CN212523051U - Seven-effect tube plate combined falling film evaporation system for concentrating sodium aluminate solution - Google Patents
Seven-effect tube plate combined falling film evaporation system for concentrating sodium aluminate solution Download PDFInfo
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- CN212523051U CN212523051U CN202020848958.7U CN202020848958U CN212523051U CN 212523051 U CN212523051 U CN 212523051U CN 202020848958 U CN202020848958 U CN 202020848958U CN 212523051 U CN212523051 U CN 212523051U
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Abstract
The utility model discloses a concentrated sodium aluminate solution combines falling liquid film evaporation system with seven effect tube sheets, including high temperature evaporator, low temperature evaporator and the supporting flash vessel that sets up in order to and the concentrated return circuit of solution and the steam condensation return circuit that constitutes through tube coupling high temperature evaporator, low temperature evaporator and flash vessel, the concentrated return circuit of solution is including the first concentrated branch road and the concentrated branch road of second that set up side by side, the branch road is retrieved including the raw steam condensation to the steam condensation return circuit. The utility model utilizes the secondary steam for six times through seven-effect operation, so that the steam consumption is lower when the solution is concentrated; the material entering the I-effect heating chamber is reduced by a two-section concentration evaporation technology, so that the consumption of raw steam is reduced; the mode of combining the tubular falling film evaporator in the high-temperature area and the plate falling film evaporator in the low-temperature area is adopted, so that the vapor-liquid separation effect is improved, the scaling phenomenon is reduced, primary condensed water can be recovered by 100%, and the energy-saving and high-efficiency effects are realized.
Description
Technical Field
The utility model belongs to the technical field of falling liquid film evaporation equipment technique and specifically relates to a concentrated sodium aluminate solution is with seven effect tube sheets combine falling liquid film evaporation system.
Background
In the production of alumina, a six-effect evaporator set is usually adopted for concentration and evaporation of sodium aluminate mother liquor, and the steam consumption is about 0.3-0.35 t steam/t water during the operation of the six-effect evaporator set, so that the production cost is high; in order to further reduce the steam consumption and improve the utilization rate of secondary steam, a seven-effect evaporator set is used for concentrating and evaporating sodium aluminate mother liquor at present, however, the steam scaling phenomenon becomes serious along with the increase of the evaporation stage number, and the phenomena of insufficient steam-liquid separation, entrainment of liquid foam, serious alkali leakage and the like exist. In addition, for primary water, the primary water cannot be recovered into a boiler by 100% by adopting the conventional flash evaporation cooling process, so that resource waste is caused.
Disclosure of Invention
In order to solve the problem, the utility model provides a concentrated sodium aluminate solution that steam consumption is low, gas-liquid separation is abundant, the scale deposit is easily cleared up combines falling liquid film evaporation system with seven effect tube sheets, specifically can take following technical scheme:
the utility model discloses a concentrated sodium aluminate solution is with seven effect tube sheet combination falling film evaporation systems, including high temperature evaporator, low temperature evaporator and supporting flash vessel that set up in order, and through the solution concentration return circuit and the steam condensation return circuit that pipeline connection said high temperature evaporator, low temperature evaporator and flash vessel constitute,
the high-temperature evaporator is a plurality of tubular falling-film evaporators consisting of heating chambers and corresponding gas-liquid separation chambers, and comprises a first-effect evaporator, a second-effect evaporator and a third-effect evaporator;
the low-temperature evaporator is a plate-type falling-film evaporator with a planar structure and comprises an IV-effect evaporator, a V-effect evaporator, a VI-effect evaporator and a VII-effect evaporator;
the flash evaporator comprises a grade I flash evaporator, a grade II flash evaporator, a grade III flash evaporator, a grade IV flash evaporator and a grade V flash evaporator;
