CA1075187A - Flameless reboiler for reconcentrating liquid disiccant - Google Patents
Flameless reboiler for reconcentrating liquid disiccantInfo
- Publication number
- CA1075187A CA1075187A CA258,453A CA258453A CA1075187A CA 1075187 A CA1075187 A CA 1075187A CA 258453 A CA258453 A CA 258453A CA 1075187 A CA1075187 A CA 1075187A
- Authority
- CA
- Canada
- Prior art keywords
- reboiler
- water
- outlet
- drum
- liquid desiccant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Drying Of Gases (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An apparatus for flamelessly reconcentrating liquid desiccant includes upper and lower enclosed reboiler drums having an enclosed heating section interposed therebetween.
Water-rich liquid desiccant is continuously recirculated between the upper and lower reboiler drums through riser conduits disposed within the heating section and return conduits exterior thereof. Simultaneously with the recirculation of the water-rich liquid desiccant an exhaust gas stream from a prime mover is passed through the heating section to conventionally heat the liquid desiccant within the riser conduits causing disengagement of water vapors therefrom. The upper drum includes an outlet for the disengaged water vapors and also an outlet for the resultant water-lean liquid desiccant.
An apparatus for flamelessly reconcentrating liquid desiccant includes upper and lower enclosed reboiler drums having an enclosed heating section interposed therebetween.
Water-rich liquid desiccant is continuously recirculated between the upper and lower reboiler drums through riser conduits disposed within the heating section and return conduits exterior thereof. Simultaneously with the recirculation of the water-rich liquid desiccant an exhaust gas stream from a prime mover is passed through the heating section to conventionally heat the liquid desiccant within the riser conduits causing disengagement of water vapors therefrom. The upper drum includes an outlet for the disengaged water vapors and also an outlet for the resultant water-lean liquid desiccant.
Description
~7Si~
Liquid desiccants such as di.ethylene glycol or triethylene glycol, which may be subsequen-tly referred to simply as glycol, have been widely accepted and are presently being used ~or dehydrat:Lng natural gas streams.
The dehydration occurs by the intimate mixing of the yas stream with the li.quid desiccant and the removal of water from the gas stream because of the greater affinity of water for the glycol t:han the gas stream.
The resultant moisture laden or water-rich glycol then must be dehydrated itself. Presently this dehydration of the glycol is accomplished by heating or reboiling the liquid above its boiling point so that the water is driven o~f and water-lean glycol is collected to be recycled to the contact zone of the natural gas stream.
A fire tube having an open flame is usually utilized to heat the water~laden glycol. In many situations the use of an open flame presents a problem due to the fire danger inherent to the use thereof. One situation occurs on off-shore platforms which are many miles from any fire fighting equipment and hence requires that all fire hazards be reduced to a minimum.
Most gas gathering systems have included therein internal comhustion type prime movers such as piston driven engines or gas fired turbines which utilize hydrocarbon : fluids as fuel. A11 of these engines p.roduce fairly high temperature exhaust gases, usually in the range from 700 to 1300 F. which when exhausted directly to atmosphere represent the loss oE amount of recoverable energy in the .~
- .. . . . .
~al71.Sl 51~
form ot` heat. Such losses have heretofore been considered to be largely unavoidable and in only isolated instances have efforts been extended to recover this energy.
It is therefore an object of this invention to present an apparatus for flamelessly reconcentrating liquid desiccant through utilization oF heat energy produced by an exhaust gas stream emanating from a prime mover.
