CN219231438U - One-effect evaporation crystallization device - Google Patents
One-effect evaporation crystallization device Download PDFInfo
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- CN219231438U CN219231438U CN202320217424.8U CN202320217424U CN219231438U CN 219231438 U CN219231438 U CN 219231438U CN 202320217424 U CN202320217424 U CN 202320217424U CN 219231438 U CN219231438 U CN 219231438U
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Abstract
The utility model discloses a one-effect evaporation crystallization device which comprises an evaporation chamber, a spraying device, a heater, a circulating pipe and a condensate water tank; the spraying device comprises a spraying pipe, a spray head and a spraying valve; a guide cylinder is vertically arranged in the evaporation chamber, a bottom cylinder opening of the guide cylinder is communicated with one end of a connecting pipe, and the other end of the connecting pipe passes through the inner wall of the evaporation chamber in a sealing way and is communicated with the top end of the heater; a spray head is fixed in the evaporation chamber above the guide cylinder, one end of the spray pipe passes through the side wall of the evaporation chamber in a sealing way and is communicated with the spray head, and the other end of the spray pipe is communicated with a bottom water outlet of the condensed water tank through a condensed water pump. The advantages are that: the utility model increases the stable running time of the system from 20 days to about 25 days by additionally arranging the spraying device in the evaporating chamber of the one-effect evaporating and crystallizing device. The steam consumption is saved by about 27 tons per month, and the steam cost is saved by about 2241 yuan. The cleaning frequency is reduced by 10 times every year, so that the recovery amount of mother liquor is reduced, and the system operation is more stable.
Description
Technical Field
The utility model relates to the technical field of evaporative crystallization, in particular to a one-effect evaporative crystallization device.
Background
The evaporating crystallizer can make the solution supersaturated by evaporating part of the solvent, and is widely used for evaporating concentration and waste liquid treatment of water or organic solution in the industries of medicine, food, chemical industry, light industry and the like.
As the evaporation system operates, the temperature of the feed liquid in the one-effect crystallizer is increased, the bubble aggregation phenomenon occurs at the top of the evaporation chamber due to the boiling of the feed liquid, and as the baffle plate is arranged at the top of the evaporation chamber, the bubbles rise and accumulate below the baffle plate under the influence of negative pressure of the system, and as the operation time passes, the bubble adhesion quantity is increased, and a layer of softer salt scale is formed at the top of the evaporation chamber. Because the temperature of the feed liquid in the one-effect crystallizer is not lower than 96 ℃, the feed liquid is always in a boiling state, the liquid level of the feed liquid can form liquid level fluctuation along with boiling, and the formed salt scale is in a hyperbolic shape. The formation of salt scale causes the top space clearance of the evaporating chamber to be smaller, reduces the space for separating feed liquid from secondary vapor and liquid in the evaporating chamber, and leads to shorter operation period of evaporating crystallization and lower operation stability of the system. The common mode for maintaining the stable operation of the system at present is to increase the frequency of brushing the clean water in the crystallizer, replace the mother solution and salt in the tank with clean water completely, and heat the brush tank with clean water. Leading to frequent brushing of the cans and thus a great increase in the amount of mother liquor produced by the cleaning.
Meanwhile, under the influence of boiling of the feed liquid and fluctuation of the liquid level, part of the liquid level and bubbles carried on the surface of the liquid level can rise to the position above the salt scale center hole, and the liquid level and bubbles are pumped into a heater of the secondary crystallizer by a vacuum system along with secondary steam in an evaporation chamber, and are discharged into a secondary condensate tank together with condensate in the secondary heater. The secondary condensate is generally used as reuse water, is produced and supplemented with water, and is relatively pure, and because bubbles can be pumped into a condensing tank together, the secondary condensate contains excessive salt (Cl, SO) 4 2- Etc.) and COD, and the quality index of the effluent of the secondary condensate tank is unqualified, and the recovery of the unqualified condensate in the part can cause the increase of system load, so that the condensate is blocked from being sent out, the production of the previous working procedure is affected, and the condensate is completely recovered into the evaporation crystallizer, thereby increasing the load of the device.
