Method and device for recycling low temperature exhaust heat through carbon dioxide humidifying

Abstract

The invention relates to a method and a device for recycling low temperature exhaust heat through carbon dioxide humidifying, which belong to the technical field of production comprehensive utilization of chemical enterprises. The technical scheme is that the device is provided with a humidifying tower, carbon dioxide gas is in countercurrent contact with hot water used for recovering the low temperature exhaust heat below 150 DEG C in the humidifying tower, heat in water is directly transferred to the carbon dioxide gas through a mass and heat transferring effect, partial water is transferred to the carbon dioxide gas in a water vapor mode, moisture content in the carbon dioxide gas is substantially improved, temperature of the mixed gas of carbon dioxide and water vapor is increased, and impurities in the water are transferred to the mixed gas of the carbon dioxide and the water vapor simultaneously. The mixed gas of the carbon dioxide and the water vapor at an outlet of the humidifying tower serves as a gasifying agent of a gas producer. The method and the device use the existing gas producer device and process conditions, less equipment is added, and the method and the device has strong practical applicability and exploitativeness and are less in investment and low in cost.

Description

technical field [0001] The invention relates to a method and device for humidifying carbon dioxide and recovering and utilizing low-temperature waste heat, belonging to the technical field of comprehensive utilization of production in chemical enterprises. Background technique [0002] In the field of industrial production, the heat of the medium below 150°C is called low-temperature waste heat. In various industrial production fields, there is a large amount of low-temperature waste heat, most of which are gaseous media. Due to the problem of dew point corrosion, the recovery of this part of low-temperature waste heat currently exists. Great technical problems; such as 110-150 ℃ furnace, kiln vent flue gas, 150 ℃ gas and other process gases, 50-90 ℃ condensing steam turbine generator exhaust steam, 100 ℃ low-temperature hot water, etc. ; This part of the low temperature margin accounts for about 8-15% of the total energy consumption. At present, most of this part of heat is...

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Problems solved by technology

[0002] In the field of industrial production, the heat of the medium below 150°C is called low-temperature waste heat. In various industrial production fields, there is a large amount of low-temperature waste heat, most of which are gaseous media. Due to the problem of dew point corrosion, the recovery of this part of low-temperature waste heat currently exists. Great technical problems; such as 110-150 ℃ furnace, kiln vent flue gas, 150 ℃ gas and other process gases, 50-90 ℃ condensing steam turbine generator exhaust steam, 100 ℃ low-temperature hot water, etc. ; This part of the low temperature margin accounts for about 8-15% of the total energy consumption. At present, most of this part of heat is discharged into the atmosphere, causing a great waste of energy; part of this part of heat is directly discharged into the atmosphere, such as 110 Furnaces and kilns at -150°C vent flue gas; some of them need to use air cooling or cooling water to lower the temperature of the medium to the required temperature, such as process gases such as gas below 150°C, and condensing steam turbines at 50-90°C Generator exhaust steam, etc., the air cooling method directly transfers the heat of the medium to the air and discharges it into the atmosphere, and at the same time consumes a large amount of power and electricity. The cooling water cooling method requires a large amount of cooling water, and then uses air Cooling reduces the temperature of the cooling water and indirectly transfers heat to the atmosphere

[0003] At present, in the background art, there are very few low-temperature waste heat recovered by heat pump technology, but the recovered heat is of low grade, which can only be used for heating and meeting the demand for lower-temperature heat, and the grade of heat recovery cannot be improved, and the recovered heat cannot be used A large number of them are returned to the industrial production field to continue to use, and the recovery efficiency of low-temperature heat cannot be improved. At the same time, the investment is large and the cost of heat recovery is also high

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