CN213667997U - Last effect exhaust steam surface evaporation condensing system of multi-effect evaporator of sodium aluminate solution - Google Patents
Last effect exhaust steam surface evaporation condensing system of multi-effect evaporator of sodium aluminate solution Download PDFInfo
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- CN213667997U CN213667997U CN202022294576.7U CN202022294576U CN213667997U CN 213667997 U CN213667997 U CN 213667997U CN 202022294576 U CN202022294576 U CN 202022294576U CN 213667997 U CN213667997 U CN 213667997U
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Abstract
The utility model relates to an aluminium oxide production technical field, in particular to last effect exhaust steam surface evaporation condensing system of multi-effect evaporator of sodium aluminate solution. The system relates to a surface evaporation air cooler, the gas outlet of an exhaust steam pipeline of an end-effect evaporator of a multi-effect evaporator group of an alumina production line is connected to the gas inlet of the surface evaporation air cooler, the gas outlet of the surface evaporation air cooler is connected to the gas inlet of a vacuum pump, the condensate water outlet of the surface evaporation air cooler is connected to the water inlet of a condensate water tank, the water outlet of the surface evaporation air cooler is connected to the water inlet of the surface evaporation air cooler through a spray water pump, a water collector is arranged between a spray pipe and a heat exchanger in the surface evaporation air cooler, and heat exchange filler. The utility model discloses spray water sprays to the water collector in the surface evaporation air cooler, can make and assemble the vapour rapid cooling who receives on the water collector and flow back to the water tank, improves spray water cyclic utilization efficiency, and the filler setting can reduce owing to spray the fog that produces, reduces the water consumption in the water tank.
Description
Technical Field
The utility model relates to an aluminium oxide production technical field, in particular to last effect exhaust steam surface evaporation condensing system of multi-effect evaporator of sodium aluminate solution.
Background
The concentration of mother liquor recycled in the alumina production by the Bayer process needs to be improved through a multi-effect evaporator group, the main task of the evaporation process is to remove redundant water in the process, improve the concentration of caustic alkali in the mother liquor, keep the liquid volume balance of the alumina production system, the evaporation operation is indirect heating, the qualified condensed water of new steam can be used as boiler water, the secondary condensed water can be used as washing water and circulating water for supplementing water, the evaporation station also plays a role of a water softening station, the evaporation steam consumption accounts for 30-45% of the total steam consumption of the Bayer process in the process, in the digestion preheating system for the alumina production, a large amount of dead steam can be generated in the ore pulp digestion process, and the dead steam enters a water cooler for recycling.
Fig. 1 shows a conventional multi-effect evaporator system, fig. 1 shows a part of a block diagram and fig. 2 shows a final-effect exhaust steam condensing system 18, low-temperature water is generally used for cooling and condensing through a direct water cooler, the cooling mode of the direct water cooler is that exhaust steam in a final-effect evaporator 8 enters a water cooling tower 12, circulating water is introduced into the water cooling tower 12 to cool the exhaust steam, the circulating water directly contacts with the exhaust steam to condense the exhaust steam, the heat of the exhaust steam is absorbed by water to form hot water, the hot water is conveyed to a hot water tank 13, the hot water is pumped into a cooling tower 17 through a hot water pump 14 to be cooled, and the cooled circulating water enters a cold water tank 15 and is pumped into the water cooling tower 12 through a cold water pump 16 to be recycled. By adopting the method to condense the dead steam, on one hand, condensed water and cooling water are mixed together, and the cooling water is polluted; on the other hand, the waste steam which is not recovered can be discharged into the atmosphere, and because the waste steam contains alkali, the waste steam discharged into the atmosphere can cause environmental pollution, and simultaneously waste of waste steam waste heat can be caused, so that the production cost of the alumina is increased.
