CN102827623A - Method and system for recycling waste heat of ammonia water - Google Patents
Method and system for recycling waste heat of ammonia water Download PDFInfo
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- CN102827623A CN102827623A CN2012103299406A CN201210329940A CN102827623A CN 102827623 A CN102827623 A CN 102827623A CN 2012103299406 A CN2012103299406 A CN 2012103299406A CN 201210329940 A CN201210329940 A CN 201210329940A CN 102827623 A CN102827623 A CN 102827623A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- 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
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- Y02P20/00—Technologies relating to chemical industry
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- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention provides a method and a system for recycling waste heat of ammonia water. The method comprises the following steps: circulating circulatory ammonia water into a gas collecting pipe of a coke oven, cooling raw gas for the first time, heating the circulatory ammonia water, feeding the heated circulatory ammonia water into a heat exchange device, and heating the circulating water in the heat exchange device; circulating the circulating water heated in the heat exchange device into a lithium-bromide absorption-type refrigerating machine as a heat source to refrigerate frozen water in the lithium-bromide absorption-type refrigerating machine; meanwhile, circulating a refrigerant into the lithium-bromide absorption-type refrigerating machine; and feeding the cooled circulating water to the heat exchange device and heating again. According to the method provided by the invention, the waste heat in the circulatory ammonia water is effectively recycled and is used for refrigeration, the waste heat recovery rate of the circulatory ammonia water is improved, and the waste of the energy is effectively avoided.
Description
Technical field
The present invention relates to the coking field, relate in particular to a kind of ammoniacal liquor heat recovery method and system.
Background technology
Coal chemical enterprise is an important energy production department, and coking is that coking coal is being heated under the secluding air condition about 1000 ℃, produces the technological process of coke, coke-oven gas and coking chemistry product through high temperature carbonization.In the product after the coking, red-hot coke and raw gas are the condition of high temperature, contain a large amount of heat energy.Therefore; Need raw gas be passed in the coke oven collecting main, and coke oven collecting main is arranged in the ammoniacal liquor circulation loop, ammoniacal liquor is fed in the coke oven collecting main through the ammoniacal liquor recycle pump; Then through in coke oven collecting main, constantly spraying ammoniacal liquor in order to raw gas is lowered the temperature; And then make a large amount of transfer of heat energy that raw gas will carry to cyclic ammonia water, realize the once cooling of raw gas is handled, and then the raw gas after will once lowering the temperature is through carrying out reducing temperature twice in the primary cooler.Therefore but the system that there be limited evidence currently of has the waste heat in pair cyclic ammonia water to reclaim makes the heat energy that carries in the cyclic ammonia water waste, and has caused the waste of the energy.
At present, have a spot of coal chemical enterprise that the cyclic ammonia water waste heat is recycled, its scheme is: cyclic ammonia water is heated with recirculated water heating through heat-exchange equipment, and the heating recirculated water that will pass through heating then supplies heating facilities to use.Though this scheme reclaims the waste heat of cyclic ammonia water and is used for heating, there is following drawback in it:
At first, the cyclic ammonia water waste heat that is recovered to is used for heating, it only just has the value of utilization in the winter time, and coal chemical enterprise is normally produced the whole year, and is therefore lower to cyclic ammonia water heat recovery rate.
Secondly, heating facilities need be configured to each user with the heating circulating water line, and coal chemical enterprise is mostly away from the living quarters, and so, its pipe laying distance is longer, invests excessively, and then most of coal chemical enterprise is not possessed practical significance.
At last, because cyclic ammonia water has certain corrodibility, if cyclic ammonia water leaks to heating recirculated water because of corrosion or other reasons string, can heating user's health be worked the mischief, the safety of its use is not high.
So, how effectively to cyclic ammonia water waste heat recovery in the coking system and be used and just become current urgent problem.
Summary of the invention
One object of the present invention is to provide a kind of ammoniacal liquor heat recovery method, and it reclaims the waste heat in the cyclic ammonia water effectively, and is used for refrigeration, has improved cyclic ammonia water heat recovery rate, has effectively avoided the waste of the energy.
Another object of the present invention is to provide a kind of ammoniacal liquor heat recovery system, and it reclaims the waste heat in the cyclic ammonia water effectively, and is used for refrigeration, has improved cyclic ammonia water heat recovery rate, has effectively avoided the waste of the energy.
The present invention provides a kind of ammoniacal liquor heat recovery method, earlier cyclic ammonia water is fed in the coke oven collecting main, and raw gas is once lowered the temperature, and heating cycle ammoniacal liquor also comprises:
Cyclic ammonia water after the heating is sent in the heat-exchanger rig, and the recirculated water in the said heat-exchanger rig is heated;
Recirculated water after the heating in the said heat-exchanger rig is fed lithium-bromide absorption-type refrigerating machine, the refrigerated water that feeds in the said lithium-bromide absorption-type refrigerating machine is freezed as thermal source; Feed refrigerant to said lithium-bromide absorption-type refrigerating machine simultaneously;
Sending the recirculated water after the cooling back to said heat-exchanger rig reheats.
