CN214456874U - Triple-effect evaporation device for waste liquid in iron phosphate production process - Google Patents

Abstract

The utility model relates to a triple effect evaporation plant of ferric phosphate production process waste liquid, including one imitate the heat exchanger, one imitates the separator, two imitate the heat exchanger, two imitate the separator, three imitate the heat exchanger, three imitate separator and crystallization buffer tank, be equipped with one in each heat exchanger respectively and imitate the pre-heater, two imitate pre-heater and three imitate the pre-heater, be equipped with one in each separator and imitate the distributing pipe respectively, two imitate distributing pipe and three imitate distributing pipe, each separator lower part is back taper and the equipartition has the vibrator, it is equipped with the (mixing) shaft to rotate in the crystallization buffer tank, the equipartition has a plurality of cavitys in the (mixing) shaft, be equipped with the biax motor in the cavity, two output shafts of biax motor all stretch out the (mixing) shaft and linked firmly the puddler, the (mixing) shaft bottom equipartition has a plurality of cross-strut poles, the upper and lower both sides of cross-strut tail end are all articulated to be equipped with the rotary rod. The utility model discloses can carry out tertiary preheating to the material, can make the material distribute more evenly and effectively avoid the crystallization material to pile up the jam, can be to the crystallization material stirring complete that gets into the buffer tank, efficiency is higher.

Description

Triple-effect evaporation device for waste liquid in iron phosphate production process

Technical Field

The utility model belongs to the technical field of the iron phosphate production, concretely relates to triple effect evaporation plant of iron phosphate production process waste liquid.

Background

The iron phosphate, namely ferric phosphate and ferric orthophosphate, is white and off-white monoclinic crystal powder, is salt generated by the action of ferric salt solution and sodium phosphate, and is mainly used for manufacturing lithium iron phosphate battery materials, catalysts, ceramics and the like.

The common iron phosphate production process is that firstly, an aqueous solution containing sulfuric acid and organic acid is reacted with iron powder to prepare a ferrous sulfate aqueous solution; then, feeding the ferrous sulfate aqueous solution into a reaction kettle, dropwise adding a mixed solution composed of ammonium persulfate, ammonium phosphate and the like into the reaction kettle, adding phosphoric acid, controlling the pH value to be below 3, stirring and mixing at a certain temperature, and reacting; and demagnetizing, filtering, filter-pressing, rinsing, and spray-drying the reacted mixture to obtain the iron phosphate product. Wherein, the waste liquid pressed and filtered in the filter pressing procedure can be recycled after extraction and concentration, and the common concentration equipment is a triple-effect multistage evaporator. However, the existing triple-effect multi-stage evaporator still has the following problems in actual use: 1. materials directly enter the one-effect heat exchanger to start heating and evaporation, and the phenomena of material wall hanging and coke tube are easily generated due to sudden temperature rise, so that the efficiency and quality of integral evaporation and concentration are influenced; 2. the material is not uniformly distributed after entering the separator, which is not beneficial to rapid crystallization and separation, and the crystallized material is easy to accumulate or harden at the lower cone position of the separator, so that the discharge pipe of the separator is blocked, the whole evaporation system can not work normally, and the efficiency and quality of evaporation and concentration are further influenced; 3. the crystallization material that obtains after triple effect evaporation concentration usually need carry earlier to carry out buffering pressure regulating and homogenization in the crystallization buffer tank, makes the material more even to operation such as subsequent centrifugal separation, but conventional buffer tank adopts present anchor frame formula agitator more, has stirring effect poor, inefficiency, stirs not enough even complete scheduling problem, awaits improving.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a triple effect evaporation plant of iron phosphate production process waste liquid can carry out tertiary preheating to the material earlier before an effect heat transfer, and the distribution is more even and effectively avoids the crystallization material to pile up the jam when can making the material get into each separator, can stir more evenly complete to the crystallization material that gets into the buffer tank, and efficiency is higher to solve above-mentioned problem.