According to the present i.nvention ther~ is provided a reboiler for reconcentrating liquid desiccant through utilization of exhaust gas from a prime mover comprising: an enclosed upper reboiler drum having means to receive water-rich-desiccant, a first outlet for disengaged water vapors and a second outlet ~or substantially reconcentrated hot water-lean liquid desic-cant, said means to receive remote from said second outlet; an enclosed lower reboiler chamber; a plurality of open-ended riser conduits located essential-ly between said means to receive and said second outlet each conduit having one end communicating with the interior of said lower reboiler chamber and having the other end protruding upwardly into said upper drum wherethrough liquid desiccant flows upwardly from said lower reboiler chamber into said upper reboiler drum; at least one downcomer having one end communicating with the interior of said upper reboiler drum and with the other end communicating with the interior of said lower reboiler chamber to provide downward circula-tion of~water-rich-liquid desiccant to said lower chamber as said desiccant moves to said second outlet; a liquid level control weir positioned within said upper reboiler drum adjacent said second outlet to provide overflow of water-lean desiccant to said second outlet; and an enclosed heating section, said heating section being disposed between said upper drum and lower reboiler chamber and enveloping said riser conduit onlyj said heating section having an m let~and an outlet for exhaust gas flowing from said prime mover trans-versely across said riser conduit, whereby liquid desiccant flowing by convec-tion within said riser conduit from said lower chamber to said upper drum is 30~ indirectly heated by said exhaust gas to disengage wa~er, as vapor therefrom;
, , , :: : : :
~75~i~7 said vapor eventually passlng through sa:id first outlet.
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention:
Figure 1 is a side view of an apparatus according to the invention.
Figure 2 is an end view of the apparatus.
Figure 3 is a cross-sectional view of the apparatus taken along line 3-3 of Figure l.
Looking now at Figure 1 of the clrawing, the apparatus comprises an enclosed vessel lO having three main sections, an upper reboiler drum 12, a bottom drum 14, and an enclosed heating section 16 disposed therebetween.
Upper reboiler drum 12 is subdivided into a cen~ral , .
~s~ - 3a -:
: , . ~ : .
, 1~7~
chamber 18, a liquid-holding chamber 20, and a water-lean desiccant chamber 22 by a liquid hold-back weir 24 and a liquid level control weir 26 appropriately disposed within the drum. The upper edge of liquid level control weir 26 is lower than the upper edge of liquid hold-back weir 28. ~lso included in upper reobiler drum 12 is an outlet for disengaged water vapors 28 and an outlet for water-lean desiccant 30, the utility of which will become evident in the subsequent description.
~ rrhe lower drum 14 is an enclosed rectangular structure having an inlet for water-rich desiccant which fluidly communicates with the liquid-holding chamber 20 throuyh conduit 32.
~ 3 Turning now to FIGURE ~, it can be seen that the lower drum 14 is interconnected to the central chamber of the upper drum by means of a plurality of open~ended riser conduits 34 which pass through the heating section 16 and protrude upwardly into central chamber 18. The riser conduits are appropriately sealed at the transversement thereof through a divider place 36 which separates the heating section and the upper reboiler drum. ~o increase the magnitude of heat transfer, riser conduits 34 have received on the outer surface thereof a plurality of transverse juxtaposed fins of relative thin sheet stock.
Positioned over the upper ends of each of the riser conduits are vapor caps 38. ~entral chamber 18 and bottom drum 14 are further intexconnected by return conduits 40 which pass therebetween exterior of the heating section and whose ~:
j .
.. ...
~Q7~ 7 upper ends are disposed within drum 12 at a level lower than the upper end of -the riser conduits.
Looking now at FIGURE 1 again, the heater section 16 encloses the riser conduits and embodies an inlet 42 for an exhaust gas stream received from a prime mover (not shown) and opposite the inlel: an exhaust gas outlet 44 to which is affixed an exhaust stack 46. A butterfly control ; valve 46 situated within the exhaust stack serves as a damper to control the volume o~ exhaust gas flow through the heating section and in turn is controlled by a kemperature sensing element appropriately mounted in central ~eboiler chamber 18. The butterfly control valve and associated temperature sensing element may require a bypass of all or part of the exhaust gas stream around the heating section.
Such bypassing systems are commonly known in the industry and can be easily installed by one skilled in the art.
Within the heating section adjacent inlet 42 is at least one diverter baffle 43 for distributin~ the hot exhaust gas stream uniformly around the length of the riser conduits.
Recieved over the disengaged water vapor outlet and secured to the reboiler drum is an upstanding elongated ~ -~; cylindrical distillation column 50 which embraces a vapor vent 52, a reflux condenser 54 section having an inlet and outlet, and a packed or tray section 56.
