CN103335446B - Low-grade heat source obtains joint refrigeration technique and the device of cold - Google Patents
Low-grade heat source obtains joint refrigeration technique and the device of cold Download PDFInfo
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- CN103335446B CN103335446B CN201310200522.1A CN201310200522A CN103335446B CN 103335446 B CN103335446 B CN 103335446B CN 201310200522 A CN201310200522 A CN 201310200522A CN 103335446 B CN103335446 B CN 103335446B
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Abstract
The present invention relates to joint refrigeration technique and device that a kind of low-grade heat source obtains cold, solving large-scale Coal Chemical Engineering Project middle-low grade thermal source cannot utilize, and is unfavorable for the problem of saving energy and reduce the cost.Technique is that gaseous refrigerant forms liquid refrigerant feeding cold-producing medium groove after condensation, and the some liquid refrigerant that described cold-producing medium groove flows out sends into evaporimeter and hot fluid carries out heat exchange gasification, for hot fluid provides cold; Another part liquid refrigerant that described cold-producing medium groove flows out sends into gasifier through refrigerated medium pump, the low-grade heat source gasification be passed in gasifier, produce high-pressure gaseous refrigerant, gaseous refrigerant after gasification is sprayed into by the second gaseous refrigerant import of injector, the gaseous refrigerant after cold that provides flowed out by evaporimeter is sucked by the first gaseous refrigerant import, in injector after adherence pressure, then send into condenser condenses after mixing with the gaseous refrigerant from compressor.Present invention process is simple, energy-saving and cost-reducing, equipment investment and running cost low.
Description
Technical field
The present invention relates to a kind of large-scale Coal Chemical Engineering Project, a kind of refrigeration process middle-low grade thermal source obtains joint refrigeration technique and the device of cold specifically.
Background technology
12 planning are using energy-saving and emission-reduction as important goal, and current Coal Chemical Engineering Project is towards maximization development, and energy-saving and emission-reduction task is still severe.The comprehensive utilization of large-scale Coal Chemical Engineering Project low-grade heat source is one of main path reducing energy consumption, for synthetic ammonia urea, the 0.35MPa G that device by-product is a large amount of, the saturated vapor of 145 DEG C and saturated vapor condensate liquid, this part low-grade heat source can not make full use of and extremely waste, and does not also meet the target that national energy-saving reduces discharging.Large-scale Coal Chemical Engineering Project needs the cold of a large amount of different brackets, as the compression refrigeration of synthetic ammonia urea project general obtains the cold of different brackets, as normal gas ammonia after evaporator heat exchange need by sending into condenser condenses after compressor compresses again, compression refrigeration is caused to need to consume a large amount of high-grade steam, and the low-grade steam of by-product and saturated vapor condensate liquid cannot make full use of, cause capacity usage ratio low, be unfavorable for saving energy and reduce the cost.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, the joint refrigeration technique that a kind of technique is simple, effectively can utilize low-grade heat source, energy-saving and cost-reducing low-grade heat source acquisition cold is provided.
The present invention also provides few, the stable low-grade heat source of simple, easy and simple to handle, the dynamic equipment of a kind of structure for above-mentioned technique to obtain the associated refrigerating plant of cold.
Apparatus of the present invention comprise the condenser, cold-producing medium groove and the evaporimeter that connect successively, the gaseous refrigerant outlet of described evaporimeter is connected with the first gaseous refrigerant import of injector, cold-producing medium groove is connected with the second gaseous refrigerant import of injector through refrigerated medium pump, gasifier, and the outlet of described injector is connected with condenser.
The fixed gas outlet of described condenser is also connected with cold-producing medium groove.
Described injector is in parallel more than 2.
A kind of low-grade heat source obtains the joint refrigeration technique of cold, comprise the following steps, gaseous refrigerant from compressor forms liquid refrigerant and sends into cold-producing medium groove after condenser condenses, the some liquid refrigerant that described cold-producing medium groove flows out sends into evaporimeter and hot fluid carries out heat exchange gasification, for hot fluid provides cold, exported by the gaseous refrigerant of evaporimeter after gasification and flow out; Another part liquid refrigerant that described cold-producing medium groove flows out sends into gasifier through refrigerated medium pump, the low-grade heat source gasification be passed in gasifier, produce high-pressure gaseous refrigerant, high-pressure gaseous refrigerant after gasification is sprayed into by the second gaseous refrigerant import of injector, the gaseous refrigerant after cold that provides flowed out by evaporimeter is sucked by the first gaseous refrigerant import, in injector after adherence pressure ejection, then send into condenser condenses after mixing with the gaseous refrigerant from compressor.
The fixed gas that described condenser is drawn sends into cold-producing medium groove.
Low-grade heat source in described introducing gasifier is pressure 0.1 ~ 0.5MPa G, the saturated vapor that temperature is 120 ~ 159 DEG C or saturated vapor condensate liquid.
The pressure controlling the outlet of described injector is identical with the pressure of the gaseous refrigerant from compressor.
The described cold grade obtained can adjust between-10 DEG C ~ 10 DEG C, can provide the cold of multiple grade, can arrange several injectors in parallel according to specific needs, to obtain the cold of different brackets.
