GB2124643A - Method of cleaning chimneys and the like - Google Patents
Method of cleaning chimneys and the like Download PDFInfo
- Publication number
- GB2124643A GB2124643A GB08222403A GB8222403A GB2124643A GB 2124643 A GB2124643 A GB 2124643A GB 08222403 A GB08222403 A GB 08222403A GB 8222403 A GB8222403 A GB 8222403A GB 2124643 A GB2124643 A GB 2124643A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cleaning composition
- deposit
- cleaning
- composition
- mist
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000000203 mixture Substances 0.000 claims abstract description 54
- 239000003595 mist Substances 0.000 claims abstract description 21
- 239000007921 spray Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 239000000446 fuel Substances 0.000 claims abstract description 6
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 239000002280 amphoteric surfactant Substances 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000004094 surface-active agent Substances 0.000 claims description 13
- 125000000217 alkyl group Chemical group 0.000 claims description 10
- 239000004071 soot Substances 0.000 claims description 9
- 230000001680 brushing effect Effects 0.000 claims description 8
- 239000003599 detergent Substances 0.000 claims description 5
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 4
- 238000010408 sweeping Methods 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- HKLYDUXIXBVZOQ-UHFFFAOYSA-N 2-aminoethane-1,1,1-triol Chemical compound NCC(O)(O)O HKLYDUXIXBVZOQ-UHFFFAOYSA-N 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 239000004902 Softening Agent Substances 0.000 claims description 2
- 239000000443 aerosol Substances 0.000 claims description 2
- 125000000129 anionic group Chemical group 0.000 claims description 2
- 239000002738 chelating agent Substances 0.000 claims description 2
- 238000010410 dusting Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000002985 plastic film Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 125000000547 substituted alkyl group Chemical group 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 125000003342 alkenyl group Chemical group 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- BTXXTMOWISPQSJ-UHFFFAOYSA-N 4,4,4-trifluorobutan-2-one Chemical compound CC(=O)CC(F)(F)F BTXXTMOWISPQSJ-UHFFFAOYSA-N 0.000 description 1
- BQACOLQNOUYJCE-FYZZASKESA-N Abietic acid Natural products CC(C)C1=CC2=CC[C@]3(C)[C@](C)(CCC[C@@]3(C)C(=O)O)[C@H]2CC1 BQACOLQNOUYJCE-FYZZASKESA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical group 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical group 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000000753 cycloalkyl group Chemical group 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- -1 hydroxystearyl Chemical group 0.000 description 1
- 125000001117 oleyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])/C([H])=C([H])\C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000012260 resinous material Substances 0.000 description 1
- 239000012262 resinous product Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/88—Ampholytes; Electroneutral compounds
- C11D1/90—Betaines
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/40—Specific cleaning or washing processes
- C11D2111/42—Application of foam or a temporary coating on the surface to be cleaned
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
A method of cleaning a surface covered by a deposit formed by the incomplete combustion of carbonaceous fuel, which comprises forming a fine spray or mist of a liquid cleaning composition capable of penetrating the deposit, allowing the spray or mist to penetrate and loosen the deposit and thereafter removing the loosened deposit from the surface. The cleaning composition is preferably an aqueous composition containing an amphoteric surfactant and an alkali.
Description
SPECIFICATION
Method of cleaning chimneys and the like
This invention concerns a method of cleaning surfaces covered with deposits of products formed by the incomplete combustion of fuels, such as soot, tars and resinous materials. The method is particularly applicable to chimneys, but is also applicable to other surfaces covered with similar deposits.
These deposits have to be removed periodically to prevent them becoming dislodged and falling down the chimney. They also constitute a fire hazard, and where heat transfer is required through the surface the deposit reduces the heat transfer efficiency, resulting in waste of fuel.
The traditional method of removing said deposits is by brushing which involves time and effort. Brushing is also ineffective against certain types of deposits, especially resins deposited as a result of burning wood. Other methods, such as vacuum application, have been found of limited effect, as have additives to the combustion area to promote burning of the deposits.
The removal of these deposits by washing with liquid compositions is generally precluded for various reasons, for example the absence of adequate drainage and the fire hazard caused by flammable constituents of such washing compositions.
