Composition for cleaning of heat transfer system with aluminum components

FIELD: chemistry.

SUBSTANCE: cleaner concentrate is described for a vehicle heat transfer system comprising an aluminum component, manufactured by brazing in a protective atmosphere containing more than 15 wt % of freezing temperature reduction means, 8 to 35 wt % of oxalic acid and an azole compound wherein the wt % is based on the total weight of the cleaner concentrate.

EFFECT: concentrate is a homogeneous solution.

17 cl, 6 tbl, 32 ex

 



 

Same patents:

FIELD: power industry.

SUBSTANCE: in the method of steam and chemical cleaning and passivation of surfaces of metal pipes which is characterized by their purging with water vapour with oxidizer and activators of cleaning process into the water vapour flow during their purging first the reagent is added which emits carbon oxide - water solution of formic acid, then hydrogen and at the end of the process oxygen is added.

EFFECT: improvement of efficiency of cleaning and passivation of internal surfaces of heat exchange pipes due to performing the process in three stages at consecutive dosing in the flow of steam of reagent of the formic acid decayed with release of carbon oxide in the following sequence: formic acid, hydrogen and oxygen.

FIELD: process engineering.

SUBSTANCE: invention relates to cleaning the heat exchanger surfaces of scale and corrosion. This process involves application of ascorbic acid, complexing agent, water and, possibly, auxiliary additives to be forced or pouted via heat exchanging hardware. Cleaning composition is fed from expansion tank of cavitation-thermal generator. The latter allows a hydrodynamic heating of cleaning fluid to 70-130C and swirling of liquid by hydrodynamic cavitation. Note here that before application of said composition heat exchange hardware is filled with water to be heated by cavitation-thermal generator to 50-70C.

EFFECT: higher power and process efficiency, decreased consumption of cleaning composition, non-polluting process.

3 cl, 6 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: method for cleaning involves dividing a heat exchange system on the following circuits: a loop of the diesel water cooling system, a loop of air-water radiator sections of the water cooling system of the locomotive diesel and turbo compressor, a loop of air-water radiation sections of the water cooling system of oil and charging air, a turbo compressor loop, a charging air coolant loop, an oil-water heat exchange loop, an oil heater loop, and an operator's cab heater loop. That is combined with the separate washing of each of the above loops with a washing agent at its temperature of 50-80C with periodic change in the solution flow direction through the loop cavity, neutralisation of the agent solutions and anti-corrosion treatment. The washing solution is a solution containing, wt %: sulphamic acid - 2-5, ethylene diamine tetraacetic acid disodium salt - 1-1.5, a corrosion inhibitor - 0.1-0.2, water - the rest.

EFFECT: more effective cleaning of the heat exchange systems, higher operability, improved anticorrosion properties of the treated surfaces and safety of the method.

9 cl, 2 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: method includes washing the cavity to be treated with a solution of a washing reagent at 50-80C and periodically changing the direction of flow through the cavity, wherein the solution used has components in the following ratio, wt %: sulphamic acid - 2-5, disodium salt of ethylendiaminetetraacetic acid - 1-1.5, corrosion inhibitor - 0.1-0.2, water - the balance. The solution of the washing reagent is then neutralised with sodium hydroxide solution, followed by anti-corrosive treatment of the cavity by washing with a passivating solution.

EFFECT: high effectiveness of the action of the treating liquid on the internal surface of a cavity of heat-exchange equipment.

10 cl, 1 dwg

FIELD: heating.

SUBSTANCE: method of cleaning heat exchanger from carbonate deposits is provided, comprising feeding of geothermal water with a concentration of carbon dioxide above the equilibrium value, which is generated by increasing the total, respectively, and the partial pressure of carbon dioxide in the cleaned heat exchanger. The cleaned heat exchanger is connected in series to the clean the heat exchanger, and from the geothermal water before feeding to the clean heat exchanger a part of carbon dioxide is removed to the equilibrium value and fed into the geothermal water before feeding to the cleaned heat exchanger, the partial pressure of carbon dioxide in the cleaned heat exchanger is maintained at a level above the equilibrium value.

