CN206843069U - A kind of device for preparing thermal phosphoric acid and reclaiming heat energy - Google Patents
A kind of device for preparing thermal phosphoric acid and reclaiming heat energy Download PDFInfo
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- CN206843069U CN206843069U CN201720753155.1U CN201720753155U CN206843069U CN 206843069 U CN206843069 U CN 206843069U CN 201720753155 U CN201720753155 U CN 201720753155U CN 206843069 U CN206843069 U CN 206843069U
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- phosphoric acid
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Abstract
The utility model discloses a kind of device for preparing thermal phosphoric acid and reclaiming heat energy, and it includes yellow phosphorus boiler, it is characterised in that：The outlet of yellow phosphorus boiler is connected with the gas inlet end of micro- absorber, absorbent entrance is provided with micro- absorber and gas-liquid mixture exports, gas-liquid mixture outlet is connected with knockout drum, knockout drum gaseous phase outlet is connected with exhaust gas cooler, exhaust gas cooler is connected with gas treatment equipment, knockout drum liquid-phase outlet is connected with concentrated phosphoric acid cooler, the exhaust gas cooler is provided with soft water import and soft water preheating exports, soft water preheating outlet by pipeline successively with 85 phosphoric acid coolers, concentrated phosphoric acid cooler is connected, the saturation soft water outlet of concentrated phosphoric acid cooler is connected with the steam unit of yellow phosphorus boiler, the utility model can improve the combustion heat of yellow phosphorus, the rate of recovery of the reaction heat of phosphorus pentoxide, be advantageous to save the energy, effectively reduce into production cost.
Description
Technical field
A kind of device for preparing thermal phosphoric acid and reclaiming heat energy is the utility model is related to, belongs to phosphoric acid preparation and Lowlevel thermal energy
Utilization technology field.
Background technology
Phosphoric acid is product among a kind of important chemical industry, is the synthesis phosphorus-containing compound such as most phosphates and partial phosphate ester
Conventional raw material, be widely used in the industries such as food, medicine, electronics, oil, metallurgy, chemical industry.According to production technology, phosphoric acid
Source have phosphoric acid by wet process and thermal phosphoric acid.Phosphoric acid by wet process is to utilize strong acid --- it is typically sulfuric acid, also there is nitric acid, hydrochloric acid, fluorine
Silicic acid occurs metathesis reaction with phosphorus ore and obtains impure more raw phosphoric acid, is generally used for fertilizer., can after the phosphoric acid is purified
Obtain the phosphoric acid of food-grade；Thermal phosphoric acid is that sharp reduction with carbon phosphorus ore obtains yellow phosphorus at high temperature, and the yellow phosphorus that then burns obtains five oxygen
Change two phosphorus, then with obtained by water reaction.Thermal phosphoric acid impurity is few, almost fine before wet phosphoric acid purifying Technique Popularizing
The unique raw material of phosphate product, from the point of view of technological process, compared with thermal phosphoric acid, the technological process of phosphoric acid by wet process is long and multiple
Miscellaneous, unit operation and auxiliary facility are more.But economically, phosphoric acid by wet process has a clear superiority compared with thermal phosphoric acid, thermal phosphoric acid cost
A high major reason is that energy consumption is big.Traditional phosphorous acid production by BEP technique is very extensive.Yellow phosphorus burning and aquation
Reaction heat is directly removed by low-temperature circulating water, becomes low level used heat, it is difficult to utilize, in recent years, in order to reduce thermal phosphoric acid into
This, the recovery of yellow phosphorus phosphoric acid release heat gradually receives much concern, and has also only carried out many correlative study and practice, such as：
Patent of invention CN1355133A Phosphorus combustion heat recovery and utilization device and its thermal phosphoric acid production systems propose
A kind of the combustion heat energy retracting device and a phosphorous acid production by BEP system of similar boiler.The patent focuses on introduction combustion
The device of heat-energy recovering apparatus is burnt, the consideration for the energy recovery technique of the high-temperature tail gas after separating device fails to jump out completely
The pattern of traditional hydrated tower.It is totally different due to air-liquid two-phase physical property and flow, therefore in a manner of hydrated tower jacketed simultaneously
It is very limited with the thermal efficiency of air-liquid two-phase heat exchange.In addition, the species of absorbent in hydrated tower is not known in claim, only exist
Mentioned in embodiment and directly use water, and do not refer to vent gas treatment.
