CN102895843B - System for recycling waste heat produced by methyl-diethanolamine (MDEA) decarburization process by using ultra high temperature heat pump - Google Patents
System for recycling waste heat produced by methyl-diethanolamine (MDEA) decarburization process by using ultra high temperature heat pump Download PDFInfo
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- CN102895843B CN102895843B CN201210361764.4A CN201210361764A CN102895843B CN 102895843 B CN102895843 B CN 102895843B CN 201210361764 A CN201210361764 A CN 201210361764A CN 102895843 B CN102895843 B CN 102895843B
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Abstract
The invention discloses a system for recycling waste heat produced by a methyl-diethanolamine (MDEA) decarburization process by using an ultra high temperature heat pump. The system mainly comprises two procedures of MDEA decarburization and ultra high temperature heat pump working media. In the system, an evaporator of an ultra high temperature heat pump unit replaces original cooling water to decrease the temperature of a barren solution of the decarburization process to a required temperature, and the cooled barren solution absorbs CO2 of process gases; and a condenser of the ultra high temperature heat pump unit replaces original high temperature vapor. According to the system for recycling the waste heat produced by the MDEA decarburization process by using the ultra high temperature heat pump, by means of an ultra high temperature heat pump technology, technical bottlenecks of temperature limitation of original high temperature heat pumps are broken through, and recycling ranges of low temperature waste heat are greatly expanded. The ultra high temperature blending working media are used, and the waste heat produced by the MDEA decarburization process is utilized so that energy qualities are improved to meet requirements of high temperature heat required when an MDEA decarburization solution is regenerated. By means of the system, energy utilization ratios of the process are improved, and good energy-saving and economical effects are achieved.
Description
Technical field
The invention belongs to heat pump and decarburization chemical process technical field, be related specifically to superhigh temperature heat pump and combine the technology and device that utilize with MDEA decarbonization process.
Background technology
Synthetic ammonia power consumption accounts for 40% of chemical industry total amount, is one of large high energy-consuming industry of China's chemical industry five.In Ammonia Production, decarbonization process energy consumption is approximately 10% ~ 15% of total energy consumption.So it is very large that decarbonization process can save energy space.Activative MDEA decarburization is the external BASF exploitation seventies and industrialization technology.This decarbonization process technology have degree of purification high, can simultaneously few, the regeneration CO of desulfurization and decarburization, nitrogen hydrogen loss amount
2gas purity is high, solvent loss is few, the not easily advantage such as degraded.But MDEA decarbonization process belongs to high energy consumption technique in numerous decarbonization process, during with technics comparing such as PSA, PC, steam consumption, power consumption etc. are all in a disadvantageous position.Under the overall background of energy-saving and emission-reduction, the energy consumption problem of MDEA decarbonization process is urgently to be resolved hurrily.
The decarburization of MDEA method utilizes MDEA solution cryogenic absorption CO exactly
2, elevated temperature desorption CO
2principle to realize.Under the condition of low temperature, the CO in activative MDEA solution absorption technique gas
2, absorb CO
2mDEA solution be called rich solution.Under the condition of high temperature, CO
2parse from MDEA solution, solution is regenerated simultaneously, discharges CO
2mDEA solution be called lean solution.Environmental condition in conventional process flow needed for realization, adopt cooling water high temperature rich solution to be down to the temperature (being down to 50 DEG C ~ 65 DEG C for about 80 DEG C) of demand, the MDEA solution after cooling removes the CO of absorption technique gas
2, adopt high-temperature steam heating MDEA solution (about 75 DEG C rise to about 105 DEG C), make it regenerate.In former technological process, the heat in cooling water is dispersed into air by cooling tower, not only needs to configure corresponding equipment, also needs to consume the running that the high-quality such as electric energy can realize equipment, and the waste heat of this part does not utilize, and also needs on the contrary to consume a large amount of energy; In addition, in the process of MDEA regeneration of waste liquor, need again to consume a large amount of primary energy and produce steam for heating MDEA solution.This just means in MDEA decarbonization process flow process and not only consumes a large amount of energy, and its waste heat is not utilized by rationally effective.
