Deep utilization of heat energy in exhaust gas and method of using its aqueous vapour as natural resources

Abstract

The present invention discloses a method for deep utilizing heat energy of flue gas and makes its water vapour as resource, the flue gas from the boiler containing high content of moisture is separated into two parts, one part of flue gas is passed through heat exchanger to make the temperature of flue gas down to below the dew point of aqueous vapour, the low-quality heat quantity discharged from flue gas is absorbed by the refrigerant medium and realizes the deep utilization of flue gas heat energy, and the same time, the aqueous vapour of flue gas is condensed and recovered, then treated for use by the agritural and the industrial production and the daily life use.

Description

1. Technical field [0001] The invention belongs to the field of thermal energy utilization, and relates to a thermal energy utilization method, in particular to a method capable of realizing deep utilization of flue gas thermal energy and resource utilization of water vapor therein. 2. Background technology [0002] At present, the commonly used boilers, whose fuels (including coal, oil and natural gas) are burned, produce flue gas and flue gas with relatively high exhaust temperature, and have a considerable part of heat energy (especially when the flue gas contains water vapor with high enthalpy and high proportion). ) is discharged into the atmosphere through the chimney, resulting in a great waste of heat energy, and the smoke exhaust is not clean. In ordinary conventional boilers, water vapor is not utilized as a resource, but flows down the chimney when it encounters cold in the chimney, causing corrosion and scaling of the chimney. [0003] According to the data retr...

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Problems solved by technology

[0004] 1) In the utility model patent "Boiler waste heat recovery device" with the patent application number of 99222731.3, although the waste heat of the flue gas has been utilized, when the high-moisture flue gas flows through the waste heat recovery device, the temperature of the flue gas will drop. large amount of condensed water

If the condensed water is not discharged from the flue in time, a large amount of water will accumulate in the chimney and the corrosion will be serious. Moreover, after 100% of the flue gas passes through the waste heat recovery device, the temperature of the flue gas is very low, which is not conducive to the flow of flue gas in the chimney.

[0005] 2) In the patent "Condensing type boilers" with US Patent No. 4998508, although the thermal energy utilization of flue gas is high, there is also the problem of recovery of condensed water in flue gas, and this type of boiler is an integral boiler with a relatively complicated structure , not suitable for use in boilers with large capacity and high pressure parameters, and the scope of use is limited

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