Disclosure of Invention
The utility model aims to provide a one-effect evaporation crystallization device which can reduce the consumption of mother liquor, save steam cost, improve the yield of sodium sulfate and the processing capacity of a system and simultaneously ensure that the system stably operates.
The utility model discloses a one-effect evaporation crystallization device, which comprises an evaporation chamber, a spraying device, a heater, a circulating pipe and a condensate water tank; a steam outlet is formed in the top of the evaporation chamber, and a mother liquor outlet is formed in the side wall of the middle of the evaporation chamber; the bottom of the evaporation chamber is communicated with salt legs, and the salt legs are sequentially provided with a crystal slurry outlet and an emptying port from top to bottom; a steam inlet is formed in the side wall, close to the evaporating chamber, of the heater, and a condensed water outlet is formed in the side wall, far away from the evaporating chamber, of the heater; the spraying device comprises a spraying pipe, a spray head and a spraying valve; the evaporation chamber is communicated with the bottom end of the heater through the circulating pipe, a circulating pump is arranged at the joint of the bottom end of the heater and the circulating pipe, and a material inlet and a mother liquor return opening are formed in the vertical section of the circulating pipe; a guide cylinder is vertically arranged in the evaporation chamber, a bottom cylinder opening of the guide cylinder is communicated with one end of a connecting pipe, and the other end of the connecting pipe passes through the inner wall of the evaporation chamber in a sealing way and is communicated with the top end of the heater; the condensed water outlet is communicated with the inlet of the condensed water tank through a condensed water inlet pipe, and the water outlet at the bottom of the condensed water tank is communicated with one end of the spray pipe through a condensed water pump; the spray head is fixed in the evaporation chamber above the guide cylinder, the other end of the spray pipe passes through the side wall of the evaporation chamber in a sealing way and is communicated with the spray head, and the spray pipe is provided with a spray valve.
Further, the spray head is a high-pressure spray nozzle.
Further, the evaporator further comprises a foam catcher and a baffle plate, wherein the baffle plate and the foam catcher are sequentially arranged in the evaporation chamber above the spray head from bottom to top.
Further, a sampling port is formed in the horizontal section of the circulating pipe by the heater, and a discharging valve is arranged on the sampling port.
Further, the vacuum pump is further included, an exhaust pipeline is communicated with the top of the condensate water tank, and the vacuum pump is installed on the exhaust pipeline.
The utility model has the advantages that: the utility model increases the stable running time of the system from 20 days to about 25 days by additionally arranging the spraying device in the evaporating chamber of the one-effect evaporating and crystallizing device. The steam consumption is saved by about 27 tons per month, and the steam cost is saved by about 2241 yuan. The cleaning frequency is reduced by 10 times every year, so that the recovery amount of mother liquor is reduced, and the system operation is more stable.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow diagram of the system of the present utility model.
The evaporation chamber 1, the foam catcher 101, the baffle plate 102, the steam outlet 103, the mother liquor outlet 104, the mother liquor return 105, the heater 2, the steam inlet 201, the condensate outlet 202, the circulation pipe 3, the circulation pump 301, the material inlet 302, the discharge valve 303, the sampling port 304, the spray pipe 4, the spray valve 401, the spray head 5, the condensate water tank 6, the condensate water inlet pipe 601, the condensate water outlet pipe 602, the condensate water pump 603, the salt leg 7, the crystal slurry outlet 706, the evacuation port 707, the guide cylinder 8, the connection pipe 9, the exhaust pipe 10 and the vacuum pump 1001.
Detailed Description
As shown in FIG. 1, a one-effect evaporative crystallization device comprises an evaporation chamber 1, a spraying device, a heater 2, a circulating pipe 3 and a condensate water tank 6; a steam outlet 103 is formed in the top of the evaporation chamber 1, a mother liquor outlet 104 is formed in the side wall of the evaporation chamber 1, salt legs 7 are communicated with the bottom of the evaporation chamber 1, and a crystal slurry outlet 706 and an emptying port 707 are sequentially formed in the salt legs 7 from top to bottom; the slurry outlet 706 is used to collect crystallized crystals and remaining solution, and the evacuation port 707 is used to evacuate the material and liquid from the evaporation chamber 1.
