SU589288A1

SU589288A1 - Method of submerged gas heating of a solution

Info

Publication number: SU589288A1
Application number: SU742067613A
Authority: SU
Inventors: Яков Израилевич Гольдштейн; Владимир Хрисанфович Касьян; Владимир Семенович Шаляхин; Ян Натанович Липкин; Анатолий Николаевич Минаев; Михаил Михайлович Челядин; Арнольд Яковлевич Каботянский; Виктор Андреевич Сержантов; Иосиф Абрамович Фрисман; Спартак Семенович Малыгин
Original assignee: Днепропетровский Трубопрокатный Завод Имени Ленина
Priority date: 1974-10-02
Filing date: 1974-10-02
Publication date: 1978-01-25

Description

1 one

Изобретение относитс к химической обрботке поверхности металлов, в частности травлению стальных изделий в растворах, требующих поддержание повышенной температуры .The invention relates to the chemical treatment of metal surfaces, in particular, the etching of steel products in solutions that require maintaining elevated temperature.

Известен способ поддержани температуры раствора путем смешени части отход щего из раствора газа с инжектирующим газом и последую11 ей подаче смеси в растворе l.A known method of maintaining the temperature of the solution is by mixing a part of the gas out of the solution with the injecting gas and then feeding the mixture in solution l.

Известен также способ погруженного газового разогрева раствора передачей тепла при контакте с газом-теплопосителэм, получен 1ым при сжигании топлива 2j.There is also known a method of submerged gas heating of the solution by heat transfer upon contact with gas-thermal support, which was obtained by the 1st combustion of fuel 2j.

Данный способ вл етс наиболее близким к предлагаемому изобретению по технической сущности и достигаемому результату , так как позвол ет интенсифицировать процесс травлени (удаление окалины) иThis method is the closest to the proposed invention in its technical essence and the achieved result, as it allows to intensify the etching process (descaling) and

снизить скорость коррозии металла(оаствоpemie чистого от окалины металла), благодар наличию ингибируюшего эффекта при вводе в раствор газов, содержащих двуокис углерода.to reduce the corrosion rate of the metal (the removal of metal scale clean from scale), due to the presence of an inhibiting effect when gases containing carbon dioxide are introduced into the solution.

Общим недостатком известных способов вл етс то, что они не обеспечивают глубины регулировани технологических параметров и молоэффективно используют греющие газы ввиду их смешени с холодными газами.A common drawback of the known methods is that they do not provide the depth of adjustment of the technological parameters and they effectively use heating gases due to their mixing with cold gases.

Цель изобретени - повышение экономичности процесса.The purpose of the invention is to increase the efficiency of the process.

Дл этого газ-теплоноситель предварително смешивают с частью отход щих из раствора газов, полученную смесь инжектируют сжатым газом при давлении 1-10 кг/см , при этом отношение массы смеси к массе инжектирующего газа устанавливают 2:9, а в качестве инжектирующего газа беру.т сжтый воздух при 5О-100 С.For this, the heat carrier gas is preliminarily mixed with a part of the waste gases from the solution, the resulting mixture is injected with compressed gas at a pressure of 1-10 kg / cm, while the ratio of the mass of the mixture to the mass of injecting gas is set to 2: 9 and I take it as an injecting gas. t compressed air at 5O-100 C.

Claims

The process of heating the solution, for example, by etching the steel in a 20% solution of sulfuric acid at 60-85 ° C, is carried out with a gas mixture having a temperature of about 40 ° C which is formed by mixing gases from the solution with a temperature of about 8 ° C with products burning natural gas, having a temperature of about 2000 ° C, as well as compressed air, supplies Motor-o with a pressure of up to 10 kg / cm at a temperature of up to 100 ° C, and to maintain a high fuel utilization ratio (about 0.88 ... 0 , 68) the ratio of the masses of the mixture to the mass of the insetting air is equal to 9. This contributes to reliable operation, since the material of the structural elements through which the heating gas is injected into the solution has a temperature up to NO C, which is permissible for long-term work of silicon-iron parts in sulfuric acid solutions of the indicated concentration. When using an injecting gas such as compressed air at 50-1OO C, a pressure of 1 kgf / cm and maintaining a heating gas temperature of 400 C, the fuel utilization ratio varies from 0.63 to 0.25 with an increase in the solution temperature from 50 to 70 C. At the same time, the ratio of the mass of the mixture to the mass of the injecting gas (air) will be 2. The work in these modes ensures the reliability of the equipment, the maximum temperature of which corresponds to 110 ° C (the temperature of 260 ° C in a known way and also provides a viewpoint of economical operation). , which contributes to an increase in the efficiency of processing, the invention can be used in mechanical engineering and power engineering during the heating of aggressive solutions during the chemical treatment of rolled metal and other metal products.The formula was invented 1. The method of immersed gas heating of the solution by heat transfer during contact With a heat-transfer gas obtained by burning a fuel, characterized in that, in order to increase the efficiency of the process, the heat-transfer gas is pre-mixed with a part of the gases leaving the solution, The resulting mixture is injected with compressed gas at a pressure of 1-10 kgf / cm, while the ratio of the mass of the mixture to the mass of the injecting gas is set to 2: 9.

2. Method pop. 1, characterized in that compressed air at 50-100 C is taken as the injecting gas. Injection sources taken into account during this test: 1. Copyright certificate No. 498366, l. C 23G 3/04, 1974.,. Г .. Luk nchikov A. S. Immersed gas heating of liquids and melts, Kiev, Technique. 1965, p. 23-27