CN102980023B - Liquid ammonia vaporization method - Google Patents
Liquid ammonia vaporization method Download PDFInfo
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- CN102980023B CN102980023B CN201210476489.0A CN201210476489A CN102980023B CN 102980023 B CN102980023 B CN 102980023B CN 201210476489 A CN201210476489 A CN 201210476489A CN 102980023 B CN102980023 B CN 102980023B
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- ammonia
- reboiler
- vaporizer
- heat exchange
- heating agent
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Abstract
The invention discloses a liquid ammonia vaporization method. The liquid ammonia vaporization method is mainly used for solving the problems that equipment is subjected to water attack, the surface of a heat exchange pipe is frosted and the heat exchange efficiency is reduced due to the vaporization of liquid ammonia. The liquid ammonia vaporization method comprises the following steps: heating vapor enters a reboiler tube pass from a vapor port and heats a heat medium in a reboiler after being subjected to heat exchange with the heat exchange pipe, and water produced through vapor condensation flows out of the reboiler; the heat medium is heated to vaporize and becomes heat medium gas after being subjected to heat exchange, the heat medium gas rises into an vaporizer, heats a vaporizer tube pass and is condensed into heat medium liquid after being subjected to heat exchange with ammonia in the vaporizer tube pass, and the heat medium liquid flows into the reboiler; and liquid ammonia enters the vaporizer tube pass and is vaporized into gaseous ammonia after receiving heat supplied by the heat medium gas, and the gaseous ammonia is discharged from the outlet of the vaporizer tube pass.
Description
Technical field
The invention belongs to chemical technology field, be specifically related to a kind of gasification method of liquefied ammonia.
Background technique
Industrial liquid ammonia changes the process of gaseous ammonia into, is widely used in the industries such as chemical plant installations, refrigeration, heat treatment.In aminating reaction, often use gaseous ammonia, ammonia is mainly by liquefied ammonia heater via heating liquefied ammonia, makes it vaporization, keeps needed pressure.
In prior art, liquid ammonia vaporization provides thermal source by electric heating water heating for vaporizer respectively, by vaporizer, industrial liquid ammonia is vaporized.The vaporization heat of ammonia is 327.3 kcal/kg.In industrial production, ammonia vaporization need to absorb amount of heat.In the time of vaporization gas production off-design value, ammonia vaporizer there will be serious water hammer.In the time of steam or hot water circuit deficiency, airborne water is caught a cold frosting in ammonia heater heat exchanging tube appearance, and the thermal resistance of heat exchange increases, reduction of heat exchange efficiency.Meanwhile, the heat exchanging tube internal-external temperature difference of ammonia vaporizer is larger, and equipment easily produces fatigue, and operating security is poor, and while being subject to vapor pressure fluctuation, ammonia pressure is carried unstable, more difficult continous-stable operation.
Summary of the invention
The defect or the deficiency that exist for background technique, the object of the invention is to, and a kind of liquid ammonia vaporization method is provided, and the method can abatement apparatus water hammer, and ammonia pressure is carried stable, and can continous-stable operation.
In order to realize above-mentioned task, the present invention takes following technical solution:
A gasification method for liquefied ammonia, the equipment of employing comprises the reboiler and the vaporizer that are connected, it is characterized in that, according to the following steps operation:
1) heating steam is entered to reboiler tube side by steam port, heat the heating agent in reboiler after heat exchanging tube heat exchange, the water that steam-condensation generates flows out reboiler;
2) the heating agent vaporization of being heated becomes heating agent gas, and rises in vaporizer after heat exchange, and heating agent gas-heated ammonia vaporizer tube side and is condensed into heating agent liquid after ammonia heat exchange in ammonia vaporizer tube side, then flows in reboiler;
3) enter vaporizer tube side from extraneous liquefied ammonia, accept to be vaporized into gaseous ammonia after heat that heating agent gas provides, gaseous ammonia is discharged by the outlet of vaporizer tube side, directly control ammonia gas flow and pressure by regulating valve, and with steam regulation valve door formation control loop, indirectly control the heat exchange amount of reboiler, maintain ammonia continous-stable and discharge.
Above-mentioned heating agent can be dimethoxymethane, methyl alcohol, ethanol, can be also propylene, butylene, dimethyl ether, can also be pentane, hexane or HCFC-134a, fluorine Lyons and the substitute materials thereof such as HCFC-125.
Above-mentioned vaporizer can be one, also can connect multiple vaporizers.
The gasification method of liquefied ammonia of the present invention has the following advantages:
1) adopt dimethoxymethane, methyl alcohol, ethanol etc. as the thermal medium in reboiler, the liquid hit phenomenon of steam condensation water and formation condition thereof while having eliminated liquid ammonia vaporization;
2) avoid airborne water to catch a cold frosting in ammonia heater heat exchanging tube appearance, avoided heat exchange thermal resistance to increase, made full use of heat exchange efficiency;
3) vaporizer has dwindled heat exchanging tube internal-external temperature difference, can ensure the Security of equipment, by controlling vapor pressure fluctuation, maintains ammonia continous-stable and discharges.
