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Method and appts. for reducing discharge of nitrogen oxide in selective catalytic reduction system

A technology of equipment and reducing agent, which is applied in the direction of chemical instruments and methods, separation methods, mechanical equipment, etc., can solve the problems of solidified storage tank liner pumps, damage, unacceptable evaporative emissions, etc., and achieve the effect of eliminating the loss of reducing agent

Inactive Publication Date: 2002-12-04
HALDOR TOPSOE AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] and currently used to reduce NO x Some of the problems associated with SCR systems are corrosion of different components in the system, urea crystallization leading to deposits in the lines, maintaining constant valve settings and unacceptable evaporative emissions
Subzero temperatures also lead to solidification and subsequent destruction of tank liner pumps
There is currently no known system that can be safely operated in all different modes of operation

Method used

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  • Method and appts. for reducing discharge of nitrogen oxide in selective catalytic reduction system
  • Method and appts. for reducing discharge of nitrogen oxide in selective catalytic reduction system
  • Method and appts. for reducing discharge of nitrogen oxide in selective catalytic reduction system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Build and test a system as described above. The inner capsule A was filled with a 32.5 wt / wt% aqueous urea solution. Turn valves V1 and V2 to "open" position (running mode). Adjust the pressure regulator R1 to 2 bar (2×10 5 Pa). The carrier air entering the mixer F is adjusted to 1 bar (1×10 5 Pa). By actuating the dosing valve G, a constant urea flow into the exhaust gas E is established. Example 2

Embodiment 2

[0069] Fill inner capsule A with 25% ammonia water instead of urea solution. The pressure setting is identical to Example 1. A constant ammonia flow is established by actuating the dosing valve G.

Embodiment 3

[0071] As Example 1, but in this case coolant liquid from tank T is used instead of compressed air. The coolant is pumped out via pump C3. On the pressure reducing valve R1, adjust the flow pressure to 2 bar (2×10 5 Pa). Liquid flow is delivered to tank B through V2 in the "on" position. Compress the urea contained in inner capsule A to 2 bar (2×10 5 Pa) equivalent pressure. As in Example 1, the flow of urea into mixer F was established.

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PUM

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Abstract

The invention concerns a process and an apparatus for reducing the content of nitrogen oxides (NOx) in the exhaust gases of diesel engines or turbines for stationary or mobile applications / vehicles in an SCR system by providing a stored source of liquid reducing agent and feeding the stored reducing agent to the exhaust gases, said process comprising transferring the liquid reducing agent from the external storage tank to a membrane storage tank equipped with an inner bellow consisting of a non-permeable flexible membrane, and a hydraulic or pneumatic displacement fluid located outside the inner bellow, filling the flexible inner bellow with liquid reducing agent and transferring the liquid reducing agent from the flexible inner bellow to the exhaust gases. <IMAGE>

Description

technical field [0001] The invention relates to a method for reducing nitrogen oxides (NOx) in the exhaust gas of fixed or mobile diesel engines or turbines x ) emissions, and more particularly to a method applicable to a selective catalytic reduction (SCR) system. [0002] Said SCR systems are a known and widely distributed technology used in heavy industry for the removal of nitrogen oxides in the exhaust gases of turbines, boilers, burners, power generation plants and other plants using fossil fuels. The system is based on the presence of NO in the exhaust x In the presence of the compound, a reducing atmosphere is established on the catalyst. [0003] The choice of reductant depends on the locally prevailing conditions in the different geographic regions where the SCR system will be used. Conditions such as price, regulations, and logistics play a role in the choice of reducing agent. The reducing agent usually used with diesel engine is pure ammonia or ammonia water (...

Claims

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Application Information

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IPC IPC(8): F01N3/08B01D53/94F01N3/00F01N3/20F04B9/08F04B43/10
CPCB01D53/9404F01N3/2066F01N2610/02F01N2610/03F01N2610/08F01N2610/14F01N2610/1406Y02A50/20Y02T10/12
Inventor S·-E·米克尔森P·L·T·加布里尔松
Owner HALDOR TOPSOE AS
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