Today, Lianyungang Shengyuan Technology Co., Ltd. will share with you what is the (air preheater) intelligent automatic ash removal device?
Air preheater is an important heat exchange device inside the boiler body. At present, there are many types of air preheaters used in the market. Large and medium-sized boilers mainly use rotary air preheaters, while small and medium-sized boilers with hood covers mainly use tubular and heat-conducting air preheaters. These two types of air preheaters have their own advantages and disadvantages, but they all have a common disadvantage - they are prone to ash blockage and corrosion in the low-temperature section. There are many reasons for this, mainly due to the installation of desulfurization and denitrification equipment in the boiler after meeting the mandatory ultra-low emission requirements of the environmental protection department. The produced ammonium bisulfate becomes liquid within the range of 146-270 ℃. The liquid ammonium bisulfate (NH4HSO4) is prone to capture fly ash in the flue gas, forming molten salt like substances that adhere to the outer surface of the air preheater heat exchange tube bundle at the tail of the flue, causing blockage and corrosion of the air preheater. After the corrosion and air leakage of the air preheater tube, the smoke temperature decreases, which further exacerbates low-temperature corrosion and forms a vicious cycle. The intelligent automatic ash removal device developed by our company for non clogging fly ash tubular air preheaters is aimed at addressing the above phenomenon, successfully and effectively solving the problems of wear, ash accumulation, corrosion, and other issues of tubular air preheaters in the current market. At present, the widely used boiler cleaning devices in the market include acoustic soot blowers, steam soot blowers, pulse gas soot blowers, etc. However, all three types of soot blowers have many disadvantages
1. Disadvantages of sonic soot blowers
(1) A dedicated compressed air station is required, which requires a large one-time investment in equipment;
(2) The energy is relatively small, and for the furnace and convective heating surface, especially for the low-temperature air preheater, slagging, adhesive ash accumulation, severe ash blockage, and hard ash scale cannot be removed;
(3) The effective distance is limited, and the number of acoustic soot blowers installed is higher than that of traditional soot blowers; The installation of acoustic soot blowers with amplification structures is limited in high-temperature areas;
(4) Due to the use of saturated compressed air in the infrasonic soot blower, the filter needs to be drained regularly, and frequent freezing in winter can cause the filter to rupture; The sonic soot blower and oil mist blower need to be refueled regularly;
(5) If the air duct is not equipped with cooling air or the cooling air pressure is low, it will cause severe corrosion of the compressed air duct; If the compressed air pressure used in the sonic soot blower does not meet the requirements and the cleaning area is limited, the soot blowing effect will significantly deteriorate.
2. Disadvantages of steam soot blower
(1) Due to the fact that steam soot blowing relies on steam jet injection, the jet beam has a limited area of action, resulting in a limited medium blowing area;
(2) Due to the fact that the steam soot blower rotates the nozzle deep into the furnace for soot blowing, and the nozzle needs to be removed after soot blowing, there are many moving parts, which results in frequent operation and high probability of failure of the soot blower, as well as a large amount of mechanical and electrical system maintenance and repair;
(3) High steam consumption and high operating costs.
3. Disadvantages of pulse gas soot blower
(1) Blowing ash consumes gas and requires regular replenishment of the gas source; Gas is prone to leakage and poses safety hazards;
(2) Blowing ash mainly has a significant effect on the area near the vertical scouring surface, and there are blind spots in blowing ash;
(3) Long term vibration and erosion of fixed heating surfaces during soot blowing can cause certain damage to the furnace structure.
The intelligent automatic ash removal device for tubular air preheater produced by Lianyungang Shengyuan Technology Co., Ltd. can replace acoustic soot blowers, steam soot blowers, pulse soot blowers, prevent blockage, corrosion, coking, thoroughly clean ash, operate intelligently and automatically, work stably and reliably, have no maintenance costs, and have a long service life! Welcome to call for consultation!
