CN103185414A - Method and device utilizing low-grade waste heat - Google Patents
Method and device utilizing low-grade waste heat Download PDFInfo
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- CN103185414A CN103185414A CN2011104601687A CN201110460168A CN103185414A CN 103185414 A CN103185414 A CN 103185414A CN 2011104601687 A CN2011104601687 A CN 2011104601687A CN 201110460168 A CN201110460168 A CN 201110460168A CN 103185414 A CN103185414 A CN 103185414A
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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Abstract
The invention provides a method utilizing low-grade waste heat. The method comprises the following steps: smoke emitted by an absorption type direct-fired machine is introduced into a gas-gas heater to be subjected to sensible heat recovery; the smoke subjected to the sensible heat recovery is introduced into a smoke condensation type heat exchanger to be subjected to the latent heat recovery; the smoke subjected to latent heat recovery is emitted, the absorption type direct-fired machine is in operation in a cooling season mode in heating; and sensible heat recovered is transferred to hot water discharged from a circulating heating water outlet of the absorption type direct-fired machine, and the latent heat recovered is transferred to cool water discharged from the circulating heating water outlet of the absorption type direct-fired machine. The invention further provides a device utilizing low-grade waste heat, which comprises the absorption type direct-fired machine, a heating water input branch circuit, a heating water output branch circuit, a smoke heat exchanger and the smoke condensation type heat exchanger; the heating water input branch circuit is connected with a circulating heating water inlet, and the heating water output branch circuit is connected with the circulating heating water outlet; the smoke heat exchanger is used for sensible heat recovery to the smoke emitted from a smoke outlet of the absorption type direct-fired machine; and the smoke condensation type heat exchanger is used for latent heat recovery to the smoke subjected to sensible heat recovery. The method can improve the heat utilization rate of the direct-fired machine.
Description
Technical field
The present invention relates to a kind of method and low grade residual heat use device that utilizes low grade residual heat.
Background technology
Absorption direct combustion machine waste heat recovery scheme mainly is divided into two classes in the prior art, one class is to reclaim obvious heat of smoke by at direct combustion machine flue the flue gas heat exchange device being installed, and a class is by at direct combustion machine flue sensible heat and the part latent heat that condensing heat exchanger reclaims flue gas being installed.To the waste heat recovery of recirculated cooling water, generally adopt electricity to drive the formula heat pump and realize.
Fig. 1 is the technological process of the absorption direct combustion machine waste heat recovery of routine at present.Unlatching heating mode when at present conventional absorption direct combustion machine system move in heating season, its form is very similar to gas fired-boiler, combustion gas 205 enters after 1 burning of absorption direct combustion machine directly with heat transferred heating water direct combustion machine branch road 210, and the back of heating up forms 211 outputs of heating water main line.Common for installing flue gas heat exchange device 202 additional to the improved flow process of traditional process, tell from heating water main line 208 and directly to return heating water main line 211 after heating shredded tobacco for water pipes gas heat exchange branch road 209 enters 202 heat exchange of flue gas heat exchange device.Control valve 203 and 204 is separately positioned on 209 and 210, is used for regulating the flow on heating water main line 208 in the distribution of heating shredded tobacco for water pipes gas heat exchange branch road 209 and heating water direct combustion machine branch road 210.Because it is higher that heating water main line 208 enters the temperature of system, absorption direct combustion machine smoke evacuation 206 only has sensible heat to be displaced, and waste heat recovery is limited in one's ability.If the temperature on heating water main line 208 is lower, then to the having relatively high expectations of flue gas heat exchange device 202, must can handle sensible heat transfer, can handle the latent heat heat exchange again, economy is not good.
There are two big technological deficiencies in the prior art scheme, the one, cascade utilization is not accomplished in the waste heat recovery of direct combustion machine flue gas, the physical property of flue gas has very large difference in gaseous state section and condensation segment, the exhaust gas temperature of general direct combustion machine is more than 160 ℃, condensation temperature is about 80 ℃, as not dividing into two class heat exchanger cascade utilizations, then the economy of heat exchanger can become relatively poor, and heat exchange area is bigger; The 2nd, direct combustion machine flue gas heat and its thermal power rating do not match, and when adopting cooling condition to absorb waste heat, only can satisfy about 25% of its rated power even count the latent heat of flue gas yet, and all the other colds are waste certainly owing to can not find corresponding waste heat source.