EFFECT: invention enables to improve the efficiency of cleaning the heat exchanger and to avoid heat loss of geothermal water used for hot water supply.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil production and may be used for paraffin deposits removal from heat exchangers at oil heating unit. Method of paraffin deposits removal from heat exchangers consist in removal of heated and liquefied paraffin by hot oil flow, at that the line of reverse oil delivery is connected to heat exchangers and at pressure drop between oil pressure at the input to heat exchangers and pressure at their output from 0.9 up to 0.95 of the maximum allowable value for these heat exchangers oil delivery is switched from their input to the output thus forming the reverse oil flow mode, which is maintained till the preset pressure drop is attained at each heat exchanger at the oil heating unit, thereupon oil delivery is switched to the input of heat exchangers.

EFFECT: design simplification of the oil heating unit both in operation mode and cleaning mode with permanent heated oil delivery to consumers.

1 dwg

FIELD: chemistry.

SUBSTANCE: disclosed is a method of cleaning the inner surface of boiler tubes via treatment thereof in a separate loop with a hot water-based cleaning medium with addition of a chemical agent in form of an aqueous solution of a disodium salt of ethylenediaminetetraacetic acid. Said hot medium is boiler water at temperature of 90-100C; the aqueous solution of said chemical agent is added to said medium for 40-80 minutes until achieving concentration thereof in the boiler water of 1.0-1.2 wt % at pH=5.0-6.0. Post-treatment and passivation of the inner surface of the boiler tubes is then carried out by switching to boiler operation in starting conditions while raising pressure and temperature of the boiler water at pH=8.8-9.3 to 3.0-25.0 MPa and 150-420C, respectively, and feeding oxygen with concentration of 1.8-2.2 g/dm3 into the boiler water for 9-12 hours and gradually removing said chemical agent from the treated loop for 40-80 minutes.

EFFECT: high reliability of operation of explosion-proof devices in case of accidental explosion at a facility and reduced release of hazardous substances into the atmosphere.

3 dwg, 3 tbl

FIELD: power engineering.

SUBSTANCE: proposed method comprises processing of pipes in isolated circuit by hot detergent water-based solution containing nitrogen-bearing chemical reagent. Said nitrogen-bearing chemical reagent represents a film-forming amine while batching of detergent solution is performed at concentration of chemical reagent in the boiler of (250300) mcg/dm3. Cleaning is performed in one step at boiler pressure of 1.52.5 MPa and working fluid temperature not exceeding 230C to stabilisation of iron content in boiler water. Passivation is performed at boiler pressure of 2.515.5 MPa and working fluid temperature equal to saturation temperature for boiler pressure to stabilisation of iron content in boiler water not exceeding 50 mcg/dm3.

EFFECT: lower costs.

2 cl, 2 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to cleaning outer aluminium surfaces of air cooling hardware. Proposed method comprises processing of surface with detergent and flushing with water. Note here that cleaning is conducted in three steps. At first and third steps, surface is flushed with heated water or the mix of water with steam at jet pressure of 20-150 bar. At second step, surface is flushed with 0.25-1.5% water solution of acidic detergent heated to 20-60C at jet pressure of 20-150 bar and duration of 10-30 minutes. Used detergent comprises the following substances at the following ratio of components in wt %: orthophosphoric acid - 20.0-25.0, nitric acid - 8.0-15.0, oxyethylidenediphosphorus acid - 2.0-4.5, non-ionic surfactant - 0.05-0.11, water making up to 100. At first and third steps, surface is flushed with water heated to 20-100C or with mix of water with steam heated to 100-155C.

EFFECT: higher efficiency of cleaning the surfaces located between heat exchanger ribs.

3 cl, 6 ex

FIELD: heating.