Brief description of the drawings
Fig. 1 is liquid ammonia vaporization process flow diagram of the present invention.
Mark in accompanying drawing represents respectively:
1, reboiler, comprising: 10, reboiler housing, 11, reboiler tube bank, 12, steam inlet, 13, steam condensation water outlet, 14, reboiler bobbin carriage, 15, reboiler heating agent steam (vapor) outlet, 16, the import of reboiler heating agent liquid;
2, vaporizer, comprising: 20, vaporizer shell, 21, vaporizer tube bank, 22, vaporizer bobbin carriage, 23, liquefied ammonia import, 24, ammonia steam (vapor) outlet, 25, the outlet of vaporizer heating agent, 26, the import of vaporizer heating agent; 31, steam regulation valve, 32, ammonia modulating valve, 4,5,6,7,8,9 are pipeline.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment
Referring to Fig. 1, according to technological scheme of the present invention, the equipment of employing comprises reboiler and vaporizer, and reboiler 1 comprises reboiler housing 10, reboiler tube bank 11 and reboiler bobbin carriage 14.Vaporizer 2 comprises vaporizer shell 20, vaporizer tube bank 21, vaporizer bobbin carriage 22.Reboiler 1 is connected by pipeline 5, pipeline 6 with vaporizer 2.
Hot steam from pipeline 7 is controlled by steam regulation valve 31, then enters reboiler tube bank 11 through reboiler steam import 12; Be dimethoxymethane from the heating agent liquid of pipeline 4 and pipeline 5, heating agent liquid from pipeline 4 enters reboiler 1 by reboiler heating agent liquid import 16, after hot steam and the heat exchange of heating agent liquid dimethoxymethane in reboiler tube bank 11, steam condensation water exports 13 by steam condensation water and flows out reboiler through pipeline 8;
Heating agent liquid dimethoxymethane is vaporized into dimethoxymethane overheated gas in reboiler tube bank 11, from reboiler heating agent steam (vapor) outlet 15 process pipelines 6, enter vaporizer 2 by vaporizer heating agent import 26, liquefied ammonia from pipeline 9 enters vaporizer tube bank 21 through liquefied ammonia import 23, after the interior liquefied ammonia heat exchange of the heating agent dimethoxymethane gas of vaporizer 2 and tube bank, the heating agent liquid of vaporizer 2 interior condensations through vaporizer heating agent outlet 25, enters pipeline 5 and is circulated to reboiler 1 again.After liquefied ammonia in ammonia vaporizer tube bank 21 and the heating agent gas converting heat of vaporizer, be vaporized into gaseous ammonia, gaseous ammonia enters pipeline 19 through vaporizer ammonia steam (vapor) outlet 24, directly control ammonia gas flow and pressure by regulating valve 32, and with steam pipe line 7 on steam regulation valve door 31 formation control loops, guarantee continous-stable is supplied steam and is controlled the heat exchange amount of reboiler, maintains ammonia continous-stable and discharges.
Be the embodiment that inventor provides below, the invention is not restricted to these embodiments.
Embodiment 1:
2.0MPa steam enters reboiler tube side with 643kg/h by steam port, heats the dimethoxymethane in reboiler after heat exchanging tube heat exchange, and the water that steam condensation generation is 106 DEG C flows out reboiler with 643kg/h; By dimethoxymethane, with the 536kg/h vaporization of being heated, being heated to temperature is 65 DEG C, becomes dimethoxymethane gas after heat exchange, and rise in vaporizer, dimethoxymethane gas-heated vaporizer tube side, and is condensed into heating agent liquid after ammonia heat exchange in vaporizer tube side, then flows in reboiler;
Enter vaporizer tube side from extraneous liquefied ammonia with 1360kg/h, accept to be vaporized into gaseous ammonia after heat that heating agent gas provides, 52 DEG C of temperature, pressure 1.0MPa, gaseous ammonia is discharged with 1360kg/h flow by vaporizer tube side outlet, directly controls ammonia gas flow and pressure by regulating valve, and with steam regulation valve door formation control loop, indirectly control the heat exchange amount of reboiler, maintain ammonia continous-stable and discharge.
