146
Z. Liu et al.
Table 12.2 External loads on nozzles
Force (N)
Moment (N·m)
Fx
Fy
Fz
Mx
My
Mz
Air inlet nozzle
−66,100
18,800 −32,600 −23,100
79,200
−5000
Air outlet nozzle
5000
50,700
20,200
35,000
13,700 −25,200
Table 12.3 Pressures in load
cases for static strength
assessment
Static load cases
Case 1
Case 2
Plate-side pressure(MPa)
0.1
0
Shell-side pressure(MPa)
0
0.4
Fig. 12.2 Loads and
constraints in case 1
As shown in Fig. 12.3, in case 2, only the shell-side surface of the heat exchanger
was loaded with the pressure of 0.4 MPa. The equivalent force applied to the water
outlet and inlet nozzles is 3.765 MPa. Fixed constraint was imposed on the supporters.
12.3 Strength Assessment Based on Elastic Stress Analysis
Method
Elastic Stress Analysis Method assumes the material of the equipment is linear elastic.
Stresses on the equipment will be classified into different categories in terms of
Mises equivalent stress. Different categories of stresses will be limited with different
allowable values according to their effects on the possible strength failure of the
equipment. The allowable stress S for S30408 at the design temperature is 134.2 MPa.
The Mises equivalent stress distributions at the plate heat exchanger under
different working cases were shown in Figs. 12.4–12.5.
Z. Liu et al.
Table 12.2 External loads on nozzles
Force (N)
Moment (N·m)
Fx
Fy
Fz
Mx
My
Mz
Air inlet nozzle
−66,100
18,800 −32,600 −23,100
79,200
−5000
Air outlet nozzle
5000
50,700
20,200
35,000
13,700 −25,200
Table 12.3 Pressures in load
cases for static strength
assessment
Static load cases
Case 1
Case 2
Plate-side pressure(MPa)
0.1
0
Shell-side pressure(MPa)
0
0.4
Fig. 12.2 Loads and
constraints in case 1
As shown in Fig. 12.3, in case 2, only the shell-side surface of the heat exchanger
was loaded with the pressure of 0.4 MPa. The equivalent force applied to the water
outlet and inlet nozzles is 3.765 MPa. Fixed constraint was imposed on the supporters.
12.3 Strength Assessment Based on Elastic Stress Analysis
Method
Elastic Stress Analysis Method assumes the material of the equipment is linear elastic.
Stresses on the equipment will be classified into different categories in terms of
Mises equivalent stress. Different categories of stresses will be limited with different
allowable values according to their effects on the possible strength failure of the
equipment. The allowable stress S for S30408 at the design temperature is 134.2 MPa.
The Mises equivalent stress distributions at the plate heat exchanger under
different working cases were shown in Figs. 12.4–12.5.