For every 10 decreases in the temperature of reheated steam, the coal consumption increases by 065g kWh, and the factors that affect the reheating steam temperature are two kinds of desuperheating water leakage and high wall temperature of the reheater.
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With the same load and the same air volume, have you found that the steam temperature of your reheater is lower than that of other furnaces? At this time, we do not have the means to adjust, and many times we are limited by the wall temperature of the reheater and cannot be effectively adjusted.
There are many reasons for the low steam temperature of the reheater, such as the change of combustion, the operation mode of the milling system, soot blowing, the leakage of the desuperheating water control door, the flue gas baffle of the reheater, etc. For these reasons, we can take effective adjustment means, even the desuperheating water adjustment door leaks, we take extreme measures to close the reheater desuperheater desuperheating water before and after the electric door. But there is only one reheater wall temperature that we have a hard time adjusting.
The reasons and adjustments for the high wall temperature of the reheater, the author's guidance means are also very few, and the following articles are summarized according to the operating experience
1.The ash accumulation in the reheater area leads to the flue gas heat can not be effectively absorbed, resulting in the increase of the flue gas temperature here, and the wall temperature of the reheater can not be effectively controlled, the main performance is the overall increase of the wall temperature.
2.Theoretically, the more the number of units running in the upper milling system, the reheater will increase due to the increase of the flame center, but the increase will also be limited by the wall temperature, and the overall wall temperature of the reheater will increase.
3.The adjustment of the secondary air, the upper ember wind is small, and the flame center moves up, which plays a certain role in increasing the steam temperature of the reheater. At full load, the upper layer of the ember is turned off to less than 60%, and the nitrogen oxides will rise significantly.
4.The flue gas flow in the furnace is skewed, which the author believes is the reason why the steam temperature of most boiler reheaters cannot be raised. If you don't admit it, let me tell you a little bit, the wall temperature of our reheater is one or two measuring points high, right? You won't see all reheater wall temperatures high together. The flow of flue gas has always been only a simulation test and flow, as for how to flow in a normal way, it is estimated that no one has gone in to observe it.
The factors affecting the wall temperature of the reheater also include the installation of the measuring point, the flue gas baffle of the reheater, and so on. Relatively speaking, the adjustment is within the acceptable range, and will not be elaborated in detail, and more factors that lead to the low steam temperature of the reheater are welcome to leave a message in the comment area.
boilers