**English Translation:**
**Faroli Wall-Hung Boiler Technical Q&A: Principle and Advantages/Disadvantages of Flue Gas Baffle Regulation**
Flue gas baffle regulation is a widely used method for reheating steam temperature control. The flue gas baffle is typically located in the vertical duct between the economizer and the air preheater in the tail-end convective flue gas passage. Before the baffle, there are low-temperature convective superheaters and low-temperature reheaters arranged. The baffle can be manually or automatically controlled. When the load changes, adjusting the baffle opening can change the flue gas flow through the reheater, thereby achieving the purpose of regulating the reheated steam temperature. For example, when the load decreases, increasing the opening of the flue gas baffle on the reheater side increases the flue gas flow through the reheater side, which raises the reheated steam temperature. This regulation method has the advantages of simple structure and convenient operation. The main disadvantage is that the relationship between baffle opening and steam temperature change is not linear. During regulation, it has a certain impact on the main steam temperature, and it is generally only effective within an opening range of 0% to 40%. Additionally, since the baffle is installed in the flue, it must be made of heat-resistant steel plates to prevent thermal deformation of the baffle. The sensitivity of steam temperature regulation by baffle is also relatively poor, so it is usually recommended to be used in conjunction with other regulation methods.
**Source:** Beijing Faroli Wall-Hung Boiler Repair Phone [http://blog.sina.com.cn/faluolibigualu](http://blog.sina.com.cn/faluolibigualu)