Application of finite element analysis of absorption tower
2016-02-03 10:09:46
Author: Wan Rongchao Li Tiancai
Overview: desulfurization absorption tower as the core component of the desulfurization system, its structure and size is relatively large, and the load of the diverse and complex, is difficult to accurately calculate each part of the stress and strain of the general manual mechanical calculation. In this paper, through the finite element analysis software ANSYS to absorption tower structure of the whole mechanical analysis, so as to be able to accurately calculate under different load absorption tower every part of stress and strain.
1. the general situation
A power plant project planning and construction capacity of 4 x 660MW coal-fired ultra supercritical units, while the construction of flue gas desulfurization unit desulfurization using limestone - gypsum wet flue gas desulfurization process (referred to as FGD). FGD uses a furnace and a tower desulfurization unit, 100% flue gas desulfurization. A project in general for desulfurization absorption tower:
Figure 1: absorption tower diagram
The FGD system is countercurrent spray tower structure: the raw gas through a rectangular entrance into the tower, to flow and downward spray limestone slurry contact and reaction, and most of the SO2 in the flue gas was "washed out". By "washing" after the flue gas carrying a large number of liquid droplets, by removing mist eliminator, most of the liquid droplets trapped down reflux to the absorption tower. Then, "clean flue gas" through the absorption tower to flow through the net flue, and finally through the chimney into the atmosphere.
Desulfurization absorption tower using carbon steel and anti-corrosion design, part of the strong corrosion parts of the use of full alloy or lining of the process. This calculation mainly for the absorption tower body parts of the steel, through the use of finite element analysis software (ANSYS) of the absorption tower and steel body parts under different loads should stress and strain analysis, so as to optimize the absorption tower design.
2. design data:
2.1, the overall design of the absorption tower size:
1), absorption tower diameter D:? 15720mm, total height of H:35900mm
Inlet flue high H inlet: 4018mm, wide W inlet: 12580mm, the prominent tower body length L entrance: 1502mm
Exit flue high H export: 5090mm, wide W export: 10180mm, the outstanding tower body length L export: 1410mm
2) anchor bolts: M36*1220 36
Design thickness of absorbing tower shell 3:
No. | Storey height range(mm) | floor height(mm) | Plate thickness(mm) | Material | remarks |
1 | 0-30 | 30 | 30 | Q345B | Basic loop |
2 | 30-2790 | 2760 | 18 | Q345B | Vertical shell |
3 | 2790-6390 | 3600 | 16 | Q345B | Vertical shell |
4 | 6390-19190 | 12800 | 14 | Q345B | Vertical shell |
5 | 19190-27890 | 8700 | 12 | Q345B | Vertical shell |
6 | 27890-30802 | 2912 | 10 | Q345B | Vertical shell |
7 | 30802-35900 | 5098 | 8 | Q345B | Cone top |
8 | Absorption tower inlet | 5.5 | Alloy 59 | inlet flue duc | |
9 | Absorption tower outlet | 8 | Q345B | outlet flue duc |
Note: the design thickness of the absorption tower contains the corrosion allowance of plate 2.0mm and the negative deviation of the plate 0.5mm, the size of the calculation of the model is: design size -2.5mm
4) reinforced, strengthened ring and portal:
No. | Height / position(mm) | type | Size(mm) | Material |
1 | 4050 | stiffener ring | 44×450 | Q345B |
2 | 7350 | stiffener ring | 40×400 | Q345B |
3 | 11370 | stiffener ring | 40×440 | Q345B |
4 | 12800 | stiffener ring | 44×470 | Q345B |
5 | 17720 | stiffener ring | 44×470 | Q345B |
6 | 18720 | stiffener ring | 40×440 | Q345B |
7 | 28120 | stiffener ring | 35×350 | Q345B |
8 | 30802 | stiffener ring | 40×400 | Q345B |
9 | inlet flue duct | Reinforcing bar | HN400×200 | Q345B |
10 | HN350×175 | Q345B | ||
11 | HN300×150 | Q345B | ||
12 | Inlet flue duct | upright column | HW458×417 | Q345B |
13 | HW428×407 | Q345B | ||
14 | Exit flue & cone roof | Reinforcing bar | HN400×200 | Q345B |
15 | HN300×150 | Q345B | ||
16 | HN200×100 | Q345B |
5) Internal support beam:
No.
| name | Specifications(mm) | length(mm) | Allowable deflection(mm) | material | |
1 |
|