Discrete constant pressure staging of solid-vapor compound reactors

• US 5,079,928 A
• Filed: 06/07/1991
• Issued: 01/14/1992
• Est. Priority Date: 07/07/1989
• Status: Expired due to Term

• Current Assignee: Rocky Research (Honeywell International Inc.)
• Original Assignee: Rocky Research (Honeywell International Inc.)
• Inventors: Rockenfeller, Uwe, Kirol, Lance D.
• Primary Examiner(s): Bennett, Henry A.
• Assistant Examiner(s): SOLLECITO, JOHN M
• Application Number:
  US07/712,081
• Time in Patent Office: 221 Days
• Field of Search: 62/480, 62/106, 62/112, 165/104.12
• US Class Current: 62/106
• CPC Class Codes: F25B 17/083 with two or more boiler-sorbers operating alternately
• CPC Class Codes: Y02A 30/27 Relating to heating, ventilation or air conditioning [HVAC] technologies
• CPC Class Codes: Y02B 30/00 Energy efficient heating, ventilation or air conditioning [HVAC]
• CPC Class Codes: Y02B 30/62 Absorption based systems

Abstract

A method of transferring and recovering energy comprises placing in different reactors two or more different solid adsorbents having a gaseous reactant adsorbed thereon and each having a different gaseous reactant vapor pressure, in a first reaction cycle, pressurizing a first portion of the reactors at a first pressure to desorb the gaseous reactant in an endothermic reaction, and pressurizing a second portion of the reactors at a second pressure to adsorb the gaseous reactant in an exothermic reaction, and in a second reaction cycle, pressurizing the first portion of the reactors at the second pressure to adsorb the gaseous reactant in an exothermic reaction, and pressurizing the second portion of the reactors at the first pressure to desorb the gaseous reactant in an endothermic reaction, and directing at least a portion of the heat released during the exothermic reactions or at least a portion of heat adsorbed during the endothermic reactions to heat exchange means for energy recovery.

The invention includes apparatus having means for carrying out the process.

Claims

1. A method of staging solid-vapor compound reactions comprising:

selecting a plurality of two or more different compounds comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, wherein each of said compounds has a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant,

locating a different one of said compounds in a different one of a plurality reactors,

in a first reaction cycle, operating a first portion of said reactors at a temperature resulting in a first pressure, whereby said compound therein desorbs said gaseous reactant in an endothermic reaction, and operating said second portion of said reactors at a second pressure whereby said compound therein adsorbs said gaseous reactant in an exothermic reaction, and

in a second reaction cycle, operating said first portion of said reactors at said second pressure whereby said compound therein adsorbs said gaseous reactant in an exothermic reaction, and operating said second portion of said reactors at a temperature resulting in said first pressure whereby said compound therein desorbs said gaseous reactant in an endothermic reaction, and

directing gaseous reactant released from said desorbing reactors to a single condensing means for said gaseous reactant, directing condensed gaseous reactant from said single condensing means to a single evaporating means said gaseous reactant, and directing evaporated gaseous reactant from said single evaporating means to adsorbing reactors.

2. The method of claim 1 wherein at least a portion of said heat from an exothermic adsorption reaction is directed to a reactor for heating compounds therein for driving an endothermic desorption reaction.

3. The method of claim 1 including recovering heat from the gaseous reactant condensation.

4. The method of claim 1 including absorbing heat from evaporation of the condensed gaseous reactant.

5. The method of claim 1 wherein external heat is directed to a first reactor of said first portion of reactors in said first cycle for driving an endothermic reaction therein.

6. The method of claim 1 including directing at least a portion of the heat released during said exothermic reactions or at least a portion of the heat absorbed during said endothermic reactions to heat exchange means for energy recovery.

7. The method of claim 1 wherein said gaseous reactant is selected from the group consisting of ammonia, water, carbon dioxide, sulfur dioxide, lower alkanol, alkylamine, polyamine and phosphine.

