Recently, our company has obtained the utility model patent authorization of "a two-stage tube-and-tube heat exchanger". In view of the treatment needs of different industries and the differences in flue gas components, our company has developed a two-stage tube heat exchanger suitable for the lithium battery industry in the details of the comprehensive treatment process of the system, which has laid a good foundation for the long-term stable operation of the system. . The core technology is continuously developed and innovated, injecting new vitality into the development of our company.