I have now found a new method of cleaning such surfaces which involves the use of an acceptably small volume of a liquid cleaning composition. In this method, the liquid is atomised and a mist of the composition is passed over the surface to loosen or dislodge the deposit.
Cleaning is then completed by removing the loosened deposit by conventional means, e.g.
sweeping or suction.
The pre-treatment of the deposit in this way enables the final cleaning to be effected both more quickly and more easily. The method is also capable of removing resinous products formed by burning wood and similar materials which cannot normally be removed by conventional methods alone.
The invention thus provides a method of cleaning a surface covered by a deposit formed by the incomplete combustion of carbonaceous fuel, which comprises forming a fine spray or mist of a liquid cleaning composition capable of penetrating the deposit, allowing the spray or mist to penetrate and loosen the deposit and thereafter removing the loosened deposit from the surface. The invention also includes liquid cleaning compositions for use in this method.
This method is particularly applicable to domestic chimney cleaning but it can also be applied to other surfaces contaminated with similar deposits, e.g. industrial chimneys, ships funnels, boilers and furnaces.
The spray or mist of the cleaning compositions may be formed by atomising the composition under pressure. Conventional atomisation systems may be used, conveniently equipped with a nozzle which enables the atomised material to be directed as required. In the case of a chimney, the natural draught carries the mist up the chimney without assistance in some circumstances and as the mist moves up it penetrates and loosens the deposit; however, the movement of the mist across the surface can if necessary be assisted by blowing.
The cleaning composition used in my method is based on a non-flammable liquid carrier, preferably water, together with one or more chemicals capable of penetrating and loosening the deposit. The composition will thus usually contain a detergent, which is preferably an amphoteric surface active agent.
The surfactant is preferably of the type having the general formula (I) or (II)
where
R is a C820 hydrocarbyl group, optionally substituted; R' is H or 1-6 alkyl; B is H, alkyl or substituted alkyl, or a group Q as defined below;
Q is an anionic moiety; xis 2 to 6;
y is O to 5; and z is O or 1.
In these compounds, R may for example be an alkyl, alkenyl or cycloalkyl group, an aralkyl or aralkenyl group in which the alkyl or alkenyl portion contains at least 6 carbon atoms; or the hydrocarbyl portion of a resinic acid containing at least two fused rings, e.g. as in the tricyclic pine resin acids such as abietic acid. R is preferably a C 10-16 alkyl group, e.g. a C,2 group. R may for example be the hydrocarbyl portion of lauric or coconut fatty acid, both of which contain a high proportion of C12 constituents. An example of an unsaturated R group is oleyl. R may for example be substituted by hydroxy, as in hydroxystearyl.
R1 is usually a hydrogen atom, but may be an alkyl group such as methyl.
When B is an alkyl group, it may have 1-6, preferably 2-4, carbon atoms, and is preferably a straight chain group. Examples of such groups are methyl and ethyl. The alkyl group may be substituted, for example by hydroxy, as in 2hydroxyethyl, or by amino.
The group Q may for example be of the formulaR2COOM where R2 is a C16 alkylene group (such as methylene or ethylene) and M is hydrogen or an alkali metal, alkaline earth metal, ammonium or substituted ammonium ion (e.g.
mono-, di- or tri-hydroxyethylammonium). M is preferably sodium, and R2 is preferably methylene.
x is preferably 2 and y is preferably 0 or 1.
The surfactant thus preferably has one of the following structures:
RN(CH2CH2COOM)2
RNH.CH2CH2COOM
RNH.CH(CH3)CH2COOM
The surfactant is generally used in an amount of up to 5% by weight of the cleaning composition, preferably 0.11.0%.
The cleaning composition may also contain an alkali, preferably in addition to the surface active agent. The alkali is preferably a strong alkali such as sodium hydroxide, and is generally present in an amount of up to 20% by weight of the composition, preferably 0.55%.
The cleaning composition may also contain further additives, for example water-softening agents and chelating agents.
The amount of cleaning composition used in any particular case will of couse depend on the particular circumstances, varying for example according to the area of the surface to be treated, the nature and amount of the deposit and the nature of the cleaning composition. As a general guide however, from 0.25-0.75 litres of the preferred composition described above will normally be sufficient for domestic chimney cleaning.
