CN101792679B - Energy-saving method for vaporizing feed of propylene depolymerization oil tower by stepped utilization of low-temperature wastewater and device thereof - Google Patents
Energy-saving method for vaporizing feed of propylene depolymerization oil tower by stepped utilization of low-temperature wastewater and device thereof Download PDFInfo
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- CN101792679B CN101792679B CN 201010125083 CN201010125083A CN101792679B CN 101792679 B CN101792679 B CN 101792679B CN 201010125083 CN201010125083 CN 201010125083 CN 201010125083 A CN201010125083 A CN 201010125083A CN 101792679 B CN101792679 B CN 101792679B
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Abstract
An energy-saving method for feeding depropenization polymerization oil tower during vaporizing stepped utilization low-temperature wastewater and a device thereof are realized by following steps: serially connecting first-stage low-temperature wastewater, second-stage low-temperature wastewater and third-stage low-temperature wastewater to supply heat, wherein the first-stage low-temperature wastewater firstly enters a reboiler at the tower bottom to provide heat for the tower bottom, and then the second-stage low-temperature wastewater enters a feeding heat exchanger to provide heat for tower feeding; when the temperature of the oil feeding is over bubbling point after the heat exchange between the feeding heat exchanger and the second-stage low-temperature wastewater, rectifying by entering the depropenization polymerization oil tower from the tower top in the form of gas-liquid two-phase mixture; after rectifying; condensing and cooling the material at the tower top after distillation to obtain liquid phase propylene, and the material at the tower bottom entering a discharging heat exchanger at the tower bottom after passing through a liquid level control valve at the tower bottom; the third-stage low-temperature wastewater then entering the discharging heat exchanger at the tower bottom to provide heat for the material discharged at the tower bottom with low temperature; and then sending the polymerization oil to a flash kettle after the material discharged at the tower bottom and the third-stage low-temperature are at normal temperature. The invention carries out stepped utilization of low-temperature wastewater, thereby changing waste into treasure and effectively obtaining maximal utilization value of low-temperature wastewater, reducing vapor consumption and saving energy.
Description
Technical field
The present invention relates to power-economizing method and device that ladder in a kind of petroleum chemical industry utilizes the low-temperature wastewater feeding depropenization polymerization oil tower during vaporizing.
Background technology
In using the Chemical Manufacture of propylene as raw material, unreacted liquid propylene need to carry out recycling, contains stand oil in the propylene of recovery, and this stand oil main component is carbon six or carbon nine compounds.Before recycling, need to reduce stand oil content, partial material will be carried out rectifying, removes stand oil at the bottom of the tower, and the overhead product propylene recycles.In traditional rectifying theory, rectifying separation is with bubble point or be lower than the bubble point charging for well, and vapour phase charging meeting increases the theoretical plate number of rectifying tower or increases the reflux ratio of rectifying tower.Because the volatility of propylene and stand oil differs larger, so this tower adopted the recovery tower that only has stripping section not have rectifying section, do not reflux, and the overhead product propylene recycles.
Take off in the stand oil tower at propylene at present, conventional heat exchange process is adopted in charging, and heat exchange is carried out in the stand oil discharging at the bottom of elder generation and the tower, then gives the separation column charging.After stand oil discharging and the charging heat exchange, through Liquid level adjusting valve at the bottom of the tower, after the decompression cooling, need to remove flash tank with the low-temperature wastewater heat exchange to normal temperature again at the bottom of the tower.Bottom reboiler heat one route low-temperature wastewater provides, because the low-temperature wastewater flow is limited, another route 1.3MPa steam provides.Low-temperature wastewater one tunnel to tower at the bottom of the discharging heat supply, the one tunnel to the bottom reboiler heat supply, the low-temperature wastewater after the heat supply need to cool off with recirculated water again, then goes out device.
In this technique, because the polymerization oil mass is much smaller than inlet amount at the bottom of the tower, the temperature of stand oil is reduced to 40 ℃ by 65 ℃ at the bottom of the tower, the temperature range of decrease is larger, and that feeding temperature improves is limited, brings up to 30.7 ℃ by 30 ℃, and it is more that charging is lower than bubble point, cross cold material and enter rectifying tower and carry out rectifying separation, the energy consumption of bottom reboiler is large.At the bottom of the tower stand oil with the charging heat exchange after, through Liquid level adjusting valve at the bottom of the tower, because Liquid level adjusting valve front and back pressure reduction is large at the bottom of the tower, materials at bottom of tower decompression rear section vaporization, the cooling extent of discharging is larger at the bottom of the tower, and temperature is lower than 0 ℃, has to low-temperature wastewater it be heated again flash distillation, low-temperature wastewater high temperature hangs down usefulness, has the waste of potential temperature.