Optional, the refrigerated water after the refrigeration is sent into primary cooler, raw gas is carried out reducing temperature twice.
Optionally, after the cooling agent of discharging in the said lithium-bromide absorption-type refrigerating machine lowered the temperature, feed again in the said lithium-bromide absorption-type refrigerating machine.
Optional, also comprise in the step of the recirculated water feeding lithium-bromide absorption-type refrigerating machine in said heat-exchanger rig after the heating: recirculated water is carried out the electric conductivity monitoring;
And/or,
Recirculated water after will lowering the temperature is sent back in the step that said heat-exchanger rig reheats and is also comprised: recirculated water is carried out the electric conductivity monitoring.
Optional, the step that the cyclic ammonia water after will heating is sent into heat-exchanger rig also comprises before: utilize low pressure water vapor that the tar deposition that the tar in the cyclic ammonia water forms in said heat-exchanger rig is removed.
The present invention also provides a kind of ammoniacal liquor heat recovery system; Comprise coke oven collecting main and ammoniacal liquor recycle pump; The water outlet of said coke oven collecting main links to each other with the water-in of said coke oven collecting main; And forming first circulation loop, said first circulation loop is provided with said cyclic ammonia water pump, also comprises at least one heat-exchanger rig and lithium-bromide absorption-type refrigerating machine; Wherein,
Be provided with first pipeline and second pipeline in the said heat-exchanger rig, the water outlet of said coke oven collecting main links to each other with the import of said first pipeline, and the water-in of said coke oven collecting main links to each other with the outlet of said first pipeline;
The outlet of said second pipeline links to each other with the hot water inlet of said lithium-bromide absorption-type refrigerating machine 41; The import of said second pipeline links to each other with the hot water outlet of said lithium-bromide absorption-type refrigerating machine 42; And forming second circulation loop, said second circulation loop is provided with water circulating pump 5;
Said lithium-bromide absorption-type refrigerating machine is provided with coolant inlet and coolant outlet, and refrigerant gets into through said coolant inlet, and discharges through said coolant outlet;
Also be provided with refrigerated water import and chilled water outlet on the said lithium-bromide absorption-type refrigerating machine.
Optional, also comprise primary cooler, be provided with the 3rd pipeline in the said primary cooler;
The import of said the 3rd pipeline links to each other with said chilled water outlet, and the outlet of said the 3rd pipeline links to each other with said refrigerated water import, and forms the 3rd circulation loop, and said the 3rd circulation loop is provided with chilled water circulating pump.
Optional, also comprising coolant-circulating equipment, said coolant-circulating equipment comprises cooling tower and coolant pump;
The water outlet of said cooling tower links to each other with said coolant inlet, and the water-in of said cooling tower links to each other with said coolant outlet, and forms the 4th circulation loop, and said the 4th circulation loop is provided with said coolant pump.
Optional, said second circulation loop is provided with electric conductivity detector.
Optional, being connected with the water vapor inlet pipe on said first pipeline, said water vapor inlet pipe links to each other with the low pressure water vapor compressed air source unit.
Compared with prior art; Ammoniacal liquor heat recovery method provided by the invention; Heat in the cyclic ammonia water after it will heat through heat-exchanger rig reclaims, and is used for recirculated water is heated, and the recirculated water after the utilization heating is as thermal source then; Utilize lithium-bromide absorption-type refrigerating machine that refrigerated water is freezed; And through feeding refrigerant to guarantee the works better of lithium-bromide absorption-type refrigerating machine to lithium-bromide absorption-type refrigerating machine simultaneously, the recirculated water after will lowering the temperature is at last sent heat-exchanger rig back to and is reheated, and realizes recycle; Thereby effectively the waste heat in the cyclic ammonia water is reclaimed, and be used for refrigeration, improved cyclic ammonia water heat recovery rate, effectively avoided the waste of the energy.
In further technical scheme, the refrigerated water after it freezes lithium-bromide absorption-type refrigerating machine feeds to primary cooler, and is used for raw gas is carried out reducing temperature twice; Lithium-bromide absorption-type refrigerating machine capable of using substitutes the existing refrigerator that is used for primary cooler is carried out refrigeration cool-down, and then has saved the consumption of existing refrigerator to the energy, has further avoided the consumption of the energy, and energy-saving effect is remarkable.
In further technical scheme, it feeds in the said lithium-bromide absorption-type refrigerating machine after refrigerant of discharging in the lithium-bromide absorption-type refrigerating machine is lowered the temperature again; Realized in lithium-bromide absorption-type refrigerating machine, feeding recirculated cooling water, and then effectively guaranteed normal, the operation continuously of lithium-bromide absorption-type refrigerating machine.
In further technical scheme; When its recirculated water after recirculated water feeds lithium-bromide absorption-type refrigerating machine and will lower the temperature is sent said heat-exchanger rig back to; Recirculated water is carried out electric conductivity monitoring, the electric conductivity of monitoring recirculated water, thus can find in time that cyclic ammonia water leaks the situation to recirculated water because of corrosion or other reasons string; And through shutdown to ammoniacal liquor heat recovery system; Avoid the corrosion of cyclic ammonia water, and then effectively guaranteed lithium-bromide absorption-type refrigerating machine, make its operating safety, reliable lithium-bromide absorption-type refrigerating machine.