8. The method of claim 7 wherein said solid reactant is a metal oxide, halide, carbonate, nitrate, nitrite, sulfate, oxalate or sulfide.

9. The method of claim 8 wherein the metal of said inorganic salt is selected from the group consisting of alkali metal, alkaline earth metal, transition metal, aluminum, zinc, cadmium, and tin.

10. The method of claim 8 wherein said solid reactant comprises a double metal chloride, said metals selected from the group consisting of an alkali metal, alkaline earth metal, aluminum, manganese, iron, nickel and cobalt.

11. The method of claim 9 wherein said gaseous reactant is ammonia and said solid reactant is a halide of said metal.

12. The method of claim 1 compromising selecting a plurality of three or more different compounds and locating a different one of said compounds in a different one of three or more different reactors.

13. The method of claim 12 wherein each of said compounds absorb and desorb the same gaseous reactant at different temperature, respectively, at said reaction pressure, and wherein, said plurality of compounds selected are placed in successive reactors in successive ascending order of gas vapor pressure.

14. The method of claim 13 wherein said compounds are selected such that the adsorption temperature of a lower vapor pressure compound at a low reaction pressure, is higher than the desorption temperature of a successive higher vapor pressure compound at a high reaction pressure.

15. The method of claim 14 wherein said first pressure is higher then said second pressure.

16. The method of claim 15 wherein at least a portion of the heat from an exothermic adsorption reaction of a first of said compounds having a lower vapor pressure than a second of said compounds is directed to a reactor containing a compound having the next higher vapor pressure for driving an endothermic desorption reaction thereof.

17. A method of claim 1 including, in said first reaction cycle, pressurizing a third portion of said reactors at a third pressure whereby said compound therein absorbs said gaseous reactant in an exothermic reaction, said second and third pressures being different from one another and less than said first pressure.

18. A method of claim 17 including, in said second reaction cycle, operating said third portion of said reactors at a temperature resulting in said first or second pressure whereby said compound therein desorbs said gaseous reactant in an endothermic reaction.

19. An improved method of staging solid-vapor compound reactions comprising:

selecting a plurality of two or more different compounds comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, wherein each of said compounds has a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant, wherein said gaseous reactant is selected from the group consisting of ammonia, water, carbon dioxide, sulfur dioxide, lower alkanol, alkylamine, polyamine and phosphine, and wherein said solid reactant is a metal oxide, halide, carbonate, nitrate, nitrite, sulfate, oxalate or sulfides of a metal selected from the group consisting of alkali metal, alkaline earth metal, transition metal, aluminum, zinc, cadmium, and tin, or a double metal chloride of metals selected from the group consisting of an alkali metal alkaline earth metal, aluminum, manganese, iron, nickel and cobalt,

locating a different one of said compounds in a different one of a plurality of reactors,

in a first reaction cycle, operating a first portion of said reactors at a temperature resulting in a first pressure, whereby said compound therein desorbs said gaseous reactant in an endothermic reaction and directing the desorbed gaseous reactant to receiving means for adsorbing said gaseous reactant, and operating said second portion of said reactors at a second pressure, lower than said first pressure, and directing gaseous reactant from receiving means thereto whereby said compound therein adsorbs said gaseous reactant in an exothermic reaction, and

in a second reaction cycle, operating said first portion of said reactors at said second pressure and directing gaseous reactant from receiving means thereto whereby said compound therein adsorbs said gaseous reactant in an exothermic reaction and operating said second portion of said reactors at a temperature resulting in said first pressure whereby said compounds therein desorb said gaseous reactant in and endothermic reaction, and

directing said desorbed gaseous reactant to receiving means for adsorbing said gaseous reactant.

20. The method of claim 19 comprising selecting said plurality of compounds such that each of said compounds adsorb and desorb the same gaseous reactant at different temperatures, respectively, at said reaction pressures.

21. The method of claim 20 comprising locating said compounds into successive reactors in successive ascending order of gas vapor pressure.

22. The method of claim 21 wherein said compounds are selected such that the adsorption temperature of a lower vapor pressure compound at a low reaction pressure, is higher than the desorption temperature the next successive higher vapor pressure compound at a high reaction pressure.

