以省内某通流升级改造后630MW汽轮机的低压缸为研究对象，通过微增出力

630MW low-pressure cylinder to a turbine flow after upgrading province as the research object, by a slight increase of output test were obtained Backpressure on the relationship of the unit heat rate, output, and the exhaust volume flow and low-pressure cylinder the efficiency curve, the operating characteristics explore low-pressure cylinder; statistically significant operating data for the full year 2019 unit, to obtain the average load rate and the average back pressure data, in order to exhaust extrapolated annual average volume flow, results show under the above conditions, the low-pressure region to work effectively in the cylinder; the same type of horizontal comparison parameters, different length low pressure cylinder steam turbine last stage blade, the two units of the binding data transformation performance evaluation test of 50% THA, the comparison result further confirmed that the low-pressure cylinder unit has better operating characteristics contribute to wide-load operation of the economy in the face of the depth peaking.

Taking the low-pressure cylinder of 630MW turbine after the upgrade of a current in the province as the research object, through the micro-increase experiment, the influence relationship between back pressure on unit heat consumption rate and output, as well as the relationship curve between the exhaust volume flow and the low-pressure cylinder efficiency, explores the working characteristics of the low-pressure cylinder. The unit's important operating data for the whole year 2019 are calculated, the average annual load rate and the average annual back pressure data are obtained, and the average annual exhaust volume flow is calculated, and the results show that under the above conditions, the low-pressure cylinder is in the efficient working area; Combined with the data of 50% THA after the transformation of the two units, the results further verified that the working characteristics of the low-pressure cylinder helped the unit to have a better wide-load operation economy when facing the deep peak adjustment.

Taking the low pressure cylinder of a 630 MW steam turbine after the upgrade of through flow as the research object, the relationship between the back pressure on the heat rate and output of the unit, and the relationship between the exhaust volume flow and the efficiency of the low pressure cylinder are obtained through the slightly increased output test, and the working characteristics of the low pressure cylinder are explored; the important operation data of the unit in 2019 are counted, and the annual average load rate and the annual average load rate are obtained The annual average back pressure data can be used to calculate the annual average exhaust volume flow. The results show that under the above conditions, the LP cylinder is in the high-efficiency working area. The comparison results further verify that the working characteristics of the LP cylinder are helpful to the unit by comparing the performance test data of 50% tha of the same type parameters and different last stage blade lengths of LP cylinder In the face of deep peak load regulation, it has better wide load operation economy.<br>