A method and device suitable for controlling nitrogen oxides in high-power diesel engines
A high-power diesel engine, nitrogen oxide technology, applied in exhaust devices, mufflers, mechanical equipment, etc., can solve the problems of long response time, feedback lag, increased injection error, etc., to improve the response speed and control accuracy. Effect
Active Publication Date: 2020-07-03
BEIJING UNIV OF TECH
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Problems solved by technology
If a single-stage SCR system composed of a catalytic box is used for processing, when the exhaust gas displacement is relatively large, the corresponding catalytic box will have a large volume, which will cause problems of long response time and feedback lag; the injection accuracy of the urea nozzle is also limited. , when the injection range is large, the corresponding injection error will also increase
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[0038]A device suitable for controlling nitrogen oxides of high-power diesel engines, the high-power is above 1000 kilowatts; it is characterized in that it includes a first-stage SCR system and a second-stage SCR system; the first-stage SCR system is installed in the exhaust The first temperature sensor (1) at the inlet of the gas pipeline, the upstream nitrogen and oxygen sensor (2), the first nozzle (3) and the first differential pressure sensor (4), the first urea pump (5), the first Pressure pipeline, the first catalytic box (10) is formed, and wherein, what the first differential pressure sensor measures is exactly the differential pressure of the first pressure-taking pipeline, namely the variable-section differential pressure between the inlet pipeline and the first catalytic box; The second-stage SCR system is composed of the second temperature sensor (11), the midstream nitrogen and oxygen sensor (12), the second nozzle (13) and the second differential pressure sensor...
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The invention provides a method and a device suitable for controlling nitrogen oxide of high-power diesel, and belongs to the technical field of diesels. The device is composed of a first stage SCR system and a second SCR system, and the device is suitable for a steady state working condition and a dynamic working condition of the diesel as well. The working condition that the diesel is in is judged through the change rate of the concentration of the nitrogen oxide at upstream of an entrance, when the diesel is in the steady state working condition, only a downstream nitrogen oxygen sensor ofthe first stage SCR system and the second SCR system of the device work which is equivalent to a closed-loop control, carbamide injection amount is adjusted according to information fed back by a downstream nitrogen oxygen sensor at an exit, so that the final exhaust nitrogen oxide content levels off to a target value; and when the diesel is detected to be in the dynamic working condition, two stages of the SCR system both work, wherein the first stage is open-loop control, exhaust firstly passes the first SCR system, more than 95% of nitrogen oxide is removed, the second stage is closed-loopcontrol, the carbamide injection amount is adjusted slightly through feedback regulation, and the response speed and control precision of carbamide injection are improved.
Description
technical field [0001] The invention relates to a method for treating nitrogen oxides in a high-power diesel engine post-treatment system under steady-state and dynamic working conditions, and proposes a two-stage SCR (selective catalytic reduction) post-treatment system to solve the problem of slow response and precision control of the traditional post-treatment process Poor problems belong to high-power diesel engine nitrogen oxides (NO X ) deals with technical fields. Background technique [0002] SCR is a method widely used in the treatment of nitrogen oxides, such as the denitration treatment of flue gas in power plants and steel plant boilers, and the treatment of nitrogen oxides in the exhaust gas of diesel engines. Among them, the operating conditions of boilers in power plants and steel mills are relatively stable, and the flow rate and nitrogen oxide content of the flue gas released by them are very stable. Generally, a large denitrification tower will be built to...
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IPC IPC(8): F01N3/20
CPCF01N3/2066F01N3/208F01N2570/14F01N2610/02F01N2610/14F01N2610/148Y02T10/12
Inventor 雷艳李泳仇滔陈新宇刘显武岳广照
Owner BEIJING UNIV OF TECH