Spray type flue gas waste heat recycling device

Abstract

The invention relates to the technical field of flue gas recycling and discloses a spray type flue gas waste heat recycling device. The spray type flue gas waste heat recycling device comprises a flue gas waste heat deep-recycling unit and a flue gas purifying unit. The flue gas waste heat deep-recycling unit comprises a main tower body, a first heat exchanger and a second heat exchanger. A water source is connected with the second heat exchanger and the first heat exchanger through water inflow pipes. The main tower body comprises a condensation water collection segment and a spray heat exchange segment. Fuel gas enters the spray heat exchange segment through a fuel gas pipe. The first heat exchanger is arranged in the fuel gas pipe. The condensation water collection segment is connected with the second heat exchanger through a water outflow pipe. The fuel gas purifying unit comprises an oxidization device communicated with the fuel gas pipe. According to the spray type fuel gas waste heat recycling device, the fuel gas waste heat deep-recycling unit and the fuel gas purifying unit are arranged so that fuel gas waste heat can be recycled in a graded manner and pollutants in fuel gas can be purified, and the fuel gas waste heat deep-recycling function and the fuel gas purifying function are integrated in a coordinative manner.

Description

technical field [0001] The invention relates to the technical field of flue gas recovery, in particular to a spray type flue gas waste heat recovery device, in particular to a spray type flue gas waste heat recovery device capable of deeply recovering waste heat and purifying flue gas at the same time. Background technique [0002] At present, the exhaust gas temperature of traditional natural gas boilers operating in China is generally 150-250 °C. After combustion, the flue gas will generate water vapor with a volume share of about 20%, theoretically 1Nm 3 Natural gas combustion can produce 1.5Kg water vapor. The latent heat of vaporization released by the complete condensation of 1Kg of water vapor at 20°C is 2453KJ. Thus, 1Nm 3 The water vapor generated by the combustion of natural gas will contain about 3.6MJ of heat. The recovery of physical sensible heat and latent heat of vaporization in the flue gas can provide an energy utilization rate of more than 10%, which h...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing partition-type flue gas waste heat recovery equipment has partition thermal resistance, the recovery ratio of latent heat in the flue gas is relatively low, and the requirements for equipment anti-corrosion are high; the direct contact flue gas waste heat recovery equipment has no Questions about taking measures for flue gas purification

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