In further technical scheme; Before cyclic ammonia water after will heating is sent into heat-exchanger rig; Utilize low pressure water vapor that the tar deposition that the tar in the cyclic ammonia water forms in heat-exchanger rig is effectively cleared up; Can prevent that first pipeline in the heat-exchanger rig from stopping up, and can guarantee the heat exchange efficiency of heat-exchanger rig.
Ammoniacal liquor heat recovery provided by the invention system has corresponding technical characterictic with above-mentioned ammoniacal liquor heat recovery method, thereby produces corresponding technique effect, repeats no more at this.
Description of drawings
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below is embodiments more of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the synoptic diagram that ammoniacal liquor heat recovery method and system of the present invention is shown with the schema mode.
Description of drawings:
The 1-coke oven collecting main; 2-ammoniacal liquor recycle pump; The 3-heat-exchanger rig, 31-first pipeline, 32-second pipeline;
The 4-lithium-bromide absorption-type refrigerating machine, 41-hot water inlet, 42-hot water outlet, the import of 43-refrigerated water, 44-chilled water outlet, 45-coolant inlet, 46-coolant outlet;
The 5-water circulating pump; The 6-primary cooler, 61-the 3rd pipeline; The 7-chilled water circulating pump;
The 8-coolant-circulating equipment, 81-cooling tower, 82-coolant pump;
The 9-electric conductivity detector; 10-water vapor inlet pipe; 11-low pressure water vapor compressed air source unit; The 12-expansion tank.
Embodiment
For making the object of the invention, technical scheme and advantage clearer; To carry out clear, complete description to technical scheme of the present invention below; Based on the embodiment among the present invention; Those of ordinary skills are resulting all other embodiments under the prerequisite of not making creative work, the scope that all belongs to the present invention and protected.
Embodiment one
As shown in Figure 1; The ammoniacal liquor heat recovery method that provides in the present embodiment does; Earlier cyclic ammonia water is fed in the coke oven collecting main 1, raw gas is once lowered the temperature heating cycle ammoniacal liquor; Also comprise: the cyclic ammonia water after will heating is sent in the heat-exchanger rig 3, and the recirculated water in the heat exchanging device 3 heats; Recirculated water after the heating in the heat-exchanger rig 3 is fed lithium-bromide absorption-type refrigerating machine 4, the refrigerated water that feeds in the lithium-bromide absorption-type refrigerating machine 4 is freezed as thermal source; Feed refrigerant to lithium-bromide absorption-type refrigerating machine 4; Sending the recirculated water after the cooling back to heat-exchanger rig 3 reheats.
Heat in the cyclic ammonia water after it will heat through heat-exchanger rig 3 reclaims; And be used for recirculated water is heated; Recirculated water after the utilization heating utilizes 4 pairs of refrigerated waters of lithium-bromide absorption-type refrigerating machine to freeze as thermal source then, and through feeding refrigerants to guarantee the works better of lithium-bromide absorption-type refrigerating machine 4 to lithium-bromide absorption-type refrigerating machine 4; Recirculated water after will lowering the temperature is at last sent heat-exchanger rig 3 back to and is reheated, and realizes recycle; Thereby effectively the waste heat in the cyclic ammonia water is reclaimed, and be used for refrigeration, improved cyclic ammonia water heat recovery rate, effectively avoided the waste of the energy.
In the present embodiment; Because in the process of coking, after utilizing cyclic ammonia water that the carrying out of raw gas once lowered the temperature to handle, the raw gas after also needing once to lower the temperature is through carrying out reducing temperature twice in the primary cooler 6; And primary cooler 6 needs a large amount of refrigerated waters when cooling off; At present, how employing is provided with a refrigerator is used in primary cooler 6, refrigerated water being provided; But existing refrigerator; As electric refrigerating machine (being compressor cooling), Gas Direct-fired refrigerator (being the direct combustion type lithium bromide refrigerator) and steam-refrigerated machine (being the steam type lithium bromide refrigerator) be set; It all need expend the extra energy; Be that electric refrigerating machine needs consume electric power, the Gas Direct-fired refrigerator need expend combustion gas, and steam-refrigerated machine need expend steam; Therefore can the refrigerated water that pass through after lithium-bromide absorption-type refrigerating machine 4 freezes directly be sent in the primary cooler 6, be used for raw gas is carried out reducing temperature twice; Be used for primary cooler 6 is carried out the refrigerator of refrigeration cool-down thereby utilize lithium-bromide absorption-type refrigerating machine 4 to substitute to have now, and then saved the consumption of existing refrigerator to the energy, further avoided the consumption of the energy, energy-saving effect is remarkable.
