SU1208400A1 - Method of evacuating cryogenic liquid from reservoir - Google Patents

Description

The invention relates to a technique for pumping cryogenic liquid from tanks with compression to high pressure and can be used in gasification installations for pumping gas into high pressure cylinders, production lines or into an oil bearing formation.

The purpose of the invention is to increase efficiency by ensuring the continuity of the fluid supply and simultaneously pumping out from several tanks with one pump.

The drawing shows the device; implements the proposed method.

The device contains empty tanks 1 and 2 connected to tank 1 by lines 3 and 4, and tank 2 by lines — lines 5 and 4j of the piston pair and 7 are directed along line 13 to tank 10. Then the cryogenic liquid turns on pump 6, pumped out in the system by compressing it in the pump, after which, through line 8, the cryogenic liquid is supplied to the consumer through the evaporator 9, where it is gasified; Part of the cryogenic liquid is fed through line 11 to the cooling jacket 7

(About the pump, in which it is evaporated, and through line 13 is directed to the upper part of tank 10. At the same time, valve 12 on line 11 is opened enough to ensure stable operation of the pump with minimum supply of liquid to tank 10.

The leaks generated during the pump operation, along the leakage line 13, are also directed to the upper part of the high pressure tank 6 from the cooling 20 bone Ud in which the jacket 7 is supported, the product delivery line is less pressure than in tanks to the customer from pump 8 on which is 1 and 2, for example, atmospheric pressure, opens valve 22 completely. Throttling the fluid in front of the valve 25 in throttle 12 provides an additional decrease in its temperature and, consequently, better cooling of the cylinder group of the pump. Periodically when filling the tank 10; the evaporator 9, and the additional tank 10, as well as the line 11 connecting the line 4 with the jacket 7, on which the throttle valve 12 is installed, and the line 13 of the leakage of liquid from the pump jacket, connected to the upper part of the tank 10. The ny-part of the tank 10 is connected to the inlet of the pump 6 - with the suction line 4 and line 14. At the junction of lines 3, 14 and 5 with the line 4 a switching device is installed - multi-pass (two-way ) valve 15. Tanks 1 and 2 are equipped with erator -. 16, tank 10 - evaporator 17. Each of the evaporators is located on one of the lines 18 connecting the upper and lower parts of the respective tank or tank and having shut-off valves 19 (for tanks 1 and 2) and 20 (for tank 10), 10 is connected to the atmosphere by line 21, on which valve 22 is installed.

The method is carried out as follows.

Before pumping out of tanks 1 and 2, part of the cryogenic liquid is directed from them into the cooling jacket 7 of the pump, which ensures cooling of the cylindrical group. To do this, the valve 15 is switched to lines 3 and 5, in tanks 1 and 2 they create overpressure using evaporators 16, open the valves 19, and open the valve 12. Those formed in the jacket

thirty

35

40

45

50

55

n, in which further flow of the indicated streams into it is impossible, pumping out from tanks 1 and 2 is stopped and the cryogenic liquid is pumped out from tank 10. To do this in tank 10, press valve 22 to increase the pressure necessary for pump 6 - reohlazkdeni fluid, and then the Hungarian 15 switch with line 3 and 5 on. line 14o Par from the pump jacket 7 and leakage, i.e. uncompressed liquid, while still being directed from the pump into the tank 10. When the tank 10 is empty or when the pressure in it rises to the maximum allowable, pumping out of it is stopped and pumped out again from tanks 1 and 2. If necessary, after the end Pumping out of tanks 1 and 2, new tanks are installed in their place and connected to the system; in the period of such reinstallation, pumps are pumped out of tank 10.

You can also use additional valves to the valve

002

7 pairs are sent via line 13 to tank 10. Then the cryogenic liquid, turning on pump 6, is pumped out in the system by compressing it in the pump, and then through line 8 the cryogenic fluid is supplied to the consumer through evaporator 9, where it is gasified. liquids through line 11 are fed to cooling jacket 7

pump, in which it is evaporated, and through line 13 is directed to the upper part of tank 10. At the same time, valve 12 on line 11 is opened enough to ensure stable operation of the pump with minimal supply of liquid to tank 10.

The leaks generated during the operation of the pump, along the line 13 diversion of leaks are also directed to the upper part

n, in which further flow of the indicated streams into it is impossible, pumping out from tanks 1 and 2 is stopped and the cryogenic liquid is pumped out from tank 10. To do this in tank 10, press valve 22 to increase the pressure necessary for pump 6 - reohlazkdeni fluid, and then the Hungarian 15 switch with line 3 and 5 on. line 14o Par from the pump jacket 7 and leakage, i.e. uncompressed liquid, while still being directed from the pump into the tank 10. When the tank 10 is empty or when the pressure in it rises to the maximum allowable, pumping out of it is stopped and pumped out again from tanks 1 and 2. If necessary, after the end Pumping out of tanks 1 and 2, new tanks are installed in their place and connected to the system; in the period of such reinstallation, pumps are pumped out of tank 10.

You can also use additional valves to the valve

15 parallel to line 3 and 5 connect additional tanks.

Thus, the proposed method eliminates the direction of the uncompressed part of the fluid (cooling fluid and leakage) from the pump back to the emptying reservoir. Combined with the alternation of pumping out of the tank with pumping out of the cryogenic liquid from the additional tank, this ensures any necessary duration of the continuous pumping of the product, compressing it and dispensing it to the consumer, and also removes product losses. If necessary, may. other tanks should be connected (instead of the valley of the first tanks, which is associated with product losses) or topping up the tanks without stopping the pump.

Since the warm product of the shirt and pump leak collection chamber

Compiled by G.Olshanska Editor T.Miteiko Tehred A. Babinets

234/50 Circulation 460 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, -Moscow, Zh-35, Raushsk nab., d.4 / 5

Branch ShSh Patent, Uzhgorod, Proektna St., 4

it does not return to the tank; it is possible to produce simultaneously with one pump. seamy pumping from multiple tanks, i.e. to use the available park of tanks of small capacity with a small flow area of the line for draining the liquid to provide the required pump performance, which will increase the capacity of each of these lines separately. In this case, the supercooling of the fluid in front of the pump is ensured by individually maintaining the required pressure in each tank, which is almost impossible to provide when returning the product to the tank.

In addition, it is possible to pump out tanks that are not designed specifically for work with pumps, i.e. not equipped for injecting streams downstream of the pump. .

Corrector S.Cherni

Claims (1)

METHOD FOR PUMPING CRYOGENIC LIQUID FROM RESERVOIRS, including compression of a liquid in a pump, supplying it to a consumer, and withdrawing an uncompressed portion of a liquid from a pump, characterized in that, in order to increase efficiency by ensuring a continuous supply of liquid and simultaneous pumping from several reservoirs, not the compressed part of the liquid is taken into an additional container, after filling it, the liquid is pumped out by the pump and supplied to the consumer during periods when the liquid is not supplied from the tanks. a ΐ