Patent of invention CN201531862U yellow phosphorus burning heat energy recycling devices propose a kind of yellow phosphorus burning more insured
Heat-energy recovering apparatus, it does intermediate heat transfer medium using certain gas, can effectively avoid because the rupture of boiler heat exchange comb causes five
Aoxidize two phosphorus and soft water reaction generation phosphoric acid and etching apparatus, the patent do not refer to that the recovery of the heat of hydration and heat integrate.
A kind of phosphorous acid production by BEP devices with Lowlevel thermal energy recovery of patent of invention CN105731405A propose one kind
It can not propose tail gas heat quantity recovery with the device of recovery section aquation heat energy, gained vapour pressure highest 0.8MPa and heat integrate.
It is a kind of similar that the device of patent of invention CN102910602A dual zone type high efficiente callback heat energy generated during combustion of yellow, which proposes,
The heat-energy recovering apparatus of phosphoric acid-fired boiler, the recovery of device high-temperature tail gas heat energy and hydrated reaction heat is not considered.
The device of patent of invention CN102556990A absorbing heat energy from combustion of yellow phosphorus with heat transfer oil proposes one kind and passes through conduction oil
Exchange heat, then discharge the device of heat, the invention need to use conduction oil and do intermediate heat transfer medium, and not mention device high-temperature tail gas
The recovery of heat energy and hydrated reaction heat.
At present, Patents, the report of document are mostly focused on the technique and equipment of heat energy generated during combustion of yellow recovery, and rarely have
The recovery of aquation heat energy and final tail gas band heat is noticed, does not also refer to the phosphoric acid that various concentrations are prepared into using yellow phosphorus as raw material
Or the overall process system thermal of polyphosphoric acid integrates, therefore energy recovery rate is not high.
Wherein, the utilization of the heat of hydration is very difficult in the hot method acid technique of tradition.The hot method acid technique of tradition is to avoid equipment
Corrosion, is made absorbent using substantial amounts of SAPMAC method acid and phosphorus pentoxide is absorbed in spray column, be no more than with control material temperature
80℃.80 DEG C of heat is difficult by.Therefore, it is necessary to improve the temperature of material in absorption process, and then need to select more
Expensive equipment and materials；For big equipment, upgrade of material means the increasing of equipment investment, and this can weaken heat recovery band
The benefit come, for this reason, it may be necessary to reduce equipment volume as far as possible.
Micro-reacting tcchnology is the new skill gradually controlled in recent years by a strengthening process transmission of extensive concern, accurate process
Art.With the research of micro- Chemical Engineering Technology such as microring array and multiphase microfluidic, micro- heat exchange and mass transfer, minute yardstick reaction constantly obtain into
Exhibition, micro- Chemical Engineering Technology have been widely used in many research fields such as chemistry, chemical industry, material, the energy and environment, and
The fields such as the extensive controllable preparation of nano particle, extraction separation process are strengthened and fine chemicals produces realize commercial Application；
One of implication of bright spot micro-of the technology refers under identical production intensity, bulk or microreactor that process occurs
Characteristic size is especially small relative to large scale equipments such as traditional tower, grooves, so that the miniaturization of factory, becoming more meticulous, being flexibly melted into
For possibility.For various process, the property of system is different, and the degree of above-mentioned micro-is also different, therefore, in micro-reacting tcchnology
In detailed process application, the characteristic size of proportioning is important parameter.
Hydration process in phosphorous acid production by BEP technique is a reactive absorption process.Reaction be embodied in phosphorus pentoxide with
The reaction of water, absorb the phosphorus pentoxide being embodied in gas phase and deviate from, the import of gaseous phase materials is nitrogen, oxygen and gaseous state five
The mixed gas of two phosphorus is aoxidized, and it is mainly nitrogen and oxygen to export, absorbent is mainly the aqueous solution of phosphoric acid or polyphosphoric acid,
Its exit concentration at present, there is no the microreactor for this system higher than import, be this utility model by microreactor
The process is introduced, and proposes suitable microreactor characteristic size.
The content of the invention
The technical problems to be solved in the utility model is to provide a kind of device for preparing thermal phosphoric acid and reclaiming heat energy, can carry
The rate of recovery of the combustion heat of high yellow phosphorus, the reaction heat of phosphorus pentoxide, be advantageous to save the energy, effectively reduce into production cost, can
With overcome the deficiencies in the prior art.
The technical solution of the utility model is：A kind of device for preparing thermal phosphoric acid and reclaiming heat energy, it includes yellow phosphorus pot
Stove, the outlet of yellow phosphorus boiler are connected with the gas inlet end of micro- absorber, and absorbent entrance and gas-liquid are provided with micro- absorber
Mixture outlet, gas-liquid mixture outlet are connected with knockout drum, and knockout drum gaseous phase outlet is connected with exhaust gas cooler, tail gas cooling
Device is connected with gas treatment equipment, and knockout drum liquid-phase outlet is connected with concentrated phosphoric acid cooler, and the exhaust gas cooler is provided with soft
Water inlet and soft water preheating outlet, soft water preheating outlet are connected with 85 phosphoric acid coolers, concentrated phosphoric acid cooler successively by pipeline,
The saturation soft water outlet of concentrated phosphoric acid cooler is connected with the steam unit of yellow phosphorus boiler.
Above-mentioned micro- absorber includes bottom plate and cover plate, the reaction plate being provided with bottom plate and cover plate on one, in cover plate
Turning be provided with absorbent entrance, absorbent passage is provided with the correspondence position of reaction plate, in bottom plate and the upper face of reaction plate
Parallel channels are laid with, is provided with absorbent passage and moves towards vertical dispersion plate with parallel channels, be provided with dispersion plate
Dispersion hole, the groove for being bumped into dispersion plate is provided with the bottom of reaction plate, with being provided with gas on the bottom plate of absorbent passage the same side
Body import, gas-liquid mixture outlet is provided with the reaction plate away from absorbent passage side.
Above-mentioned parallel channels hydraulic radius is 0.05mm-10mm, and the radius of dispersion hole is 0.01mm-2mm, dispersion hole
The angle of axis and parallel channels axis is 20 ° -90 °, and the residence time of material is 1s-60s.
Prior art compares, and the utility model prepares thermal phosphoric acid and reclaims the device of heat energy, the outlet of yellow phosphorus boiler with
The gas inlet end connection of micro- absorber, is provided with absorbent entrance on micro- absorber and gas-liquid mixture exports, gas-liquid mixed
Thing outlet is connected with knockout drum, and knockout drum gaseous phase outlet is connected with exhaust gas cooler, exhaust gas cooler and gas treatment equipment phase
Connection, knockout drum liquid-phase outlet are connected with concentrated phosphoric acid cooler, and the exhaust gas cooler is provided with soft water import and soft water preheating goes out
Mouthful, soft water preheating outlet is connected with 85 phosphoric acid coolers, concentrated phosphoric acid cooler successively by pipeline, the saturation of concentrated phosphoric acid cooler
Soft water outlet is connected with the steam unit of yellow phosphorus boiler, and such device will burn, most of reaction heat of hydration reaction is unified
