【Q&A】May 18, 2017
Thread Content
Q: What are the consequences of scaling in heat exchange equipment? Answer: (A) It increases the heat transfer resistance of the heat exchanger, reduces the amount of heat transferred, and thus forces an increase in the heat transfer area or leads to energy waste ； (B) It reduces the flow area of the fluid, resulting in an increase in the power required for transportation ； (C) It causes a reduction in heat transfer, resulting in failure to meet the process parameter requirements, until unplanned production shutdowns occur ； (D) Increase the cleaning workload during major overhauls, prolonging the equipment maintenance time ； (E) It causes under-scale corrosion and perforation in the pipes, directly threatening the normal operation of production. http://bbs.hcbbs.com/static/image/hrline/4.gif Haichuan Network’s special Labor Day event, “Remembering Glorious Moments”, eagerly awaits your participation. http://bbs.hcbbs.com/thread-1774529-1-1.html (Source: Haichuan Chemical Forum) Compilation post for Haichuan Network’s special Labor Day event, “Remembering Glorious Moments”. http://bbs.hcbbs.com/thread-1774532-1-1.html (Source: Haichuan Chemical Forum) Voting phase 1 of the Creative Ideas Contest (move your mouse to change the results). http://bbs.hcbbs.com/thread-1776507-1-1.html
The formation of scale on heat exchange equipment not only leads to energy waste but also causes problems during the operation of the equipment. This is manifested in the fact that the presence of scale increases the heat transfer resistance of the heat exchanger, reducing the amount of heat transferred; as a result, it is necessary to increase the heat transfer area of the heat exchanger or else energy will be wasted； It reduces the flow area of the fluid, resulting in an increase in the power required for transportation ； This results in a decrease in the amount of heat transferred, failing to meet the required process parameters, and ultimately leading to unplanned production shutdowns ； Increase the cleaning workload during major overhauls and extend the equipment maintenance time ； This leads to under-scale corrosion and perforation of the pipes, directly threatening the normal operation of production.
The heat exchange efficiency decreases, increasing energy consumption
The heat exchange efficiency is poor, and the system pressure difference increases
It reduces the heat transfer efficiency of the heat exchanger. Scaling also causes corrosion of the equipment, shortening its service life. In severe cases, scaling can block the cooling tubes, reducing the cross-sectional area for water flow and increasing the flow resistance, thereby increasing the amount of circulating water needed
Due to the very low thermal conductivity of the dirt layer, the heat transfer resistance increases, thereby reducing the heat transfer efficiency of the heat exchange equipment； When a scale layer forms on the surface of heat exchange equipment, the flow area of the fluid channels within that equipment decreases, which increases the resistance to fluid flow through the equipment. As a result, more pump power is required, leading to increased production costs.
1. Affects heat transfer efficiency and reduces production efficiency. 2. Intensifies corrosion, potentially leading to pitting and perforation. 3. Requires shutdowns for cleaning, which affects continuous production and efficiency
Answer: 1. The heat transfer resistance of the heat exchanger increases, resulting in a decrease in the amount of heat transferred, which forces an increase in the heat transfer area of the heat exchanger or leads to energy waste; 2. It reduces the flow area of the fluid, thereby increasing the power required for transportation; 3. This results in a decrease in the amount of heat transferred, failing to meet the design requirements. 4. It increases the cleaning workload and prolongs the time required for maintenance and cleaning. 5. Pipe corrosion and perforation pose a threat to the normal operation of production. .
Firstly, the dirt layer has a very low thermal conductivity, which increases the heat transfer resistance and reduces the heat transfer efficiency of the heat exchange equipment. Secondly, when a scale layer forms on the surface of the heat exchange equipment, the flow area of the fluid channels within the equipment decreases, which increases the resistance to fluid flow through the equipment. As a result, more pump power is required, leading to increased production costs.
1) It increases the heat transfer resistance of the heat exchanger, reduces the amount of heat transferred, and thus necessitates an increase in the heat transfer area or results in energy waste； (2) Reduces the flow area for the fluid, resulting in an increase in conveying power ； (3) It causes a reduction in heat transfer, resulting in failure to meet the process parameter requirements, until unplanned production shutdowns occur ； (4) Increase the cleaning workload during major overhauls, prolonging the equipment maintenance time ； (5) It causes under-scale corrosion and perforation in the pipes, directly threatening the normal operation of production