CN102989264A - Afterheat recovery coupling system in high-temperature heat pump technology and cuprammonia refining process - Google Patents
Afterheat recovery coupling system in high-temperature heat pump technology and cuprammonia refining process Download PDFInfo
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- CN102989264A CN102989264A CN201210361763XA CN201210361763A CN102989264A CN 102989264 A CN102989264 A CN 102989264A CN 201210361763X A CN201210361763X A CN 201210361763XA CN 201210361763 A CN201210361763 A CN 201210361763A CN 102989264 A CN102989264 A CN 102989264A
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Abstract
The invention discloses an afterheat recovery coupling system in a high-temperature heat pump technology and a cuprammonia refining process. The afterheat recovery coupling system mainly comprises a cuprammonia circulation system and a high-temperature heat pump working medium circulation system, wherein the original two-stage cooling of cooling water and liquid ammonia is replaced by an evaporator of a heat pump unit; the temperature of high-temperature cuprammonia in the copper washing process is decreased to required temperature; the original high-temperature steam is replaced by a condenser of the heat pump unit; and requirements of high-quality heat in the regeneration process are satisfied. According to the afterheat recovery coupling system disclosed by the invention, the energy grade improving technology and the synthesis ammonia chemical process are organically coupled; low-grade afterheat generated by a cuprammonia solution in the copper washing process can be recovered; furthermore, cuprammonia is heated to meet the temperature condition in the regeneration process; the system has a relatively high energy-efficiency ratio; the energy consumption caused by the operation of equipment, such as a cooling tower fan and ammonia refrigeration equipment in the traditional process, is reduced; furthermore, the environmental thermal pollution is also reduced; generated high-temperature heat can also be recycled by the cuprammonia; and the consumption of fossil fuel, such as coal, and the emission of a large amount of harmful gas are reduced.
Description
Technical field
The invention belongs to the technical field of heat pump and synthetic ammonia refinery practice, particularly adopt high temperature heat pump to recycle the system of cuprammonia refinery practice waste heat.
Background technology
Synthetic ammonia is one of large high energy-consuming industry of five in China's chemical industry, and its power consumption accounts for 40% of chemical industry total amount.Analyze in its production process and can adopt which power-saving technology and equipment, the break-through skill bottleneck, exploitation correlation technique and equipment, and carry out organic coupling utilization with ammonia synthesis process, be high resource, high energy consumption, high pollution sexual type Ammonia Production industry energy-conservation key issue in the urgent need to address.
The production of synthetic ammonia mainly comprises unstripped gas manufacturing, raw material gas purifying and three operations of ammonia synthesis.The raw material gas purifying operation refer to from the synthetic ammonia coarse raw materials gas of unstripped gas manufacturing process through desulfurization, conversion, decarburization, refining process, remove impurity in the unstripped gas to satisfy the requirement of synthetic ammonia.The cuprammonia absorption process is one of normal fining process that adopts of synthetic ammonia, comprises that mainly copper is washed and two processes of regenerating.The process that copper is washed needs to carry out under cryogenic conditions, and the regeneration technology flow process needs to carry out under hot conditions.Traditional handicraft is in order to create suitable environmental condition, and the cuprammonia temperature of utilizing cooling water and ammonia refrigeration that copper is washed process high temperature drops to and requires temperature (being down to 8 ℃-15 ℃ for 65 ℃-70 ℃); Regenerative process then need be used a large amount of steam equal energy source Heated Copper ammoniacal liquors, makes it reach uniform temperature condition (rising to about 80 ℃ about 70 ℃).See that thus whole process energy consumption is very big, show not only to be equipped with cooling tower with the dissipation of heat of cooling water in air, need provide electric energy to supply with blower fan of cooling tower and Ammonia Refrigerating Equipment running, and will consume a large amount of energy to produce regenerative process steam.And copper is washed the waste heat of process and is not unexpectedly obtained any utilization, becomes on the contrary the process that consumes the energy.