23. A method of claim 19 including, in said first reaction cycle, pressurizing a third portion of said reactors at a third pressure whereby said compound therein absorbs said gaseous reactant is an exothermic reaction, said second and third pressures being different from one another and less than said first pressure.

24. A method of claim 23 including, in said second reaction cycle, operating said third portion of said reactors at a temperature resulting in a first or second pressure whereby said compound therein desorbs said gaseous reactant in an endothermic reaction.

25. The method of claim 19 comprising directing at least a portion of the heat released from said exothermic adsorption reaction to a reactor for heating compounds therein for driving an endothermic desorption reaction.

26. An improved method of staging solid-vapor compound reactions comprising:

selecting a plurality of two or more different compounds comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, wherein each of said compounds has a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant, wherein said gaseous reactant is selected from the group consisting of ammonia, water, carbon dioxide, sulfur dioxide, lower alkanol, alkylamine, polyamine and phosphine, and wherein said solid reactant is a metal oxide, halide, carbonate, nitrate, nitrate, sulfate, oxalate or sulfide of a metal selected from the group consisting of alkali methal, alkaline earth metal, transition metal, aluminum, zinc, cadmium, and tin, or a double metal chloride of metals selected from the group consisting of an alkali metal, alkaline earth metal, aluminum, manganese, iron, nickel and cobalt,

locating a different one of said compounds in a different one of a plurality reactors,

in a first reaction cycle, operating a first position of said reactors at a temperature resulting in a first pressure, whereby said compound therein desorbs said gaseous reactant at said pressure in an endothermic reaction and directing the desorbed gaseous reactant to a condenser and operating said second portion of said reactors at a second pressure, lower than said first pressure, and directing gaseous reactant from an evaporator thereto whereby said compound therein adsorbs said gaseous reactant in an exothermic reaction,

in a second reaction cycle, operating said first portion of said reactors at said second pressure and directing gaseous reactant from said evaporator thereto whereby said compound therein adsorbs said gaseous reactant in an exothermic reaction, and operating said second portion of said reactors at a temperature resulting in said first pressure whereby said compounds therein desorb said gaseous reactant in an endothermic reaction and directing said desorbed gaseous reactant to said condenser, and

directing said gaseous reactant from said condenser to said evaporator during said first and second reaction cycles, respectively.

27. The method of claim 26 comprising selecting said plurality of compounds such that each of said compounds adsorb and desorb the same gaseous reactant at different temperatures, respectively, at said reaction pressures.

28. The method of claim 27 comprising locating said compounds into successive reactors in successive ascending order of gas vapor pressure.

29. The method of claim 28 wherein said compounds are selected such that the adsorption temperature of a lower vapor pressure compound at a low reaction pressure, is higher than the desorption temperature at the next successive higher vapor pressure compound at a high reaction pressure.

30. A method of claim 26 including, in said first reaction cycle, pressurizing a third portion of said reactors at a third pressure whereby said compound therein adsorbs said gaseous reactant in an exothermic reaction, said second and third pressures being different from one another and less than said first pressure.

31. A method of claim 30 including, in said second reaction cycle, operating said third portion of said reactors at a temperature resulting in said first or second pressure whereby said compound therein desorbs said gaseous reactant in an endothermic reaction.

32. The method of claim 26 comprising directing at least a portion of the heat released from said exothermic adsorption reaction to a reactor for heating compounds therein for driving an endothermic desorption reaction.