In order to achieve the above object, the utility model adopts the following technical scheme: a three-effect evaporation device for waste liquid in the iron phosphate production process comprises a material tank, a feeding pump, a one-effect heat exchanger, a one-effect separator, a one-effect circulating pump, a two-effect heat exchanger, a two-effect separator, a two-effect circulating pump, a three-effect heat exchanger, a three-effect separator, a three-effect circulating pump and a crystallization buffer tank, a first-effect preheater is arranged in the first-effect heat exchanger, a second-effect preheater is arranged in the second-effect heat exchanger, a third-effect preheater is arranged in the third-effect heat exchanger, a first-effect distributing pipe is arranged in the first-effect separator, a second-effect distributing pipe is arranged in the second-effect separator, a third-effect distributing pipe is arranged in the third-effect separator, the first effect distributing pipe, the second effect distributing pipe and the third effect distributing pipe are all spiral coil pipe structures, and a plurality of discharging holes are evenly distributed on the bottom surface of the first effect distributing pipe, the second effect distributing pipe and the third effect distributing pipe at intervals along the length direction of the first effect distributing pipe, the lower parts of the first-effect separator, the second-effect separator and the third-effect separator are all in an inverted cone structure, and a plurality of vibrators are uniformly distributed on the outer side wall of the inverted cone structure at intervals; the discharge hole of the material box is communicated with the feed inlet of a feed pump, the discharge hole of the feed pump is communicated with the feed inlet of a triple-effect preheater, the discharge hole of the triple-effect preheater is communicated with the feed inlet of a double-effect preheater, the discharge hole of the single-effect preheater is positioned in a single-effect heat exchanger, the discharge hole at the lower part of the single-effect heat exchanger is communicated with a single-effect distributing pipe, the discharge hole at the bottom of the single-effect separator is communicated with the feed inlet of a single-effect circulating pump, the discharge hole of the single-effect circulating pump is respectively communicated with the feed inlet at the bottom of the single-effect heat exchanger and the feed inlet at the top of the double-effect heat exchanger, the discharge hole at the lower part of the double-effect heat exchanger is communicated with the double-effect distributing pipe, the discharge hole at the bottom of the double-effect separator is communicated with the feed inlet of the double-effect circulating pump, and the discharge hole at the bottom of the double-effect heat exchanger is respectively communicated with the feed inlet of the double-effect heat exchanger and the top of the triple-effect heat exchanger, a discharge hole at the lower part of the triple-effect heat exchanger is communicated with a triple-effect distributing pipe, a discharge hole at the bottom of the triple-effect separator is communicated with a feed inlet of a triple-effect circulating pump, and a discharge hole of the triple-effect circulating pump is respectively communicated with a feed inlet at the bottom of the triple-effect heat exchanger and a feed inlet at the top of the crystallization buffer tank; the vertical (mixing) shaft that just rotates in the crystallization buffer tank is equipped with, it has a plurality of cavitys to be the interval equipartition from top to bottom in the (mixing) shaft, be equipped with the biax motor in the cavity, (mixing) shaft and fixedly connected with puddler are all stretched out to two output shafts of biax motor, the (mixing) shaft bottom is circumference interval equipartition and has a plurality of cross-strut poles, the upper and lower both sides of cross-strut pole tail end all articulate and are equipped with the rotary rod.

Preferably, the discharge port of the feed pump is communicated with the feed inlet of the triple-effect preheater through an inlet pipe, and a flow meter is arranged on the inlet pipe.

Preferably, the top end of the stirring shaft extends out of the crystallization buffer tank and is connected with a stirring motor in a transmission manner.

Preferably, a plurality of stirring support rods are uniformly distributed on the stirring rod along the length direction of the stirring rod at intervals.

Preferably, the primary preheater, the secondary preheater and the tertiary preheater are coiled heat exchangers.

Preferably, the first-effect heat exchanger is a falling film heat exchanger, and the second-effect heat exchanger and the third-effect heat exchanger are double-tube-pass circulating heat exchangers.

Preferably, the first-effect separator, the second-effect separator and the third-effect separator are DTB type crystallization separators.

Preferably, the first-effect circulating pump, the second-effect circulating pump and the third-effect circulating pump are all forced circulating pumps.

