SU924470A1

SU924470A1 - Method of producing refrigeration in cryogenic unit

Info

Publication number: SU924470A1
Application number: SU802991093A
Authority: SU
Inventors: Игорь Константинович Буткевич; Игорь Иванович Кирилов; Виктор Георгиевич Матюхин; Виктор Васильевич Редькин; Виктор Иванович Сухов
Original assignee: Предприятие П/Я А-3605
Priority date: 1980-10-13
Filing date: 1980-10-13
Publication date: 1982-04-30

Description

(54) СПОСОБ ПРОИЗВОДСТВА ХОЛОДА В КРИОГЕННОЙ(54) METHOD FOR PRODUCTION OF COLD IN CRYOGENIC

II

Изобретение относитс к холодильной технике , а именно к способу производства холода в криогенных установках, и может быть применено при создании криогенных установок.The invention relates to refrigeration engineering, in particular to a method for producing cold in cryogenic plants, and can be applied in creating cryogenic plants.

Известен снособ производства холода в криогенной установке.с помощью циркул ционного контура путем сжати газообразного хладагента , охлаждени его пр мого потока обратным с последующим разделением на две части, одну из которых используют дл компенсации необратимых потерь, а другую - адиабатически расшир ют и направл ют потребителю, причем из обратного потока отбирают часть при его минимальной температуре П Недостатком известного способа вл етс его недостаточна термодинамическа эффективность вследствие больших потерь от необратимости процесса теплообмена между пр мым и обратным потоками. Это происходит от того, что не учитьтаетс характер изменени реальнь1х свойств криогента в зависимости от температурного уровн теплового взаимодействи пр мого и обратного потоков между собой. Кроме того, известным спосоУСТАНОВКЕA known method of producing cold in a cryogenic plant. By using a circulation loop by compressing the gaseous refrigerant, cooling its direct flow back with subsequent separation into two parts, one of which is used to compensate for irreversible losses and the other is adiabatically expanded and directed to the consumer. and a part is withdrawn from the return flow at its minimum temperature. The disadvantage of this method is its insufficient thermodynamic efficiency due to large losses from reversibility of the heat exchange process between the forward and reverse flows. This is due to the fact that the nature of the change in the real properties of the cryogen is not taken into account depending on the temperature level of the thermal interaction of the forward and reverse flows between them. In addition, a well-known way to install

j6oM нельз получить чистый хладагент, который выводитс из установки, предназначенной дл его реализации.The j6oM cannot obtain a clean refrigerant that is withdrawn from the plant intended for its implementation.

Цель изобретени - повышение термодинамической эффективности способа производства холода в криогенной установке, а также получение чистого хладагента.The purpose of the invention is to increase the thermodynamic efficiency of the method for producing cold in a cryogenic plant, as well as to obtain a pure refrigerant.

Поставленна цель достигаетс тем, что отобранную часть обратного потока адиабатически сжимают до давлени пр мого потока перед его расширением и смешивают с последним на температурном уровне, соответствуюшем температурному уровню обратного потока после , сжати .This goal is achieved by the fact that the selected part of the return flow is adiabatically compressed to the pressure of the forward flow before its expansion and mixed with the latter at a temperature level corresponding to the temperature level of the return flow after compression.

Отобранную часть обратного потока после ее диабатического сжати нагревают с помощью автономного потока ;и смеишвают с пр мым потоком после его сжати , причем дополнительно осуществл ют ввод в контур автономного потока и вьюод из контура части обратного потока в разных количествах.The selected part of the return flow after its diabatic compression is heated using an autonomous flow, and is mixed with the direct flow after its compression, with the addition of a portion of the return flow in varying amounts into the circuit of the independent flow and the viewpoint.

