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Unqualified fresh steam condensate water waste heat utilization and secondary recovery method

A technology for secondary recovery and condensed water, applied in steam/steam condensers, heat exchangers, heat exchanger types, etc., can solve problems such as waste and heat loss, reduce steam volume, avoid losses and waste, and save energy cost effect

Inactive Publication Date: 2021-02-09
靖西天桂铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this stage, when the indicators are unqualified, the condensed water is directly used as bad water to wash the red mud in the hot water tank under normal pressure. After the hot water tank, a large amount of heat is lost by evaporation, and the dissolved water is the desalinated water after chemical water treatment, which is used to wash the red mud and causes a lot of waste

Method used

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  • Unqualified fresh steam condensate water waste heat utilization and secondary recovery method
  • Unqualified fresh steam condensate water waste heat utilization and secondary recovery method
  • Unqualified fresh steam condensate water waste heat utilization and secondary recovery method

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Embodiment

[0013] In this embodiment, the production capacity of 800,000 tons of alumina in a certain factory is taken as an example.

[0014] The decomposed mother liquid is heated through the shell and tube heat exchanger to form the evaporated raw liquid, and the average amount of decomposed cold mother liquid is 1040m 3 / h, the temperature of the evaporating stock solution is 84°C; the temperature of the whole stock solution can be increased to 90.7°C after stripping out unqualified new steam condensed water to heat up the temperature (see Table 1)

[0015]

[0016] According to the calculation of evaporation heat balance, when the temperature of the evaporation stock solution is 90.7°C, the new steam consumption is 6.8t / h less than that of the stock solution temperature of 84°C (see Table 2).

[0017]

[0018] At the same time, chemical water treatment mainly removes calcium, magnesium plasma and suspended solids in raw water, and unqualified dissolution of new steam condenses...

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Abstract

The invention discloses an unqualified fresh steam condensate water waste heat utilization and secondary recovery method. The method comprises the following process steps of 1) conveying unqualified fresh steam condensate water to a tubular heat exchanger with a heat exchange area of 350m <2> at a flow rate of 98.4t / h, taking another heat exchange substance in the heat exchanger as a decompositionmother liquor, and ensuring that the flow rate of the decomposition mother liquor is 300m<3> / h; 2) conveying the fresh steam condensate water to a chemical water treatment mixed bed device after heatexchange, and returning the decomposition mother liquor to a decomposition mother liquor tank after heat exchange. The waste heat of the fresh steam condensate water can be effectively utilized and recycled, loss and waste are avoided, and the production cost is saved.

Description

technical field [0001] The invention relates to the technical field of alumina production, in particular to a method for utilizing waste heat of unqualified new steam condensed water and secondary recovery. Background technique [0002] When the alumina dissolution unit is shut down for maintenance, the dissolution unit needs to replace the new steam heating sleeve to clean the sleeve scar outside the line. It has been observed that after each cleaning is completed and production is resumed, the condensation of the heating sleeve after the new steam heat exchange Water Si0 2 >100μg / l, which cannot meet the boiler water requirements. The indicators of the dissolution unit improved after continuous operation for more than 17 days, Si0 2 After <100μg / l, the boiler is gradually used to recover part of the dissolved backwater. At this stage, when the indicators are unqualified, the condensed water is directly used as bad water to wash the red mud in the hot water tank un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28B9/08F28D21/00
CPCF28B9/08F28D21/0012
Inventor 赵志勇
Owner 靖西天桂铝业有限公司
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