Vapor phase cleaning system and method of propellant storage tank

Abstract

The invention discloses a vapor phase cleaning system of a propellant storage tank. The vapor phase cleaning system comprises a cleaning agent storage tank used for storing a cleaning agent, a cleaning agent steam generation device, a conveying device and a cooling system, wherein the input end of the conveying device is connected with the cleaning agent storage tank; the output end of the conveying device is connected with the cleaning agent steam generation device; the output end of the cleaning agent steam generation device is connected with the propellant storage tank; and the propellant storage tank is provided with the cooling system used for cooling steam of the cleaning agent. The vapor phase cleaning system is applicable to the propellant storage tank, can be automatically controlled, and is safe and reliable; the cleaning agent is small is dosage and can be repeatedly utilized multiple times, and cost is reduced; and in the propellant storage tank, the dissolution effect of the vaporous cleaning agent is combined with the flushing effect of the liquid cleaning agent, so that the propellant storage tank is cleaned more completely, and the cleaning effect is better.

Description

technical field [0001] The invention belongs to the cleaning field, and in particular relates to a vapor phase cleaning system and method for a propellant storage tank. Background technique [0002] In the aerospace industry, propellants are essential, such as hydrazine (unsymmetrical dimethylhydrazine, anhydrous hydrazine, monomethylhydrazine) fuels are often used as flight power, dinitrogen tetroxide, etc. are used as oxidants, hydrazine fuels and Oxidants are stored in corresponding tanks. The volume of the storage tank is huge, for example, the primary volume is about 70m 3 , the second level is about 20m 3 At the same time, the structure of the storage tank is complex, and there are complex structures such as anti-sway plates, corner pieces, pull wires, and welds in the tank. Generally, after the propellant injected leaks out, a certain amount of propellant and corrosion products remain on the inner wall and internal structure of the tank. , Long-term use will also p...

AI Technical Summary

Problems solved by technology

At first, acetic acid and sodium carbonate solutions were used, but such cleaning solutions are easy to crystallize and form residues, which affects the cleaning quality. Therefore, a large amount of distilled water is required for cleaning, and after cleaning, the cleanliness of the inner wall after cleaning needs to be manually checked, and the operation is more dangerous. high

In addition, the residual water after cleaning the tank has the characteristics of high boiling point, high specific heat and heat of vaporization, and is not easy to dry completely; the residual water is easy to combine with the residual dinitrogen tetroxide in the oxidant tank to form dilute nitric acid, which is harmful to the tank. The material produces serious corrosion, which affects the life of the product and even creates hidden dangers of accidents

[0004] Therefore, technicians have developed a special cleaning agent for cleaning the propellant tank, which has no violent chemical reaction with hydrazines or dinitrogen tetroxide, and can be miscible, which improves the safety, but there are still defects in this method : On the one hand, the amount of special cleaning liquid is large, the cost is high, and the follow-up treatment is difficult and time-consuming;

Although this technology adopts a fully sealed structure and realizes a fully automatic cleaning process, it still uses soaking, so the amount of cleaning liquid is large, the cost is high, the follow-up treatment is difficult and takes a long time, and it is difficult to completely clean the microstructure inside the storage tank. Clean, strong adhesion, incomplete cleaning

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