Analyze the cuprammonia refining process, exist the low-quality waste heat (65 ℃-70 ℃) that the copper process of washing is emitted, also exist regenerative process to the demand of high-quality heat (about 80 ℃).If the waste heat quality-improving can be produced high-order thermal source reuse, then just can solve the demand of this technique, greatly the degree energy savings can reduce again the pollution that brings because of the primary energy use.
Heat pump is as a kind of efficient heat-collecting and promote the device of heat, to consume a small amount of high mass-energy (mechanical energy, electric energy etc.) or high potential temperature heat energy as cost, by thermodynamic cycle, with heat energy by the low-grade high-grade that rises to.Not only can reduce the required fossil fuels such as coal of heat supply, can indirectly improve again the energy utilization rate of industrial flow.But the heat temperature levels that conventional heat pump can produce (about 45 ℃) is lower, and the temperature conditions that this technique regenerative process needs is about 80 ℃, therefore utilizes conventional heat pump to address this problem.
The high temperature heat pump technology that the present invention adopts has then overcome water temperature or the lower shortcoming of wind-warm syndrome that the conventional heat pump technology provides, adopt high temperature refrigerant, the waste heat that can utilize copper to wash process satisfies the requirement of regenerative process in the ammonia synthesis process, both substituted high-quality thermal source, and also saved and cooled off the Energy input that copper is washed process waste heat.But how that high temperature heat pump technology and cuprammonia refinery practice process is organic in conjunction with carrying out systematization and deviceization, be still the bottleneck that exists on the technology, the present invention intends proposing a cover high temperature heat pump technology and cuprammonia refinery practice process waste heat recycling coupled system and device, so that solution to be provided.
Summary of the invention
In order to solve problems of the prior art, the invention provides the recycling coupled system of waste heat recovery in a kind of high temperature heat pump technology and the cuprammonia refinery practice process, solve the low-quality waste heat waste that the copper process of washing is emitted, regenerative process expends that the wasting of resources that causes greatly and primary energy use and the problem of the pollution that brings to the energy demand of high-quality heat.
Technical scheme of the present invention is as follows:
The coupled system of waste heat recovery in a kind of high temperature heat pump technology and the cuprammonia refinery practice mainly comprises two circulatory systems of cuprammonia and high temperature heat pump working medium:
The cuprammonia circulatory system comprises that mainly copper is washed and two processes of regenerating:
The copper process of washing refers to: the copper liquid after regenerator regeneration enters heat exchanger and emits the part heat, 65 ℃-70 ℃ of copper liquid after the cooling enter evaporimeter, copper liquid temperature in evaporimeter drops to 8 ℃-15 ℃, the copper liquid that goes out evaporimeter is got back to high pressure copper pump, squeezes into CO, CO in the copper tower absorption synthetic ammonia coarse raw materials gas
2, O
2, H
2The assorted gas such as S;
Regenerative process refers to: the copper liquid that has absorbed assorted gas in the copper tower flows into the reflux column top after decompression, with reverse contact of copper liquid regeneration gas, the ammonia in the absorption and regeneration gas and steam; Copper liquid is got back to two sections of reflux columns after entering heat exchanger recovery section heat, further resolves on the one hand CO and CO in the copper liquid in tower
2, the on the other hand ammonia of absorption and regeneration gas and heat; The copper liquid that goes out behind the reflux column enters reductor, recycles the heat of other technique workshop section, and the temperature of copper liquid rises, and the cuprammonia solution of intensification enters condenser again, continues to be heated; The copper liquid that goes out condenser enters regenerator again, maintains the fixed temperature condition, to guarantee CO and CO
2Resolve fully, thereby copper liquid is regenerated, recycle;
The high temperature heat pump duplex matter system mainly comprises evaporimeter, condenser, compressor, expansion valve and high temperature refrigerant; Cold-producing medium reduces pressure and temperature through expansion valve, and the cold-producing medium of low-temp low-pressure enters evaporimeter, absorbs the waste heat in the cuprammonia refinery practice and gasifies; The low pressure refrigerant of gasification enters compressor and compresses, and the high-pressure refrigerant after the compression enters condenser, the copper liquid in the cold-producing medium liquefaction condensation heat release thermal regeneration process, and the cold-producing medium of liquefaction enters expansion valve circular flow again.
