Device for the storage and supply of cryogenic products

 

(57) Abstract:

In the device for storage and supply of cryogenic products pipelines filling and drainage, and the wires from the sensor equipment in the area between the outer and inner shells are localized in one area, enclosed in an additional vacuum-tight envelope. The shell forms with the adjacent portions of the inner and outer shells of the device closed vacuum-tight chamber which is provided with an additional valve vacuum. The use of the invention allow for repairable devices for storage and supply of cryogenic products and to improve the safety of its operation. 1 Il.

The invention relates to cryogenic engineering and is intended for storage and supply of cryogenic products to consumers, for example to supply hydrogen and oxygen stored at cryogenic temperatures, the electrochemical generator (ECG) power plant (power plant) on the basis of hydrogen-oxygen fuel cells, intended for installation on submarines, in addition, it can be used in space technology for the supply of cryogenic products to consumers, set to space the cast elements, designed for use in areas where laying of transmission lines is difficult.

Known decision for a similar device for the storage and supply of hydrogen and oxygen in the ECG EC (see "Plant and system power spacecraft on the basis of hydrogen-oxygen fuel cells", edited by M. C. Melnikova, M., GONTI-4, 1970, S. 43-89).

The device includes a cryogenic storage tanks for hydrogen and oxygen, each of which contains a heat-insulated inner shell located at her sensor apparatus enclosed in a vacuum-tight outer shell installed on it valve vacuum, pipelines filling and drainage, safety and valves.

It is also known a device for the storage and supply of liquid hydrogen, selected as a prototype (see "Questions of deep cooling", a collection of articles edited by M. P. Malkov.- M.: Publishing house of foreign literature, 1961, S. 409-413).

The device comprises a heat-insulated inner jacket with the property in it of sensor equipment enclosed in a vacuum-tight outer shell with the attached klapa the STATCOM and analog prototype is they do not provide maintainability, and therefore, the recovery efficiency of the device with the most probable failure-loss of seal insulating cavity (the cavity between the inner and outer membranes). Cause loss of containment is basically a violation of the integrity of pipelines in the area between the shells of the device. In this area to reduce heat gain through pipelines to perform in a serpentine or corrugated inserts, which increases the length of the heat transfer path. During long-term operation under overload vibration of the coils in their worki in the shell may be compromised integrity, it can also be broken in places worki bellows and electrogeneration, to which are soldered the wires from the sensor apparatus.

Device for the storage and supply of hydrogen and oxygen included in the power plant installed on a submarine, must be operated for 25 years at the overloads of up to 10g, so the probability of loss of containment in the above places is great. To eliminate leakage in these places requires complete disassembly of the device: the dismantling of the outer ONT inconvenient and impractical, because it will take a very long time, and the boat is idle. Therefore, in this case, the device must be replaced, that, first, expensive, and secondly, remove the device from the power compartment of the boat and the new installation also requires a long time.

Another disadvantage of the known devices is that when the loss of tightness of the cavity insulation, and thus the loss of vacuum in it will be rapid increase in the pressure of the stored cryogenic products to the level of the safety valve. If at this time the boat is at the maximum depth of the dive, for example, 300 m, while its ascent may be less than the pressure rise to the level of the safety valve. In this case, the drainage cryogenic product will be produced in the surrounding body of water. When discharging the cryogenic product temperature below the temperature of the water formed icicles can score outboard hole pipeline emergency relief. Under these conditions, the pressure of the cryogenic product may increase above the limit of the calculated level that will lead to an emergency in the power compartment of the boat, i.e., the known device>Rapid increase in the pressure of the cryogenic product is related to the fact that loss of vacuum effective thermal conductivity of the vacuum multilayer insulation increases from 1 to 10-4up to 2 10-1kcal/McGraw (see, N. Napalkov, "Thermal protection of tanks with cryogenic rocket fuel", Handbook, am -1, M, GONTI-4, 1973, Fig. 33), i.e. 2000 times. The total heat gain from the environment to the stored cryogenic product is the sum of the heat gain in thermal bridges (supports, pipes, wires) and leakage through the insulation. When applying vacuum multilayer insulation heat gain by it does not exceed 50% of the total heat input. At this level of leakage through the insulation (50% of total heat gain) loss of vacuum, and hence increase the leakage through the insulation in 2000 the total heat gain increases ~ 1000 times. This increase in heat input will result in a rapid increase of pressure and to the aforementioned consequences.

The present invention is the provision of a device for maintainability storage and supply of cryogenic products and improving the safety of its operation.

The invention consists in that the device is authorized in it of sensor equipment, enclosed in a vacuum-tight outer shell installed on it valve vacuum, pipelines filling and drainage, safety and shut-off valve, the said pipes and wires from the sensor equipment in the area between the outer and inner shells are localized in one area, which is enclosed in an additional vacuum-tight envelope, forming with the adjacent portions of the inner and outer shells closed vacuum-tight chamber which is provided with an additional valve vacuum.

The technical result consists in the fact that, compared with the currently known technical solutions newly created design for maintainability device for the storage and supply of cryogenic products and increases the safety of its operation.

