Defects of Cast Steel Nozzle
cast steel nozzles mainly include the following aspects.
1. Cast steel nozzle is not wear-resistant, corrosion-resistant, not high temperature resistant, short service life. Need to stop furnace replacement, resulting in great economic losses.
2. The cast steel nozzle is easy to be damaged during the operation of the unit, and the blunt body of the nozzle often falls off, which threatens the operation of the burner and the safe operation of the slag fishing machine.
3. As the nozzle is made of G40Cr20Ni5, this material works at high temperature for a long time. When the pulverized coal burns unstable, it will cause uneven temperature distribution in the furnace or coking at the nozzle, which will cause thermal stress at the nozzle due to temperature difference, resulting in severe local deformation of the nozzle, shorter primary air range and poor rigidity. The pulverized coal will catch fire not far from the nozzle, and the temperature near the nozzle will be high, resulting in local additional stress, when the temperature fluctuation is large, the thermal stress changes greatly, resulting in the formation of thermal fatigue cracks on the nozzle surface, a long time, resulting in burner nozzle and nozzle burning.
4. Because the primary air flow is a high-speed gas-solid two-phase flow, the uneven scouring of pulverized coal particles leads to serious local wear of the bluff body and even the bluff body is worn away. On the other hand, the nozzle and the bluff body are integrated. On the other hand, the thermal stress at high temperature is easy to cause the nozzle to produce serious deformation and even burn out, so the nozzle cannot play its due role. How to choose
silicon carbide nozzle cleaning agent, silicon carbide nozzle manufacturer tells you
Suzhou shanchunyi monitoring program control equipment manufacturing co., ltd. has excellent technical team, many engineers and relevant technical background of boiler factory. With experience in large-scale overseas projects such as Pakistan Muza and Iran Sahante, it supports complex customization and brings forth new strengths through the old. It develops more than 8 new products every year, with an annual production capacity of 600 sets and a guaranteed supply cycle.
The quality and efficiency of the use of silicon carbide nozzles are also related to many factors, and the purchase of silicon carbide nozzles needs to consider the system conditions and operating conditions.
The traditional nozzle adopts the structure of cast steel, and the proper swing of the burner silicon carbide nozzle can change the position of the flame center to adjust the reheat steam temperature level; the dense and lean pulverized coal burner can prevent coking and high temperature corrosion in the furnace, and has the characteristics of stable ignition, good low load stability and low NOx emissions.
The integral silicon carbide nozzle can effectively prevent fouling and slagging: when the boiler is fired with easy fouling and slagging coal, fouling, coking and slagging are easy to occur at the burner nozzle, thus affecting the combustion performance of the boiler. Because the conventional burner nozzle is made of cast steel, the material will deform in high temperature environment for a long time, resulting in uneven nozzle and eddy current;