CN110302551B - Device and method for recycling phosphorus-containing wastewater of yellow phosphorus vacuum rectification system - Google Patents
Device and method for recycling phosphorus-containing wastewater of yellow phosphorus vacuum rectification system Download PDFInfo
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- CN110302551B CN110302551B CN201910563175.6A CN201910563175A CN110302551B CN 110302551 B CN110302551 B CN 110302551B CN 201910563175 A CN201910563175 A CN 201910563175A CN 110302551 B CN110302551 B CN 110302551B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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Abstract
The invention discloses a device and a method for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification vacuum system, wherein the device comprises a phosphorus-containing wastewater collecting tank, a first cold water tank, a heat exchanger, a second cold water tank, a vacuum water tank and a water chilling unit; the phosphorus-containing wastewater collection tank is connected with the first cold water tank; the first cold water tank is connected with the heat exchanger, the heat exchanger is connected with the second cold water tank, the second cold water tank is connected with the vacuum water tank, and the vacuum water tank and the phosphorus-containing wastewater collecting tank form a circulating pipeline. The device simple structure, high-efficient recycle. The invention also discloses a method for recycling the phosphorus-containing wastewater of the yellow phosphorus vacuum rectification vacuum system, after the phosphorus-containing wastewater is collected, the phosphorus-containing wastewater is recycled through three-stage cooling, the cooling effect is good, the vacuum pump operates normally, the rectification system is stable, no clear water is added and no wastewater is generated, and the problems of unstable vacuum degree of the rectification system and generation of the phosphorus-containing wastewater are solved.
Description
Technical Field
The invention belongs to the field of environment-friendly recycling of yellow phosphorus wastewater, and particularly relates to a device and a method for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification vacuum system.
Background
At present, the domestic high-purity yellow phosphorus production technology mainly utilizes a rectification principle to remove heavy metal ions (heavy components) in the yellow phosphorus, a water ring vacuum pump is adopted by a rectification vacuum system device, and the vacuum degree of the system is unstable due to high temperature of working fluid in the operation process of the vacuum pump, so that the fluctuation of the whole production system is caused, and the normal start of yellow phosphorus rectification is seriously influenced. In order to ensure the normal operation of the vacuum pump, clear water is required to be continuously added to replace working solution of the vacuum pump, a large amount of yellow phosphorus wastewater can be generated, the production pressure is huge under the current severe environment-friendly situation, the phosphorus wastewater treatment difficulty is large, and the treatment cost is very high.
Disclosure of Invention
The invention aims to provide a device and a method for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification vacuum system, and the method has the characteristics of simple process, safety and environmental protection.
In order to achieve the purpose, the invention provides the following specific scheme:
a device for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification vacuum system comprises a phosphorus-containing wastewater collecting tank, a first cold water tank, a second cold water tank, a heat exchanger, a cold water unit and a vacuum water tank, wherein the phosphorus-containing wastewater collecting tank is connected with the first cold water tank; the first cold water tank is connected with the heat exchanger, the heat exchanger is connected with the second cold water tank, the second cold water tank is connected with the vacuum water tank, and the vacuum water tank and the phosphorus-containing wastewater collecting tank form a circulating pipeline.
The first cold water tank is further connected with a second cold water tank, the second cold water tank is connected with a water chilling unit, the water chilling unit is connected with the first cold water tank, and the first cold water tank is connected with the second cold water tank to form a circulating pipeline.
The first cold water tank is further connected with a second cold water tank, the second cold water tank is connected with a water chilling unit, the water chilling unit is connected with a heat exchanger, and the heat exchanger is connected with the second cold water tank to form a circulating pipeline.
The first cold water tank is connected with the heat exchanger through the pump, the heat exchanger is connected with the first cold water tank, and the first cold water tank is further connected with the vacuum water tank to form a circulating pipeline.
The first cold water tank is also connected with the second cold water tank.
Cooling coils are arranged inside the first cold water and the second cold water;
the vacuum water tank is provided with a temperature sensor and a liquid level sensor.
The vacuum water tank is provided with an overflow pipe communicated with the phosphorus-containing wastewater collecting tank.
The water chilling unit is interlocked with the vacuum water tank temperature sensor.
The cold water tank 1 is provided with a pipeline overflowing to the vacuum water tank.