Described high temperature refrigerant is BY-3.The commodity northeast part of China by name 3# cold-producing medium, producer is cold-producing medium factory of University Of Tianjin.
The extraction that described evaporimeter takes secondary or three grades of heat exchange to carry out heat refers to that high temperature heat pump units at different levels only have evaporimeters at different levels (cuprammonia solution side) to connect in the mode of series connection, condenser (copper liquid side) connects with parallel way, and other component parts is separate.As shown in the figure, cuprammonia solution (65 ℃-70 ℃) enters first evaporator 7a cooling rear (about 38 ℃), enter again and continue cooling among the secondary evaporimeter 7b, its temperature is dropped to require temperature (8 ℃-15 ℃), condenser connects with parallel way, temperature rises to 70 ℃ of copper liquid parts and enters first-stage condenser 4a, remainder enters secondary condenser 4b, copper liquid absorption condensation heat in condenser rises to 80 ℃, the copper flow quantity that enters condenser comes adjust flux according to the temperature requirements of vaporizer side, and three grades of heat exchange in like manner.
The copper liquid that goes out in the described cuprammonia circulatory system regenerative process behind the reflux column is 55 ℃, enter reductor, recycle the heat of other technique workshop section, the temperature of copper liquid rises to 70 ℃, the cuprammonia solution that heats up enters condenser again, continues to be heated, and is warming up to 80 ℃, the copper liquid that goes out condenser enters regenerator again, and the time of staying reaches 45 minutes.
In this flow process, the evaporimeter of source pump replaces the cooling of original cooling water and liquefied ammonia secondary, and the cuprammonia temperature that copper is washed process high temperature drops to and requires temperature; The condenser of source pump replaces original high-temperature steam, satisfies regenerative process to the demand of high-quality heat.In this system and device, high temperature heat pump absorbs copper, and to wash the waste heat of process cuprammonia more, except satisfying the demand of cuprammonia regenerative process to high-quality heat, the high-quality heat of rich part also, this part high-quality heat can heating, domestic hot-water or other technological process etc., can save a large amount of high-quality energy, reduce discharging and the thermal pollution of a large amount of pernicious gases that the primary energy burning produces.
The invention has the beneficial effects as follows: recycling coupled system and the device of waste heat recovery in the high temperature heat pump technology that the present invention proposes and the cuprammonia refinery practice process, carried out organic coupling with energy grade lift technique and synthetic ammonia chemical process.Not only recyclable cuprammonia solution is washed the low grade residual heat that produces in the process at copper, and cuprammonia is heated to temperature conditions in the regenerative process, and has higher Energy Efficiency Ratio, at least more than 3.5.Totally it seems, not only reduced the energy consumption that the equipment operation such as blower fan of cooling tower and ammonia refrigeration causes in the traditional handicraft, also reduced the thermal pollution of environment; The high warm of generation can for cuprammonia regeneration, have been reduced the consumption of the fossil fuels such as coal and the discharging of a large amount of pernicious gases again.This system has not only improved the energy utilization rate of technological process, and is energy-conservation, economic effect is all very remarkable.
Simultaneously, the present invention will expand the recycling scope of low temperature exhaust heat greatly, alternative production process heat supply, heating system heat supply etc.Be steam 94454t/h such as China's central heating heat capacity in 2008 only, hot water 305695MW, if utilize high temperature heat pump to reclaim a large amount of Low Temperature Thermals that exist, be used for heat supply and technological process etc., can save discharging and the thermal pollution of a large amount of pernicious gases of a large amount of high-quality energy, reduction primary energy burning generation.
Description of drawings
Fig. 1 is the process chart of high temperature heat pump of the present invention and cuprammonia refinery practice heat recovery coupled system;
Wherein 1---the copper tower; 2---reflux column; 3---reductor; 4a---first-stage condenser; 4b---secondary condenser; 5---regenerator; 6---heat exchanger; 7a---one-level evaporimeter; 7b---secondary evaporimeter; 8---the copper pump; 9a a---stage compressor; 9b---split-compressor; 10a---one-level expansion valve; 10b---compound expansion valve.