SUBSTANCE: device for leakage check, flushing and determining the heat emission of vehicle radiators relates to washing equipment and can be used to clean radiators of cooling systems for internal combustion engines. The device comprises a test chamber, tubular electric heaters, a tank, a compressor, a circulation pump, a filter and pipelines, a clamp for a radiator with a removable top allowing for the installation of radiators of different dimensions in it, a manually controlled four-position distributor, a drain tap.

EFFECT: device allows for check of leakages, flushing of a radiator and determination of the heat emission factor.

1 dwg

FIELD: power industry.

SUBSTANCE: flushing method of condensers with short-time return water flow involves an operating condenser filled with water, a supply water conduit having a shutoff gate valve and an operating forcing pump, an outlet water conduit having a shutoff gate valve, and an upper drain water chamber having a manhole hatch. Return water flow in the condenser is formed at performance of the following operations: shutoff gate valve is closed on an outlet water conduit, and after it is closed, the forcing pump on the supply water conduit is switched off. After the pump is stopped, the manhole hatch is opened on upper drain water chamber, and after the air suction through it to the condenser is completed, the manhole hatch is closed. Then, normal operation of the condenser and power of the turbine generator are restored. Such a method can be used at reduced power of the turbine generator for operation without any condenser.

EFFECT: at creation of short-time return water flow, soft and muddy deposits are washed off tubes of condensers; as a result, vacuum is improved in it and power of turbine generator increases.

1 dwg

FIELD: power industry.

SUBSTANCE: control method of operation of cleaning devices of the boiler furnace heating surfaces involves electromagnetic emission scanning of walls and water wall tubes of the furnace, determination of critical slagging intensity of its heating surfaces and activation and deactivation of cleaning devices. It is proposed to scan the furnace water walls through opposite lying hatches by means of electromagnetic emission with a directivity pattern in the form of a narrow beam; scanning of walls is performed by linear movement of the narrow beam, in horizontal plane and across water wall tubes; initial scanning of walls is performed prior to the beginning of the furnace operation; a variable component determined with a regular structure of the wall surface is separated from the accepted reflected electromagnetic signal and transmitted to the filter-detector that is tuned to parameters of the signal; further scanning operations of the same walls are performed during the furnace operation; those reflected signals are received and supplied to the filter-detector; slagging intensity degree of each section of the heating surface is determined as per the value of electromagnetic signal from the filter-detector outlet.

EFFECT: method improves accuracy and reliability of detection of critically slagged surfaces.

5 dwg

FIELD: heating.

SUBSTANCE: heat exchange system with a heat exchanger comprises inlet and outlet surfaces. To exchange heat between a transportation liquid medium and coolant flowing through the heat exchanger in the working condition, the transportation liquid medium supply is provided through a supply surface of the heat exchange system and the inlet surface to the heat exchanger, bringing in contact with the heat exchanger and again discharge via an outlet surface from the heat exchanger. According to the invention, the heat exchange system for removal of dirt comprises an automatic cleaning system.

EFFECT: automatic system of heat exchanger filter treatment in process of operation, elimination of heat exchange system outage.

12 cl, 6 dwg

FIELD: heating.

SUBSTANCE: heat-exchange plates form the first gaps between plates for the first medium and the second gaps between plates for the second medium. Casing envelopes plate pack and contains round cylindrical outer cover and two end plate elements. Outer cover determines central axis (x) passing through two end plate elements. The first medium flows via the first inlet hole and the first outlet hole to plate-type heat exchanger and from it and flow through the appropriate end plate element. The second medium flows via the second inlet hole and the second outlet hole to plate-type heat exchanger and from it. Plate pack has the space which is located inside the first inlet hole and the first outlet hole. Devices for creating, for each of the first gaps between plates, of inlet hole for the first medium from space to the first gaps between plates and outlet hole for the first medium from the first gaps between plates to the space.

EFFECT: improved design of heat exchanger having larger dimensions and simpler cleaning and maintenance.

40 cl, 11 dwg

FIELD: heating, fuels.