A guide cylinder 8 is vertically arranged in the evaporation chamber 1, a bottom cylinder opening of the guide cylinder 8 is communicated with one end of a connecting pipe 9, and the other end of the connecting pipe 9 passes through the inner wall of the evaporation chamber 1 in a sealing way and is communicated with the top end of the heater 2. A mist eliminator 101 and a baffle 102 are provided in this order below the steam outlet 103. The foam catcher 101 can filter not only larger foam suspended in the airflow, but also smaller and tiny foam, and the baffle 102 can change the flow direction of the fluid, increase turbulence, reduce dead zone, lengthen flow path and improve heat exchange effect.
A circulating pipe 3 is also communicated between the evaporation chamber 1 and the heater 2, a circulating pump 301 is arranged at the joint of the heater 2 and the circulating pipe 3, and materials circulate in the circulating pipe 3 and the evaporation chamber 1 through the circulating pump 301, so that the materials and the heater 2 fully exchange heat, and the heating concentration is realized. A material inlet 302 and a mother liquor return opening 105 are formed in the vertical section of the circulating pipe 3, the mother liquor outlet 104 and the mother liquor return opening 105 are connected through a pipeline, and the circulating is carried out by using a pump; a sampling port 304 is arranged at the horizontal section of the circulating pipe 3 and is controlled by a discharging valve 303. A vacuum pump 1001 for discharging gas in condensed water is installed in the exhaust pipe 10 of the condensed water tank 6. A steam inlet 201 is formed in the side wall of the heater 2, which is close to the evaporating chamber 1, a condensed water outlet 202 is formed in the side wall of the heater, which is far away from the evaporating chamber 1, and the condensed water outlet 202 is communicated with the water inlet of the condensed water tank 6 through a condensed water inlet pipe 601.
The spraying device comprises a spraying pipe 4, a spray head 5 and a spraying valve 401; a spray head 5 is fixed in the evaporation chamber 1 above the guide cylinder 8, the spray head 5 is a high-pressure nozzle, and the spraying direction is downward spraying for flushing the inner wall of the evaporation chamber 1. One end of the spray pipe 4 passes through the side wall of the evaporation chamber 1 in a sealing way and is communicated with the spray head 5, and the other end of the spray pipe 4 is communicated with a condensed water outlet pipe 602 of the condensed water tank 6 through a condensed water pump 603. The shower pipe 4 is provided with a shower valve 401 for controlling the flow rate of the condensed water. The spraying device reduces the cleaning frequency of the evaporation chamber 1, and reduces the discharge amount of mother liquor, so that the system is more stable to operate.
The working flow is as follows:
the material is pumped into the evaporation chamber 1 from the material inlet 302 on the circulation pipe 3 under the action of the circulation pump 301, and circularly flows in the circulation pipe 3 and the evaporation chamber 1, so that the material and the heater 2 fully exchange heat, and the heating concentration is realized. In the evaporation process, steam is discharged from a steam outlet 103 at the top of the evaporation chamber 1, condensed water formed in the heater 2 enters the condensed water tank 6 through a condensed water inlet pipe, and the condensed water in the condensed water tank 6 is pressurized to the spray pipe 4 and the spray head 5 through a condensed water pump 603 so as to wash and clean salt scale on the tank wall of the evaporation chamber 1.
