CN108786169B - Crystallization system and method for liquid substance - Google Patents
Crystallization system and method for liquid substance Download PDFInfo
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- CN108786169B CN108786169B CN201810802976.9A CN201810802976A CN108786169B CN 108786169 B CN108786169 B CN 108786169B CN 201810802976 A CN201810802976 A CN 201810802976A CN 108786169 B CN108786169 B CN 108786169B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
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Abstract
The invention relates to the field of crystallization, and discloses a crystallization system and a method for a liquid substance, wherein the crystallization system comprises a crystallization tank, a circulating pump, a cooling tower and a water tank; still include the condenser, the crystallizer passes through first pipeline and condenser intercommunication, installs air exhaust device on the first pipeline, still is equipped with the second pipeline between crystallizer and the condenser, installs the check valve on the second pipeline, and the condenser condensation crystallizer in the steam of evaporation is connected with the cooling tower through the pipeline, and in the cooling tower carries the basin through the pipeline after handling liquid water cooling, the circulating pump is with in the cold water pumping of basin is sent the condenser. The high-pressure fan or the steam compressor is used for replacing a traditional steam jet pump to suck steam, a large amount of heat brought by working steam is reduced to a cooling system, and the cooling load is reduced. Through parallelly connected a check valve, furthest utilizes the cold volume of environment to come the steam of condensation crystallizer output, only when steam temperature drops to when being close ambient temperature, just drops into high pressure positive blower or vapor compressor work.
Description
Technical Field
The invention relates to the field of crystallization, in particular to a crystallization system and a crystallization method for a liquid substance.
Background
In the traditional titanium liquid crystallization method, steam in a crystallization tank is pumped out through vacuum equipment such as a steam jet pump, the steam in the crystallization tank is heated, pressurized and discharged, and then the pumped steam is condensed by cooling water. The problems of the method are that:
1. the steam is used as the power for vacuumizing, and a large amount of latent heat of vaporization is brought into the system, so that the consumption of cooling water is increased.
2. When the temperature in the crystallization tank is reduced, the vacuum degree in the crystallization tank is extremely high, and the steam is very thin, for example, when the temperature of the titanium liquid in the crystallization tank is reduced to 20 ℃, the saturated steam temperature is only about 17 ℃, and the corresponding saturated steam density is only 15.35 g/square, namely, every time the steam jet pump sucks 1 square steam from the crystallization tank, the titanium liquid in the crystallization tank evaporates 15 g of water. 1 ton of titanium dioxide is produced, 1.05 ton of water needs to be evaporated from a crystallizing tank in a crystallizing section, and therefore a large amount of working steam needs to be consumed in the production process.
Disclosure of Invention
Aiming at the defect of high crystallization cost of liquid substances in the prior art, the invention provides a crystallization system and a crystallization method of the liquid substances.
First we know several common sense issues:
once the temperature of the water vapor is higher than the temperature of the cooling water provided by the atmospheric cooling tower, the atmospheric cooling tower can be used in principle to condense the vapor.
And secondly, the cold water produced by the cooling tower can be below 35 ℃ in places suitable for human activity places.
Therefore, if the saturated steam temperature of the low-temperature steam is increased to more than 35 ℃, the steam can be condensed by using an atmospheric cooling tower with lower cost. The following table is the variation characteristics of the saturated steam temperature of the water vapor at different saturated vapor pressures:
from the above table, it can be seen that the saturated steam temperature of the steam is raised from 0 ℃ to 40 ℃, the saturated steam pressure is raised by only 7.7KPa, while the saturated steam temperature of the steam is raised from 60 ℃ to 100 ℃, although the saturated steam pressure is raised by 40 ℃ and raised by 81KPa, if the temperature is raised by using the mechanical compression steam, the input shaft power is P.Q, that is, the consumed power is equal to the product of the pressure rise and the flow rate. Therefore, the crystallization system is designed, and the average power consumption of 67KW.H of titanium dioxide per ton is measured through trial operation, so that the method has great advantages compared with the traditional titanium liquid vacuum crystallization.