Recovery, has particularly also carried out heat recovery to tail gas, and the grade height of regenerated heat energy shows that the pressure for producing steam is more than
1.0MPa, it both can be used as factory power, it is also possible to do thermal source；
Micro- absorber includes bottom plate and cover plate, the reaction plate being provided with bottom plate and cover plate on one, at the turning of cover plate
Provided with absorbent entrance, absorbent passage is provided with the correspondence position of reaction plate, is laid in the upper face of bottom plate and reaction plate
There are parallel channels, be provided with absorbent passage and move towards vertical dispersion plate with parallel channels, dispersion hole is provided with dispersion plate,
It is provided with the bottom of reaction plate and is bumped into the groove of dispersion plate, with being provided with gas feed on the bottom plate of absorbent passage the same side,
Away from absorbent passage side reaction plate on be provided with gas-liquid mixture export, such micro- absorber make phosphorus pentoxide with
Most reaction heat that hydrated agent occurs is taken away by phosphate mixture, and small part is stored in gas phase, is advantageous to next step process pair
The recovery of heat；Dispersion plate is used to distributing absorbent in each bar shaped microchannel, to increase the surface area that gas contacts；
Dispersion hole is used to allow absorbent by dispersion plate, to distribute absorbent in each bar shaped microchannel；
Parallel channels provide place for contact of the gas with absorbent and flowing；
Parallel channels hydraulic radius is 0.05mm-10mm, and the radius of dispersion hole is 0.01mm-2mm, the axis of dispersion hole with
The angle of parallel channels axis is 20 ° -90 °, and the residence time of material is 1s-60s, and micro- absorber of such size can be preferably
Heat is absorbed, is advantageous to improve the organic efficiency of heat, meanwhile, more traditional spray absorber, the mass transfer rate of micro- absorber
It hurry up, reaction conversion ratio height, therefore produce intensity and greatly improve, equipment volume is substantially reduced, and the reduction of equipment volume means material
Performance can room for promotion it is big, and excellent material is to ensure that aquation absorbs the key that temperature is high, the heat of hydration can be utilized, then
Other small advantages of person's equipment volume have：Reduced investment, liquid holdup are low, operation is flexible, process regulation is rapid and accurate.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is micro- absorber schematic diagram.
Fig. 3 is the structural representation of dispersion plate.
Fig. 4 is the structural representation of reaction plate.
Wherein, yellow phosphorus boiler 1；Micro- absorber 2；Knockout drum 3；Exhaust gas cooler 4；Exhaust scrubber 5；Concentrated phosphoric acid cooler
6；85 phosphoric acid coolers 7；Acid circulating pump 8；Wash water circulating pump 9；Exhaust fan 10；Absorbent entrance 11；Gas-liquid mixture exports
12；Bottom plate 13；Cover plate 14；Reaction plate 15；Dispersion plate 16；Dispersion hole 17；Gas feed 18.
Embodiment
The utility model discloses a kind of device for preparing thermal phosphoric acid and reclaiming heat energy, and its structure is as shown in figure 1, it includes
Yellow phosphorus boiler 1, the outlet of yellow phosphorus boiler 1 are connected with the end of gas feed 18 of micro- absorber 2, are provided with and are absorbed on micro- absorber 2
Agent entrance 11 and gas-liquid mixture outlet 12, gas-liquid mixture outlet 12 are connected with knockout drum 3, the gaseous phase outlet of knockout drum 3 and tail
Gas Cooler 4 connects, and exhaust gas cooler 4 is connected with gas treatment equipment, the liquid-phase outlet of knockout drum 3 and concentrated phosphoric acid cooler 6
Be connected, the exhaust gas cooler 4 is provided with soft water import and soft water preheating and exported, soft water preheating outlet by pipeline successively with 85 phosphorus
Acid cooler 7, concentrated phosphoric acid cooler 6 are connected, the saturation soft water outlet of concentrated phosphoric acid cooler 6 and the steam unit of yellow phosphorus boiler 1
It is connected.