33. An improved method of operating a mechanical or pressure driven heat pump or refrigeration system comprising:

selecting a plurality of two or more different compounds comprising a solid reactant adsorbent and a gaseous reactant absorbed thereon, wherein each of said complex compounds has a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant,

locating a different one of said compounds in a different one of a plurality of reactors,

in a first reaction cycle, pressurizing a first portion of said reactors at a first pressure, whereby said compound therein desorbs said gaseous reactant at said first pressure in an endothermic reaction, and pressurizing said second portion of said reactors at a second pressure, higher than said first pressure, whereby said compound therein adsorbs said gaseous reactant at said second pressure in an exothermic reaction, and

in a second reaction cycle, pressurizing said first portion of said reactors at said second pressure whereby said compound therein adsorbs said gaseous reactant at said second pressure in an exothermic reaction, and pressurizing said second portion of said reactors at said first pressure whereby said compounds therein desorb said gaseous reactant at said first pressure in an endothermic reaction, and

directing at least a portion of the heat released from said exothermic adsorption reaction to a reactor for heating compounds therein for driving an endothermic desorption reaction.

34. The method of claim 33 comprising selecting said plurality of compounds such that each of said compounds adsorb and desorb the same gaseous reactant at different temperatures, respectively, at said reaction pressures.

35. The method of claim 34 comprising introducing said compounds into successive reactors in successive ascending order of adsorption temperature at the same adsorption pressure.

36. The method of claim 35 wherein said compounds are selected such that the adsorption temperature of a compound, at adsorption pressure, is higher than the desorption temperature of the next lower vapor pressure compound, at desorption pressure.

37. A method of claim 33 including, in said first reaction cycle, pressurizing a third portion of said reactors at a thrid pressure whereby said compound therein adsorbs said gaseous reactant in an exothermic reaction, said second and third pressures being different from one another and greater than said first pressure.

38. A method of claim 37 including, in said second reaction cycle, pressurizing said third portion of said reactors at said first or second pressure whereby said compound therein desorbs said gaseous reactant in an endothermic reaction.

39. An apparatus comprising:

a plurality of two or more reaction chambers each of said chambers having a different compound therein comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, each of said compounds having a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant therein, wherein said gaseous reactant is selected from the group consisting of ammonia, water, carbon dioxide, sulfur dioxide, a lower alkanol, lower alkane, alkylamine, polyamine and phosphine and said solid reactant is an inorganic salt selected from the group consisting of a metal oxide, halide, carbonate, oxalate, nitrate, nitrite, sulfite, and sulfate, wherein said metal is selected from the group consisting of alkali metal, alkaline earth metal, transition metal, aluminum, zinc, cadmium, and tin, or a double metal chloride of metals selected from the group consisting of an alkali metal, alkaline earth metal, aluminum, manganese, iron, nickel and cobalt,

heating means for introducing heat into at least one of said chambers, means for directing heat transfer fluid to and from said reaction chambers, and heat exchange means for selectively recovering and/or absorbing heat from said reaction chambers, and

a condenser, an evaporator, conduit means for directing gaseous reactant from each of said reaction chambers to said condenser, and conduit means for directing gaseous reactant from said evaporator to each of said reaction chambers.

40. An apparatus comprising:

a plurality of two or more reaction chambers each of said chambers having a different compound therein comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, each of said compounds having a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant therein, wherein said gaseous reactant is selected from the group consisting of ammonia, water, carbon dioxide, sulfur dioxide, a lower alkanol, lower alkane, alkylamine, polyamine and phosphine and said solid reactant is an inorganic salt selected from the group consisting of a metal oxide, halide, carbonate, oxalate, nitrate, nitrite, sulfite, and sulfate, wherein said metal is selected from the group consisting of alkali metal, alkaline earth metal, transition metal, aluminum, zinc, cadmium, and tin, or a double metal chloride of metals selected from the group consisting of an alkali metal, alkaline earth metal, aluminum, manganese, iron, nickel and cobalt,

heating means for introducing heat into at least one of said chambers, means for directing heat transfer fluid to and from said reaction chambers, and heat exchange means for selectively recovering and/or absorbing heat from said reaction chambers, and

receiving means for adsorbing and desorbing said gaseous reactant.

41. Apparatus of claim 40 wherein said receiving means comprises reactors containing a solid adsorbent or liquid absorbent composition.