The method for recycling the phosphorus-containing wastewater by adopting the device comprises the following specific steps:
(1) sending the wastewater in the phosphorus-containing wastewater collecting tank to a first cold water tank;
(2) starting a delivery pump from the second cold water tank to the heat exchanger, and cooling cold water in the heat exchanger by 25-30 ℃;
(3) a part of the cooling water cooled by the heat exchanger enters a coil of a second cold water tank and is cooled to 18-25 ℃ again; one part of the phosphorus-containing wastewater enters a first cold water tank, and the phosphorus-containing wastewater pumped from the phosphorus-containing wastewater collecting tank can be reduced to 30-35 ℃;
a part of the cooling water cooled by the heat exchanger enters a coil of a second cold water tank and is cooled again, and the water temperature ranges from 18 ℃ to 25 ℃; and the other part of the phosphorus-containing wastewater enters the cold water tank, is cooled again through an internal coil (cooling water outlet of a water chilling unit), and then enters the heat exchanger after the phosphorus-containing wastewater pumped from the phosphorus-containing wastewater collecting tank is cooled to 30-35 ℃.
(4) Cooling water in the second cold water tank enters a water chilling unit through a delivery pump to be cooled by 10-15 ℃, a part of cooled cooling water enters a heat exchanger to be used as cooling inlet water of the heat exchanger, and a part of cooled cooling water enters a coil pipe of the first cold water tank;
and cooling water in the second cold water tank enters a water chilling unit through a delivery pump to be cooled by 10-15 ℃, a part of the cooled cooling water enters a heat exchanger to be used as cooling inlet water of the heat exchanger, and a part of the cooled cooling water enters a coil pipe of the first cold water tank to cool the phosphorus-containing wastewater in the phosphorus-containing wastewater tank and then enters the water chilling unit to be cooled, so that the load of the water chilling unit is reduced.
(5) Cooling water of the first cold water tank overflows to the vacuum water tank, and coil water of the first cold water tank returns to the second cold water tank;
(6) cooling the phosphorus-containing wastewater in the first cold water tank to 32-36 ℃ through an internal coil pipe, then entering a heat exchanger, opening the coil pipe of the second cold water tank, cooling for three times, and finally entering a vacuum water tank;
(7) and overflowing the phosphorus-containing wastewater in the vacuum water tank to a phosphorus-containing wastewater collecting tank for recycling.
In the step (4), the set temperature of the cold water machine set is 10-15 ℃, and the effluent of the cold water is 10-15 ℃.
And (4) cooling for three times in the step (6), wherein the water temperature in the vacuum water tank is 18-25 ℃.
By adopting the technical scheme of the invention, the utilization rate of the phosphorus-containing wastewater can reach 100%.
In the phosphine-containing wastewater treatment process by adopting the device disclosed by the invention, the temperature of the working liquid can safely operate the water ring vacuum pump. The ambient temperature is generally high in summer, the temperature of circulating water can reach 33 ℃, the cooling effect is extremely poor by adopting the method, and the temperature of working fluid is ultrahigh even reaches 40 ℃ by adding the heat generated by the rotation of the pump and the heat transferred by the pumped vapor-liquid mixture. The water ring vacuum pump can run under high vacuum, the temperature of working solution is higher, water in the pump is close to boiling and generates a large amount of bubbles, the generation and the rupture process of the bubbles can cause cavitation damage to the impeller, the dynamic balance of the impeller is damaged, the strong vibration of the pump body is caused, and very large cavitation noise occurs, and the conditions seriously affect the safe running of the water ring vacuum pump.
The pumping capacity of the water ring vacuum pump is mainly influenced by the temperature of working liquid of the water ring vacuum pump, and the negative pressure of the rectifying device is directly influenced by the pumping capacity of the water ring vacuum pump. When the temperature of the working fluid rises, the working fluid is vaporized, so that part of gas from the vaporization of the working fluid is contained in the closed crescent cavity of the water ring vacuum pump, and the suction amount of the rectifying device is reduced, thereby influencing the negative pressure of the rectifying device system.
(1) By the device and the method, the temperature of the working fluid is lower than 30 ℃, the service life of the seal and the bearing of the water ring vacuum pump is prolonged, the mean fault interval time of the water ring vacuum pump is prolonged, and the fault rate is reduced.
(2) By the device and the method, the yellow phosphorus wastewater in the phosphorus wastewater collecting tank is conveyed by the pump and enters the vacuum water tank after being cooled for three times, the temperature of the working liquid of the pump is in a normal range, so that the vacuum pump operates stably and continuously, the suction capacity of the water ring vacuum pump is normal, the negative pressure in a vacuum system and a rectifying tower of the rectifying device is normal and stable, and the decompression rectifying device is ensured to be started continuously and normally.
