A marine low-temperature self-cleaning urea tank

Abstract

The invention discloses a marine low-temperature self-cleaning urea tank, which comprises a storage tank, a circulating water pipe, an expansion tank, a dosing device, a cooling water pump, a heat exchanger, a cooling component and a cleaning component, and the circulating water tube is passed through the storage tank , the expansion tank is arranged outside the storage cabin, the expansion tank communicates with the storage cabin through a circulating water pipe, the dosing device is arranged outside the expansion tank, and one end of the dosing device communicates with the storage cabin through a circulating water pipe , the cooling water pump is arranged outside the dosing device, the storage compartment and the expansion tank communicate with one end of the cooling water pump through a circulating water pipe, the other end of the cooling water pump communicates with the dosing device, and the heat exchanger is arranged at The outside of the cooling water pump, one end of the heat exchanger communicates with the storage compartment through a circulating water pipe, and the other end of the heat exchanger communicates with the dosing device. The urea tank provided by the invention is easy to maintain, has low temperature and good constant temperature effect.

Description

technical field [0001] The invention relates to the field of ship power systems, in particular to a low-temperature self-cleaning urea tank for ships. Background technique [0002] According to the requirements of relevant meetings of the International Maritime Organization Marine Environmental Protection Committee, ships entering the NOx emission control area need to meet Tier III NOx emission standards. To meet this emission standard, SCR, EGR and low-pressure injection LNG engine technologies are generally used, among which SCR technology is applied most widely. The SCR reactor needs ammonia as the reaction medium in the catalytic reduction reaction, and marine urea is a reliable raw material for ammonia production. The storage of urea solution has strict requirements on the ambient temperature. When the temperature exceeds 35°C, the shelf life of the urea solution will drop rapidly or even expire. Failure to occur is a waste of money for the shipowner. The set tempera...

AI Technical Summary

Problems solved by technology

The storage of urea solution has strict requirements on the ambient temperature. When the temperature exceeds 35°C, the shelf life of the urea solution will drop rapidly or even expire. A failure is a waste of money for the shipowner

The set temperature of the central cooling fresh water on the ship is generally 36°C, which cannot cool the urea solution, and the seawater temperature in tropical working conditions also reaches 32°C, which is not suitable for cooling urea. In this regard, Chinese patent: CN102935337B passed the urea dry powder and Accurate metering of deionized water realizes fully automatic online preparation of urea solution, but the excess urea solution produced still lacks a good storage environment, and there is still the phenomenon of waste of urea solution. For this reason, a special urea tank must be designed To extend the storage time of urea solution, the purpose of this urea tank is to keep the low temperature in the storage tank, prolong the storage time of urea solution, and reduce the maintenance cost of the shipowner

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