Directly below t~e bottom drum 14 is a surge tank 58 which rests upon feet 60 and which has disposed therein a heat exchange coil 62. The surge tank includes an inlet 64, : , ~: . .. .
: :
~,,( :, . ~. .. . . . .
,, . : , . : : , ~)7S~7 one end of which communicates with the water-lean desiccant ; outlet 30 through conduit 66. At the opposite end of the surge tank is a water-lean desiccant exit connection 6 for returning water-lean desiccant to an external yas dehydration system. The inlet of the heat exchanger coil ~ 62 is connected by conduit 70 to the outlet of the reflux ; condenser section 5~ and the outlet thereof is connected by conduit 72 to the distillation column 50 at a point above a portion of the trayed section 56 such that desiccant flowing therein is discharged within the column over a portion o~ the trays.
The vessel 10 has received thereover a blanket of . insulation 74 to retain the heat therein and consequently to increase the efficiency of the apparatus.
In operation, cool water-rich liquid desiccant 76 such as glycol, returning from an external process dehydration system enters the regeneration system at the inlet to the reflux condenser section 54 in the top of the distillation column 50. The liquid desiccant exits therefrom within conduit 70 and proceeds to enter and flow through heat exchanger coil 62 where the water-rich liquid desiccant receives heat from hot, water-lean, : desiccant flowing countercurrently in the surg~ tank 5~.
The water-rich liquid desiccant progresses from the heat exchanger coil through conduit 72 into the distillation column where it flows downwardly through a portion of the trayed section 56 and enters the liquid-holding chamber 20 in the upper reboiler drum 12, from whence it proceeds ~ ~ - 6 -:
.
. ' 1~37~ 7 downwardly throu~h conduit 32 into bottom drum 1~. The liquid desiccant then proceeds to and rises upwardly in the finned riser conduits 34 where heat i5 transferred thereto from a hot exhaust gas stream 78 in the heating section 16 until it is expelled from the upper end of the riser conduits into the main reboiler section 18.
Within the main reboiler section a natural convection type reboiling action takes place. That is, a portion of the desiccant is continually recirculated back to the bottom drum 1~ through the return conduits 40 and up through the riser conduits 3~ back into the main reboiler section where the liquid desiccant enters as a partial vapor and partial liquid stream. The vapor caps 38 installed over each of the riser conduits directs percolating liquid desiccant back down into the main reboiler section.
The water vapors disengaged from the liquid desiccant at the top of the riser conduit 34 ascend upwardly ~rom the main reboiler section into the distillation column and pass through the trayed and reflux condenser sections thereof where a portion of the vapors are condensed to liquid reflux and the remaining vapors are vented to atmosphere through vent 52.
A stream of hot, water-lean, reconcentrated liquid . . .
desiccant is continuously displaced from the main reboiler section 18 over level control weir 26 and exits from the , . . .
upper drum 12 through conduit 86 into surge tank 58, where the hot lean desiccant flows past the heating coil in a direction countercurrent to that of the flow of the cool, water-rich, liquid desiccant within the coil.
.
. . . . , . . . . ~ . - . .
': . ' - ;, ' , ., . ., :: , 11)75~7 ; In this manner heat is exchanged be-tween the cool, water-rich, glycol within the coil and the hot, water-lean desiccant in the surge tank. The water-lean liquid desiccant then exits from the regeneration system and returns to the external gas processing dehydration system.
Simultaneous with the heretofore discussed flow of the liquid desiccant, the stream of hot exhaust yases 78 coming from a prime mover enters the heating section 16 at the inlet thereof and is distributed around the outside of the finned riser conduits 34 by the diverter baffle 43 and the natural turbulence o~ the stream. Due to the heat differential between the hot exhaust gases and the water-rich liquid desiccant, heat is transferred to the desiccant withïn the riser conduits by convection over the finned metal surfaces and then by conduction and convection to the liquid desiccant inside the riser conduits. ~fter giving up a portion of the heat, the exhaust gas stream proceeds to the atmosphere through the stack 46. As previously mentioned the temperature of the liquid desiccant is controlled by regulating the volume of flow of the hot gas stream by a temperature sensor located within the main reboiler section 18 which activates a butterfly control damper valve located within the exhaust stack.