the solution concentration loop comprises a first concentration branch and a second concentration branch which are arranged in parallel, the first concentration branch is composed of an IV-effect evaporator, a III-effect evaporator, a II-effect evaporator, a I-stage flash evaporator, a II-stage flash evaporator, a III-stage flash evaporator, an IV-stage flash evaporator and a V-stage flash evaporator which are sequentially connected in series, a stock solution feeding pipeline is communicated with a feeding hole of the IV-effect evaporator, and a finished product recovery pipeline is communicated with a discharging hole of the V-stage flash evaporator; the second concentration branch is composed of a V-effect evaporator, a VI-effect evaporator and a VII-effect evaporator which are sequentially connected in series, the stock solution feeding pipeline is communicated with a feeding hole of the V-effect evaporator, a finished product recovery branch pipe communicated with a discharging hole of the VII-effect evaporator is arranged on the finished product recovery pipeline, and a heater is arranged on the finished product recovery branch pipe; circulating feeding pipelines are arranged between a lower discharging port and a top feeding port of the I-VII effect evaporators, and circulating pumps are arranged on the circulating feeding pipelines;
the steam condensation loop comprises a raw steam condensation recovery branch and a secondary steam condensation recovery branch, the raw steam condensation recovery branch comprises an external raw steam inlet pipe communicated with a steam inlet of a heating chamber of the first-effect evaporator and a primary condensate collecting pipe communicated with a condensate outlet of the heating chamber of the first-effect evaporator, and the primary condensate collecting pipe is sequentially provided with a primary condensate collecting tank, a heat exchanger and a primary condensate pump; the secondary steam condensation recovery branch comprises a secondary steam communicating pipe, a secondary steam flash pipe, a noncondensor air outlet pipe and a secondary condensate collecting pipe, wherein the secondary steam communicating pipe is used for sequentially connecting the I-VII evaporators, the secondary steam flash pipe is used for correspondingly connecting the I-V grade flash evaporator and the III-VII effect evaporator, the noncondensor air outlet pipe is led out from the VII effect evaporator and is provided with a water cooler and a vacuum pump, and the secondary condensate collecting pipe is led out from the I-VII evaporators and is provided with a secondary condensate collecting tank and a secondary condensate pump.
And the shell pass and the tube pass of the heat exchanger are respectively and correspondingly communicated with the primary condensate collecting pipe and the secondary condensate collecting pipe.
And a water return pipe entering the water cooling tower is arranged on the water cooler.
The utility model provides a concentrated sodium aluminate solution combines falling film evaporation system with seven effect tube sheet, at first, make the secondary steam utilize six times through seven effect operation, make the steam consumption lower when the solution is concentrated; secondly, the material entering the I-effect heating chamber is reduced by a two-section concentration evaporation technology, so that the consumption of raw steam is reduced; thirdly, a mode of combining a tubular falling film evaporator in a high-temperature area and a plate falling film evaporator in a low-temperature area is adopted, the tubular falling film evaporator adopts a heating chamber and a vapor-liquid separation chamber which are of a split structure to carry out falling film evaporation, so that vapor-liquid separation is sufficient, liquid foam entrainment and alkali leakage are eliminated, secondary condensate water is cleaner, the secondary condensate water is not easy to scale, the secondary condensate water is easy to clean during scaling, and the heat transfer efficiency is higher; and finally, the primary condensate water is cooled by a heat exchanger to ensure 100 percent recovery of the primary condensate water, and the water cooler directly enters a water cooling tower by setting high-level return water to achieve the purpose of saving electricity.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a block diagram of the material flow in fig. 1.
Fig. 3 is a block diagram of the steam flow in fig. 1.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the embodiments of the present invention are based on the technical solutions of the present invention and are described in detail, but the present invention is not limited to the following embodiments.
As shown in fig. 1-3, concentrated sodium aluminate solution with seven effect tube sheet combine falling liquid film evaporation system, including high temperature evaporator, low temperature evaporator and supporting flash vessel that set up in order to and through the tube coupling the concentrated return circuit of solution and the steam condensation return circuit that high temperature evaporator, low temperature evaporator and flash vessel constitute.
