Title:
DEVICE AND METHOD FOR REDUCING OXYGEN IN BOILER EXHAUST GAS
Document Type and Number:
Japanese Patent JP3643676
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a nitrogen gas with a low power and at a low cost by providing a combustion catalyst portion at the downstream of or at the intermediate portion of a boiler convection heat transfer portion and supplying an oxygen reducing fuel right in front of the combustion catalyst portion.
SOLUTION: The heat transfer system of a boiler 1 is constructed such that water is supplied to the boiler 1 through a water supply inlet 4 by way of a preheater, the water is fed to a radiation evaporator 2 by way of an economizer 5, and the radiation economizer 2 includes a large number of water tubes 6 which are arranged in parallel and repeats combining and splitting of water by means of headers 7 so as to make the flow of water in respective water tubes 6 uniform. Then, an approximately 85% of supply water is evaporated in this radiation evaporator 2 with combustion heat of a boiler fuel and an ensuing remaining portion evaporator 3 evaporates the remaining water and heats a part thereof. In such a construction, a combustion catalyst portion 11 is provided at the downstream of a boiler convection heat transfer portion which is made of a contact superheater 9, the remaining portion evaporator 3 and a fuel supply device 12 supplies an oxygen reducing fuel in front of the fuel catalyst portion 11.
Inventors:
Masaki Iijima
Tetsuya Imai
Tetsuya Imai
Application Number:
JP19092497A
Publication Date:
April 27, 2005
Filing Date:
July 16, 1997
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
International Classes:
F23J15/00; B01D53/86; B01J19/14; E21B43/16; F23C6/04; F23G7/06; F23G7/07; (IPC1-7): F23C6/04; F23G7/06; F23J15/00
Domestic Patent References:
| JP64031305U | ||||
| JP61272509A | ||||
| JP5937917U | ||||
| JP8158774A | ||||
| JP3258340A |
Attorney, Agent or Firm:
Nao Okuyama
Arihara Koichi
Shoichi Okuyama
Arihara Koichi
Shoichi Okuyama