CN220918617U - Phosphoric acid concentration tail gas vacuum condensing device - Google Patents
Phosphoric acid concentration tail gas vacuum condensing device Download PDFInfo
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- CN220918617U CN220918617U CN202322532880.4U CN202322532880U CN220918617U CN 220918617 U CN220918617 U CN 220918617U CN 202322532880 U CN202322532880 U CN 202322532880U CN 220918617 U CN220918617 U CN 220918617U
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- gas
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- phosphoric acid
- outlet
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 103
- 238000002156 mixing Methods 0.000 claims abstract description 43
- 239000000110 cooling liquid Substances 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 abstract description 7
- 238000009833 condensation Methods 0.000 abstract description 6
- 230000005494 condensation Effects 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 5
- 235000011007 phosphoric acid Nutrition 0.000 description 26
- 238000001816 cooling Methods 0.000 description 10
- 238000001704 evaporation Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007770 graphite material Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- XPPKVPWEQAFLFU-UHFFFAOYSA-N diphosphoric acid Chemical compound OP(O)(=O)OP(O)(O)=O XPPKVPWEQAFLFU-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229940005657 pyrophosphoric acid Drugs 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model discloses a phosphoric acid concentration tail gas vacuum condensing device which comprises a condensate tank, wherein a condensate outlet and a circulating liquid outlet are arranged on the lower side of the condensate tank, and a non-condensable gas outlet and a gas-liquid mixed liquid inlet are arranged on the upper side of the condensate tank; a heat exchanger is arranged in the condensate tank, and a cooling liquid inlet and a cooling liquid outlet of the heat exchanger are respectively connected to the outside of the condensate tank; the gas-liquid mixing chamber is connected with the gas-liquid mixing inlet, the top of the gas-liquid mixing chamber is provided with a circulating liquid inlet which is communicated with the circulating liquid outlet, a circulating pump is arranged in the middle of the circulating liquid inlet, and the side surface of the gas-liquid mixing chamber is provided with a gas inlet. The utility model has the characteristics of difficult blockage, stable operation and low maintenance cost; in addition, the device has the characteristics of being capable of realizing condensation and gas washing at the same time and being more environment-friendly in tail gas emission.
Description
Technical Field
The utility model relates to a high-temperature tail gas condensing device, in particular to a phosphoric acid concentrated tail gas vacuum condensing device.
Background
Phosphoric acid, also known as orthophosphoric acid, is a common inorganic ternary weak acid that is readily deliquescent in air. The pyrophosphoric acid is obtained by water loss during heating, and metaphosphoric acid is obtained by further water loss. Phosphoric acid is mainly used in the industries of pharmacy, food, fertilizer, new energy and the like, and can also be used as a chemical reagent.
In the phosphoric acid production process, evaporation concentration is a core process, and the concentration of the phosphoric acid solution needs to be concentrated from about 25% to about 48%. The phosphoric acid concentration generally adopts a vacuum forced external circulation single-effect evaporation process, the dilute phosphoric acid flowing out of the flash chamber and the supplemented dilute phosphoric acid are conveyed to a tubular graphite heat exchanger through an axial flow pump to exchange heat and then return to the flash chamber for re-evaporation, so that the phosphoric acid concentration is improved, and the discharged tail gas is subjected to cooling treatment through a condenser.
At present, most of commonly used condensers are graphite tube-type heat exchangers, a large amount of impurities enter an evaporation vapor phase in a concentration process, and the evaporation vapor phase can quickly separate out crystals along with the temperature reduction in the condensation process in a tube, so that the condensers become nodes which are most prone to scaling and blocking in an evaporation system, the stable operation of the device is affected, the cleaning workload and the cleaning and overhauling time are increased, and the maintenance cost is increased.
Disclosure of utility model
The utility model aims to provide a vacuum condensing device for phosphoric acid concentrated tail gas. The utility model has the characteristics of difficult blockage, stable operation and low maintenance cost; in addition, the device has the characteristics of being capable of realizing condensation and gas washing at the same time and being more environment-friendly in tail gas emission.
The technical scheme of the utility model is as follows: a phosphoric acid concentration tail gas vacuum condensing device comprises a condensate tank, wherein a condensate outlet and a circulating liquid outlet are arranged on the lower side of the condensate tank, and a non-condensable gas outlet and a gas-liquid mixed liquid inlet are arranged on the upper side of the condensate tank; a heat exchanger is arranged in the condensate tank, and a cooling liquid inlet and a cooling liquid outlet of the heat exchanger are respectively connected to the outside of the condensate tank; the gas-liquid mixing chamber is connected with the gas-liquid mixing inlet, the top of the gas-liquid mixing chamber is provided with a circulating liquid inlet which is communicated with the circulating liquid outlet, a circulating pump is arranged in the middle of the circulating liquid inlet, and the side surface of the gas-liquid mixing chamber is provided with a gas inlet.