The utility model has the advantages that: the utility model relates to a rationally, simple structure, the cooperation that sets up of a imitate pre-heater, two imitate pre-heater and three imitate pre-heater can carry out tertiary gradient intensification to the material earlier before the material gets into an effect heat exchanger heating, makes the intensification to the material steady more orderly, can effectively avoid the material wall built-up and the burnt pipe phenomenon because of sudden temperature rise causes to effectively guarantee going on smoothly of three imitate evaporative concentration, improve its operating efficiency and quality.

One imitates the distributing pipe, the setting of two imitates distributing pipe and triple effect distributing pipe, can be with the more even separator that corresponds of material, more be favorable to carrying out the crystallization separation fast, and the setting of the vibrator of each separator lower part, can vibrate corresponding separator when the crystallization separation, can effectively reduce the crystallization material and pile up or harden the phenomenon in the separator lower part, thereby avoid the discharging pipe of corresponding separator to block up, guarantee the stable normal work of whole evaporative concentration system, the efficiency and the quality of evaporative concentration are improved.

Rotation of a stirring shaft in the crystallization buffer tank can drive a stirring rod on the crystallization buffer tank to do circumferential revolution motion on a horizontal plane, and circumferential rotation motion of the stirring rod on each layer of vertical plane can be realized by utilizing power provided by a double-shaft motor, so that the material on the upper layer and the material on the lower layer are turned over and spewed, the stirring and mixing effects of the stirring rod on the materials can be greatly enhanced, and the stirring efficiency and quality are improved. In addition, the cross-bar can rotate along with the stirring shaft synchronously, the hinged rotary rod on the cross-bar can do unordered rotary motion, stronger turbulent flow can be generated, the bottom layer material can be guaranteed to be fully stirred, so that the materials are mixed more uniformly and completely, and the stirring efficiency and quality are further improved greatly.

Drawings

Fig. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic view of the internal structure of the crystallization buffer tank of the present invention;

fig. 3 is a schematic view of the structure of the first effect distributing pipe of the present invention.

Reference numbers in the figures: the device comprises a material box 1, a feeding pump 2, a feeding pipe 3, a flowmeter 4, a first-effect heat exchanger 5, a first-effect preheater 6, a first-effect separator 7, a first-effect distributing pipe 8, a vibrator 9, a first-effect circulating pump 10, a second-effect heat exchanger 11, a second-effect preheater 12, a second-effect separator 13, a second-effect distributing pipe 14, a second-effect circulating pump 15, a third-effect heat exchanger 16, a third-effect preheater 17, a third-effect separator 18, a third-effect distributing pipe 19, a third-effect circulating pump 20, a crystallization buffer tank 21, a stirring motor 22, a stirring shaft 23, a double-shaft motor 24, a stirring rod 25, a stirring support rod 26, a cross support rod 27, a rotating rod 28 and a discharge hole 29.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1 to 3, a triple-effect evaporation device for waste liquid in the iron phosphate production process comprises a material tank 1, a feeding pump 2, a first-effect heat exchanger 5, a first-effect separator 7, a first-effect circulating pump 10, a second-effect heat exchanger 11, a second-effect separator 13, a second-effect circulating pump 15, a triple-effect heat exchanger 16, a triple-effect separator 18, a triple-effect circulating pump 20 and a crystallization buffer tank 21. Be equipped with one in the first heat exchanger 5 and imitate pre-heater 6, be equipped with two in the two heat exchangers 11 and imitate pre-heater 12, be equipped with three in the three heat exchangers 16 and imitate pre-heater 17, can carry out tertiary gradient intensification to the material earlier before the material gets into the heating of one heat exchanger 5, make the intensification to the material more steady orderly, can effectively avoid because of the material wall built-up and the burnt pipe phenomenon that suddenly the temperature rise caused to effectively guarantee going on smoothly of three-effect evaporation concentration, improve its operating efficiency and quality. A first-effect distributing pipe 8 is arranged in the first-effect separator 7, a second-effect distributing pipe 14 is arranged in the second-effect separator 13, a third-effect distributing pipe 19 is arranged in the third-effect separator 18, the first-effect distributing pipe 8, the second-effect distributing pipe 14 and the third-effect distributing pipe 19 are all of spiral coil structures, and a plurality of discharge holes 29 are uniformly distributed on the bottom surfaces of the first-effect distributing pipe, the second-effect distributing pipe 14 and the third-effect distributing pipe at intervals along the length direction of the bottom surfaces of the spiral coil structures. The lower parts of the first-effect separator 7, the second-effect separator 13 and the third-effect separator 18 are all in an inverted cone structure, and a plurality of vibrators 9 are uniformly distributed on the outer side wall of the inverted cone structure at intervals. The arrangement of the first-effect distributing pipe 8, the second-effect distributing pipe 14 and the third-effect distributing pipe 19 can distribute materials into corresponding separators more uniformly, and is more favorable for rapid crystallization separation, and the arrangement of the vibrator 9 at the lower part of each separator can vibrate the corresponding separator during crystallization separation, so that the phenomenon that crystallized materials are accumulated or hardened at the lower part of the separator can be effectively reduced, thereby avoiding the blockage of the discharging pipe of the corresponding separator, ensuring the stable and normal operation of the whole evaporation concentration system, and improving the efficiency and quality of evaporation concentration;

