The gas from the blast furnace is heated by a gas heater and compressed in a low pressure press to increase the gas pressure. In order to improve the efficiency of the high-pressure gas compressor, the outlet gas of the low-pressure coal press is cooled by an intercooler, and then sent to a high-pressure coal press for compression and boosting. After the three gas flow regulating valves are passed through the three gas flow regulating valves, the compressed air from the air compressor enters the combustion chamber and burns into high temperature gas, and then enters the turbine to work, and the exhaust gas enters the waste heat boiler.
The gas composition of the gas composition is CO220%, CO2312%, H2312%, N25316%, and the thermodynamic characteristics and parameters of the gas are affected by the gas composition. The equipment performance and status parameters calculated by the GSE software according to the physical properties are more in line with the actual operation of the on-site unit.
The low-pressure coal press adjustable vane low-pressure coal press is a 15-stage compressor, and the whole process of the vane is adjustable. The adjustable range is 25°-90°. In the stage of unit speed increase and load increase, the vane is involved in regulating the gas. Pressure and flow. The change of the adjustable vane can be simulated by the valve model, and the characteristic curve of the valve can be adjusted to meet the relationship between the adjustable vane opening and the gas pressure and flow.
Low-pressure coal press characteristic curve The low-pressure coal press adopts the Centrifugal Pump model to simulate the relationship between the rotational speed and the outlet pressure and flow during the acceleration of the unit. The relationship between the gas flow and the outlet pressure can be simulated at constant speed. Each adjustable vane angle of the low-pressure coal press corresponds to a flow and pressure curve, and the characteristic curve is more complicated. In the dynamic simulation, the influence of the change of the vane angle on the flow and pressure should be considered. The model curve can be associated with the valve for simulating the adjustable vane. The vane angle change can be changed by the opening of the valve. The curve changes to reflect the real situation of the compressor.
The air compressor air compressor is the first three-stage vane-adjustable axial compressor. Because the general compressor model is difficult to reflect the unit's power consumption, working pressure and flow rate when the unit is in the starting speed increase and the idle running. The relationship between the speed and the speed is used. Therefore, the GSE pump model is used to simulate the air compressor, and then the efficiency and performance curves are adjusted to meet the simulation requirements of the whole working condition of the unit. Similarly, the adjustable vanes are modeled using a valve in front of the pump model. Considering that the cooling air and anti-surge air of the gas turbine are extracted from different parts of the air compressor, the three pump bodies are used to segment the simulated air compressor.
Gas flow regulating valve The valve characteristics of the three gas flow regulating valves must meet the requirements of regulating the gas flow below 50MW, and also meet the requirements for regulating the outlet pressure of high-pressure coal press above 50MW. In order to make the gas flow regulating valve correspond to the gas flow, gas pressure and unit power under variable working conditions, not only the characteristic curve of the gas regulating valve, the valve admittance (corresponding valve diameter) and other body parameters should be considered. It should also be adjusted in combination with the characteristics of equipment such as high and low pressure coal presses and the characteristics of the entire pipeline of the gas system.
The valve flow is calculated by the device that flows through the channel. The formula is: f = vp × Ï Ã— ΔP × A where: fD flow, ÏD density, ΔPD differential pressure, vpD valve opening, AD admittance. The admittance concept is similar to the fluid impedance sQ2 (sD correlation coefficient, QD volume flow). In GSE modeling, the conductivity of pipelines, valves, and equipment is defined by admittance, which can be approximated as the impedance coefficient of fluid passage. When the value is equal to 0, the impedance is infinite, and the pipeline can be considered as unreasonable.
Turbine turbine 4, inlet temperature 1060 ° C, exhaust temperature 540 ° C. Using the turbine model in the GSE model library, multiple performance curves can be set to simulate turbine performance under different operating conditions.
Conclusion Using the GSE software platform, the static modeling and dynamic simulation of the gas turbine system are carried out. The reaction mechanism of the gas turbine system is carefully simulated according to the principles of thermodynamics and fluid mechanics. The whole gas turbine system model can accurately reflect the parameters of each typical working condition. It can reflect the changing trend and amplitude of each parameter in the process of speed increase, grid connection, load increase and normal, accident shutdown, and has a good match with the parameters such as flow, pressure, temperature and valve opening at each point. Sex.
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