动力锅炉燃烧反应系统的(火用)传递描述

基于对燃烧系统(火用)转换元和输(火用)元组成及传递结构的分析,建立燃烧系统通用(火用)传递模型.依据系统(火用)传递特点、(火用)转换和传递元的性质和作用,定义、设计(火用)转换强度、燃烧产物实际热(火用)与理论热(火用)比、容积产热(火用)强度三个基本评价准则,有效预热权重、无效预热(火用)权重和散热(火用)权重三个辅助评价准则.由基本准则和辅助准则组成的评价体系,可对燃烧系统中能量与能质的利用作出全面评价.综合应用(火用)传递模型和评价准则,即可对燃烧系统进行完整的(火用)传递动态描述.为了获得(火用)传递的定量描述,在建立燃烧系统能量平衡和(火用)平衡方程的基础上,提出常见稳态燃烧系统(火用)传递计算的基本方法,并以计算实例概述了燃烧温度、(火用)传递速率和评价准则的计算要点及结果.

DESCRIPTION IN EXERGY TRANSFER FOR COMBUSTION SYSTEM OF POWER BOILER

Based on the analysis of composition and transferring mechanism for both exergy transfer unit and exergy conversion unit, the general model of exergy transfer was established. According to the analysis of exergy transfer characteristics for the system, the properties and functions of exergy transfer unit, the evaluation criterions are defined and established. The evaluation criterions consist of three primary criterions including exergy transfer intensity, ratio of the combustion production actual thermal exergy with theoretical exergy, and volume thermal exergy intensity. Three secondary evaluation criterions including weighting of effective pre-heat, ineffective pre-heat exergy, and weighting of heat dissipating are also presented. This evaluation system can evaluate the energy quality and quantity utilizing for the sys-tem comprehensively. The approach applying exergy transfer model and evaluation criterions, can describe the whole exergy dynamic state in the combustion system. Moreover, the system exergy transfer calculation method of steady state combustion is developed based on the energy and exergy balance equations, to describe the quantitative analysis of exergy transfer. The calculation examples are provided to summarize the key points and result in calculating the combustion temperature, exergy transfer velocity and evaluation criterions.