The primary demands of a process burner are flame geometry, combustion performance maintained over wide turndown ratios to handle fluctuating load demands and spinning reserves with minimum draught loss to conserve power. Wesman's Pressure Jet burners fullfill the above mentioned requirements along with the added bonus of reducing running costs and being competitive from a capital cost stand point.
The burner is designed to divide the air stream into primary and secondary air. The primary air flow is through the central tube, discharging via an axial flow stabilizer. The secondary air passes through the annular section, over swirl vanes which are fixed in a pre-determined angle and discharges through a convergent/ divergent throat.
The primary section remains constant for flame stability, while variations to the secondary vane angle and throat convergent/divergent angles provide mixing of fuel and air for performance over a wide variation in flame shape requirements. The burner comes either with an independent windbox and air isolating damper, or as a multi-burner windbox installation fitted with a sleeve-type air door.
Requirements for wide turndown and high performance present problems for mechanical atomizers, such as varying spray angle and poor atomization, while in steam atomizers these remain constant. Steam atomizers also show savings over mechanical atomizers due to lower operating pressure. Atomizing steam is held at constant pressure regardless of turndown, eliminating control loops required for a constant differential systems. Steam consumption ranges from 3% to 10% depending on the type and the quality of fuel, atomizing steam condition and the application. Compressed air can also be used for atomizing.
The L-Series burner delivers low excess air, low atomizing, wide turndown with wide stability limits, and heat recovery using preheated combustion air. The combination of the register and internal mix steam atomizer can achieve combustion figures of 0.5% O2 100 mg/Nm3 stack solids (excluding fuel ash). Combustion air preheat up to 4500C can be used, wih preheat temperatures above this requiring heat resistant materials.
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