Environmentally Oriented Modernization of Power Boilers

Environmentally oriented modernization of power boilers explains how to retrofit and upgrade power boilers in aging thermal and CHP plants, with emphasis on pulverized fuel boilers (PF). The work provides direct avenues to higher boiler efficiency, harmful emissions reduction, fuel grinding system modernization, fuel flexibility, boiler operation flexibilization, reduced corrosion, erosion, and fouling. It also explores how to integrate emission reduction systems into boiler operations. The work is planned for engineers and graduate students as well as for power plant management. For the latter, it helps find the best solution for the necessary modernization and functions as an aid in organizing tenders as well as in evaluating projects offered.

• Presents, in a clear and accessible way, the most important solutions related to boiler emissions reduction, including CO2 emissions
• Helps increase boiler efficiency through technical and operational upgrades
• Helps increase the usefulness of boilers by increasing fuel and operational flexibility
• Supports reduction of harmful phenomena, such as corrosion, erosion, and fouling
• Accompanied with a careful selection of realized modernizations, including pitfalls and best practice discussion
• Chapters are presented alongside hundreds of literature references for further study

Power and mechanical engineers in power plants, power boiler designers and manufacturers, and environmental compliance practitioners. Graduate and early career researchers in energy and power engineering

1. INTRODUCTION

2. BOILER EFFICIENCY AND THERMAL LOSSES

3. MODERNISATION TO REDUCE THE FLUE GAS LOSS
3.1. Lowering of flue gas temperature
3.2. Selection of the minimum flue gas temperature at the boiler outlet
3.3. Optimisation of flue gas outlet temperature
3.4. Lowering the air excess number in the boiler

4. REDUCTION OF NITROGEN OXIDE EMISSIONS
4.1. Formation of nitrogen oxides
4.2. Impact of operating conditions of the furnace on emissions of nitrogen oxides
4.3. Methods of reduction of nitrogen oxide emissions in PF boilers
4.4. Secondary methods of NOx reduction
4.5. NOx reduction methods without the use of ammonia or urea
4.6. Combined methods of NOx control
4.7. The future of NOx emission reduction methods

5. MODERNISATION OF FUEL GRINDING SYSTEMS
5.1 Quality of pulverised coal
5.2 Coal mills
5.3 Modernisations of coal mills arising from low-NOx combustion
5.4 Modernisation to improve the operating conditions of pulverisers in dynamic states
5.5 Modernisation of pulverisers to reduce harmful emissions

6. REPLACING COAL WITH OTHER FUELS
6.1. Introduction
6.2. Replacement of coal with natural gas
6.3. Replacement of coal with blast furnace gas and low quality syngas
6.4. Replacement of coal with fuel oil
6.5. Replacement of hard coal with lignite
6.6. Modernisation for the combustion of various fuels in the same boiler

7. ADAPTATION OF BOILERS FOR BIOMASS BURNING
7.1. Types of biomass used in the power industry
7.2. Adaptation of PF boilers for biomass burning
7.3. Complete replacement of coal with biomass

8. HARMFUL PHENOMENA IN MODERNISED BOILERS
8.1. HT corrosion on the flue gas side
8.2. LT corrosion on the flue gas side
8.3. Fly-ash erosion
8.4. Fouling
8.5. Slagging
8.6. Condensation of sulphates

9. CONVERSION OF AN EXISTING BOILER TO A CONDENSING BOILER
2.1. Condensing technology
2.2. Industrial applications

10. INCREASING FLEXIBILITY OF BOILER OPERATION
10.1. Adaptation of the boiler to work with a load higher than nominal
10.2. Lowering the minimum boiler load
10.3. Frequent start-ups and large and rapid load changes
10.4. Increasing flexibility of boiler pressure parts

11. INTERACTIONS BETWEEN EMISSION REDUCTION SYSTEMS
11.1. Introduction
11.2. Interactions between NOx reduction systems and dust removal systems
11.3. Interactions between SOx reduction systems and dust removal systems
11.4. Influence of flue gas dedusting and NOx reduction systems on wet FGD