TECHNOVACUUM

NEW TECHNOLOGY RESEARCH INNOVATION

 		 Vacuum creating systems
based on vacuum hydrocirculating (VHC) units
Jet compression units
for handling of flare, associated petroleum and other low-pressure gases

  
Jet absorbtion gas cleaning units
for removal of hydrocarbons from breathing gases and recovery of oil gases and oil products gases

 		 
Vortex units
for low-temperature separation of gas mixtures

 
Jet devices:
ejectors and injectors of various purpose






Technovacuum Ltd.
(495) 956-76-21
(499) 261-99-98
(499) 267-82-03
Russia, 105082, Moscow
Ul. B.Pochtovaya, 26 "B", build.2		  

VORTEX UNITS
for low-temperature mixture separation

Purpose

Vortex units on basis of vortex tubes are designed for cold generation in order to reduce the overpressure of process gas which is irreversibly lost by throttling. The cold is used for the low-temperature separation of gas mixtures.

Main field of application

  • Extraction of target products from tail gases of chemical, petrochemical and oil refinery productions.
  • Low-temperature separation of natural gas.
  • Sweetening of casing-head gases of crude oil production from higher hydrocarbons and their dewatering.

Layout of vortex unit

1 - heat exchanger
2 - separator
3 - vortex tube




I - inlet gas
II -consumer gas
III - condensate

Principle of operation of vortex unit

The inlet gas (I) enters a recuperation heat exchanger 1, where it is cooled by a cold stream going out from vortex tube 3. The temperature reduction of inlet gas in the heat exchanger 1 results in condensation of vapors contained in this gas with formation of a condensate, which is separated from the gas in the separator 2. Further this gas is delivered to the inlet of vortex tube 3, where its expansion occurs with simultaneous vortex and separation in two flows - a cold and a hot (Ranque-Hilsh effect). A cold flow is directed to the heat exchanger 1, after which it is mixed with a hot flow. The mixed flow (II) is directed to downstream operation.

There are possible other process flowsheets of vortex units, e.g., cascade, and also a circuit (by a small pressure difference) containing of one three-flow vortex tube combining processes of gas cooling and separation of liquid generated.

Basic advantages of vortex tubes:

  • Significantly greater cooling duty in comparison with ordinary throttling;
  • Structural simplicity, compactness, operating safety and reliability in comparison with turboexpander;
    Vortex unit for removal of higher hydrocarbons and sulfides from oil gas (Orenburg)
  • Possibility of operation on gases containing liquid and solid admixtures;
  • Operation in regime of a control valve; automatic adjusting of flow ratio;
  • Relatively low capital costs.

Experience of industrial application

  • Vortex tube (flow up to 50 000 nm3/h) with variable geometry of jet entry within the cooling station at gas-distributing station of Orenburg (1993);
  • Three-flow vortex unit for removal of heavy hydrocarbons of casing-head gas of crude oil production (Orenburg, Serviceneftegas, Nagumanovo field, 1998);
  • Vortex units in chemical production for extraction of valued components from purge gases of methanol production (Novomoscowsk Azot OJSC, 1998; Severodonetsk GPP 'Objedinenije Azot', 2002) and of tail gases of butyl alcohols production (Sibur-Khimprom OJSC, 2003).

 


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