In this scheme, through setting up the side at the gas-liquid mixing chamber with gas inlet, simultaneously, the entry setting that will be used for the circulation liquid of condensation is at the top of gas-liquid mixing chamber, when spraying low temperature circulation liquid, has realized the cooling and the absorbing dual purpose of gas washing to the concentrated tail gas of phosphoric acid, and exhaust emission is more environmental protection, and directly mixes the back with low temperature circulation liquid, can avoid crystallization, and entire system is difficult for blockking up, and the operation is stable, and the maintenance cost is low.
Preferably, in the phosphoric acid concentration tail gas vacuum condensing device, the heat exchanger is a graphite partition wall type heat exchanger. The partition wall type heat exchanger made of graphite is preferable in the scheme, and has high heat exchange efficiency, low cost and corrosion resistance.
Preferably, in the foregoing vacuum condensation device for phosphoric acid concentration tail gas, the heat exchanger includes a heat exchange shell, a lower chamber and an upper chamber are respectively arranged at the lower end and the upper end in the heat exchange shell, the lower chamber and the upper chamber are communicated through a plurality of longitudinal holes, and a plurality of transverse holes alternately arranged with the longitudinal holes are transversely penetrated in the heat exchange shell; wherein the lower chamber is divided into two independent chambers by a partition plate, one of which is communicated with the cooling liquid inlet and the other of which is communicated with the cooling liquid outlet. The structure of the heat exchanger is optimized in the scheme, the integration degree is high, the structure is simple, the cost is low, and the heat exchange efficiency is high.
Preferably, in the foregoing vacuum condensing device for phosphoric acid concentration tail gas, a vertical shaft hole is formed in the middle of the heat exchange shell, one end of the transverse hole is communicated with the outside of the heat exchange shell, and the other end of the transverse hole is communicated with the vertical shaft hole. According to the scheme, the vertical shaft hole is arranged, the flow of the circulating liquid is promoted by the pressure difference generated by the temperature difference through the vertical shaft hole, and the cooling speed of the circulating liquid is improved.
Preferably, in the phosphoric acid concentration tail gas vacuum condensing device, a nozzle is arranged at the circulating liquid inlet at the top end inside the gas-liquid mixing chamber. According to the scheme, the nozzle is arranged, and negative pressure is formed in the gas-liquid mixing chamber by utilizing high-speed liquid flow generated during circulating liquid spraying, so that vacuum pumping phosphoric acid concentration tail gas is formed, the external connection of an additional vacuum system is omitted, the system structure is simpler, and the equipment cost is lower.
Preferably, in the phosphoric acid concentration tail gas vacuum condensing device, a diffusion pipe is arranged between the lower end of the gas-liquid mixing chamber and the gas-liquid mixed liquid inlet. This scheme has further improved gas-liquid mixing pressure through setting up the diffusion tube, and it is more abundant to mix, and cooling and gas washing effect are better.
The utility model has the beneficial effects that:
1. According to the utility model, the gas inlet is arranged on the side surface of the gas-liquid mixing chamber, and the inlet of the circulating liquid for condensation is arranged on the top of the gas-liquid mixing chamber, so that the dual purposes of cooling and gas washing absorption of the phosphoric acid concentrated tail gas are realized when the low-temperature circulating liquid is sprayed, the tail gas emission is more environment-friendly, crystallization can be avoided after the tail gas is directly mixed with the low-temperature circulating liquid, the whole system is not easy to block, the operation is stable, and the maintenance cost is low.
2. The utility model is preferably a graphite partition wall type heat exchanger, which has high heat exchange efficiency, low cost and corrosion resistance.
3. The utility model prefers the structure of the heat exchanger, has high integration degree, simple structure, low cost and high heat exchange efficiency.
4. According to the utility model, the vertical shaft hole is arranged, so that the flow of the circulating liquid can be promoted by utilizing the pressure difference generated by the temperature difference through the vertical shaft hole, and the cooling speed of the circulating liquid is improved.
5. According to the utility model, the nozzle is arranged, and negative pressure is formed in the gas-liquid mixing chamber by utilizing high-speed liquid flow generated during the ejection of the circulating liquid, so that vacuum pumping phosphoric acid concentration tail gas is formed, the external connection of an additional vacuum system is omitted, the system structure is simpler, and the equipment cost is lower.