Specifically, the high-temperature evaporator adopts a split-type structure of tubular falling-film evaporators, each tubular falling-film evaporator consists of a heating chamber and a corresponding gas-liquid separation chamber, and comprises an I-effect evaporator (consisting of an I-effect heating chamber 1a and an I-effect gas-liquid separation chamber 2 a), a II-effect evaporator (consisting of an II-effect heating chamber 1b and an II-effect gas-liquid separation chamber 2 b), and a III-effect evaporator (consisting of an III-effect heating chamber 1c and an III-effect gas-liquid separation chamber 2 c); the low-temperature evaporator is a plate-type falling-film evaporator with a plane structure, a heating chamber of the low-temperature evaporator is arranged together with a corresponding gas-liquid separation chamber, and the low-temperature evaporator comprises an IV-effect evaporator (consisting of an IV-effect heating chamber 1d and an IV-effect gas-liquid separation chamber 2 d), a V-effect evaporator (consisting of a V-effect heating chamber 1e and a V-effect gas-liquid separation chamber 2 e), a VI-effect evaporator (consisting of a VI-effect heating chamber 1f and a VI-effect gas-liquid separation chamber 2 f), and a VII-effect evaporator (consisting of a VII-effect heating chamber 1g and a VII-effect gas-liquid separation chamber 2 g; the flash evaporator comprises a grade I flash evaporator 3a, a grade II flash evaporator 3b, a grade III flash evaporator 3c, a grade IV flash evaporator 3d and a grade V flash evaporator 3 e.
The solution concentration loop comprises a first concentration branch and a second concentration branch which are arranged in parallel, wherein the first concentration branch is composed of an IV-effect evaporator, a III-effect evaporator, a II-effect evaporator, a I-stage flash evaporator, a II-stage flash evaporator, a III-stage flash evaporator, an IV-stage flash evaporator and a V-stage flash evaporator which are sequentially connected in series, a stock solution feeding pipeline 4 is communicated with a feeding hole of the IV-effect evaporator, and a finished product recovery pipeline 5 is communicated with a discharging hole of the V-stage flash evaporator; the second concentration branch path is composed of a V-effect evaporator, a VI-effect evaporator and a VII-effect evaporator which are sequentially connected in series, a stock solution feeding pipeline 4 is communicated with a feeding hole of the V-effect evaporator, a finished product recovery branch pipe 6 communicated with a discharging hole of the VII-effect evaporator is arranged on a finished product recovery pipeline 5, and a heater 7 is arranged on the finished product recovery branch pipe 6; circulation feeding pipelines 8 are arranged between a lower discharging port and a top feeding port of the I-VII efficient heating chambers, each circulation feeding pipeline 8 is provided with a circulating pump 9, and material conveying pipelines between adjacent heating chambers in the first concentration branch and the second concentration branch are provided with material passing pumps 10.
The steam condensation loop comprises a raw steam condensation recovery branch and a secondary steam condensation recovery branch, wherein the raw steam condensation recovery branch comprises an external raw steam inlet pipe 11 communicated with a steam inlet of the I-effect heating chamber 1a and a primary condensed water collecting pipe 12 communicated with a condensed water outlet of the I-effect heating chamber 1a, and the primary condensed water collecting pipe 12 is sequentially provided with a primary condensed water collecting tank 13, a heat exchanger 14 and a primary condensed water pump 15; the secondary steam condensation recovery branch comprises a secondary steam communicating pipe (namely, a communicating pipe between a secondary steam outlet of the I-VII effect heating chamber and a corresponding gas-liquid separation chamber, a communicating pipe between a secondary steam outlet pipeline of the I-VII effect gas-liquid separation chamber and an air inlet of the next adjacent effect heating chamber) which are sequentially connected with the I-VII evaporator, a secondary steam flash evaporation pipe 17 which correspondingly connects the I-V level flash evaporator and the III-VII effect heating chamber, a noncondensor air outlet pipe which is led out from the VII effect gas-liquid separation chamber 2g and is provided with a water cooler 18 and a vacuum pump 19, and a secondary condensate collecting pipe 22 which is led out from the I-VII heating chamber and is provided with a secondary condensate collecting tank 20 and a secondary condensate pump 21. The shell side and the tube side of the heat exchanger 14 are respectively and correspondingly communicated with the primary condensate collecting pipe 12 and the secondary condensate collecting pipe 22, so that the primary condensate is cooled to obtain 100 percent recovery. The water cooler 18 and the water seal tank are provided with the water return pipe at a high position and directly enter the water cooling tower, so that the investment of a water feeding pump of the water cooling tower can be saved.
