The previous technical process of steam generator waste heat recovery is very imprecise and not perfect. The waste heat in the steam generator depends on the blowdown process of the steam generator. The common recovery method generally uses a blowdown expander to collect the blowdown water, and then expands the capacity and depressurizes it to quickly form secondary steam, and then use the waste water generated by the secondary steam The heat does a good job of heating the water.
And there are three problems in this recycling method. First, the sewage discharged from the steam generator still has a lot of energy, which cannot be used reasonably; second, the combustion intensity of the gas steam generator is poor, and the starting pressure is poor. If the temperature of the condensed water is slightly higher, the water supply pump will be formed. Vaporization, can not operate normally; Third, in order to maintain stable production, a large amount of tap water and fuel must be invested.
The following two methods are usually used to deal with the recycling of traditional steam generators.
One is to consider from the aspect of air preheater. The air preheater with the heat pipe as the key heat transfer part is selected, and the heat exchange efficiency can reach more than 98%, which is higher than that of ordinary heat exchangers. This air preheater device is light in design and occupies a small area, only one-third of the ordinary heat exchanger. In addition, it can effectively avoid the acid corrosion of the fluid to the heat exchanger and increase the service life of the heat exchanger.
The second is to start with mixed water recovery and treatment equipment. Sealed and pressurized high-temperature mixed water recovery and treatment equipment can directly heat a part of the relatively high flash steam and high-temperature condensed water, select high-temperature steam-water mixed recovery and directly recover and press it into the steam generator to form steam-use steam- The closed loop system of regenerating steam improves the effective heat utilization rate of steam. It also reduces the loss of electric energy and salt energy, reduces the steam generator load, and reduces a large amount of soft water.
The above content is mainly a brief description of the technical issues of waste heat recovery from steam generators, and it is still necessary to think carefully about specific issues.
Post time: Aug-23-2023
