CN102424373B - Concentration apparatus for wet method phosphoric acid refinement - Google Patents

Concentration apparatus for wet method phosphoric acid refinement Download PDF

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CN102424373B
CN102424373B CN 201110423493 CN201110423493A CN102424373B CN 102424373 B CN102424373 B CN 102424373B CN 201110423493 CN201110423493 CN 201110423493 CN 201110423493 A CN201110423493 A CN 201110423493A CN 102424373 B CN102424373 B CN 102424373B
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flashing chamber
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steam
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吴杰
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吴杰
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Abstract

The invention relates to a concentration apparatus for wet method phosphoric acid refinement. The concentration apparatus comprises a flash evaporation chamber, a forced circulation pump, a heater, a concentration material liquid outlet pipe, a concentration material fluid inner pipe, a foam removing pipe, a cyclone separator and a steam pipe. A secondary steam outlet and a lower circulation pipe are respectively arranged on the upper end and the lower end of the flash evaporation chamber. An upper circulation pipe and the concentration material liquid outlet pipe are respectively arranged on the left side and the right side of the flash evaporation chamber. The height of the inner pipe opening on the concentration material fluid inner pipe is less than the height of the pipe opening of the upper circulation pipe. One end of an atmospheric pressure synchronization pipe is communicated with the concentration material liquid outlet pipe, and the other end of the atmospheric pressure synchronization pipe is communicated with the flash evaporation chamber or atmosphere. The foam removing pipe is connected with the secondary steam outlet. The other end of the secondary steam outlet is connected with the cyclone separator. The other end of the cyclone separator is connected with a condensate groove by a condenser. The steam pipe is arranged on a position close to the bottom of the flash evaporation chamber. With the design of the present invention, the flash evaporation effect is achieved, the siphon is prevented, it is ensured that the tiny droplet of the material liquid does not easily escape along with the secondary steam, such that the requirement of steam stripping defluoridation or steam stripping extractant recovery can be met so as to form a continuous production.

Description

A kind of concentrating unit for wet phosphoric acid refining
Technical field
The present invention relates to a kind of concentrating unit, relate in particular to a kind of concentrating unit for wet phosphoric acid refining, specifically be applicable to improve evaporation effect, prevent siphonic effect, foam removal and satisfy the stripping defluorinate or stripping reclaims the needs of extraction agent.
Background technology
At present, vaporizer is widely used in the fields such as chemical industry, pharmacy, food, generally comprises two kinds of natural-circulation evaporator and pump feed evaporators, and wherein, pump feed evaporator generally is used for dense thick or concentrated with the feed liquid of crystallization.
The Chinese patent Granted publication number is CN101391784B, Granted publication day is that the patent of invention on April 20th, 2011 discloses a kind of full forced circulation type evaporator, in this full forced circulation type evaporator, the internal structure of boiling-house is too complicated, a lot of baffle plates and traverse baffle have been added, be unfavorable for evaporation, hinder the realization of flash distillation effect, simultaneously, the discharge port height is substantially the same with opening for feed, not only can further reduce evaporation effect, hinder the realization of flash distillation effect, and easily cause and be concentrated the feed liquid short circuit and directly discharged.This shows, this kind full forced circulation type evaporator not only is difficult to realize the flash distillation effect, and can cause and be concentrated the feed liquid short circuit and directly discharged.
the Chinese patent patent No. is ZL93231051.6, Granted publication day is that the utility model patent on March 23rd, 1994 discloses a kind of standard forced cycling evaporator, this kind standard forced cycling evaporator has carried out second-heating, heat for the first time the loop exit at evaporator room, here heating can make recycle pump produce cavitation erosion, feed liquid after second-heating is distributed in evaporator room by distribution plate, to evenly evaporating feed liquid, hardly realize like this and can cause larger resistance, and due to the recycle feed mouth up, thereby the drop that produces when easily causing evaporating, it is the tiny liquid pearl of feed liquid, upwards go out evaporator room with secondary steam.This shows, this kind standard forced cycling evaporator not only can make recycle pump produce cavitation erosion, and can cause the tiny liquid pearl of feed liquid to be overflowed with secondary steam.
