Contact-type advanced recycling system for waste heat of low-temperature flue gas

Abstract

The invention relates to a contact-type advanced recycling system for the waste heat of low-temperature flue gas, and belongs to the technical field of the advanced recycling of the waste heat of the flue gas. The system comprises a contact-type advanced recycling subsystem for the waste heat of the low-temperature flue gas, a heat storage and water quality maintaining purification subsystem and a waste heat output utilization subsystem, wherein the contact-type advanced recycling subsystem for the waste heat of the low-temperature flue gas mainly comprises a water retaining condenser with a multifunctional fin, a water distributor, a contact-type spray tower and a spray pump; the heat storage and water quality maintaining purification subsystem mainly comprises a hot water sedimentation water storage tank, a drainage pipe, an overflow pipe, a circulating pump and an full-automatic water quality measuring control maintainer; and the waste heat output utilization subsystem mainly comprises a plate-type heat exchanger and a water feeding pump. By utilizing the contact-type advanced recycling system, the sensible heat of the flue gas is recovered, and a large amount of water vapor latent heat in liquid and gas fuel flue gas is also recovered; therefore, the contact-type advanced recycling system has the effects of washing and purifying the flue gas and the effects of washing and weakening acid corrosion on equipment and flues.

Description

technical field [0001] The invention belongs to the technical field of deep recovery and utilization of waste heat of flue gas using liquid and gas as fuel, and particularly relates to a direct contact deep recovery and utilization system of waste heat of low-temperature flue gas. Background technique [0002] With the adjustment of China's energy structure, the consumption and proportion of diesel (heavy) oil and natural gas are increasing rapidly. The exhaust gas temperature at the outlet of oil-fired, gas-fired boilers, gas-steam combined cycle, and large internal combustion engine waste heat boilers is generally between 160 and 180°C or higher. At this time, the temperature of the flue gas is low, the energy flow density is small, and it no longer has the ability to work or the economic value of heat utilization. It is a waste energy that has not been fully recycled at this stage. Today, energy issues are increasingly becoming the bottleneck of social and economic devel...

AI Technical Summary

Problems solved by technology

The thermal resistance of flue gas on the surface of these heat exchangers is large, and the range of enhanced heat transfer coefficient is K=30~200W / m 2 °C, and the heat transfer temperature difference of the low-temperature flue gas is small, which will inevitably result in a huge volume, high cost and limited application of the flue gas waste heat recovery equipment

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