The following table shows the comparison of various data before and after the present utility model is adopted:
table 1 comparison of data before and after installation of spray device in a one-effect crystallizer
As can be seen from Table 1, the prior art is a stable system operation, one-effect crystallizerAfter the improvement, namely after the evaporation chamber 1 is added with a spraying device, the tank wall at the upper part of the evaporation chamber 1 is cleaned regularly, and salt scale formed on the tank wall is washed and dissolved. The monthly cleaning frequency can be reduced to 2 times. Due to the reduction of the discharge amount of the mother liquor, the fluctuation of the operation condition of the system caused by mother liquor recovery is reduced, and the operation of the system is more stable. Before improvement, the total mother liquor discharge amount generated by the primary crystallizer cleaning operation per month is 312m 3 The amount of steam required for this mother liquor recovery was 187.2T. The mother liquor discharge amount per month after improvement can be reduced by about 40m 3 The steam consumption required by mother liquor recovery is 160.2T, and 27T of steam consumption can be saved per month. The average month yield of sodium sulfate before improvement is 366.127T, and the average month value of evaporation capacity is 11.475m 3 And/h, the month yield of the improved sodium sulfate is 431.213T, and the average month value of the evaporation capacity is 12.23m 3 And/h, the net improvement of the evaporation crystallization treatment capacity is 0.755m 3 And/h, the month yield of sodium sulfate is improved by 62.086T.
The inner tank wall of the evaporation chamber 1 is regularly flushed by adopting the spraying device, so that the separation space of feed liquid and secondary vapor and liquid in the evaporation chamber 1 can be effectively increased, the processing capacity of the system is further improved, the yield of sodium sulfate is improved, the evaporation capacity is also provided with an improvement space, and the steam cost is expected to be saved by about 2241 yuan per month.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (5)
1. The one-effect evaporation crystallization device is characterized by comprising an evaporation chamber, a spraying device, a heater, a circulating pipe and a condensate water tank;
a steam outlet is formed in the top of the evaporation chamber, and a mother liquor outlet is formed in the side wall of the middle of the evaporation chamber; the bottom of the evaporation chamber is communicated with salt legs, and the salt legs are sequentially provided with a crystal slurry outlet and an emptying port from top to bottom; a steam inlet is formed in the side wall, close to the evaporating chamber, of the heater, and a condensed water outlet is formed in the side wall, far away from the evaporating chamber, of the heater;
the spraying device comprises a spraying pipe, a spray head and a spraying valve;
the evaporation chamber is communicated with the bottom end of the heater through the circulating pipe, a circulating pump is arranged at the joint of the bottom end of the heater and the circulating pipe, and a material inlet and a mother liquor return opening are formed in the vertical section of the circulating pipe; a guide cylinder is vertically arranged in the evaporation chamber, a bottom cylinder opening of the guide cylinder is communicated with one end of a connecting pipe, and the other end of the connecting pipe passes through the inner wall of the evaporation chamber in a sealing way and is communicated with the top end of the heater;
the condensed water outlet is communicated with the inlet of the condensed water tank through a condensed water inlet pipe, and the water outlet at the bottom of the condensed water tank is communicated with one end of the spray pipe through a condensed water pump; the spray head is fixed in the evaporation chamber above the guide cylinder, the other end of the spray pipe passes through the side wall of the evaporation chamber in a sealing way and is communicated with the spray head, and the spray pipe is provided with the spray valve.
2. A one-effect evaporative crystallisation apparatus according to claim 1, wherein the spray head is a high pressure nozzle.
3. The one-effect evaporative crystallization device according to claim 1, further comprising a foam catcher and a baffle plate, wherein the baffle plate and the foam catcher are sequentially arranged in the evaporation chamber above the spray head from bottom to top.
4. The one-effect evaporative crystallization device according to claim 1, wherein the heater is provided with a sampling port at a horizontal section of the circulating pipe, and a discharge valve is installed on the sampling port.
5. The one-effect evaporative crystallization device according to claim 1, further comprising a vacuum pump, wherein an exhaust pipeline is communicated with the top of the condensate water tank, and the vacuum pump is installed on the exhaust pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320217424.8U CN219231438U (en) | 2023-02-07 | 2023-02-07 | One-effect evaporation crystallization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320217424.8U CN219231438U (en) | 2023-02-07 | 2023-02-07 | One-effect evaporation crystallization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219231438U true CN219231438U (en) | 2023-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320217424.8U Active CN219231438U (en) | 2023-02-07 | 2023-02-07 | One-effect evaporation crystallization device |
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| CN (1) | CN219231438U (en) |
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- 2023-02-07 CN CN202320217424.8U patent/CN219231438U/en active Active
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