Papers by Keyword: Cogeneration

Abstract: Mainly introduced the Midway – Sunset and Cymrci heavy oilfield heat and power technological processes and the environmental protection and economic benefit from it. The advice of application of heat and power technology was given according to our Oil field characteristics and different conditions.

Abstract: The modern society is, nowadays, facing two major problems: the energy sources depletion and the degradation of the ecologic system because of wastes rejection. The energetic valorization of wastes contributes on the resolution of both problems. In the present work, a feasibility study of an industrial pilot scale installation for the production of biodiesel from waste grease traps is lead. The installation is meant to transform 1000 tons of fat trap grease per year to biodiesel by transesterification. The daily production of the unit reaches 3200 l of biodiesel. All necessary equipments were sized following process engineering design and based on lab scale optimization experiments. Installation energy balance was also realized and it showed that the energy required for the installation functioning does not exceed 3.5% of the heating value of produced biodiesel.

Abstract: Electricity and high-temperature heating steam are the products of marine diesel enginecogeneration system, and the heat-electricity cost allocation ratio impact cogeneration systemoptimization directly. This paper described several existing cost allocation methods, and applied thereduced exergy method to specific marine diesel engine cogeneration system, then, established thecost allocation model to derive the detailed process and results of calculating heat-electricity costallocation ratio, and draw an conclusion that the reduced exergy method is the most reasonablemethod of cost allocation.

Abstract: More and more countries are focusing on the lack of resources with the consumption of large quantities of fossil energy. The Chinese government is actively promoting the policies related to the transformation of the energy structure which will increase the proportion of clean energy consumption and reduce the proportion of fossil energy consumption in order to relieve the pressure on domestic energy. Interest in the generation of biogas from agricultural residues is increasing rapidly due to its climate benefits. This article is committed to analysis the economic performance of the biogas cogeneration energy supply system of livestock and poultry breeding plants in southern China. The model of the biogas cogeneration energy supply system of livestock and poultry breeding plants in southern China and the advices to the government will also been proposed as a result. According to the results, biogas cogeneration system is feasible in economy with reasonable device configuration and operating strategy.

Abstract: It is quite convenient and flexible to adopt the equivalent enthalpy drop method, in order to analyze a thermal system. In this report, a 330MW cogeneration unit will be chosen, as a case in point, to provide quantitative calculation and qualitative analysis in both global and local aspects. According to our research, this cogeneration unit is designed to operate in a double pumping status. It has such properties as follows: Under 85%BMCR double pumping condition, its highest efficiency of power generation is obtained. In pure condensing conditions with around 70% load, the steam consumption rate reaches minimal level. The reason for this phenomenon lies in the maximal net equivalent enthalpy drop of new steam, although with 70% load, the power generation efficiency is much lower than that in rated pure condensing conditions.

Abstract: A simple and convenient model to analyze the composition of the syngas has been implemented. We collect thermodynamic properties data from JANAF tables and Turns’ book. By regression analysis the Gibb’s energy functions of temperature were got. Through these functions, the equilibrium constants as functions of temperature can be deduced for the related chemical reaction in gasification process. With the equilibrium constants, the model to calculate the equilibrium composition for pure carbon gasification has been established. The model was improved from considering only isothermal reaction to including reaction heat balance and then finally with fully energy balance consideration. Since the model has been implemented on general software Excel, it will be very easy for users to apply in further study. Finally, we show how precise the estimation could be by doing comparison with early study and utilize this tool to analyze the heat balance for a specific IGCC cogeneration power plant.

Abstract: This paper is to investigate the thermodynamic feasibility of cogeneration gas/steam combined cycle, in which a computer program, called “Cogeneration Design" has been developed using MATLAB (v7.8) for the analysis. In this cycle one can take advantage of the thermal energy to produce steam which can be used in some small and medium-sized factories such as dairy , juice, soap, paper factories, as well as in desalination plants and other industrial applications need hot water or steam. Here, the thermodynamic analysis is carried out according to three cases, (1)non condensing steam turbine, (2) condensing steam turbine, (3)extraction condensing steam turbine. The results obtained show a difference between the three studied cases, in which the overall efficiency is the highest for case (1), equal 52.82 %, then for case (3), equal 49.13 %, then for case (2), equal 45.31 %.

Abstract: The research intends to investigate the energetic performances of Organic Rankine Cycles (ORCs) for the exploitation of the biomass resulting from agricultural residues. To this purpose, a parametric analysis has been carried out. Saturated and superheated conditions at the turbine inlet have been imposed and the effect of the internal regeneration on plant performances has been studied. The results highlight that ORC plants represent an interesting and sustainable solution for small-scale and decentralised power production. Moreover, the analysis shows the significant impact of the temperature and internal regeneration technique on the performances of the biomass power plants.

Abstract: 30 MW straw power turbines are most suitable in the major corn producing areas in Northeast China. This paper takes straw power plants that are already used in practice as examples to demonstrate the technological and economical analysis of straw power-generating projects. The research results show that straw cogeneration is advantageous in energy utilization rate, economic profits, and etc.

Abstract: It is analyzed in the paper that the production and composition of waste gas, such blowing gas, associated in the chemical production of the chemical enterprise in Shandong. The calorific value of the waste gas is calculated. Thermoelectricity cogeneration is realizable with using the waste gas as fuel. The scale remaining heat generate electricity is determined. The types of main equipment are discussed. The technical process of cogeneration using chemical waste gas is analyzed. economic benefit is studied in detail.