APPLICATION OF DESALINATION TO RENEWABLE ENERGIES INTEGRATED COMPLEX CSP SOLAR - BIOMASS- ORC GENERATION – DESALINATION The present note has the purpose to introduce the Innovative Application of Thermal Desalination within integrated systems to produce electricity and desalinated water for potable use and/or industrial from renewable energy sources only. The Application mainly consists in operating the desalination plant with heat at low thermal content, produced by an organic cycle generator (ORC), powered with hot diathermic oil heated by an hybrid solar thermodynamic (CSP) and biomass waste to energy system. The integrated complex consists essentially of CSP thermodynamic solar field, biomass waste to energy plant with diathermic oil burner, ORC organic cycle generator CHP type (Combined Heat & Power) and MED thermal desalination plant. The biomass energy section has the main purpose to compensate the discontinuity that characterizes the solar systems, in order to allow the continuous operation typical of the thermal Desalination plants. To be noted that as alternative to the biomass , it could be used low grade fuels or wastes of various nature (“Hybrid solar waste to energy and water”). In particular, the MED Desalination Plant can be designed to operate in combination with ORC-CHP generator models available on the market, operating with diathermic oil, with temperatures in/out of 300°C/240°C, and heating of cooling water from 75°C to 95°C (*). Such temperatures and Delta T of the cooling water, and the thermal power available from the ORC generator are perfectly fit to be combined with MED desalination plant of significant capacity. The net electrical efficiency is of 16-17%. The table herein after is for instance of the production of desalinated water (distilled) which can be obtained by MED Plants combined to four different models ORC-CHP, among the most popular, related to the design performances of the MED Plant. The table is referred to three possible reference performance values of the plant (GOR Equivalent) in terms of production related to the heat consumption, for fixed levels of heating water temperatures. The value of "GOR Equivalent "(expressed in Kg of water produced water/kg of steam) can be selected in the range between the values 7 and 9 considered in the table, assumed as convenient for specific applications, and eventually outside of the range (of course the cost of the MED plant directly depends on the design GOR value). In the conventional applications, the selection of the design GOR is mainly based on the cost of steam; in these particular applications, the selection of the design GOR is determined by relating the water and electric energy production and the relevant sales values, with the cost of the plants and in particular of the solar field.   ORC-CHP Models                                                   ORC –CHP Net Power Production (MW)                                                                                          Oil temperature in/out  300°C/240°C                                                                                                                                                                       1              1,8               2,2              3                                                                                                                                                      ORC-CHP  Hot water thermal power  (MW)                                                                                        Water temperature in/out  75°C/95°C (*)                                                                                           4               8                  10               15    MED  Desalination Plant                          DESALINATED WATER PRODUCTION (m3/h) approx.         GOR Equival.(Perfor. Ratio)                                                                                                                                                                                                              7                                                                    42             80                100              150                      8                                                                    50            100               125              170                      9                                                                    54            103               126              189   (*)Indicative values allowed by the manufacturer (different from those shown on the brochure).

Published by roberto scardua, Demont - Commercial Director REGGIANE Desalination Division

APPLICATION OF DESALINATION TO RENEWABLE ENERGIES

INTEGRATED COMPLEX CSP SOLAR - BIOMASS- ORC GENERATION – DESALINATION

The present note has the purpose to introduce the Innovative Application of Thermal Desalination within integrated systems to produce electricity and desalinated water for potable use and/or industrial from renewable energy sources only.

The Application mainly consists in operating the desalination plant with heat at low thermal content, produced by an organic cycle generator (ORC), powered with hot diathermic oil heated by an hybrid solar thermodynamic (CSP) and biomass waste to energy system.

The integrated complex consists essentially of CSP thermodynamic solar field, biomass waste to energy plant with diathermic oil burner, ORC organic cycle generator CHP type (Combined Heat & Power) and MED thermal desalination plant.

The biomass energy section has the main purpose to compensate the discontinuity that characterizes the solar systems, in order to allow the continuous operation typical of the thermal Desalination plants.

To be noted that as alternative to the biomass , it could be used low grade fuels or wastes of various nature (“Hybrid solar waste to energy and water”).

In particular, the MED Desalination Plant can be designed to operate in combination with ORC-CHP generator models available on the market, operating with diathermic oil, with temperatures in/out of 300°C/240°C, and heating of cooling water from 75°C to 95°C (*). Such temperatures and Delta T of the cooling water, and the thermal power available from the ORC generator are perfectly fit to be combined with MED desalination plant of significant capacity. The net electrical efficiency is of 16-17%.

The table herein after is for instance of the production of desalinated water (distilled) which can be obtained by MED Plants combined to four different models ORC-CHP, among the most popular, related to the design performances of the MED Plant.

The table is referred to three possible reference performance values of the plant (GOR Equivalent) in terms of production related to the heat consumption, for fixed levels of heating water temperatures.

The value of "GOR Equivalent "(expressed in Kg of water produced water/kg of steam) can be selected in the range between the values 7 and 9 considered in the table, assumed as convenient for specific applications, and eventually outside of the range (of course the cost of the MED plant directly depends on the design GOR value).

In the conventional applications, the selection of the design GOR is mainly based on the cost of steam; in these particular applications, the selection of the design GOR is determined by relating the water and electric energy production and the relevant sales values, with the cost of the plants and in particular of the solar field.

 

ORC-CHP Models                                                   ORC –CHP Net Power Production (MW)

                                                                                         Oil temperature in/out  300°C/240°C                                                                            

                                                                                          1              1,8               2,2              3

                                                            

                                                                                        ORC-CHP  Hot water thermal power  (MW)

                                                                                       Water temperature in/out  75°C/95°C (*)

                                                                                          4               8                  10               15

 

 MED  Desalination Plant                          DESALINATED WATER PRODUCTION (m3/h) approx.

 

      GOR Equival.(Perfor. Ratio)         

                                                                                                                                                                              

                     7                                                                    42             80                100              150

                     8                                                                    50            100               125              170

                     9                                                                    54            103               126              189

 

(*)Indicative values allowed by the manufacturer (different from those shown on the brochure).