A tail gas condensed water circulation device
A technology of water circulation and tail gas, applied in the field of pulp and paper making, can solve the problems of heat waste, reduce the ability of paper to evaporate water, and achieve the effect of improving evaporation rate, maximizing energy utilization, and reducing water.
Active Publication Date: 2019-10-11
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology
[0003] The stagnation of hot and humid air generated in the closed air hood of the drying section of the paper machine will reduce the ability of the paper to evaporate and take away moisture, resulting in a downward trend in the drying rate due to the reduction of the evaporation rate, while directly discharging it to the outside will cause damp heat The large amount of heat contained in the air causes waste
Method used
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Embodiment Construction
[0017] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0018] Such as figure 1 Shown: The hot and humid steam and the secondary steam generated by the central circulation evaporator heat the dry cold air in the heat exchanger under the action of the adjustable heat pump. The dry hot steam generated by the heat exchanger is sent to the closed air hood of the paper machine, and the high-temperature condensed water generated is sent to the central circulation evaporator for recycling. The high-temperature condensed water in the central circulation evaporator is evaporated into secondary steam through the heating of the evaporation chamber, and the remaining condensed water is discharged from the central circulation evaporator into the flash tank for vapor-liquid separation, and the steam pressure is increased through the steam compressor and temperature, and used to heat the high-temperature condensed water from the heat e...
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The invention discloses a tailgas condensed water circulating device. The tailgas condensed water circulating device comprises a heat exchanger, a wet hot steam inlet and a dry cold air inlet are respectively arranged at the upper end of the heat exchanger, and a dry hot air outlet and a wet hot steam outlet are respectively arranged at the lower end of the heat exchanger; the wet hot steam inlet is connected with an air outlet of a gas hood through an adjustable heat pump, and the wet hot steam outlet at the bottom part of the heat exchanger is connected on a heating chamber of a central circulating evaporator through a circulating water pump I; one path of the gas entering the heating chamber enters an evaporating chamber, and the other path of the gas enters a steam compressor through a flash tank connected with the lower part of the central circulating evaporator; a gas outlet of the steam compressor is circularly connected on the heating chamber; the central circulating evaporator is sequentially provided with a shower nozzle, the evaporating chamber and the heating chamber from top to bottom; condensed water produced at the bottom part of the central circulating evaporator is connected on the evaporating chamber through a circulating water pump III; and the top part of the central circulating evaporator is connected with the adjustable heat pump through a pipeline. The tailgas condensed water circulating device has the characteristics of simple structure and high efficiency.
Description
technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a tail gas condensed water circulation device. Background technique [0002] my country's pulp and paper industry is becoming larger and more modernized, but behind the high output is high emissions and high energy consumption, which has become the focus of people's increasing attention. For the sustainable development of the paper industry, energy saving and emission reduction are particularly important. [0003] The stagnation of hot and humid air generated in the closed air hood of the drying section of the paper machine will reduce the ability of the paper to evaporate and take away moisture, resulting in a downward trend in the drying rate due to the reduction of the evaporation rate, while directly discharging it to the outside will cause damp heat The large amount of heat contained in the air causes waste. Contents of the invention [0004] In order to ...
Claims
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IPC IPC(8): D21F5/20
Inventor 李明辉刘滨朝
Owner SHAANXI UNIV OF SCI & TECH