CN102942195A - Method for improving production capacity of crystallizer for co-production of ammonium chloride and soda ash - Google Patents
Method for improving production capacity of crystallizer for co-production of ammonium chloride and soda ash Download PDFInfo
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- CN102942195A CN102942195A CN2012104847713A CN201210484771A CN102942195A CN 102942195 A CN102942195 A CN 102942195A CN 2012104847713 A CN2012104847713 A CN 2012104847713A CN 201210484771 A CN201210484771 A CN 201210484771A CN 102942195 A CN102942195 A CN 102942195A
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Abstract
The invention discloses a method for improving the production capacity of a crystallizer for co-production of ammonium chloride and soda ash. The method includes sending hot mother liquor for absorbing ammonia to an external cooler for heat exchange with cooling water, sending the liquor to a cold separation crystallizer through a cold mother liquor feeding pump, whipping cold mother liquor through an axial flow pump to the external cooler for heat exchange with liquid ammonia, returning the cold mother liquor to the cold separation crystallizer after heat exchange, taking out crystal mush from the middle of the cold separation crystallizer and sending the mush to a mixing thickener, then subjecting the mush to centrifugation by a centrifuge, overflowing from the cold separation crystallizer to a salting out crystallizer which using common-ion effect to further precipitate ammonium chloride crystallization through adding salt, and taking out the crystallization from the middle of the salting out crystallizer and sending to a salting out thickener. According to the method, the production capacity of the crystallizer is improved through technological means such as strengthening operation of the external cooler, prolonging effective cleaning time of the external cooler and the like, the investment is saved, the volume increasing effect is remarkable, and the production capacity of a single crystallizer can be improved by more than 40%.
Description
Technical field
The present invention relates to join the alkali production technical field, refer to particularly a kind of method that improves connection alkali crystallizer throughput.
Background technology
In connection alkali was produced, the crystallisation process of ammonium chloride was divided into cold crystallization and two steps of salting-out crystallization, was finished in cool crystallizer and salting-out crystallizer respectively by the effect of cooling and salt adding by ammonia mother liquor I.The cold crystallization technique of ammonium chloride is divided into outer cold crystallization flow process and vacuum crystallization flow process by refrigeration method, and the whole of present domestic employing are outer cold crystallization flow processs.
Tap the potential and upgrade technologically on the existing installation basis, the approach that improves cool crystallizer throughput has two.Article one, approach is to improve the heat transfer efficiency of Outer Cooler by technological transformation, the method that adopts has: 1. the Outer Cooler tubulation is used corrosion resistant titanium material tubulation instead: by prolonging the tubulation life-span, reducing the thermal resistance increase that scabs and cause because of corrosion, reach the purpose of enhancement of heat transfer, raising throughput; 2. the parts such as existing axial-flow pump impeller are transformed or directly changed the propeller pump of large flow low-lift, by increasing the flow velocity of half II in the Outer Cooler, reach the purpose of enhancement of heat transfer, raising throughput.The second approach is Optimizing operation rules, standard operation behavior, and what make every Outer Cooler is in optimum condition all the time, and the method for employing has: the working cycle that 1. shortens Outer Cooler; 2. strengthen the cleaning of Outer Cooler; 3. strengthen the operation of Outer Cooler.Article one, the advantage of approach is that to improve the effect of crystallizer throughput more remarkable, but the technological transformation Meteorological is higher; The second approach mainly is strictly to operate by rules, do not increase input, but effect of increasing production is not remarkable.Summary of the invention
The purpose of this invention is to provide a kind of method that improves connection alkali crystallizer throughput, with Effective Raise connection alkali crystallizer throughput.
Technical scheme of the present invention: a kind of method that improves connection alkali crystallizer throughput, may further comprise the steps: the hot mother liquor of self-priming ammonia send Outer Cooler and water coolant heat exchange in the future first, feed intake with cold mother liquor and to be pumped to cool crystallizer, beat cold mother liquor by propeller pump and go Outer Cooler and liquefied ammonia heat exchange, cold mother liquor after the heat exchange returns cool crystallizer, taking out magma by cool crystallizer middle part send to convert and closes that to enter whizzer behind the thickener centrifugal again, the cool crystallizer overflow precipitation and crystallization device that desalts, salting-out crystallizer utilizes common-ion effcet by salt adding, further separate out ammonium chloride crystals, taken out by the salting-out crystallizer middle part and send the thickener of saltouing.
