Multistage evaporator

The multistage evaporator comprising an evaporator section including a plurality of evaporating stages;

• a vapor compressor connected to the evaporator section;
• a heat pump connected to the evaporator section;
• the vapor compressor being a mechanical compressor;
• and further comprising a thermal engine connected to the mechanical compressor for driving the same and for expanding steam to the level of the steam leaving the mechanical compressor.

The multistage evaporator comprising an evaporator section including a plurality of evaporating stages;

• a vapor compressor connected to the evaporator section;
• a heat pump connected to the evaporator section;
• and wherein the evaporator section further comprises a heat input;
• a condensate output;
• a vapor output;
• wherein the vapor compressor further comprises a source of steam;
• a steam jet injector connected to the source of steam for providing steam power and to the heat input of the evaporator section;
• a distributor valve connected to an input of the steam jet injector;
• wherein the heat pump further comprises an absorber connected to the condensate output of the evaporator and to the heat input of the evaporator on its output side, and to a port of the distributor valve;
• a heat exchanger connected via a saturation line and a depletion line to the absorber;
• a pressure reducing valve connected via the heat exchanger to the saturation line;
• a boiler connected to the pressure reducing valve to receive feed and having an output for depleted mixture;
• a pump connected to the output for depleted mixture of the boiler and to the depletion line of the absorber via the heat exchanger;
• a condenser connected to the boiler;
• and a control valve connected to the distributor valve and to the boiler heating provision for controlling the amounts of vapors required in the absorber and the boiler heating supply.

A method for multiple stage evaporating comprising

• compressing part of the exhaust vapor to provide process steam with a vapor compressor;
• pumping another part of the exhaust vapor of the evaporator with a heat pump for production of process steam;
• feeding process steam to the first stage of a multiple stage evaporator;
• and
• returning part of the cooled process steam to the heat pump.

The method for multiple stage evaporating comprising compressing part of the exhaust vapor to provide process steam with a vapor compressor;

• pumping another part of the exhaust vapor of the evaporator with a heat pump for production of process steam;
• feeding process steam to the first stage of a multiple stage evaporator;
• returning part of the cooled process steam to the heat pump, feeding steam under high pressure as booster steam via a by-pass line to a steam jet injector serving as a vapor compressor to provide process steam;
• reducing additional high pressure steam to process steam through a throttle and water injection;
• and feeding the process steam to the first evaporating stage.

The method for multiple stage evaporating comprising compressing part of the exhaust vapor to provide process steam with a vapor compressor;

• pumping another part of the exhaust vapor of the evaporator with a heat pump for production of process steam;
• feeding process steam to the first stage of a multiple stage evaporator;
• returning part of the cooled process steam to the heat pump, expanding steam to the level of the steam resulting from the compressor via a thermal engine;
• and driving a compressor providing the compressing with power provided by the thermal engine.

The method for multiple stage evaporating comprising compressing part of the exhaust vapor to provide process steam with a vapor compressor;

• pumping another part of the exhaust vapor of the evaporator with a heat pump for production of process steam;
• feeding process steam to the first stage of a multiple stage evaporator;
• returning part of the cooled process steam to the heat pump, feeding vapor from the evaporating stages to an absorber containing an unsaturated multicomponent mixture;
• and absorbing the vapor with the multicomponent mixture.

The method for multiple stage evaporating comprising compressing part of the exhaust vapor to provide process steam with a vapor compressor;

• pumping another part of the exhaust vapor of the evaporator with a heat pump for production of process steam;
• feeding process steam to the first stage of a multiple stage evaporator;
• returning part of the cooled process steam to the heat pump, feeding back vapors intended for the heat pump to a boiler stage and an evaporating stage;
• vaporizing in the boiler stage at a low pressure low boiling components of a multicomponent mixture;
• liquefying the low boiling components in a condenser;
• pumping the liquefied low boiling components with a pump into the evaporating stage being under higher pressure;
• vaporizing the low boiling components again by contact with the vapors;
• absorbing thereupon in an absorption stage the low boiling component vapors in a depleted multicomponent mixture under generation of heat;
• throttling the now saturated multicomponent mixture in a throttle connected to the absorber to a pressure corresponding to that of a boiler stage;
• feeding the throttled saturated multicomponent mixture to the boiler;
• removing depleted multicomponent mixture from the boiler;
• pumping the depleted multicomponent mixture back to the absorber standing under a higher pressure, whereupon the saturated and the depleted mixture are heat contacted at the higher pressure as under the higher pressure standing liquid low boiling components with the vaporized low boiling components after the boiling step.