In the present embodiment, lithium-bromide absorption-type refrigerating machine 4 process of refrigeration are specially: in producer, receive the heating of heat medium water when lithium bromide water solution after, the water in the solution is constantly vaporized; Along with the continuous vaporization of water, the lithium bromide water solution concentration in the producer constantly raises, and gets into resorber; Water vapor gets into condensing surface, condenses after the refrigerant cooling in the device that is condensed, and becomes the liquid water of high pressure low temperature; When the water in the condensing surface gets into vaporizer through throttling valve, rapid expansion and vaporizing, and in vaporescence a large amount of heats that absorb chilled water in the vaporizers, thereby reach cooling refrigerating purpose; In this process, water at low temperature steam gets into resorber, and the lithium bromide water solution that is absorbed in the device absorbs; Strength of solution progressively reduces; Send producer back to by recycle pump again, accomplish full cycle, so; Guarantee normal, the non-stop run of lithium-bromide absorption-type refrigerating machine 4, just need constantly feed refrigerant to it; Therefore; After can the refrigerant of discharging in the lithium-bromide absorption-type refrigerating machine 4 being lowered the temperature; Feed again in the said lithium-bromide absorption-type refrigerating machine 4; And then realize in lithium-bromide absorption-type refrigerating machine 4, feeding circulating coolant, for lithium-bromide absorption-type refrigerating machine 4 provides circulating coolant, thereby guaranteed that effectively the normal, continuous of lithium-bromide absorption-type refrigerating machine 4 moves.
In the present embodiment; Because contain ammonia and other ions in the cyclic ammonia water, it has certain corrodibility, the transfer line of meeting corrosive cycle ammoniacal liquor; If cyclic ammonia water because of the corrosion or the other reasons string leak to recirculated water; Meeting is corroded lithium-bromide absorption-type refrigerating machine 4 even it is damaged, and leaks the situation to recirculated water in order in time to find the cyclic ammonia water string, thereby avoids cyclic ammonia water that lithium-bromide absorption-type refrigerating machine 4 is corroded; Therefore, when the recirculated water after can in heat-exchanger rig 3, heating feeds lithium-bromide absorption-type refrigerating machine 4, and/or; Recirculated water after will lowering the temperature is sent heat-exchanger rig 3 back to when reheating; Recirculated water is carried out the electric conductivity monitoring, and electric conductivity is unusual in finding recirculated water, can shut down and check; Thereby effectively guaranteed lithium-bromide absorption-type refrigerating machine 4, made its operating safety, reliable.
In the present embodiment, because cyclic ammonia water is to accomplish heat-processed when raw gas is lowered the temperature, in this heat-processed; When cyclic ammonia water sprays raw gas; Also can sneak into a certain amount of tar, and tar is prone to attached in first pipeline 31 in the heat-exchanger rig 3, thereby on tube wall, causes deposition; And then the generation blocking problem, the while also can have influence on the heat exchange efficiency of heat-exchanger rig 3; Therefore; Can be before the cyclic ammonia water after will heating be sent into heat-exchanger rig 3 (being before heat-exchanger rig 3 starts); Or cyclic ammonia water stopped to send into after the heat-exchanger rig 3 (also be heat-exchanger rig 3 next times started before); Utilize low pressure water vapor that the tar deposition that the tar in the cyclic ammonia water forms in said heat-exchanger rig 3 is removed, thereby prevent that effectively first pipeline 31 in the heat-exchanger rig 3 from stopping up, and can guarantee the heat exchange efficiency of heat-exchanger rig 3.
Embodiment two
As shown in Figure 1; The ammoniacal liquor heat recovery system that provides in the present embodiment; Comprise coke oven collecting main 1 and ammoniacal liquor recycle pump 2, the water outlet of coke oven collecting main 1 links to each other with the water-in of coke oven collecting main 1, and forms first circulation loop; First circulation loop is provided with the cyclic ammonia water pump, also comprises at least one heat-exchanger rig 3 and lithium-bromide absorption-type refrigerating machine 4; Wherein, be provided with first pipeline 31 and second pipeline 32 in the heat-exchanger rig 3, the water outlet of coke oven collecting main 1 links to each other with the import of first pipeline 31, and the water-in of coke oven collecting main 1 links to each other with the outlet of said first pipeline 31; The outlet of second pipeline 32 links to each other with the hot water inlet 41 of lithium-bromide absorption-type refrigerating machine 4, and the import of second pipeline 32 links to each other with the hot water outlet 42 of lithium-bromide absorption-type refrigerating machine 4, and forms second circulation loop, and second circulation loop is provided with water circulating pump 5; Lithium-bromide absorption-type refrigerating machine 4 is provided with coolant inlet 45 and coolant outlet 46, and refrigerant gets into through said coolant inlet 45, and discharges through said coolant outlet 46; Also be provided with refrigerated water import 43 and chilled water outlet 44 on the lithium-bromide absorption-type refrigerating machine 4.
