CN103073070A - Constant-speed cooling method of freezing crystallizer - Google Patents
Constant-speed cooling method of freezing crystallizer Download PDFInfo
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- CN103073070A CN103073070A CN2013100333397A CN201310033339A CN103073070A CN 103073070 A CN103073070 A CN 103073070A CN 2013100333397 A CN2013100333397 A CN 2013100333397A CN 201310033339 A CN201310033339 A CN 201310033339A CN 103073070 A CN103073070 A CN 103073070A
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Abstract
The invention discloses a constant-speed cooling method of a freezing crystallizer. The method comprises the steps that inflow water of a freezer is introduced from a constant-temperature water tank by a water pump; outflow water of a heat exchange tube of the freezing crystallizer enters a temperature adjustment water tank; inflow water of the heat exchange tube of the freezing crystallizer is introduced from the temperature adjustment water tank by a water pump; the outflow water and a part of frozen water of the heat exchange tube of the freezing crystallizer are mixed and subjected to temperature adjustment in the temperature adjustment water tank, and then serve as the inflow water of the heat exchange tube of the freezing crystallizer; redundant water after the temperature adjustment enters the constant-temperature water tank; and a temperature of a liquid in the freezing crystallizer is measured, so that a temperature difference between an inlet water temperature of the heat exchange tube of the freezing crystallizer and the temperature of the liquid in the freezing crystallizer reaches a set value. According to the method, the temperature adjustment water tank is adopted, and can adjust the temperature of the inflow water of the heat exchange tube of the freezing crystallizer to ensure that the temperature difference between the temperature of the inflow water and the temperature of the liquid in the freezing crystallizer is a constant value; and the heat transfer efficiency is constant under the condition that a water flow in the heat exchange tube is constant, so that the freezing crystallizer achieves constant speed cooling.
Description
Technical field
The invention belongs to iron and steel domain, be specifically related to a kind of cold method that adopts take copperas solution as raw material and produce the temperature-reduction at constant speed method of freezing and crystallizing device in the iron vitriol process.
Background technology
One of method for preparing the ferrous sulfate crystal take copperas solution as raw material is freeze crystallization, namely adopts freezing mode that the temperature in the solution is reduced, and ferrous sulfate is separated out with the form of crystal, separates obtaining the ferrous sulfate crystal by solid-liquid again.The major equipment of freeze crystallization is refrigerator and freezing and crystallizing device, for small-scale production, usually adopt the mode that spiral coil cooling tube directly is set in crystallizer to come solution is cooled off, the initial temperature of solution is 40 ~ 60 ℃, the outlet temperature of solution is cooled to 0 ~ 5 ℃, and the leaving water temperature(LWT) of the refrigerated water of employing is generally-10 ℃.Freezing initial stage refrigerated water and the crystallizer solution temperature difference are large, and heat exchange amount is large, and the solution cooling is fast, and therefore needed refrigerator refrigerating duty is large; Having a narrow range of temperature of freezing later stage refrigerated water and crystallizer solution, heat exchange amount is little, and the solution cooling is slow, and therefore required refrigerator refrigerating duty is little.Satisfy this kind operating mode, usually way has two kinds: a kind of be refrigerating duty with refrigerator according to the greatest requirements type selecting, freezing initial stage refrigerator oepration at full load, freezing later stage refrigerator load shedding operation, the method has caused the waste of capacity of equipment; A kind of is to set up freezing water tank between refrigerator and crystallizer, the freezing initial stage, united to the crystallizer cooling by freezing water tank and refrigerator when the refrigerator refrigerating duty is inadequate, carrying out along with refrigerating process, the freezing water tank water temperature raises, the freezing later stage, when the refrigerator refrigerating duty is superfluous, unnecessary cold is stored in use next time in the freezing water tank, the freezing water tank water temperature reduces, and the type selecting of refrigerator is comparatively economical in the method, but because the water temperature in the freezing water tank is changing value, therefore the operation condition of refrigerator is unstable, has affected the work-ing life of refrigerator.Above-mentioned two kinds of method freezing and crystallizing devices all are that leading portion cooling is fast, and the back segment cooling is slow, and speed of cooling inconsistent meeting in front and back causes the iron vitriol crystal grain that forms inhomogeneous, and product quality is not high.
Goal of the invention
Order of the present invention provides a kind of temperature-reduction at constant speed method of freezing and crystallizing device, can so that the crystal that forms is more even, guarantee simultaneously the constant operation of refrigerator so that the freezing and crystallizing device is at the uniform velocity lowered the temperature, and prolongs the work-ing life of refrigerator.
