Steam Turbine Performance Test and Analysis of 100MW
|Course||Power Engineering and Engineering Thermophysics|
|Keywords||Thermal System Thermal Performance Test Thermal Performance Calculation Uncertainty Analysis Heat Difference of Heater|
Steam turbine thermal performance test is an industrial experiment which is conducted during the operation of a specific thermodynamic cycle system using the method of thermal measurements. The aim of such a test is to evaluate the thermodynamic characteristics of the steam turbine in some given operation modes. The test mainly consists of two steps: data collection and performance calculation. To ensure the reliability and accuracy of analysis results, these two steps must be carried out comply with relevant testing rules.The research object of this paper is the 100MW steam turbine thermal system of Pangang Owned Power Plant. The steam turbine units have failed to achieve the technical and economic expectations for many years owing to the heavily burdened productive task and the imperfections inherent in the units. Based on the thermal performance analysis of 100MW steam turbine thermal system of Pangang Owned Power Plant, the thermal efficiency of the units was calculated using matrix method. Also, the tech-economy characteristics of the units were analyzed. Moreover, the components that were not in good conditions thus might lead to the low performance were found out. For this regard, this paper was completed as follows:①Based on GB8117-87“Rules for Steam Turbines Thermal Performance test of Power Plant”with reference to ASME PTC6.0-199, the test was carried out under three operation conditions, which are at rated load(100MW), 80% load and 70%load, respectively. Before the test, measuring points were confirmed and the instruments for each measuring point were carefully checked and calibrated in accordance with relevant standard to meet the calculation accuracy requirement. For the measuring points which didn’t satisfy the accuracy or were not installed, repairing or re-installations needed. The steam turbine performance test outline, and list of measuring points were finished before the test. When the test conditions were reached, the load was adjusted to start the test in the required time. At the same time all the data were collected and recorded.②Using modular modeling method, the thermal power system was divided into individual parts represented by the typical components of the system. Combined with the traditional heat balance methodology, heater math model, thermal system matrix model and thermal economy math model were established with fully considering the effect of assisted steam and water. Using object-oriented programming language Visual C++, computational procedure to calculate the steam turbine thermal performance was programmed according to corresponding principles. The calculations of testing conditions, the first modification, the second modification and uncertainty analysis were finished in sequence. According to analysis of experimental data and calculated results, improve suggestion was put forward for units running.③The influences of temperature difference between two ends of the heater, extraction pressure loss and supercooling on the thermo-economic characteristics of steam turbine units were quantitatively calculated. The reasons for the large temperature difference between two ends of the heater, extraction pressure loss and supercooling have been explained. In the meantime, the existing imperfections of the units were pointed out, which may provide reference for technical improvement of the steam turbine in the future.