How adequately and reasonably being utilized by the waste heat in MDEA decarbonization process flow process, promoting can matter quality, and the high-quality heat energy of generation is back to use in MDEA decarbonization process flow process again, is one of the mode that should actively seek of MDEA decarbonization process.So not only greatly reduce the energy consumption of MDEA decarburization, and environmental pollution and thermal pollution can be reduced.One of heat pump techniques effective technology means realizing this purpose just.The waste heat of MDEA decarbonization process is converted into high potential by heat pump techniques, the MDEA solution in the high potential thermal regeneration process of generation, and cost is only high-grade energy (electric energy, mechanical energy etc.) consuming small amount.So both can replace the equipment such as the cooling tower of former technique, and make full use of waste heat in technique, original steam can be replaced again, reduce the consumption of the fossil fuels such as coal, indirectly improve the energy utilization rate of industrial flow.In general, the heat production temperature of high temperature heat pump is more than 65 DEG C, and but below 100 DEG C, but in the MDEA solution reclaiming process of this technique, the high temperature of demand is 105 DEG C, and therefore traditional high temperature heat pump is difficult to meet this process requirements.
Summary of the invention
In order to solve problems of the prior art, the invention provides a kind of system adopting superhigh temperature heat pump to recycle MDEA decarbonization process waste heat, the low grade residual heat solved in MDEA decarbonization process flow process cannot utilize, and needs again to consume a large amount of primary energy and produces steam for heating the problem of resource waste of MDEA solution.
Technical scheme of the present invention is as follows:
Adopt superhigh temperature heat pump to recycle a system for MDEA decarbonization process waste heat, be coupled to form primarily of MDEA decarburization and superhigh temperature heat pump fluid two flow processs:
(1) MDEA decarburization flow process
The circulatory system that MDEA decarburization flow process comprises regenerator successively, condenser, evaporimeter, lean pump, absorption tower, flash column, solution heat exchanger are interconnected composition; The lean solution (about 105 DEG C) regenerated in regenerator enters solution heat exchanger, release partial heat, lean solution (about 80 DEG C) after cooling enters evaporimeter again, release heat, the lean solution that temperature is down to 50 DEG C ~ 65 DEG C enters the top on absorption tower after lean pump pressurization, the CO in the lean solution absorption technique gas in absorption tower
2, absorb CO
2mDEA solution become rich solution; Enter the top of flash column after rich solution decompression bottom absorption tower, liquid from top to bottom with steam and the CO of regenerator
2gaseous mixture counter current contacting, absorbs steam and CO
2the heat of gaseous mixture, after packing layer, the CO of part in rich solution
2parse, rich solution becomes semi lean solution; The semi lean solution going out flash column is divided into two parts, wherein delivers to the middle part on absorption tower after most of semi lean solution pressurization, enters solution heat exchanger, the heat of recovery section lean solution after the pressurization of another part semi lean solution; Semi lean solution after intensification enters the top of regenerator, through packing layer with steam from bottom to top and CO
2gaseous mixture enters into condenser together, absorbs heat within the condenser, and the temperature of semi lean solution rises to about 105 DEG C by about 75 DEG C, and the semi lean solution after intensification returns regenerator, parses the CO in solution
2, become lean solution, recycle;
(2) superhigh temperature heat pump fluid flow process
Superhigh temperature heat pump fluid flow process mainly comprises compressor, expansion valve, condenser, evaporimeter and superhigh temperature heat pump fluid; High temperature liquid refrigerant expands through expansion valve and reduces pressure and temperature, the cold-producing medium of low-temp low-pressure enters evaporimeter, absorb the waste heat of lean solution and gasify, the low pressure refrigerant of gasification enters compressor and compresses, the cold-producing medium of exhaust outlet of compressor becomes high-temperature high-pressure state, and the cold-producing medium of HTHP enters condenser condenses heat release and liquefies, the MDEA decarbonizing solution in condensation heat thermal regeneration process, make it reach technological requirement, the cold-producing medium of liquefaction enters expansion valve circular flow again.
