JPH02119918U

JPH02119918U -

Info

Publication number: JPH02119918U
Application number: JP2824689U
Authority: JP
Priority date: 1989-03-13
Filing date: 1989-03-13
Publication date: 1990-09-27

Description

[Brief explanation of drawings]

第１図はこの考案の実施例を示す構成図、第２
図は同じく圧力制御機構の断面図、第３図Ａ，Ｂ
はエンジンのＮＯｘ発生量と排気ガス中のＮＯｘ
濃度特性図、第４図は同じく排圧特性図、第５図
は従来技術を示す構成図である。２１……エンジン排気通路、２２……触媒コン
バータ、２４……アンモニアガス供給通路、３０
……圧力制御機構、３２……調圧室、３３……背
圧室、３４……ダイヤフラム、３５……バルブ、
３７……排気導入通路。 Figure 1 is a configuration diagram showing an embodiment of this invention, Figure 2
The figure is also a sectional view of the pressure control mechanism, Figures 3A and B
is the amount of NOx generated by the engine and NOx in the exhaust gas.
A concentration characteristic diagram, FIG. 4 is also an exhaust pressure characteristic diagram, and FIG. 5 is a configuration diagram showing a conventional technique. 21...Engine exhaust passage, 22...Catalytic converter, 24...Ammonia gas supply passage, 30
... Pressure control mechanism, 32 ... Pressure regulation chamber, 33 ... Back pressure chamber, 34 ... Diaphragm, 35 ... Valve,
37...Exhaust introduction passage.

Claims

[Scope of utility model registration request]

In a diesel engine exhaust purification system that supplies ammonia gas into the engine exhaust passage and reduces NOx in the exhaust gas on a catalyst, the amount of ammonia gas supplied is determined by the amount of N in the exhaust gas.
As a means for controlling according to the Ox concentration, a pressure control mechanism is installed in the ammonia gas supply passage to control the supply pressure of the ammonia gas via a diaphragm that responds to the exhaust pressure from the exhaust passage upstream of the catalyst. Diesel engine exhaust purification device.