Summary of the invention
At the problem that exists in the correlation technique, the object of the present invention is to provide a kind of method of utilizing low grade residual heat, and low grade residual heat use device, to improve direct combustion machine system efficiency of utilization.
For achieving the above object, the invention provides a kind of method of utilizing low grade residual heat on the one hand, comprising: with the flue gas that absorption direct combustion machine is discharged, introduce in the flue gas heat exchange device and also therein flue gas is carried out the sensible heat recovery; With the flue gas behind the recovery sensible heat, introduce in the flue gas condensing formula heat exchanger and therein the flue gas behind this recovery sensible heat is carried out the latent heat recovery; And the fume emission that will be recovered behind the latent heat falls, wherein, absorption direct combustion machine moves under refrigeration season pattern during season in heating, the sensible heat that reclaims is displaced to from the hot water that the circulation heating water out of absorption direct combustion machine is discharged, and the latent heat that reclaims is displaced to from the chilled water that the circulating frozen water out of absorption direct combustion machine is discharged.
Preferably, the inventive method also comprises: will be from the chilled water of circulating frozen water out discharge, absorb wherein cooling water institute heat content in the introducing recirculated cooling water heat exchanger; With absorbing chilled water behind the cooling water heat, carrying out heat release with absorbing to return in the absorption direct combustion machine after chilled water behind the latent heat converges, then the chilled water after the heat release is discharged from the circulating frozen water out.
Preferably, the inventive method also comprises: the chilled water that will discharge from the circulating frozen water out, converge with the chilled water that absorbs behind the latent heat; Chilled water after will converging is introduced in the recirculated cooling water heat exchanger and is absorbed wherein cooling water institute heat content; And will absorb chilled water after the cooling water institute heat content and return in the absorption direct combustion machine and carry out heat release, then the chilled water after the heat release is discharged from the circulating frozen water out.
Preferably, the flue-gas temperature of discharging from absorption direct combustion machine is more than 160 ℃, and its condensation temperature is 80 ℃.
The present invention also provides a kind of low grade residual heat use device on the other hand, and it comprises: absorption direct combustion machine has circulation heating water out, circulation heating water inlet, circulating frozen water inlet, circulating frozen water out, exhanst gas outlet; The heating water input branch road that is connected with circulation heating water inlet, the heating water that is connected with circulation heating water out output branch road; The flue gas of discharging from exhanst gas outlet is carried out the flue gas heat exchange device that sensible heat reclaims, it has first and second heat exchanger channels, wherein the entrance of first heat exchanger channels is communicated with exhanst gas outlet, the entrance of second heat exchanger channels is communicated with heating water input branch road, and the outlet of second heat exchanger channels is communicated with heating water output branch road; Flue gas behind the recovery sensible heat is carried out the flue gas condensing formula heat exchanger that latent heat reclaims, it has third and fourth heat exchanger channels, wherein the entrance of the 3rd heat exchanger channels is communicated with the outlet of first heat exchanger channels, the entrance of the 4th heat exchanger channels is communicated with the circulating frozen water out, and the outlet of the 4th heat exchanger channels is communicated with the circulating frozen water inlet.
Preferably, apparatus of the present invention also comprise: the recirculated cooling water heat exchanger, and it has the 5th and the 6th heat exchanger channels, and the entrance of the 5th heat exchanger channels is communicated with the circulating frozen water out, and the outlet of the 5th heat exchanger channels is communicated with the circulating frozen water inlet; And the cooling water that is communicated with the entrance of the 6th heat exchanger channels is imported branch road, is exported the cooling water backflow branch road that is communicated with the 6th heat exchanger channels.
Preferably, apparatus of the present invention also comprise: cross-line, and the one end is communicated with the outlet of the 4th heat exchanger channels of flue gas condensing formula heat exchanger, and its other end is communicated with the entrance of the 5th heat exchanger channels of recirculated cooling water heat exchanger; And be connected the flow through cross-line valve of chilled-water flow of cross-line of control on the cross-line.
Preferably, heating water input branch road is divided into first branch line, second branch line, and wherein first branch line is communicated with circulation heating water inlet, and second branch line is communicated with the entrance of second heat exchanger channels of flue gas heat exchange device.
Preferably, on first branch line, on second branch line, be connected with a flow control valve respectively.
