Abstract
The flow field in the superheater region of a recovery boiler has a great effect on the heat transfer to the superheaters. By optimizing the How field, it is possible to utilize the heat transfer surfaces better and improve the total heat transfer to the superheaters. When the heat transfer performance is optimized, the area of the superheaters can be minimized, which leads to substantial cost reductions. The objective of this work is to find a superheater region design that maximizes the heal transfer to the superheaters in a typical modern 7000 tds/d recovery boiler. The optimization procedure is carried out by using a developed program which combines a simulated annealing (SA) optimization method, a polynomial regression surrogate model, and a superheater region computational fluid dynamics (CFD) model in a novel way. The present study is the first work that uses optimization coupled with CFD to investigate the superheater region of a recovery boiler. The optimization program found a large number of designs that improve the heat transfer to the superheaters, compared to the initial design. We chose two designs, A and B, among the best designs found and propose them as alternatives for an improved superheater region design. The design A, which is the best design found during the optimization, is characterized by a large furnace nose, and it improves the heat transfer to the superheaters by 5%. The design B, which conversely has a small furnace nose, improves the heat transfer by 3%. The results of this work can be used to redesign the superheater region with less superheating surface than in the original design. This will lead to major cost reductions, considering the large size of the boiler and the expensive materials required in the superheaters.
Original language | English |
---|---|
Title of host publication | PEERS Conference 2015 |
Publisher | TAPPI Press |
Pages | 717-730 |
Number of pages | 14 |
Volume | 2 |
ISBN (Electronic) | 9781510817586 |
Publication status | Published - 2015 |
MoE publication type | A4 Conference publication |
Event | TAPPI PEERS Conference - Atlanta, United States Duration: 25 Oct 2016 → 28 Oct 2016 |
Conference
Conference | TAPPI PEERS Conference |
---|---|
Country/Territory | United States |
City | Atlanta |
Period | 25/10/2016 → 28/10/2016 |