The structure of micro- absorber 2 is provided with bottom plate 13 and cover plate 14 as shown in Fig. 2 it includes bottom plate 13 and cover plate 14
Reaction plate 15 on one, absorbent entrance 11 is provided with the turning of cover plate 14, is provided with and absorbs in the correspondence position of reaction plate 15
Agent passage, parallel channels are laid with the upper face of bottom plate 13 and reaction plate 15, are provided with absorbent passage and lead to parallel
Road moves towards vertical dispersion plate 16, and dispersion hole 17 is provided with dispersion plate 16, is provided with the bottom of reaction plate 15 and is bumped into dispersion plate
16 groove, with being provided with gas feed 18 on the bottom plate 13 of absorbent passage the same side, away from absorbent passage side
Reaction plate 15 is provided with gas-liquid mixture outlet 12, wherein, the hydraulic radiuses of parallel channels is 0.05mm-10mm, dispersion hole 17
Radius be 0.01mm-2mm, the axis of dispersion hole 17 and the angle of parallel channels axis are 20 ° -90 °, the residence time of material
For 1s-60s.
Principle of Process of the present utility model, first, 5.5t/h liquid phosphor after atomization in yellow phosphorus boiler 1 with
11.7Nm3/s air contacts simultaneously burn.The heat of burning release produces saturation by the soft water in boiler or vapor absorption
Steam or superheated steam, while the gas containing phosphorus pentoxide --- boiler tail furnace gas is cooled.In boiler exhaust gas after cooling
Phosphorus pentoxide reacted in micro- absorber 2 with hydrated agent, generate phosphoric acid or polyphosphoric acid solution --- concentrated phosphoric acid, at the same with
Unreacted oxygen and nitrogen --- aquation tail gas.The hydrated agent is the aqueous solution that P2O5 mass fractions are more than 61.58%, from micro-
The gas-liquid mixture that absorber 2 is discharged realizes separation in knockout drum 3.Gas phase --- aquation tail gas is arranged after demisting from top
Go out, after exhaust gas cooler 4 reclaims heat, then purify through exhaust scrubber 5 and demisting, finally extracted out by tail gas, pass through tail gas
The row of blower fan 10 is to air, and under the conveying of wash water circulating pump 9, a part is recycled to tail gas and washed the wash water of the bottom of exhaust scrubber 5
The water inlet that exhaust scrubber 5 is done after the top of device 5 mixes with desalted water is washed, and another part is used to prepare needed for micro- absorber 2
Hydrated agent.The concentrated phosphoric acid of the bottom of knockout drum 3 after concentrated phosphoric acid cooler 6 reclaims heat, sent to and entered by acid circulating pump 8 by a part
The wash water mixing of absorber 2 in a subtle way, forms the hydrated agent into absorber 2 in a subtle way, another part sends to and done two by acid circulating pump 8
The desalted water mixing of secondary hydrated agent, realize secondary hydration, the acid of generation heat 85.The acid of heat 85 is after 85 phosphoric acid coolers 7 reclaim heat
It is deformed into cold 85 acid --- commercial phosphoric acid.Soft water needed for boiler flows through exhaust gas cooler 4, the cooling of 85 phosphoric acid what is be sequentially connected in series
After the acid of aquation tail air and heat 85 and the heat of concentrated phosphoric acid is separately recovered in device 7, concentrated phosphoric acid cooler 6, the combustion heat is absorbed simultaneously into boiler
It is changed into steam as previously described.
The use of micro- absorber 2：Absorbent adds from absorbent entrance 11, by cover plate 14 below and each layer of reaction plate
Behind gap below 15, enter through the aperture on dispersion plate 16 in the parallel channels above each layer of reaction plate 15 or bottom plate 13
Contact, mix with gas.After absorber 2 in a subtle way is entered from the end of gas feed 18 by the gas of absorbent components, it is assigned to each
In parallel channels above layer reaction plate 15 or bottom plate 13, after mixing is contacted with absorbent, exported in the lump from gas-liquid mixture
Leave micro- absorber 2 in 12 ends.
Embodiment 1：
Micro- absorber 2 used, parallel channels hydraulic radius are 0.05mm, and the radius of dispersion hole 17 is 0.01mm, are disperseed
The axis in hole 17 and the angle of parallel channels axis are 20 °, and the residence time of material is 1s.
