zozen boiler
Home Service FAQs FAQ of coal-fired boilers What are factors affecting the coal-fired boiler efficiency?

What are factors affecting the coal-fired boiler efficiency?

05 Mar 2021

The efficiency of a coal-fired boiler depends on the loss of the boiler, the best efficiency in the boiler can be achieved if the losses are kept to the minimum. Since 50% of the losses are dependent on the fuel and ambient condition, the best efficiency can be achieved by properly tuning the other 50%, i.e. mainly carbon loss and dry gas loss.

Factors affecting carbon loss

Coal rank and quality

Coal petrographic characteristics

Characteristics and quantum of carbonaceous shale

Presence of low melting inorganics in coal ash

Residence time available for combustion in furnace

Type and number of burners

Type of milling system and primary air control system

Fineness of pulverised coal - percentage of coarser particles

Primary air to secondary air ratios

Excess air at the burner/furnace and distribution of air into the burner/furnace

Burner tilt (if provided)

The factors having the greatest influence on carbon loss are the boiler type, volatile matter content in the coal, furnace heat loading (heat input/furnace volume), mass fraction of pulverised coal smaller than 75 mm and excess air

Factors affecting dry gas loss

Keep an optimal excess air level, generally about 20% in a coal fired boiler

Tune combustion of coal to the optimal condition

Understand the coal being fired

Proper distribution of combustion air at primary, secondary, and tertiary levels

Keep the required fineness of coal about 75% through 200 mesh and less than 2% on 50 mesh sieve

Keep the maximum mill outlet temperature to reduce air bypassing air pre-heater

Soot blowing the entire heat transfer surface at an optimal frequency

Minimize the air in leakage to the boiler

Dry gas loss is also influenced by the economizer feed water inlet temperature and the ambient air temperature, which change the heat recovery pattern of economizer & air-pre-heater

Related news View More
  • ZOZEN Boiler in Shandong: Innovative Boiler Models Empower Diverse Production
    On the thriving industrial land of Shandong, the continuous demand for thermal energy supply from enterprises drives the transformation of the boiler industry. With profound technical expertise and ongoing innovation, ZOZEN Boiler remains at the forefront of providing high-quality, adaptable boiler models for various industries.   ZOZEN Boiler Provides Tailored Boiler Solutions for Shandong Industries   Looking back, the cooperation projects with Shandong Luhua Group and Shandong...
    29 Jul 2025
  • ZOZEN Gas Water Tube Boilers Make a Strong Entrance on Cable Industry
    In the industrial zone of Wen’an County, Xinghua Cable Co., Ltd. is making steady progress on its project with an annual production capacity of 11 million meters of wires, cables, and accessories, backed by an investment of RMB 520 million. Upon completion, the project is expected to create over 150 jobs and generate annual sales revenue of RMB 800 million, demonstrating promising prospects. As a key supplier of thermal energy equipment, ZOZEN Boiler is quietly supporting the development o...
    22 Jul 2025
  • ZOZEN Boiler Facilitates Power Plant “Oil-to-Gas” Upgrade
    On March 20, 2025, the Guizhou Jinyuan Zhijin “Replacing Small Units with Large Ones” Relocation Project (2×660 MW), under State Power Investment Corporation, successfully achieved the first ignition of its boiler. This project replaced traditional oil-fired ignition fuel with liquefied natural gas (LNG), setting a new precedent for employing clean energy in 660 MW ultra-supercritical “W” flame boilers. As a key equipment supplier for this project, ZOZEN Boiler prov...
    15 Jul 2025

Find the Right Boiler For You

Name *

Email *

WhatsApp/WeChat

Products

Power/Capacity