Natural gas boiler flue gas waste heat recycling system

Abstract

A natural gas boiler flue gas waste heat recycling and reusing system comprises a natural gas boiler, a waste heat recycling system and a waste heat reusing system, the waste heat recycling system comprises a spraying tower, a spraying water tank and a circulating pump, and the spraying tower comprises a flue gas inlet, a flue gas outlet, a spraying liquid inlet, a spraying liquid collecting pool and a spraying liquid outlet, the flue gas inlet is located at the bottom of the spray tower, the flue gas outlet is located at the top of the spray tower, and the two are diagonally arranged; a water falling film assembly is also arranged in the spray tower, and the water falling film assembly enables spray liquid to form a liquid film on the surface of the water falling film assembly; and the waste heat recycling system is in coupling connection with the waste heat recovery system and comprises a heat pump system and a heat supply pipe network. According to the technical scheme disclosed by the invention, the plurality of liquid film plates are arranged in the spray tower according to a certain position, height and interval, so that the spray liquid forms a water falling film in the spray tower, the heat exchange efficiency of flue gas and the spray liquid is improved, and the device has a remarkable effect on flue gas waste heat recovery of the natural gas boiler and can be used repeatedly.

Description

Technical field [0001] The present invention belongs to the energy field, and more particularly to a natural gas pot furnace smoke heat recovery and re-use system. Background technique [0002] In the current industrial production in my country, the natural gas boiler used has a low calorie utilization rate, and the exhaustive temperature is high, and the recycling of flue gas waste heat resources is an effective way for energy conservation and emission reduction. Domestic natural gas boiler flue gas exhaust temperature can be as high as 140-200 ° C, in which a large amount of energy is carried; the natural gas component is mainly methane, and the water vapor volume fraction of the exhaust smoke accounts for about 20%, a large amount of water vapor. As the latent heat is discharged from the waste of resources, the recovery method for smoke reduction is mainly used for heat transfer medium with high temperature flue gas in heat exchanger, how to improve heat exchange efficiency is...

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Problems solved by technology

[0002] In my country's current industrial production, the natural gas boilers used generally have problems such as low heat utilization rate and high exhaust temperature. For the current energy shortage situation, the recovery and utilization of waste heat resources of flue gas is an effective way to save energy and reduce emissions. The flue gas temperature of domestic natural gas boilers can be as high as 140-200°C without treatment, which carries a lot of energy; the main component of natural gas is methane, and the water vapor volume fraction in the exhaust flue gas accounts for about 15%-20%, a large amount of water vapor As the latent heat is directly discharged to cause waste of resources, the current recovery method for flue gas waste heat mainly uses the heat exchange medium in the heat exchanger to exchange heat with high-temperature flue gas. How to improve the heat exchange efficiency is the main problem for those skilled in the art at this stage. Research objectives

[0003] Existing patents for flue gas waste heat recovery through direct or indirect contact between flue gas and water include: (1) Invention patent CN200710100388.2, which discloses a water-spraying plastic film flue gas waste heat recovery and desulfurization device, this device performs indirect contact countercurrent heat exchange between flue gas and water through a thin film, but its flue gas side resistance is relatively large

(2) Invention patent CN200720048437.8 discloses an energy-saving device for waste heat recovery of flue gas. This device is equipped with a water supply atomization device on the flue for direct contact heat exchange between flue gas and water. The working efficiency of this device is not high and occupies The ground area is large and there is no discussion of the subsequent use of recovered heat

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