SUBSTANCE: invention relates to heat engineering, particularly, to heating various-purpose buildings, namely, to the designs of water-heating systems and those designed to stabilise and recovery of heat exchange. The proposed water-heating system comprises hear lines that deliver heat carrier from direct main pipeline to riser pipes arranged in party walls and from floor party walls to the inlet of every heat exchanger mounted at the centre of window stool zone. The outlet of each heat exchanger is connected to the inlet of the next floor heat exchanger. The last floor heat exchanger outlet communicates with the pipe that deliver heat carrier to return pipe of the main pipeline that features top arrangement and shut-off valves. Every riser pipe and heat exchanger allows cleaning them of deposits and corrosion. To this end, the riser pipes mounted in party walls are connected by flexible hoses at their centres and jointed between vertical and horizontal lines. Note that divided heat exchangers feature plugged holes aligned with section channels at the top of two-channel sections or on top of the upper header. The invention covers also the versions of the heating system, versions of the method of cleaning of deposits and corrosion, heat exchanger versions and indoor temperature control method.

EFFECT: longer life of heating system, easier servicing, improved indoor temperature control.

20 cl, 7 ex, 27 dwg

FIELD: heating engineering.

SUBSTANCE: invention concerns deposits formed on heat exchange surfaces in heating and/or hot water-supply systems. Treatment and neutralization plant comprises heating unit, water treatment unit provided with water-swirling device and impurity-precipitation device, and deposit neutralization unit constructed in the form of chemical reagent dispenser mounted upstream of heating unit. Water-swirling device is designed as centrifugal separator provided with vent. Impurity-precipitation device is designed as solid fraction withdrawal device further equipped with heat exchanger to heat water used to additionally feeding the system. Plant can optionally be provided with vibroacoustic device affecting centrifugal separator and/or solid fraction withdrawal device.

EFFECT: enhanced efficiency of treatment and neutralization of deposits under non-stop conditions with simultaneous degassing and purification of liquid contained in the system, reduced heat consumption, and prolonged service time of all structural system elements.

2 cl, 1 dwg

FIELD: equipment for cleaning the heating surfaces of the heat exchange equipment, in particular, in low-pressure steam and hot-water boilers, turbine condensers, fodder steamers, etc from salt deposits (scale) on the working heating surfaces.

SUBSTANCE: the device has a pulse oscillator and a mechanical vibration radiator, the radiator is made in the form of a flat inductor with a winding connected to the pulse oscillator, and the outer metal surface of the heat exchange equipment engaged with the inductor is made of diamagnetic material. Such a construction makes it possible to use the energy of the pulse electromagnetic field produced by the flat inductor for water treatment.

EFFECT: enhanced efficiency of prevention of scale formation on the working heating surfaces.

2 dwg

The invention relates to a power system, and in particular to means and methods for cleaning and corrosion protection of surfaces of heat exchangers and pipelines, in particular for protection from scale systems heating, cooling, water supply and so on
The invention relates to the field of corrosion protection and can be used at the enterprises producing and operating of steel products, mainly pipes

The invention relates to heat engineering and can be used in energy, transport and nuclear technology

FIELD: chemistry.

SUBSTANCE: described is a sanitary-hygienic cleaning agent containing the following components, wt %: hydrogen chloride (with respect to 36% hydrochloric acid 15.5-22) 5.58-7.92, nonionic surfactant 0.5-1.6, polyelectrolyte 2.0-6.0, hexamethylenetetramine 0-4.0, acid corrosion inhibitor 0.03-0.1, water - the balance. The acid corrosion inhibitor used is a reaction product of polyethylene polyamines with benzyl chloride in molar ratio 1:3, respectively, or a reaction product of polyethylene polyamines with oleic acid and benzyl chloride in molar ratio 1:1:3, respectively.

EFFECT: high efficiency of removing rust and hardness salt deposits from toilet bowls, faience sinks and ceramic tile surfaces, faster treatment and longer shelf life of the cleaning agent.

3 cl, 4 ex

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