解決6噸熱水鍋爐尾部受熱面磨損問(wèn)題
Solve the problem of heating surface of 6 tons of hot water boiler
6噸熱水鍋爐進(jìn)入尾部煙道的飛灰由于溫度較低，具有一定的硬度，因此隨煙氣初級(jí)受熱面排管時(shí)，會(huì)對(duì)管壁產(chǎn)生磨損作用。特別是省煤器，進(jìn)口煙溫已降至450°C左右，灰粒較硬，且采用小直徑薄壁碳鋼管，更易受到磨損損壞。而且磨損也正是省煤器爆管在鍋爐四管爆破事故中占的比例較高的原因之一。
The fly ash that enters the tail flue is because of the low temperature, it has certain hardness, so as the exhaust gas primary heating plane pipe, it will wear effect to the wall of the pipe. Especially the economizer, import the smoke temperature has fallen to about 450 ° C, ashes is hard, and using small diameter thin-walled carbon steel tube, are more susceptible to damage of wear and tear. And wear is one of the reasons that the coal burner has a higher proportion of the boiler's four pipe blasting accidents.
含有硬粒飛灰的煙氣相對(duì)于管壁流動(dòng)，對(duì)管壁產(chǎn)生磨損稱(chēng)為沖擊磨損，也稱(chēng)沖蝕。沖蝕有沖刷磨損和撞擊磨損兩種基本類(lèi)型。兩種磨損的金屬流失過(guò)程的微觀形態(tài)是不完全相同的。
The flue gas that contains the hard particle fly ash is relative to the flow of the wall of the pipe, and the damage to the wall of the tube is called the impact wear, also called erosion. erosion
There are two basic types of erosion wear and impact wear. The microscopic appearance of two worn metal loss processes is not exactly the same.
沖刷磨損是灰粒相對(duì)管壁表面的沖擊角較小，甚至接近平行。灰粒垂直于管壁表面的分立使它楔入被沖擊的管壁，而灰粒與管壁表面相切的分力使灰粒沿管壁表面滑動(dòng)，兩個(gè)分立合成的結(jié)果起一種對(duì)管壁表面切削的作用。
The erosion of the ash is smaller and even close to parallel than the surface of the surface of the ash. Soot particle separation to make it on the surface of the perpendicular to the pipe wall wedging the shock tube wall, and ashes and wall surface tangent component makes ashes sliding along the wall surface, synthetic results of two separate ACTS as a cutting on the surface of a wall.
如果管壁經(jīng)受不起合力的切削作用，就有金屬顆粒脫離母體而流失。在大量飛灰長(zhǎng)期反復(fù)切削作用下，管壁表面將產(chǎn)生磨損。
If the wall is not able to withstand the force of the cutting, the metal particles are lost from the matrix. The surface of the tube wall will wear out after a large amount of the long and repetitive removal of the ash.