In order to solve the technical problem, the invention is solved by the following technical scheme:
a crystallization system of liquid substances comprises a crystallization tank, a circulating pump, a cooling tower and a water tank; still include the condenser, the crystallizer passes through first pipeline and condenser intercommunication, installs air exhaust device on the first pipeline, still is equipped with the second pipeline between crystallizer and the condenser, installs the check valve on the second pipeline, and the condenser condensation crystallizer in the steam of evaporation is connected with the cooling tower through the pipeline, and in the cooling tower carries the basin through the pipeline after handling liquid water cooling, the circulating pump is with in the cold water pumping of basin is sent the condenser.
Preferably, the air extraction device is a high pressure fan or a vapor compressor.
Preferably, the condenser is a hydraulic ejector or a tube condenser or a hybrid steam condenser.
A method of crystallizing a liquid material comprising the steps of:
step a: hot liquid material is filled into a crystallization tank through a feed valve, when the liquid material reaches a set liquid level, the feed valve and a discharge valve on the crystallization tank are closed, and the crystallization tank forms a sealed container;
step b: starting a circulating pump to pump cold water in a water tank into a condenser, conveying steam in a crystallizing tank into the condenser through a second pipeline, condensing the steam evaporated in the crystallizing tank by the condenser and condensing the steam into liquid water, reducing the steam in the crystallizing tank to reduce the pressure, and continuously boiling liquid substances in the crystallizing tank under low pressure and evaporating the steam;
step c: starting the cooling tower, conveying liquid water formed by the condenser into the cooling tower through a pipeline, and conveying the liquid water into a water tank after cooling treatment by the cooling tower;
step d: the temperature of the hot liquid substance in the crystallization tank is continuously reduced along with the lapse of time, when the temperature of the liquid substance in the crystallization tank is close to the ambient temperature, the air extractor is started, the air extractor extracts the steam in the crystallization tank and conveys the steam to the condenser, the pressure in the crystallization tank is continuously reduced, so that the liquid substance in the crystallization tank is continuously boiled and evaporates the steam, and the liquid substance in the crystallization tank is continuously cooled and crystallized;
step e: when the temperature of the hot liquid substance in the crystallization tank is reduced to 5-25 ℃, the air exhaust device is stopped, and the liquid substance in the crystallization tank is crystallized.
Preferably, the temperature of the hot liquid mass in step a is between 40 ℃ and 90 ℃.
Preferably, the liquid material in the crystallization tank in step b is continuously boiled and the steam is evaporated under a low pressure of 1 to 70 kPa.
Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:
the high-pressure fan or the steam compressor is used for replacing a traditional steam jet pump to suck steam, so that a large amount of heat brought by working steam can be reduced to a cooling system, and the cooling load is reduced.
Under the condition of low temperature, the characteristic of large temperature rise can be obtained by small pressure rise of steam, and the temperature of the steam can be greatly improved by consuming little electric power. Thus, power can be greatly saved.
The method can utilize the environmental cold energy to condense the steam produced by the crystallizing tank to the maximum extent, and only when the temperature of the steam is reduced to be close to the environmental temperature, the high-pressure fan or the steam compressor is put into operation.
Drawings
FIG. 1 is a schematic diagram of the system framework of the present invention.
The names of the parts indicated by the numerical references in the above figures are as follows: the system comprises a crystallization tank 10, a circulating pump 11, a cooling tower 12, a water tank 13, a condenser 14, a first pipeline 15, an air extraction device 16, a second pipeline 17 and a one-way valve 18.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
A crystallization system of liquid material is shown in figure 1, and comprises a crystallization tank 10, a circulating pump 11, a cooling tower 12 and a water tank 13, wherein the crystallization tank 10 is used for evaporating titanium liquid of crystallization heat; the crystallization device comprises a crystallization tank 10, a condenser 14, a first pipeline 15, an air extractor 16, a second pipeline 17, a one-way valve 18 and a water tank 13, wherein the crystallization tank 10 is communicated with the condenser 14 through the first pipeline 15, the air extractor 16 directly pumps steam in the crystallization tank 10 into the condenser 14, the second pipeline 17 is arranged between the crystallization tank 10 and the condenser 14, the one-way valve 18 enables the condenser 14 to condense steam by using an environmental cold source when the environmental temperature is low, the air extractor 16 does not work when the crystallization tank 10 begins to crystallize, the steam in the crystallization tank 10 is directly conveyed into the condenser 14 through the second pipeline 17, the condenser 14 condenses steam evaporated in the crystallization tank 10 and is connected with the cooling tower 12 through a pipeline, the condenser 14 condenses through the condenser 14 to form liquid water and conveys the liquid water into the cooling tower 12, and conveys the liquid water into the water tank 13 through a pipeline, the circulation pump 11 pumps the cold water in the water tank 13 into the condenser 14.
