机械5

F70螺旋板式换热器设计 摘要 换热器在许多工业部门中都有应用，而且非常广泛，例如，石油化工、冶金、制冷、动力等各个领域，在国民经济生产中至关重要。螺旋板式换热器是一种新型换热器，传热效率高，运行稳定，可多台机组运行，适用于蒸汽－蒸汽、蒸汽－液体、液体－液体的传热。 根据任务书的要求，本次的设计课题是F70螺旋板式换热器。螺旋板式换热器相较于其他换热器的优点：1、传热效率高；2、有效回收低温热能；3、运行可靠性强；4、可多台组合使用；5、阻力小；等等。为了确保换热器的强度和使用时间长度,需要设计合理的结构，因此合理的结构需要考虑材料、压力、温度、壁温、污染条件、流体性质、维护、清洁等因素。其中主要的过程有主体的结构设计，材料选择及零部件结构设计，强度计算与校核以及加工工艺、装配程序、安全防腐等。在工程设计过程中，即使是相同形式的换热器结构也不尽相同，因为它们的使用方式不同。我们也应尽可能选择定性产品范围，或者根据客服特定需求来设计,从而达到令人满意的工艺条件。 关键词：螺旋板；结构设计；换热器；强度校核 ABSTRACT Heat excha
ngers are widely used i
n ma
ny i
ndustrial sectors, such as petrochemical i
ndustry, metallurgy, refrigeratio
n, power a
nd other fields, which are very importa
nt i
n
natio
nal eco
nomic productio
n. Spiral plate heat excha
nger is a
new type of heat excha
nger with high heat tra
nsfer efficie
ncy a
nd stable operatio
n. It ca
n be operated by multiple u
nits. It is suitable for heat tra
nsfer of steam-steam, steam-liquid a
nd liquid-liquid. Accordi
ng to the requireme
nts of the task book, the desig
n topic of this project is F70 spiral plate heat excha
nger. Compared with other heat excha
ngers, spiral plate heat excha
ngers have the followi
ng adva
ntages: 1. high heat tra
nsfer efficie
ncy; 2. effective recovery of low-temperature heat e
nergy; 3. stro
ng operatio
nal reliability; 4. multiple combi
natio
n; 5. low resista
nce; a
nd so o
n. I
n order to e
nsure the stre
ngth of heat excha
nger a
nd the le
ngth of service time, it is
necessary to desig
n a reaso
nable structure, so reaso
nable structure
needs to co
nsider material, pressure, temperature, wall temperature, pollutio
n co
nditio
ns, fluid properties, mai
nte
na
nce, clea
ni
ng a
nd other factors. The mai
n processes i
nclude the structure desig
n of the mai
n body, material selectio
n a
nd compo
ne
nt structure desig
n, stre
ngth calculatio
n a
nd checki
ng, as well as processi
ng tech
nology, assembly procedures, safety a
nd corrosio
n protectio
n, etc. I
n the process of E
ngi
neeri
ng desig
n, eve
n the same heat excha
nger structure is
not the same, because they are used i
n differe
nt ways. We should also choose the ra
nge of qualitative products as far as possible, or desig
n accordi
ng to the specific
needs of customer service, so as to achieve satisfactory process co
nditio
ns. Key words：Spiral plate; Structural desig
n; Heat excha
nger; Stre
ngth check 目录 1概论1 1.1螺旋板式换热的研究背景1 1.2螺旋板式换热器现状和发展2 1.3螺旋板式换热器的结构2 1.3.1结构特点2 1.3.2结构型式4 1.4设计方向6 2设计方案的确定7 2.1螺旋板式换热器的选型和流道布置7 2.2流速的选择7 2.3螺旋中心直径和螺旋板宽度的选择7 2.4最合适的出口温度设置7 2.5确定设计方案原则8 3螺旋板式换热器的计算9 3.1传热工艺的计算9 3.1.1传热量Q 9 3.1.2.冷却水出口温度9 3.1.3.螺旋通道截面积与当量直径的计算10 3.1.4.雷诺数和普兰特数11 3.1.5.给热系数的计算11 3.1.6.总传热系数K 12 3.1.7.对数平均温度差12 3.1.8.传热面积13 3.1.9.螺旋通道的计算13 3.1.10.螺旋圈数和螺旋体外径的验算13 3.2.压差的计算14 4螺旋板强度、挠度计算与校核15 4.1强度计算15 4.2螺旋板挠度16 4.3校核螺旋板换热器的稳定性16 5螺旋板换热器的结构尺寸及加工方法18 5.1密封结构18 5.2换热器外壳19 5.3定矩柱的尺寸19 5.4进出口接管的直径20 5.5中心隔板尺寸20 5.6螺旋板式换热器的加工方法21 5.7防腐设计23 5.8螺旋板式换热器设计参数23 总结24 参考文献25 致谢26