Drawings
FIG. 1 shows a device for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification vacuum system, wherein 1 is a phosphorus-containing wastewater collection tank, 2 is a first cold water tank, 3 is a heat exchanger, 4 is a second cold water tank, 5 is a vacuum water tank, and 6 is a water chilling unit.
Fig. 2 shows a device for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification vacuum system in example 4, wherein a 1 'yellow phosphorus wastewater collection tank is subjected to temperature interlocking, a 3' heat exchanger is subjected to water replenishing interlocking, and a 5 'vacuum water tank and a 6' water chilling unit are subjected to water replenishing interlocking.
FIG. 3 shows an apparatus for recycling phosphorus-containing wastewater from a vacuum distillation system for yellow phosphorus in example 5, wherein 1 ″. wastewater containing yellow phosphorus is collected, 2 ″. cold water tank, 3 ″. heat exchanger, 4 ″. temperature interlock, 5 ″. vacuum water tank, 6 ″. cold water set, and 7 ″. interlock water supplement.
Detailed Description
Example 1
As shown in figure 1, the device for treating phosphorus-containing wastewater by using a yellow phosphorus vacuum rectification vacuum system comprises a phosphorus-containing wastewater collecting tank 1, a first cold water tank 2, a second cold water tank 4, a heat exchanger 3, a water chilling unit 6 and a vacuum water tank 5, wherein the phosphorus-containing wastewater collecting tank 1 is connected with the first cold water tank 2; the first cold water tank 2 is connected with the heat exchanger 3, the heat exchanger 3 is connected with the second cold water tank 4, the second cold water tank 4 is connected with the vacuum water tank 5, and the vacuum water tank 5 and the phosphorus-containing wastewater collecting tank 1 form a circulating pipeline.
The first cold water tank 2 is further connected with the second cold water tank 4, the second cold water tank 4 is connected with the cold water unit 6, the cold water unit 6 is connected with the first cold water tank 2, and the first cold water tank 2 is connected with the second cold water tank 4 to form a circulating pipeline.
The first cold water tank 2 is further connected with the second cold water tank 4, the second cold water tank 4 is connected with the cold water unit 6, the cold water unit 6 is connected with the heat exchanger 3, and the heat exchanger 3 is connected with the second cold water tank 4 to form a circulating pipeline.
The first cold water tank 2 is connected with the heat exchanger 3 through a pump, the heat exchanger 3 is connected with the first cold water tank 2, and the first cold water tank 2 is further connected with the vacuum water tank 5 to form a circulating pipeline.
Cooling coils are arranged inside the cold water tanks 1 and 2; the vacuum water tank is provided with a temperature sensor and a liquid level sensor. The vacuum water tank is provided with an overflow pipe communicated with the phosphorus-containing wastewater collecting tank. The water chilling unit is interlocked with the vacuum water tank temperature sensor.
Example 2
The method for recycling the phosphorus-containing wastewater by adopting the device in the embodiment 1 (the device corresponding to the method is shown in the attached figure 1 in the specification), which comprises the following specific steps:
(1) sending the wastewater in the phosphorus-containing wastewater collecting tank 1 to a first cold water tank 2;
(2) starting a delivery pump from the first cold water tank 2 to the heat exchanger 3, and cooling cold water in the heat exchanger 3 by 25 ℃;
(3) a part of the cooling water cooled by the heat exchanger 3 enters a coil of a second cold water tank 4 and is cooled to 12 ℃ again; one part of the phosphorus-containing wastewater enters a first cold water tank 2, and the phosphorus-containing wastewater pumped from the phosphorus-containing wastewater collecting tank can be reduced to 32 ℃;
(4) cooling water in the second cold water tank 4 enters the water chilling unit 6 through the delivery pump to be cooled by 12 ℃, a part of the cooled cooling water enters the heat exchanger 3 to be used as cooling inlet water of the heat exchanger, and a part of the cooled cooling water enters the coil pipe of the first cold water tank 2;
(5) the cooling water of the first cold water tank 2 overflows to the vacuum water tank, and the coil water of the first cold water tank 2 returns to the second cold water tank;
(6) cooling the phosphorus-containing wastewater in the first cold water tank 2 to 35 ℃ through an internal coil, then entering the heat exchanger 3, opening a coil going to the second cold water tank 4, cooling for three times until the water temperature reaches 20 ℃, and finally entering the vacuum water tank 5;
(7) and the phosphorus-containing wastewater in the vacuum water tank 5 overflows to the phosphorus-containing wastewater collecting tank 1 and is recycled.