This is achieved by localization in the same area, all pipelines crossing the space between the inner and outer shells and wires from the sensor equipment, the output from the inner to the outer shell using electrogeneration or by positioning them inside a special pipelines and execution of these pipelines, the wire is nutrena and outer shells closed vacuum-tight chamber, equipped with valve vacuum. As a result, the leak tightness of piping, bellows or connectors to resolve the issue will only need to open the top plate of the newly formed vacuum-tight cavity and repair leak, and not to replace the entire device, as in the known technical solutions, which allows for orders to reduce the cost of repair works and their execution time. In addition, the tightness of piping vacuum in the main volume of the cavity insulation is not disturbed. The area of the localized zone is 1-2% of the total area of the inner shell, for example, for a device for the storage and supply of liquid hydrogen in the amount of ~ 1.5 t, installed with remote control submarine, the entire area of the inner shell is 55 m2and the area of the localized zone of 0.8 m2, i.e., ~ 70 times less than the entire area. Therefore, if in the known devices, the heat input to the cryogenic product at a loss of vacuum in the cavity insulation increases, as mentioned above, in 1000, that in the proposed design, the increase in 1000 : 70 = 14.3 times. As a result, in the proposed design speed of the pressure rise bulbine, and drainage cryogenic product will be under control, which will prevent clogging of the outboard holes pipeline emergency relief and to prevent any possible emergency situation when reset, i.e., to increase the safety of operation.

The invention is illustrated in the drawing, which shows the diagram of a device for the storage and supply of cryogenic products.

The unit contains the inner shell 1, which is applied to vacuum multilayer insulation 2. The inner shell 1 is secured in a vacuum-tight outer shell 3 poles 4. The device is provided with a pipeline refills 5 bellows insert 6 in the area between the membranes and drainage piping 7, which is the area between the shells made in the form of coil 8. The pipes 5, 7 provided with electropneumatically respectively 9, 10. In the inner shell 1 is set to a temperature sensor 11, an internal source of heat such as a heater 12, the sensor number 13. The sensors 11, 13 and the heater 12 through wires 14 connected to electrogenerated 15, welded in the inner shell 1, which is connected by wires 16 with electrogeneration 17, welded to the outside is turned off in the advanced vacuum-tight envelope 18, which with the adjacent portions of the inner and outer shells, respectively, 19, 20 forms a closed vacuum-tight chamber, in which part 19 of the surface of the inner shell 1 is vacuum-deposited multilayer insulation 21. The outer casing 2 has a main vacuum valve 22 and optional vacuum valve 23 mounted on the portion 20 of the outer shell 3. The device is equipped with a safety valve 24 and a pressure sensor 25.

The device operates as follows.

Open solenoid valves 9 and 10 and is cooling down, and then filling the cavity of the inner shell 1 of cryogenic products (liquid hydrogen or liquid oxygen). After filling close electroneurography 9, 10, turns on the heater 12 and is a pressure rise to the working level, for example up to 10 kgf/cm2after which the heater 12 is turned off. Selection is made cryogenic product in the ECG. Can be selected as a liquid or vapor phase, which opens the valve 9 or 10. When the pressure is increased when the flow rate is small, shown in the vapor phase, and at a high flow rate pressure drops, and is for selecting otvoditsya maintaining pressure in the selection process specified in the regulated operating range, for example 8-10 kgf/cm2. If during operation will be compromised integrity, such as a bellows 6, it will be a loss of vacuum in a closed vacuum-tight cavity formed by a vacuum-tight shell 18 and sections 19, 20, respectively, the inner and outer shells. As a result, in this local area will be increased heat leakage through the insulation, leading to an unplanned increase in pressure, which is fixed by the pressure sensor 25. The growth rate of the pressure in the proposed device will be much less than in the known devices, because the vacuum will be lost only in a closed additional vacuum-tight cavity, the base area which is the area 19 is not more than 1.5% of the total area of the shell 1, and increased heat leakage through the insulation will be only on this area. The growth pressure to the safety valve, for example, up to 35 kgf/cm2(this level of pressure of the safety valve needed to be reset cryogenic product on any possible depth, for example, 300 m) will be not minutes, as in the known devices, and from 1.5 to 5 hours depending on the amount of cryogenic products the wire reset, that was not his driving, in addition to the discharge of cryogenic product through the pressure relief valve may be arranged to discharge cryogenic product through the pipe 5, which is not possible in immersion conditions. All this increases the safety of operation. To eliminate leakage after removal of the cryogenic product from the cavity of the shell 1 is only necessary to open the top plate 20 additional vacuum-tight cavity, remove the insulation and replace the bellows 6, and not to do a checkout from energootseka failed device for the storage and supply of cryogenic products and installing a new one.

Thus, in comparison with the known technical solutions offered by the device due to the localization in the same area, all pipelines crossing the space between the inner and outer shells and wires from the sensor apparatus, the output from the inner to the outer shell using electrogeneration and execution of these pipelines, wires and connectors in additional vacuum-tight envelope, forming with the adjacent portions of the inner and outer shells closed vacuum-tight chamber equipped with a valve vacuum is amonte and increase the safety of operation of the device and all boats in General.

Device for the storage and supply of cryogenic products containing heat-insulated inner jacket with the property in it of sensor equipment enclosed in a vacuum-tight outer shell installed on it valve vacuum, pipelines filling and drainage, safety valves, characterized in that the said pipes and wires from the sensor equipment in the area between the outer and inner shells are localized in one area, which is enclosed in an additional vacuum-tight envelope, forming with the adjacent portions of the inner and outer shells closed vacuum-tight chamber which is provided with an additional valve vacuum.

 

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