Chinese patent application No. CN201821142093.1 discloses an indirect heat exchange evaporative condensing system for concentrating end-effect steam of an evaporator system, which comprises a shell with an induced draft opening on the top wall, and an induced draft fan arranged at the induced draft opening; the spraying pipes, the heat exchanger and the water collecting chamber are arranged in the shell at intervals from top to bottom; the steam inlet of the heat exchanger is communicated with the outlet of the last-effect flashing pipeline, the gas outlet of the heat exchanger is communicated with the gas inlet of the vacuum pump, the condensed water outlet of the heat exchanger is communicated with the water inlet of the condensed water tank, and the water outlet of the condensed water tank is communicated with the water inlet of the condensed water pump; the water outlet of the water collecting chamber at the bottom of the shell is communicated with the water inlet of the spray pipe through a circulating water pump. The inside hydrophone of receiving that is provided with of this system's casing can avoid shower spun water droplet to be taken out the casing by humid air, and it collects the water droplet and flows back to the catchment of bottom after collecing indoor, but it receives the hydrophone and is located the shower top, just can lean on self gravity and surface tension to flow back to catchment indoor after the water droplet needs a period of gathering, and the cyclic utilization efficiency of cooling water is not high.
In addition, some of the existing cooling water is cooled by filling materials, and the filling materials are usually arranged above the water tank, so that a part of space in the shell is occupied, the volume of the shell is increased, meanwhile, spraying water is easy to spray on the filling materials, fog is easy to generate, and the generated fog is easily brought out of the shell by wet air, so that the water consumption is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the not high and spray water splash of present evaporation condensing system cooling water cyclic utilization efficiency and very easily producing the fog on packing, be taken out the casing by humid air easily, cause the technical problem that the water consumption increases, a multi-effect evaporimeter end effect exhaust steam surface evaporation condensing system of sodium aluminate solution is provided, set up between shower and the heat exchanger and receive the hydrophone, the shower water absorbs the heat of exhaust steam in the heat exchanger on spraying the heat exchanger through receiving the hydrophone, the high temperature steam who produces rises to collect on the water collector, spray through the spray water and can make high temperature steam rapid cooling, then flow back in the water tank, thereby improve cooling water cyclic utilization efficiency, the packing sets up in spray tank, can reduce the fog and produce, reduce the water consumption, can save space.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is: the utility model provides a last effect exhaust steam surface evaporation condensing system of multi-effect evaporator of sodium aluminate solution, relate to the surface evaporation air cooler, the last effect evaporator exhaust steam pipeline gas outlet of alumina production line multi-effect evaporator group is connected to the air inlet of surface evaporation air cooler, the gas outlet of surface evaporation air cooler is connected to the air inlet of vacuum pump, the comdenstion water delivery port of surface evaporation air cooler is connected to the water inlet of condensation water pitcher, the delivery port of condensation water pitcher is connected to the water inlet of condensate pump, the delivery port of condensate pump is connected to the moisturizing mouth and the hot water system pipe network of surface evaporation air cooler respectively, the outlet of surface evaporation air cooler is connected to the water inlet of surface evaporation air cooler through spray pump, set up between the inside shower of surface evaporation air cooler and the heat exchanger and receive.
Further, the surface evaporation air cooler comprises a shell, an air port is formed in the top wall of the shell, a fan is arranged at the air port, a spray pipe, a water collector, a heat exchanger and a water tank are arranged in the shell at intervals from top to bottom, an air outlet of an exhaust steam pipeline of an end-effect evaporator of the alumina production line multi-effect evaporator group is connected to an air inlet of the heat exchanger, an air outlet of the heat exchanger is connected to an air inlet of a vacuum pump, a condensate water outlet of the heat exchanger is connected to a water inlet of a condensate water tank, a water outlet of the condensate water tank is connected to a water inlet of a condensate water pump, a water outlet of the condensate water pump is connected.
Further, the water collector is a multi-wave water collector.
Further, the heat exchanger is of a shell and tube or plate structure.
Furthermore, a water level control device is arranged in the water tank.
The utility model discloses following beneficial effect has:
(1) the utility model discloses set up the multi-wave type in the surface evaporation condensing system's the surface evaporation air cooler between spray pipe and the heat exchanger and receive the hydrophone, the shower water sprays the heat that absorbs the exhaust steam in the heat exchanger on the heat exchanger through receiving the hydrophone, emits the heat during exhaust steam condensation and makes the outer shower water evaporation of heat exchanger, and the high temperature steam that produces rises to collect on receiving the hydrophone, and the shower water sprays on receiving the hydrophone, can make high temperature steam rapid cooling reflux in the water tank to improve cooling water cyclic utilization efficiency.