During the description of the preferred embodiments specific language has been used for the sake of clarity.
However, it is to be understood that the words used are not words of limitation and include all words which operate in a similar manner to accomplish a similar purpose.
:;
~ ~ - 8 -
Liquid desiccants such as di.ethylene glycol or triethylene glycol, which may be subsequen-tly referred to simply as glycol, have been widely accepted and are presently being used ~or dehydrat:Lng natural gas streams.
The dehydration occurs by the intimate mixing of the yas stream with the li.quid desiccant and the removal of water from the gas stream because of the greater affinity of water for the glycol t:han the gas stream.
The resultant moisture laden or water-rich glycol then must be dehydrated itself. Presently this dehydration of the glycol is accomplished by heating or reboiling the liquid above its boiling point so that the water is driven o~f and water-lean glycol is collected to be recycled to the contact zone of the natural gas stream.
A fire tube having an open flame is usually utilized to heat the water~laden glycol. In many situations the use of an open flame presents a problem due to the fire danger inherent to the use thereof. One situation occurs on off-shore platforms which are many miles from any fire fighting equipment and hence requires that all fire hazards be reduced to a minimum.
Most gas gathering systems have included therein internal comhustion type prime movers such as piston driven engines or gas fired turbines which utilize hydrocarbon : fluids as fuel. A11 of these engines p.roduce fairly high temperature exhaust gases, usually in the range from 700 to 1300 F. which when exhausted directly to atmosphere represent the loss oE amount of recoverable energy in the .~
- .. . . . .
~al71.Sl 51~
form ot` heat. Such losses have heretofore been considered to be largely unavoidable and in only isolated instances have efforts been extended to recover this energy.
It is therefore an object of this invention to present an apparatus for flamelessly reconcentrating liquid desiccant through utilization oF heat energy produced by an exhaust gas stream emanating from a prime mover.
According to the present i.nvention ther~ is provided a reboiler for reconcentrating liquid desiccant through utilization of exhaust gas from a prime mover comprising: an enclosed upper reboiler drum having means to receive water-rich-desiccant, a first outlet for disengaged water vapors and a second outlet ~or substantially reconcentrated hot water-lean liquid desic-cant, said means to receive remote from said second outlet; an enclosed lower reboiler chamber; a plurality of open-ended riser conduits located essential-ly between said means to receive and said second outlet each conduit having one end communicating with the interior of said lower reboiler chamber and having the other end protruding upwardly into said upper drum wherethrough liquid desiccant flows upwardly from said lower reboiler chamber into said upper reboiler drum; at least one downcomer having one end communicating with the interior of said upper reboiler drum and with the other end communicating with the interior of said lower reboiler chamber to provide downward circula-tion of~water-rich-liquid desiccant to said lower chamber as said desiccant moves to said second outlet; a liquid level control weir positioned within said upper reboiler drum adjacent said second outlet to provide overflow of water-lean desiccant to said second outlet; and an enclosed heating section, said heating section being disposed between said upper drum and lower reboiler chamber and enveloping said riser conduit onlyj said heating section having an m let~and an outlet for exhaust gas flowing from said prime mover trans-versely across said riser conduit, whereby liquid desiccant flowing by convec-tion within said riser conduit from said lower chamber to said upper drum is 30~ indirectly heated by said exhaust gas to disengage wa~er, as vapor therefrom;
, , , :: : : :
~75~i~7 said vapor eventually passlng through sa:id first outlet.
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention:
Figure 1 is a side view of an apparatus according to the invention.
Figure 2 is an end view of the apparatus.
Figure 3 is a cross-sectional view of the apparatus taken along line 3-3 of Figure l.
Looking now at Figure 1 of the clrawing, the apparatus comprises an enclosed vessel lO having three main sections, an upper reboiler drum 12, a bottom drum 14, and an enclosed heating section 16 disposed therebetween.
Upper reboiler drum 12 is subdivided into a cen~ral , .