the discharge port of the material box 1 is communicated with the feed port of the feed pump 2, the discharge port of the feed pump 2 is communicated with the feed port of the triple-effect preheater 17, the discharge port of the triple-effect preheater 17 is communicated with the feed port of the double-effect preheater 12, the discharge port of the double-effect preheater 12 is communicated with the feed port of the first-effect preheater 6, and the discharge port of the first-effect preheater 6 is positioned in the first-effect heat exchanger 5. The lower part discharge port of the first-effect heat exchanger 5 is communicated with a first-effect distributing pipe 8, the bottom discharge port of the first-effect separator 7 is communicated with the feed port of a first-effect circulating pump 10, and the discharge port of the first-effect circulating pump 10 is respectively communicated with the bottom feed port of the first-effect heat exchanger 5 and the top feed port of the second-effect heat exchanger 11. The lower discharge port of the double-effect heat exchanger 11 is communicated with a double-effect distributing pipe 14, the bottom discharge port of the double-effect separator 13 is communicated with the feed port of a double-effect circulating pump 15, and the discharge port of the double-effect circulating pump 15 is respectively communicated with the bottom feed port of the double-effect heat exchanger 11 and the top feed port of the triple-effect heat exchanger 16. The lower discharge port of the triple-effect heat exchanger 16 is communicated with a triple-effect distributing pipe 19, the bottom discharge port of the triple-effect separator 18 is communicated with the feed port of a triple-effect circulating pump 20, and the discharge port of the triple-effect circulating pump 20 is respectively communicated with the bottom feed port of the triple-effect heat exchanger 16 and the top feed port of a crystallization buffer tank 21. In actual use, a steam system, a condensation system and the like are also arranged in the whole triple-effect evaporation system, which is the prior art and is not explained herein;

the crystallization buffer tank 21 is internally provided with a stirring shaft 23 vertically and rotationally, the stirring shaft 23 is internally provided with a plurality of cavities uniformly distributed at intervals from top to bottom, a double-shaft motor 24 is arranged in each cavity, and two output shafts of the double-shaft motor 34 extend out of the stirring shaft 23 and are fixedly connected with stirring rods 25. The bottom end of the stirring shaft 23 is circumferentially and evenly distributed with a plurality of transverse supporting rods 27 at intervals, and the upper side and the lower side of the tail end of each transverse supporting rod 27 are hinged with rotating rods 28. The rotation of (mixing) shaft 23 can drive puddler 25 above that to do circumference revolution motion on the horizontal plane, utilizes the power that biax motor 24 provided to realize puddler 25 circumference rotation motion on each layer vertical plane simultaneously, makes to form between the upper and lower layer material and billows to can strengthen puddler 25 greatly to the stirring mixing effect of material, improve stirring efficiency and quality. In addition, horizontal pole support 27 can be along with the (mixing) shaft synchronous rotation, and unordered rotary motion can be done to articulated rotary rod 28 on the horizontal pole support 27, can produce stronger turbulent flow, guarantees that the bottom material also can obtain intensive mixing to mix more evenly between the messenger's material, further improve stirring efficiency and quality greatly.