During operation, a sodium aluminate solution enters an IV-effect gas-liquid separation chamber 2d and a V-effect gas-liquid separation chamber 2e through a stock solution feeding pipeline 4 according to the flow of two concentration branches, specifically, a stock solution entering the V-effect gas-liquid separation chamber 2e sequentially enters a VI-effect gas-liquid separation chamber 2f and a VII-effect gas-liquid separation chamber 2g and is heated and evaporated through a V-effect heating chamber 1e, a VI-effect heating chamber 1f and a VII-effect heating chamber 1g to obtain a finished product solution, and the finished product solution enters a heater 7 for temperature increase and then is discharged, so that the temperature of a mother solution can be increased to facilitate smooth operation of a lower process; the stock solution entering the IV-effect gas-liquid separation chamber 2d sequentially passes through the III-effect heating chamber 1c, the III-effect gas-liquid separation chamber 2c, the II-effect heating chamber 1b, the II-effect gas-liquid separation chamber 2b, the I-effect heating chamber 1a and the I-effect gas-liquid separation chamber 2a for heating and evaporation, then sequentially enters the I-stage flash evaporator 3a, the II-stage flash evaporator 3b, the III-stage flash evaporator 3c, the IV-stage flash evaporator 3d and the V-stage flash evaporator 3e for cooling and self-evaporation and concentration to obtain a finished product solution, and finally, finished products obtained by the first concentration branch and the second concentration branch are combined and collected by a discharge pump.
Meanwhile, high-temperature steam introduced by a high-temperature air source firstly enters the I-effect heating chamber 1a to heat and concentrate the solution in the I-effect heating chamber 1a, and primary condensate water enters the primary condensate water collecting pipe 12 from a condensate water outlet at the bottom of the I-effect heating chamber 1a and is completely recovered after collection, heat exchange and temperature reduction; the rest of the secondary steam evaporated from the I-effect heating chamber 1a enters the II-effect heating chamber 1b through the I-effect steam-liquid separation chamber 2a, enters the III-effect heating chamber 1c through the II-effect gas-liquid separation chamber 2b, and so on, the secondary steam evaporated from the VII-effect heating chamber 1g enters the water cooler 18 through the VII-effect steam-liquid separation chamber 2g for cooling; in addition, secondary steam from the first-stage flash evaporator 3a enters a III-effect heating chamber 1c, secondary steam from the second-stage flash evaporator 3b enters an IV-effect heating chamber 1d, secondary steam from the III-stage flash evaporator 3c enters a V-effect heating chamber 1e, secondary steam from the IV-stage flash evaporator 3d enters a VI-effect heating chamber 1f, and secondary steam from the V-stage flash evaporator 3e enters a VII-effect heating chamber 1 g.
