Solution for deleting deposits of different nature
SUBSTANCE: solution for purifying the surface from the deposits of different nature, containing hydrogen peroxide, chelating agent, water-soluble calixarene and water in the following ratio, wt %: hydrogen peroxide 2-90, chelating agent 3-30, water-soluble calixarene 0.01-10, water - the rest, wherein it contains the chelating agent in the form of polybasic organic acids, their sodium salts or derivatives of phosphorous acids. Also, a concentrated component for preparing the said solution, a method for preparing a solution, and methods for purifying the surface from deposits of different nature are proposed.
EFFECT: increasing the degree of purification from sediments of different nature with a simultaneous decrease in the aggressiveness of the solution to structural materials.
19 cl, 2 tbl
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 70-130°C 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 50-70°C.
EFFECT: higher power and process efficiency, decreased consumption of cleaning composition, non-polluting process.
3 cl, 6 tbl, 1 ex
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 50-80°C 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
SUBSTANCE: method includes washing the cavity to be treated with a solution of a washing reagent at 50-80°C 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
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.
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.
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 90-100°C; 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 150-420°C, 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 (250÷300) mcg/dm3. Cleaning is performed in one step at boiler pressure of 1.5÷2.5 MPa and working fluid temperature not exceeding 230°C to stabilisation of iron content in boiler water. Passivation is performed at boiler pressure of 2.5÷15.5 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 20-60°C 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 20-100°C or with mix of water with steam heated to 100-155°C.
EFFECT: higher efficiency of cleaning the surfaces located between heat exchanger ribs.
3 cl, 6 ex
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.
FIELD: process engineering.
SUBSTANCE: invention relates to removal oil from oiled iron/steel chips and scale of rolling process slimes. In compliance with proposed process, oiled scale of rolling process slimes, oiled iron/steel chips sized to not over 15 mm and clean process water are mixed at the ratio of 2:1:6. Then, they are processed in reactor with magnetic field of 50 Hz frequency and intensity varying from 200 A/m to 1100 A/m to produce clean scale and chips.
EFFECT: efficient, non-polluting process.
SUBSTANCE: in the method the cleaning of containers of liquid-propellant rockets after start from fuel components is performed, in which fuel is unsymmetrical dimethyl hydrazine and the oxidiser is nitric tetroxide, by washing the container manifolds with neutralising solution. At that preliminary washing of filling manifold is carried out with water under pressure from a volume equal to the volume of the manifold, after which the fuel manifold is washed with an aqueous solution of potassium permanganate with a concentration of not less than 0.1%, and the oxidiser manifold - an aqueous solution of caustic soda with the concentration of not less than 0.025%, at that the safety of drainage and the container manifolds is controlled for subsequent disposal.
EFFECT: invention provides a high degree of cleaning of the enclosed volume of the piping from components of rocket fuel.
SUBSTANCE: proposed method involves application to metal surface of a gel-electrolyte containing polyethyleneglycol, perchlorate of alkali metals, trifluoroacetate of alkali metals and two monomers of an acrylic row. Gel-electrolyte is applied with thickness of ≤ 1 mm, brought into contact with an electrode made from material that is neutral in relation to gel-electrolyte; at that, contact of the above electrode with metal surface being cleaned is fully excluded. Between the electrode and the metal surface being cleaned there created is electric stress, at which the electrode is an anode, and the value of which exceeds electrode potential of metal that purifies the above metal surface. After cleaning the gel-electrolyte is removed from metal surface.
EFFECT: invention provides effective cleaning of surface of any metals, accelerates a cleaning process and allows controlling surface cleaning quality.
10 cl, 2 dwg
SUBSTANCE: method involves cleaning an archaeological object, hydrothermal treatment of the object in a diluted alkaline solution at temperature of 100-250°C and pressure of 10-30 atm for at least 1 hour, washing until complete removal of chloride ions and drying, followed by depositing a protective coating. After washing, presence of chloride ions in the prepared archaeological object is inspected.
EFFECT: invention improves preservation of archaeological finds made from iron and alloys thereof and information contained therein, while simplifying and reducing the cost of the method.
2 cl, 2 ex
SUBSTANCE: cleaning method of surfaces of turbine blades in chemically active media at pressure of gas medium and temperature exceeding critical pressure and fusion temperature of chemical environment is implemented in turbine blade surface cleaning unit the working chamber of which is made from nickel plate material in the form of thin-wall shell in which chemically active medium is heated with resistance-type heater to the temperature exceeding its fusion temperature by 11-25 degrees at gas pressure exceeding critical pressure of chemically active medium of 2.2 to 4 MPa, and periodic change of level of chemically active medium is performed during exposure owing to reducing the medium temperature in working chamber below its fusion temperature by 3-9 degrees with further heating to initial temperature, as well as owing to condensation of vapours of liquid component of chemically active medium with inert gas supplied with compressor with further pressure release in the range of 0.1-0.4 MPa.