Preferably, in the exit of the 3rd heat exchanger channels of flue gas condensing formula heat exchanger, be connected with the blast pipe of discharging for the flue gas that is absorbed behind the latent heat.
Useful technique effect of the present invention is: the flue gas that absorption direct combustion machine is discharged under refrigeration mode, adopting the flue gas heat exchange device to carry out sensible heat reclaims, and the flue gas after adopting flue gas condensing formula heat exchanger to the recovery sensible heat carries out the latent heat recovery, this employing flue gas two-part heat exchange mode reclaims the scheme of obvious heat of smoke and latent heat respectively, has realized the low grade residual heat of absorption direct combustion machine is carried out the step recovery.Further, owing to will be divided into sensible heat and latent heat two type heat exchangers in order to the heat exchanger with flue gas heat exchange (namely, described flue gas heat exchange device and described flue gas condensing formula heat exchanger) not only can effectively utilize fume afterheat, the also corresponding reduction of requirement of the design of heat exchanging device, material and flow process control, better economy.
In addition, the present invention also introduces the auxiliary circulation cooling water heat exchanger, to send into the heat in the outer circulation cooling water in the circulated refrigerated water of absorption direct combustion machine as additional heat, this has solved in the prior art waste that does not match and cause owing to direct combustion machine flue gas heat and its thermal power rating, namely solves the problem that fume afterheat in the prior art is not enough to compensate the specified refrigeration work consumption of direct combustion machine.
Thus, when absorption direct combustion machine is operating in refrigeration mode following time heating season, the heat that the present invention can take away flue gas all reclaims, moreover, the used heat that above-mentioned outer circulation cooling water brings also can be and the invention provides the closely heat of half, make it to promote for can direct applied heating heat, the thermal efficiency of the present invention can significantly improve.Thereby the present invention has obviously improved UTILIZATION OF VESIDUAL HEAT IN ability and the heat capacity and feasible more flexible to the control and regulation of apparatus of the present invention of direct combustion machine.
Description of drawings
Fig. 1 is the technological process of conventional absorption direct combustion machine waste heat recovery in the prior art;
Fig. 2 is the schematic diagram of the embodiment of low grade residual heat use device of the present invention.
Among Fig. 2:
1 absorption direct combustion machine
2 recirculated cooling water heat exchangers
3 flue gas condensing formula heat exchangers
4 flue gas heat exchange devices
5 chilled water branch road recirculated cooling water heat exchanger inlet valves
6 chilled water branch road recirculated cooling water heat exchanger exit valves
7 cross-line valves
8 chilled water branch road condensing heat exchanger inlet valves
9 chilled water branch road condensing heat exchanger outlet valves
10 heating shredded tobacco for water pipes gas heat exchange branch road control valves
11 heating water direct combustion machine branch road control valves
12 combustion gas
13 chilled water direct combustion machines go out pipeline
14 chilled water condensing heat exchanger branch roads
Branch road before the 15 chilled water recirculated cooling water heat exchanger valves
16 cross-lines
Branch road behind the 17 chilled water recirculated cooling water heat exchanger valves
Branch road before the valve behind the 18 chilled water condensing heat exchangers
Branch road behind the valve behind the 19 chilled water condensing heat exchangers
Branch road behind the 20 chilled water recirculated cooling water heat exchangers
21 chilled water direct combustion machine inlet pipe roads
22 cooling waters input branch road
23 cooling waters output branch road
24 direct combustion machine flue gases go out pipeline
After changing, 25 direct combustion machine obvious heat of smoke go out pipeline
26 flue gas exhaust pipes
27 heating water input branch road
28 first branch lines
29 heating shredded tobacco for water pipes gas heat exchange branch roads
30 heating water output branch road
31 heating water go out end.
The specific embodiment
Below referring to accompanying drawing the specific embodiment of the present invention is described.
Describe the method for utilizing low grade residual heat of the present invention referring to Fig. 2, it comprises: with the flue gas that absorption direct combustion machine 1 is discharged, introduce in the flue gas heat exchange device 4 and also therein flue gas is carried out the sensible heat recovery; With the flue gas behind the recovery sensible heat, introduce in the flue gas condensing formula heat exchanger 3 and therein the flue gas behind this recovery sensible heat is carried out the latent heat recovery; The fume emission that is recovered behind the latent heat is fallen, wherein, absorption direct combustion machine 1 moves under refrigeration season pattern during season in heating, the sensible heat that reclaims is displaced to from the hot water that the circulation heating water out of absorption direct combustion machine 1 is discharged, and the latent heat that reclaims is displaced to from the chilled water that the circulating frozen water out of absorption direct combustion machine 1 is discharged.