6. According to the utility model, the diffusion pipe is arranged, so that the gas-liquid mixing pressure is further improved, the mixing is more complete, and the cooling and gas washing effects are better.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of the heat exchanger of the present utility model;
FIG. 3 is a cross-sectional view of the lower chamber of the heat exchanger of the present utility model;
FIG. 4 is a cross-sectional view of the upper chamber of the heat exchanger of the present utility model;
Reference numerals illustrate: the device comprises a 1-condensate tank, a 2-condensate outlet, a 3-circulating liquid outlet, a 4-noncondensable gas outlet, a 5-gas-liquid mixed liquid inlet, a 6-heat exchanger, a 7-cooling liquid inlet, an 8-cooling liquid outlet, a 9-gas-liquid mixing chamber, a 10-circulating liquid inlet, a 11-gas inlet, a 12-nozzle, a 13-circulating pump, a 14-diffusion pipe, a 61-heat exchange shell, a 62-lower chamber, a 63-upper chamber, a 64-longitudinal hole, a 65-transverse hole, a 66-partition plate and a 67-vertical shaft hole.
Detailed Description
The utility model is further illustrated by the following figures and examples, which are not intended to be limiting.
Embodiments of the utility model:
A vacuum condensing device for phosphoric acid concentrated tail gas is disclosed in the accompanying drawings 1-4, and comprises a condensate box 1, wherein a condensate outlet 2 and a circulating liquid outlet 3 are arranged on the lower side of the condensate box 1, and a non-condensable gas outlet 4 and a gas-liquid mixed liquid inlet 5 are arranged on the upper side of the condensate box 1;
a heat exchanger 6 is arranged in the condensate tank 1, and a cooling liquid inlet 7 and a cooling liquid outlet 8 of the heat exchanger 6 are respectively connected to the outside of the condensate tank 1;
The gas-liquid mixing chamber 9 is connected to the gas-liquid mixing chamber 5, a circulating liquid inlet 10 is arranged at the top of the gas-liquid mixing chamber 9, the circulating liquid inlet 10 is communicated with the circulating liquid outlet 3, a circulating pump 13 is arranged in the middle of the circulating liquid inlet 10, and a gas inlet 11 is arranged on the side face of the gas-liquid mixing chamber 9.
The specific working principle of the embodiment is as follows: the condensate tank 1 is provided with low-temperature condensate in advance, the condensate completely submerges the heat exchanger 6, when the condensate tank works, the circulating pump 13 works, the low-temperature condensate in the condensate tank 1 is conveyed to the top of the gas-liquid mixing chamber 9 through the circulating liquid outlet 3 and is sprayed into the gas-liquid mixing chamber 9 through the circulating liquid inlet 10, meanwhile, phosphoric acid tail gas generated in the concentration system enters the gas-liquid mixing chamber 9 through the gas inlet 11 under the action of an external vacuum system, gas-liquid mixing is completed in the gas-liquid mixing chamber 9, and enters the condensate tank 1 through the gas-liquid mixing liquid inlet 5, condensation and washing of high-temperature phosphoric acid tail gas are realized in the gas-liquid mixing process, all water-soluble impurities are absorbed by the condensate, and noncondensable gas is emptied through the noncondensable gas outlet 4.
The condensed liquid after absorbing heat exchanges heat with external cooling liquid under the action of the heat exchanger 6, and is cooled to 20 ℃ so as to be convenient for continuous recycling, and when the condensed liquid absorbs excessive impurities and has high saturation, the condensed liquid is discharged from the condensed liquid outlet 2 for replacement.
In a preferred embodiment, as shown in fig. 1-4, the heat exchanger 6 is a graphite dividing wall type heat exchanger, and the specific graphite dividing wall type heat exchanger can be of a conventional structure.
In a preferred embodiment, as shown in fig. 1-4, the heat exchanger 6 includes a heat exchange housing 61, a lower chamber 62 and an upper chamber 63 are respectively disposed at the lower end and the upper end in the heat exchange housing 61, the lower chamber 62 and the upper chamber 63 are communicated through a plurality of longitudinal holes 64, and a plurality of transverse holes 65 alternately disposed with the longitudinal holes 64 are transversely disposed in the heat exchange housing 61; wherein the lower chamber 62 is divided by a partition 66 into two separate chambers, one of which is in communication with the coolant inlet 7 and the other of which is in communication with the coolant outlet 8.
In the heat exchanger 6 of the present embodiment, the heat exchange housing 61 is made of a monolithic graphite material, and the chambers and the channels thereof are all processed in the monolithic graphite material. During heat exchange, cooling water enters one side of the lower chamber 62 from the cooling liquid inlet 7, then rises into the upper chamber 63 through the longitudinal hole 64 on the side, then flows downwards into the other side of the lower chamber 62 through the longitudinal hole 64 on the other side, then is discharged from the cooling liquid outlet 8, and exchanges heat with high-temperature condensate in the transverse hole 65 in the flowing process of the cooling water in the longitudinal hole 64, so that the temperature of the condensate is reduced, and under the action of a pressure difference caused by a temperature difference, the condensate continuously flows in the transverse hole 65, and cooling of the condensate is completed.
