A waste heat boiler refers to a boiler that uses waste heat from exhaust gas, waste or waste liquid in various industrial processes and the heat generated by the combustion of combustible substances to heat water to a certain temperature. Oil-fired boilers, gas-fired boilers, and coal-fired boilers with smoke box and flue waste heat recovery are also called waste heat boilers. Waste heat boilers can produce hot water or steam for use in other sections through waste heat recovery.

　　There are pipe seats for pickling, thermal measurement, water level gauge, water supply, continuous sewage discharge, emergency water discharge, safety valve, air valve, etc., as well as manhole devices, etc. on the drum. The drum is equipped with two spring safety valves; two water level gauges, using a quartz tube type two-color water level gauge, which is convenient for observation and correct indication. Sleeve-type pipe sockets are used in the water inlet pipe holes of the drum and other pipe holes that may have a large temperature difference to avoid cracks near the pipe holes due to thermal fatigue. The boiler drum is provided with a separator for separating steam and water, as well as connecting pipes for boiler feed water and chemical dosing. The drum is equipped with two supports, one is a fixed support and the other is a movable support.

　　The feed water distribution header is composed of a water distribution header and a connecting pipe; the boiler feed water is led from the drum and out of the down tube into the feed water header. In order to ensure that the temperature of each part of the header does not deviate, the water supply header and the lower header are used for water intake The introduction of multiple dispersed downcomers. The collection header is composed of a water outlet header and a connecting pipe. In order to prevent the temperature deviation of each part of the header, the steam-water mixture is introduced into the outlet header by multiple connecting pipes, and then into the drum by the rising pipe. The movable fume hood tube group is composed of an upper header, a lower header, and a tube group. The upper and lower headers are connected by 180 φ45×5 steel pipes, and the lower fume hood is formed by welding flat steel between the tubes. Due to the process, the movable fume hood often needs to move up and down, and there is a gap between the movable fume hood and the furnace mouth section. In order to prevent the high temperature flue gas from leaking out, a water seal groove is made on the upper part of the movable fume hood, and the water seal is adopted. Sealing is to prevent molten slag from splashing into the sealing groove. A slag baffle is arranged at the end of the sealing groove. To facilitate cleaning of debris in the water tank, a cleaning hand hole is also provided on the water sealing groove.

　　is composed of distribution header, lower header, pipe group and upper header. Boiler feed water is drawn from the drum into the distribution header. In order to prevent the temperature deviation of each part of the header, the distribution header and the lower header are introduced by dispersing downcomers. After the water enters the lower header, it is dispersed into 132 φ42×4 The heating surface of the circular flue with a pitch circle of φ2400mm, which is composed of steel pipe and 6mm thick flat steel, then produces a mixture of soda and water that enters the upper header and is introduced into the drum by the riser. In order to prevent the header from the flame area, the lower part of the tube bundle is a U-shaped bend, and the angle between the flue at the furnace mouth section and the horizontal is 55 degrees. In order to prevent the flue from being deformed, a reinforcement ring is provided at an appropriate position on the flue.

　　The flue pipe group of each section of the oblique flue, the oblique second flue, the last flue, and the last flue is composed of a distribution header, a lower header, a tube group, and an upper header. Boiler feed water is drawn from the drum into the distribution header. In order to prevent the temperature deviation of each part of the header, the distribution header and the lower header are introduced by dispersing downcomers. After the water enters the lower header, it will be dispersed into 132 φ42×4 The heating surface of the circular flue with a pitch circle of φ2636mm composed of seamless steel pipes and 6mm thick flat steel, then produces a mixture of soda and water enters the upper header, and is introduced into the drum by the riser.