In large-scale Coal Chemical Engineering Project, a large amount of low-grade heat source low-pressure steam of by-product or saturated vapor condensate liquid, this low-grade heat source can not be fully used.Large-scale Coal Chemical Engineering Project needs the cold of different brackets (being generally-40 DEG C to-10 DEG C ~ 10 DEG C), this cold provides by by compression refrigeration, compression refrigeration can consume a large amount of high-grade high steam, and low-grade heat source (as low-pressure steam or full or steam condensate) cannot make full use of.
The described gaseous refrigerant from compressor can be ammonia, propylene, and other cold-producing medium such as ethene, refrigeration process is often applied to the large-scale Coal Chemical Engineering Projects such as coal synthesis ammonia, ammonia from coal, coal liquifaction, coal preparing natural gas and coal-ethylene glycol.Due to all a large amount of low-grade heat source of by-product in this kind of technique, and need the cold providing different brackets, therefore this kind of technique is all applicable to the present invention.
The present invention utilizes low-grade heat source, utilize ejector refrigeration principle to provide the cold of-10 DEG C ~ about 10 DEG C, while abundant Appropriate application low-grade heat source, has saved high-grade high steam, has reached energy-saving and emission-reduction, the object of comprehensive energy utilization.Apparatus of the present invention structure is simple, flexible operation is easy, preparation is invested and operating cost is low, system reliability is good; Present invention process is simple, running cost is low, fully can use the low-grade heat source of by-product, energy-saving and cost-reducing, environmentally friendly.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representation and process chart.
Wherein, 1-cold-producing medium groove, 2-gasifier, 3-injector, the 3.1-the second gaseous refrigerant import, the 3.2-the first gaseous refrigerant import, 3.3-outlet, the outlet of 4-condenser, 4.1-fixed gas, the outlet of 5-evaporimeter, 5.1-gaseous refrigerant, 6-refrigerated medium pump.
Detailed description of the invention
Below in conjunction with accompanying drawing, explanation is further explained to apparatus of the present invention:
With reference to Fig. 1, condenser 4, cold-producing medium groove 1 and evaporimeter 5 connect successively, the low-pressure gaseous refrigerant outlet 5.1 of described evaporimeter 5 is connected with the second gaseous refrigerant import 3.1 of injector 3, cold-producing medium groove 1 is connected with the second gaseous refrigerant import 3.1 of injector 3 through refrigerated medium pump 6, gasifier 2, and the outlet 3.3 of described injector 3 is connected with condenser 4.The fixed gas outlet 4.1 of described condenser 4 is also connected with cold-producing medium groove 1.Described gasifier 2, evaporimeter 5 and condenser 4 are indirect heat exchange type.The heat transferring medium of described gasifier 2 is low-grade heat source (as 0.35MPa G, the saturated vapor of 145 DEG C, being called for short low-pressure steam), and in described evaporimeter 5, heat transferring medium is hot fluid, and the heat transferring medium in described condenser is the processing medium needing cooling.
Being further explained explanation for synthetic ammonia urea technique to present invention process below, is ammonia at the invention process such as middle cold-producing medium:
1, the laggard gasifier 2 of 5MPa G is forced into by liquefied ammonia (pressure is 1.5MPa G, and temperature the is 40 DEG C) part of cold-producing medium groove 1 through refrigerated medium pump 6; Part sends into evaporimeter 5 and hot fluid heat exchange, discharges cold fluid (temperature is-10 ~ 10 DEG C) for user and provide cold after heat exchange; Part removes urea plant; Remainder goes user at different levels.
2, low-pressure steam (145 DEG C, the saturated vapor of 0.35MPa G) vaporized device 2, by liquid ammonia gasification, obtain the gas ammonia (namely pressure is 5.0MPa G, temperature is the high-pressure gaseous refrigerant of 90 DEG C) with power steam, the steam condensate after heat exchange discharges recycling by gasifier 2.
3, the gas ammonia obtained in step 2 sprays into injector 3 by the second gaseous refrigerant import 3.1, gaseous refrigerant outlet 5.1 gas ammonia after cold (pressure is 0.19 ~ 0.51MPa G temperature is-10 ~ 10 DEG C) that provides out by evaporimeter 5 is sucked injector 3 by the first gaseous refrigerant import 3.2, by its pressure-raising to 1.5 MPa G, (pressure is 1.5 MPa G to gas ammonia after dilatation, temperature is 60 ~ 75 DEG C) through exporting 3.3 discharges, (pressure is 1.5 MPa G with providing the gas ammonia of low-temperature rectisol-40 DEG C of colds from compressor, temperature is 110 DEG C) mixing, form mixing gas ammonia.
5, described mixing gas ammonia enters condenser 4 condensation, and condensed liquefied ammonia (pressure is 1.5MPaG temperature is 40 DEG C) enters cold-producing medium groove 1; The fixed gas obtained exports 4.1 by not condenser and enters cold-producing medium groove 1 and reclaim ammonia, and the ammonia be not recovered in cold-producing medium groove 1 is discharged by top and entered next step operation (as removing periodic off-gases cooler), and cooling reclaims ammonia further.