~s~ - 3a -:
: , . ~ : .
, 1~7~
chamber 18, a liquid-holding chamber 20, and a water-lean desiccant chamber 22 by a liquid hold-back weir 24 and a liquid level control weir 26 appropriately disposed within the drum. The upper edge of liquid level control weir 26 is lower than the upper edge of liquid hold-back weir 28. ~lso included in upper reobiler drum 12 is an outlet for disengaged water vapors 28 and an outlet for water-lean desiccant 30, the utility of which will become evident in the subsequent description.
~ rrhe lower drum 14 is an enclosed rectangular structure having an inlet for water-rich desiccant which fluidly communicates with the liquid-holding chamber 20 throuyh conduit 32.
~ 3 Turning now to FIGURE ~, it can be seen that the lower drum 14 is interconnected to the central chamber of the upper drum by means of a plurality of open~ended riser conduits 34 which pass through the heating section 16 and protrude upwardly into central chamber 18. The riser conduits are appropriately sealed at the transversement thereof through a divider place 36 which separates the heating section and the upper reboiler drum. ~o increase the magnitude of heat transfer, riser conduits 34 have received on the outer surface thereof a plurality of transverse juxtaposed fins of relative thin sheet stock.
Positioned over the upper ends of each of the riser conduits are vapor caps 38. ~entral chamber 18 and bottom drum 14 are further intexconnected by return conduits 40 which pass therebetween exterior of the heating section and whose ~:
j .
.. ...
~Q7~ 7 upper ends are disposed within drum 12 at a level lower than the upper end of -the riser conduits.
Looking now at FIGURE 1 again, the heater section 16 encloses the riser conduits and embodies an inlet 42 for an exhaust gas stream received from a prime mover (not shown) and opposite the inlel: an exhaust gas outlet 44 to which is affixed an exhaust stack 46. A butterfly control ; valve 46 situated within the exhaust stack serves as a damper to control the volume o~ exhaust gas flow through the heating section and in turn is controlled by a kemperature sensing element appropriately mounted in central ~eboiler chamber 18. The butterfly control valve and associated temperature sensing element may require a bypass of all or part of the exhaust gas stream around the heating section.
Such bypassing systems are commonly known in the industry and can be easily installed by one skilled in the art.
Within the heating section adjacent inlet 42 is at least one diverter baffle 43 for distributin~ the hot exhaust gas stream uniformly around the length of the riser conduits.
Recieved over the disengaged water vapor outlet and secured to the reboiler drum is an upstanding elongated ~ -~; cylindrical distillation column 50 which embraces a vapor vent 52, a reflux condenser 54 section having an inlet and outlet, and a packed or tray section 56.
Directly below t~e bottom drum 14 is a surge tank 58 which rests upon feet 60 and which has disposed therein a heat exchange coil 62. The surge tank includes an inlet 64, : , ~: . .. .
: :
~,,( :, . ~. .. . . . .
,, . : , . : : , ~)7S~7 one end of which communicates with the water-lean desiccant ; outlet 30 through conduit 66. At the opposite end of the surge tank is a water-lean desiccant exit connection 6 for returning water-lean desiccant to an external yas dehydration system. The inlet of the heat exchanger coil ~ 62 is connected by conduit 70 to the outlet of the reflux ; condenser section 5~ and the outlet thereof is connected by conduit 72 to the distillation column 50 at a point above a portion of the trayed section 56 such that desiccant flowing therein is discharged within the column over a portion o~ the trays.
The vessel 10 has received thereover a blanket of . insulation 74 to retain the heat therein and consequently to increase the efficiency of the apparatus.
In operation, cool water-rich liquid desiccant 76 such as glycol, returning from an external process dehydration system enters the regeneration system at the inlet to the reflux condenser section 54 in the top of the distillation column 50. The liquid desiccant exits therefrom within conduit 70 and proceeds to enter and flow through heat exchanger coil 62 where the water-rich liquid desiccant receives heat from hot, water-lean, : desiccant flowing countercurrently in the surg~ tank 5~.
