There are several kinds of waste heat boilers

Waste heat boilers are divided into fire tube type and water tube type. Its structure is similar to that of an industrial boiler. The fire tube waste heat boiler has a large water storage capacity, and the steam pressure fluctuates little under the condition that the smoke volume and the steam consumption fluctuate, but its evaporation and steam pressure are constrained by the diameter of the cylinder and the operating conditions. In addition, the pipe end and tube plate are due to low cooling and high temperature stress.

When the temperature of the smoke is high (above 600℃) and the tube plate is thick, this boiler is not suitable, and the water pipe waste heat boiler is suitable. Water tube waste heat boiler has two circulation modes: auxiliary circulation and natural circulation. The flue gas temperature entering the waste heat boiler is an important factor to determine the arrangement of the heating surface of the waste heat boiler.

If the inlet flue gas temperature is 400~900℃, the boiler is mainly set up convection control, and the furnace chamber is not set up; However, there are exceptions when the melting point of the smoke is low, and the cooling chamber should be set up to control the temperature of the inlet smoke into the convection flue, so as to avoid the ash and slag bridging between the convection pipe rows.

When the imported flue gas temperature or exhaust gas combustion temperature is above 1100 ° C, its placement method is not much different from that of general industrial boilers. When the high temperature exhaust gas contains a large amount of accumulative fine ash, the boiler tube row should be vertically placed, and the flue gas should be longitudinally washed at a high smoke speed (about 20 meters/second).