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Ship exhaust gas denitration urea automatic adding method and device thereof

A technology of automatic addition and exhaust gas, applied in exhaust devices, mufflers, exhaust gas treatment, etc., can solve the problems of low control accuracy, strict emission limit, and large amount of urea.

Pending Publication Date: 2017-12-08
SUNRUI MARINE ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other existing exhaust gas denitrification methods have disadvantages such as large amount of urea consumption, easy to cause secondary pollution, low and unstable control accuracy, etc.
Most of the existing technologies calculate the amount of urea solution added under stable working conditions, and it is difficult to accurately control the emission of nitrogen oxides in exhaust gas, and the secondary pollution caused by ammonia escape is not considered
Due to the large changes in the exhaust gas mass flow rate, temperature, and nitrogen oxide concentration of the diesel engine under different loads, and the Tier III emission standard has strict restrictions on the emission of nitrogen oxides in the exhaust gas, if excessive urea solution is added, the nitrogen oxides at the SCR outlet will The concentration of oxides will meet the Tier III emission standard, but at the same time, it will also lead to an excessively high ammonia concentration at the SCR outlet, resulting in ammonia escape and secondary pollution; if the amount of urea solution added is insufficient, the nitrogen oxide emission cannot meet the Tier III standard. This requires the ship exhaust gas denitrification treatment device to have high denitrification efficiency, stability and control accuracy

Method used

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  • Ship exhaust gas denitration urea automatic adding method and device thereof
  • Ship exhaust gas denitration urea automatic adding method and device thereof
  • Ship exhaust gas denitration urea automatic adding method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: choose diesel engine to carry out test, its power is 8800KW, and rotating speed is 100rpm, the waste gas parameter when monitoring several power points in the test, as shown in table 1, table 2:

[0034] Table 1 Exhaust gas monitoring parameters at SCR inlet in the test

[0035]

[0036] Table 2 Exhaust gas monitoring parameters at SCR outlet in the test

[0037]

[0038] Among them, the tier III emission standard requires that when the speed n<130rpm, the NOx emission limit is 3.4 g / kWh; the ammonia slip design limit is 10ppm. It can be seen from the test data that the control method and device for automatically adding urea solution for ship exhaust gas denitrification in the present invention meet the tier III emission standard; it can also effectively control the ammonia escape concentration at the SCR outlet.

Embodiment 2

[0039] Example 2: A diesel engine was selected for the test, its power was 2060KW, and its rotational speed was 525rpm. During the test, the exhaust gas parameters at several power points were monitored, as shown in Table 3 and Table 4.

[0040] Table 3 Exhaust gas monitoring parameters at SCR inlet in the test

[0041]

[0042] Table 4 Exhaust gas monitoring parameters at SCR outlet in the test

[0043]

[0044] Among them, the tier III emission standard requires that when the speed is 130rpm -0.2 g / kWh, when n=525, it is 2.57g / kWh; the ammonia escape design limit is 10ppm. It can be seen from the test data that the control method and device for automatically adding urea solution for ship exhaust gas denitrification in the present invention meet the tier III emission standard; it can also effectively control the ammonia escape concentration at the SCR outlet.

[0045] In the present embodiment, the catalytic reduction reaction formula in the reactor is:

[0046] ...

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Abstract

The invention relates to a ship exhaust gas denitration urea automatic adding method and a device thereof. The ship exhaust gas denitration urea automatic adding device comprises a reactor (10), an SCR inlet exhaust gas flow meter (15) to which a controller (1) has access, a mixer (7), an electric heater (8), an SCR inlet nitrogen oxide analysis meter (13) and an SCR inlet temperature sensor (14) are arranged at an exhaust gas inlet pipeline of the reactor (10), compressed air (5) communicates with a spray gun (6) installed in the exhaust gas inlet pipeline through a compressed air pipeline, and the spray gun (6) is located in the mixer (7). The ship exhaust gas denitration urea automatic adding method and the ship exhaust gas denitration urea automatic adding device have the advantages that real-time changes of working conditions such as the exhaust gas temperature, the exhaust gas mass flow rate and the nitrogen oxide concentration of a marine diesel engine under different load conditions are taken into consideration, and effective control over secondary pollution caused by ammonia escape is realized.

Description

technical field [0001] The invention relates to a method and a device for automatically adding urea for ship waste gas denitrification, belonging to the field of ships. Background technique [0002] With the development of the shipbuilding industry, ship exhaust gas has gradually become one of the main sources of global air pollution. As the governments of various countries have increasingly strict emission control on land vehicles and thermal power plants, in order to further control the pollution of ship exhaust pollutants to the atmosphere, the International Maritime Organization ( IMO ) promulgated and implemented the "Rules for the Prevention of Air Pollution Caused by Ships" ( Annex VI of the MARPOL 73 / 78 Convention), Article 13 of the rules stipulates that ships constructed on or after January 1, 2016, sailing in the ECA (Emission Control Area), require nitrogen oxide (NOX) emissions to meet Tier III emission standards, And the NOx emission limit required by the Tier...

Claims

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Application Information

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IPC IPC(8): F01N3/20
CPCF01N3/2066F01N3/208F01N2610/02F01N2570/14Y02T10/12
Inventor 王伟刘雪雷王洪仁
Owner SUNRUI MARINE ENVIRONMENT ENG
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