Claims

The drawing shows a diagram of a cryogenic plant, in which a conventional method is carried out. 39 Cryogenic installation contains a circulating circuit with compressor 1, direct flow 2 of refrigerant, reverse flow 3 refrigerant agent, heat exchanger 4, expander 5, heat exchangers 6 and 7, expander 8, consumer 9 cold, compressor 10 and valve 11. On the output line Parts of the return flow 3 from the compressor 10 are fitted with a valve 12 and a heat exchanger 13. To introduce an autonomous stream 14 into the circulation circuit, the installation contains an additional unit containing a cylinder 15, a gearbox 16, a valve 17, a compressor 18, a gas tank 19, adsorbers 20 and 21 and valve 22. To output the part about The refrigerant flow 3 from the circulation loop uses valve 23, compressor 24, cylinder 25 and valve 26. In the circulation loop, the gaseous refrigerant is stored in compressor 1. The direct flow 2 of gaseous refrigerant is cooled by its return flow 3 in heat exchanger 4, divided into Two parts, one of which is expanded in expander 5 and used to compensate for irreversible losses in heat exchanger 6, and the other is cooled in heat exchangers 6 and 7, expanded adiabatically in expander 8 and sent to cold consumer 9. The return flow 3 of the refrigerant from the cold consumer 9 is also divided into two parts. One part of it goes to cool the direct flow 2: Heat exchangers 7, 6 and 4 and enters the compressor 1. The other part selected at the minimum temperature is adiabatically compressed in the compressor 10 to the pressure of the direct flow 2 before its adiabatic expansion and is mixed with the direct flow 2 at a temperature level corresponding to the temperature level of the return flow 3 after compression, which is achieved by opening the valve 11. When the pure refrigerant is produced in the installation, the valve 11 is closed and the valve 12 is opened. after adi-. Abatic compression is heated in the heat exchanger 13 by an autonomous stream 14 and mixed with the direct stream 2 after it is compressed in the compressor 1. The autonomous stream 14 is introduced into the heat exchanger 13 from the cylinder 15 under the pressure of the Direct stream 2 in the circulation circuit, which is maintained by the gear 16 If it is necessary to completely empty the cylinder 15, the autonomous flow 14 of the refrigerant isiiTa is supplied through the valve 17 by means of a compressor 18. The suction pressure of the compressor 18 is provided by a gas-holder 19. The autonomous flow 14 is cooled in t heat exchanger 13, is cleaned in adsorbers 20 and 21 and is introduced through valve 22 into the circulation circuit. A part of the return flow 3, which is equal in size to the autonomous flow 14, is removed from the circulation loop through the valve 23. This part of the pure refrigerant is compressed in the compressor 24 to a high pressure and transferred to the cylinder 25. The injection of the refrigerant to the cylinder 25 to direct pressure flow 2 is carried out by compressor 1 through valve 26. The use of the proposed method allows to obtain a pure refrigerant in the required amount and significantly increase the thermodynamic efficiency of the cryogenic plant by reducing irreversible Eph teploobmeshshke to 7. In addition, costs are reduced in the installation work as a whole by reducing the unit cost of compression at a reduced temperature level. compression process. Claim 1. A method of producing cold in a cryogenic plant using a circulation loop, by compressing the gaseous refrigerant, cooling its direct flow with a reverse flow, followed by dividing it into two parts, one of which is used to compensate for irreversible losses, and the other is adiabatically expanded and directed a part is taken from the return flow at its minimum temperature, characterized in that, in order to increase the thermodynamic efficiency, the selected part of the return flow abathically compressed to the pressure of the direct flow before its expansion and mixed with the latter at a temperature level corresponding to the temperature level of the reverse flow after compression.

2. The method according to claim 1, wherein, in order to obtain a pure refrigerant, the selected part of the reverse flow after its adiabatic compression is heated using an independent flow and mixed; direct stream after its compression, and additionally carried out the input into the contour of the autonomous stream and output from the contour of the part) of the brotherly stream in equal quantities. Sources of information taken into account in the examination 1. USSR author's certificate №623073, cl. F 25 J 1/00, 1974.