Summary of the invention
The technical problem to be solved in the present invention provides power-economizing method and the device that a species stage utilizes the low-temperature wastewater feeding depropenization polymerization oil tower during vaporizing, the low-temperature wastewater ladder is utilized, turn waste into wealth, effectively bring into play the maximum utility value of low-temperature wastewater, reduce steam consumption quantity, save energy.
The ladder that the present invention relates to utilizes the power-economizing method of low-temperature wastewater feeding depropenization polymerization oil tower during vaporizing, and its special character is: adopt one-level, secondary, three grade low-temp waste water series connection heat supply, the one-level low-temperature wastewater is introduced into bottom reboiler, provides thermal source at the bottom of the tower; Then the secondary low-temperature wastewater enters feed exchanger, for the tower charging provides thermal source; The tower charging reaches more than the bubble point through temperature after feed exchanger and the heat exchange of secondary low-temperature wastewater, enters propylene with the gas-fluid two-phase mixture form by cat head and takes off the stand oil tower and carry out rectifying; After the rectifying, the cat head material obtains liquid propylene through condensing cooling, and materials at bottom of tower enters effluent exchanger at the bottom of the tower behind Liquid level adjusting valve at the bottom of the tower; Three grade low-temp waste water enter effluent exchanger at the bottom of the tower again, give the tower of low-temperature level more at the bottom of discharging thermal source is provided, discharging and three grade low-temp wastewater heat exchange are behind normal temperature at the bottom of the tower, stand oil removes flash tank.
The ladder that the present invention relates to utilizes the energy saver of low-temperature wastewater feeding depropenization polymerization oil tower during vaporizing, comprise that propylene takes off the stand oil tower, bottom reboiler, Liquid level adjusting valve and flash tank at the bottom of the tower, described bottom reboiler is located at propylene and takes off the stand oil tower bottom, Liquid level adjusting valve is connected on the materials at bottom of tower outlet that propylene takes off the stand oil tower at the bottom of the tower, its special character is: be connected to feed exchanger at the feeding depropenization polymerization oil tower during mouth, the cat head material outlet that takes off the stand oil tower at propylene is connected to the overhead condensation water cooler, effluent exchanger at the bottom of being provided with tower between Liquid level adjusting valve at the bottom of the tower and the flash tank, at bottom reboiler, be serially connected with successively the low-temperature wastewater pipeline at the bottom of feed exchanger and the tower between the effluent exchanger, wherein low-temperature wastewater pipeline entrance and exit lays respectively at effluent exchanger one side at the bottom of bottom reboiler one side and the tower.
The present invention changes low-temperature wastewater into the series connection heat supply by heat supply in parallel, and low-temperature wastewater is called one, two, three low-temperature wastewater along with the reduction of potential temperature is divided into three phases in the device, the ladder utilization.One-level waste water is introduced into bottom reboiler, provide thermal source at the bottom of giving tower, then secondary waste water enters feed exchanger, because feed component is lighter than component at the bottom of the tower, bubble point also is lower than component at the bottom of the tower, and secondary waste water can provide thermal source for the tower charging, and three grades of waste water enter effluent exchanger at the bottom of the tower again, discharging provides thermal source at the bottom of giving the tower of low-temperature level more, and the low-temperature wastewater water cooler can be cancelled.Heat successively propylene with low-temperature wastewater and take off discharging at the bottom of reboiler at the bottom of the stand oil Tata, charging, the tower, made the utilization order of low-temperature wastewater in order, form ladder and utilized the energy, effectively bring into play the maximum utility value of Low Temperature Thermal, stand oil content is low in the charging, and the volatility of propylene and stand oil differs larger, the feeding part vaporization, impact on overhead product propylene quality is very little, and stand oil does not obtain enrichment in the propylene of vaporization, need not increase the tower tray number yet.Because feeding part vaporization, thermal load can significantly descend at the bottom of the tower, the bottom reboiler heat is only provided by the one-level low-temperature wastewater just can, thermal load can significantly descend at the bottom of the tower, thereby save high-quality, higher-priced steam source, product cost is declined to a great extent, and operation control is simple, flexible.
