A condensing vacuum boiler

Abstract

The invention discloses a condensation type vacuum boiler. The condensation type vacuum boiler comprises an air blower, an air preheating device, a combustor, a combustion chamber and a smoke waste heat recovery device. High-temperature smoke generated by combustion in the combustion chamber of the condensation type vacuum boiler passes through the smoke waste heat recovery device and the air preheating device which are sequentially connected in series, heat exchange of the high-temperature smoke and return water coming from a user system and heat exchange of the high-temperature smoke and cold air introduced into the air preheating device through the air blower are conducted, a large amount of smoke waste heat is recovered, and the utilization rate of the exhaust smoke waste heat of the condensation type vacuum boiler is increased. The combustor in the premixing planar combustion mode is adopted by the condensation type vacuum boiler to directly heat vertically arranged tube bundles of a liquid tube nest in the combustion chamber, and thus the heat exchange efficiency of the boiler can be improved, the structure of the condensation type vacuum boiler is more compact, the size of the boiler is reduced, the content of pollutants such as NOx and CO can be effectively restrained, pollution emission is reduced, and the economic benefits and social benefits of energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a condensing vacuum boiler capable of deep recovery and utilization of flue gas waste heat. Background technique [0002] Vacuum boilers work by using the characteristics of water with different boiling temperatures under different pressures. For example: under an atmospheric pressure, the boiling temperature of water is 100°C, and under the pressure of 6mmHg, the boiling temperature of water is 4°C, and the vacuum boiler works within the pressure range of 20mmHg to 500mmHg, and the corresponding outlet water temperature is 15℃~80℃. Under the working pressure of the vacuum boiler, the combustion makes the temperature of the heat medium water rise to the saturation temperature, and steam of the same temperature is generated on the water surface. The cold water is passed through the heat exchanger, and the cold water in the tube is heated by the steam outside the tube to become wa...

AI Technical Summary

Problems solved by technology

[0003] Most of the current vacuum boilers use the combustion heat generated by the burner to heat the refrigerant water inside the boiler, and the temperature of the generated flue gas is about 170°C, and this part of the exhaust heat is directly discharged through the chimney. However, this part of the waste heat includes both smoke The sensible heat of the gas contains a large amount of latent heat of water vapor (1Nm 3 Natural gas can produce 1.55kg of water vapor after combustion), and 17% of its fuel heat is not effectively utilized, resulting in waste of this part of waste heat, and at the same time generating emission pollution

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