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Study on Gas-Solid Flow in 300MW Tangential Fired Boilers

Author: ZhaoCuiLing
Tutor: QinYuZuo；SunShaoZeng
School: Harbin Institute of Technology
Course: Thermal Power Engineering
Keywords: tangential fired boiler grid numerical simulation momentum equilibrium
CLC: TK221
Type: Master's thesis
Year: 2007
Downloads: 168
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Abstract


The tangential combustion is the most widely used and the most mature technology of pulverized coal combustion in China today. With the increasing demand of the energy saving and environmental protection, more and more scholars pay attention to the flow field, the coal combustion, the heat and mass transfer in the tangential fired furnace. And the means of numerical simulation is often used in these processes.This paper studies the grid types of the tangential fired boiler model with FLUENT software. And the grid type is the one of the most important factors to the simulation effect. The analyzed results are applied to the NO.3 boiler of Shengli Power Plant. The research on the gas flow field in the furnace and the gas-solid flow field in the burner has been done. Furthermore, based on the results of numerical simulation, the tangential reverse rotation phenomena in the furnace are studied.Four classic types of grid in the numerical simulation of tangential fired boiler are discussed in the paper. Grid A is the fan-shaped. Grid B is the quadrate on the cross and fan-shaped on the rest. Grid C is the fan-shaped in the corner and the quadrate on the rest. Grid D is the triangle. Based on the four types of grid, numerical simulation of a cold scaled boiler model has been done. The result shows that the grid C is more suited to the tangential fired boiler. So the grid C is applied to the NO.3 boiler of Shengli Power Plant to simulate the gas flow field in the furnace. Reasonable agreement is obtained between the numerical results and the testing data.The Realizable k-εtwo equations turbulent model and Lagrangian stochastic trajectory model are used to simulate the gas flow and the gas-solid flow in the burner. The result shows that the fuel-lean stream of primary air has velocity component in the anticlockwise direction, it brings the plus momentum. But the fuel-rich stream of primary air has velocity component in the clockwise direction. And it brings the negative momentum. The negative momentum is an important factor that makes the tangential circle rotating in the reverse direction.In the end, the paper carried out the calculation about the momentum equilibrium of the air injections in three parts. The first part is the discussion of the momentum equilibrium of lower two primary air and four secondary air. And then it is the all air injections momentum equilibrium calculation. The last part is all air injections momentum equilibrium calculation with no rich/lean departure in primary air. The critical conditions that make the tangential reverse rotation have been got in the first and the second part. The result of the last part shows that whether it is in the cold state or in the thermal state, the plus momentum-moment is bigger than the negative one. So there is no net momentum-moment which makes the tangential reverse rotation in the furnace when there is no rich/lean departure in primary air.

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CLC: > Industrial Technology > Energy and Power Engineering > Steam Power Engineering > Steam boiler > Theory
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