The outlet temperature of the heater used for desulfurization and denitrification can reach 600 degrees or more. The electric heating tube in the heater can be made of stainless steel 310S. If a better electric heating tube material is required, INC800 can be selected, and the heater barrel material can be selected. The material of stainless steel 304, if the customer's budget is sufficient, the heater cylinder can be made of stainless steel 310S, depending on the situation.