Flue gas heat exchange device of oil field gas injection boiler and heat exchange method thereof

Abstract

The invention discloses a flue gas heat exchange device of an oil field gas injection boiler and a heat exchange method thereof. The device comprises an air heat exchanger and a condensing heat exchanger, wherein an air intake system of the air heat exchanger comprises a blower fan and an air duct, the air duct is communicated with an air inlet of the air heat exchanger, an air outlet of the air heat exchanger is communicated with a hot air inlet of the boiler, a flue gas inlet of the air heat exchanger is communicated with the boiler through a flue, a flue gas outlet of the air heat exchanger is communicated with the condensing heat exchanger via the flue provided with a draught fan, a water inlet and a water outlet are arranged on the condensing heat exchanger, and a condensed water pool is arranged at the lower part of the condensing heat exchanger. The method is accomplished by adopting the heat exchange device. In the device, sensible heat of the flue gas is recovered by the air heat exchanger, condensed latent heat of the flue gas is absorbed by the condensing heat exchanger, and the sensible heat and the latent heat of the flue gas are well absorbed by reasonably configuring the heat exchange temperatures of the air heat exchanger and the condensing heat exchanger, thus the advantages of effectively reducing energy consumption, improving boiler efficiency and saving plenty of energies are achieved.

Description

technical field [0001] The invention relates to an oil field gas injection boiler flue gas heat exchange device and a heat exchange method thereof. Background technique [0002] In the field of thermal energy engineering, the thermal efficiency of boilers is calculated based on the low calorific value of fuel, and it is the same in foreign countries. The exhaust gas temperature of gas injection boilers in oil fields is about 180-200 °C, and the temperature of boilers with heat exchangers is also above 140 °C. . The water vapor in the flue gas is in a superheated state, and it is impossible to condense into water and release the latent heat of gasification, wasting a lot of heat. At present, gas injection boilers in oil fields mostly use natural gas. The main component of natural gas is methane, and its equation is CH 4 +2O 2 =CO 2 +2H 2 O+ heat, as can be seen from the combustion equation of natural gas, every burning 1Nm 3 The natural gas produces about 21Nm 3 The l...

AI Technical Summary

Problems solved by technology

When the exhaust gas temperature is high, the water vapor cannot condense to release heat, and the heat is wasted as the gas is discharged.

At the same time, the high-temperature flue gas also takes away a large amount of sensible heat, resulting in a large exhaust heat loss.

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