The method of cleaning the inner surface of blood vessels

 

(57) Abstract:

Applications: cleaning of tanks, operated in the interest of special equipment. The inventive method is the impact of pulse pressure on the inner surface of the vessel. At the same time as cleanup tool selected working fluid is liquid nitrogen, partially filled in the vessel after irrigation of its inner surface with liquid nitrogen and purging with gaseous nitrogen. After sealing the vessel, the pressure pulse creates inside it by raising the pressure to a predetermined value by evaporation of liquid nitrogen with subsequent release of pressure by the depressurization of the vessel. 1 C.p. f-crystals, 1 Il.

The invention relates to the purification of vessels operating on the objects of special equipment.

It is known device [1], used to clean tanks by dropping from the drive into the product of the air, forming a shock pulse pressure.

The device requires bulky equipment: compressor, filter your environment, the elements of complex automation for the process.

The closest in technical essence to the proposed method is the method [2] cleaning products soba is not enough quality cleaning cavities, great flow of the working fluid (agent), cumbersome equipment, and a large energy installation.

The aim of the invention is to obtain the required purity of the surface, i.e., improving the quality of cleaning of the vessel without removing the vessel from the object. This goal is achieved by the fact that the cleanup tool is selected liquid nitrogen, i.e., itself the working fluid used in the operation of the vessel, and the pressure in the vessel created by evaporation of liquid nitrogen.

Before the rise of pressure in the vessel to produce irrigation of its inner surface with liquid nitrogen. The surface is cooled, the flight of foreign bodies freezes and becomes solid, shrinks and pulls away from the surface of the vessel.

After irrigation produce blowing nitrogen gas. When this air is displaced from the vessel, more evenly cools the inner wall of the vessel. Part of the debris stream of nitrogen gas exhausted outside.

The vessel is partially filled with liquid nitrogen, pressurized. The evaporation of nitrogen and a pressure rise within him. If necessary, liquid nitrogen is heated.

After reaching a certain excess pressure, gaseous nitrogen dropping the ary wave, followed by a stream of nitrogen gas turbulent character.

The operation of pouring liquid nitrogen and discharge pressure of the vessel again, based on the requirements of the quality of cleaning. The vessels are contaminated in the manufacturing process and during operation they need to clean.

Dismantling titanium vessels with the object of special forces is very difficult, often impossible because it may be associated with the destruction of some unique elements. Therefore, the proposed method of cleaning a vessel without removing it from the object is actually the only way of cleaning it. And of operating conditions, namely titanium vessels entering acids into the internal cavity is unacceptable, and hence as they solvents (acids) is invalid.

The quality of cleaning vessels must be such that the foreign body with its inner surface must be no larger than 10-15 microns, such purity is required nitrogen for control systems of exploitation.

In addition, the proposed method is ideal for cleaning the vessels in the manufacturing process after welding works (welding two halves) and further machining of the inner surface, when inside isolate the proposed method.

The vessel 1 has two necks 2 and 3. Through one of them (or both) to produce irrigation internal surface of the vessel 1 with liquid nitrogen, for example, using a spray gun 4, and then produce the blowdown vessel 1 with gaseous nitrogen or evaporated (by gravity) or from an external source by opening the valves 5 and 6. After that fill part of the vessel with liquid nitrogen 7, overlapping the neck 2 and 3 valves 5 and 6. The evaporation of liquid nitrogen 7 and the rise of pressure inside the vessel 1. Control pressure gauge 8. Periodically opening the valve 6, dropping gaseous nitrogen from the vessel 1. Control the quality of cleaning produce according to the output of the filter 9, first opening the valve 10.

As shown by the experimental results, the use of alcohol by spraying them with the inner surface of the vessel 1 at the beginning and end of the treatment process reduces the consumption of liquid nitrogen is 7 and, consequently, reducing the number of cycles refills.

However, the use of alcohol at the facility operation requires additional measures to comply with the rules of fire and explosion safety.

In pilot plant tests were carried out using this method cleaning is substantial titanium vessels, operated on an aircraft is the impact of pulse pressure agent, characterized in that, to improve the quality of cleaning, as the operating agent use liquid nitrogen, before the rise of pressure in the vessel to produce irrigation of its inner surface with liquid nitrogen and venting of gaseous nitrogen, after which the vessel is partially filled with liquid nitrogen and sealed, and the pressure pulse generated by the pressure rise to a predetermined value by evaporation of liquid nitrogen inside the vessel with the subsequent release of pressure, and the amount of nitrogen when filling the cleaned vessel is chosen from the condition for creation of multiple pressure pulses.

2. The method according to p. 1, characterized in that, in order to reduce the number of cycles in liquid nitrogen, use of alcohol, by spraying them with the inner surface at the beginning and end of the treatment process.

 

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