CN105174291B - A kind of device and method for slowing down sal prunella coproduction nitre flash evaporation tank fouling - Google Patents
A kind of device and method for slowing down sal prunella coproduction nitre flash evaporation tank fouling Download PDFInfo
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- CN105174291B CN105174291B CN201510481663.4A CN201510481663A CN105174291B CN 105174291 B CN105174291 B CN 105174291B CN 201510481663 A CN201510481663 A CN 201510481663A CN 105174291 B CN105174291 B CN 105174291B
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Abstract
This practicality provides a kind of device and method for slowing down sal prunella coproduction nitre flash evaporation tank fouling, it includes cyclic part, wherein cyclic part includes circulating pump, preheater, nitre evaporator, nitre flash evaporation tank and the salt evaporator being sequentially connected, the solid salt slurry of the salt evaporator outflow leads to salt slurry bucket, the liquid of outflow is connected with the entrance of circulating pump, the outlet of the salt slurry bucket is provided with brine pump, and salt slurry is delivered to collect after centrifuge by brine pump by salt slurry pump discharge pipe obtains salt, it is characterised in that：The salt slurry pump discharge pipe is communicated provided with one section of backflow branch pipe with nitre flash evaporation tank, and the backflow branch pipe is provided with flow control valve.The present invention slows down the generation of salt crust, extends duty cycle, with very strong practicality beneficial to the precipitation growth of crystallization in nitre flash evaporation tank and shwoot operation.
Description
Technical field
The present invention relates to joint production process of salt and salt-cake technical field, specifically refer to a kind of slow down sal prunella coproduction nitre flash evaporation tank fouling
Device and method.
Background technology
Sal prunella coproduction is a kind of main method of current production salt, is to produce salt and nothing using sodium sulfate type hydromining halogen
Water nitre.Usually introduce the old halogen joint production process of salt and salt-cake of Sulzer company of Switzerland.But the technique is faced with nitre flash evaporation tank always
The problem of fouling is serious.It is general after sal prunella combined production device is driven 15 days or so, because nucleation is small during flash evaporation, solid-liquid
It is bigger than small, circulating mother liquor amount, therefore easily cause the tank skin of nitre flash evaporation tank and turn expects pipe and start salt scale coagulation, and be grown into, lead
Cause shwoot area to reduce, turn material difficult.And as the production cycle extends, fouling is serious all the more, results even in production cycle
Interrupt.
In order to solve the above problems, prior art is usually to take pumping fresh water to enter tank to solve in the way of dissolving salt crust,
Processing 2-3 times, enters tank fresh water amount about 50m every time daily3.Then nitre flash evaporation tank is emptied at 15 days or so, then it is " false with fresh water
Brush ".A large amount of fresh water, which enter system, will cause the reduction of nitre system component, and sal prunella solid-to-liquid ratio back dissolving has a strong impact on yield and steam
Consumption.
The content of the invention
The purpose of the present invention is according to a kind of above-mentioned not enough equipment for slowing down sal prunella coproduction nitre flash evaporation tank fouling of offer and side
Method, this method can promote crystallization in nitre flash evaporation tank, slow down the generation of salt crust.
To achieve the above object, technical solution of the present invention is as follows：A kind of equipment for slowing down sal prunella coproduction nitre flash evaporation tank fouling,
It includes cyclic part, and wherein cyclic part includes circulating pump, preheater, nitre evaporator, nitre flash evaporation tank and the salt being sequentially connected
Evaporator, the solid salt slurry of the salt evaporator outflow leads to salt slurry bucket, and the liquid of outflow is connected with the entrance of circulating pump, described
The outlet of salt slurry bucket is provided with brine pump, and salt slurry is delivered to collect after centrifuge by brine pump by salt slurry pump discharge pipe obtains salt,
It is characterized in that：The salt slurry pump discharge pipe is communicated provided with one section of backflow branch pipe with nitre flash evaporation tank, is set on the backflow branch pipe
There is flow control valve.
Slow down sal prunella coproduction nitre flash evaporation tank fouling it is a further object to provide a kind of utilization the said equipment
Method, it is characterised in that：The folding degree of flow control valve, makes part salt slurry be flowed into by the branch pipe that flows back on control backflow branch pipe
In nitre flash evaporation tank.
It is preferred that, the solid-to-liquid ratio in the nitre flash evaporation tank is 3-5%.
It is an advantage of the invention that：Solid-to-liquid ratio is less than 2%, nucleus quantity mistake in existing joint production process of salt and salt-cake nitre flash evaporation tank
Few, degree of supersaturation is too high in nitre flash evaporation tank, a large amount of primary nucleus that shwoot is produced, and is attached to surface not bery bright and clean chamber wall
On, therefore it is blocking to form salt crust.And the present invention makes nucleus moderate number by providing salt slurry nucleus in addition.Nitre is controlled simultaneously
Solid-to-liquid ratio degree of supersaturation in 3-5%, nitre flash evaporation tank is also moderate in flash evaporation tank, beneficial to crystallized in nitre flash evaporation tank precipitation growth and
Shwoot is operated, and slows down the generation of salt crust, extends duty cycle.The present invention is simple in construction, and effect is notable, with very strong practicality
Property.