Its working process is: through ammoniacal liquor recycle pump 2 cyclic ammonia water is fed to coke oven collecting main 1; And the water-in through coke oven collecting main 1 sprays cooling to the raw gas that feeds in the coke oven collecting main 1; Make cyclic ammonia water absorb heat simultaneously; Utilize the water outlet of cyclic ammonia water through coke oven collecting main 1 after the cyclic ammonia water pump will absorb heat to extract and deliver to the import of first pipeline 31 in the heat-exchanger rig 3 out then; And get in the heat-exchanger rig 3, and then discharge and return to the water-in of coke oven collecting main 1 from the outlet of first pipeline 31, thus first circulation loop formed; In heat-exchanger rig 3; Utilize the cyclic ammonia water after the heating in first pipeline 31 that the recirculated waters in second pipeline 32 are heated; Recirculated water after the heating feeds the hot water inlet 41 of lithium-bromide absorption-type refrigerating machine 4 through the outlet of second pipeline 32; And as in the thermal source entering lithium-bromide absorption-type refrigerating machine 4, refrigerated water gets into through the refrigerated water import on the lithium-bromide absorption-type refrigerating machine 4 43, and in lithium-bromide absorption-type refrigerating machine 4, accomplishes process of refrigeration; And the refrigerated water after will freezing is discharged through the chilled water outlet on the lithium-bromide absorption-type refrigerating machine 4 44; Refrigerant gets into through the coolant inlet on the lithium-bromide absorption-type refrigerating machine 4 45, and for the works better of lithium-bromide absorption-type refrigerating machine 4 provides refrigerant, and the coolant outlet 46 from lithium-bromide absorption-type refrigerating machine 4 is discharged; The import of second pipeline 32 is discharged and returned to recirculated water after will lowering the temperature at last through the hot water outlet 42 of lithium-bromide absorption-type refrigerating machine 4, thereby form second circulation loop.It reclaims the waste heat in the cyclic ammonia water effectively, and is used for refrigeration, has improved cyclic ammonia water heat recovery rate, has effectively avoided the waste of the energy.
Wherein heat-exchanger rig 3 can be one and also can be a plurality ofly, and heat-exchanger rig 3 can adopt spiral-plate exchanger, plate-type heat exchanger etc.
In the present embodiment; Because the recirculated water in second circulation loop needs heating; Recirculated water after the heating has certain swell increment, therefore also can in second circulation loop, set up an expansion tank 12, in order to accommodate and to compensate the breathing amount of the recirculated water in second circulation loop; Concrete set-up mode can be: water circulating pump 5 is arranged between the hot water inlet 41 of outlet and lithium-bromide absorption-type refrigerating machine 4 of second pipeline 32; Between the outlet of second pipeline 32 and water circulating pump 5, an expansion tank 12 is set then; So, after recirculated water heats through heat-exchanger rig 3, can be introduced in the expansion tank 12; And the swell increment of recirculated water compensated, and then recirculated water is sent in the lithium-bromide absorption-type refrigerating machine 4 through water circulating pump 5.
In the present embodiment; Because in the process of coking, after utilizing cyclic ammonia water that the carrying out of raw gas once lowered the temperature to handle, the raw gas after also needing once to lower the temperature is through carrying out reducing temperature twice in the primary cooler 6; And primary cooler 6 needs a large amount of refrigerated waters when cooling off; At present, how employing is provided with a refrigerator is used in primary cooler 6, refrigerated water being provided; But existing refrigerator; As electric refrigerating machine (being compressor cooling), Gas Direct-fired refrigerator (being the direct combustion type lithium bromide refrigerator) and steam-refrigerated machine (being the steam type lithium bromide refrigerator) be set; It all need expend the extra energy; Be that electric refrigerating machine needs consume electric power, the Gas Direct-fired refrigerator need expend combustion gas, and steam-refrigerated machine need expend steam; Therefore can the refrigerated water that pass through after lithium-bromide absorption-type refrigerating machine 4 freezes directly be sent in the primary cooler 6, be used for raw gas is carried out reducing temperature twice; Specifically be set to: be provided with the 3rd pipeline 61 in the primary cooler 6; The import of the 3rd pipeline 61 links to each other with chilled water outlet 44, and the outlet of the 3rd pipeline 61 links to each other with refrigerated water import 43, and forms the 3rd circulation loop, and the 3rd circulation loop is provided with chilled water circulating pump 7.
Its working process is: the refrigerated water after lithium-bromide absorption-type refrigerating machine 4 refrigeration is sent in the 3rd pipeline 61 in the primary cooler 6 through chilled water outlet 44; Then primary cooler 6 is carried out refrigeration cool-down, and carry out reducing temperature twice with 6 pairs of raw gas of primary cooler, the outlet of three pipeline 61 of the refrigerated water after will heating up then in the primary cooler 6 returns to refrigerated water import 43; And from newly freezing; And then the formation tertiary circuit, its lithium-bromide absorption-type refrigerating machine 4 capable of using substitutes to have now and is used for primary cooler 6 is carried out the refrigerator of refrigeration cool-down, and then has saved the consumption of existing refrigerator to the energy; Further avoided the consumption of the energy, energy-saving effect is remarkable.