In the example below the following cleaning composition was used:
sodium hydroxide 4 9 AmpholakXCE 1 g
water 95 ml ("Ampholak" is a trade mark of Amphoterics
Internation Ltd.).
Example 1
A high pressure pump was used which generated a pressure of about 800 p.s.i. and which was fitted with a nozzle capable of producing a fine spray or mist of the cleaning composition.
About 0.5 litre of the cleaning composition described above was atomised to a fine spray or mist. This mist, assisted by natural draught, was blown, for a few seconds, up the chimney of a wood-burning fire wherein resinous deposits as well as soot has accumulated. The chimney was then swept with a normal brush used for sweeping chimneys. Very little brushing was needed to ensure complete removal of the deposits, less effort was required and the process was effected in less than one third the time normally required for such an operation.
Furthermore, the results were superior to those obtained without use of the cleaning composition, even after extending brushing.
Example 2
Similar tests to those of Example 1 were conducted in a coal-burning fire and less brushing was needed than would normally be the case.
Less effort was required and the cleaning was effected more quickly. Furthermore the presence of the said small amount of liquid dampended the soot, resulting in less dusting and consequently less mess.
The following example is given to demonstrate the efficiency of the cleaning composition in other uses.
Example 3
The cleaning composition was placed in a small hand-held applicator wherein a small pressure was generated by squeezing a lever.
Using this simple apparatus, a small amount of the composition was sprayed onto a plastic sheet heavily contaminated with soot. The area sprayed immediately appeared cleaner and simple wiping left a prefectly clean surface with no remaining soot particles. An aerosol applicator may similarly be used.
Claims (Filed on 1-8-83) 1. A method of cleaning a surface covered by a deposit formed by the incomplete combustion or carbonaceous fuel, which comprises forming a fine spray or mist of liquid cleaning composition capable of penetrating the deposit, allowing the spray or mist to penetrate and loosen the deposit and thereafter removing the loosened deposit from the surface.
2. A method as claimed in claim 1 wherein the surface is the surface of a chimney, a boiler, a furnace of a ship's funnel.
3. A method as claimed in claim 1 or claim 2 wherein the spray or mist is formed by atomising the liquid cleaning composition.
4. A method as claimed in any one of the preceding claims wherein the cleaning composition is an aqueous composition containing a detergent.
5. A method as claimed in claim 4 wherein the detergent is an amphoteric surfactant.
6. A method as claimed in claim 5 wherein the surfactant is of the type having the general formula (I) or (II)
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (15)
1. A method of cleaning a surface covered by a deposit formed by the incomplete combustion or carbonaceous fuel, which comprises forming a fine spray or mist of liquid cleaning composition capable of penetrating the deposit, allowing the spray or mist to penetrate and loosen the deposit and thereafter removing the loosened deposit from the surface.
2. A method as claimed in claim 1 wherein the surface is the surface of a chimney, a boiler, a furnace of a ship's funnel.
3. A method as claimed in claim 1 or claim 2 wherein the spray or mist is formed by atomising the liquid cleaning composition.
4. A method as claimed in any one of the preceding claims wherein the cleaning composition is an aqueous composition containing a detergent.
5. A method as claimed in claim 4 wherein the detergent is an amphoteric surfactant.
6. A method as claimed in claim 5 wherein the surfactant is of the type having the general formula (I) or (II)
where
R is a C820 hydrocarbyl group, optionally substituted;
R' is H or C16 alkyl;
B is H, alkyl or substituted alkyl, or a group
Q as defined below;
Q is an anionic moiety; xis 2 to 6;
y is O to 5; and
z is 0 or 1.
7. A method as claimed in claim 6 wherein the
surfactant has one of the following structures:
RN(CH2CH2COOM)2
RNH.CH2CH2COOM
RNH.CH(CH3)CH2COOM
8. A method as claimed in any one of claims 5 to 7 wherein the composition contains 0.1 - 1.0% by weight of the surfactant.
