A method for heat preservation of urea, NaOH, and Mg(OH)2 storage tanks

By using the condensate from the air conditioning unit and the drain water from the cleaning bilge water tank to cool or heat the urea NaOH and Mg(OH)2 storage tanks, the problem of increased costs in existing technologies is solved, and energy saving and consumption reduction are achieved.

CN121158128BActive Publication Date: 2026-07-24DALIAN SHIPBUILDING INDUSTRY CO LTD
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Patent Information

Application Number
CN202511403723.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-29
Publication Date
2026-07-24
Estimated Expiration
2045-09-29

AI Technical Summary

Technical Problem

Existing technologies for heating or cooling urea (NaOH) and Mg(OH)2 storage tanks on ships increase ship construction and operating costs and waste the heat of condensate and fresh water.

Method used

The condensate from the air conditioning unit and the drain water from the cleaning bilge tank are used to cool or heat the urea NaOH and Mg(OH)2 storage tanks. The solution temperature is regulated by connecting pipelines and controlling valves, combined with temperature sensors and level switches.

Benefits of technology

It saves on the capacity and power of seawater pumps, freshwater pumps, and intercooler plate coolers, reducing construction costs, and maximizes the cooling capacity of condensate, ensuring the solution temperature is between 10 and 35°C, which aligns with the trend of green shipbuilding.

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Abstract

A method for heat preservation of urea NaOH and Mg(OH)2 storage cabin, aiming at the ship equipped with SCR system, EGR system, iCER system and desulfurization system, and the ship needs to store urea, NaOH or Mg(OH)2. The condensate water of air conditioning unit is collected and introduced into the storage cabin by gravity, and the condensate water production and condensate water temperature of air conditioning unit are analyzed and calculated. Under the premise that the cabin capacity meets the conditions, the condensate water is used for cooling the urea cabin, and then discharged into the clean bilge water tank, which maximizes the cooling capacity of the condensate water. In winter or cold weather, when the air conditioning unit does not need to run, in order to avoid the temperature of the solution cabin being too low, the discharge water in the clean bilge water tank can be used to heat the storage cabin before discharging, which ensures that the storage temperature of urea, NaOH or Mg(OH)2 solution is 10~35℃.
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