The air extraction device 16 is a high pressure fan.
The condenser 14 is a water ejector or a tube condenser or a hybrid steam condenser.
A method of crystallizing a liquid material comprising the steps of:
step a: hot liquid material is filled into the crystallizing tank 10 through a feeding valve, when the liquid material reaches a set liquid level, the feeding valve and a discharging valve on the crystallizing tank 10 are closed, and the crystallizing tank 10 forms a sealed container;
step b: starting a circulating pump 11 to pump cold water in a water tank 13 into a condenser 14, conveying steam in the crystallization tank 10 into the condenser 14 through a second pipeline 17, condensing the steam evaporated in the crystallization tank 10 by the condenser 14 and condensing the steam into liquid water, reducing the steam in the crystallization tank 10 to reduce the pressure, and continuously boiling the liquid substance in the crystallization tank 10 at low pressure and evaporating the steam;
step c: starting the cooling tower 12, conveying liquid water formed by the condenser 14 into the cooling tower 12 through a pipeline, and conveying the liquid water into the water tank 13 after the cooling tower 12 carries out cooling treatment on the liquid water;
step d: the temperature of the hot liquid substance in the crystallization tank 10 is continuously reduced along with the time, when the temperature of the liquid substance in the crystallization tank 10 is close to the ambient temperature, the air extraction device 16 is started, the air extraction device 16 extracts the steam in the crystallization tank 10 and conveys the steam to the condenser 14, the pressure in the crystallization tank 10 is continuously reduced, so that the liquid substance in the crystallization tank 10 is continuously boiled and evaporates the steam, and the liquid substance in the crystallization tank 10 is continuously cooled and crystallized;
step e: when the temperature of the hot liquid substance in the crystallization tank 10 is reduced to 5 ℃, the air exhaust device 16 is stopped, and the crystallization of the liquid substance in the crystallization tank 10 is finished.
The temperature of the hot liquid mass in step a was 40 ℃.
The liquid material in the crystallization tank 10 in step b is continuously boiled at a low pressure of 1kPa and the vapor is evaporated.
Example 2
The embodiment 2 has the same characteristics as the embodiment 1, except that the gas extraction device 16 in the embodiment 2 is a vapor compressor, and the outlet of the vapor compressor can be connected with other heat utilization equipment; the condenser 14 is a tube condenser.
Step e: when the temperature of the hot liquid substance in the crystallization tank 10 is reduced to 15 ℃, the air exhaust device 16 is stopped, and the crystallization of the liquid substance in the crystallization tank 10 is finished.
The temperature of the hot liquid mass in step a was 65 ℃.
The liquid material in the crystallization tank 10 in step b is continuously boiled at a low pressure of 35kPa and the vapor is evaporated.
Example 3
Example 3 has substantially the same characteristics as example 1, except that in example 3
Step e: when the temperature of the hot liquid substance in the crystallization tank 10 is reduced to 25 ℃, the air exhaust device 16 is stopped, and the crystallization of the liquid substance in the crystallization tank 10 is finished.
The temperature of the hot liquid mass in step a was at 90 ℃.
The liquid material in the crystallization tank 10 in step b is continuously boiled at a low pressure of 70kPa and the vapor is evaporated.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.