Description of drawings
Fig. 1 is system schematic of the present invention.
Among the figure: the 1-feed exchanger, the 2-propylene takes off the stand oil tower, 3-overhead condensation water cooler, Liquid level adjusting valve at the bottom of the 4-tower, effluent exchanger at the bottom of the 5-tower, 6-flash tank, 7-bottom reboiler, 8-low-temperature wastewater pipeline.
Embodiment
As shown in the figure, adopt one-level, secondary, three grade low-temp waste water series connection heat supply, the one-level low-temperature wastewater is introduced into bottom reboiler 7, provides thermal source at the bottom of the tower; Then the secondary low-temperature wastewater enters feed exchanger 1, for the tower charging provides thermal source; Reclaim the liquid propylene raw material and reach more than the bubble point through temperature after feed exchanger 1 and the heat exchange of secondary low-temperature wastewater, enter propylene with the gas-fluid two-phase mixture form by cat head and take off stand oil tower 2 and carry out rectifying; After the rectifying, cat head obtains gas-phase propene, gets stand oil at the bottom of the tower.The top gaseous phase material obtains liquid propylene through overhead condensation water cooler 3 condensing coolings, recycles.Materials at bottom of tower enters effluent exchanger 5 at the bottom of the tower behind Liquid level adjusting valve at the bottom of the tower 4; Three grade low-temp waste water enter effluent exchanger 5 at the bottom of the tower, give the tower of low-temperature level more at the bottom of discharging thermal source is provided, discharging and three grade low-temp wastewater heat exchange are behind normal temperature at the bottom of the tower, stand oil removes flash tank 6.
The ladder that the present invention relates to utilizes the energy saver of low-temperature wastewater feeding depropenization polymerization oil tower during vaporizing, comprise that propylene takes off stand oil tower 2, bottom reboiler 7, Liquid level adjusting valve 4 and flash tank 6 at the bottom of the tower, described bottom reboiler 7 is located at propylene and takes off stand oil tower 2 bottoms, Liquid level adjusting valve 4 is connected on the materials at bottom of tower outlet that propylene takes off stand oil tower 2 at the bottom of the tower, take off stand oil tower 2 opening for feeds at propylene and be connected to feed exchanger 1, the cat head material outlet that takes off stand oil tower 2 at propylene is connected to overhead condensation water cooler 3, effluent exchanger 5 at the bottom of being provided with tower between Liquid level adjusting valve at the bottom of the tower 4 and the flash tank 6, at bottom reboiler 7, be serially connected with successively low-temperature wastewater pipeline 8 at the bottom of feed exchanger 1 and the tower between the effluent exchanger 5, wherein low-temperature wastewater pipeline 8 entrance and exits lay respectively at effluent exchanger 5 one sides at the bottom of bottom reboiler 7 one sides and the tower.
Claims (2)
1. a species stage utilizes the power-economizing method of low-temperature wastewater feeding depropenization polymerization oil tower during vaporizing, it is characterized in that: adopt one-level, secondary, three grade low-temp waste water series connection heat supply, the one-level low-temperature wastewater is introduced into bottom reboiler, provides thermal source at the bottom of the tower; Then the secondary low-temperature wastewater enters feed exchanger, for the tower charging provides thermal source; The tower charging reaches more than the bubble point through temperature after feed exchanger and the heat exchange of secondary low-temperature wastewater, enters propylene with the gas-fluid two-phase mixture form by cat head and takes off the stand oil tower and carry out rectifying; After the rectifying, the cat head material obtains liquid propylene through condensing cooling, and materials at bottom of tower enters effluent exchanger at the bottom of the tower behind Liquid level adjusting valve at the bottom of the tower; Three grade low-temp waste water enter effluent exchanger at the bottom of the tower again, give the tower of low-temperature level more at the bottom of discharging thermal source is provided, discharging and three grade low-temp wastewater heat exchange are behind normal temperature at the bottom of the tower, stand oil removes flash tank.
