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On-line spray descaling method and system for diesel engine exhaust gas recirculation cooler

A technology for exhaust gas recirculation and diesel engine, applied in exhaust gas recirculation, engine components, combustion engines, etc., can solve the problems of pollution, effective conversion of unfavorable carbon deposits, and severe temperature changes, and achieve the effect of ensuring performance stability.

Active Publication Date: 2011-12-14
ZHEJIANG YINLUN MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to avoid the pollution of methanol or ethanol aqueous solution to the air, this scheme needs to strictly control the injection dose; and the wall temperature of the exhaust gas recirculation heat exchanger changes sharply and no catalyst is coated, which is not conducive to the effective conversion of carbon deposits
It can be seen that the existing exhaust gas recirculation cooler carbon deposit removal technology needs to be further improved to meet the increasingly stringent requirements of emission regulations

Method used

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  • On-line spray descaling method and system for diesel engine exhaust gas recirculation cooler
  • On-line spray descaling method and system for diesel engine exhaust gas recirculation cooler
  • On-line spray descaling method and system for diesel engine exhaust gas recirculation cooler

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Embodiment Construction

[0021] The principle of the inventive method is as follows:

[0022] The average molecular formula of diesel is C 15 h 28 , the chemical reaction equation for complete combustion is:

[0023] C 15 h 28 +22O 2 →15CO 2 +14H 2 o

[0024]Water accounts for a large proportion of the reaction product, that is, the moisture content of the diesel engine combustion exhaust gas is significantly higher than that of the intake air. When the combustion excess air coefficient is 2, the increment is about 41g / kg dry air. On this basis, through the spraying method, the latent heat of vaporization of water is used to absorb the heat of exhaust gas, which can greatly reduce the temperature of exhaust gas, and further increase its moisture content to make it saturated. Take the following working conditions as an example: the intake air temperature of the exhaust gas recirculation cooler is 500°C, the gauge pressure is 250kPa, and the moisture content of the intake air is 20g / kg dry air;...

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Abstract

The invention discloses an on-line spraying method and an on-line spraying system for an exhaust gas recirculation cooler of a diesel engine. In the method, according to the actual operation condition of the diesel engine and the exhaust gas recirculation cooler, an on-line spraying descaling system is controlled by an electronic control unit (ECU), and atomized descaling liquid is sprayed to an inlet on the hot side of the exhaust gas recirculation cooler, so that recycling exhaust gas with high moisture content is in the saturated state; and water vapor is condensed and collected on the hotside wall surface of the cooler and outflows, so that the on-line cleaning of the hot side wall surface of the exhaust gas recirculation cooler is realized, the problems of low performance and corrosion in the long-term using process of the exhaust gas recirculation cooler are solved, and the maintenance of the exhaust gas recirculation system is simplified.

Description

technical field [0001] The invention relates to a heat exchanger descaling method and system, in particular to the technical field of engine exhaust aftertreatment, in particular to an online descaling method and system for a diesel engine exhaust gas recirculation cooler. Background technique [0002] Nitrogen oxides are one of the main pollutants emitted by diesel engines. By mixing part of the exhaust gas with the intake air, the exhaust gas recirculation system can effectively reduce the combustion temperature and excess air ratio in the cylinder, thereby suppressing the nitrogen oxide content in the exhaust gas. An exhaust gas recirculation cooler is usually installed in the recirculation exhaust gas circuit to improve the effect of the system on suppressing emissions; the exhaust gas side is called the hot side, and the cooling medium side is called the cold side. For the exhaust gas turbocharged diesel engine, according to the position of the recirculated exhaust gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/07F02B77/04F02M26/29F02M26/50
CPCY02T10/121Y02T10/12
Inventor 覃峰郭丽华张文锋
Owner ZHEJIANG YINLUN MACHINERY
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