Embodiment 2:
2.5MPa steam enters reboiler tube side with 598kg/h by steam port, heats the dimethoxymethane in reboiler after heat exchanging tube heat exchange, and the water that steam condensation generation is 126 DEG C flows out reboiler with 598kg/h; By dimethoxymethane with the 633kg/h vaporization of being heated, being heated to temperature is 121 DEG C, after heat exchange, become dimethoxymethane gas, and rise in vaporizer, dimethoxymethane gas-heated vaporizer tube side, with after ammonia heat exchange in vaporizer tube side, be condensed into heating agent liquid, then flow in reboiler, wherein reboiler communicates with vaporizer;
Enter vaporizer tube side from extraneous liquefied ammonia with 1360kg/h, accept to be vaporized into gaseous ammonia after heat that heating agent gas provides, 105 DEG C of temperature, pressure 2.0MPa, gaseous ammonia is discharged with 1360kg/h flow by vaporizer tube side outlet, directly controls ammonia gas flow and pressure by regulating valve, and with steam regulation valve door formation control loop, indirectly control the heat exchange amount of reboiler, maintain ammonia continous-stable and discharge.
Certainly, thermal medium can also be methyl alcohol, ethanol, dimethyl ether, propylene, butylene, pentane, hexane or HCFC-134a, and fluorine Lyons and the substitute materials thereof such as HCFC-125, can realize the vaporization of liquefied ammonia.
Claims (2)
1. a gasification method for liquefied ammonia, the equipment of employing comprises the reboiler and the vaporizer that are connected, it is characterized in that, according to the following steps operation:
1) heating steam is entered to reboiler tube side by steam port, heat the heating agent in reboiler after heat exchanging tube heat exchange, the water that steam-condensation generates flows out reboiler, and wherein heating agent is dimethoxymethane;
2) the heating agent vaporization of being heated becomes heating agent gas, and rises in vaporizer after heat exchange, and heating agent gas-heated vaporizer tube side and is condensed into heating agent liquid after ammonia heat exchange in vaporizer tube side, then flows in reboiler;
3) enter vaporizer tube side from extraneous liquefied ammonia, accept to be vaporized into gaseous ammonia after heat that heating agent gas provides, gaseous ammonia is discharged by the outlet of vaporizer tube side, directly control ammonia gas flow and pressure by regulating valve, and with steam regulation valve door formation control loop, indirectly control the heat exchange amount of reboiler, maintain ammonia continous-stable and discharge.
2. the method for claim 1, is characterized in that, described vaporizer is one or more.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210476489.0A CN102980023B (en) | 2012-11-21 | 2012-11-21 | Liquid ammonia vaporization method |
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| CN201210476489.0A CN102980023B (en) | 2012-11-21 | 2012-11-21 | Liquid ammonia vaporization method |
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| CN102980023A CN102980023A (en) | 2013-03-20 |
| CN102980023B true CN102980023B (en) | 2014-10-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953070A (en) * | 2016-06-28 | 2016-09-21 | 中国华电科工集团有限公司 | Low-temperature continuous ammonia supply device |
| CN110878907A (en) * | 2018-09-06 | 2020-03-13 | 青岛海湾化学有限公司 | Ethylene vaporization system and control method thereof |
| CN109298726B (en) * | 2018-09-29 | 2022-01-28 | 青海盐湖工业股份有限公司 | Method and system for heating EDC cracking furnace |
| CN109000151B (en) * | 2018-09-30 | 2024-05-03 | 洛阳天泽气体有限公司 | Liquid ammonia circulating water vaporizer device with energy-saving and shock-absorbing functions |
| CN109163218A (en) * | 2018-10-22 | 2019-01-08 | 洛阳天泽气体有限公司 | A kind of device for collecting ammonia gas for hydrogen gas production |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202087068U (en) * | 2011-03-15 | 2011-12-28 | 合肥宁垣工程技术有限责任公司 | Energy-saving liquid ammonia evaporating device |
| CN102353289A (en) * | 2011-10-14 | 2012-02-15 | 中国空分设备有限公司 | Intermediate heat medium re-boiling type vaporizer |
| CN102518935A (en) * | 2011-10-28 | 2012-06-27 | 辽河石油勘探局 | System and method for evaporating liquefied natural gas by utilizing intermediate medium |
| CN102720947A (en) * | 2012-06-28 | 2012-10-10 | 艾淑艳 | Liquid ammonia gasifying system and gasifying process thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6647930B2 (en) * | 2002-02-11 | 2003-11-18 | L'Air Liquide-Societe Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude | Ammonia vapor generation |
| JP5461786B2 (en) * | 2008-04-01 | 2014-04-02 | 株式会社フジキン | Gas supply device with vaporizer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202087068U (en) * | 2011-03-15 | 2011-12-28 | 合肥宁垣工程技术有限责任公司 | Energy-saving liquid ammonia evaporating device |
| CN102353289A (en) * | 2011-10-14 | 2012-02-15 | 中国空分设备有限公司 | Intermediate heat medium re-boiling type vaporizer |
| CN102518935A (en) * | 2011-10-28 | 2012-06-27 | 辽河石油勘探局 | System and method for evaporating liquefied natural gas by utilizing intermediate medium |
| CN102720947A (en) * | 2012-06-28 | 2012-10-10 | 艾淑艳 | Liquid ammonia gasifying system and gasifying process thereof |
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