As preferred version, liquefied ammonia was back to Outer Cooler after hot mother liquor entered the ammonia liquor separator separation through Outer Cooler gained gas ammonia.
As preferred version, salting-out crystallizer overflows back the cold mother liquor bucket, is pumped to mother with cold mother liquor and changes and the mother liquor heat exchange, and the mother liquor backheat mother vat after the heat exchange removes to inhale ammonia with the hot mother liquor pumping.
The invention has the advantages that: by strengthening the Outer Cooler operation, the technique means such as effective scavenging period that prolong Outer Cooler reach the purpose that improves crystallizer throughput.Reduced investment of the present invention, obvious effect of increasing production, the present invention can make the throughput of separate unit crystallizer improve more than 40%.
Description of drawings
Fig. 1 is connection alkali crystallization workshop section process flow diagram.
Embodiment:
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
A kind of method that improves connection alkali crystallizer throughput, may further comprise the steps: the hot mother liquor of self-priming ammonia send Outer Cooler and water coolant heat exchange in the future first, feed intake with cold mother liquor and to be pumped to cool crystallizer, beat cold mother liquor by propeller pump and go Outer Cooler and liquefied ammonia heat exchange, cold mother liquor after the heat exchange returns cool crystallizer, taking out magma by cool crystallizer middle part send to convert and closes that to enter whizzer behind the thickener centrifugal again, the cool crystallizer overflow precipitation and crystallization device that desalts, salting-out crystallizer utilizes common-ion effcet by salt adding, further separate out ammonium chloride crystals, taken out by the salting-out crystallizer middle part and send the thickener of saltouing.Liquefied ammonia was back to Outer Cooler after hot mother liquor entered the ammonia liquor separator separation through Outer Cooler gained gas ammonia.Salting-out crystallizer overflows back the cold mother liquor bucket, is pumped to mother with cold mother liquor and changes and the mother liquor heat exchange, and the mother liquor backheat mother vat after the heat exchange removes to inhale ammonia with the hot mother liquor pumping.
The throughput of original crystal system design is 140,000 ton/years, and this system disposition has a cool crystallizer, and the present invention makes the heat interchanging area of Recycling Mother Solution amount and Outer Cooler increase by 50%; The cleaning strength of Outer Cooler is strengthened, the emptying caliber of Outer Cooler is increased to DN150 by DN100, shortened the emptying time of material in the Outer Cooler, thereby prolonged effective scavenging period of Outer Cooler, the total cleaning of separate unit Outer Cooler shortened to 2.5～3 hours by original 8 hours.
After implementing the present invention, crystal system AI throwing amount is by 230m
3/ h is increased to 300m
3About/h, the crystallizer activity duration is pressed 8400h/a, and the mother liquor equivalent is pressed 10t/m
3Meter, the crystallizer yearly capacity increases: (300-230) ÷ 10 * 8400 ÷ 10000=5.88 ten thousand ton/years, and the throughput of crystallizer has improved 42%.
Claims (3)
1. one kind is improved the method that joins alkali crystallizer throughput, may further comprise the steps: the hot mother liquor of self-priming ammonia send Outer Cooler and water coolant heat exchange in the future first, feed intake with cold mother liquor and to be pumped to cool crystallizer, beat cold mother liquor by propeller pump and go Outer Cooler and liquefied ammonia heat exchange, cold mother liquor after the heat exchange returns cool crystallizer, taking out magma by cool crystallizer middle part send to convert and closes that to enter whizzer behind the thickener centrifugal again, the cool crystallizer overflow precipitation and crystallization device that desalts, salting-out crystallizer utilizes common-ion effcet by salt adding, further separate out ammonium chloride crystals, taken out by the salting-out crystallizer middle part and send the thickener of saltouing.
