大型冷却塔夏季日照筒壁温差原型实测与分布准则  

Field measurement and distribution criterion for sunshine temperature difference of large hyperbolic cooling tower

作　　者：吴鸿鑫 杨杰[1] 柯世堂[1] 侯宪安 孙文[3] 葛耀君[4] Wu Hongxin;Yang Jie;Ke Shitang;Hou Xian'an;Sun Wen;Ge Yaojun(Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Northwest Electric Power Design Institute Co.,Ltd.,of China Power Engineering Consulting Group,Xi'an 710065,China;Shandong Electric Power Engineering Consulting Institute Co.,Ltd.,Jinan 250013,China;State Key Laboratory of Civil Engineering Disaster Prevention,Tongji University,Shanghai 200092,China)

机构地区：[1]南京航空航天大学,江苏南京211106 [2]中国电力工程顾问集团西北电力设计院有限公司,陕西西安710065 [3]山东电力工程咨询院有限公司,山东济南250013 [4]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《土木工程学报》2024年第1期45-55,共11页China Civil Engineering Journal

基　　金：国家自然科学基金(51878351);江苏省研究生科研与实践创新计划(KYCX22_0333)。

摘　　要：中国现行规范的夏季日照筒壁温差条款源自20世纪80年代秦岭电厂的单一冷却塔(105m)实测结果,既有条款忽略了不同地域与不同尺度的温差分布影响,同时国际上现有冷却塔夏季日照温差分布准则取值存在差异,亟需开展真实大型冷却塔日照筒壁温差更普适的实测研究。鉴于此,基于预制墙板日照试验实现非接触式红外三维测温技术的有效性校订,以分布于我国“寒冷及严寒地区”的五座不同典型高度的大型冷却塔进行夏季全天候的筒壁温差实测;基于实测数据数理统计,提炼了日照筒壁温差的板内梯度分布、时域演变规律、空间分布模式和向阳内壁特性;在此基础上,量化了夏季日照筒壁温差子午向分布、环向分布、最大温差取值,提炼了囊括向阳内壁的大型冷却塔筒壁温差分布准则。研究发现,我国“寒冷及严寒地区”应考虑日照温度应力;日照筒壁温差沿厚度为三段式梯度分布,沿塔高约为恒值,沿环向为外表面非对称半圆分布,喉部以上向阳内壁具有负温差。研究结论加深了对大型冷却塔日照温差分布的理解,也为规范修订提供实测依据。The current Chinese code of sunshine temperature difference of cooling tower is derived from the measured results of a single cooling tower(105m)in Qinling Power Plant in the 1980s,which ignore the influence of different regions and scales.At the same time,there are differences in the distribution criteria of sunshine temperature difference in different countries,so it is urgent to carry out more field measurement on the sunshine tem-perature difference of real large cooling towers.Firstly,the effectiveness of non-contact in-frared three-dimensional temperature measurement technology was verified based on the sun-shine test of precast concrete slab.Then,the sunshine temperature difference field measure-ment of five large hyperbolic cooling towers with different heights located in"cold and severe cold areas"was conducted.Based on the statistics of the measured data,the gradient distribution,the time domain evolution rule,the spatial distribution pattern and the sunward inner wall characteristics were extracted.Then,the meridional distribution,the circumferential distribution and theemaximum temperature difference werequantified.Finally,the distribution criterion of sunshine temperature difference of large hyperbolic cooling tower considering the sunward inner wall was refined.It is found that the sunshine temperature difference should be considered in"cold and severe cold areas"in China.The distribution criterion for sunshine temperature difference of large hyperbolic cooling tower is three-section gradient distribution along the thickness,approximately constant along the meridional direction,asymmetric trigonometric distribution along the circumferential direction on the outer wall,and negative temperature difference at the sunward inner wall.The paper further clarifies the sunshine temperature difference distribution of large hyperbolic cooling towers,which can provide the reference for the revision of the cooling tower codes.

关 键 词：大型冷却塔 日照筒壁温差 现场实测 分布准则 红外测温 

分 类 号：TU279.741[建筑科学—建筑设计及理论]