The Chinese patent publication No. is CN102008829A, date of publication is a kind of method that the patent of invention on April 13rd, 2011 discloses vacuum multi-effect forced circulation evaporation device and concentrated material thereof, this kind vacuum multi-effect forced circulation evaporation device attempts to utilize vacuum to realize the transfer of feed liquid, but because operation is too complicated, and need to form or vacuum breaker, cause to form serialization production.This shows, this kind vacuum multi-effect forced circulation evaporation device can't form serialization production.
Summary of the invention
The objective of the invention is to overcome being difficult to of existing in prior art realizes that flash distillation effect, the tiny liquid pearl of feed liquid easily overflow, can't form defective and problem that serialization is produced with secondary steam, provides a kind of and can realize that flash distillation effect, the tiny liquid pearl of feed liquid are difficult for overflowing, can form with secondary steam the concentrating unit that is used for wet phosphoric acid refining that serialization is produced.
for realizing above purpose, technical solution of the present invention is: a kind of concentrating unit for wet phosphoric acid refining, comprise flashing chamber, forced circulation pump and well heater, the two ends up and down of described flashing chamber are respectively arranged with secondary steam outlet and lower circulation tube, the left and right sides is respectively arranged with upper circular tube and concentrated feed liquid outlet pipe, the other end of concentrated feed liquid outlet pipe communicates with the concentrate feed liquid bath, the other end of described lower circulation tube is connected with forced circulation pump, the other end of forced circulation pump is connected with well heater, the other end of well heater is connected with upper circular tube, the upper circular tube mouth of pipe of the upper circular tube the other end is connected with flashing chamber, and the position of nearly forced circulation pump is provided with opening for feed on lower circulation tube,
Described concentrating unit also comprises the concentrated feed liquid inner tube that is arranged at flashing chamber inside, one end that should concentrate the feed liquid inner tube is connected with concentrated feed liquid outlet pipe, the other end is the inner spout after the downward-extension, and the nearly flashing chamber of inner spout bottom arranges, and the height of inner spout is lower than the upper circular tube mouth of pipe.
Described concentrated feed liquid inner tube is along the inwall setting of flashing chamber.
On described concentrated feed liquid outlet pipe, the position of nearly flashing chamber is provided with the air pressure lock-in tube, and the other end of this air pressure lock-in tube communicates with flashing chamber inside or atmosphere.
The other end of described air pressure lock-in tube is provided with the lock-in tube inner spout that communicates with flashing chamber inside, and the height of this lock-in tube inner spout is higher than the upper circular tube mouth of pipe.
Described concentrating unit also comprises the skimmer tube that is arranged at flashing chamber inside and the cyclonic separator that is arranged at the flashing chamber outside, skimmer tube is connected with the secondary steam outlet, the other end of secondary steam outlet is connected with cyclonic separator, the other end of cyclonic separator is connected with the condensation liquid bath through condenser, and is provided with on the condensation liquid bath and connects vacuum port.
Described skimmer tube comprises interconnective pipe section and conus portion, and conus portion is connected with the bottom of pipe section, and the top of pipe section is connected with the secondary steam outlet, and evenly is provided with a plurality of pipe taps on the tube wall of pipe section.
Described pipe tap be shaped as circle, ellipse, trilateral or Polygons.
Described concentrating unit also comprises the vapour pipe of nearly flashing chamber bottom setting, this vapour pipe comprises interconnective straight tube and endless tube, one end of straight tube is connected with the endless tube that is positioned at flashing chamber inside, and the other end extends to the outside of flashing chamber, and evenly is provided with a plurality of steam holes on endless tube.
Described steam hole be shaped as circle, ellipse, trilateral or Polygons.
Compared with prior art, beneficial effect of the present invention is:
1, a kind of concentrating unit for wet phosphoric acid refining of the present invention is provided with concentrated feed liquid inner tube in the inside of flashing chamber, one end that should concentrate the feed liquid inner tube is connected with concentrated feed liquid outlet pipe, the other end is the inner spout after the downward-extension, the nearly flashing chamber of inner spout bottom arranges, the height of inner spout is lower than the upper circular tube mouth of pipe, during use, one difference of altitude is arranged between the upper circular tube mouth of pipe and inner spout, this difference of altitude can be guaranteed to flow to from the upper circular tube mouth of pipe, just heating solution out can be arranged in the surface of flashing chamber liquid level, and the evaporation on liquid level surface is violent more than liquid level inside, thereby the evaporation effect that should design will be fine, general in solution arrives flashing chamber in the middle part of liquid level the time, solvent in solution evaporates substantially, the concentration of the concentrated feed liquid that flow out this moment just can evenly and reach requirement.Therefore the present invention can realize the flash distillation effect.
2, a kind of concentrating unit for wet phosphoric acid refining of the present invention is provided with the air pressure lock-in tube at the position that concentrates nearly flashing chamber on the feed liquid outlet pipe, the other end of this air pressure lock-in tube communicates with flashing chamber inside or atmosphere, when this application of installation during in negtive pressure forced circulating and evaporating system, the other end of air pressure lock-in tube communicates with flashing chamber inside; During in normal pressure forced circulation evaporation system, the other end of air pressure lock-in tube communicates with atmosphere when this application of installation; This air pressure lock-in tube can avoid concentrated feed liquid outlet pipe to produce siphonic effect to flashing chamber, prevents that namely concentrated feed liquid outlet pipe from aspirating away the feed liquid in flashing chamber, thereby guarantees normally carrying out of forced circulation evaporation.Therefore the present invention can effectively prevent the generation of siphonic effect.
3, a kind of concentrating unit for wet phosphoric acid refining of the present invention is respectively arranged with skimmer tube and cyclonic separator inside and outside flashing chamber, skimmer tube is connected with the secondary steam outlet, the other end of secondary steam outlet is connected with cyclonic separator, the other end of cyclonic separator is connected with the condensation liquid bath through condenser, and be provided with on the condensation liquid bath and connect vacuum port, during use, first by skimmer tube, the tiny liquid pearl of feed liquid of overflowing being collided with each other to become larger drop falls after rise in flashing chamber, avoid the tiny liquid pearl of feed liquid to overflow with secondary steam, this is the preliminary feed liquid foam of collecting, the cyclonic separator that exports, increases on pipeline between condenser by secondary steam is again collected the feed liquid foam again to reclaim the pump circulation system, and this is two steps to collect the feed liquid foam, by these two collection steps, can effectively avoid the tiny liquid pearl of feed liquid to overflow with secondary steam, avoid waste.Therefore the tiny liquid pearl of feed liquid in the present invention is difficult for overflowing with secondary steam.
4, a kind of concentrating unit for wet phosphoric acid refining of the present invention is provided with vapour pipe bottom nearly flashing chamber, this vapour pipe comprises interconnective straight tube and endless tube, one end of straight tube is connected with the endless tube that is positioned at flashing chamber inside, the other end extends to the outside of flashing chamber, and evenly be provided with a plurality of steam holes on endless tube, the purpose of this vapour pipe design is to pass into when needed steam, reclaims thereby satisfy the needs that solvent, evaporation concentration, stripping defluorinate or stripping reclaim extraction agent under wet phosphoric acid refining technique normal pressure or negative pressure.Therefore the present invention can satisfy the needs that reclaim solvent, evaporation concentration, stripping defluorinate or stripping recovery extraction agent under wet phosphoric acid refining technique normal pressure or negative pressure.
5, a kind of concentrating unit for wet phosphoric acid refining of the present invention can be realized the negtive pressure forced circulating and evaporating, can realize the normal pressure forced circulation evaporation again, and in wet phosphoric acid refining technique, usually need the consecutive evaporation operation of normal pressure, negative pressure, the present invention is without the change structure form, only need the adjusting operation parameter, just can tackle different evaporation demands, reclaim solvent as first carrying out normal pressure, after end, carry out again negative pressure concentrated, meet the job requirement of wet phosphoric acid refining technique fully, therefore can form serialization production.Therefore the present invention can adapt to normal pressure and negative pressure evaporation operation, and can realize continuous operation.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of flashing chamber in Fig. 1.
Fig. 3 is the structural representation of skimmer tube in Fig. 2.
Fig. 4 is the upward view of Fig. 2 middle steam tube.
Fig. 5 is the structural representation of embodiment 2 in the present invention.
in figure: flashing chamber 1, forced circulation pump 2, well heater 3, secondary steam outlet 4, lower circulation tube 5, opening for feed 51, upper circular tube 6, the upper circular tube mouth of pipe 61, concentrated feed liquid outlet pipe 7, concentrate feed liquid bath 71, concentrated feed liquid inner tube 8, inner spout 81, air pressure lock-in tube 9, lock-in tube inner spout 91, skimmer tube 10, pipe section 101, conus portion 102, pipe tap 103, cyclonic separator 11, condenser 12, condensation liquid bath 13, connect vacuum port 131, vapour pipe 14, straight tube 141, endless tube 142, steam hole 143.
Embodiment
The present invention is further detailed explanation below in conjunction with description of drawings and embodiment.
referring to figure 1 – Fig. 5, a kind of concentrating unit for wet phosphoric acid refining, comprise flashing chamber 1, forced circulation pump 2 and well heater 3, the two ends up and down of described flashing chamber 1 are respectively arranged with secondary steam outlet 4 and lower circulation tube 5, the left and right sides is respectively arranged with upper circular tube 6 and concentrated feed liquid outlet pipe 7, the other end of concentrated feed liquid outlet pipe 7 communicates with concentrate feed liquid bath 71, the other end of described lower circulation tube 5 is connected with forced circulation pump 2, the other end of forced circulation pump 2 is connected with well heater 3, the other end of well heater 3 is connected with upper circular tube 6, the upper circular tube mouth of pipe 61 of upper circular tube 6 the other ends is connected with flashing chamber 1, and the position of nearly forced circulation pump 2 is provided with opening for feed 51 on lower circulation tube 5,
Described concentrating unit also comprises the concentrated feed liquid inner tube 8 that is arranged at flashing chamber 1 inside, one end that should concentrate feed liquid inner tube 8 is connected with concentrated feed liquid outlet pipe 7, the other end is the inner spout 81 after the downward-extension, the nearly flashing chamber of inner spout 81 1 bottom arranges, and the height of inner spout 81 is lower than the upper circular tube mouth of pipe 61.
Described concentrated feed liquid inner tube 8 is along the inwall setting of flashing chamber 1.
On described concentrated feed liquid outlet pipe 7, the position of nearly flashing chamber 1 is provided with air pressure lock-in tube 9, and the other end of this air pressure lock-in tube 9 communicates with flashing chamber 1 inside or atmosphere.
The other end of described air pressure lock-in tube 9 is provided with the lock-in tube inner spout 91 that communicates with flashing chamber 1 inside, and the height of this lock-in tube inner spout 91 is higher than the upper circular tube mouth of pipe 61.
Described concentrating unit also comprises the skimmer tube 10 that is arranged at flashing chamber 1 inside and the cyclonic separator 11 that is arranged at flashing chamber 1 outside, skimmer tube 10 is connected with secondary steam outlet 4, the other end of secondary steam outlet 4 is connected with cyclonic separator 11, the other end of cyclonic separator 11 is connected with condensation liquid bath 13 through condenser 12, and is provided with on condensation liquid bath 13 and connects vacuum port 131.
Described skimmer tube 10 comprises interconnective pipe section 101 and conus portion 102, conus portion 102 is connected with the bottom of pipe section 101, the top of pipe section 101 and secondary steam outlet 4 is connected, and evenly is provided with a plurality of pipe taps 103 on the tube wall of pipe section 101.
Described pipe tap 103 be shaped as circle, ellipse, trilateral or Polygons.
Described concentrating unit also comprises the vapour pipe 14 of nearly flashing chamber 1 bottom setting, this vapour pipe 14 comprises interconnective straight tube 141 and endless tube 142, one end of straight tube 141 is connected with the endless tube 142 that is positioned at flashing chamber 1 inside, the other end extends to the outside of flashing chamber 1, and evenly is provided with a plurality of steam holes 143 on endless tube 142.
Described steam hole 143 be shaped as circle, ellipse, trilateral or Polygons.
Principle of the present invention is described as follows:
1, realize the flash distillation effect:
the present invention is provided with concentrated feed liquid inner tube 8 in the inside of flashing chamber 1, one end that should concentrate feed liquid inner tube 8 is connected with concentrated feed liquid outlet pipe 7, the other end is the inner spout 81 after the downward-extension, the nearly flashing chamber of inner spout 81 1 bottom arranges, the height of inner spout 81 is lower than the upper circular tube mouth of pipe 61, during use, there is difference of altitude between the upper circular tube mouth of pipe 61 and inner spout 81, this difference of altitude can make and flow to from the upper circular tube mouth of pipe 61, just heating solution out can be arranged in the surface of flashing chamber 1 liquid level (referring to the existing feed liquid of flashing chamber 1), rather than be positioned at the inside of liquid level, the evaporation on liquid level surface is violent more than liquid level inside after all, on the contrary, if the height of inner spout 81 is higher than the upper circular tube mouth of pipe 61, flow to from the upper circular tube mouth of pipe 61, just heating solution out will directly enter the inside of liquid level, the top that just flow to solution this moment will be covered by existing feed liquid, evaporation effect is naturally very poor.Therefore the design's evaporation effect is fine, and generally when just flowing to the interior liquid level of solution arrival flashing chamber 1 middle part, the solvent that has just flow in solution just evaporates substantially, and the concentration of the concentrated feed liquid that flow out this moment just can evenly and reach requirement.The design's core is the difference of altitude between the upper circular tube mouth of pipe 61 and inner spout 81, and this difference of altitude is the bigger the better.
