【Q&A Question 252】2017.09.10
Thread Content
【Q&A Question 252】September 10, 2017: What are the purposes of fixed drainage and continuous drainage in a drum? (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The answers to the daily questions change, and today’s answers are shown in subsequent questions. For management purposes, if you need to view content from a few days ago, please access it through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum)
The fixed-discharge function is to remove the sludge deposited in the lower header of the water wall, while the continuous-discharge function is to continuously remove the boiler water with the highest salt concentration from near the surface of the boiler water.
Continuous drainage and periodic drainage of boilers are abbreviations for “continuous blowdown” and “periodic blowdown”, respectively. Waste discharge is an operation carried out to ensure that the boiler water meets certain standards, to prevent scaling, to maintain steam quality, and to avoid foaming in the steam-water mixture. There are two meanings to \"serial arrangement\" and \"fixed arrangement\"; one refers to the operation ； Secondly, in terms of process design and common terminology, the continuous blowdown expansion vessels and periodic blowdown expansion vessels are sometimes abbreviated as continuous blowdown and periodic blowdown.
It is to ensure that the water in the boiler meets certain standards, prevent scaling, and maintain the quality of the steam
The purpose of continuous drainage is to continuously remove the dissolved salts in the boiler water. The purpose of regular blowdown is to periodically remove sediments (slag) from the boiler water. Depending on their purpose, they are installed in different locations; the series ones are usually placed near the evaporation surface of the drum. The fixed drain is generally located at the lowest part of the evaporation equipment.
The fixed-drain function is to remove the sludge deposited in the lower header of the water wall, while continuous drainage involves continuously removing the boiler water with the highest salt concentration from near the surface of the boiler water.
The regular drainage function is to remove the sludge that has settled in the lower header of the water wall. Continuous drainage involves continuously removing the boiler water with the highest salt concentration from near the surface of the boiler water.
The fixed-discharge function is to remove the sludge deposited in the lower header of the water wall, while continuous discharge involves continuously removing the boiler water with the highest salt concentration from near the surface of the boiler water.
Regular drainage is used to remove impurities from the bottom of the boiler water, while continuous drainage is used to remove boiler water with a high salt concentration from within the drum
Continuous discharge constitutes a type of surface discharge; it involves releasing boiler water with a high salt concentration from the surface, thereby keeping the salt content of the boiler water within acceptable limits. This helps to reduce boiler water expansion and foaming, as well as the humidity and salt content of the steam, and it also helps to minimize scaling in the evaporation tubes； Regular sewage discharge is mainly to remove the sediments formed in the water due to the hardness salts generated after chemical addition. The sewage discharge time is determined based on the results of water quality tests. The scheduled discharge usually takes place every 8 hours.