Continuation is referring to Fig. 2, and the inventive method also comprises: will be from the chilled water of circulating frozen water out 104 discharges, absorb wherein cooling water institute heat content in the introducing recirculated cooling water heat exchanger 2; With absorbing chilled water behind the cooling water heat, carrying out heat release with absorbing to return in the absorption direct combustion machine 1 after chilled water behind the latent heat converges, then the chilled water after the heat release is discharged from circulating frozen water out 104.As a kind of interchangeable mode, the inventive method also comprises: the chilled water that will discharge from the circulating frozen water out, converge with the chilled water that absorbs behind the latent heat; Chilled water after will converging is introduced in the recirculated cooling water heat exchanger 2 and is absorbed wherein cooling water institute heat content; Return in the absorption direct combustion machine 1 and carry out heat release absorbing chilled water after the cooling water institute heat content, then the chilled water after the heat release is discharged from circulating frozen water out 104.Preferably, the flue-gas temperature of discharging from absorption direct combustion machine 1 among the present invention is more than 160 ℃, and its condensation temperature is 80 ℃.
On the other hand, the present invention also provides a kind of low grade residual heat use device, and it comprises: absorption direct combustion machine 1 has circulation heating water out 102, circulation heating water inlet 101, circulating frozen water inlet 105, circulating frozen water out 104, exhanst gas outlet 103; The heating water input branch road 27 that is connected with circulation heating water inlet 101, the heating water that is connected with circulation heating water out 102 output branch road 30; The flue gas of discharging from exhanst gas outlet is carried out the flue gas heat exchange device 4 that sensible heat reclaims; Flue gas behind the recovery sensible heat is carried out the flue gas condensing formula heat exchanger 3 that latent heat reclaims.Wherein flue gas heat exchange device 4 has first and second heat exchanger channels, and the entrance of first heat exchanger channels is communicated with exhanst gas outlet 103, and the entrance of second heat exchanger channels is communicated with heating water input branch road 27, and the outlet of second heat exchanger channels is communicated with heating water output branch road 30.Flue gas condensing formula heat exchanger 3 has third and fourth heat exchanger channels, the entrance of the 3rd heat exchanger channels is communicated with the outlet of first heat exchanger channels, the entrance of the 4th heat exchanger channels is communicated with circulating frozen water out 104, and the outlet of the 4th heat exchanger channels is communicated with circulating frozen water inlet 105.In the exit of the 3rd heat exchanger channels of flue gas condensing formula heat exchanger 3, be connected with the blast pipe 26 of discharging for the flue gas that is absorbed behind the latent heat.
Shown in Fig. 2: heating water input branch road 27 is divided into first branch line 28, second branch line, wherein first branch line 28 is communicated with circulation heating water inlet 101, second branch line is communicated with the entrance of second heat exchanger channels of flue gas heat exchange device 4, and on first branch line 28, on second branch line, be connected with a flow control valve 11 respectively, 10.
Further, apparatus of the present invention also comprise shown in Fig. 2: recirculated cooling water heat exchanger 2 and cooling water input branch road 22, cooling water output branch road 23.Recirculated cooling water heat exchanger 2 has the 5th and the 6th heat exchanger channels, the entrance of the 5th heat exchanger channels is communicated with circulating frozen water out 104, the outlet of the 5th heat exchanger channels is communicated with circulating frozen water inlet 105, cooling water input branch road 22 is communicated with the entrance of the 6th heat exchanger channels, and cooling water output branch road 23 is communicated with the outlet of the 6th heat exchanger channels.
Further again, cross-line 16 has been shown among Fig. 2, has been connected the cross-line valve 7 on the cross-line 16, cross-line valve 7 is controlled the chilled-water flow of the cross-line 16 of flowing through.One end of cross-line 16 is communicated with the outlet of the 4th heat exchanger channels of flue gas condensing formula heat exchanger 3, and the other end of cross-line 16 is communicated with the entrance of the 5th heat exchanger channels of recirculated cooling water heat exchanger 2.
