Rotary GGH soot blowing system is made of AF foam pump material. Rotary GGH heating surface is arranged tightly. The airflow channel is narrow and winding. Fly ash in flue gas is easy to deposit on heating surface. It causes ash blocking, increases airflow resistance and fan power consumption, reduces heat transfer area, reduces hot air temperature, and aggravates corrosion, and affects the normal operation of desulfurization heat exchanger. Therefore, soot blowing system must be set up. Unification. Rotary GGH is usually equipped with compressed air (or steam) purging, on-line high pressure water (8-12 MPa) flushing and off-line large flow low pressure water (about O.5 MPa) flushing devices. These three methods are implemented in the same soot blower. When the rotary GCH works normally, the compressed air soot blowing is operated every shift. When the pressure drop of heat exchanger after soot blowing is still higher than the design value, the high-pressure flushing water is started for on-line flushing. Thus, the dual soot blowing method ensures the soot blowing effect (it is recommended that the high-pressure water be flushed online at least once a month at regular intervals). Large flow and low pressure flushing water is used to flush the heat exchanger when the rotary GGH is out of service and overhaul. The normal speed of GGH is 1.5s/min when it is washed in high pressure or low pressure water. Although dual soot blowing method is adopted, because the low temperature section of rotary GGH is easy to block up, the form of steam soot blowing is being adopted.

Of course, when high sulfur coal is used, the acid dew point of flue gas is higher. In this case, the use of steam soot blowing is not conducive to the heating surface and barrier, and the water brought by the soot steam will aggravate the acid corrosion of the heating surface. If the travel mechanism of the sootblower is jammed, the impact of steam on the part will affect the life of the component. At the same time, the washing water will also condense on the heating surface and dilute the acid dew to dilute acid, thus aggravating corrosion. Although steam soot blowing has the above disadvantages, it has better soot blowing effect than compressed air because of the high steam pressure, high temperature and strong impact. Compressed air has a low water vapor content, but its temperature is lower, and its impact force is lower than that of steam, which has a bad effect on ash removal. In addition, because the steam consumption of soot blowing is large (about 3t/h), and the compressed air system is difficult to bear, it is appropriate to use steam as soot blowing medium than compressed air. Practice has proved that the effect is good. There are three types of rotary GGH flushing system, AF foam pump.