9. A method as claimed in any one of claims 4 to 8 wherein the cleaning composition also contains an alkali.
10. A method as claimed in claim 9 wherein the alkali is sodium hydroxide.
11. A method as claimed in claim 9 or claim 10 wherein the composition contains 0.55% by weight of an alkali.
12. A method as claimed in claim 5 wherein the cleaning composition contains 0.1-1.0% by -weight of surfactant as defined in claim 7 and 0.55% by weight of sodium hydroxide.
13. A method as claimed in any one of the preceding claims wherein the loosened deposit is removed by sweeping or suction.
14. A method as claimed in claim 1, substantially as described herein in any one of the
Examples.
15. An aqueous cleaning composition as defined in any one of claims 4 to 12, when intended for use in a method as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08222403A GB2124643B (en) | 1982-08-03 | 1982-08-03 | Method of cleaning chimneys and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08222403A GB2124643B (en) | 1982-08-03 | 1982-08-03 | Method of cleaning chimneys and the like |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2124643A true GB2124643A (en) | 1984-02-22 |
| GB2124643B GB2124643B (en) | 1986-03-12 |
Family
ID=10532086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08222403A Expired GB2124643B (en) | 1982-08-03 | 1982-08-03 | Method of cleaning chimneys and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2124643B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2561367C1 (en) * | 2014-05-20 | 2015-08-27 | Открытое акционерное общество "Уфимское моторостроительное производственное объединение" ОАО "УМПО" | Method of cleaning of fuel manifold with injectors of combustion chamber of gas-turbine engine of fuel coking products |
| RU2614441C1 (en) * | 2015-10-07 | 2017-03-28 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" (ФГУП "ВИАМ") | Method for cleaning parts of fuel manifolds of gas turbine engines from sludge and carbon pollution |
| RU2650438C1 (en) * | 2017-05-04 | 2018-04-13 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Рыбинский государственный авиационный технический университет имени П.А. Соловьева" | Method of cleaning a duplex nozzle of combustion chamber of gas turbine engine of products from the coking of fuel and carbon and device for its implementation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1157976A (en) * | 1965-10-01 | 1969-07-09 | Spitzer Joseph G | Aerosol Oven Treating Compositions |
| GB1250357A (en) * | 1967-11-24 | 1971-10-20 | ||
| GB1309092A (en) * | 1969-12-23 | 1973-03-07 | Pyrene Chemical Services Ltd | Process of and materials for cleaning the paintwork of road vehicles |
| GB1342077A (en) * | 1970-10-15 | 1973-12-25 | Rivenaes I | Cleaning engines and boilers |
| GB1474389A (en) * | 1974-06-18 | 1977-05-25 | Pyrene Chem Services Ltd | Cleaning composition and method |
-
1982
- 1982-08-03 GB GB08222403A patent/GB2124643B/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1157976A (en) * | 1965-10-01 | 1969-07-09 | Spitzer Joseph G | Aerosol Oven Treating Compositions |
| GB1250357A (en) * | 1967-11-24 | 1971-10-20 | ||
| GB1309092A (en) * | 1969-12-23 | 1973-03-07 | Pyrene Chemical Services Ltd | Process of and materials for cleaning the paintwork of road vehicles |
| GB1342077A (en) * | 1970-10-15 | 1973-12-25 | Rivenaes I | Cleaning engines and boilers |
| GB1474389A (en) * | 1974-06-18 | 1977-05-25 | Pyrene Chem Services Ltd | Cleaning composition and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2561367C1 (en) * | 2014-05-20 | 2015-08-27 | Открытое акционерное общество "Уфимское моторостроительное производственное объединение" ОАО "УМПО" | Method of cleaning of fuel manifold with injectors of combustion chamber of gas-turbine engine of fuel coking products |
| RU2614441C1 (en) * | 2015-10-07 | 2017-03-28 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" (ФГУП "ВИАМ") | Method for cleaning parts of fuel manifolds of gas turbine engines from sludge and carbon pollution |
| RU2650438C1 (en) * | 2017-05-04 | 2018-04-13 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Рыбинский государственный авиационный технический университет имени П.А. Соловьева" | Method of cleaning a duplex nozzle of combustion chamber of gas turbine engine of products from the coking of fuel and carbon and device for its implementation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2124643B (en) | 1986-03-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |