CN102774981A - Membrane process denitrification process of light salt brine and denitrification device - Google Patents
Membrane process denitrification process of light salt brine and denitrification device Download PDFInfo
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Abstract
The invention discloses a membrane process denitrification process of light salt brine and a denitrification device. The membrane process denitrification process of the light salt brine comprises the steps of: dechlorinated light salt brine is respectively added with sodium sulfite before entering into a water storage tank and after flowing out of the water storage tank; the dechlorinated light salt brine after being added with sodium sulfite is subjected to heat exchange and cooling through a first-level titanium plate exchange, a second-level titanium plate exchange and a third-level titanium plate exchange; the cooled dechlorinated light salt brine is subjected to primary membrane process denitrification; lean nitrate solution and rich nitrate solution are obtained, and denitrification of the dechlorinated light salt brine is finished. By the mode, afterheat can be fully recovered, energy consumption can be reduced, and a membrane is ensured to safely operate at the same time.
Description
Technical field
The present invention relates to the chlor-alkali field, particularly relate to a kind of light salt brine embrane method denitrating technique and device thereof.
Background technology
Light salt brine embrane method denitrating technique mainly is the sulfate radical of removing in the salt solution, because the enrichment of sulfate radical influences the work-ing life of film easily.In alkali-making process, the major cause of bringing into of sulfate radical has two, one, raw materials for production sulfur-bearing acid group; The 2nd, when using chemical dechlorination after the saline electrolysis, need to add the reductive agent S-WAT, thereby produce sulfate radical.
In the existing light salt brine embrane method denitrating technique; Have following defective: when single-stage added S-WAT and regulates PH, S-WAT can not be stablized control, can only excessively add; Cause the dosing waste and increase muriatic generation; Film caused to life damage, excessive add the sulfate radical that sodium sulfate can be added to film, increase system's operating load and running cost.The pH value confidence level of the light salt brine of single-stage adjusting simultaneously is not high.
In temperature-fall period, existing light salt brine embrane method denitrating technique adopts the secondary cooling, makes waste heat recovery not thorough easily, causes the part heat waste, consumes circulation in a large number.
In the embrane method denitrification process, existing light salt brine embrane method denitrating technique adopts the secondary denitration, can cause energy consumption to rise like this, and trouble spot and maintenance cost are high.
Summary of the invention
The technical problem that the present invention mainly solves provides a kind of light salt brine embrane method denitrating technique and device thereof, and fully recovery waste heat reduces energy consumption, guarantees the safe operation of film simultaneously.
For solving the problems of the technologies described above, the present invention provides a kind of light salt brine embrane method denitrating technique, comprising: before the dechlorination light salt brine gets into aqua storage tank and after flowing out aqua storage tank, add S-WAT respectively; To add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively; Dechlorination light salt brine after the cooling is carried out the denitration of one-level embrane method, obtain poor nitre liquid and rich nitre liquid, accomplish the denitration of dechlorination light salt brine.
Wherein, above-mentioned before the dechlorination light salt brine gets into aqua storage tank and after flowing out aqua storage tank, the step that adds S-WAT respectively comprises: before the dechlorination light salt brine got into aqua storage tank, the pH value of first coarse adjustment dechlorination light salt brine slightly added S-WAT then; And after the dechlorination light salt brine flows out aqua storage tank, the pH value of first accurate adjustment dechlorination light salt brine, finishing S-WAT then.
Wherein, above-mentioned to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change the step of carrying out the heat exchange cooling successively and comprise: one-level titanium plate changes and adopts the low-temperature receiver refined brine to carry out the heat exchange cooling; Secondary titanium plate changes and adopts the poor nitre liquid of low-temperature receiver to carry out the heat exchange cooling; And three grades of titanium plates change and adopt low-temperature receiver recirculated water to carry out the heat exchange cooling.
Wherein, the dechlorination light salt brine behind above-mentioned will the cooling carries out the denitration of one-level embrane method, and the step that obtains poor nitre liquid and rich nitre liquid comprises afterwards: poor being used to of nitre liquid salt operation, rich nitre liquid is used for the decrease temperature crystalline operation.
Wherein, the step that above-mentioned rich nitre liquid is used for the decrease temperature crystalline operation comprises: rich nitre liquid at first gets into mold, and its come-up clear liquid flows into the mother liquor water cooler then, lowers the temperature through the mother liquor water cooler; After come-up clear liquid after the cooling of mother liquor water cooler carried out hybrid cooling with the rich nitre liquid that flows into mold, mold carried out crystallization to it, obtains magma liquid, and wherein, crystallized product is a sal glauberi.
Wherein, After come-up clear liquid after the above-mentioned mother liquor water cooler cooling carries out hybrid cooling with the rich nitre liquid that flows into mold,, mold carries out crystallization to it; The step that obtains magma liquid comprises afterwards: magma liquid is carried out solid-liquid separation; Produce sal glauberi and clear liquid, wherein, sal glauberi can be used as the finished product saltcake and uses.
For solving the problems of the technologies described above, the present invention also provides a kind of light salt brine embrane method denitrification apparatus, comprising: the dosing module, be used for before the dechlorination light salt brine gets into aqua storage tank with flow out aqua storage tank after, add S-WAT respectively; Cooling module, be used for to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively; The denitration module is used for the dechlorination light salt brine after the cooling is carried out denitration through one-level embrane method denitrating system, obtains poor nitre liquid and rich nitre liquid, accomplishes the denitration of dechlorination light salt brine.
Wherein, the dosing module specifically is used for before the dechlorination light salt brine gets into aqua storage tank, and the pH value of first coarse adjustment dechlorination light salt brine slightly adds S-WAT then; And after the dechlorination light salt brine flows out aqua storage tank, the pH value of first accurate adjustment dechlorination light salt brine, finishing S-WAT then.
Wherein, cooling module to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively, be specially one-level titanium plate and change and adopt the low-temperature receiver refined brine to carry out the heat exchange cooling; Secondary titanium plate changes and adopts the poor nitre liquid of low-temperature receiver to carry out the heat exchange cooling; Three grades of titanium plates change and adopt cooling circulating water to carry out the heat exchange cooling.
Wherein, denitrification apparatus comprises: the decrease temperature crystalline module, be used for after the denitration module is carried out denitration to the dechlorination light salt brine, and the rich nitre liquid that obtains is carried out decrease temperature crystalline.
Wherein, the decrease temperature crystalline module comprises: the mother liquor water cooler is used for the come-up clear liquid of the rich nitre liquid that flows into through mold is lowered the temperature; Mold, after being used for come-up clear liquid after mother liquor water cooler cooling and flowing into mold once more with mold in rich nitre liquid mix after, it is carried out crystallization, obtain magma liquid, wherein, crystallized product is a sal glauberi.
Wherein, denitrification apparatus comprises: the solid-liquid separation module, be used for the magma liquid that mold produces is carried out solid-liquid separation, and produce sal glauberi and clear liquid, wherein, sal glauberi can be used as the finished product saltcake and uses.
The invention has the beneficial effects as follows: light salt brine embrane method denitrating technique of the present invention is specially at first before the dechlorination light salt brine gets into aqua storage tank and after flowing out aqua storage tank; Add S-WAT respectively, add S-WAT through secondary and avoid in the prior art owing to add not enough or the excessive and infringement that film is caused of S-WAT.Then to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively, guarantees the abundant recovery of waste heat.Dechlorination light salt brine after will lowering the temperature at last carries out denitration through one-level embrane method denitrating system, obtains poor nitre liquid and rich nitre liquid, accomplishes the denitration of dechlorination light salt brine.By the way, the present invention is recovery waste heat fully, reduces energy consumption, guarantees the safe operation of film simultaneously.
Description of drawings
Fig. 1 is the schematic flow sheet of light salt brine embrane method denitrating technique one embodiment of the present invention;
Fig. 2 is the schematic flow sheet of another embodiment of light salt brine embrane method denitrating technique of the present invention;
Fig. 3 is the structural representation of light salt brine embrane method denitrification apparatus one embodiment of the present invention;
Fig. 4 is the structural representation of another embodiment of light salt brine embrane method denitrification apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
Fig. 1 is the schematic flow sheet of light salt brine embrane method denitrating technique one embodiment of the present invention, and is as shown in the figure, may further comprise the steps:
Step 101 before the dechlorination light salt brine gets into aqua storage tank and after flowing out aqua storage tank, adds S-WAT respectively;
Add acting as of S-WAT and remove the chlorine that exists in the dechlorination light salt brine, thereby avoid the damage of chlorine film.In light salt brine embrane method denitrating technique, add S-WAT and be referred to as dosing.The prerequisite that stable control adds dose is to guarantee that the discharge of dechlorination light salt brine and pH value fluctuate relatively steady.The concrete dosing method of present embodiment is following:
A. one-level adds S-WAT
Before the dechlorination light salt brine gets into aqua storage tank; Its PH of coarse adjustment at first; Regulate reagent such as Hydrogen chloride etc.,, therefore pH value is controlled at (weakly alkaline) between the 8-9 because S-WAT reaction effect under alkaline condition is better; After mixer mixing, slightly add S-WAT again, the amount that adds S-WAT is bigger slightly than the MV that dechlorination light salt brine contains free chlorine.Get into aqua storage tank through pipeline then.
B. secondary adds S-WAT
On the aqua storage tank rising pipe, the pH value of accurate adjustment dechlorination light salt brine is specially mode and PH instrument signal interlocking with pH value.And then the finishing S-WAT, bring the damage that the part chlorine residue causes film when avoiding adding hydrochloric acid into, the mode of concrete finishing is interlocked with the ORP instrument signal, plays double protection.
Present embodiment is guaranteed the safe, stable of film through secondary dosing method and rational dosing position.
After secondary added S-WAT, the dechlorination light salt brine flow to topping-up pump.
Step 102, to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively;
To the effusive dechlorination light salt brine of topping-up pump, temperature is than higher, and the processing of need lowering the temperature in the present embodiment, is carried out three grades of coolings, guaranteeing the abundant recovery of waste heat, and reduces the consumption of recirculated water.Be specially at first one-level titanium plate and change and adopt the low-temperature receiver refined brine to carry out the heat exchange cooling, secondary titanium plate changes and adopts the poor nitre liquid of low-temperature receiver to carry out the heat exchange cooling then, and last three grades of titanium plates change and adopt the low-temperature receiver cooling circulating water to carry out the heat exchange cooling.The temperature of guaranteeing the dechlorination light salt brine is about 35 ℃.
Wherein, for the maximization of increasing the benefit, the low-temperature receiver refined brine that one-level titanium plate changes is the salt solution in the system alkali operation.The poor nitre liquid of the low-temperature receiver that secondary titanium plate changes is the poor nitre liquid that produces in the light salt brine embrane method denitrating technique.
Dechlorination light salt brine through after three grades of coolings further dechlorinates through activated charcoal filter, flows to dashpot then, again to HPP.
Step 103 is carried out the denitration of one-level embrane method with the dechlorination light salt brine after the cooling, obtains poor nitre liquid and rich nitre liquid, accomplishes the denitration of dechlorination light salt brine.
After the pre-treatment in early stage of dechlorination light salt brine through step 101 and step 102; Carry out the denitration of one-level embrane method; Because film hole diameter is just between a divalent ion, and has negative charge, therefore vitriol had the high ability that removes; And sodium-chlor is had the ability that well sees through, and operating safety, flexibly reach simple to operate.
Wherein, the rich nitre liquid of process one-level embrane method denitration contains the nitre amount and reaches 85g/l, reduces energy consumption simultaneously.
Wherein, the rich nitre liquid of part can flow into dashpot, to guarantee the stable of dashpot.
Wherein, through poor being used to of the nitre liquid salt operation of one-level embrane method denitration, rich nitre liquid is used for the decrease temperature crystalline operation.
The decrease temperature crystalline of rich nitre liquid mainly is with the sulfate radical crystallization, so that separate, detailed process is following:
Before rich nitre flow is gone into mold, carry out pH value earlier and regulate, the rich nitre liquid that will flow into mold then pumps into the mother liquor water cooler through rich nitre pump with its come-up clear liquid, and the come-up clear liquid is lowered the temperature.Be specially through cold rinse bank, water supply pump and handpiece Water Chilling Units the cooling that circulates of mother liquor water cooler.
Come-up clear liquid after the cooling flows into mold by the mother liquor water cooler again, and after rich nitre liquid in the mold mixed, mold carried out crystallization to it, obtains magma liquid, and wherein, crystallized product is a sal glauberi.
The magma pump is gone into whizzer with the magma liquid pump that obtains, and carries out solid-liquid separation through whizzer, produces sal glauberi and clear liquid, and wherein, sal glauberi can be used as the finished product saltcake and uses.Clear liquid flows into mold, Crystallization Separation again once more through separating clear liquid groove and clear liquid pump.
Wherein, the mother liquor water cooler need utilize flushed channel and flushing pump that it is washed, and the liquid part after the flushing flows into the mother liquor water cooler; Another part flows into aqua storage tank, to guarantee the stability of aqua storage tank.
Wherein, in the embodiment shown in fig. 1, also can prolong the obstruction cycle that the titanium plate changes, optimize the structure of mold simultaneously.
The concrete optimal way of mold is that all pan feedings advance from the top, and increase guide shell, prolong rich nitre liquid and grow up the time with cooling post crystallization clear liquid mixing time and crystal seed.Enter material way also can reduce the discharging pressure head of mother liquor water cooler from the top simultaneously, prolongs the mother liquor water cooler and stops up the cycle.
Also can optimize crystallizing field collection bucket structure, improve and gather materials and discharge efficient.
Fig. 2 is the schematic flow sheet of another embodiment of light salt brine embrane method denitrating technique of the present invention, and is as shown in the figure, may further comprise the steps:
The described content of step 201-205 all has detailed description in the embodiment shown in fig. 1, repeats no more at this.
Fig. 3 is the structural representation of light salt brine embrane method denitrification apparatus one embodiment of the present invention, and is as shown in the figure, comprising: dosing module 301, cooling module 302, denitration module 303, decrease temperature crystalline module 304 and solid-liquid separation module 305.
Wherein, dosing module 301 is used for before the dechlorination light salt brine gets into aqua storage tank and after flowing out aqua storage tank, adds S-WAT respectively; Cooling module 302 be used for to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively; Denitration module 303 is used for the dechlorination light salt brine after the cooling is carried out denitration through one-level embrane method denitrating system, obtains poor nitre liquid and rich nitre liquid, accomplishes the denitration of dechlorination light salt brine; Decrease temperature crystalline module 304 is used for after 303 pairs of dechlorination light salt brines of denitration module carry out denitration, and the rich nitre liquid that obtains is carried out decrease temperature crystalline; Solid-liquid separation module 305 is used for the magma liquid that decrease temperature crystalline module 304 produces is carried out solid-liquid separation, produces sal glauberi and clear liquid, and wherein, sal glauberi can be used as the finished product saltcake and uses.
Wherein, dosing module 301 specifically is used for before the dechlorination light salt brine gets into aqua storage tank, and the pH value of first coarse adjustment dechlorination light salt brine slightly adds S-WAT then; And after the dechlorination light salt brine flows out aqua storage tank, the pH value of first accurate adjustment dechlorination light salt brine, finishing S-WAT then.
302 pairs of cooling modules add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively, be specially one-level titanium plate and change and adopt the low-temperature receiver refined brine to carry out the heat exchange cooling; Secondary titanium plate changes and adopts the poor nitre liquid of low-temperature receiver to carry out the heat exchange cooling; Three grades of titanium plates change and adopt low-temperature receiver recirculated water to carry out the heat exchange cooling.
Fig. 4 is the structural representation of another embodiment of light salt brine embrane method denitrification apparatus of the present invention, and is as shown in the figure, comprising: dosing module 301, cooling module 302, denitration module 303, decrease temperature crystalline module 304 and solid-liquid separation module 305.
Denitrification apparatus also comprises: mixing tank 306, aqua storage tank 307, topping-up pump 308, activated charcoal filter 309, dashpot 310, HPP 311, separation clear liquid groove 312, clear liquid pump 313 and wash module 314.
Wherein, cooling module 302 comprises that one-level titanium plate changes 3021, secondary titanium plate changes 3022 and three grades of titanium plates and changes 3023.Decrease temperature crystalline module 304 comprises mold 3041, mother liquor water cooler 3042, rich nitre pump 3043, handpiece Water Chilling Units 3044, water supply pump 3045, cold rinse bank 3046 and magma pump 3047.Wash module 314 comprises flushed channel 3141 and flushing pump 3142.
Wherein, solid-liquid separation module 305 can be whizzer or other equipment for separating liquid from solid.
Concrete mode of connection of above-mentioned each device does, before the dechlorination light salt brine gets into aqua storage tank 307, and its pH value of first coarse adjustment; After mixing tank 306 mixes; Add S-WAT through dosing module 301, get into aqua storage tank 307 through pipeline then, on the rising pipe of aqua storage tank 307; The pH value of elder generation's accurate adjustment dechlorination light salt brine, and then through dosing module 301 adding S-WATs.
The dechlorination light salt brine that adds S-WAT is pumped into cooling module 302 through topping-up pump 308 lowers the temperature, be specially successively through one-level titanium plate change 3021, secondary titanium plate changes 3022 and three grades of titanium plates and changes 3023 and lower the temperature.Dechlorination light salt brine after the cooling further dechlorinates through activated charcoal filter 309, flows to dashpot 310 then, again to HPP 311.
The dechlorination light salt brine that 303 pairs of HPPs 311 of denitrification apparatus pump into carries out denitration, produces poor nitre liquid and rich nitre liquid.Poor being used to of nitre liquid salt operation, rich nitre liquid is used for the decrease temperature crystalline operation.Wherein, the rich nitre liquid of part can flow into dashpot 310, to guarantee the stable of dashpot 310.
Rich nitre liquid carries out crystallization through decrease temperature crystalline module 304; Be specially before rich nitre flow is gone into mold 3041; Carry out pH value earlier and regulate, the come-up clear liquid that will flow into the rich nitre liquid of mold 3041 then pumps into mother liquor water cooler 3042 through rich nitre pump 3043, and it is lowered the temperature.Be specially through the cooling that circulates of cold rinse bank 3046, water supply pump 3045 and 3044 pairs of mother liquor water coolers 3042 of handpiece Water Chilling Units.Come-up clear liquid after the cooling flows into mold 3041 by mother liquor water cooler 3042 again, and after mold 3041 interior rich nitre liquid mixed, mold 3041 carried out crystallization to it, obtains magma liquid, and wherein, crystallized product is a sal glauberi.
Wherein, mother liquor water cooler 3042 need utilize flushed channel 3141 and flushing pump 3142 that it is washed, and the liquid part after the flushing flows into mother liquor water cooler 3042; Another part flows into aqua storage tank 307, to guarantee the stability of aqua storage tank 307.
Light salt brine embrane method denitrating technique of the present invention is specially at first before the dechlorination light salt brine gets into aqua storage tank and after flowing out aqua storage tank; Add S-WAT respectively, add S-WAT through secondary and avoid in the prior art owing to add very few or the excessive and infringement that film is caused of S-WAT.Then to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively, guarantees the abundant recovery of waste heat.Dechlorination light salt brine after will lowering the temperature at last carries out denitration through one-level embrane method denitrating system, obtains poor nitre liquid and rich nitre liquid, accomplishes the denitration of dechlorination light salt brine.By the way, the present invention is recovery waste heat fully, reduces energy consumption, guarantees the safe operation of film simultaneously.
The above is merely embodiments of the invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification sheets of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. light salt brine embrane method denitrating technique is characterized in that: comprising:
Before the dechlorination light salt brine gets into aqua storage tank and after flowing out aqua storage tank, add S-WAT respectively;
To add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively;
Dechlorination light salt brine after the cooling is carried out the denitration of one-level embrane method, obtain poor nitre liquid and rich nitre liquid, accomplish the denitration of dechlorination light salt brine.
2. denitrating technique according to claim 1 is characterized in that:
Above-mentioned before the dechlorination light salt brine gets into aqua storage tank and after flowing out aqua storage tank, the step that adds S-WAT respectively comprises:
Before the dechlorination light salt brine got into aqua storage tank, the pH value of the said dechlorination light salt brine of first coarse adjustment slightly added S-WAT then; And
After the dechlorination light salt brine flows out aqua storage tank, the pH value of the said dechlorination light salt brine of first accurate adjustment, finishing S-WAT then.