2, prevent siphon:
In the present invention, the straight-through concentrate feed liquid bath 71 of the extension pipeline of concentrated feed liquid outlet pipe 7, far below the liquid level in flashing chamber 1, aspirate away the feed liquid in flashing chamber 1 with regard to easy generation siphonic effect like this, hinders normally carrying out of forced circulation evaporation.For addressing this problem, just must avoid the formation of siphonic effect, for this reason, the position of the present invention's nearly flashing chamber 1 on concentrated feed liquid outlet pipe 7 is provided with air pressure lock-in tube 9, the other end of this air pressure lock-in tube 9 communicates with flashing chamber 1 inside or atmosphere, particular case is: when this application of installation during in negtive pressure forced circulating and evaporating system, the other end of air pressure lock-in tube 9 communicates by the inside of lock-in tube inner spout 91 with flashing chamber 1, make concentrated feed liquid outlet pipe 7 identical with the air pressure of flashing chamber 1 inside, thereby avoid the formation of siphonic effect; When this application of installation during in normal pressure forced circulation evaporation system, the other end of air pressure lock-in tube 9 communicates with atmosphere, and flashing chamber 1 is worked under normal pressure, thereby this moment, concentrated feed liquid outlet pipe 7 was identical with the air pressure of flashing chamber 1 inside, be all normal pressure, thereby avoid the formation of siphonic effect.
3, the tiny liquid pearl of feed liquid is difficult for overflowing with secondary steam:
In the forced circulation evaporation process, feed liquid is mobile very fast, the evaporation of feed liquid is also more violent, the tiny liquid integument secondary steam that has unavoidably feed liquid during evaporation is carried secretly away, thereby cause waste, for preventing the generation of this situation, the present invention is respectively arranged with skimmer tube 10, cyclonic separator 11 to collect the tiny liquid pearl of feed liquid inside and outside flashing chamber 1.Wherein, skimmer tube 10 is connected with secondary steam outlet 4, the other end of secondary steam outlet 4 is connected with cyclonic separator 11, and the other end of cyclonic separator 11 is connected with condensation liquid bath 13 through condenser 12, and is provided with on condensation liquid bath 13 and connects vacuum port 131.Owing to evenly being provided with a plurality of pipe taps 103 on the tube wall of skimmer tube 10, thereby can allow evaporative air converge to the center, thereby can allow like this liquid foam as much as possible collide with each other to become larger drop to fall gets back in flashing chamber 1, the effect of conus portion 102 is exactly to collect these large drops, and this is the preliminary feed liquid foam of collecting; Again by secondary steam export 4, the cyclonic separator 11 that increases on pipeline between condenser 12 collects the feed liquid foam again to reclaim the pump circulation system, this is two steps to collect the feed liquid foam; By these two collection steps, can effectively avoid the tiny liquid pearl of feed liquid to overflow with secondary steam, avoid waste.The shape of pipe tap 103 is generally circle, ellipse, trilateral or Polygons, adjusts according to the intelligence-collecting object situation of reality.
4, satisfy stripping defluorinate or stripping and reclaim the extraction agent needs:
the present invention is provided with vapour pipe 14 at the position of nearly flashing chamber 1 bottom, this vapour pipe 14 comprises interconnective straight tube 141 and endless tube 142, one end of straight tube 141 is connected with the endless tube 142 that is positioned at flashing chamber 1 inside, the other end extends to the outside of flashing chamber 1, and evenly be provided with a plurality of steam holes 143 on endless tube 142, the purpose of these vapour pipe 14 designs is to pass into when needed steam, utilize steam to produce bubble in feed liquid, and these bubbles can impel solvent or fluorine in feed liquid to overflow with bubble, thereby satisfy under wet phosphoric acid refining technique normal pressure or negative pressure and reclaim solvent, evaporation concentration, stripping defluorinate or stripping reclaim the needs of extraction agent.The shape of steam hole 143 is generally circle, ellipse, trilateral or Polygons, adjusts according to actual needs.
