Boiler Economiser.

Don't fully understand the question, but to put foreword some suggestions. There are two possibilities, one the erosion due to the grit in the ash or two damage due to water. As the erosion is occurring at the inlet header the second possibility is more likely? If you have heavy ash content and you run continually at full load, then there is the need too regularly soot blow? raising the possibility of water from the blower mixing with the ash and if it has a high sulphur content, then the conditions may be just right to attach the economiser tubing? If it is due to grit then some baffle plates may be necessary.

Just a few thoughts. Regards JD.

Why don't you ask AFBC boiler manufacturer first? They are the first one to advice you.

Also ask a couple of other big water tube boiler manufacturers like Babcock, Nebraska, Stien etc.

Hi

It has been alwya seen that front or leading tubes of economizer get erroded due

high velocity of flue gases with lot of ash content with it.so generally we use protection shield or sacrifial parts on the tube part facing the flue gases. These parts may be of SS 310 ,or any suitable wear resistant material

As boiler running full load with high ash content of coal so my sugessation is

1, First measure velocity of flue gas at inlet of flue gas to economiser

2, If velocity higher then use protactive shield or increase rise husk to reduce ash content prposition.

3, Apply shile on eco inlet (material SS 316,SS 308 )

JDRetired is 100% right in stating:

possibilities, one the erosion due to the grit in the ash or two damage due to water. As the erosion is occurring at the inlet header the second possibility is more likely? If you have heavy ash content and you run continually at full load, then there is the need too regularly soot blow? raising the possibility of water from the blower mixing with the ash and if it has a high sulphur content, then the conditions may be just right to attach the economiser tubing? If it is due to grit then some baffle plates may be necessary.

Just a few thoughts. Regards JD.

Does your Boiler have a sooth Blower?

Moreover, what do the manufacturers comment? Can you please highlight.

Boiler, boiler, boiler, you have to problems working against you. One is the high sulfur content the other is the fly ash. The sulfur compounds will combine with any available moisture and form sulfuric acid, compounded by the abrasion characteristics of the fly ash and you have a big wastage problem. We are using two process for resolving these problems, both have been approved by a very large OEM. Weld overlay and thermal spraying. So far the thermal spray has produced the best results for the money. Most of the work I have done has been on super heater and water wall applications. This has also been successful in recovery boilers as well. Good luck!