(2) The utility model discloses set up the filler in surface evaporation condensing system's surface evaporation air cooler water tank, can reduce because the spray water splash to the fog that produces on the filler to reduce water consumption, can save casing inner space simultaneously, increase the loading, make the cooling effect better, and have the convenient characteristics of maintenance.
(3) The utility model discloses the comdenstion water quality that surface evaporation condensing system retrieved is high (organic matter, alkali content, conductivity etc. relevant parameter are lower) to the temperature is higher, and for 50~53 ℃, the comdenstion water of high temperature is sent to sedimentation hot-water tank, aluminium hydroxide flat disc and is filtered washing water and plant area heating and use, or sends to power boiler after water treatment and uses.
(4) The utility model discloses surface evaporation condensing system's condensation, mechanical draft and spraying equipment integration, equipment is small, and area is little, and equipment spray pump, fan low power dissipation can practice thrift the working costs.
Drawings
Fig. 1 is a flow diagram of a conventional multiple effect evaporator system.
Fig. 2 is a partially enlarged view of fig. 1.
Fig. 3 is a structural diagram of the present invention.
In the figure: 1. the system comprises a fan, 2 a spray pipe, 3 a multi-wave water collector, 4 a heat exchanger, 5 a water tank, 6 a spray water pump, 7 a filler, 8 an end-effect evaporator, 9 a vacuum pump, 10 a condensation water tank, 11 a condensation water pump, 12 a water cooling tower, 13 a hot water tank, 14 a hot water pump, 15 a cold water tank, 16 a cold water pump, 17 a cooling tower and 18 an end-effect exhaust steam condensation system.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples, but the present invention is not limited to the specific examples.
As shown in fig. 3, the final effect exhaust steam surface evaporation and condensation system of a multi-effect evaporator for sodium aluminate solution relates to a surface evaporation air cooler, the surface evaporation air cooler comprises a shell, the top wall of the shell is provided with an air port, the air port is provided with a fan 1, the fan 1 adopts frequency conversion control and can be adjusted along with the change of the ambient temperature and the exhaust steam quantity, the fan 1 can enable air to continuously enter the shell, thereby reducing the evaporation temperature and further reducing the water consumption, a spray pipe 2, a multi-wave type water collector 3, a heat exchanger 4 and a water tank 5 are arranged in the shell from top to bottom at intervals, the heat exchanger 4 is of a tube type or plate type structure, the air outlet of the exhaust steam pipeline of the final effect evaporator of the multi-effect evaporator group of an alumina production line is connected to the air inlet of the heat exchanger 4 in the surface evaporation air cooler, the air outlet of the heat, the temperature of condensed water after exhaust steam condensation is 50-53 ℃, the water outlet of a condensed water tank 10 is connected to the water inlet of a condensed water pump 11, the water outlet of the condensed water pump 11 is respectively connected to a water replenishing port of a water tank 5 in a surface evaporation air cooler and an external hot water system pipe network, concretely, the condensed water is sent to a sedimentation hot water tank, an aluminum hydroxide flat disc for filtering washing water and plant heating, or is sent to a power plant boiler for use after water treatment, the water outlet of the water tank 5 is connected to the water inlet of a spray pipe 2 through a spray water pump 6, heat exchange filler 7 is arranged in the water tank 5, the filler 7 is arranged in the water tank 5, mist generated by spraying the spray water on the filler 7 can be reduced, so that the water consumption is reduced, meanwhile, the internal space of a shell can be saved, the filling amount is increased, the cooling effect is better, the maintenance is convenient, water can be replenished when the water level drops.
The utility model discloses a surface evaporation condensing system is a high-efficient condensation cooling device that integrates water-cooling, air cooling and mass transfer heat transfer process into one body, the last effect evaporimeter exhaust steam of aluminium oxide production line multiple-effect evaporator group enters the heat exchanger in the surface evaporation air cooler, the setting of multiwave type water collector is between shower and heat exchanger, shower water sprays the heat of exhaust steam in the heat exchanger on absorbing the heat through water collector, the heat of giving off when the exhaust steam condenses makes the shower water outside the heat exchanger evaporate, the high temperature steam that produces rises and collects on the water collector, the shower water sprays on the water collector, make high temperature steam cool down fast and flow back to the water tank in, thereby improve cooling water cyclic utilization efficiency, help reducing the temperature of comdenstion water simultaneously, in addition have a small amount of steam to take away the atmosphere under the effect of fan, the heat that cold air rose makes the shower water that does not evaporate flow into the water tank simultaneously, and the spray water in the water tank is delivered into the spray pipe for spraying through the spray water pump, so that the cyclic use of the spray water is realized.
