The cryogenic liquid vaporizer

 

The evaporator cryogenic liquid consists of a body with feeders and delivery of refrigerant containing chamber, the liquid and gaseous refrigerant, the heat transfer element and bulk packing. Heat exchange element is made in the form of a tube bundle, the tube space which contains the bulk head. The node issuing the refrigerant is made in the form of a Central tube with ejector. Receiving chamber of the ejector in communication with the annular space, and a nozzle with camera gaseous refrigerant. Site feed contains refrigerant pipe forming with the outer wall of the Central pipe a ring cavity communicated with the chamber of the liquid refrigerant. The evaporator contains a receiving chamber exhaust refrigerant, communicated through an annulus with the receiving chamber of the ejector. The nozzle of the ejector can be installed with the possibility of vertical movement. The use of the invention will improve the efficiency of the evaporator by reducing energy consumption for evaporation and control of flow rate and temperature of the vapor of the cryogenic fluid at the outlet of the evaporator. 1 C.p. f-crystals, 3 ill.

The invention relates to cryogenic equipment, namely, to evaporate the document [and.with. The USSR №1076693, F 17 9/02, 1982], containing insulated cryogenic tank with the inner and outer shells. The evaporator cryogenic gasifier is a closed path in which serially connected coil that is wrapped around the inner shell, with working ejector nozzle, mixing chamber and diffuser and compressor. The output of the compressor is connected to the coil and the mixing chamber of the ejector. Closed loop contains two throttle valve. In a closed loop through the throttle valves of the injected fluid, which is drawn in by the compressor. In the compressor, the coolant is compressed with increasing temperature and is supplied to the coil. Due to heat transfer between the coil and the wall of the inner shell of bioproduct in cryogenic tank is heated and rapidly evaporates. The cooled coolant is supplied to the ejector, is heated by mixing it with a portion of the coolant flow after the compressor is directed into the mixing chamber and through the diffuser at the entrance to the compressor.

The disadvantages of cryogenic gasifier is the additional energy consumption for the evaporation of the cryogenic product, the inability to control the temperature of the vapor of the evaporated bioproduct, the complexity of some of the liquid [and.with. The USSR №1275182, F 17 9/02, 1985], adopted for the prototype. The evaporator includes a housing with input and output distribution devices placed inside the primary heat exchange element in the form of regular packing with channels for the flow of cryogenic fluid and an additional heat exchanger element with a bulk nozzle mounted behind the primary heat transfer element along the flow of the cryogenic fluid.

Cryogenic liquid flows through the inlet (bottom) of the distribution device in the case of the evaporator, where the heat exchange element is a complete evaporation of the cryogenic liquid in the film boiling regime. Additional heat exchanger element is designed for droplet evaporation, preserved in the stream, their separation (return to the evaporation zone and maintain a given pressure difference between the evaporation zone and the outlet of the evaporator.

Evaporator design does not allow to regulate the flow rate and the temperature of the gaseous product leaving the machine.

The aim of the invention is to increase the efficiency of the evaporator by reducing energy consumption for evaporation of a cryogenic fluid and controlling the flow and temperature of the vapor of the cryogenic fluid at the exit from and the designs are in the form of a tube bundle, annulus which contains the bulk head, the node issuing the refrigerant is made in the form of a Central tube with ejector, suction chamber which is in communication with the annular space, and a nozzle with camera refrigerant gas, the supply node of the refrigerant contains a nozzle, forming with the outer wall of the Central pipe a ring cavity communicated with the chamber of the liquid refrigerant, the evaporator has a receiving chamber exhaust refrigerant, communicated through an annulus with the receiving chamber of the ejector. In addition, the nozzle of the ejector is installed with the possibility of vertical movement.

In Fig.1 shows a longitudinal section of the proposed evaporator cryogenic liquid; Fig.2 is a cross section a-a of the evaporator of Fig.3 - remote element B in Fig.1.