Pressure in the present embodiment can according to actual needs and the pressure requirements of device adjust, not and be defined in above-mentioned numerical value.Described flowed out by cold-producing medium groove 1 the internal circulating load entering the liquefied ammonia of refrigerated medium pump, cold-producing medium groove flow out the internal circulating load entering evaporimeter 5 and all (as pressure requirements, temperature requirement, cold grade etc.) appropriate design can be carried out according to the actual needs from the amount of the gas ammonia of compressor, here be not particularly limited, with the temperature met the demands, pressure and equivalent grade as well.
By the low-grade heat source that present invention process can utilize the Coal Chemical Engineering Project of Large-scale Ammonia Plant urea to produce fully, avoid directly discharging the heat-energy losses and environmental problem brought, also save original technique for providing the consumption of high-grade steam required for cold, there is significant economic effect.To produce the Coal Chemical Engineering Project of synthetic ammonia urea of 50 tons per year, adopt present invention process can utilize the low-pressure steam of 150,000 tons every year, save the consumption of the high-grade steam of 6.9 ten thousand tons, operating cost can reduce about 5,520,000 yuan.
Claims (4)
1. the associated refrigerating plant of a low-grade heat source acquisition cold, comprise the condenser, cold-producing medium groove and the evaporimeter that connect successively, it is characterized in that, the gaseous refrigerant outlet of described evaporimeter is connected with the first gaseous refrigerant import of injector, cold-producing medium groove is connected with the second gaseous refrigerant import of injector through refrigerated medium pump, gasifier, the outlet of described injector is connected with condenser, the fixed gas outlet of described condenser is connected with cold-producing medium groove, and the top of described cold-producing medium groove is connected with periodic off-gases cooler.
2. low-grade heat source as claimed in claim 1 obtains the associated refrigerating plant of cold, it is characterized in that, described injector is in parallel more than 2.
3. the joint refrigeration technique of a low-grade heat source acquisition cold, comprise the following steps, gaseous refrigerant from compressor forms liquid refrigerant and sends into cold-producing medium groove after condenser condenses, the some liquid refrigerant that described cold-producing medium groove flows out sends into evaporimeter and hot fluid carries out heat exchange gasification, for hot fluid provides cold, exported by the gaseous refrigerant of evaporimeter after gasification and flow out, another part liquid refrigerant that described cold-producing medium groove flows out sends into gasifier through refrigerated medium pump, the low-grade heat source gasification be passed in gasifier, produce high-pressure gaseous refrigerant, high-pressure gaseous refrigerant after gasification is sprayed into by the second gaseous refrigerant import of injector, the gaseous refrigerant after cold that provides flowed out by evaporimeter is sucked by the first gaseous refrigerant import of injector, in injector after adherence pressure ejection, condenser condenses is sent into after mixing with the gaseous refrigerant from compressor again, the fixed gas that described condenser is drawn sends into cold-producing medium groove, the cold-producing medium be not recovered in described cold-producing medium groove discharges periodic off-gases cooler by top, cooling reclaims cold-producing medium further, the pressure controlling the outlet of described injector is identical with the pressure of the gaseous refrigerant from compressor.
4. low-grade heat source as claimed in claim 3 obtains the joint refrigeration technique of cold, it is characterized in that, the low-grade heat source introduced in gasifier is pressure 0.1 ~ 0.5MPa G, the saturated vapor that temperature is 120 ~ 159 DEG C or saturated vapor condensate liquid.
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| CN103335446B true CN103335446B (en) | 2015-08-12 |
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| JP6343156B2 (en) * | 2014-02-26 | 2018-06-13 | 荏原冷熱システム株式会社 | Compression refrigerator |
| CN103821700B (en) * | 2014-03-10 | 2016-02-03 | 苟仲武 | A kind of energy-conservation compressed air plant and preparation method thereof |
| CN112268376A (en) * | 2020-09-15 | 2021-01-26 | 珠海格力电器股份有限公司 | Fluorine pump type heat pipe and jet refrigeration cycle composite system and control method thereof |
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| CN202709543U (en) * | 2012-02-08 | 2013-01-30 | 中能东讯新能源科技(大连)有限公司 | Jet type refrigeration heat pump unit with waste heat as drive heat source |
| CN203375762U (en) * | 2013-05-27 | 2014-01-01 | 中国五环工程有限公司 | Combined cooling device with low-grade heat source obtaining cooling capacity |
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| CA2671914A1 (en) * | 2009-07-13 | 2011-01-13 | Zine Aidoun | A jet pump system for heat and cold management, apparatus, arrangement and methods of use |
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| CN202709543U (en) * | 2012-02-08 | 2013-01-30 | 中能东讯新能源科技(大连)有限公司 | Jet type refrigeration heat pump unit with waste heat as drive heat source |
| CN203375762U (en) * | 2013-05-27 | 2014-01-01 | 中国五环工程有限公司 | Combined cooling device with low-grade heat source obtaining cooling capacity |
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