For realizing purpose of the present invention, the technical scheme that adopts is as follows: a kind of temperature-reduction at constant speed method of freezing and crystallizing device, described method uses refrigerator to produce water coolant, described method uses refrigerator to produce refrigerated water, make refrigerated water pass through the interior heat exchange pipeline of freezing and crystallizing device so that the fluid temperature in the crystallizer reduces,, it is characterized in that: described method has also been used temperature adjustment water tank and constant temperature water tank; The freezing water outlet of refrigerator enters temperature adjustment water tank and constant temperature water tank, and adopts valve that the flow that enters each water tank is regulated, and the water inlet of refrigerator arranges water pump and introduces from constant temperature water tank; The water outlet of freezing and crystallizing device heat exchange pipeline enters the temperature adjustment water tank, and the water inlet of freezing and crystallizing device heat exchange pipeline arranges water pump and introduces from the temperature adjustment water tank; As the water inlet of freezing and crystallizing device heat transfer tube, the water yield unnecessary after the temperature adjustment enters constant temperature water tank after temperature adjustment water tank mixing temperature adjustment for the heat transfer tube water outlet of freezing and crystallizing device and part refrigerated water; The refrigerator water outlet removes into temperature adjustment water tank part, and all the other refrigerated waters enter constant temperature water tank; Measure fluid temperature in the freezing and crystallizing device, heat exchange pipeline water-in and water-out temperature, when the fluid temperature difference is greater than set(ting)value in heat exchange pipeline water inlet water temperature and the freezing and crystallizing device, reduce and enter the temperature adjustment water tank refrigerated water water yield, so that mixed water temperature raises in the regulating tank, make itself and the interior fluid temperature difference of freezing and crystallizing device reach set(ting)value; When the fluid temperature difference was less than set(ting)value in heat exchange pipeline water inlet water temperature and the freezing and crystallizing device, increase entered the temperature adjustment water tank refrigerated water water yield, so that mixed water temperature reduces in the regulating tank, made itself and the interior fluid temperature difference of freezing and crystallizing device reach set(ting)value.
Wherein freezing and crystallizing device heat transfer tube temperature difference set(ting)value is 5 ~ 10 ℃.
Wherein pump capacity keeps constant.
Wherein refrigerator refrigerated water water inlet water temperature is-10 ℃, and output water temperature is-5 ℃.
Wherein the constant temperature water tank temperature is about-5 ℃, constant temperature water tank outer setting thermal insulation layer.
Be provided with the temperature adjustment water tank in present method, can regulate freezing and crystallizing device heat transfer tube water inlet water temperature, so that it is steady state value with the interior liquid temperature differential of freezing and crystallizing device, in the situation that discharge is constant in the heat transfer tube, guaranteed that heat transfer efficiency is constant, so that the freezing and crystallizing device has been realized temperature-reduction at constant speed.The required cold of freezing and crystallizing device is a steady state value simultaneously, when the refrigerating duty of refrigerator and freezing and crystallizing device institute chilling requirement coupling, the temperature adjustment water tank enters the cold that the heat that the water of constant temperature water tank brings and the refrigerated water that directly enters constant temperature water tank bring and just cancels out each other, water temperature in the constant temperature water tank can remain on about-5 ℃ always, the water inlet water temperature that has guaranteed refrigerator is constant, when the refrigerator flooding velocity is constant, refrigerator can constant operation under optimum condition, has prolonged the work-ing life of refrigerator.
Description of drawings
Fig. 1 is the schematic diagram of the invention process process.
Embodiment
The present invention will be further described in detail below in conjunction with accompanying drawing 1 and specific embodiment.
Embodiment, a kind of freezing and crystallizing device temperature-reduction at constant speed method is provided with refrigerator 1, freezing and crystallizing device 2, temperature adjustment water tank 3, constant temperature water tank 4, outer circulation pump 5, internal circulation pump 6, constant temperature water tank chilled water inlet valve 7, temperature adjustment water tank chilled water inlet valve 8, freezing and crystallizing device heat exchange pipeline 9.Advance at freezing and crystallizing device heat exchange pipeline 9/water outlet set temperature monitoring device, set temperature monitoring device in the freezing and crystallizing device arranges flow monitoring device at temperature adjustment water tank refrigerated water water inlet pipe.The refrigerator inflow temperature is set as-5 ℃, and water outlet temperature setting is-10 ℃, and the freezing and crystallizing device heat exchange pipeline Inlet and outlet water temperature difference is according to 5 ℃ of considerations.
After 50 ℃ copperas solutions enter in the freezing and crystallizing device 2, start refrigerator 1, internal recycle water pump 6, Open valve 7 and valve 8, so that the temperature in constant temperature water tank and the temperature adjustment water tank is down to about-5 ℃, starting outer circulation water pump 5 utilizes the refrigerated water in the temperature adjustment water tank 3 that the freezing and crystallizing device is cooled off, measuring heat transfer tube 9 in this process advances, output water temperature and freezing and crystallizing device 2 interior liquid water temperatures, when liquid temperature differential is greater than 18 ℃ in the water inlet of heat transfer tube 9 and the crystallizer in measuring crystallizer, increase valve 7 apertures, reduce valve 8 apertures, so that temperature adjustment water tank water temperature raises, when liquid temperature differential is less than 15 ℃ in the water inlet of heat transfer tube 9 and the crystallizer in measuring crystallizer, increase valve 8 apertures, reduce valve 7 apertures, so that temperature adjustment water tank water temperature reduces, remain that the fluid temperature difference is between 15 ~ 17 ℃ in the interior heat exchange pipeline 9 water inlet water temperatures of crystallizer and the crystallizer, after valve 7 is thoroughly closed, keep valve 8 standard-sized sheets operation for some time, until freezing and crystallizing device 2 temperature reach set(ting)value, whole refrigeration crystallization process finishes, close refrigerator 1, close water circulating pump 5 and water circulating pump 6, valve-off 8.
