<section class="" style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"><section class="" style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;">　　烘筒烘燥机的生产效率和热效率都是比较高的，因此在印染工业中得到广泛应用。但是，烘筒烘燥机是接触烘燥，织物表面与内层的温差较大，织物与烘筒表面各点的接触情况也不相同，因此烘燥均匀性较差。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;">　　热风烘燥机的主要优点是利用加热气体接触织物，故烘燥作用比较均匀而缓和，织物所承受的张力小。热风烘燥机可以利用烟道气直接加热或蒸汽、热油间接加热，比只用蒸汽加热的烘筒烘燥机温度高，因此，可满足某些工艺如热定形、焙烘等方面的特殊要求。但热风烘燥机占地面积较大，且热效率较低。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;">　　热风烘燥机的种类较多，按其输送织物的形式，可分为布（针）铗式热风烘燥机、导辊式热风烘燥机、悬挂式热风烘燥机及圆环式烘燥机等四大类；按其工艺用途来分有烘干机、热定形机、焙烘机；按热源来分有蒸汽热风烘燥机、煤气热风烘燥机、烟道气热风烘燥机、液化石油气热风烘燥机、电热热风烘燥机、各种有机载热体热风烘燥机等。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;">　　热风烘燥就是由风机以强制对流方式，使加热过的热空气在烘房内把热能传给湿织物，并带走织物上汽化的水蒸气。热风既是载热体，又是载湿体，因此，热风烘燥机的热效率较低。为了提高热风烘燥的效率，必须了解热风烘燥的基本过程。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;">　　在实际生产中，为了降低能耗，提高热风烘燥机的热效率，热风烘燥机常采用以下两种热空气加热循环使用的方法。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;">　　（1）一次加热循环使用，即全机大循环热风烘燥。此方案的热空气加热流程如图5-21所示。从A点补充新鲜空气与烘房中部分回用热空气混合后，在B点经加热器升温至C点，经循环风机输送到烘房内，对织物进行烘燥后，排出烘房至D点，一部分回用，另一部分由排风机排出。</span></p><p style="text-align: center; max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><img src="https://dayaotex-edu.fsh.bcebos.com/v1/dayaotex-edu/5-21.png?authorization=bce-auth-v1%2F59b7a26546d74b64bfd056b483465817%2F2023-06-14T02%3A49%3A11Z%2F-1%2F%2F1d0f31f576ef1ee03c8266f7ccdcf3843cfb6e0403613226588a4bb8091aa98b" data-filename="" style="width: 25%;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"></span><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br></span></p><p style="text-align: center; max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;">　　对热空气采用大循环使用时，烘房温度不会过高，对减少热损失有益。但热空气进入和离开烘房时的温差也不大，加热升温也比较容易。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;">　　（2）多次循环使用，即全机分段循环烘燥。图5-22为多次加热循环的流程图。从A点补充新鲜空气与I室D点返回空气混合后成B点状态，经加热器加热升温至C点状态，由循环风机输送至烘房内，与织物接触变为D状态。一部分空气返回，另一部分空气成为II室的补充空气，与II室的返回空气G混合后变为E状态，经加热器加热升温至F状态，由循环风机送入烘房II，与织物接触变为G状态。依次类推，可以多次加热循环。</span></p><p style="text-align: center; max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><img src="https://dayaotex-edu.fsh.bcebos.com/v1/dayaotex-edu/5-22.png?authorization=bce-auth-v1%2F59b7a26546d74b64bfd056b483465817%2F2023-06-14T02%3A49%3A21Z%2F-1%2F%2Fabebd80a849fc4bafe0a74e9141e1e0898fe5f6f578e2e2d590ab12cc6669ff2" data-filename="" style="width: 25%;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br></span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;">　　采用这种方案，既可避免烘房内的温度过高，又能使最终排出的废气有较高的相对湿度，有效地利用了热能。同时各烘房的温差较小，有利于织物烘燥均匀性和热效率的提高。此外，还可按工艺要求，分别控制各段烘房内的温度、相对湿度和烘燥速率，烘燥效果较理想。目前热风烘燥机广泛使用这种加热循环方式。</span></p><p style="max-inline-size: 100%; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p></section></section><section class="_135editor" data-role="paragraph" id="autoparagraph" style="max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; font-family: 微软雅黑, &quot;Microsoft YaHei&quot;, sans-serif; font-size: 17px; caret-color: rgb(255, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"></p></section>