Which of the following is essential for proper combustion in a boiler?

Proper combustion in a boiler relies heavily on the management of air supply and the removal of combustion gases. Draft control is essential in ensuring that there is a consistent and adequate flow of air into the combustion chamber. This flow allows for the optimal mixing of fuel with air, which is critical for maintaining efficient combustion processes.

Effective draft control helps achieve the right balance between the fuel and oxygen, prevents the buildup of unburned fuel, and helps in the proper evacuation of combustion byproducts. When draft control is managed adequately, it can lead to improved combustion efficiency, reduced emissions, and enhanced overall performance of the boiler system.

In contrast, factors such as high humidity, excessive heat, or low oxygen levels can negatively impact combustion. High humidity can lead to reduced combustion efficiency, as it displaces some of the necessary oxygen. Excessive heat alone does not ensure proper combustion, as the quality of the air-fuel mix is paramount. Additionally, low oxygen levels hinder the combustion process itself, leading to incomplete combustion and increased emissions. Thus, draft control stands out as a crucial element for achieving effective and efficient combustion in a boiler.