The phosphorus-containing wastewater at 20 ℃ is used as the working solution of the vacuum pump, the vacuum pump runs stably without noise, the current does not fluctuate, and the rectification system is vacuum-stable.
Example 3 (the corresponding device of the method is shown in the attached figure 1 of the specification)
(1) Sending the wastewater in the phosphorus-containing wastewater collecting tank to a first cold water tank;
(2) starting a delivery pump from the second cold water tank to the heat exchanger, and cooling cold water in the heat exchanger by 25 ℃;
(3) sending the cooling water of the second cold water tank into a water chilling unit, setting parameters, setting the temperature to be 15 ℃, discharging the coolant to be 15 ℃, and cooling;
(4) opening a valve on the cooling water delivery pipe, introducing a part of cooling water of the water chilling unit into the tubular heat exchanger, and then entering the cold water tank II; the other part is divided into a coil pipe of the first cooling water tank and then returns to the second cooling water tank;
(5) the phosphorus-containing wastewater in the first cold water tank is cooled by the internal coil, enters the heat exchanger, enters the second cold water tank coil after being opened, is cooled for three times, and finally enters the vacuum water tank. Phosphorus-containing wastewater at 20 ℃ is used as a working solution of the vacuum pump.
(6) And overflowing the phosphorus-containing wastewater in the vacuum water tank to a phosphorus-containing wastewater collecting tank for recycling.
The phosphorus-containing wastewater at 20 ℃ is used as the working solution of the vacuum pump, the vacuum pump runs stably without noise, the current does not fluctuate, and the rectification system is vacuum-stable.
Example 4 (the corresponding device of the method is shown in the attached figure 2 of the specification)
A device for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification vacuum system comprises a phosphorus-containing wastewater collecting tank, a heat exchanger, a vacuum water tank and a water chilling unit. The vacuum water tank 5 'is connected with the heat exchanger 3', and the water chilling unit 6 'is connected with the heat exchanger 3'. The method comprises the following specific steps:
the phosphorus-containing wastewater in the vacuum water tank 5 ' directly passes through the heat exchanger 3 ' for primary cooling and then returns to the vacuum water tank 5 '. The circulating water is refrigerated by the supercooled water unit 6 'and then is used as a refrigerant of the heat exchanger 3', and the outlet water of the refrigerant is 13 ℃. The temperature of the water entering the vacuum tank 5 'via the heat exchanger 3' may be reduced to 34 ℃. The phosphorus-containing wastewater at 34 ℃ is used as the working solution of the vacuum pump, the vacuum pump operates with gapped abnormal sound, the current slightly fluctuates, and the vacuum of the rectification system slightly fluctuates.
Example 5 (the corresponding device of the method is shown in the attached figure 3 of the specification)
A device for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification vacuum system comprises a phosphorus-containing wastewater collecting tank 1 ', a cold water tank 2 ', a heat exchanger 3 ', a vacuum water tank 5 ' and a water chilling unit 6 ', wherein the phosphorus-containing wastewater collecting tank 1 ' is connected with the cold water tank 2 ', the cold water tank 2 ' is connected with the heat exchanger 3 ', the heat exchanger 3 ' is connected with the vacuum water tank 5 ', and the vacuum water tank 5 ' is connected with the phosphorus-containing wastewater collecting tank 1 '; the water chiller 6 'is connected to the heat exchanger 3', and the water chiller 6 'is connected to the cold water tank 2'. The method comprises the following specific steps:
(1) the phosphorus-containing wastewater is conveyed to a cold water tank 2 ', a coil is arranged in the cold water tank 2 ', a refrigerant refrigerated by a water chilling unit 6 ' is arranged in the coil, and the temperature is reduced to 35 ℃ once;
(2) then enters the heat exchanger 3 '' to be cooled to 31 ℃. The phosphorus-containing wastewater at 31 ℃ is used as the working solution of the vacuum pump, the vacuum pump runs stably without noise, the current slightly fluctuates, and the vacuum of the rectification system is stable.