Below referring to Fig. 2, the workflow of an embodiment of apparatus of the present invention is described.
Refrigeration season mode operation is pressed in absorption direct combustion machine 1 heating during season, combustion gas 12 enters absorption direct combustion machine 1 burning back and produces chilled water, chilled water direct combustion machine goes out pipeline 13 and is divided into two-way: branch road 15 before chilled water condensing heat exchanger branch road 14, the chilled water recirculated cooling water heat exchanger valve, chilled water enters flue gas condensing formula heat exchanger 3 through branch road 14, wherein branch road 14 is provided with inlet valve 8, and chilled water enters recirculated cooling water heat exchanger 2 through branch road 15 through inlet valve 5, branch road 17.After heating up through flue gas condensing formula heat exchanger 3 from the chilled water of branch road 14, behind branch road 18, outlet valve 9, enter behind the chilled water condensing heat exchanger branch road 19 behind the valve; After chilled water process recirculated cooling water heat exchanger 2 intensifications from branch road 15, branch road 20 after outlet valve 6 enters chilled water recirculated cooling water heat exchanger, enter chilled water direct combustion machine inlet pipe road 21 after both converge, directly return absorption direct combustion machine 1, it is closed circuit to constitute the chilled water circulation.
From absorption direct combustion machine 1, discharge flue gas, go out pipeline 24 through direct combustion machine flue gas and enter flue gas heat exchange device 4, heating water branch road 27 is used for importing from apparatus of the present invention with external heating water, heating water branch road 27 is divided into first branch line 28 and second branch line, heating water enters absorption direct combustion machine 1 through first branch line 28, heating water through flue gas heat exchange device 4 with 4 heat exchange of flue gas heat exchange device after, directly return heating water output branch road 30 through heating shredded tobacco for water pipes gas heat exchange branch road 29, converge the back with hot water from branch road 30 and go out end 31 from heating water and flow out and supply with clients etc.After going out flue gas that pipeline 24 discharges and enter 4 heat exchange of flue gas heat exchange device from direct combustion machine flue gas, go out pipeline 25 after changing by direct combustion machine obvious heat of smoke and enter flue gas condensing formula heat exchanger 3, since lower from the flue-gas temperature of pipeline 25, be condensed the back from 26 discharges of flue gas exhaust pipe through flue gas condensing formula heat exchanger 3 flue gases.The refrigerating capacity of absorption direct combustion machine 1 is stronger, and the flue gas in the pipeline 24 can't satisfy all the other heat demands, goes into 22 so draw cooling water input branch road, cooling water with leave apparatus of the present invention from cooling after the chilled water heat exchange of branch road 15 by cooling water output branch road 23.Cross-line 16 is in order to be that cross-line regulates in the system, and Temperature Distribution is rationally or switch under fault state in use to make apparatus of the present invention.
For further understanding the present invention, the relational language that the present invention is occurred is explained as follows:
Absorption direct combustion machine: absorption direct combustion machine is to adopt fuel gas directly to burn, and refrigeration, heating and health hot water are provided.During cooling condition, generally be refrigerant with water, finish kind of refrigeration cycle by low temperature absorption and the high temperature desorb of lithium-bromide solution.During heating condition, then be similar to waste heat boiler, the heat of fuel gas buring is directly conducted to heating water by the circulation of lithium-bromide solution.
Flue gas: various fuel gas or fuel oil are still contained certain sensible heat and a large amount of condensation latent heat at the high-temperature gas product that absorption direct combustion machine internal combustion forms by the flue gas after the utilization of direct combustion machine.
Recirculated cooling water: the widely used device circulating water cooled that is used in industry.To device to be lowered the temperature, carry by the cooling water pipe network from the cooling water of cooling water cooling tower cooling, return cooling recycling again after the intensification.
The flue gas heat exchange device: adopt water or other medium and flue gas to carry out the heat transmission equipment of exchange heat, be generally shell and tube or plate type heat exchanger, body is bigger, mainly absorbs the sensible heat of flue gas.
Condensing heat exchanger: adopt water or other medium and the heat transmission equipment that carries out exchange heat near the flue gas of dew point, be generally the plate type heat exchanger of stainless steel, body is less relatively, mainly absorbs the latent heat of flue gas.It is provided with steam trap connection, flue gas condensing liquid can be discharged.