EFFECT: invention allows cleaning the turbine blade surface from residues of mould and carbon deposit, enlarging the service life of clean turbine blades, reducing the quantity of defects at manufacture of blades and enlarging treatment capabilities of turbine blades.
6 cl, 4 dwg
SUBSTANCE: method involves pulling a metal wire or strip through a correct assembly, a module of mechanochemical cleaning, a tank with viscous oil, an electric arc cleaning module with input and output airtight sluices and an arc discharge zone, an assembly of automatic cooling of wire or ribbon through cooling metal press rollers. Whereby, in the mechanochemical stripping module the wire or strip are pre-cleaned mechanically by using brushes or abrasive material supplied under pressure or it is subjected to chemical etching, or subjected to mechanical cleaning with chemical underetching. The device may contain additional modules of mechanochemical stripping and electric arc cleaning, whereby electric arc cleaning modules are selectively alternated with mechanochemical stripping modules.
EFFECT: invention enables to improve the quality of cleaning of metal wire or strip, reduce energy costs for their treatment, and improve the performance of cleaning process while reducing its cost.
4 cl, 1 dwg
SUBSTANCE: method involves placing products into a pressure tight electric furnace, preheated to a temperature of 250-300 °C, a continuous supply of superheated water steam into the electric furnace, which forms pressure in the furnace of 0.15-0.2 atm, conditioning of products in the superheated water steam for 10-20 min with a simultaneous increase in temperature in the electric furnace up to 450-550 °C and conditioning of the products at this temperature for 15-30 min.
EFFECT: invention facilitates preparing the surface of metal products for coating using an environmentally friendly method without using chemical additives and substances as well as improves adhesion of coatings with the surface of products by forming an underlayer as an oxide film of optimum thickness and porosity on the surface.
FIELD: process engineering.
SUBSTANCE: invention relates to method of cleaning metal archeological finds of corrosion and may be used for preliminary restoration of applied art articles. Proposed method comprises mechanical cleaning, degreasing and etching combined with ultrasonic treatment and preservation. Note here that prior to etching, archeological article is subjected to microwave electromagnetic radiation at 2450 MHz, 0.5-1.0 kW, for 10-20 seconds.
EFFECT: intensified cleaning, better quality.
SUBSTANCE: procedure consists in heat treatment of scale accompanied with transition of oil into vapour phase and in removal of oil from zone of heat treatment. Heat treatment is performed by heating scale to temperature 180÷280°C at its mixing and in conditioning at said temperature till contents of oil in scale reaches as high, as 1.5%. Also, oil is removed from the zone of heat treatment in form of its vapours.
EFFECT: simplification of procedure.
2 cl, 3 ex
SUBSTANCE: method involves evacuation and treating substrates in oxygen-containing plasma. Substrates are treated in a plasma mixture of oxygen and inert gas containing 5-12 vol. % oxygen and 88-95 vol. % inert gas. The inert gas is helium, neon or argon and treatment is carried out at temperature in the reaction chamber equal to 80-140 Pa, radio-frequency power equal to 0.02-0.06 W/cm3 and exposure time of 3-15 minutes.
EFFECT: invention improves electrophysical parametres of piezoelectric devices owing to more complete removal of organic residue from piezoelectric substrates after different processes.
SUBSTANCE: in the method after the first jet washing, the second operation of parts washing is carried out in the form of mutually related jet and submerged washing distributed among baths, and replenishment of washing water in appropriate tanks and/or collectors is done by washing water from a washing bath by the submerged method, supplying it via distribution headers with elements for formation of jets with submillimetre section of appropriate baths of jet washing. Supply of washing water into distribution headers with elements for formation of jets of submillimetre section of the second stage of jet washing is carried out directly from a washing bath by submersion with the help of a submerged pipeline placed in it and connected with a local discharge system, the outlet of which is connected via three-way actuating mechanisms with a distribution header of the second stage of jet washing, a drainage pipeline of which is connected with a tank to drain contaminated washing water, equipped with a local discharge system, the outlet of which is connected via three-way actuating mechanisms with a distribution header of the first bath of jet washing.
EFFECT: higher efficiency, reliability and expansion of functional and technological capabilities realised in an effluent-free mode of operations for washing of parts in perforated drums.
5 cl, 1 dwg