The water-rich liquid desiccant progresses from the heat exchanger coil through conduit 72 into the distillation column where it flows downwardly through a portion of the trayed section 56 and enters the liquid-holding chamber 20 in the upper reboiler drum 12, from whence it proceeds ~ ~ - 6 -:
.
. ' 1~37~ 7 downwardly throu~h conduit 32 into bottom drum 1~. The liquid desiccant then proceeds to and rises upwardly in the finned riser conduits 34 where heat i5 transferred thereto from a hot exhaust gas stream 78 in the heating section 16 until it is expelled from the upper end of the riser conduits into the main reboiler section 18.
Within the main reboiler section a natural convection type reboiling action takes place. That is, a portion of the desiccant is continually recirculated back to the bottom drum 1~ through the return conduits 40 and up through the riser conduits 3~ back into the main reboiler section where the liquid desiccant enters as a partial vapor and partial liquid stream. The vapor caps 38 installed over each of the riser conduits directs percolating liquid desiccant back down into the main reboiler section.
The water vapors disengaged from the liquid desiccant at the top of the riser conduit 34 ascend upwardly ~rom the main reboiler section into the distillation column and pass through the trayed and reflux condenser sections thereof where a portion of the vapors are condensed to liquid reflux and the remaining vapors are vented to atmosphere through vent 52.
A stream of hot, water-lean, reconcentrated liquid . . .
desiccant is continuously displaced from the main reboiler section 18 over level control weir 26 and exits from the , . . .
upper drum 12 through conduit 86 into surge tank 58, where the hot lean desiccant flows past the heating coil in a direction countercurrent to that of the flow of the cool, water-rich, liquid desiccant within the coil.
.
. . . . , . . . . ~ . - . .
': . ' - ;, ' , ., . ., :: , 11)75~7 ; In this manner heat is exchanged be-tween the cool, water-rich, glycol within the coil and the hot, water-lean desiccant in the surge tank. The water-lean liquid desiccant then exits from the regeneration system and returns to the external gas processing dehydration system.
Simultaneous with the heretofore discussed flow of the liquid desiccant, the stream of hot exhaust yases 78 coming from a prime mover enters the heating section 16 at the inlet thereof and is distributed around the outside of the finned riser conduits 34 by the diverter baffle 43 and the natural turbulence o~ the stream. Due to the heat differential between the hot exhaust gases and the water-rich liquid desiccant, heat is transferred to the desiccant withïn the riser conduits by convection over the finned metal surfaces and then by conduction and convection to the liquid desiccant inside the riser conduits. ~fter giving up a portion of the heat, the exhaust gas stream proceeds to the atmosphere through the stack 46. As previously mentioned the temperature of the liquid desiccant is controlled by regulating the volume of flow of the hot gas stream by a temperature sensor located within the main reboiler section 18 which activates a butterfly control damper valve located within the exhaust stack.
During the description of the preferred embodiments specific language has been used for the sake of clarity.
However, it is to be understood that the words used are not words of limitation and include all words which operate in a similar manner to accomplish a similar purpose.
:;
~ ~ - 8 -
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A reboiler for reconcentrating liquid desiccant through utilization of exhaust gas from a prime mover comprising:
an enclosed upper reboiler drum having means to receive water-rich-desiccant, a first outlet for disengaged water vapors and a second outlet for substantially reconcentrated hot water-lean liquid desiccant, said means to receive remote from said second outlet;
an enclosed lower reboiler chamber;
a plurality of open-ended riser conduits located essentially between said means to receive and said second outlet each conduit having one end communicating with the interior of said lower reboiler chamber and having the other end protruding upwardly into said upper drum wherethrough liquid desiccant flows upwardly from said lower reboiler chamber into said upper reboiler drum;
at least one downcomer having one end communicating with the interior of said upper reboiler drum and with the other end communicating with the interior of said lower reboiler chamber to provide downward circulation of water-rich-liquid desiccant to said lower chamber as said desiccant moves to said second outlet;
a liquid level control weir positioned within said upper reboiler drum adjacent said second outlet to provide overflow of water-lean desiccant to said second outlet;and an enclosed heating section, said heating section being disposed between said upper drum and lower reboiler chamber and enveloping said riser conduit only, said heating section having an inlet and an outlet for exhaust gas flowing from said prime mover transversely across said riser conduit, whereby liquid desiccant flowing by convection within said riser conduit from said lower chamber to said upper drum is indirectly heated by said exhaust gas to disengage water, as vapor therefrom; said vapor eventually passing through said first outlet.