Below just set forth with a specific embodiments, certain large-scale coal chemical enterprise is produced coke 2,000,000 t/a, supporting downstream chemical engineering industry, the about 2100m of cyclic ammonia water amount per year
3/ h, 71.7 ℃ of cyclic ammonia water temperature are used 4 100m
2Spiral-plate heat exchanger extract heat, 71.7 ℃ of cyclic ammonia water inflow temperatures, 70 ℃ of cyclic ammonia water leaving water temperature(LWT)s can extract heat conversion cycle water 667m
3, and be that to be heated to temperature out be 69 ℃ for 63 ℃ recirculated water with inlet temperature; Use one 3,000,000 kilocalorie lithium-bromide absorption-type refrigerating machine, the refrigerated water refrigeration that with the water-in temperature is 23 ℃ is to 16 ℃ of also outputs, and 428.6m can freeze
3Refrigerated water; An and then alternative steam type refrigerator with refrigerating duty; Therefore per hour can practice thrift 4 tons of 0.8MPa steam, move 10 months per year, 160 yuan of calculating of steam per ton; The annual steam expense that can practice thrift 460.8 ten thousand yuan, has application and popularization value preferably at its obvious energy conservation.
In the present embodiment, lithium-bromide absorption-type refrigerating machine 4 process of refrigeration are specially: in producer, receive the heating of heat medium water when lithium bromide water solution after, the water in the solution is constantly vaporized; Along with the continuous vaporization of water, the lithium bromide water solution concentration in the producer constantly raises, and gets into resorber; Water vapor gets into condensing surface, condenses after the refrigerant cooling in the device that is condensed, and becomes the liquid water of high pressure low temperature; When the water in the condensing surface gets into vaporizer through throttling valve, rapid expansion and vaporizing, and in vaporescence a large amount of heats that absorb chilled water in the vaporizers, thereby reach cooling refrigerating purpose; In this process, water at low temperature steam gets into resorber, and the lithium bromide water solution that is absorbed in the device absorbs; Strength of solution progressively reduces; Send producer back to by recycle pump again, accomplish full cycle, so; Guarantee normal, the non-stop run of lithium-bromide absorption-type refrigerating machine 4, just need constantly feed refrigerant to it; Therefore, can in lithium-bromide absorption-type refrigerating machine 4, feed circulating coolant,, thereby guarantee that effectively the normal, continuous of lithium-bromide absorption-type refrigerating machine 4 moves for lithium-bromide absorption-type refrigerating machine 4 provides circulating coolant.Specifically be set to: a coolant-circulating equipment 8 is set, and coolant-circulating equipment 8 comprises cooling tower 81 and coolant pump 82; The water outlet of cooling tower 81 links to each other with coolant inlet 45, and the water-in of cooling tower 81 links to each other with coolant outlet 46, and forms the 4th circulation loop, and the 4th circulation loop is provided with coolant pump 82.
Its working process is: the refrigerant that cooling tower 81 internal cooling are good is delivered to the coolant inlet 45 of lithium-bromide absorption-type refrigerating machine 4 through coolant pump 82; Thereby guarantee the normal operation of lithium-bromide absorption-type refrigerating machine 4; Refrigerant after will in lithium-bromide absorption-type refrigerating machine 4, heating up is then discharged lithium-bromide absorption-type refrigerating machine 4 through coolant outlet 46; And return in the cooling tower 81 and cool off again, thereby form the 4th circulation loop; Realized in lithium-bromide absorption-type refrigerating machine 4, feeding circulating coolant,, thereby guaranteed that effectively the normal, continuous of lithium-bromide absorption-type refrigerating machine 4 moves for lithium-bromide absorption-type refrigerating machine 4 provides circulating coolant.
Wherein, refrigerant can be water coolant, also can be other refrigerants.
In the present embodiment; Because contain ammonia and other ions in the cyclic ammonia water, it has certain corrodibility, the transfer line of meeting corrosive cycle ammoniacal liquor; If cyclic ammonia water because of the corrosion or the other reasons string leak to recirculated water; Meeting is corroded lithium-bromide absorption-type refrigerating machine 4 even it is damaged, and leaks the situation to recirculated water in order in time to find the cyclic ammonia water string, thereby avoids cyclic ammonia water that lithium-bromide absorption-type refrigerating machine 4 is corroded; Therefore, need recirculated water is carried out the electric conductivity monitoring, electric conductivity is unusual in finding recirculated water, can shut down and check, thereby effectively guarantee lithium-bromide absorption-type refrigerating machine 4, makes its operating safety, reliable.Specifically be set to: second circulation loop is provided with electric conductivity detector 9.
Its working process is: utilize the electric conductivity of the recirculated water in 9 pairs second circulation loops of electric conductivity detector to check; When electric conductivity is unusual in finding recirculated water; Lithium-bromide absorption-type refrigerating machine 4 is shut down, thereby the cyclic ammonia water that can effectively avoid going here and there leak to the recirculated water corrodes lithium-bromide absorption-type refrigerating machine 4.