The recirculated cooling water heat exchanger: cold and hot medium is the heat transmission equipment of water, and the overwhelming majority is plate type heat exchanger, is a kind of common heat exchanger that volume is less, efficient is very high, mostly is stainless steel.
Referring to accompanying drawing 2, producing heat energy 210kw (or cold energy 210kw) with the 220kw-230kw combustion gas at absorption direct combustion machine 1 is example, flue gas heat exchange device 4 is from smoke absorption sensible heat 30kw, flue gas condensing formula heat exchanger 3 absorbs cold energy 160kw by recirculated cooling water heat exchanger 2 from waste circulating cooling water from smoke absorption latent heat 35kw.The energy of above-mentioned all absorptions is equivalent to enter about 150% (this numerical value calculates according to the combustion gas low heat value) of the fuel gas calorie of direct combustion machine 1.Comparatively speaking, under similarity condition, illustrate in the prior art at Fig. 1, its heating efficient is 90%.
To sum up, the flue gas that the present invention discharges under refrigeration mode absorption direct combustion machine, adopting the flue gas heat exchange device to carry out sensible heat reclaims, and the flue gas after adopting flue gas condensing formula heat exchanger to the recovery sensible heat carries out the latent heat recovery, this employing flue gas two-part heat exchange mode reclaims the scheme of obvious heat of smoke and latent heat respectively, has realized the low grade residual heat of absorption direct combustion machine is carried out the step recovery.Further, owing to will be divided into sensible heat and latent heat two type heat exchangers in order to the heat exchanger with flue gas heat exchange (namely, described flue gas heat exchange device and described flue gas condensing formula heat exchanger) not only can effectively utilize fume afterheat, the also corresponding reduction of requirement of the design of heat exchanging device, material and flow process control, better economy.In addition, the present invention also introduces the auxiliary circulation cooling water heat exchanger, to send into the heat in the outer circulation cooling water in the circulated refrigerated water of absorption direct combustion machine as additional heat, this has solved in the prior art waste that does not match and cause owing to direct combustion machine flue gas heat and its thermal power rating, namely solves the problem that fume afterheat in the prior art is not enough to compensate the specified refrigeration work consumption of direct combustion machine.Thus, when absorption direct combustion machine is operating in refrigeration mode following time heating season, the heat that the present invention can take away flue gas all reclaims, moreover, the used heat that above-mentioned outer circulation cooling water brings also can be and the invention provides the closely heat of half, make it to promote for can direct applied heating heat, the thermal efficiency of the present invention can significantly improve.Thereby the present invention has obviously improved UTILIZATION OF VESIDUAL HEAT IN ability and the heat capacity and feasible more flexible to the control and regulation of apparatus of the present invention of direct combustion machine.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method of utilizing low grade residual heat is characterized in that, comprising:
With the flue gas that absorption direct combustion machine (1) is discharged, introduce in the flue gas heat exchange device (4) and also therein described flue gas is carried out the sensible heat recovery;
With the flue gas behind the recovery sensible heat, introduce in the flue gas condensing formula heat exchanger (3) and also therein the flue gas behind the described recovery sensible heat is carried out the latent heat recovery; And
The fume emission that is recovered behind the latent heat is fallen,
Wherein, described absorption direct combustion machine (1) moves under refrigeration season pattern during season in heating, the sensible heat that reclaims is displaced to from the hot water that the circulation heating water out of described absorption direct combustion machine (1) is discharged, and the latent heat that reclaims is displaced to from the chilled water that the circulating frozen water out of described absorption direct combustion machine (1) is discharged.
2. method according to claim 1 is characterized in that, also comprises:
To absorb wherein cooling water institute heat content in the introducing recirculated cooling water heat exchanger (2) from the chilled water of described circulating frozen water out discharge;
With absorbing chilled water behind the cooling water heat, carrying out heat release with absorbing to return in the described absorption direct combustion machine (1) after chilled water behind the described latent heat converges, then the chilled water after the heat release is discharged from described circulating frozen water out.
3. method according to claim 1 is characterized in that, also comprises:
The chilled water that to discharge from described circulating frozen water out, converge with the chilled water that absorbs behind the described latent heat;
Chilled water after will converging is introduced in the recirculated cooling water heat exchanger (2) and is absorbed wherein cooling water institute heat content; And
Return in the described absorption direct combustion machine (1) and carry out heat release absorbing chilled water after the described cooling water institute heat content, then the chilled water after the heat release is discharged from described circulating frozen water out.