42. An apparatus comprising:

a plurality of two or more reaction chambers each of said chambers having a different compound therein comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, each of said compounds having a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant therein, wherein said gaseous reactant is selected from the group consisting of ammonia, water, carbon dioxide, sulfur dioxide, a lower alkanol, lower alkane, alkylamine, polyamine and phosphine and said solid reactant is an inorganic salt selected from the group consisting of a metal oxide, halide, carbonate, oxalate, nitrate, nitrite, sulfite, and sulfate, wherein said metal is selected from the group consisting of alkali metal, alkaline earth metal, transition metal, aluminum, zinc, cadmium, and tin, or a double metal chloride of metals selected from the group consisting of an alkali metal, alkaline earth metal, aluminum, manganese, iron, nickel and cobalt,

heating means for introducing heat into at least one of said chambers, means for directing heat transfer fluid to and from said reaction chambers, and heat exchange means for selectively recovering and/or absorbing heat from said reaction chambers, and

a pressure activated heat pump for receiving gaseous reactant directed from said chambers.

43. Apparatus of claim 42 wherein said pressure activated heat pump comprises a plurality of two or more reaction sites each having a different compound therein comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, each of said compounds having a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant therein.

44. Apparatus of claim 43 wherein said compounds have an ascending order of gaseous reactant vapor pressure with the absorption temperature of a compound at a high reaction pressure being higher than the desorption temperature of the next successive lower vapor pressure compound at a low reaction pressure.

45. A heat activated heat pump apparatus comprising:

a plurality of three or more reaction chambers each of said chambers having a different compound therein comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, each of said compounds having a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant therein,

said compounds having an ascending order of gaseous reactant vapor pressure with the adsorption temperature of a lower vapor pressure compound at a low reaction pressure being higher than the desorption temperature of the next successive higher vapor pressure compound at a high reaction pressure, wherein said gaseous reactant is selected from the group consisting of ammonia, water, carbon dioxide, sulfur dioxide, lower alkanol, lower alkane, alkylamine, polyamine and phosphine and said solid reactant is an inorganic salt selected from the group consisting of a metal oxide, halide, carbonate, oxalate, nitrate, nitrite, sulfite and sulfate, wherein said metal is selected from the group consisting of alkali metal, alkaline earth metal, transition metal, aluminum, zinc, cadmium, and tin,

or solid salt comprising a double metal chloride of metals selected from the group consisting of al alkali metal, alkaline earth metal, aluminum, manganese, iron, nickel and cobalt.

46. Apparatus of claim 45 including means for directing heat from an adsorption reaction chamber to a desorption reaction chamber.

47. Apparatus of claim 45 including means for directing heat between reaction chambers and external heat exchange means.

48. A mechanical or pressure actuated heat pump apparatus comprising:

a plurality of two or more reaction chambers each of said chambers having a different compound therein comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, each of said compounds having a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant therein,

said compounds having an ascending order of adsorption, temperatures at the same adsorption and desorption pressure, respectively, and wherein the lower adsorption temperature compound adsorption temperature at high reaction pressure is higher than the desorption temperature of the next successive higher adsorption temperature compound at low reaction pressure wherein said gaseous reactant is selected from the group consisting of ammonia, water, carbon dioxide, sulfur dioxide, lower alkanol, lower alkane, alkylamine, polyamine and phosphine and said solid reactant is an inorganic salt selected from the group consisting of a metal oxide, halide, carbonate, oxalate, nitrate, nitrite, sulfite and sulfate, wherein said metal is selected from the group consisting of alkali metal, alkaline earth metal, transition metal, aluminum, zinc, cadmium, and tin, or solid salt comprising a double metal chloride of metals selected from the group consisting of an alkali metal, alkaline earth metal, aluminum, manganese, iron, nickel and cobalt.

49. Apparatus of claim 48 including means for directing heat from an adsorption reaction chamber to a desorption reaction chamber.

50. Apparatus of claim 48 including means for directing heat between adsorption reaction chambers and external heat exchange means.

51. Apparatus of claim 48 including means for directing heat between desorption reaction chambers and external heat exchange means.