Described high temperature refrigerant is mix refrigerant BY-4.Commodity are called northeast part of China 4# cold-producing medium, and producer is cold-producing medium factory of University Of Tianjin.
In this system, the evaporimeter of superhigh temperature source pump replaces original cooling water, and the lean solution temperature of decarbonization process dropped to and require temperature, the lean solution after cooling removes the CO of absorption technique gas
2; The condenser of superhigh temperature source pump replaces original high-temperature steam, meets the demand of MDEA solution reclaiming process to high-quality heat.
The invention has the beneficial effects as follows: the present invention proposes a kind of system and the device that adopt superhigh temperature heat pump recycling MDEA decarbonization process waste heat, the lift technique of UTILIZATION OF VESIDUAL HEAT IN and energy grad is organically combined with MDEA decarbonization process.In this system and device, not only reclaimed by the low temperature exhaust heat produced in MDEA decarbonization process, and improve the energy matter quality of waste heat by superhigh temperature heat pump, the high-grade heat of generation meets the heat demand of MDEA regeneration of waste liquor in technique.In the process, superhigh temperature heat pump has higher Energy Efficiency Ratio (more than 3.5).Generally speaking, not only decrease the application of cooling water in traditional handicraft, also reduce waste heat and be discharged into the thermal pollution produced in air, in addition, the high-temperature hot produced again can for MDEA regeneration of waste liquor, decrease the use of high-temperature steam in former technique, thus the consumption of fossil fuel and the discharges of a large amount of pernicious gas such as the coal decreasing generation steam and cause.This system not only increases the energy utilization rate of technological process, also has well energy-conservation, economic effect.
The superhigh temperature heat pump techniques that the present invention adopts breaches the technical bottleneck of original high temperature heat pump temperature limiting, extends the recycling scope of low temperature exhaust heat greatly.Adopt superhigh temperature mixed working fluid, utilize the waste heat that MDEA decarbonization process process produces, promote energy matter quality, to meet the high-temperature hot of needs when MDEA decarbonizing solution regenerates.
Accompanying drawing explanation
Fig. 1 is that the present invention adopts superhigh temperature heat pump to recycle the process chart of the system of MDEA decarbonization process waste heat;
Wherein 1---absorption tower; 2---flash column; 3---solution heat exchanger; 4---regenerator; 5---condenser; 6---compressor; 7---expansion valve; 8---evaporimeter; 9---lean pump.
Detailed description of the invention
The MDEA decarbonization process that the system of superhigh temperature heat pump recycling MDEA decarbonization process waste heat and device are used for Gansu enterprise is carried out instance analysis, and coupling system flow chart 1 is stated.
In this example, in regenerator 4, the lean solution (105 DEG C) of regeneration enters solution heat exchanger 3, and release partial heat, temperature reduces to 80 DEG C.The lean solution of 80 DEG C enters evaporimeter 8, and in evaporimeter 8, the temperature of lean solution drops to 60 DEG C, and then lean solution gets back to lean pump 9 import, squeezes into the CO in the absorption technique gas of absorption tower 1
2, lean solution becomes rich solution.Rich solution enters steam and the CO of flash column 2 and regenerator 4
2gaseous mixture counter current contacting absorbs heat, parses part CO by the rich solution of flash column 2
2, rich solution becomes semi lean solution.Semi lean solution is divided into two parts, delivers to the middle part on absorption tower 1 after most of semi lean solution pressurization; Enter solution heat exchanger 3 after the pressurization of another part semi lean solution, absorb heat, the semi lean solution after intensification enters regenerator 4 top, enters into condenser 5 with steam from bottom to top together with CO2 gaseous mixture.Semi lean solution enters absorption condensation heat in condenser 5, and temperature rises to 105 DEG C by 75 DEG C.Then, the semi lean solution after intensification returns regenerator 4, parses the CO in solution
2, become lean solution, recycle.This example adopts superhigh temperature source pump by the exhaust-heat absorption of lean solution, decreases the quantity of circulating water of cooling water in former scheme, reduces operating cost and the cost of equipment of cooling water; The high-temperature hot that train condenser end produces, in order to the MDEA decarbonizing solution of thermal regeneration, instead of the heating of high-temperature steam in former scheme.