The specific embodiment
The cuprammonia refinery practice that the coupled system of high temperature heat pump and the heat recovery of cuprammonia refinery practice is used for Gansu Ammonia Production enterprise carries out instance analysis, and combined process flow chart 1 is explained.
Copper liquid in this example after regenerator regeneration enters heat exchanger 6 and emits the part heat, 68 ℃ copper liquid enters respectively one-level evaporimeter 7a and secondary evaporimeter 7b, make temperature drop to 10 ℃, then copper liquid is got back to 8 imports of high pressure copper pump, squeezes into cuprammonium washing tower for removing CO 1 and absorbs assorted gas in the synthetic ammonia coarse raw materials gas.Then copper liquid enters reflux column 2 absorbing heats, enter reductor 3 after the intensification, the copper liquid temperature that enters reductor 3 is 55 ℃, 70 ℃ of copper liquid parts that go out reductor 3 enter first-stage condenser 4a, remainder enters secondary condenser 4b, continue to be heated, the condensation heat temperature of copper liquid absorption refrigeration agent BY-3 rises to 80 ℃.80 ℃ copper liquid enters regenerator 5, fully CO and the CO in the desorb copper liquid
2Regenerated, recycled.This example adopts source pump with the exhaust-heat absorption of copper liquid, has saved the cooling water of cooling tower in the former scheme and equipment and the operating cost of liquefied ammonia secondary cooling; The high warm cuprammonia solution in order to thermal regeneration that the unit condenser end produces has replaced the heating of high-temperature steam in the former scheme.
The cold-producing medium BY-3 of HTHP enters first-stage condenser 4a and secondary condenser 4b, copper liquid in the cold-producing medium liquefaction condensation heat release thermal regeneration process in the condenser, then cold-producing medium BY-3 enters one-level expansion valve 10a and compound expansion valve 10b, the temperature and pressure of cold-producing medium all reduces in expansion valve, the cold-producing medium BY-3 of low-temp low-pressure enters one-level evaporimeter 7a and secondary evaporimeter 7b, absorbs the waste heat in the cuprammonia refinery practice and gasifies; The low pressure refrigerant of gasification enters a stage compressor 9a and split-compressor 9b compresses, and the high-pressure refrigerant after the compression enters condenser circular flow.
The COP of this programme moderate and high temperature heat is conservative, and value is 3.5, the flow 100m of copper liquid
3/ h, specific heat capacity 0.9kcal/ (kg ℃).Can be calculated: absorb waste heat 6058.1kW, the high warm 8481.3kW of generation is used for cuprammonia regeneration 1044.5kW, but the demands such as rich heat 7436.8kW domestic hot-water supply or heat supply in winter.Annual economic benefit can reach more than 336 ten thousand yuan, in addition, also has good environmental benefit and energy-saving effect.Through conversion, can save more than 6500 ton in mark coal every year, CO
2More than 14000 ton of CER, SO
2More than 440 ton of CER, nitride CER are more than 210 ton.
In addition, cuprammonia is washed in the process at copper in this programme, and temperature drop is larger, and the one-level heat exchange is not enough to extract institute and has surplus heat, and should take secondary even three grades of heat exchange to carry out the extraction of heat; High temperature heat pump is more from the low temperature exhaust heat that cuprammonia absorbs, and the high warm of heat pump generation gone back the heat of rich part with after the cuprammonia regeneration, can be with this part high-quality heat heating, domestic hot-water or other technological process etc.