2. a species stage utilizes the energy saver of low-temperature wastewater feeding depropenization polymerization oil tower during vaporizing, comprise that propylene takes off the stand oil tower, bottom reboiler, Liquid level adjusting valve and flash tank at the bottom of the tower, described bottom reboiler is located at propylene and takes off the stand oil tower bottom, Liquid level adjusting valve is connected on the materials at bottom of tower outlet that propylene takes off the stand oil tower at the bottom of the tower, it is characterized in that: be connected to feed exchanger at the feeding depropenization polymerization oil tower during mouth, the cat head material outlet that takes off the stand oil tower at propylene is connected to the overhead condensation water cooler, effluent exchanger at the bottom of being provided with tower between Liquid level adjusting valve at the bottom of the tower and the flash tank, at bottom reboiler, be serially connected with successively the low-temperature wastewater pipeline at the bottom of feed exchanger and the tower between the effluent exchanger, wherein low-temperature wastewater pipeline entrance and exit lays respectively at effluent exchanger one side at the bottom of bottom reboiler one side and the tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010125083 CN101792679B (en) | 2010-02-11 | 2010-02-11 | Energy-saving method for vaporizing feed of propylene depolymerization oil tower by stepped utilization of low-temperature wastewater and device thereof |
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| CN 201010125083 CN101792679B (en) | 2010-02-11 | 2010-02-11 | Energy-saving method for vaporizing feed of propylene depolymerization oil tower by stepped utilization of low-temperature wastewater and device thereof |
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| CN101792679A CN101792679A (en) | 2010-08-04 |
| CN101792679B true CN101792679B (en) | 2013-04-24 |
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| CN106016794B (en) * | 2016-05-20 | 2019-02-19 | 上海优华系统集成技术股份有限公司 | A system and method for recycling waste heat of aromatic hydrocarbon plant |
| CN113289365B (en) * | 2021-07-01 | 2022-06-17 | 燕山大学 | Absorption heat pump rectification system based on intermediate reboiling and intermediate condensation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020050345A1 (en) * | 2000-10-31 | 2002-05-02 | Haruo Miura | Heat exchanger for air compressor |
| CN101520257A (en) * | 2009-03-31 | 2009-09-02 | 淮安恒信水务科技有限公司 | High-low temperature waste water double-channel heat recovery heat pump system |
| CN201331285Y (en) * | 2008-11-26 | 2009-10-21 | 烟台信德热泵科技有限公司 | Recovery system for waste heat of waste water |
| CN201396990Y (en) * | 2009-03-31 | 2010-02-03 | 淮安恒信水务科技有限公司 | High and low temperature wastewater heat recovery heat pump system with operation adjustment device |
| CN201670808U (en) * | 2010-02-11 | 2010-12-15 | 中石油东北炼化工程有限公司锦州设计院 | Energy-saving device for stepwise utilization of low-temperature wastewater vaporization propylene depolymerization oil tower feed |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020050345A1 (en) * | 2000-10-31 | 2002-05-02 | Haruo Miura | Heat exchanger for air compressor |
| CN201331285Y (en) * | 2008-11-26 | 2009-10-21 | 烟台信德热泵科技有限公司 | Recovery system for waste heat of waste water |
| CN101520257A (en) * | 2009-03-31 | 2009-09-02 | 淮安恒信水务科技有限公司 | High-low temperature waste water double-channel heat recovery heat pump system |
| CN201396990Y (en) * | 2009-03-31 | 2010-02-03 | 淮安恒信水务科技有限公司 | High and low temperature wastewater heat recovery heat pump system with operation adjustment device |
| CN201670808U (en) * | 2010-02-11 | 2010-12-15 | 中石油东北炼化工程有限公司锦州设计院 | Energy-saving device for stepwise utilization of low-temperature wastewater vaporization propylene depolymerization oil tower feed |
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Address after: 121001 No. two, Chongqing Road, Guta District, Liaoning, Jinzhou, seven Patentee after: Jinzhou Design Institute, China Petroleum Group Northeast Refining & Chemical Engineering Co., Ltd. Address before: 121001 No. two, Chongqing Road, Guta District, Liaoning, Jinzhou, seven Patentee before: Jizhou Design Institute of CNPC Northeast Petroleum Refinery Engineering Co., Ltd. |