5, can form serialization production:
In wet phosphoric acid refining technique, need to process various feed liquids by the mode that normal pressure reclaims solvent and negative pressure concentrated phosphoric acid.Such as, the solvent in extraction tail washings, wash water and strip liquor is reclaimed and need to carry out under normal pressure; To carrying out under negative pressure through the concentrated of strip liquor of reclaiming solvent; Both can adopt normal pressure also can adopt negative pressure when the vaporizing extract process defluorinate.This evaporation unit that just requires to be applied to wet phosphoric acid refining technique must can be realized the negtive pressure forced circulating and evaporating, can realize the normal pressure forced circulation evaporation again.The present invention can address that need fully, no matter be under normal pressure, or under negative pressure, without the change structure form, only need the adjusting operation parameter, that just can guarantee to evaporate carries out smoothly, can not only realize the flash distillation effect, prevent siphon, and can guarantee that the stripping defluorinate is not overflowed, can be satisfied to the tiny liquid pearl of feed liquid with secondary steam or stripping reclaims the extraction agent needs, thereby form serialization production.Thereby the present invention can adapt to normal pressure and negative pressure evaporation operates, can realize continuous operation, satisfies the requirement of wet phosphoric acid refining technique fully.
Embodiment 1, the pump circulation under negative pressure condition:
Referring to Fig. 1, the vacuum port 131 that connects on condensation liquid bath 13 is connected with vacuum system and opens vacuum system, need concentrated feed liquid to enter the forced circulation evaporation system by opening for feed 51, send into well heater 3 heating through forced circulation pump 2, enter flashing chamber 1 after being heated to certain temperature, feed liquid through heating discharges secondary steam in flashing chamber 1, secondary steam after the preliminary collection liquid of skimmer tube 10 foam, cyclonic separator 11 secondary foam removals, is condensed into phlegma and flows into phlegma groove 13 successively in condenser 12.Remove fluorine, chlorine as need, open vapour pipe 14 to the logical steam of the feed liquid in flashing chamber 1, can impel the effusion of fluorine, chlorine.
Feed liquid is after pervaporation, the feed liquid that reaches desired concn is because the suction of forced circulation pump 2 flows downward, and major part flows back to again forced circulation pump 2 and again circulates, and small part overflows flashing chamber 1 through concentrated feed liquid outlet pipe 7, enter concentrate feed liquid bath 71, complete concentrated.Be provided with the lock-in tube inner spout 91 that communicates with flashing chamber 1 inside on air pressure lock-in tube 9 due to air pressure lock-in tube 9(this moment, and the height of lock-in tube inner spout 91 is higher than liquid level and the upper circular tube mouth of pipe 61) effect, feed liquid in flashing chamber 1 can not be pumped because of siphonic effect, thereby has stablized the liquid level in flashing chamber 1.
Embodiment 2, the pump circulation in the normal pressure situation:
Referring to Fig. 5, need concentrated feed liquid to enter the forced circulation evaporation system by opening for feed 51, send into well heater 3 heating through forced circulation pump 2, enter flashing chamber 1 after being heated to certain temperature, feed liquid through heating discharges secondary steam in flashing chamber 1, secondary steam after the preliminary collection liquid of skimmer tube 10 foam, cyclonic separator 11 secondary foam removals, is condensed into phlegma and flows into phlegma groove 13 successively in condenser 12.Remove fluorine, chlorine or reclaim extraction agent as need, opening vapour pipe 14 to the logical steam of the feed liquid in flashing chamber 1, can impel the effusion of fluorine, chlorine and extraction agent.
Feed liquid is after pervaporation, the feed liquid that reaches desired concn is because the suction of forced circulation pump 2 flows downward, and major part flows back to again forced circulation pump 2 and again circulates, and small part overflows flashing chamber 1 through concentrated feed liquid outlet pipe 7, enter concentrate feed liquid bath 71, complete concentrated.Due to air pressure lock-in tube 9(this moment air pressure lock-in tube 9 communicate with atmosphere) effect, the feed liquid in flashing chamber 1 can not be pumped because of siphonic effect, thereby has stablized the interior liquid level of flashing chamber 1.