In the present embodiment, because cyclic ammonia water is to accomplish heat-processed when raw gas is lowered the temperature, in this heat-processed; When cyclic ammonia water sprays raw gas; Also can sneak into a certain amount of tar, and tar is prone in the circulation line attached to cyclic ammonia water, thereby on tube wall, causes deposition; And then the generation blocking problem, the while also can have influence on the heat exchange efficiency of heat-exchanger rig 3; Therefore; Can regularly utilize low pressure water vapor that the tar deposition that the tar in the cyclic ammonia water forms in said heat-exchanger rig 3 is removed; Thereby prevent that effectively first circulation loop and heat-exchanger rig 3 from stopping up, and can guarantee the heat exchange efficiency of heat-exchanger rig 3.Specifically be set to: on first pipeline 31, be connected with water vapor inlet pipe 10, and water vapor inlet pipe 10 is linked to each other with low pressure water vapor compressed air source unit 11, further, also need on first pipeline 31 and water vapor inlet pipe 10, valve to be set all.
Its working process does; When unit was worked, the valve that is provided with on the water vapor inlet pipe 10 was in closing condition, behind unit work certain hour; Can first pipeline 31 be closed through valve; Open the valve on the water vapor inlet pipe 10 then, make that the low pressure water vapor in the low pressure water vapor compressed air source unit 11 enters into first pipeline 31, and the tar deposition on the tube wall of first pipeline 31 is cleared up; Thereby prevent that effectively first pipeline 31 from stopping up, and can guarantee the heat exchange efficiency of heat-exchanger rig 3.
Wherein, Because when the tar deposition on the tube wall of first pipeline 31 was cleared up, first pipeline 31 needed to close through valve, thereby the circulation loop of winning can not normally be moved; Can cause cyclic ammonia water can not enter into heat-exchanger rig 3 and carry out heat exchange; And then cause the shutdown of whole unit, and cause unnecessary financial loss, can not make the maximum working efficiency of whole unit performance simultaneously; Therefore, a plurality of heat-exchanger rigs 3 can be set, in the time need clearing up to first pipeline 31 in certain heat-exchanger rig 3 wherein; First pipeline 31 in the heat-exchanger rig 3 that only needs to clear up opens circuit; And clear up through low pressure water vapor and to get final product, but all the other heat-exchanger rigs 3 works better still can not be affected; Therefore can guarantee the normal operation of whole unit, greatly improve its working efficiency.
In the present embodiment, also online TM and online tensimeter can be set in first circulation loop.
Wherein, Online temperature is counted two; Be separately positioned on the pipeline before the import of first pipeline 31 in the heat-exchanger rig 3 with heat-exchanger rig 3 in the outlet of first pipeline 31 after pipeline on; The temperature that is used for the cyclic ammonia water of heat exchanging device 3 front and back is carried out on-line monitoring, is convenient to the temperature of cyclic ammonia water is controlled.
Wherein, Online tensimeter is two; Be separately positioned on the pipeline before the import of first pipeline 31 in the heat-exchanger rig 3 with heat-exchanger rig 3 in the outlet of first pipeline 31 after pipeline on; The pressure that is used for the cyclic ammonia water of heat exchanging device 3 front and back carries out on-line monitoring, is convenient to the hydraulic pressure in the cyclic ammonia water is controlled.
The ammoniacal liquor heat recovery system that provides among the embodiment two can implement the ammoniacal liquor heat recovery method that provides among the embodiment one; But do not represent the ammoniacal liquor heat recovery method that provides among the embodiment one only to realize, also can adopt other modes, system to realize with above-mentioned ammoniacal liquor heat recovery system.
What should explain at last is: above embodiment and embodiment be only in order to explaining technical scheme of the present invention, but not to its restriction; Although the present invention has been carried out detailed explanation with reference to aforementioned embodiments and embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to aforementioned embodiments or technical scheme that embodiment put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the essence disengaging embodiment of the present invention of relevant art scheme or the spirit and the scope of embodiment technical scheme.
Claims (10)
1. an ammoniacal liquor heat recovery method feeds cyclic ammonia water in the coke oven collecting main earlier, and raw gas is once lowered the temperature, and heating cycle ammoniacal liquor is characterized in that, also comprises:
Cyclic ammonia water after the heating is sent in the heat-exchanger rig, and the recirculated water in the said heat-exchanger rig is heated;
Recirculated water after the heating in the said heat-exchanger rig is fed lithium-bromide absorption-type refrigerating machine, the refrigerated water that feeds in the said lithium-bromide absorption-type refrigerating machine is freezed as thermal source; Feed refrigerant to said lithium-bromide absorption-type refrigerating machine simultaneously;
Sending the recirculated water after the cooling back to said heat-exchanger rig reheats.
2. ammoniacal liquor heat recovery method according to claim 1 is characterized in that, the refrigerated water after the refrigeration is sent into primary cooler, and raw gas is carried out reducing temperature twice.
3. ammoniacal liquor heat recovery method according to claim 1 is characterized in that, after the refrigerant of discharging in the said lithium-bromide absorption-type refrigerating machine is lowered the temperature, feeds in the said lithium-bromide absorption-type refrigerating machine again.
