The economizer is a device installed in the lower part of the flue at the tail of the boiler to recover waste heat, heating the boiler feed water into the heating surface of saturated water under the pressure of the drum. It absorbs the heat of low-temperature flue gas, reduces the exhaust temperature of the flue gas, saves energy and improves efficiency, so it is called the economizer.

The tower is a process equipment of cylindrical welding structure, which is composed of a cylinder, a head(or a cover) and a support. It is a non-standard equipment specially designed and manufactured for certain production process requirements. The tower is an upright equipment used for distillation, purification, absorption, rectification and other chemical unit operations, and is widely used for mass and heat transfer between gas-liquid and liquid-liquid phase.

The primary cooler is a device for cooling the gas. It has an upright rectangular housing, and the cooling water pipe is arranged horizontally at a 3° angle from the horizontal plane.

Spiral plate heat exchanger is one kind of heat transmission equipment with higher heat transmission efficiency through spiral channel for heat transmission.It is a heat exchanger made of two parallel metal plate rolls into two spiral channels, and heat exchange between hot and cold fluids through the spiral plate wall.

An economizer is an energy-saving device commonly used in industrial equipment to recover waste heat from exhaust gases or other sources. It is often installed in boiler systems, where it preheats feedwater or air, reducing energy consumption and improving overall system efficiency. By utilizing otherwise wasted heat, economizers help cut fuel usage, leading to cost savings and enhanced performance.