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Device and method for preparing marine urea solution

A urea solution technology, applied in the field of marine urea solution preparation equipment, can solve the problems of volume increase, system cost increase, solution theoretical concentration and actual concentration, etc., to improve accuracy and eliminate preparation errors.

Active Publication Date: 2018-02-16
SUNRUI MARINE ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Storage time, ambient humidity, and temperature will all cause differences in the moisture absorption of urea powder, making it impossible to directly weigh the net weight of urea powder to prepare a solution
On the other hand, in the process of conveying and pouring urea powder, it is inevitable that some urea powder will remain in the conveying device or packaging. This cumulative error will also make the theoretical concentration of the solution inconsistent with the actual concentration.
In addition, in order to prevent the SCR catalyst carrier from being poisoned by metal ions and thus lose its catalytic effect, the urea solution must use first-grade ultrapure water (resistivity ≥ 18MΩ·cm), which requires special pure water manufacturing equipment to produce, resulting in increased system costs, increase in size

Method used

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  • Device and method for preparing marine urea solution
  • Device and method for preparing marine urea solution
  • Device and method for preparing marine urea solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A ship's SCR system needs to prepare a standard concentration of urea solution of about 4m 3 , the urea powder package packaging specification is 0.08t / bag, you need to use 23 powder packages, a total of 1.840t. Start the urea solution preparation device, and the powder pack conveyor will transport 23 packs of urea powder packs to the automatic unpacker for unpacking in turn; when the urea powder enters the dissolving mixer, inject 2m 3 Pure water, while turning on the stirrer to dissolve and stir, after stabilization, the concentration of the solution at 20 degrees Celsius is 47.0%; according to the calculation, inject 0.66m again 3 Pure water, the final urea solution concentration is 40.6%, which meets the requirements. The cost of the ship's automatic urea solution preparation device is 100,000 yuan, and the urea powder consumption of the SCR system is 550 yuan / h; compared with the cost of 1,000 yuan / h of urea solution, the denitration system can recover the device ...

Embodiment 2

[0073] A ship's SCR system needs to prepare a standard concentration of urea solution of about 6m 3 , urea powder package specification is 0.1t / bag, 28 powder packages need to be used, a total of 2.800t. Start the urea solution preparation device, and the powder package conveyor transports 28 urea powder packages to the automatic unpacker for unpacking in turn; when the urea powder enters the dissolving mixer, inject 3m 3 kg pure water, and at the same time, turn on the stirrer to dissolve and stir. After stabilization, the concentration of the solution at 25 degrees Celsius is 44.3%; according to the calculation, inject 0.579m again. 3 Pure water, the final urea solution concentration is 39.5%, which meets the requirements. The cost of the ship's automatic urea solution preparation device is 250,000 yuan, and the consumption of urea powder in the SCR system is 1,133 yuan / h; compared with the 2,060 yuan / h cost of urea solution, the denitration system can recover the device co...

Embodiment 3

[0075] A ship's SCR system needs to prepare a standard concentration of urea solution of about 5.5m 3 , the urea powder package packaging specification is 0.2t / bag, you need to use 13 powder packages, a total of 2.6t. Start the urea solution preparation device, and the powder pack conveyor will transport 13 packs of urea powder packs to the automatic unpacker for unpacking in turn; when the urea powder enters the dissolving mixer, inject 2.4m 3 At the same time, turn on the stirrer to dissolve and stir, and the concentration of the solution at 20 degrees Celsius after stabilization is 50.9%; according to the calculation, inject 1.33m again 3 Pure water, the concentration of urea solution at 20 degrees Celsius after stabilization is 41.1%; according to the calculation, the third injection of pure water is 0.174m 3 pure water. After stabilization, the concentration of urea solution at 20 degrees Celsius is 40.1%, which meets the requirements. The cost of the ship's automatic ...

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Abstract

A marine urea solution preparation device, including a feeding system for providing and delivering urea powder; a dissolving agitator, the urea powder is put into the dissolving agitator through the feeding system from the feeding port of the dissolving agitator, and the dissolving agitator is equipped with Concentration sensor; water supply equipment, a water pump is arranged between the water supply equipment and the dissolving agitator; a urea solution storage tank, and a urea solution injection pump is arranged between the urea solution storage tank and the dissolving agitator; The detector is connected with the concentration sensor, and the judging device judges whether to continue injecting water according to the signal of the concentration sensor, and the control system controls the water pump to inject a set amount of pure water into the dissolving agitator according to the signal of the judging device. The invention also provides a preparation method of the marine urea solution. The invention prepares the urea solution by injecting water in stages, which can effectively solve the influence of urea powder moisture absorption and leakage on the preparation of the urea solution, and improve the precision of preparing the urea solution.

Description

technical field [0001] The invention relates to the field of marine equipment, in particular to a device and method for preparing a marine urea solution. Background technique [0002] To control NO of marine diesel engine x Emissions, IMO has passed the amendment to the "MARPOL 73 / 78 Convention" Annex VI "Rules for the Prevention of Air Pollution from Ships", which stipulates three levels of Tier I to Tier III marine diesel engines NO. x Emission standards, of which the most stringent Tier III emission standards will be implemented in the Emission Control Area (ECA) from January 1, 2016. [0003] Selective Catalytic Reduction (SCR) is a high-efficiency diesel exhaust after-treatment technology that can meet Tier III emission standards. x At 290℃~420℃, it reacts with the reducing agent on the surface of the catalyst to generate non-toxic and non-polluting N 2 and H 2 O. When applied in the field of ships, the reducing agent is mostly urea solution or ammonia solution. B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/56
Inventor 高健范昊张文涛于航刘光洲
Owner SUNRUI MARINE ENVIRONMENT ENG
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