Method of compacting ash deposited in a particulate filter by providing a low-temperature melting salt to said filter

Patent metadata

Field	Value
Publication number	US-2020032684-A1
Application number	US-201816477313-A
Country	US
Kind code	A1
Filing date	Jan 23, 2018
Priority date	Feb 3, 2017
Publication date	Jan 30, 2020
Grant date	—

Abstract

The present disclosure relates to a method of compacting an ash deposited in a particulate filter for a vehicle exhaust gas system, the method comprising the steps of: a) providing a low-temperature melting salt to the particulate filter, thereby forming a mixture of the ash and the low-temperature melting salt: and b) bringing the particulate filter to a compaction temperature, thereby compacting the mixture of the ash and the low-temperature melting salt. The disclosure further relates to engine oils, dosage products, engine systems and vehicles for implementing such a method.

First claim

1 . A method of compacting an ash deposited in a particulate filter for a vehicle exhaust gas system, the method comprising the steps of:
a) providing a low-temperature melting salt to the particulate filter, thereby forming a mixture of the ash and the low-temperature melting salt; and b) bringing the particulate filter to a compaction temperature, thereby compacting the mixture of the ash and the low-temperature melting salt.

2 . A method according to claim 1 , wherein the step a) of providing a low-temperature melting salt to the particulate filter is achieved by at least one of: dosing the low-temperature melting salt to an engine oil, dosing the low-temperature melting salt to a fuel, dosing the low-temperature melting salt to an intake air, and/or dosing the low-temperature melting salt to the vehicle exhaust gas system upstream of the particulate filter.

3 . A method according to claim 2 , wherein the low-temperature melting salt is dosed as a powder, a solid-in-solid dispersion, a solid-in-liquid dispersion or a molten salt.

4 . A method according to claim 1 , wherein the low-temperature melting salt has a melting point of from 100° C. to 1000° C.

5 . A method according to claim 1 , wherein the low-temperature melting salt comprises at least one cationic component and at least one anionic component, wherein the at least one cationic component is lithium (Li+), sodium (Na+), potassium (K+), rubidium (Rb+), caesium (Cs+), calcium (Ca2+) or ammonium (NH4+) ion, and the at least one anionic component is fluoride (F−), chloride (Cl−), bromide (Br−), iodide (I−), nitrate (NO3−), or sulphate (SO42−) ion.

6 . A method according to claim 1 , wherein the low-temperature melting salt is provided to the particulate filter in an amount of from 0.2 weight % to 20 weight %, relative to the dry weight of uncompacted ash deposited in the particulate filter.

7 . A method according to claim 1 , wherein the particulate filter is brought to a minimum compaction temperature of from 300° C. to 700° C.

8 . An engine oil comprising a base lubrication oil and a low-temperature melting salt for densifying an ash deposited in a particulate filter for a vehicle exhaust gas system.

9 . An engine oil according to claim 8 , wherein the base lubrication oil is a multi-grade synthetic oil.

10 . A low-temperature melting salt dosage product comprising a low-temperature melting salt dispersed in a solid matrix.

11 . A low-temperature melting salt dosage product according to claim 10 , wherein the solid matrix is a controlled-release matrix arranged to controllably release the low-temperature melting salt when submerged in an engine oil at temperatures of 50° C. and over.

12 . An engine system for a vehicle, the engine system comprising:
an internal combustion engine arranged to be operated by combustion of a fuel in intake air, arranged to be lubricated by means of an engine oil, and arranged to generate exhaust gases upon combustion of a fuel; a fuel supply system arranged to convey the fuel to the internal combustion engine; an air intake system arranged to convey intake air to the internal combustion engine; a lubrication system arranged to convey the engine oil to the internal combustion engine; an exhaust gas system arranged to convey the exhaust gases from the internal combustion engine, the exhaust gas system comprising a particulate filter for trapping ash and/or soot dispersed in the exhaust gases; and a salt dosing unit arranged to dose a low-temperature melting salt to the fuel and/or the engine oil and/or the intake air and/or the exhaust gas system upstream of the particulate filter.

13 . An engine system according to claim 12 , wherein the salt dosing unit is arranged to dose the low-temperature melting salt as a powder, a solid-in-solid dispersion, a solid-in-liquid dispersion or a molten salt.

14 . A vehicle 44 comprising at least one of:
an engine oil comprising a base lubrication oil and a low-temperature melting salt for densifying an ash deposited in a particulate filter for a vehicle exhaust gas system;
a low-temperature melting salt dosage product comprising a low-temperature melting salt dispersed in a solid matrix; and/or
an engine system comprising:
an internal combustion engine arranged to be operated by combustion of a fuel in intake air, arranged to be lubricated by means of an engine oil, and arranged to generate exhaust gases upon combustion of a fuel;
a fuel supply system arranged to convey the fuel to the internal combustion engine;
an air intake system arranged to convey intake air to the internal combustion engine;
a lubrication system arranged to convey the engine oil to the internal combustion engine;
an exhaust gas system arranged to convey the exhaust gases from the internal combustion engine, the exhaust gas system comprising a particulate filter for trapping ash and/or soot dispersed in the exhaust gases; and
a salt dosing unit arranged to dose a low-temperature melting salt to the fuel and/or the engine oil and/or the intake air and/or the exhaust gas system upstream of the particulate filter.

15 . A method according to claim 1 , wherein the particulate filter is brought to a minimum compaction temperature of from 400° C. to 500° C.

16 . A low-temperature melting salt dosage product according to claim 10 , wherein the solid matrix is a controlled-release matrix arranged to controllably release the low-temperature melting salt when submerged in an engine oil at temperatures of 100° C. and over.

Assignees

• Scania Cv Ab

Inventors

• Eriksson Henrik
• Regali Francesco
• Berger Mattias
• Raymand David
• Nylèn Ulf
• Carlsson Joel

Classifications

• F01N2610/12

  the substance being in solid form, e.g. pellets or powder · CPC title

• B01D2279/30

  for treatment of exhaust gases from IC Engines · CPC title

• F01N3/0232 Primary

  removing incombustible material from a particle filter, e.g. ash · CPC title

• F01N2250/14

  absorption or adsorption, and filtering · CPC title

• B01D46/04

  Cleaning filters · CPC title