The above is only better embodiment of the present invention; protection scope of the present invention is not limited with above-mentioned embodiment; as long as the equivalence that those of ordinary skills do according to disclosed content is modified or changed, all should include in the protection domain of putting down in writing in claims.

Claims (7)

1. concentrating unit that is used for wet phosphoric acid refining, comprise flashing chamber (1), forced circulation pump (2) and well heater (3), the two ends up and down of described flashing chamber (1) are respectively arranged with secondary steam outlet (4) and lower circulation tube (5), the left and right sides is respectively arranged with upper circular tube (6) and concentrated feed liquid outlet pipe (7), the other end of concentrated feed liquid outlet pipe (7) communicates with concentrate feed liquid bath (71), the other end of described lower circulation tube (5) is connected with forced circulation pump (2), the other end of forced circulation pump (2) is connected with well heater (3), the other end of well heater (3) is connected with upper circular tube (6), the upper circular tube mouth of pipe (61) of upper circular tube (6) the other end is connected with flashing chamber (1), and the position at the upper nearly forced circulation pump (2) of lower circulation tube (5) is provided with opening for feed (51), it is characterized in that:
Described concentrating unit also comprises the concentrated feed liquid inner tube (8) that is arranged at flashing chamber (1) inside, one end that should concentrate feed liquid inner tube (8) is connected with concentrated feed liquid outlet pipe (7), the other end is the inner spout (81) after the downward-extension, the bottom of the nearly flashing chamber (1) of inner spout (81) arranges, and the height of inner spout (81) is lower than the upper circular tube mouth of pipe (61);
The position of the upper nearly flashing chamber (1) of described concentrated feed liquid outlet pipe (7) is provided with air pressure lock-in tube (9), and the other end of this air pressure lock-in tube (9) communicates with flashing chamber (1) inside or atmosphere;
Described concentrating unit also comprises the cyclonic separator (11) that is arranged at the inner skimmer tube (10) of flashing chamber (1) and is arranged at flashing chamber (1) outside, skimmer tube (10) is connected with secondary steam outlet (4), the other end of secondary steam outlet (4) is connected with cyclonic separator (11), the other end of cyclonic separator (11) is connected with condensation liquid bath (13) through condenser (12), and is provided with on condensation liquid bath (13) and connects vacuum port (131).
2. a kind of concentrating unit for wet phosphoric acid refining according to claim 1, it is characterized in that: described concentrated feed liquid inner tube (8) is along the inwall setting of flashing chamber (1).
3. a kind of concentrating unit for wet phosphoric acid refining according to claim 1 and 2, it is characterized in that: the other end of described air pressure lock-in tube (9) is provided with the lock-in tube inner spout (91) that communicates with flashing chamber (1) inside, and the height of this lock-in tube inner spout (91) is higher than the upper circular tube mouth of pipe (61).
4. a kind of concentrating unit for wet phosphoric acid refining according to claim 1 and 2, it is characterized in that: described skimmer tube (10) comprises interconnective pipe section (101) and conus portion (102), conus portion (102) is connected with the bottom of pipe section (101), the top of pipe section (101) is connected with secondary steam outlet (4), and evenly is provided with a plurality of pipe taps (103) on the tube wall of pipe section (101).
5. a kind of concentrating unit for wet phosphoric acid refining according to claim 4 is characterized in that: described pipe tap (103) be shaped as circle, ellipse or Polygons.
6. a kind of concentrating unit for wet phosphoric acid refining according to claim 1 and 2, it is characterized in that: described concentrating unit also comprises the vapour pipe (14) of nearly flashing chamber (1) bottom setting, this vapour pipe (14) comprises interconnective straight tube (141) and endless tube (142), one end of straight tube (141) endless tube (142) inner with being positioned at flashing chamber (1) is connected, the other end extends to the outside of flashing chamber (1), and evenly is provided with a plurality of steam holes (143) on endless tube (142).
7. a kind of concentrating unit for wet phosphoric acid refining according to claim 6 is characterized in that: described steam hole (143) be shaped as circle, ellipse or Polygons.
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CN102863267B (en) * 2012-09-08 2014-03-26 湖北三宁化工股份有限公司 Method for producing monoammonium phosphate and coproducing N-P binary compound fertilizer by using wet-process phosphoric acid
CN103523763B (en) * 2013-10-11 2017-04-05 徐州天正活性炭厂 A kind of energy saver and method of rapid concentration of dilute phosphoric acid
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