4. according to each described method among the claim 1-3, it is characterized in that the flue-gas temperature of discharging from described absorption direct combustion machine (1) is more than 160 ℃, its condensation temperature is 80 ℃.
5. low grade residual heat use device comprises:
Absorption direct combustion machine (1) has circulation heating water out (102), circulation heating water inlet (101), circulating frozen water inlet (105), circulating frozen water out (104), exhanst gas outlet (103);
The heating water input branch road (27) that is connected with described circulation heating water inlet (101), the heating water that is connected with described circulation heating water out (102) output branch road (30);
It is characterized in that, also comprise:
The flue gas of discharging from described exhanst gas outlet is carried out the flue gas heat exchange device (4) that sensible heat reclaims, it has first and second heat exchanger channels, wherein the entrance of first heat exchanger channels is communicated with described exhanst gas outlet (103), the entrance of second heat exchanger channels is communicated with described heating water input branch road (27), and the outlet of described second heat exchanger channels is communicated with described heating water output branch road (30);
Flue gas behind the recovery sensible heat is carried out the flue gas condensing formula heat exchanger (3) that latent heat reclaims, it has third and fourth heat exchanger channels, wherein the entrance of the 3rd heat exchanger channels is communicated with the outlet of described first heat exchanger channels, the entrance of the 4th heat exchanger channels is communicated with described circulating frozen water out (104), and the outlet of the 4th heat exchanger channels is communicated with described circulating frozen water inlet (105).
6. according to the device of claim 5, it is characterized in that, also comprise:
Recirculated cooling water heat exchanger (2), it has the 5th and the 6th heat exchanger channels, and the entrance of the 5th heat exchanger channels is communicated with described circulating frozen water out (104), and the outlet of the 5th heat exchanger channels is communicated with described circulating frozen water inlet (105); And
The cooling water input branch road (22) that is communicated with the entrance of described the 6th heat exchanger channels, the cooling water output branch road (23) that is communicated with described the 6th heat exchanger channels outlet.
7. according to the device of claim 6, it is characterized in that, also comprise:
Cross-line (16), the one end is communicated with the outlet of the 4th heat exchanger channels of described flue gas condensing formula heat exchanger (3), and its other end is communicated with the entrance of the 5th heat exchanger channels of described recirculated cooling water heat exchanger (2); And
Be connected the flow through cross-line valve (7) of chilled-water flow of described cross-line (16) of control on the described cross-line (16).
8. device according to claim 7, it is characterized in that, described heating water input branch road (27) is divided into first branch line (28), second branch line, wherein said first branch line (28) is communicated with described circulation heating water inlet (101), and described second branch line is communicated with the entrance of second heat exchanger channels of described flue gas heat exchange device (4).
9. device according to claim 8 is characterized in that,
On described first branch line (28), on described second branch line, be connected with a flow control valve (11,10) respectively.
10. device according to claim 5 is characterized in that,
In the exit of the 3rd heat exchanger channels of described flue gas condensing formula heat exchanger (3), be connected with the blast pipe (26) of discharging for the flue gas that is absorbed behind the latent heat.
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| CN2011104601687A CN103185414A (en) | 2011-12-31 | 2011-12-31 | Method and device utilizing low-grade waste heat |
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| CN2011104601687A CN103185414A (en) | 2011-12-31 | 2011-12-31 | Method and device utilizing low-grade waste heat |
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| US5291841A (en) * | 1993-03-08 | 1994-03-08 | Dykema Owen W | Coal combustion process for SOx and NOx control |
| WO2005093222A2 (en) * | 2003-12-16 | 2005-10-06 | Advanced Combustion Energy Systems, Inc. | Apparatus and method for the production of energy |
| CN101871705A (en) * | 2009-04-24 | 2010-10-27 | 萨曼斯有限公司 | Cooler-heat pump |
| CN101799226A (en) * | 2010-03-02 | 2010-08-11 | 清华大学 | Heat-gaining combined heat and power system |
| CN202547183U (en) * | 2011-12-31 | 2012-11-21 | 新奥科技发展有限公司 | Low-grade waste heat utilization device |
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