The cold-producing medium BY-4 of HTHP enters condenser 5, semi lean solution in refrigerant liquefaction condensation heat release heating MDEA decarbonization process in condenser 5, then cold-producing medium BY-4 enters expansion valve 7, in expansion valve 7, the temperature and pressure of cold-producing medium all reduces, the cold-producing medium BY-4 of low-temp low-pressure enters evaporimeter 8, absorbs the heat of lean solution in MDEA decarbonization process and gasifies; The low pressure refrigerant of gasification enters compressor 6 and compresses, and the high-pressure refrigerant after compression enters condenser circular flow.
It is 3.5, MDEA decarbonizing solution flow 170m that the COP of this programme moderate and high temperature heat guards value
3/ h, specific heat capacity 1.29kcal/ (kg DEG C).Can be calculated: the waste heat 4491.3kW of lean solution, intensification calorific requirement 3725.17kW during the regeneration of MDEA decarbonizing solution, press full up foot to calculate for technique intensification heat 3725.17kW demand, the source pump of 1064KW need be set up, heat pump need absorb waste heat 2660kW, can absorb the heat of about half from lean solution cooling.Annual economic benefit can reach more than 100 ten thousand yuan, in addition, also has good environmental benefit and energy-saving effect.Through conversion, mark more than 2200 ton, coal can be saved every year, CO
2cER more than 4900 ton, SO
2cER more than 150 ton, NO
xcER is more than 70 ton.
In general, the waste heat total amount of lean solution cooling is more, as long as go out absorption portion waste heat from lean solution, just can meet the heat needed for technique intensification.So unabsorbed lean solution waste heat still needs to adopt cooling water to cool, but the water yield of cooling water is but far smaller than the cooling water water yield in former technique, thus reduces the power consumption of cooling water circulation and reduce the costs of equipment such as cooling tower.In addition, superhigh temperature heat pump can also be utilized all to be utilized by the waste heat of lean solution, the high-temperature hot part produced is used for the heat demand of MDEA regeneration of waste liquor, rich high-quality heat also can be used for heating, domestic hot-water or other technological process etc., can save a large amount of high-quality energy, reduce discharge and the thermal pollution of a large amount of pernicious gases that primary energy burning produces.
Although by reference to the accompanying drawings to invention has been foregoing description; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; when not departing from present inventive concept and claim institute protection domain, can also make a lot of distortion, these all belong to the row of protection of the present invention.