In this embodiment, the discharge port of the feed pump 2 is communicated with the feed inlet of the triple-effect preheater 17 through the feed pipe 3, and the feed pipe 3 is provided with the flowmeter 4, so that the amount of the fed materials can be conveniently recorded. The top of (mixing) shaft 23 stretches out crystallization buffer tank 21 and the transmission is connected with agitator motor 22 for when using, utilize agitator motor 22 to provide power, alright drive (mixing) shaft 23 and rotate, the cooperation realizes mixing the stirring of the material after the evaporation concentration. A plurality of stirring struts 26 are uniformly distributed on the stirring rod 25 along the length direction at intervals, so that the stirring effect can be further enhanced, and the stirring efficiency and quality are improved.

In the present embodiment, the primary preheater 6, the secondary preheater 12 and the tertiary preheater 17 are all coil heat exchangers. The first-effect heat exchanger 5 is a falling film heat exchanger, and the second-effect heat exchanger 11 and the third-effect heat exchanger 16 are double-tube-pass circulating heat exchangers, so that the flow of materials can be reduced by half on the original basis, the flow speed is improved, the flow is reduced, and the heat transfer efficiency is increased and the energy consumption is reduced. The first-effect separator 7, the second-effect separator 13 and the third-effect separator 18 are all DTB type crystallization separators. The first-effect circulating pump 10, the second-effect circulating pump 15 and the third-effect circulating pump 20 are all forced circulating pumps.