Although by reference to the accompanying drawings the present invention has been carried out foregoing description; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; in the situation that does not break away from aim of the present invention 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 (4)
1. the coupled system of waste heat recovery in a high temperature heat pump technology and the cuprammonia refinery practice is characterized in that, mainly comprises two circulatory systems of cuprammonia and high temperature heat pump working medium:
The cuprammonia circulatory system comprises that mainly copper is washed and two processes of regenerating:
The copper process of washing refers to: the copper liquid after regenerator regeneration enters heat exchanger and emits the part heat, 65 ℃-70 ℃ of copper liquid after the cooling enter evaporimeter, copper liquid temperature in evaporimeter drops to 8 ℃-15 ℃, the copper liquid that goes out evaporimeter is got back to high pressure copper pump, squeezes into the assorted gas in the copper tower absorption synthetic ammonia coarse raw materials gas;
Regenerative process refers to: the copper liquid that has absorbed assorted gas in the copper tower flows into the reflux column top after decompression, with reverse contact of copper liquid regeneration gas, the ammonia in the absorption and regeneration gas and steam; Copper liquid is got back to two sections of reflux columns after entering heat exchanger recovery section heat, further resolves on the one hand CO and CO in the copper liquid in tower
2, the on the other hand ammonia of absorption and regeneration gas and heat; The copper liquid that goes out behind the reflux column enters reductor, recycles the heat of other technique workshop section, and the temperature of copper liquid rises, and the cuprammonia solution of intensification enters condenser again, continues to be heated; The copper liquid that goes out condenser enters regenerator again, maintains the fixed temperature condition, to guarantee CO and CO
2Resolve fully, thereby copper liquid is regenerated, recycle;
The high temperature heat pump duplex matter system mainly comprises evaporimeter, condenser, compressor, expansion valve and high temperature refrigerant; Cold-producing medium reduces pressure and temperature through expansion valve, and the cold-producing medium of low-temp low-pressure enters evaporimeter, absorbs the waste heat in the cuprammonia refinery practice and gasifies; The low pressure refrigerant of gasification enters compressor and compresses, and the high-pressure refrigerant after the compression enters condenser, the copper liquid in the cold-producing medium liquefaction condensation heat release thermal regeneration process, and the cold-producing medium of liquefaction enters expansion valve circular flow again.
2. the coupled system of waste heat recovery in described high temperature heat pump technology and the cuprammonia refinery practice according to claim 1 is characterized in that described high temperature refrigerant is BY-3.
3. the coupled system of waste heat recovery in described high temperature heat pump technology and the cuprammonia refinery practice according to claim 1, it is characterized in that, described evaporimeter takes 2 grades or 3 grades of heat exchange to carry out the extraction of heat, high temperature heat pump units at different levels only have evaporimeters at different levels to connect in the mode of series connection, condenser connects with parallel way, and other component parts is separate.
4. the coupled system of waste heat recovery in described high temperature heat pump technology and the cuprammonia refinery practice according to claim 1, it is characterized in that, the copper liquid that goes out in the described cuprammonia circulatory system regenerative process behind the reflux column is 55 ℃, enters reductor, recycles the heat of other technique workshop section, the temperature of copper liquid rises to 70 ℃, the cuprammonia solution that heats up enters condenser again, continues to be heated, and is warming up to 80 ℃, the copper liquid that goes out condenser enters regenerator again, and the time of staying reaches 45 minutes.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418211A (en) * | 2013-08-23 | 2013-12-04 | 湖北宜化化工股份有限公司 | Process and device for heat utilization of high-pressure temperature-regulation water in shell side of high pressure scrubber in production in urea steam stripping method |
| CN103922283A (en) * | 2013-08-25 | 2014-07-16 | 贵州兴化化工股份有限公司 | Cleaning purification method of copper tower outlet gas in refining process |
| CN109027994A (en) * | 2018-07-18 | 2018-12-18 | 华北电力大学 | Utilize residual heat from boiler fume, decarburization waste heat and absorption heat pump coal generating system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103418211A (en) * | 2013-08-23 | 2013-12-04 | 湖北宜化化工股份有限公司 | Process and device for heat utilization of high-pressure temperature-regulation water in shell side of high pressure scrubber in production in urea steam stripping method |
| CN103922283A (en) * | 2013-08-25 | 2014-07-16 | 贵州兴化化工股份有限公司 | Cleaning purification method of copper tower outlet gas in refining process |
| CN109027994A (en) * | 2018-07-18 | 2018-12-18 | 华北电力大学 | Utilize residual heat from boiler fume, decarburization waste heat and absorption heat pump coal generating system |
| 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 |
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Application publication date: 20130327 |