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Method for purifying tail gas of diesel engine through plasmas

A technology of plasma and plasma source, applied in the field of plasma purification of diesel engine exhaust

Inactive Publication Date: 2014-05-07
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention only adopts the purification method of injecting plasma into the exhaust pipe of diesel engine, and solves the problems of NOx and SO in the exhaust of diesel engine at the same time. 2 , CO, HC and carbon particles five pollutants

Method used

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  • Method for purifying tail gas of diesel engine through plasmas
  • Method for purifying tail gas of diesel engine through plasmas
  • Method for purifying tail gas of diesel engine through plasmas

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Embodiment Construction

[0043] The present invention adopts a narrow-gap dielectric barrier strong ionization discharge method to construct the plasma source 7, and the high-frequency high-voltage power supply 8 provides high-frequency high-voltage to the plasma source, and a strong electric field with a reduced electric field strength of 300Td to 500Td is formed in the discharge gap in the plasma source. ionization electric field, O 2 After being dissociated by a strong ionizing discharge electric field, a plasma with a concentration of 80mg / L to 400mg / L is formed after ionization (O 2 + , O 2 － , O 2 (a 1 Δ g ), O 3 Wait). General embodiment of the present invention is as figure 1 shown. First inject the plasma 6 into the exhaust pipe 5 of the diesel engine 3, and the plasma 6 will oxidize the soot particles into CO 2 and H 2 O; at the same time in the exhaust pipe 5 to contain NOx, SO 2 , HC and carbon particles in diesel engine exhaust 4 are oxidized to NO 2 , O 3 Oxidize CO to CO ...

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Abstract

The invention discloses a method for purifying tail gas of a diesel engine through plasmas, belongs to the technical field of environmental science and engineering science and relates to a method for purifying the tail gas of the diesel engine through plasmas. The method is characterized in that oxygen plasmas O2<+>, O<+>,O2<->, O<->, O, O2<-> (a1[detal]g) and O3 are injected into a tail gas discharging pipeline of the diesel engine; O2<+> reacts with water in the tail gas to generate hydroxyl radical OH which reacts with NOx and SO2 in the tail gas to generate nitric acid and sulfuric acid mist; under the action of a static electric field, a resource substance nitric acid solution is formed; or Ca(OH)2 is used for harmless disposal of nitric acid to generate Ca(NO3)2; meanwhile, CO, HC and carbon particles in the tail gas are eliminated; the efficiency of removal of the pollutants in the tail gas of the diesel engine by the plasmas is 85-99.8 percent.

Description

technical field [0001] The invention belongs to the field of environmental science and engineering technology, and relates to a method for purifying diesel engine tail gas by plasma. Background technique [0002] Pollutants emitted by diesel engine exhaust have endangered the environment on which people live. The two most difficult pollutants in diesel engine exhaust are gaseous pollutants NOx, HC, CO, and SO 2 etc.; the second is solid soot particles (PM). At present, the selective catalytic reduction (SCR) method can only be used to purify NOx in diesel engine exhaust, and NH is usually used 3 As a reducing agent, NOx is decomposed by NH under the action of catalysts such as noble metals, alkali metal oxides or zeolites 3 reduced to N 2 、H 2 O, the suitable temperature for the reaction is 285°C to 400°C. NOx in diesel engine exhaust passes through the oxidation catalytic converter, SCR catalytic converter, escape oxidation catalytic converter, liquid NH 3 and its gas...

Claims

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Application Information

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IPC IPC(8): B01D53/92
Inventor 白敏菂
Owner DALIAN MARITIME UNIVERSITY
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