Heat recovery system

Abstract

The invention provides a gas low-temperature smoke full-heat recovery system for overcoming the defects of the prior art. High-temperature heat users and middle-temperature heat users of a heat supply system are in series connection in a grading manner, a submersible pump is connected with a high-temperature water main pipe, a natural gas inlet pipe is connected with a natural gas burning device, a high-temperature flue is connected with an energy economizer and the natural gas burning device, a low-temperature flue is connected with dividing wall type heat exchangers and the energy economizer, three dividing wall type heat exchangers are sequentially connected in series along the smoke flow direction, a smoke condensed water centrifugal separator is tangentially connected with the dividing wall type heat exchangers, a flue outlet section is connected with the center of the smoke condensed water centrifugal separator, the bottom of the smoke condensed water centrifugal separator is connected with a water collection well, and the bottom of the water collection well is connected with a condensed water pipe and a water discharging pipe through pipelines. The full-heat recovery system for low-temperature smoke of the gas has the characteristics of simplicity in structure, convenience in operation and adjustment, remarkable energy-saving effect and the like.

Description

technical field [0001] The invention relates to an energy recovery system, in particular to a total heat recovery system for gas low-temperature flue gas, and belongs to the technical field of heat exchange. Background technique [0002] The exhaust gas temperature of existing natural gas combustion devices is very high. Since natural gas contains more hydrogen, the water vapor generated by combustion is also relatively large. In order to recover the sensible heat of flue gas and the latent heat of water vapor, an economizer, The air preheater and spraying device are used to recover heat. The additional economizer and air preheater are recovered through the partition heat exchange device. Because the specific heat of air is relatively low, it is difficult to use the air preheater to recover flue gas The latent heat of water vapor in the gas is usually discharged when the temperature of the flue gas is reduced to about 50°C. In this way, part of the sensible heat and latent h...

AI Technical Summary

Problems solved by technology

[0002] The exhaust gas temperature of existing natural gas combustion devices is very high. Since natural gas contains more hydrogen, the water vapor generated by combustion is also relatively large. In order to recover the sensible heat of flue gas and the latent heat of water vapor, an economizer, The air preheater and spraying device are used to recover heat. The additional economizer and air preheater are recovered through the partition heat exchange device. Because the specific heat of air is relatively low, it is difficult to use the air preheater to recover flue gas The latent heat of water vapor in the gas is usually discharged when the temperature of the flue gas is reduced to about 50°C. In this way, part of the sensible heat and latent heat in the flue gas can be recycled. However, the gas flue gas at about 50°C still contains about half of the latent heat that has not been recovered.

For the heat recovery of the spraying device, for example, CN201120133195.9 discloses a "centralized heating system using an absorption heat pump to recover waste heat from flue gas", which uses direct contact heat exchange between flue gas and water to recover waste heat from flue gas. The absorption heat pump unit is adopted, which occupies a relatively large area and requires relatively high construction requirements.

Images