4. according to each described ammoniacal liquor heat recovery method of claim 1 to 3, it is characterized in that,
Also comprise in the step of the recirculated water feeding lithium-bromide absorption-type refrigerating machine in said heat-exchanger rig after the heating: recirculated water is carried out the electric conductivity monitoring;
And/or,
Recirculated water after will lowering the temperature is sent back in the step that said heat-exchanger rig reheats and is also comprised: recirculated water is carried out the electric conductivity monitoring.
5. according to each described ammoniacal liquor heat recovery method of claim 1 to 3; It is characterized in that the step that the cyclic ammonia water after will heating is sent into heat-exchanger rig also comprises before: utilize low pressure water vapor that the tar deposition that the tar in the cyclic ammonia water forms is removed in said heat-exchanger rig.
6. ammoniacal liquor heat recovery system; Comprise coke oven collecting main and ammoniacal liquor recycle pump; The water outlet of said coke oven collecting main links to each other with the water-in of said coke oven collecting main, and forms first circulation loop, and said first circulation loop is provided with said cyclic ammonia water pump; It is characterized in that, also comprise at least one heat-exchanger rig and lithium-bromide absorption-type refrigerating machine; Wherein,
Be provided with first pipeline and second pipeline in the said heat-exchanger rig, the water outlet of said coke oven collecting main links to each other with the import of said first pipeline, and the water-in of said coke oven collecting main links to each other with the outlet of said first pipeline;
The outlet of said second pipeline links to each other with the hot water inlet of said lithium-bromide absorption-type refrigerating machine; The import of said second pipeline links to each other with the hot water outlet of said lithium-bromide absorption-type refrigerating machine; And forming second circulation loop, said second circulation loop is provided with water circulating pump;
Said lithium-bromide absorption-type refrigerating machine is provided with coolant inlet and coolant outlet, and refrigerant gets into through said coolant inlet, and discharges through said coolant outlet;
Also be provided with refrigerated water import and chilled water outlet on the said lithium-bromide absorption-type refrigerating machine.
7. ammoniacal liquor heat recovery according to claim 6 system is characterized in that, also comprises primary cooler, is provided with the 3rd pipeline in the said primary cooler;
The import of said the 3rd pipeline links to each other with said chilled water outlet, and the outlet of said the 3rd pipeline links to each other with said refrigerated water import, and forms the 3rd circulation loop, and said the 3rd circulation loop is provided with chilled water circulating pump.
8. ammoniacal liquor heat recovery according to claim 6 system is characterized in that also comprise coolant-circulating equipment, said coolant-circulating equipment comprises cooling tower and coolant pump;
The water outlet of said cooling tower links to each other with said coolant inlet, and the water-in of said cooling tower links to each other with said coolant outlet, and forms the 4th circulation loop, and said the 4th circulation loop is provided with said coolant pump.
9. according to each described ammoniacal liquor heat recovery system of claim 6 to 8, it is characterized in that said second circulation loop is provided with electric conductivity detector.
10. according to each described ammoniacal liquor heat recovery system of claim 6 to 8, it is characterized in that be connected with the water vapor inlet pipe on said first pipeline, said water vapor inlet pipe links to each other with the low pressure water vapor compressed air source unit.
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| CN2012103299406A CN102827623A (en) | 2012-09-07 | 2012-09-07 | Method and system for recycling waste heat of ammonia water |
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| CN2012103299406A CN102827623A (en) | 2012-09-07 | 2012-09-07 | Method and system for recycling waste heat of ammonia water |
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| CN103629854A (en) * | 2013-10-28 | 2014-03-12 | 大连理工大学 | Ammonia and lithium bromide integrated absorption refrigeration device driven by heating medium water and method |
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| CN109253558A (en) * | 2018-03-19 | 2019-01-22 | 华洋通信科技股份有限公司 | A kind of cyclic ammonia water UTILIZATION OF VESIDUAL HEAT IN refrigeration unit automatic back-flushing device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103629854A (en) * | 2013-10-28 | 2014-03-12 | 大连理工大学 | Ammonia and lithium bromide integrated absorption refrigeration device driven by heating medium water and method |
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| CN104214990A (en) * | 2014-08-20 | 2014-12-17 | 河南中鸿集团煤化有限公司 | Raw coke oven gas sensible heat recovery cold water preparing system and raw coke oven gas sensible heat recovery cold water preparing method |
| CN104214990B (en) * | 2014-08-20 | 2016-05-11 | 河南中鸿集团煤化有限公司 | A kind of coal oven dithio-gas sensible heat reclaims water refrigeration system and method |
| CN106766342A (en) * | 2016-12-12 | 2017-05-31 | 松下制冷（大连）有限公司 | Ammonia still process column overhead ammonia vapour residual heat system is reclaimed using lithium bromide absorption type heat pump |
| CN109253558A (en) * | 2018-03-19 | 2019-01-22 | 华洋通信科技股份有限公司 | A kind of cyclic ammonia water UTILIZATION OF VESIDUAL HEAT IN refrigeration unit automatic back-flushing device and method |
| CN109253558B (en) * | 2018-03-19 | 2021-02-26 | 华洋通信科技股份有限公司 | Automatic back flushing device and method for refrigerating unit utilizing waste heat of circulating ammonia water |
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Application publication date: 20121219 |