丹麦FORCE公司在各个工业领域内的流场模拟案例

Low velocity
Velocity vectors of for original design
Velocity vectors of for design optimised by FORCE Technology
Velocity contours of vertical velocity for baseline design
Optimisation of Waste to Energy plant
Base line design
The plant owner wanted to increase the capacity and reduce the level of CO emission from an existing waste fired furnace.
Contours of temperature
Contours of temperature
Redesign
Contours of O2
Contours of O2
In the baseline design contours of CO show large gradients in the combustion chamber and a high level of CO extending out of the combustion chamber. In the redesign the gradients are less and the level of CO much lower at the exit of the combustion chamber. The better performance is due to the better mixing created by moving the air nozzles.
Stream lines from burners
Temperature distribution
Urea injection planes
Heat exchanger failure
Eddy Current result from inspection Flow field analysis from Computational Flow Dynamics
FORCE Technology
Industrial Processes
• Department overview • Examples:
• Power engineering • Ventilation • Maritime, Oil and Gas • Design and optimisation of various devices and processes
SNECMA
Projects within
• • • • • •
Flue gas cleaning (SCR, SNCR, ESP, FGD, Bag filters) Combustion (coal, oil, gas, waste and biomass) Oil and Gas (flow, settling, optimisation of equipment) Ventilation (power houses, clean rooms) Design and optimization of different devices Design and optimisation of different plants and processes
Secondary air nozzles moved to roof of furnace Insulation removed from radiation arc
Nose arch implemented in boiler
An internal wall is moved towards the outlet
Issues: • Narrow temperature window for the non-catalytic NOx reduction • Mixing of urea into flue gas
Urea injection nozzles positioned on side walls Results:
The objective
We assist our clients in flow optimisation of products or processes with regard to: • • • • Functionality (better) Efficiency (higher) Environmental loads (smaller) Etc.
Examples Power Engineering:
• • • • • Optimisation of Waste to Energy plant Optimisation of biomass furnace SNCR positioning Trouble shooting of heat exchanger failure and superheater erosion Flue gas dispersion
Power Engineering Fluid Dynamics
• Furnaces and boilers (coal, oil, gas, waste and biomass) • Flue gas cleaning (ESP, FGD, SCR, SNCR, Bag filters) • Air heaters, flue gas ducting, by-pass systems and funnels • Flue gas dispersion • Coal mills and pneumatic coal transport
Grate
wenku.baidu.com
Radiation arc
Stream lines from air nozzles
Secondary air penetrates only the upper part of the furnace and creates no additional mixing in the primary combustion zone
Every thing from: • Small medical devices to large power plant furnaces
• Devices working deep below ground to aeroplanes flying high above ground
Clients
Resulting NOx level in flue gas • Client’s temperature measurement at predicted locations were in full agreement with CFD analysis. • NOx measurements showed a good reduction level of approximately 50% • Possibility of further optimisation of boiler geometry
Areas with high erosion
Our philosophy: Combine the right tools
Consultancy
& Experience
Solutions & Diagnostics
Experimental test
EFD
Computational analysis
CFD
Experimental Fluid Dynamics
Contours of CO
Contours of CO
Optimisation of biomass plant
The original design showed an area with low velocity near the front wall of the furnace. By changing the angle and flow rate of each of the nozzles, a significantly more uniform velocity distribution was obtained. Low velocity
Secondary air nozzles
FORCE Technology investigated the baseline design using CFD and problematic flow conditions were indentified.
Redesign by FORCE Technology
International clients are typical equipment manufactures, ship and plant owners/contractors in the main segments: • • • • • • • Energy sector: coal, oil, gas, biomass, waste etc. Maritime: Ship, platform, oil & gas Wind engineering Chemical Food Pharmaceutical Appliances
Temperature in centreplane
SNCR feasibility study in oil fired plant
SNCR implementation was possible and an optimum location identified. This was based on location of the temperature window between 950°C and 1100°C together with the residence time.
Optimisation of Waste to Energy plant
Baseline
Contours of O2 level show large gradients in the combustion chamber for the baseline design. This indicates poor mixing of fuel and O2 and that the secondary air does not participate in the primary combustion. The redesign shows much less gradients and better mixing. Large temperature gradients and very local and intense combustion can be observed in the baseline design. In the redesign, gradients are less and the maximum temperature not so high. The redesign performs significantly better.
Velocity contours of vertical velocity for design optimised by FORCE Technology
Support for NOx reduction and SNCR installation
An company producing biomass fired plants contacted FORCE Technology for assistance in identifying where to inject ammonia/urea in their straw fired plant to be able to NOx emissions.