2. a kind of method that improves connection alkali crystallizer throughput according to claim 1 is characterized in that: liquefied ammonia was back to Outer Cooler after described hot mother liquor entered ammonia liquor separator and separates through Outer Cooler gained gas ammonia.
3. a kind of method that improves connection alkali crystallizer throughput according to claim 1, it is characterized in that: described salting-out crystallizer overflows back the cold mother liquor bucket, be pumped to mother with cold mother liquor and change and the mother liquor heat exchange, the mother liquor backheat mother vat after the heat exchange removes to inhale ammonia with the hot mother liquor pumping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104847713A CN102942195A (en) | 2012-11-23 | 2012-11-23 | Method for improving production capacity of crystallizer for co-production of ammonium chloride and soda ash |
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| CN2012104847713A CN102942195A (en) | 2012-11-23 | 2012-11-23 | Method for improving production capacity of crystallizer for co-production of ammonium chloride and soda ash |
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| CN102942195A true CN102942195A (en) | 2013-02-27 |
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| CN2012104847713A Pending CN102942195A (en) | 2012-11-23 | 2012-11-23 | Method for improving production capacity of crystallizer for co-production of ammonium chloride and soda ash |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107585778A (en) * | 2017-10-15 | 2018-01-16 | 赵祥海 | Salting-out crystallizer outer loop cool-down method in procedure of producing soda under joint alkaline process |
| CN108147434A (en) * | 2017-12-07 | 2018-06-12 | 新奥泛能网络科技股份有限公司 | Join alkali system |
| CN108584990A (en) * | 2018-06-09 | 2018-09-28 | 连云港市擎天德邦科技发展有限公司 | Crystal external condensation device circulator and method in procedure of producing soda under joint alkaline process |
| CN110921685A (en) * | 2019-11-26 | 2020-03-27 | 连云港市福源德邦科技发展有限公司 | Crystallization reverse material flow device and method in combined-soda-process soda ash production process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59184728A (en) * | 1983-04-01 | 1984-10-20 | Asahi Glass Co Ltd | Precipitating method of ammonium chloride |
| RU2174954C1 (en) * | 2000-04-24 | 2001-10-20 | Общество с ограниченной ответственностью "Эковита" | Method of processing sulfite-bisulfite solutions |
| JP2004182656A (en) * | 2002-12-04 | 2004-07-02 | Showa Kako Kk | Method for producing high-purity aldehyde compound |
| CN102502716A (en) * | 2011-11-10 | 2012-06-20 | 赵祥海 | Technology for cooling ammonia mother liquor I in crystallizing working section during combined soda producing process |
-
2012
- 2012-11-23 CN CN2012104847713A patent/CN102942195A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59184728A (en) * | 1983-04-01 | 1984-10-20 | Asahi Glass Co Ltd | Precipitating method of ammonium chloride |
| RU2174954C1 (en) * | 2000-04-24 | 2001-10-20 | Общество с ограниченной ответственностью "Эковита" | Method of processing sulfite-bisulfite solutions |
| JP2004182656A (en) * | 2002-12-04 | 2004-07-02 | Showa Kako Kk | Method for producing high-purity aldehyde compound |
| CN102502716A (en) * | 2011-11-10 | 2012-06-20 | 赵祥海 | Technology for cooling ammonia mother liquor I in crystallizing working section during combined soda producing process |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107585778A (en) * | 2017-10-15 | 2018-01-16 | 赵祥海 | Salting-out crystallizer outer loop cool-down method in procedure of producing soda under joint alkaline process |
| CN108147434A (en) * | 2017-12-07 | 2018-06-12 | 新奥泛能网络科技股份有限公司 | Join alkali system |
| CN108147434B (en) * | 2017-12-07 | 2019-11-15 | 新奥泛能网络科技股份有限公司 | Join alkali system |
| CN108584990A (en) * | 2018-06-09 | 2018-09-28 | 连云港市擎天德邦科技发展有限公司 | Crystal external condensation device circulator and method in procedure of producing soda under joint alkaline process |
| CN110921685A (en) * | 2019-11-26 | 2020-03-27 | 连云港市福源德邦科技发展有限公司 | Crystallization reverse material flow device and method in combined-soda-process soda ash production process |
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Application publication date: 20130227 |