Claims (3)
1. The utility model provides a concentrated sodium aluminate solution combines falling liquid film evaporation system with seven effect tube sheets, includes high temperature evaporator, low temperature evaporator and supporting flash vessel that set up in order to and through the tube coupling the concentrated return circuit of solution and the steam condensation return circuit that high temperature evaporator, low temperature evaporator and flash vessel constitute, its characterized in that:
the high-temperature evaporator is a plurality of tubular falling-film evaporators consisting of heating chambers and corresponding gas-liquid separation chambers, and comprises a first-effect evaporator, a second-effect evaporator and a third-effect evaporator;
the low-temperature evaporator is a plate-type falling-film evaporator with a planar structure and comprises an IV-effect evaporator, a V-effect evaporator, a VI-effect evaporator and a VII-effect evaporator;
the flash evaporator comprises a grade I flash evaporator, a grade II flash evaporator, a grade III flash evaporator, a grade IV flash evaporator and a grade V flash evaporator;
the solution concentration loop comprises a first concentration branch and a second concentration branch which are arranged in parallel, the first concentration branch is composed of an IV-effect evaporator, a III-effect evaporator, a II-effect evaporator, a I-stage flash evaporator, a II-stage flash evaporator, a III-stage flash evaporator, an IV-stage flash evaporator and a V-stage flash evaporator which are sequentially connected in series, a stock solution feeding pipeline is communicated with a feeding hole of the IV-effect evaporator, and a finished product recovery pipeline is communicated with a discharging hole of the V-stage flash evaporator; the second concentration branch is composed of a V-effect evaporator, a VI-effect evaporator and a VII-effect evaporator which are sequentially connected in series, the stock solution feeding pipeline is communicated with a feeding hole of the V-effect evaporator, a finished product recovery branch pipe communicated with a discharging hole of the VII-effect evaporator is arranged on the finished product recovery pipeline, and a heater is arranged on the finished product recovery branch pipe; circulating feeding pipelines are arranged between a lower discharging port and a top feeding port of the I-VII effect evaporators, and circulating pumps are arranged on the circulating feeding pipelines;
the steam condensation loop comprises a raw steam condensation recovery branch and a secondary steam condensation recovery branch, the raw steam condensation recovery branch comprises an external raw steam inlet pipe communicated with a steam inlet of a heating chamber of the first-effect evaporator and a primary condensate collecting pipe communicated with a condensate outlet of the heating chamber of the first-effect evaporator, and the primary condensate collecting pipe is sequentially provided with a primary condensate collecting tank, a heat exchanger and a primary condensate pump; the secondary steam condensation recovery branch comprises a secondary steam communicating pipe, a secondary steam flash pipe, a noncondensor air outlet pipe and a secondary condensate collecting pipe, wherein the secondary steam communicating pipe is used for sequentially connecting the I-VII evaporators, the secondary steam flash pipe is used for correspondingly connecting the I-V grade flash evaporator and the III-VII effect evaporator, the noncondensor air outlet pipe is led out from the VII effect evaporator and is provided with a water cooler and a vacuum pump, and the secondary condensate collecting pipe is led out from the I-VII evaporators and is provided with a secondary condensate collecting tank and a secondary condensate pump.
2. The system for concentrating sodium aluminate solution with seven-effect tube sheet combined falling film evaporation according to claim 1, characterized in that: and the shell pass and the tube pass of the heat exchanger are respectively and correspondingly communicated with the primary condensate collecting pipe and the secondary condensate collecting pipe.
3. The system for concentrating sodium aluminate solution with seven-effect tube sheet combined falling film evaporation according to claim 1, characterized in that: and a water return pipe entering the water cooling tower is arranged on the water cooler.
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| CN202020848958.7U CN212523051U (en) | 2020-05-20 | 2020-05-20 | Seven-effect tube plate combined falling film evaporation system for concentrating sodium aluminate solution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113769424A (en) * | 2021-09-29 | 2021-12-10 | 重庆博张智能装备有限公司 | Four-effect counter-current falling film evaporation process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113769424A (en) * | 2021-09-29 | 2021-12-10 | 重庆博张智能装备有限公司 | Four-effect counter-current falling film evaporation process |
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