New Generation of Premix Gas Blowers

摘要

Dramatic improvements in the control and efficiency of gas burner systems is now possible with a new generation of premix gas blowers recently introduced to the North American market. The premix gas blowers are for fixed or modulating gas-fired burner systems rated up to 1,500,000 Btu/hr (～450 kW). Applications include residential and commercial gas furnaces, humidifiers, water heaters, gas-fired food service equipment, and hydrogen fuel cells. The premix gas blowers deliver a measured air-fuel mixture to the burner with turndown ratios up to 10:1. The gas is injected either at the fan inlet or outlet to ensure optimum combustion efficiency resulting in lower NOx and CO emissions. Product features include die-cast aluminum gas tight housings, antistatic backward curved impellers, resilient motor mounts, AC shaded-pole or brushless DC motors, pulse width modulation (PWM) input for speed control, Hall effect sensor for speed monitoring, optical isolation of AC voltage input from DC controls, and an inlet flange to accept specialty gas valves. In the new millennium, increased energy and environmental demands will be placed on appliance and combustion engineers. Premix gas blower technology will be a solution to meet these demands.