3. denitrating technique according to claim 1 is characterized in that:
Above-mentioned to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change the step of carrying out the heat exchange cooling successively and comprise:
One-level titanium plate changes and adopts the low-temperature receiver refined brine to carry out the heat exchange cooling;
Secondary titanium plate changes and adopts the poor nitre liquid of low-temperature receiver to carry out the heat exchange cooling; And
Three grades of titanium plates change and adopt low-temperature receiver recirculated water to carry out the heat exchange cooling.
4. denitrating technique according to claim 1 is characterized in that:
Dechlorination light salt brine behind above-mentioned will the cooling carries out the denitration of one-level embrane method, and the step that obtains poor nitre liquid and rich nitre liquid comprises afterwards:
Said poor being used to of nitre liquid salt operation, rich nitre liquid is used for the decrease temperature crystalline operation.
5. denitrating technique according to claim 4 is characterized in that:
The step that above-mentioned rich nitre liquid is used for the decrease temperature crystalline operation comprises:
Rich nitre liquid at first gets into mold, and its come-up clear liquid flows into the mother liquor water cooler then, lowers the temperature through the mother liquor water cooler;
After come-up clear liquid after the said mother liquor water cooler cooling carried out hybrid cooling with the rich nitre liquid that flows into mold, mold carried out crystallization to it, obtains magma liquid, and wherein, crystallized product is a sal glauberi;
After come-up clear liquid after the above-mentioned mother liquor water cooler cooling carried out hybrid cooling with the rich nitre liquid that flows into mold, mold carried out crystallization to it, and the step that obtains magma liquid comprises afterwards:
Said magma liquid is carried out solid-liquid separation, produce sal glauberi and clear liquid, wherein, said sal glauberi can be used as the finished product saltcake and uses.
6. light salt brine embrane method denitrification apparatus is characterized in that: comprising:
The dosing module, be used for before the dechlorination light salt brine gets into aqua storage tank with flow out aqua storage tank after, add S-WAT respectively;
Cooling module, be used for to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively;
The denitration module is used for the dechlorination light salt brine after the cooling is carried out denitration through one-level embrane method denitrating system, obtains poor nitre liquid and rich nitre liquid, accomplishes the denitration of dechlorination light salt brine.
7. denitrification apparatus according to claim 6 is characterized in that:
Said dosing module specifically is used for before the dechlorination light salt brine gets into aqua storage tank, and the pH value of the said dechlorination light salt brine of first coarse adjustment slightly adds S-WAT then; And
After the dechlorination light salt brine flows out aqua storage tank, the pH value of the said dechlorination light salt brine of first accurate adjustment, finishing S-WAT then.
8. denitrification apparatus according to claim 6 is characterized in that:
Said cooling module to add behind the S-WAT the dechlorination light salt brine through one-level titanium plate change, secondary titanium plate changes and three grades of titanium plates change and carry out the heat exchange cooling successively, be specially one-level titanium plate and change and adopt the low-temperature receiver refined brine to carry out the heat exchange cooling; Secondary titanium plate changes and adopts the poor nitre liquid of low-temperature receiver to carry out the heat exchange cooling; Three grades of titanium plates change and adopt low-temperature receiver recirculated water to carry out the heat exchange cooling.
9. denitrification apparatus according to claim 6 is characterized in that:
Said denitrification apparatus comprises:
The decrease temperature crystalline module is used for after said denitration module is carried out denitration to the dechlorination light salt brine, and the rich nitre liquid that obtains is carried out decrease temperature crystalline;
Wherein, said decrease temperature crystalline module comprises:
The mother liquor water cooler is used for the come-up clear liquid of the rich nitre liquid that flows into through mold is lowered the temperature;
Mold, after being used for come-up clear liquid after the cooling of said mother liquor water cooler and flowing into mold once more with said mold in rich nitre liquid mix after, it is carried out crystallization, obtain magma liquid, wherein, crystallized product is a sal glauberi.
10. denitrification apparatus according to claim 9 is characterized in that:
Said denitrification apparatus comprises:
The solid-liquid separation module is used for the magma liquid that said mold produces is carried out solid-liquid separation, produces sal glauberi and clear liquid, and wherein, said sal glauberi can be used as the finished product saltcake and uses.
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