Ultra-low nitrogen condensation waste heat steam boiler

Abstract

The invention relates to an ultra-low nitrogen condensation waste heat steam boiler. The ultra-low nitrogen condensation waste heat steam boiler comprises a boiler body, an ultra-low nitrogen burner,a fan, a condenser and an air preheater, wherein the boiler body comprises a water storage tank and a hearth; the hearth comprises a furnace liner and a back combustion chamber; a front smoke box is arranged at the open end of the hearth; the back combustion chamber communicates with the front smoke box through a plurality of smoke pipes; a heat exchange pipe and a smoke exhaust channel are arranged in the condenser; the water discharge end of the heat exchange pipe communicates with the water storage tank; the smoke exhaust channel communicates with the front smoke box through a smoke exhaustpipeline; the air preheater is positioned inside the smoke exhaust pipeline, and comprises an air circulation pipeline and a flue gas circulation pipeline at two ends separately communicating with the air outlet end of the fan and the air inlet end of the ultra-low nitrogen burner; and a smoke circulation pipeline for communicating the smoke exhaust pipeline with the air inlet end of the fan is also arranged outside the boiler body. The ultra-low nitrogen condensation waste heat steam boiler has the advantages that the combustion efficiency of fuel gas is improved, and the generation of NOx in the flue gas is further reduced.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to an ultra-low nitrogen condensing waste heat steam boiler. Background technique [0002] In order to meet the requirements of sustainable development of the national economy and environmental protection, coal-based fuels have been gradually changed to oil and gas-based fuels. Oil and gas fuels are easy to transport and use. Under good combustion conditions, there is basically no environmental pollution and high calorific value, which makes oil and gas boilers realize automatic operation and high efficiency. In recent years, fuel-fired gas-fired boilers have been widely developed and used due to their small size, high degree of automation, easy installation, and convenient and flexible application under various heat media. [0003] In traditional oil-fired gas-fired boilers, due to flue gas resistance, low-temperature corrosion and other reasons, the exhaust gas temperature of the...

AI Technical Summary

Problems solved by technology

At present, the thermal efficiency of boilers is calculated based on the low-level calorific value. Although the thermal efficiency is relatively high in name, the actual energy utilization rate needs to be improved due to the difference of about 10% between the high and low-level calorific value of natural gas.

In addition, the existing condensing waste heat recovery steam boiler mainly installs a waste heat recovery device outside the ordinary steam boiler, and through the circulation between the water supply tank and the condenser, the temperature of the boiler feed water is increased. The condenser is designed for normal pressure, and the efficiency is not significant.

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