search query: @supervisor Koskinen, Jukka / total: 39
reference: 28 / 39
« previous | next »
Author:Tong, Shu
Title:Urea injection in power plants to reduce NOx emission
Publication type:Master's thesis
Publication year:2012
Pages:xi + 104 + [3]      Language:   eng
Department/School:Kemian laitos
Main subject:Tehdassuunnittelu   (Kem-107)
Supervisor:Koskinen, Jukka
Instructor:Savolainen, Kati
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto  2076   | Archive
Keywords:NOx emission
RRI
low-NOx burners
OFA
Abstract (eng): The EU Directive 2010/75/EU, Industrial Emissions Directive (IED), limited the NOx emission level < 200 mg/m3n at 6% O2 content from combustion plants into the air at 2016.
For achieving NOx emission limitation, Fortum is developing a new combustion technology which includes new third generation Low-NOx burners and advanced OFA system combining with rich reagent injection (RRI) in to the boiler.
The aim of the thesis was to study NOx reduction capability of RRI and the effect of reagent on the combustion system at PC firing Power Plants.

Two experiments were performed at Inkoo and Suomenoja Power Plants, in which Inkoo has a single wall firing boiler and Suomenoja has tangentially firing boiler.
During the test runs, the urea concentration was 32.5 wt. % and three types' urea spray nozzles were prepared to both Power Plants.
Coal samples and fly ash samples were collected and analysed in laboratory to determine the coal quality and UBC content and ammonia content in fly ash.
Gypsum samples and waste water samples were collected after FGD unit and analysed in laboratory in order to examine the ammonia content.
NOx emission was measured by NOx-analyser before the flue gas fan and FTIR was used to measure the gases concentration after the flue gas fan.

According to RRI test results, the NOx reduction was achieved 52 mg/m3n (13.5%) at Inkoo and 98 mg/m3n (21%) at Suomenoja with using C-type urea nozzle.
The results indicated that urea injection had no remarkable effect on increasing N2O emission, CO emission and UBC content in fly ash.
No ammonia slip was found in fly ash and FGD unit.
Urea injection had no negative effect on increasing water spray amount to superheater or reheater and steam temperature.
In addition, the tendency of NOx reduction was same for the CFD calculation and tests at Power Plants.
Based on the tests results and CFD modelling, optimizing existed combustion systems combined with RRI would achieve NOx emission < 200 mg/m3.
ED:2012-05-21
INSSI record number: 44601
+ add basket
« previous | next »
INSSI