Claims (1)
1. adopt superhigh temperature heat pump to recycle a technique for MDEA decarbonization process waste heat, it is characterized in that, be coupled to form primarily of MDEA decarburization and superhigh temperature heat pump fluid two flow processs:
(1) MDEA decarburization flow process
The circulatory system that MDEA decarburization flow process comprises regenerator successively, condenser, evaporimeter, lean pump, absorption tower, flash column, solution heat exchanger are interconnected composition; The lean solution regenerated in regenerator enters solution heat exchanger, and release partial heat, the lean solution after cooling enters evaporimeter again, releases heat, after lean pump pressurization, then enters the top on absorption tower, the CO in the lean solution absorption technique gas in absorption tower
2, absorb CO
2mDEA solution become rich solution; Enter the top of flash column after rich solution decompression bottom absorption tower, liquid from top to bottom with steam and the CO of regenerator
2gaseous mixture counter current contacting, absorbs steam and CO
2the heat of gaseous mixture, after packing layer, the CO of part in rich solution
2parse, rich solution becomes semi lean solution; The semi lean solution going out flash column is divided into two parts, wherein delivers to the middle part on absorption tower after most of semi lean solution pressurization, enters solution heat exchanger, the heat of recovery section lean solution after the pressurization of another part semi lean solution; Semi lean solution after intensification enters the top of regenerator, through packing layer with steam from bottom to top and CO
2gaseous mixture enters into condenser together, absorbs heat within the condenser, and the temperature of semi lean solution raises, and the semi lean solution after intensification returns regenerator, parses the CO in solution
2, become lean solution, recycle;
(2) superhigh temperature heat pump fluid flow process
Superhigh temperature heat pump fluid flow process mainly comprises compressor, expansion valve, condenser, evaporimeter and superhigh temperature heat pump fluid; High temperature liquid refrigerant expands through expansion valve and reduces pressure and temperature, the cold-producing medium of low-temp low-pressure enters evaporimeter, absorb the waste heat of lean solution and gasify, the low pressure refrigerant of gasification enters compressor and compresses, the cold-producing medium of exhaust outlet of compressor becomes high-temperature high-pressure state, and the cold-producing medium of HTHP enters condenser condenses heat release and liquefies, the MDEA decarbonizing solution in condensation heat thermal regeneration process, make it reach technological requirement, the cold-producing medium of liquefaction enters expansion valve circular flow again.
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| CN201210361764.4A CN102895843B (en) | 2012-09-24 | 2012-09-24 | System for recycling waste heat produced by methyl-diethanolamine (MDEA) decarburization process by using ultra high temperature heat pump |
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| CN201210361764.4A CN102895843B (en) | 2012-09-24 | 2012-09-24 | System for recycling waste heat produced by methyl-diethanolamine (MDEA) decarburization process by using ultra high temperature heat pump |
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| CN104974115B (en) * | 2014-04-02 | 2017-01-25 | 中国石油化工股份有限公司 | System and method for removing light components out of EO-enriched absorption water by EO/EG device |
| CN103977683A (en) * | 2014-04-30 | 2014-08-13 | 天津大学 | Method and device for reducing regeneration energy consumption of decarburization absorption liquid |
| CN104006568A (en) * | 2014-05-06 | 2014-08-27 | 江苏华昌化工股份有限公司 | New method for applying lithium bromide refrigerating device in nitrogenous fertilizer production |
| CN109027994B (en) * | 2018-07-18 | 2023-08-29 | 华北电力大学 | Coal-fired power generation system utilizing boiler flue gas waste heat, decarbonizing waste heat and absorption heat pump |
| CN115920601A (en) * | 2022-11-14 | 2023-04-07 | 河南中烟工业有限责任公司 | Moisture removing device for back-burning flue gas of boiler |
| CN117771892B (en) * | 2024-02-27 | 2024-06-04 | 安徽普泛能源技术有限公司 | System and coupling machine for thermally-driven carbon capture pressure boosting and refrigeration deep coupling |
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| CN101612512A (en) * | 2008-06-25 | 2009-12-30 | 苏庆泉 | Carbon dioxide separating system and separation method |
| CN101854988A (en) * | 2007-11-09 | 2010-10-06 | 环球油品有限责任公司 | Separator with multi-stage heat pump compressor and intermediate reboiler |
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| EP2509703A4 (en) * | 2009-12-09 | 2014-01-22 | Univ Regina | Alcohol-based gas stripping process |
| JP5468562B2 (en) * | 2011-02-17 | 2014-04-09 | バブコック日立株式会社 | Coal fired boiler system with carbon dioxide recovery system |
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| CN101854988A (en) * | 2007-11-09 | 2010-10-06 | 环球油品有限责任公司 | Separator with multi-stage heat pump compressor and intermediate reboiler |
| CN101612512A (en) * | 2008-06-25 | 2009-12-30 | 苏庆泉 | Carbon dioxide separating system and separation method |
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