RU2169282C1 - Procedure to liquidate solid fuel charge - Google Patents

Abstract

FIELD: destruction of defective charge located in body of rocket engine. SUBSTANCE: procedure to liquidate solid fuel charge located in body of rocket engine consists in burning of charge with use of solidified water-and-helium cooling agent. Cooling agent is placed in duct of charge and additional liquid cooling agent is supplied into combustion zone after initiation of charge. EFFECT: improved control over burning up of solid fuel charge, possibility to utilize inexpensive cleaning systems of low power while burning up large-sized charges. 3 cl, 1 dwg

Description

 The invention relates to rocket technology and can be used to eliminate charges of solid rocket fuel.

 Currently, there are known methods of eliminating solid propellant charges based on blasting, cutting, dissolving and burning [1,2,3,4]. However, all these methods have fundamental shortcomings: they are either extremely expensive or cause great environmental damage.

 As a prototype, a method for eliminating TPT charges [5] by the method of delayed charge burning in a case filled with a cured aqueous gel composition is considered.

 The disadvantages of this method include the fact that the amount of water-gel composition used may not be enough to realize a reduced consumption of combustion products during the entire time of combustion due to the limited free volume of the body. In addition, it is impossible to regulate the arrival of combustion products during the combustion process, which is especially important for defective charges.

 An object of the invention is to eliminate the disadvantages of analogues, a prototype and the creation of an adjustable method of burning charges of solid fuel, limiting the consumption of combustion products and allowing the use of low-cost cleaning systems of small power when burning large charges, including defective ones.

 The problem is solved in that the charge channel of the TRT placed in the solid propellant rocket housing is filled with a water-gel composition, solidified, and then a charge is ignited, after which additional liquid refrigerant (water) is injected into the combustion zone to control the flow of combustion products.

 The application of this method in an industrial technological system for the elimination of solid fuel charges is shown in the drawing. The charge channel (5) in the housing (4) is filled with a water-gel refrigerant (6), this refrigerant is solidified and the solid propellant thus prepared is installed horizontally on the bench. After ignition of the charge inside the combustion chamber through pipelines (7 or 8) from the tank (1) serves additional liquid refrigerant to control the flow of combustion products using a manual or automatic controller (2) and device (3) for supplying this refrigerant. The pressure in the combustion chamber, which determines the flow rate, is maintained by regulating the supply of liquid refrigerant and is recorded by a pressure sensor (9) at a level of about 0.1-0.2 MPa, which ensures the highest possible explosion safety when burning air-conditioned and defective charges, because the probability of an explosion at low pressures becomes almost zero. The combustion products are fed to the purification device (10), and then emitted into the atmosphere.

 Automatic or manual control of the amount of additional liquid refrigerant and, accordingly, the specified flow rate of the combustion products allows you to programmatically burn complex charges. In this second consumption of combustion products due to the supply of additional liquid refrigerant is reduced several times in comparison with the prototype. In the event of charge attenuation, it can be re-ignited and the combustion process continued.

 In some cases, to simplify and reduce the cost of the liquidation process, instead of a water-gel refrigerant, any inert reservation composition can be used.

 In order to improve the cleaning of the combustion products, a neutralizer of harmful components of the combustion products is added to the additional liquid refrigerant.

 To verify the proposed method, experiments were conducted on the combustion of charges of mixed solid fuel weighing 50 kg. In the 1st case, a charge was burned with a channel filled with a water-gel composition. When this charge was burned, steady burning occurred for 20 minutes. In the 2nd case, a defective charge was burned with a channel filled with water. When burning this charge, the burning time increased by 4 times. The obtained results confirmed the possibility of regulating the combustion parameters of the charge of solid fuel and ensuring a given flow rate of combustion products.

Thus, the method has the following advantages:
1. The opportunity arises a) to save the case and bench equipment from destruction during long-term burning of the charge; b) re-ignition during charge attenuation; c) burn the charge in a horizontal position.

 2. If there are latent defects in the charge, an additional liquid refrigerant can significantly reduce the arrival of combustion products and the rise in pressure from ignition of these defects.

 3. The amount of liquid refrigerant required for flow control during combustion is not limited.

 4. The use of an inert reservation composition as a water-gel composition is economically advantageous.

 5. By reducing the consumption of combustion products during combustion, cleaning devices of low power can be used.

 The method can be industrially used in the elimination of charges of solid rocket fuel, including defective ones.

Literature
1. L.A. Smirnov, O.V. Tinkov. "Conversion". Part IV TSNIINT IKPK, 1996

 2. "Installation for the disposal of TPT charges", patent 2087804, priority from 02.21.95 - analogue.

 3. "Bench installation", patent 2045675, priority from 08/18/93 - analogue.

 4. "Method for the elimination of charges TRT", patent 2021560, priority from 04.15.93. - analogue.

 5. "Method for the elimination of charges TRT", patent 2123991, priority from 10/15/97 - prototype.

Claims (4)

 1. The method of eliminating the charge of solid rocket fuel, including defective, placed in the housing of the rocket engine, which consists in burning the charge using a cured water-gel refrigerant, characterized in that this refrigerant is placed in the charge channel and after ignition of the charge in the combustion zone additional liquid refrigerant.  2. The method according to p. 1, characterized in that the amount of additional liquid refrigerant is regulated during the combustion process, depending on the readings of the pressure sensor in the combustion chamber and the given flow rate of the combustion products.  3. The method according to claim 1, characterized in that instead of a cured water-gel refrigerant, any inert reservation composition is used.  4. The method according to claim 1, characterized in that a neutralizer of harmful components of the combustion products is added to the additional liquid refrigerant.