Nature protection technologies

1.1.2.1. Performance-and-commissioning measures on nitrogen oxides emissions reduction

Part 1. AIR PROTECTION FROM POWER INDUSTRY EMISSIONS

1.1. Nitrogen oxide emission reduction

1.1.2. Technological methods for reduction of nitrogen oxide formation in boilers at combustion

of different types of organic fuel

1.1.2.1. Regime and commissioning activities for nitrogen oxide emission reduction

Roslyakov P.V., MPEI(TU)

The main advantages of this group of activities are their simplicity and no need to carry out reconstruction of the furnace-burner units. These activities can be conducted by the operational staff of TPP or alignment organization at oil-gas boilers and to a lesser degree – at coal-fired boilers.

A complex of the regime activities is shown in Fig. 1.2 which demonstrates the change in the concentrations of NOх and СО as a function of excess air (more precisely, the oxygen concentration in the combustion products of the combustion chamber).

1.1.2.1.1. Low Excess Air - LEA

One of the most common and easily implemented regime measures aimed at reduction of nitrogen oxide emissions is Low Excess Air in the furnace. As a result of reducing the oxygen content in the flame is suppressed formation of thermal and fuel NOх, and, therefore, this measure can be applied at combustion of all types of fossil fuel.

Part 1. AIR PROTECTION FROM POWER INDUSTRY EMISSIONS

1.1. Nitrogen oxide emission reduction

1.1.2. Technological methods for reduction of nitrogen oxide formation in boilers at combustion

of different types of organic fuel

1.1.2.1. Regime and commissioning activities for nitrogen oxide emission reduction

1.1.2.1.2. Non-stoichiometric combustion (Biased Burner Firing — BBF)

Roslyakov P.V., MPEI(TU)

Power boilers usually have several stages of burners or a few burners in one stage, at least. This allows to implement a method of non-stoichiometric combustion without any additional costs.

Non-stoichiometric combustion isn’t a conventional way of fuel combustion, arranging the separate reduction (α < 1) and oxidation (α > 1,2…1,25) combustion zones in the furnace while maintaining the traditional excess air at the furnace outlet. 

Part 1. AIR PROTECTION FROM POWER INDUSTRY EMISSIONS

1.1. Nitrogen oxide emission reduction

1.1.2. Technological methods for reduction of nitrogen oxide formation in boilers at combustion

of different types of organic fuel

1.1.2.1. Regime and commissioning activities for nitrogen oxide emission reduction

1.1.2.1.3. Burners Out оf Service — BOOS

Roslyakov P.V., MPEI(TU)

Method of Burners Out of Service consists in using one or more burners (preferably in the upper layer) for supplying only air with redistribution of the fuel loading to other burners.