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

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