New ideas for energy savings – Creative approaches to the utilization of low-temperature heat
Thread Content
New ideas for energy savings – Creative approaches to the utilization of low-temperature heat: In various facilities such as petrochemical refineries and chemical plants, a significant amount of the vapor coming from the tops of towers is cooled using air or water before being separated or stored, and this heat is not properly utilized. Here are some personal suggestions: 1. In the cold northern regions, the heat from heating water can be recovered and used to supply heat to residential areas. 2. Some of the crude oil or cold material can first be heated by exchanging heat with the overhead gas, which not only increases the inlet temperature of the feed oil but also reduces the temperature of the overhead gas entering the air cooler, thereby effectively achieving energy savings and reduced consumption. For example, in a hydrogenation unit, the feed oil can be introduced to exchange heat with the vapor from the top of the distillation tower. This not only increases the inlet temperature of the feed oil, thereby raising the exit temperature of the cold material passing through the heat exchanger after reaction and reducing the load on the heater, but it also increases the exit temperature of the reaction products, reducing the risk of ammonium salt crystallization. Additionally, it lowers the temperature of the vapor from the top of the distillation tower entering the air cooler, thus saving energy and reducing consumption. 3. For factories located on islands, the heat from the overhead gases of many aromatic compounds processing units is not fully recovered and is thus wasted; in addition, other forms of energy consumption are high. It is recommended to recover this heat thoroughly for use in seawater desalination, in order to address the problem of freshwater scarcity on these islands. In other words, medium-pressure deionized water or relatively clean water is used as the cooling fluid to exchange heat with the gas at the top of the tower, heating the water to above 110°C; thereafter, seawater is introduced, and it vaporizes under normal pressure to produce steam, thereby achieving the purpose of seawater desalination. 4. Utilization of low-temperature heat for power generation.
This one of yours is also low-temperature heat recovery~~~ This is the trend~~~
It is dreams that give rise to inventions and creations.
This isn’t called low-temperature fever; then what is low-temperature fever? Trends are inevitable, but few actually do this; the key lies in the selection of heat exchangers, which also determines the success or failure of this low-temperature heat recovery process!
Currently, there are many studies on such low-grade waste heat recovery devices both domestically and internationally, and they have been put into industrial use, including in power generation and waste heat boilers.
Yes, but not many make good use of it. Most of them are renovations of old factories, making implementation quite difficult. At the current stage, investment companies are relatively involved in investing in private enterprises.