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A scr system for small and medium ships

A SCR system, small and medium-sized technology, applied in the direction of electronic control of exhaust treatment devices, machines/engines, mechanical equipment, etc., can solve the problems of untimely response and large injection volume error, and achieve rapid response, fast response, The effect of flexible control methods

Active Publication Date: 2018-09-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the defects of untimely control system response and relatively large injection quantity error in the existing SCR system of small and medium-sized ships, and provides an SCR system for small and medium-sized ships that can control accurately and respond quickly

Method used

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  • A scr system for small and medium ships
  • A scr system for small and medium ships
  • A scr system for small and medium ships

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A small and medium-sized ship SCR system, such as figure 1 and figure 2 shown. In the front exhaust pipe 101 of the SCR reactor 102, a flow sensor 3 (range 1500~6500m 3 / h, design flow 2500-5000 m 3 / h), urea nozzle 5 and urea pyrolysis temperature sensor 6 (design temperature 250-450°C), the urea pyrolysis temperature sensor is installed near the outlet of the urea nozzle; it is installed within the range of 5-15cm from the inlet of the SCR reactor There are imported temperature sensor 7 (design temperature 250-450 ℃), imported nitrogen oxide sensor 8 (range 0-1500ppm, design concentration 500-1300ppm), front-end pressure sensor 9 and imported oxygen sensor 10.

[0035] The flow sensor is used to detect the real-time exhaust volume at the current temperature, the urea pyrolysis temperature sensor is used to detect the real-time flue gas temperature at the urea nozzle, the inlet temperature sensor is used to detect the flue gas temperature before entering the SCR rea...

Embodiment 2

[0045] For the situation where there is no engine speed signal, reference may be made to this embodiment. A small and medium-sized ship SCR system, such as image 3 and Figure 4 shown.

[0046] Two layers of catalysts are arranged in the SCR reactor, and pressure sensors, temperature sensors, nitrogen oxide sensors, and oxygen concentration sensors are respectively arranged in front of the catalyst, behind the catalyst, and between the two layers of catalysts. Inlet temperature sensor 7 (design temperature 250-450°C), inlet nitrogen oxide sensor 8 (range 0-1500ppm, design concentration 500-1300ppm), front-end pressure sensor 9 and inlet The oxygen sensor 10 is used to collect flue gas data at the reactor inlet in real time; an intermediate temperature sensor 11 (design temperature 250-450°C) and an intermediate nitrogen oxide sensor 12 ( Range 0-1500ppm) is used to detect the exhaust gas parameters between the two catalysts; at the outlet of the SCR reactor, there are outl...

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Abstract

The invention belongs to the technical field of pollution control on emission of nitrogen oxides of tail gas of diesel engines and particularly relates to a urea control system of an SCR (selective catalytic reduction) system for small and medium-sized ships. The SCR system for the small and medium-sized ships comprises an SCR reactor adopting two stages of catalyst modules and further comprises the urea control system, wherein the urea control system comprises a controller, a displayer and signal acquisition modules, all the signal acquisition modules are connected with the controller and the displayer respectively, and an execution module is connected with the controller. According to the SCR system, the urea injection amount is controlled by the aid of the controller, the urea flow is precisely controlled according to the urea amount calculated by the controller, and a urea aqueous solution stored in a urea box is sprayed into a main exhaust pipe of the SCR reactor by a urea nozzle.

Description

technical field [0001] The invention belongs to the technical field of diesel engine tail gas nitrogen oxide emission pollution control, and in particular relates to an SCR system for small and medium-sized ships. Background technique [0002] With the increasingly serious impact of exhaust emissions from ships on the atmospheric environment, more and more attention has been paid to reducing emissions from ships. Nitrogen oxides are the main pollutants emitted by ships. The International Maritime Organization (IMO) Marine Environment Protection Committee MPEC stipulates in Annex 6 of the "International Convention for the Prevention of Pollution from Ships MARPOL" that when ships sail in emission restricted areas, their nitrogen oxide emissions The quantity needs to meet the Tier III standard. [0003] Selective catalytic reduction (Selective catalytic reduction, SCR) is an engine exhaust after-treatment technology that can effectively remove nitrogen oxides in exhaust. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00F01N11/00F01N3/28
CPCF01N3/28F01N9/00F01N11/00Y02T10/40
Inventor 高翔竺新波郑成航王耀霖岑可法骆仲泱倪明江周劲松翁卫国吴卫红张涌新宋浩张玉嵩黄彧张峻溪
Owner ZHEJIANG UNIV