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In order to solve a series of problems caused by photovoltaic (PV) off-grid, PV must have the low voltage ride through (LVRT) capability ensuring grid-connected operation and outputting reactive power to power grid within a certain time range. At present, the control strategies of PV grid-connected inverter under balance fault have been used effectively. However, the strategy of keeping the inverter...
The steam temperature at the outlet of the reheater has always been lower than the designed value in a power plant. A reheat steam temperature adjustment test was conducted on the two subcritical, intermediate reheat and natural circulation boilers in the power plant. By analyzing the test data, reasons of the low reheat steam temperature have been discovered. What's more, three schemes about capacity-increasing...
A full diagnosis of a 600MW boiler, against the series of problems of high exhausting flue gas temperature, inadequate unit capacity, high auxiliary power consumption and so on, is conducted. These problems has accompanied with the boiler for a long time since the commissioning. It turns out that the huge amount of Primary Air need causing by insufficiency of the mill output is the key point of all...
For the shortcomings of the traditional performance diagnosis method of power plant boiler current, the paper proposed a method of introducing the fuzzy comprehensive evaluation into performance diagnosis of power plant boiler. This method first took the boiler safety, economy and environmental protection three aspects into account to find boiler performance parameters. In order to accurately understand...
The numerical model is built for the primary air duct of the pulverizing system with medium speed mills, and the inner flow fields are simulated by employing the commercial code of FLUENT. The simulated results show that the lengths of the straight ducts before and behind the measuring element are too short to meet the requirement of the flow rate measurement of the primary air due to the compact...
A vertical axis and lift type wind rotor with 900mm height and 900mm rotational diameter was built. Then the wind rotor was located in a low velocity wind tunnel with a 1000mm×1000mm test exit, to investigation the maintain braces influence to the performance of wind rotor. Three kinds of brace were used; these were 10mm diameter cylider, airfoil and 3mm lamina. The research result show that the brace...
As the temperature change effect of the primary air and powder mixture in storage-type milling system, it is difficult to obtain accurate results of the direct measurement of the primary wind speed, resulting in this type of boiler system, the thermal adjustment of milling tests difficult. To address this problem, according to the heat balance principle of the air-tube boiler pulverized coal flow,...
The significance of primary air is widely recognized in fossil fuel conveyor system as predominant power resources. Engineering applications have shown that the primary air may behave as a medium of fuel delivery and combustion. Regular combustion is decided to great extent by a proper air-to-coal weighted ratio. However, little is known about currently employment on sealing air related to the air-to-coal...
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