Claims (5)
1. A method of crystallizing a liquid material, characterized by: the method comprises the following steps:
step a: hot liquid material is filled into the crystallization tank (10) through a feeding valve, when the liquid material reaches a set liquid level, the feeding valve and a discharging valve on the crystallization tank (10) are closed, and the crystallization tank (10) forms a sealed container;
step b: starting a circulating pump (11) to pump cold water in a water tank (13) into a condenser (14), conveying steam in a crystallization tank (10) into the condenser (14) through a second pipeline (17), installing a one-way valve (18) on the second pipeline (17), condensing the steam evaporated in the crystallization tank (10) by the condenser (14) and condensing the steam into liquid water, reducing the steam in the crystallization tank (10) to cause pressure reduction, and continuously boiling liquid substances in the crystallization tank (10) under low pressure to evaporate the steam;
step c: starting the cooling tower (12), conveying liquid water formed by the condenser (14) into the cooling tower (12) through a pipeline, and conveying the liquid water into the water tank (13) after the cooling tower (12) carries out cooling treatment on the liquid water;
step d: the temperature of hot liquid substances in the crystallization tank (10) is continuously reduced along with the lapse of time, when the temperature of the liquid substances in the crystallization tank (10) is close to the ambient temperature, the crystallization tank (10) is communicated with the condenser (14) through a first pipeline (15), an air extraction device (16) is installed on the first pipeline (15), the air extraction device (16) is started, the air extraction device (16) extracts steam in the crystallization tank (10) and conveys the steam to the condenser (14), the pressure in the crystallization tank (10) is continuously reduced, so that the liquid substances in the crystallization tank are continuously boiled and evaporate the steam, and the liquid substances in the crystallization tank (10) are continuously cooled and crystallized;
step e: when the temperature of the hot liquid substance in the crystallization tank (10) is reduced to 5-25 ℃, the air exhaust device (16) is stopped, and the crystallization of the liquid substance in the crystallization tank (10) is finished.
2. A method of crystallizing a liquid substance as defined in claim 1, wherein: the temperature of the hot liquid substance in the step a is 40-90 ℃.
3. A method of crystallizing a liquid substance as defined in claim 1, wherein: and c, continuously boiling the liquid substance in the crystallization tank (10) in the step b at a low pressure of 1-70 kPa and evaporating steam.
4. A method of crystallizing a liquid substance as defined in claim 1, wherein: the air extraction device (16) is a high-pressure fan or a vapor compressor.
5. A method of crystallizing a liquid substance as defined in claim 1, wherein: the condenser (14) is a hydraulic ejector or a tube condenser or a hybrid steam condenser.
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| CN201810802976.9A CN108786169B (en) | 2018-07-20 | 2018-07-20 | Crystallization system and method for liquid substance |
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| CN201810802976.9A CN108786169B (en) | 2018-07-20 | 2018-07-20 | Crystallization system and method for liquid substance |
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| CN108786169A CN108786169A (en) | 2018-11-13 |
| CN108786169B true CN108786169B (en) | 2020-11-27 |
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| CN112156494B (en) * | 2020-10-14 | 2022-05-17 | 天津大学 | Evaporative crystallization system suitable for substances with flaky crystal habit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2308576B1 (en) * | 2009-09-25 | 2015-11-04 | Stefan Ebner | Vaporiser |
| CN106492499A (en) * | 2016-11-11 | 2017-03-15 | 江苏乐科节能科技股份有限公司 | A kind of constant gradient decrease temperature crystalline system and its method of work |
| CN206746029U (en) * | 2017-03-28 | 2017-12-15 | 中盐江西兰太化工有限公司 | A kind of salt chemical engineering vacuum crystallization device |
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- 2018-07-20 CN CN201810802976.9A patent/CN108786169B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2308576B1 (en) * | 2009-09-25 | 2015-11-04 | Stefan Ebner | Vaporiser |
| CN106492499A (en) * | 2016-11-11 | 2017-03-15 | 江苏乐科节能科技股份有限公司 | A kind of constant gradient decrease temperature crystalline system and its method of work |
| CN206746029U (en) * | 2017-03-28 | 2017-12-15 | 中盐江西兰太化工有限公司 | A kind of salt chemical engineering vacuum crystallization device |
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