Claims (7)
1. A method for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification vacuum system is characterized by comprising the following steps:
(1) sending the wastewater in the phosphorus-containing wastewater collecting tank to a first cold water tank;
(2) starting a delivery pump from the second cold water tank to the heat exchanger, and cooling cold water to 25-30 ℃ in the heat exchanger;
(3) a part of the cooling water cooled by the heat exchanger enters a coil of a second cold water tank and is cooled to 18-25 ℃ again; one part of the phosphorus-containing wastewater enters a first cold water tank, and the phosphorus-containing wastewater pumped from the phosphorus-containing wastewater collecting tank can be reduced to 30-35 ℃;
(4) cooling water in the second cold water tank enters a water chilling unit through a delivery pump to be cooled to 10-15 ℃, a part of cooled cooling water enters a heat exchanger to be used as cooling inlet water of the heat exchanger, and a part of cooled cooling water enters a coil pipe of the first cold water tank;
(5) cooling water of the first cold water tank overflows to the vacuum water tank, and coil water of the first cold water tank returns to the second cold water tank;
(6) cooling the phosphorus-containing wastewater in the first cold water tank to 32-36 ℃ through an internal coil pipe, then entering a heat exchanger, opening the coil pipe of the second cold water tank, cooling for three times, and finally entering a vacuum water tank;
(7) and overflowing the phosphorus-containing wastewater in the vacuum water tank to a phosphorus-containing wastewater collecting tank for recycling.
2. The method for recycling the phosphorus-containing wastewater of the yellow phosphorus vacuum rectification system as claimed in claim 1, wherein the temperature of the cooling water unit in the step (4) is set to be 10-15 ℃ and the effluent of the cooling water is 10-15 ℃.
3. The method for recycling the phosphorus-containing wastewater in the vacuum rectification system of yellow phosphorus according to claim 1, wherein the cooling in the step (6) is performed three times, and the water temperature in the vacuum water tank is 18-25 ℃.
4. The method for recycling the phosphorus-containing wastewater of the yellow phosphorus vacuum rectification system as claimed in claim 1, wherein the phosphorus-containing wastewater recycling device of the yellow phosphorus vacuum rectification system adopted in the recycling device comprises a phosphorus-containing wastewater collection tank (1), a first cooling water tank (2), a heat exchanger (3), a second cooling water tank (4), a vacuum water tank (5) and a water chilling unit (6); the phosphorus-containing wastewater collection tank is characterized in that a phosphorus-containing wastewater collection tank (1) is connected with a first cold water tank (2); the first cold water tank (2) is connected with the heat exchanger (3), the heat exchanger (3) is connected with the second cold water tank (4), the second cold water tank (4) is connected with the vacuum water tank (5), and the vacuum water tank (5) and the phosphorus-containing wastewater collecting tank (1) form a circulating pipeline.
5. The method for recycling phosphorus-containing wastewater of the yellow phosphorus vacuum rectification system as claimed in claim 4, wherein the first cold water tank (2) is further connected with the second cold water tank (4), the second cold water tank (4) is connected with the water chilling unit (6), the water chilling unit (6) is connected with the first cold water tank (2), and the first cold water tank (2) is connected with the second cold water tank (4) to form a circulating pipeline.
6. The method for recycling phosphorus-containing wastewater of the yellow phosphorus vacuum rectification system as claimed in claim 4, wherein the first cold water tank (2) is further connected with the second cold water tank (4), the second cold water tank (4) is connected with the water chilling unit (6), the water chilling unit (6) is connected with the heat exchanger (3), and the heat exchanger (3) is connected with the second cold water tank (4) to form a circulating pipeline.
7. The method for recycling phosphorus-containing wastewater of a yellow phosphorus vacuum rectification system as claimed in claim 4, wherein the first cold water tank (2) is connected with the heat exchanger (3) through a pump, the heat exchanger (3) is connected with the first cold water tank (2), and the first cold water tank (2) is further connected with the vacuum water tank (5) to form a circulating pipeline.
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| CN106151065A (en) * | 2016-08-31 | 2016-11-23 | 中国大冢制药有限公司 | Water-ring vacuum pump working solution recovery system |
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2019
- 2019-06-26 CN CN201910563175.6A patent/CN110302551B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201694835U (en) * | 2010-06-12 | 2011-01-05 | 南通宝钢钢铁有限公司 | Air separation precooling pure water circulating system |
| CN204100682U (en) * | 2014-02-28 | 2015-01-14 | 珠海裕田化工制品有限公司 | A kind of public work cooling circulating water system |
| CN105381623A (en) * | 2015-12-04 | 2016-03-09 | 陕西宝塔山新材料有限公司 | Cooling water circulation method and circulation system for rectification vacuum system |
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Address after: 443007 no.66-3, Yiting Avenue, Yiting District, Yichang City, Hubei Province Patentee after: Hubei Xingfu Electronic Materials Co.,Ltd. Address before: 443007 no.66-3, Yiting Avenue, Yiting District, Yichang City, Hubei Province Patentee before: HUBEI SINOPHORUS ELECTRONIC MATERIALS CO.,LTD. |