Embodiment 2：
Micro- absorber 2 used, parallel channels hydraulic radius are 5mm, and the radius of dispersion hole 17 is 1mm, dispersion hole 17
The angle of axis and parallel channels axis is 55 °, and the residence time of material is 30s
Embodiment 3：
Micro- absorber 2 used, parallel channels hydraulic radius are 10mm, and the radius of dispersion hole 17 is 2mm, dispersion hole 17
The angle of axis and parallel channels axis is 90 °, and the residence time of material is 60s.
By the experiment of embodiment 1,2,3, above-mentioned test data can have a relatively good test structure, and it meets
While the production requirement of thermal phosphoric acid, be advantageous into the recycling of reaction heat and combustion heat heat energy during production again.
Claims (3)
1. a kind of device for preparing thermal phosphoric acid and reclaiming heat energy, it includes yellow phosphorus boiler（1）, it is characterised in that：Yellow phosphorus boiler
（1）Outlet and micro- absorber（2）Gas feed（18）End connection, in micro- absorber（2）It is provided with absorbent entrance（11）
Exported with gas-liquid mixture（12）, gas-liquid mixture outlet（12）With knockout drum（3）It is connected, knockout drum（3）Gaseous phase outlet and tail
Gas Cooler（4）Connection, exhaust gas cooler（4）It is connected with gas treatment equipment, knockout drum（3）Liquid-phase outlet is cold with concentrated phosphoric acid
But device（6）It is connected, the exhaust gas cooler（4）Exported provided with soft water import and soft water preheating, soft water preheating outlet passes through pipeline
Successively with 85 phosphoric acid coolers（7）, concentrated phosphoric acid cooler（6）It is connected, concentrated phosphoric acid cooler（6）Saturation soft water outlet and yellow phosphorus
Boiler（1）Steam unit be connected.
2. the device according to claim 1 for preparing thermal phosphoric acid and reclaiming heat energy, it is characterised in that：Described micro- suction
Receive device（2）Including bottom plate（13）And cover plate（14）, in bottom plate（13）And cover plate（14）In be provided with one on reaction plate（15）,
Cover plate（14）Turning be provided with absorbent entrance（11）, in reaction plate（15）Correspondence position be provided with absorbent passage, in bottom plate
（13）And reaction plate（15）Upper face be laid with parallel channels, at absorbent passage be provided with it is vertical with parallel channels trend
Dispersion plate（16）, in dispersion plate（16）It is provided with dispersion hole（17）, in reaction plate（15）Bottom be provided be bumped into dispersion plate
（16）Groove, in the bottom plate with absorbent passage the same side（13）It is provided with gas feed（18）, away from absorbent passage
The reaction plate of side（15）Gas-liquid mixture is provided with to export（12）.
3. the device according to claim 2 for preparing thermal phosphoric acid and reclaiming heat energy, it is characterised in that：Described is parallel logical
The hydraulic radius in road is 0.05mm-10mm, dispersion hole（17）Radius be 0.01mm-2mm, dispersion hole（17）Axis with it is parallel
The angle of passage axis is 20 ° -90 °, and the residence time of material is 1s-60s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720753155.1U CN206843069U (en) | 2017-06-27 | 2017-06-27 | A kind of device for preparing thermal phosphoric acid and reclaiming heat energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720753155.1U CN206843069U (en) | 2017-06-27 | 2017-06-27 | A kind of device for preparing thermal phosphoric acid and reclaiming heat energy |
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| Publication Number | Publication Date |
|---|---|
| CN206843069U true CN206843069U (en) | 2018-01-05 |
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ID=60802512
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720753155.1U Withdrawn - After Issue CN206843069U (en) | 2017-06-27 | 2017-06-27 | A kind of device for preparing thermal phosphoric acid and reclaiming heat energy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314543A (en) * | 2021-12-10 | 2022-04-12 | 浙江彩蝶实业股份有限公司 | Synthesis process and application of phosphorus-nitrogen flame retardant |
-
2017
- 2017-06-27 CN CN201720753155.1U patent/CN206843069U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314543A (en) * | 2021-12-10 | 2022-04-12 | 浙江彩蝶实业股份有限公司 | Synthesis process and application of phosphorus-nitrogen flame retardant |
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