an enclosed upper reboiler drum having means to receive water-rich-desiccant, a first outlet for disengaged water vapors and a second outlet for substantially reconcentrated hot water-lean liquid desiccant, said means to receive remote from said second outlet;
an enclosed lower reboiler chamber;
a plurality of open-ended riser conduits located essentially between said means to receive and said second outlet each conduit having one end communicating with the interior of said lower reboiler chamber and having the other end protruding upwardly into said upper drum wherethrough liquid desiccant flows upwardly from said lower reboiler chamber into said upper reboiler drum;
at least one downcomer having one end communicating with the interior of said upper reboiler drum and with the other end communicating with the interior of said lower reboiler chamber to provide downward circulation of water-rich-liquid desiccant to said lower chamber as said desiccant moves to said second outlet;
a liquid level control weir positioned within said upper reboiler drum adjacent said second outlet to provide overflow of water-lean desiccant to said second outlet;and an enclosed heating section, said heating section being disposed between said upper drum and lower reboiler chamber and enveloping said riser conduit only, said heating section having an inlet and an outlet for exhaust gas flowing from said prime mover transversely across said riser conduit, whereby liquid desiccant flowing by convection within said riser conduit from said lower chamber to said upper drum is indirectly heated by said exhaust gas to disengage water, as vapor therefrom; said vapor eventually passing through said first outlet.
2. An apparatus as in claim 1 including:
a distillation column disposed over said disengaged water vapor outlet; said distillation column having a stripping and rectifying portion for intermingling downwardly flowing water-rich liquid desiccant with said upwardly rising disengaged water vapors; said distillation column further including an outlet vent for said water vapors; and a hold back weir adjacent said means to receive having an upper edge at a higher level than the upper edge of said level control weir and being positioned within said upper reboiler drum so that said means to receive forms a reservoir for receiving said water-rich liquid desiccant flowing downwardly from said distillation column; said reservoir being in fluid communication with said lower reboiler chamber via at least one of said downcomers.
a distillation column disposed over said disengaged water vapor outlet; said distillation column having a stripping and rectifying portion for intermingling downwardly flowing water-rich liquid desiccant with said upwardly rising disengaged water vapors; said distillation column further including an outlet vent for said water vapors; and a hold back weir adjacent said means to receive having an upper edge at a higher level than the upper edge of said level control weir and being positioned within said upper reboiler drum so that said means to receive forms a reservoir for receiving said water-rich liquid desiccant flowing downwardly from said distillation column; said reservoir being in fluid communication with said lower reboiler chamber via at least one of said downcomers.
3. An apparatus as in claim 1 including:
a multiplicity of fins transversely received on said riser conduit along the longitudinal length thereof for increasing the heat transfer area thereof.
a multiplicity of fins transversely received on said riser conduit along the longitudinal length thereof for increasing the heat transfer area thereof.
4. An apparatus as in claim 1 including vapor caps disposed over the upper end of each of said riser conduits to direct percolating liquid desiccant down into said main section of said upper reboiler drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA258,453A CA1075187A (en) | 1976-08-04 | 1976-08-04 | Flameless reboiler for reconcentrating liquid disiccant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA258,453A CA1075187A (en) | 1976-08-04 | 1976-08-04 | Flameless reboiler for reconcentrating liquid disiccant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1075187A true CA1075187A (en) | 1980-04-08 |
Family
ID=4106579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA258,453A Expired CA1075187A (en) | 1976-08-04 | 1976-08-04 | Flameless reboiler for reconcentrating liquid disiccant |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1075187A (en) |
-
1976
- 1976-08-04 CA CA258,453A patent/CA1075187A/en not_active Expired
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