The utility model discloses surface evaporation condensing system is with condensation, mechanical draft and spraying equipment integration, and equipment is small, and area is little, and equipment spray water pump, fan low power dissipation practice thrift the working costs, and the comdenstion water quality of retrieving is high (organic matter, alkali content, relevant parameters such as conductivity are lower), and the temperature is higher, and for 50~53 ℃, the comdenstion water of high temperature is sent to the subsidence hot-water tank, aluminium hydroxide flat dish filters the washing water and the use of factory heating, or sends to the boiler of power plant after water treatment and uses.
The above description is further detailed in connection with the preferred embodiments of the present invention, and it is not intended that the specific embodiments of the present invention be limited to these descriptions. To the utility model belongs to the technical field of the ordinary technical personnel, do not deviate from the utility model discloses a under the prerequisite of the design, can also make simple deduction and replacement, all should regard as the utility model discloses a protection scope.
Claims (5)
1. The utility model provides a last effect exhaust steam surface evaporation condensing system of multi-effect evaporimeter of sodium aluminate solution, relates to surface evaporation air cooler, its characterized in that: the exhaust steam pipeline gas outlet of the last effect evaporator of the multi-effect evaporator group of the alumina production line is connected to the gas inlet of the surface evaporation air cooler, the gas outlet of the surface evaporation air cooler is connected to the gas inlet of the vacuum pump, the condensed water outlet of the surface evaporation air cooler is connected to the water inlet of the condensed water tank, the water outlet of the condensed water tank is connected to the water inlet of the condensed water pump, the water outlet of the condensed water pump is respectively connected to the water replenishing port and the hot water system pipe network of the surface evaporation air cooler, the water outlet of the surface evaporation air cooler is connected to the water inlet of the surface evaporation air cooler through the spray water pump, a water collector is arranged between the spray.
2. The system for the evaporative condensation of the last effect exhaust steam of a multi-effect evaporator of sodium aluminate solution as claimed in claim 1, wherein: the surface evaporation air cooler comprises a shell, an air port is formed in the top wall of the shell, a fan is arranged at the air port, a spray pipe, a water collector, a heat exchanger and a water tank are arranged in the shell at intervals from top to bottom, an air outlet of an exhaust steam pipeline of a last-effect evaporator of the alumina production line multi-effect evaporator group is connected to an air inlet of the heat exchanger, an air outlet of the heat exchanger is connected to an air inlet of a vacuum pump, a condensate water outlet of the heat exchanger is connected to a water inlet of a condensate water tank, a water outlet of the condensate water tank is connected to a water inlet of a condensate water pump, a water outlet of the condensate water pump.
3. The system for the evaporative condensation of the last effect exhaust steam of a multi-effect evaporator of sodium aluminate solution as claimed in claim 1, wherein: the water collector is a multi-wave water collector.
4. The system for the evaporative condensation of the last effect exhaust steam of a multi-effect evaporator of sodium aluminate solution as claimed in claim 1, wherein: the heat exchanger is in a shell-and-tube or plate structure.
5. The system for the evaporative condensation of the last effect exhaust steam of a multi-effect evaporator of sodium aluminate solution as claimed in claim 1, wherein: a water level control device is arranged in the water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022294576.7U CN213667997U (en) | 2020-10-15 | 2020-10-15 | Last effect exhaust steam surface evaporation condensing system of multi-effect evaporator of sodium aluminate solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022294576.7U CN213667997U (en) | 2020-10-15 | 2020-10-15 | Last effect exhaust steam surface evaporation condensing system of multi-effect evaporator of sodium aluminate solution |
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| Publication Number | Publication Date |
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| CN213667997U true CN213667997U (en) | 2021-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022294576.7U Active CN213667997U (en) | 2020-10-15 | 2020-10-15 | Last effect exhaust steam surface evaporation condensing system of multi-effect evaporator of sodium aluminate solution |
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| CN (1) | CN213667997U (en) |
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