Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
  • F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure-reducing chambers, e.g. in accumulators
  • F22B3/045—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure-reducing chambers, e.g. in accumulators the drop in pressure being achieved by compressors, e.g. with steam jet pumps
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D1/00—Evaporating
  • B01D1/28—Evaporating with vapour compression
  • B01D1/284—Special features relating to the compressed vapour
  • B01D1/2856—The compressed vapour is used for heating a reboiler or a heat exchanger outside an evaporator
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D1/00—Evaporating
  • B01D1/28—Evaporating with vapour compression
  • B01D1/2884—Multiple effect compression
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S203/00—Distillation: processes, separatory
  • Y10S203/08—Waste heat
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S203/00—Distillation: processes, separatory
  • Y10S203/21—Acrylic acid or ester

Definitions

• the invention relates to a process plant which has at least one evaporator for a process liquid, a condenser connected downstream thereof and a vacuum pump, in which plants the process liquid evaporates in the evaporator under vacuum and the vapors via a suction line connected to the evaporator are led through the condenser to the vacuum pump.
• the vapors sucked out of the evaporator boiler by the vacuum pump are cooled in the condenser, so that the size of the downstream vacuum pump can be made smaller.
• the condenser requires a large amount of cooling water to cool the vapors. Most of the heating energy previously supplied to the evaporator is thus released into the environment via the cooling water.
• the object of the invention is to redesign a process plant of the generic type with as little installation effort as possible while continuing to use the existing plant parts in such a way that the heat utilization is significantly improved.
• the object is achieved according to the invention in that a gas ring compressor which presses the vapors through the condenser is connected into the suction line between the evaporator and the condenser, and that process liquid is also passed through the condenser as a cooling liquid, heated in the condenser and then in the evaporator is fed.
• a gas ring compressor works oil-free, so that there is no risk of contamination for the vapors being pumped.
• a higher pressure ratio can be economically achieved with a gas ring compressor, as a result of which the vapor is heated correspondingly more strongly.
• a larger heat difference is thus present at the condenser, so that a larger amount of heat is transferred to the process liquid flowing through the condenser.
• the evaporator therefore requires considerably less additional heating energy to evaporate the process liquid. In most cases, the heating of the process liquid by the condenser is sufficient to keep the process going. This contributes to the further improvement of the economy of the plant. Since the use of a gas ring compressor has significantly increased the cost-effectiveness and operational safety, it is particularly worthwhile to retrofit smaller process plants with outputs below 500 kW.
• the process liquid is expediently pumped through the condenser by means of a circulation pump. If a heat exchanger is assigned to the vacuum pump used in the system, the amount of heat recovered can be increased further by the process liquid being passed through the circulation pump via the heat exchanger assigned to the vacuum pump.
• the retrofitting of a process system is made considerably easier in that the gas ring compressor and the vacuum pump are arranged on a common box frame, on which the external pipe connections required for the connection of the gas ring compressor and the condenser are also provided.
• the steam usually obtained in process plants can be used by the fact that the gas compressor is driven by a steam turbine.
• 1 shows a process plant according to the prior art
• 2 shows a process plant redesigned according to the invention.
• 1 denotes an evaporator into which a process liquid 2 to be evaporated is filled. If the process to be carried out is a batch operation, process liquid 2 is filled into the evaporator 1 only once at the beginning of the process. In another operating mode, new process liquid 2 may be continuously fed into the evaporator 1 during the process. Batch operation is assumed in the system shown in FIG.
• the process liquid 2 is heated and thereby evaporated.
• a vacuum is created in the evaporator 1 by a vacuum pump 5 arranged in the suction line 4, so that the evaporation of the process liquid 2 takes place even at a relatively low temperature.
• the suction line 4 is led to the vacuum pump 5 via a condenser 6 provided with a cooling coil 7.
• the vapor drawn off from the evaporator 1 is thus cooled by the cooling water flowing through the condenser 6. Since a reduction in volume is associated with the cooling of the vapor, the vacuum pump 5 has a smaller size than if it was connected directly to the evaporator 1 without a condenser 6.
• the vacuum pump 5 which can be a liquid ring pump, is assigned a heat exchanger 8, which is also provided with a cooling layer 9 through which cooling water flows.
• FIG. 2 now shows a system which has been redesigned according to the invention, in which the heat generated in the process is no longer dissipated to the environment via cooling water, but is used in the process to heat the process liquid 2.
• the parts corresponding to the system according to FIG. 1 are provided with the same reference numerals as in FIG. 1.
• a gas ring compressor 11 is connected into the suction line 4 between the evaporator 1 and the condenser 6. This compressor 11 compresses the vapors sucked out of the evaporator 1, the latter being heated.
• the use of a gas ring compressor 11 is particularly advantageous since, because of the higher pressure ratio that can be economically achieved with such compressors 11, the vapor is heated to a greater extent.
• the vapor is then pressed by the gas ring compressor 11 through the condenser 6, through the cooling coil 7 of which process liquid 2 is now pumped by means of a circulation pump 12.
• the process liquid 2 extracts heat from the vapor, so that the desired volume reduction of the vapor is again achieved by cooling.
• the heat extracted from the vapor is no longer released into the environment, but remains in the process due to the recycling of the process liquid 2 from the condenser 6 into the evaporator 1.
• the cooling coil 9 of the heat exchanger 8 is also connected in parallel with the cooling coil 7 of the condenser 6.
• the waste heat generated during the cooling of the vacuum pump 5 thus also serves to heat up the process liquid 2. In the case of a system redesigned in this way, heating of the process liquid from the outside is generally not necessary even for starting the process.
• the installation of the gas ring compressor 11 is only required for the redesign of the system.
• the circulation pump 12 is only required if the liquid throughput due to natural gravity in the circumstances of the existing system does not result in sufficient heat exchange.
• Umisselz ⁇ pump 12 With a Umicalz ⁇ pump 12, however, the economy of the system can be improved in any case, since a larger amount of heat is exchanged due to the higher liquid throughput.
• the piping of an existing system can largely be retained. It is only necessary to supplement the connection of the compressor 11 and the circulation pump 12 and for the connection of the evaporator 1 to the cooling coils 7 and 9 of the condenser 6 and the heat exchanger 8.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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ID=6355442

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (16)

Citations (6)

Family Cites Families (6)

• 1989
  • 1989-04-24 US US07/613,881 patent/US5169502A/en not_active Expired - Fee Related
  • 1989-04-24 WO PCT/DE1989/000262 patent/WO1989012201A1/de not_active Ceased
  • 1989-04-24 EP EP89905069A patent/EP0423135B1/de not_active Expired - Lifetime
  • 1989-04-24 JP JP1991600001U patent/JPH0729363Y2/ja not_active Expired - Lifetime
  • 1989-04-24 DE DE8989905069T patent/DE58902718D1/de not_active Expired - Lifetime

Patent Citations (6)

Non-Patent Citations (1)

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