Hot water unit

Abstract

The invention provides a hot water unit comprising a direct contact type heat exchanger (2), a total heat exchanger (3), a liquid distribution device (4) and a furnace pipe (5). The liquid distribution device (4) distributes hot water in the direct contact type heat exchanger (2), heat exchange is conducted directly between the hot water and smoke discharged by the furnace pipe (5), and the heatedhot water is conveyed to a heat user through a hot water outlet (7). The cooled smoke enters the total heat exchanger (3) through a smoke discharge connecting pipe (12), total heat exchange is conducted between the smoke and air coming in from the external environment, the heated and humidified air is conveyed to the furnace pipe (5) to serve as combustion air through an air pipeline (11), and the cooled and dehumidified smoke is discharged through a smoke outlet (13). Combustion temperature is lowered while smoke waste heat is recovered, and NOx emission is reduced. the structure is simplified, corrosion is avoided, and the problems that a boiler and a smoke waste heat recovery system are separated, and high cost, a complex structure and difficult operation are caused by combined operation are solved by overall ingenious design.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to a hot water unit. Background technique [0002] Gaseous fuels such as natural gas and liquid fuels such as diesel have relatively high hydrogen content, and the flue gas produced by combustion contains a large amount of water vapor, which is the main carrier of the heat of the flue gas. According to statistics, the heat carried by water vapor in natural gas flue gas accounts for about 10% of the low calorific value of natural gas. Therefore, the recovery of this part of heat (mainly latent heat) is economically meaningful. [0003] At present, there are many waste heat recovery technologies that recover sensible heat and latent heat in flue gas at the same time, and some of them have been popularized and applied on a large scale, such as the centralized heating system that uses absorption heat pumps to recover flue gas waste heat. The combination of water direct contact heat ex...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a hot water unit, through the overall design and ingenious connection among the heat exchanger, combustion device and heating system, the high temperature flue gas of the hot water unit can directly contact and exchange heat with hot water, and The exhaust gas temperature is finally reduced to below the dew point temperature, and the waste heat of the flue gas discharged from the hot water unit is completely recovered, which solves the complex structure and land occupation caused by the boiler adopting partition wall heat exchange and the separate setting of the flue gas waste heat recovery system. Problems such as large area, high cost, and difficult operation adjustment

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