Claims (5)
1. the temperature-reduction at constant speed method of a freezing and crystallizing device, described method uses refrigerator to produce refrigerated water, make refrigerated water pass through the heat exchange pipeline in the freezing and crystallizing device so that the fluid temperature in the crystallizer reduces, it is characterized in that: described method has also been used temperature adjustment water tank and constant temperature water tank; The freezing water outlet of refrigerator enters temperature adjustment water tank and constant temperature water tank, and adopts valve that the flow that enters each water tank is regulated, and the water inlet of refrigerator arranges water pump and introduces from constant temperature water tank; The water outlet of freezing and crystallizing device heat exchange pipeline enters the temperature adjustment water tank, and the water inlet of freezing and crystallizing device heat exchange pipeline arranges water pump and introduces from the temperature adjustment water tank; As the water inlet of freezing and crystallizing device heat transfer tube, the water yield unnecessary after the temperature adjustment enters constant temperature water tank after temperature adjustment water tank mixing temperature adjustment for the heat transfer tube water outlet of freezing and crystallizing device and part refrigerated water; The freezing water outlet of refrigerator removes into temperature adjustment water tank part, and all the other refrigerated waters all enter constant temperature water tank; Measure fluid temperature in the freezing and crystallizing device, heat exchange pipeline water-in and water-out temperature, when the fluid temperature difference is greater than set(ting)value in heat exchange pipeline water inlet water temperature and the freezing and crystallizing device, reduce and enter the temperature adjustment water tank refrigerated water water yield, so that mixed water temperature raises in the regulating tank, make itself and the interior fluid temperature difference of freezing and crystallizing device reach set(ting)value; When the fluid temperature difference was less than set(ting)value in heat exchange pipeline water inlet water temperature and the freezing and crystallizing device, increase entered the temperature adjustment water tank refrigerated water water yield, so that mixed water temperature reduces in the regulating tank, made itself and the interior fluid temperature difference of freezing and crystallizing device reach set(ting)value.
2. the temperature-reduction at constant speed method of freezing and crystallizing device as claimed in claim 1, it is characterized in that: freezing and crystallizing device heat transfer tube temperature difference set(ting)value is 5 ~ 10 ℃.
3. the method for a kind of freezing and crystallizing device temperature-reduction at constant speed as claimed in claim 1, it is characterized in that: whole refrigerating process pump capacity keeps constant operation.
4. the temperature-reduction at constant speed method of freezing and crystallizing device as claimed in claim 1 is characterized in that: refrigerator refrigerated water water inlet water temperature is-10 ℃, and output water temperature is-5 ℃.
5. the temperature-reduction at constant speed method of freezing and crystallizing device as claimed in claim 1, it is characterized in that: the constant temperature water tank temperature is-5 ℃, constant temperature water tank outer setting thermal insulation layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310033339.7A CN103073070B (en) | 2013-01-29 | 2013-01-29 | Constant-speed cooling method of freezing crystallizer |
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| CN201310033339.7A CN103073070B (en) | 2013-01-29 | 2013-01-29 | Constant-speed cooling method of freezing crystallizer |
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| CN103073070A true CN103073070A (en) | 2013-05-01 |
| CN103073070B CN103073070B (en) | 2014-12-10 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003126607A (en) * | 2001-10-25 | 2003-05-07 | Mitsubishi Chemicals Corp | Operation method for crystallizer |
| CN200962071Y (en) * | 2006-10-26 | 2007-10-17 | 广东省吉荣空调设备公司 | Test device of efficient water temperature constant internal circular water cooling machine unit |
| CN201220270Y (en) * | 2008-06-17 | 2009-04-15 | 北京达博有色金属焊料有限责任公司 | Temperature constancy apparatus for casting cooling water of gold bonding wire |
| CN201565154U (en) * | 2009-11-21 | 2010-09-01 | 万福生科(湖南)农业开发股份有限公司 | Dextrose crystallization cooling device |
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- 2013-01-29 CN CN201310033339.7A patent/CN103073070B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003126607A (en) * | 2001-10-25 | 2003-05-07 | Mitsubishi Chemicals Corp | Operation method for crystallizer |
| CN200962071Y (en) * | 2006-10-26 | 2007-10-17 | 广东省吉荣空调设备公司 | Test device of efficient water temperature constant internal circular water cooling machine unit |
| CN201220270Y (en) * | 2008-06-17 | 2009-04-15 | 北京达博有色金属焊料有限责任公司 | Temperature constancy apparatus for casting cooling water of gold bonding wire |
| CN201565154U (en) * | 2009-11-21 | 2010-09-01 | 万福生科(湖南)农业开发股份有限公司 | Dextrose crystallization cooling device |
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| CN103073070B (en) | 2014-12-10 |
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