The utility model discloses a theory of operation: the utility model discloses when using, the material flow is: the material in the material tank 1 is fed into the triple-effect preheater 17 through the feeding pipe 3 by the feeding pump 2. Then, the materials are preheated and heated in a three-level gradient mode through a three-effect preheater 17, a two-effect preheater 12 and a one-effect preheater 6 and then enter a one-effect heat exchanger 5. Then, the materials are continuously heated in the first-effect heat exchanger 5, and after the heating, the materials uniformly enter the first-effect separator 7 through the first-effect distributing pipe 8 for crystallization separation. And then, the material returns to the first-effect heat exchanger 5 again for secondary heating under the action of the first-effect circulating pump 10, and then continuously enters the first-effect separator 7 for crystallization separation. And circulating in the way until the concentration meets the requirement, and continuously conveying the materials to the double-effect heat exchanger 11 by the single-effect circulating pump 10. Then, the materials are continuously heated in the two-effect heat exchanger 11 and crystallized and separated in the two-effect separator 13, and are circulated under the action of the two-effect circulating pump 15 until the concentration reaches the requirement, and then the materials are continuously sent to the three-effect heat exchanger 16 by the two-effect circulating pump 15. Then, the materials are continuously heated in the triple-effect heat exchanger 16 and crystallized and separated in the triple-effect separator 18, and are circulated under the action of the triple-effect circulating pump 20 until the concentration reaches the requirement, and the materials are sent to the crystallization buffer tank 21 by the triple-effect circulating pump 20 to be subjected to pressure regulation and homogenization, so that triple-effect evaporation and concentration of the materials are realized. In the process, the steam flow and the condensation flow are both in the prior art and are not explained here.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. A three-effect evaporation device for waste liquid in the iron phosphate production process comprises a material tank, a feeding pump, a one-effect heat exchanger, a one-effect separator, a one-effect circulating pump, a two-effect heat exchanger, a two-effect separator, a two-effect circulating pump, a three-effect heat exchanger, a three-effect separator, a three-effect circulating pump and a crystallization buffer tank, it is characterized in that a first-effect preheater is arranged in the first-effect heat exchanger, a second-effect preheater is arranged in the second-effect heat exchanger, a third-effect preheater is arranged in the third-effect heat exchanger, a first-effect distributing pipe is arranged in the first-effect separator, a second-effect distributing pipe is arranged in the second-effect separator, a third-effect distributing pipe is arranged in the third-effect separator, the first effect distributing pipe, the second effect distributing pipe and the third effect distributing pipe are all spiral coil pipe structures, and a plurality of discharging holes are evenly distributed on the bottom surface of the first effect distributing pipe, the second effect distributing pipe and the third effect distributing pipe at intervals along the length direction of the first effect distributing pipe, the lower parts of the first-effect separator, the second-effect separator and the third-effect separator are all in an inverted cone structure, and a plurality of vibrators are uniformly distributed on the outer side wall of the inverted cone structure at intervals; the discharge hole of the material box is communicated with the feed inlet of a feed pump, the discharge hole of the feed pump is communicated with the feed inlet of a triple-effect preheater, the discharge hole of the triple-effect preheater is communicated with the feed inlet of a double-effect preheater, the discharge hole of the single-effect preheater is positioned in a single-effect heat exchanger, the discharge hole at the lower part of the single-effect heat exchanger is communicated with a single-effect distributing pipe, the discharge hole at the bottom of the single-effect separator is communicated with the feed inlet of a single-effect circulating pump, the discharge hole of the single-effect circulating pump is respectively communicated with the feed inlet at the bottom of the single-effect heat exchanger and the feed inlet at the top of the double-effect heat exchanger, the discharge hole at the lower part of the double-effect heat exchanger is communicated with the double-effect distributing pipe, the discharge hole at the bottom of the double-effect separator is communicated with the feed inlet of the double-effect circulating pump, and the discharge hole at the bottom of the double-effect heat exchanger is respectively communicated with the feed inlet of the double-effect heat exchanger and the top of the triple-effect heat exchanger, a discharge hole at the lower part of the triple-effect heat exchanger is communicated with a triple-effect distributing pipe, a discharge hole at the bottom of the triple-effect separator is communicated with a feed inlet of a triple-effect circulating pump, and a discharge hole of the triple-effect circulating pump is respectively communicated with a feed inlet at the bottom of the triple-effect heat exchanger and a feed inlet at the top of the crystallization buffer tank; the vertical (mixing) shaft that just rotates in the crystallization buffer tank is equipped with, it has a plurality of cavitys to be the interval equipartition from top to bottom in the (mixing) shaft, be equipped with the biax motor in the cavity, (mixing) shaft and fixedly connected with puddler are all stretched out to two output shafts of biax motor, the (mixing) shaft bottom is circumference interval equipartition and has a plurality of cross-strut poles, the upper and lower both sides of cross-strut pole tail end all articulate and are equipped with the rotary rod.

2. The triple-effect evaporation device for the waste liquid in the iron phosphate production process according to claim 1, wherein a discharge port of the feeding pump is communicated with a feeding port of a triple-effect preheater through a feeding pipe, and a flow meter is arranged on the feeding pipe.

3. The triple-effect evaporation device for the waste liquid in the iron phosphate production process according to claim 1, wherein the top end of the stirring shaft extends out of the crystallization buffer tank and is in transmission connection with a stirring motor.

4. The triple-effect evaporation device for the waste liquid in the iron phosphate production process according to claim 1, wherein a plurality of stirring support rods are uniformly distributed on the stirring rod along the length direction of the stirring rod at intervals.

5. The triple-effect evaporation device for the waste liquid in the iron phosphate production process according to claim 1, wherein the primary preheater, the secondary preheater and the triple-effect preheater are coil heat exchangers.

6. The triple-effect evaporation device for the waste liquid in the iron phosphate production process according to claim 1, wherein the primary heat exchanger is a falling film heat exchanger, and the secondary heat exchanger and the triple-effect heat exchanger are double-tube-pass circulating heat exchangers.

7. The triple-effect evaporation device for the iron phosphate production process waste liquid according to claim 1, characterized in that the primary-effect separator, the secondary-effect separator and the triple-effect separator are DTB type crystal separators.

8. The triple-effect evaporation device for the waste liquid in the iron phosphate production process according to claim 1, wherein the single-effect circulating pump, the double-effect circulating pump and the triple-effect circulating pump are all forced circulating pumps.

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