution, high oil content, strong environment adaptability, short growth cycle and low production cost. Thus the use of algae biomass has attracted more and more attention. This paper describes the progress of the algae biomass energy research, the key issues and trends in the industrial process.

Abstract: Microalgae are microscopic heterotrophicautotrophic photosynthesizing organisms with enormous potential as a source of biofuel. In the masses of biomasses, microalgae has the advantages of high lipid, large biomass, short growth cycle and easy cultivation and with microalgae as the raw material. Light condition is crucial to cultivation of microalgae.In this paper, the microalgae strain of Chlorella sp. was supplied in BG11 medium, and Cultivation optimization were experimented. The results were showed that growth of chlorella was associated with a saturated light intensity, light intensity which was suitable for the growth of chlorella was 2000Lux. Growth of chlorella required an appropriate light-dark alternation to facilitate matching of photoreaction of photosynthetic process with dark reaction of photosynthetic, appropriate light-dark photoperiod of illumination time which was suitable for the growth of chlorella was 12:12.

Abstract: The development of biomass and coal co-gasification technology not only helps to alleviate the energyshortage crisis, but also reduces the pollution of fossil fuels to ecological environment. Co-gasification of biomass and coal can overcome in a certain extent tar emerge in biomass gasification, alkali chloride corrosion, low reaction temperature etc, can increase the calorific value of the gasified gas, can also improve the gasification characteristics. However, due to the biomass compositions differences and the gasification technologies differences, there are the different studies results of co-gasification of biomass and coal. This paper summarized and analyzed the biomass and coal co-gasification study literatures, it is conclude that the biomass compositions can enhance the coal gasification reaction if the biomass compositions intensive mixed with the coal compositions. If not, the biomass gasification and the coal gasification would react separately. This conclusion provides a theoretical basis of the biomass and coal co-gasification and accelerates the biomass gasification technologies development.

Abstract: The oxidative stability of castor oil based biodiesel, added different antioxidant, was studied systematacially through pressure differential scanning calorimetry (PDSC), accelerated oxidation test, constant temperature method, programmed temperature method. The result shows after adding antioxidant in castor oil, the generation of hyperoxide and acid value were suffocated for the biodiesel. When the content of antioxidant 300 was 0.6 wt.%, the initiation oxide temperature raised to 197.7°C, the acid value reduced to 1.41, the solubility of oxide reduced to 1.40mg/100mL, and the activity energy of oxidation was 48.18kJ/mol.

Abstract: The effect of temperature on the charcoal yield of cornstalk carbonization was investigated in a flow tube furnace. Thermogravimetic analysis was used to study the combustion characteristics of cornstalk and charcoal in air and O₂/CO₂ atmosphere respectively. Characteristics parameters were calculated and analyzed, including ignition temperature, peak temperature, maximum weight loss rate, burnout temperature, average burning rate and burning characteristics index. Results show that the charcoal yield of carbonization decreases with rising temperature. The combustion characteristics of cornstalk in air atmosphere are better than that in O₂/CO₂ atmosphere. However, the combustion characteristics of charcoal are better in O₂/CO₂ atmosphere.

Abstract: Objective : Cinnamomun amphora(L.)Presl is a kind of one of the important economical tree species and valuable timber species in southern China,It had important meanding to analyze its volatile oil consitituent on expanding its utilization and increasing the added value.Methods:The volatile compounds of Fruit of Cinnamomun amphora(L.)Presl were isolated with steam distillation,and identified by capillary GC/MS /DS and the relative contents of the constitons were detemined by area normalization method. Rusults: 60 volatile components were identified and determined,accounting for 94.69% of the total area of the peaks.Conclusion: The main volatile compounds are: Methyleugenol,Safrene Eucalyptol,Caryophyllene ,Terpineol,Sabinene ,πSelinene ,L-4-terpineol,α-πPinenα-,πTerpieol,Myrcene,Gamma terpinene,πSelinenol,Alloaromadendren,Isoledene,2-Carene,π-Cadinene .

Abstract: This paper firstly analyzes the situation of forest biomass power generation in China. Then the environmental cost of forest biomass power generation is quantitatively accounted in the base of environmental value standard and the advantages of forest biomass power generation are presented through comparing environmental cost between forest biomass power generation and other various power generation forms. In the end, competitive power of forest biomass power generation is preliminary studied and the paper concludes that the competitiveness of forest biomass power generation is reduced automatically without complete internal accounting for environmental cost.

Abstract: Biodiesel is a renewable, biodegradable, and nontoxic fuel. At present, biodiesel is primarily produced in batch reactors in which the required energy is provided by heating accompanied by mechanical mixing. Alternatively, ultrasonic processing is an effective way to attain required mixing while providing the necessary activation energy. Biodiesel was synthesized by soybean oil using ultrasonication and alkali-acid catalysis method. Its structure was characterized by gas chromatograph, and the effects of various factors on transesterification rate were studied. The results show that a biodiesel yield in excess of 97% can be achieved in 30 min, methanol/oil molar ratio of 6:1, 1% of alkaline.