Brief description of the drawings
Fig. 1 is sal prunella coproduction cyclic part schematic diagram of the invention；
Wherein, 1- circulating pumps, 2- one-levels preheater, bis- grades of preheaters of 3-, 4- nitre evaporator, 5- one-level nitre flash evaporation tank, 6-
Two grades of nitre flash evaporation tanks, 7- salt evaporator, 8- salt slurry bucket, 9- brine pumps, 10- salt slurries pump discharge pipe, 11- centrifuges, 12- backflow branch
Pipe, 13- flow control valves.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments：
As shown in figure 1, sal prunella coproduction is to be increased using solubility of the NaCl in water with the rise of temperature, Na2SO4
NaCl (i.e. salt) and Na in the principle that solubility in water reduces with the rise of temperature, separation raw brine2SO4(i.e.
Nitre).Specific cyclic part as shown in figure 1, by feed liquid by circulating pump 1 flow through one-level preheater 2 and two grades of preheaters 3 plus
Heat, makes the Na in feed liquid2SO4Solubility diminishes, NaCl solubility increase.Then feed liquid, which enters in nitre evaporator 4, evaporates water
Point, make Na2SO4Separate out, NaCl concentration increase.Then the higher feed liquid of NaCl concentration is passed sequentially through into the He of one-level nitre flash evaporation tank 5
Two grades of nitre flash evaporation tanks 6, flowed into after cooling evaporation in salt evaporator 7, make Na2SO4Solubility increase, and NaCl is then gradually
Separate out.Liquid portion in salt evaporator 7 leads to circulating pump 1, and NaCl and Na are isolated again by cyclic part2SO4.And salt
Solid portion in evaporator 7 leads to salt slurry bucket 8.The exit of salt slurry bucket 8 is provided with brine pump 9, and brine pump 9 is pumped out by salt slurry
Salt slurry is delivered to collect after centrifuge 11 by mouth pipe 10 obtains salt.The salt slurry pump discharge pipe 10 is provided with one section of backflow branch pipe 12
Communicated with one-level nitre flash evaporation tank 5, the backflow branch pipe 12 is provided with flow control valve 13.By controlling opening for flow control valve 13
Conjunction degree, makes part salt slurry as plus seed and flows into one-level nitre flash evaporation tank 5 by the branch pipe 12 that flows back.And by controlling one-level
Solid-to-liquid ratio in nitre flash evaporation tank 5 is 3-5%, promotes the crystal structure growth in one-level nitre flash evaporation tank 5.Slow down nitre flash evaporation tank inner salt
The speed that dirt is produced, extends duty cycle from 15 days to 60 days.And additional fresh water, or frequently brush tank etc. are not needed, save into
This.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (1)
1. a kind of equipment for slowing down sal prunella coproduction nitre flash evaporation tank fouling, it includes cyclic part, and wherein cyclic part is included successively
Connected circulating pump, preheater, nitre evaporator, nitre flash evaporation tank and salt evaporator, the solid salt slurry of the salt evaporator outflow is led to
Toward salt slurry bucket, the liquid of outflow is connected with the entrance of circulating pump, and the outlet of the salt slurry bucket is provided with brine pump, and brine pump passes through salt
Salt slurry is delivered to collect after centrifuge by stock pump outlet obtains salt, it is characterised in that：The salt slurry pump discharge pipe is provided with one
Duan Huiliu branch pipes are communicated with nitre flash evaporation tank, and the backflow branch pipe is provided with flow control valve；Flow control on control backflow branch pipe
The folding degree of valve, makes part salt slurry be flowed into by the branch pipe that flows back in nitre flash evaporation tank；Solid-to-liquid ratio in the nitre flash evaporation tank is 3-
5%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481663.4A CN105174291B (en) | 2015-08-03 | 2015-08-03 | A kind of device and method for slowing down sal prunella coproduction nitre flash evaporation tank fouling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481663.4A CN105174291B (en) | 2015-08-03 | 2015-08-03 | A kind of device and method for slowing down sal prunella coproduction nitre flash evaporation tank fouling |
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| Publication Number | Publication Date |
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| CN105174291A CN105174291A (en) | 2015-12-23 |
| CN105174291B true CN105174291B (en) | 2017-09-26 |
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| CN108726540B (en) * | 2017-04-18 | 2021-05-07 | 神华集团有限责任公司 | Salt production method and salt production system |
| CN110065956A (en) * | 2019-05-17 | 2019-07-30 | 湖南省湘衡盐化有限责任公司 | A kind of salt producing craft and its system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1368481A (en) * | 2001-02-09 | 2002-09-11 | 南京东方化工有限公司 | Process for treating waste saponifying alkali solution by chemical method |
| CN101624194B (en) * | 2008-07-11 | 2015-01-28 | 中国轻工业长沙工程有限公司 | Production method for co-production of mirabilite and salt and production device thereof |
| CN202193627U (en) * | 2011-10-20 | 2012-04-18 | 中盐金坛盐化有限责任公司 | Salt and glauber salt co-production device for preparing high-purity salt |
| CN103332705B (en) * | 2013-06-28 | 2015-09-16 | 湖南省湘衡盐化有限责任公司 | Sodium sulphate type bittern sextuple-effect evaporation produces the device of sal prunella |
| CN204233787U (en) * | 2014-11-05 | 2015-04-01 | 中盐东兴盐化股份有限公司 | A kind of device controlling salt flash evaporation tank degree of supersaturation |
| CN204342449U (en) * | 2014-11-24 | 2015-05-20 | 中盐新干盐化有限公司 | The sal prunella combination preparing device of 302 flash evaporation tank production cycles of a kind of prolongation |
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