In a preferred embodiment, as shown in fig. 1-4, a vertical shaft hole 67 is formed in the middle of the heat exchange housing 61, and one end of the transverse hole 65 is communicated with the outside of the heat exchange housing 61, and the other end is communicated with the vertical shaft hole 67. The vertical axis holes 67 of this embodiment provide more flow channels for condensate flow, facilitating cooling of condensate.
In the preferred embodiment, as shown in fig. 1-4, a nozzle 12 is arranged at a circulating liquid inlet 10 at the top end of the gas-liquid mixing chamber 9. After being sprayed out by the nozzle 12, the circulating liquid flows at a high speed to form negative pressure in the gas-liquid mixing chamber 9, and under the action of the negative pressure, the phosphoric acid tail gas in the concentration system can be directly sucked into the gas-liquid mixing chamber 9.
In the preferred embodiment, as shown in fig. 1-4, a diffusion tube 14 is arranged between the lower end of the gas-liquid mixing chamber 9 and the gas-liquid mixed liquid inlet 5. The diffusion tube 14 has a shape with small ends and large middle, and after the gas-liquid mixture sprayed out at high speed through the gas-liquid mixing chamber 9 enters the diffusion tube 14, the flow speed is reduced, the pressure is increased, and the compression cooling of the gas and the absorption of impurities are promoted.
While the invention has been described with reference to the preferred embodiments, it should be understood that the invention is not limited to the embodiments described above, but is intended to cover modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (6)
1. A phosphoric acid concentration tail gas vacuum condensing device is characterized in that: the device comprises a condensate tank (1), wherein a condensate outlet (2) and a circulating liquid outlet (3) are arranged at the lower side of the condensate tank (1), and a non-condensable gas outlet (4) and a gas-liquid mixed liquid inlet (5) are arranged at the upper side of the condensate tank;
A heat exchanger (6) is arranged in the condensate tank (1), and a cooling liquid inlet (7) and a cooling liquid outlet (8) of the heat exchanger (6) are respectively connected to the outside of the condensate tank (1);
the gas-liquid mixing chamber (9) is connected to the gas-liquid mixing inlet (5), a circulating liquid inlet (10) is formed in the top of the gas-liquid mixing chamber (9), the circulating liquid inlet (10) is communicated with the circulating liquid outlet (3), a circulating pump (13) is arranged in the middle of the circulating liquid inlet, and a gas inlet (11) is formed in the side face of the gas-liquid mixing chamber (9).
2. The phosphoric acid concentration tail gas vacuum condensing apparatus according to claim 1, wherein: the heat exchanger (6) is a graphite dividing wall type heat exchanger.
3. The phosphoric acid concentration tail gas vacuum condensing device according to claim 1 or 2, characterized in that: the heat exchanger (6) comprises a heat exchange shell (61), a lower chamber (62) and an upper chamber (63) are respectively arranged at the lower end and the upper end in the heat exchange shell (61), the lower chamber (62) and the upper chamber (63) are communicated through a plurality of longitudinal holes (64), and a plurality of transverse holes (65) which are alternately arranged with the longitudinal holes (64) are transversely penetrated in the heat exchange shell (61); wherein the lower chamber (62) is divided into two separate chambers by a partition (66), one of which is in communication with the coolant inlet (7) and the other of which is in communication with the coolant outlet (8).
4. A phosphoric acid concentration tail gas vacuum condensing apparatus according to claim 3, characterized in that: the middle part of heat exchange shell (61) is equipped with vertical shaft hole (67), the one end of horizontal hole (65) switches on with the outside of heat exchange shell (61), and the other end switches on with vertical shaft hole (67).
5. The phosphoric acid concentration tail gas vacuum condensing apparatus according to claim 1, wherein: a nozzle (12) is arranged at a circulating liquid inlet (10) at the top end inside the gas-liquid mixing chamber (9).
6. The phosphoric acid concentration tail gas vacuum condensing apparatus according to claim 5, wherein: a diffusion pipe (14) is arranged between the lower end of the gas-liquid mixing chamber (9) and the gas-liquid mixing liquid inlet (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322532880.4U CN220918617U (en) | 2023-09-18 | 2023-09-18 | Phosphoric acid concentration tail gas vacuum condensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322532880.4U CN220918617U (en) | 2023-09-18 | 2023-09-18 | Phosphoric acid concentration tail gas vacuum condensing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220918617U true CN220918617U (en) | 2024-05-10 |
Family
ID=90941334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322532880.4U Active CN220918617U (en) | 2023-09-18 | 2023-09-18 | Phosphoric acid concentration tail gas vacuum condensing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220918617U (en) |
-
2023
- 2023-09-18 CN CN202322532880.4U patent/CN220918617U/en active Active
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