The evaporator includes a housing 1 with a pipe 2 (see Fig.2) input the exhaust vapor of the cryogenic fluid and the pipe 3 to regulate the flow of vapor of the cryogenic fluid. The node supplying a cryogenic fluid 4 consists of a chamber of liquid refrigerant 5, is in communication with the annular cavity 6 formed by the Central tube 7 and coaxially located her pipe 8. The flow of cryogenic fluid through patrov the form of a tube bundle. Annulus of the heat transfer element is filled with a bulk nozzle 14, such as steel balls. Luggage refrigerant gas 15 through the pipe 16 is connected to the nozzle 17 of the ejector 18. The nozzle 17 has the ability to move by means of a screw 19 along the axis of the evaporator to adjust the ejector. From the camera gaseous refrigerant 15 leaves the nozzle 20 for regulating the temperature of the vapor of the cryogenic fluid. The node issuing the refrigerant 21 consists of a Central pipe 7, to the upper edge of which is attached to the diffuser 22 of the ejector 18, and the pipe 8 is connected with the confuser 23 of the ejector 18. Heat exchange element 13 has the insulation 24, which forms a receiving chamber 25 of the ejector 18 and with the inner side of the housing 1 an annular gap 26. In the lower part of the evaporator is placed receiving chamber exhaust refrigerant 27, through which the pipe 2 is served warm exhaust the refrigerant and to regulate the flow from the evaporator is installed a valve on the pipe 3.

The evaporator operates as follows.

Cryogenic liquid such as liquid nitrogen, is passed through pipe 9 through the annular cavity 6 and the chamber of liquid refrigerant 5 in tube heat exchanger element 13, where there is complete evaporation of cryogenic W is 18. The nozzle 20 at the initial inclusion of the evaporator is fully closed. A pair of cryogenic liquid from the nozzle 17 pick up the gas (at the initial moment of time the air from the receiving chamber 25 of the ejector, mixing with it and cooling it, transport it through the Central tube 7 and then cooling apparatus (not shown). Of the cooling apparatus is heated (used) pair of cryogenic liquid newly admitted to the evaporator through the pipe 2 and the receiving chamber 27 of the spent refrigerant. In the evaporator due to the negative pressure in the inlet chamber 25 to be created by the ejector 18, a pair of chamber 27 pass through the apertures 11 in the cylindrical shell 10, the pour nozzle 14, the holes 12 and are received in the receiving chamber 25 of the ejector 18. Vapors are cooled, giving heat to the bulk of the nozzle 14 and the heat exchange element 13. Cooling occurs through the use of the heat of vaporization of the cryogenic liquid in the annular cavity 6, the camera of the liquid refrigerant 5 and the tubes of the heat exchange element 13. From the chamber 25 is cooled vapors are sent by the ejector 18 in the Central tube 7, where, at the same time mingling and additionally cooled with pairs of cryogenic liquid from the nozzle 17 of the ejector out of the evaporator for cooling is the action scene on it. Opening it, part of the warm vapors through the annular gap 26 is removed from the evaporator, reducing the flow of vapor of the cryogenic fluid from the Central pipe 7. The temperature of the vapor regulating valve in the pipe 20. Depending on the degree of opening of the evaporator is discharged part of the cold vapor, less enters the nozzle of the ejector 18 and, thereby, less cooled vapors coming from the receiving chamber 25 of the ejector. Thus, by adjusting the degree of opening of the valves in the branch pipes 3 and 16, set the desired flow rate and temperature of the vapor of the cryogenic fluid at the evaporator outlet.

The use of the invention allows to reduce the flow of cryogenic fluid for cooling equipment by a partial return of the heated vapor for re-cooling. The cooling of the warm vapors occurs due to the heat of evaporation of the cryogenic liquid. Evaporator design allows you to adjust the flow and temperature of the vapor of the cryogenic fluid at the outlet of the evaporator. The evaporator is simple to manufacture and use.

Claims

1. The evaporator cryogenic liquid, comprising a housing with feeders and issuance of the refrigerant containing timeritem, that heat exchange element is made in the form of a tube bundle, the tube space which contains the bulk head, the node issuing the refrigerant is made in the form of a Central tube with ejector, suction chamber which is in communication with the annular space, and a nozzle with camera refrigerant gas, the supply node of the refrigerant contains a nozzle, forming with the outer wall of the Central pipe a ring cavity communicated with the chamber of the liquid refrigerant, the evaporator has a receiving chamber exhaust refrigerant, communicated through an annulus with the receiving chamber of the ejector.

2. The evaporator cryogenic liquid under item 1, characterized in that the nozzle of the ejector is installed with the possibility of vertical movement.

 

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1 dwg

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