Research and Application of Numerical Simulation for Selective Catalytic Reduction Denitration of 9F Gas Turbine

doi:10.12096/j.2096-4528.pgt.21062

Abstract

Abstract:

Taking a 9F gas turbine waste heat boiler as the research object, the numerical simulation of gas flow field from gas turbine outlet flue to catalyst layer was carried out, the flue gas flow field of single layer catalyst, two-layer catalyst and two-layer catalyst+uniform plate was obtained. The results show that the expansion flue in front of the first-layer heat exchanger of the original structure has a short distance and a large expansion angle. When the high-speed swirling flue gas at the outlet of the gas turbine enters the large-area static basin within a short distance, it is too late to evenly scour the entire large cross-section and dissipate the inertial swirling flow, resulting in the poor uniformity of flue gas flow field at the inlet section of the first layer of heat exchanger. The flow field distribution after adding one layer of catalyst is basically the same as that of single layer catalyst, and the uniformity of flow field distribution at the inlet of the first layer catalyst is slightly better than that of single layer catalyst when adding two layers of catalyst. This is because adding one layer of catalyst is equivalent to adding one layer of flow blocking element, which has a blocking effect on the flue gas. The flow field uniformity at the inlet of the first layer heat exchanger can be improved by adding a deflector in the inlet flue, and the cross-sectional velocity C_v decreases to 21.3%, which indicates that the deflector can improve the flow field distribution in the subsequent flue.

Key words: 9F gas turbine, selective catalytic reduction(SCR), flow field, numerical simulation, catalyst

CLC Number:

TK 09

Hongyi ZHANG, Litao QU. Research and Application of Numerical Simulation for Selective Catalytic Reduction Denitration of 9F Gas Turbine[J]. Power Generation Technology, 2023, 44(1): 78-84.

Figures/Tables 10

Tab. 1 Summary of boundary condition parameters

项目	参数	数值
烟气性质	温度/℃	347
	ρ/(kg/m³)	0.571
	C_P /[J/(kg⋅K)]	1 142
	λ/[W/(m⋅K)]	5.247×10^-2
	μ/(Pa⋅s)	3.006×10^-5
入口边界	流量/(kg/s)	681
入口边界	当量直径/m	5.419
出口边界	相对压力/Pa	0
出口边界	当量直径/m	7.6

Fig. 1 Grid division diagram

Fig. 2 Relative position of the flue and heat exchanger, the cross section of the ammonia injection grid, and the catalyst layer

Tab. 2 Summary of the simulation results of the inlet cross-sectional flow velocity of the first layer heat exchanger

C_v 值/

Fig. 3 Streamline front view under the single-layer catalyst BMCR working condition

Fig. 4 Main section velocity distribution cloud diagram under the single-layer catalyst BMCR working condition

Fig. 5 Front view of streamline under the two-layer catalyst BMCR working condition

Fig. 6 Main section velocity distribution cloud diagram under the two-layer catalyst BMCR working condition

Fig. 7 Streamline front view under the two-layer catalyst + uniform plate BMCR working condition

Fig. 8 The cross-sectional flow velocity distribution at the inlet of the first layer heat exchanger cloud diagram under the two-layer catalyst + uniform plate BMCR working condition

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