CN207243465U - The system of low temperature heat energy recovery utilization rate in a kind of raising phosphorous acid production by BEP - Google Patents
The system of low temperature heat energy recovery utilization rate in a kind of raising phosphorous acid production by BEP Download PDFInfo
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- CN207243465U CN207243465U CN201720713287.1U CN201720713287U CN207243465U CN 207243465 U CN207243465 U CN 207243465U CN 201720713287 U CN201720713287 U CN 201720713287U CN 207243465 U CN207243465 U CN 207243465U
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- phosphoric acid
- high concentration
- heat exchange
- low temperature
- heat
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The utility model discloses a kind of system for improving low temperature heat energy recovery utilization rate in phosphorous acid production by BEP, it is related to phosphoric acid production field, it is used to be engaged with hydration tower, and the hydration tower can produce high concentration high temperature phosphoric acid, including heat exchange mechanisms connected in sequence and diluter；The heat exchange mechanisms are used to exchange the heat in high concentration high temperature phosphoric acid by heat exchange medium, the high level heat (such as steam) of recycling is used to produce, high concentration high temperature phosphoric acid is converted into high concentration low temperature phosphoric acid at the same time to import in diluter, the diluter is used to high concentration low temperature phosphoric acid being diluted to low concentration phosphoric acid and imports in hydration tower.The utility model can improve the heat utilization rate for the phosphoric acid hydration process section that temperature is relatively low in phosphorous acid production by BEP, improve economic value.
Description
Technical field
It the utility model is related to phosphoric acid production field, and in particular to one kind improves low temperature heat energy in phosphorous acid production by BEP and recycles
The system of utilization rate.
Background technology
It is that yellow phosphorus obtains phosphorus pentoxide through combustion oxidation that hot method, which prepares phosphoric acid, and phosphorus pentoxide then is passed through hydration tower
Middle absorbed by hydration is made, and the obtained phosphoric acid purity is higher, but phosphorus smelting link belongs to high energy consumption production, causes heat
Phosphoric acid cost prepared by method is higher.
Since yellow phosphorus burning sheet is as exothermic reaction, and obtained phosphorus pentoxide temperature is higher, for this reason, current this area
Relevant device has been developed to be used to absorb yellow phosphorus burning liberated heat and the heat of high temperature phosphorus pentoxide is utilized, with
Reduce the thermal energy used in thermal phosphoric acid processing.
But (phosphorus pentoxide is reacted with water to form phosphoric acid) process section is hydrated in phosphoric acid, it is right that conventional aqueous technique passes through
The continuous feedwater cooling of tower wall is hydrated, the outlet acid temperature of control hydration tower is not higher than 80 DEG C, this results in substantial amounts of high temperature heat
Be reduced low-temperature heat quantity so that the heat utilization rate of hydrating process section can only make simple hot water and use than relatively low, it is difficult to produce compared with
High economic value, while tower wall cooling is also required to consume substantial amounts of water, causes wasting for water resource.
Utility model content
For defect existing in the prior art, the purpose of this utility model is to provide one kind to improve phosphorous acid production by BEP
The system of middle low temperature heat energy recovery utilization rate, it is possible to increase the heat utilization rate of the relatively low phosphoric acid hydration process section of temperature, is improved
Economic value.
To achieve the above objectives, the technical scheme adopted by the utility model is that：
The system of low temperature heat energy recovery utilization rate in a kind of raising phosphorous acid production by BEP, it is used to be engaged with hydration tower,
The hydration tower can produce high concentration high temperature phosphoric acid, including heat exchange mechanisms connected in sequence, circulating slot and diluter；
Described circulating slot one end is connected with hydration tower, the high concentration high temperature phosphoric acid produced for receiving hydration tower, the other end
It is connected with heat exchange mechanisms, for high concentration high temperature phosphoric acid to be imported in heat exchange mechanisms, sour pump is provided with the circulating slot；
The medium for exchanging the heat in high concentration high temperature phosphoric acid, the heat exchange mechanisms are provided with the heat exchange mechanisms
Imported for high concentration high temperature phosphoric acid to be converted into high concentration low temperature phosphoric acid in diluter, the diluter is used for high concentration is low
Warm phosphoric acid is diluted to low concentration phosphoric acid and imports in hydration tower.
Based on the above technical solutions, the heat exchange mechanisms include evaporator, and the evaporator is connected with circulating slot,
The medium is arranged in evaporator, for exchanging the heat in high concentration high temperature phosphoric acid.
Based on the above technical solutions, the heat exchange mechanisms further include preheater, and the preheater is arranged at described
It is hydrated between tower and evaporator, for being preheated to medium；
The preheater is equipped with medium entrance, media outlet, inlet exhaust gas and offgas outlet, the inlet exhaust gas and water
The gas outlet for closing tower is connected, and for importing the phosphorus pentoxide tail gas not being hydrated, tail gas carries out hot friendship with medium in preheater
Change, realize media preheating；The media outlet is connected with evaporator, described for pre-warmed medium to be imported in evaporator
Offgas outlet is used to the tail gas after heat exchange being discharged into subsequent technique production system.
Based on the above technical solutions, acid inlet and air inlet, the air inlet are provided with the top of the hydration tower
Mouthful it is used to exterior phosphorus pentoxide gas importing hydration tower, the acid inlet is connected with diluter, for by low concentration
Phosphoric acid is imported in hydration tower, and high-concentration phosphoric acid is generated with phosphorus pentoxide gas reaction.
Based on the above technical solutions, the middle and upper part of the hydration tower is provided with spraying mechanism, and bottom is provided with out
Gas port, acid mouth, the gas outlet are connected with the inlet exhaust gas of preheater, for the tail gas after hydration tower hydration to be led
Enter into preheater, the acid mouth is connected with circulating slot, the high concentration high temperature phosphoric acid produced for receiving hydration tower.
Based on the above technical solutions, sour pump is provided with the circulating slot, the circulating slot is a sealed shell of tank
And surface is provided with insulating layer.
Compared with prior art, the utility model has the advantage of：
(1) system that the utility model improves low temperature heat energy recovery utilization rate in phosphorous acid production by BEP, including heat exchange mechanisms,
Heat exchange mechanisms include evaporator and preheater, and evaporator is connected with circulating slot, for absorbing the heat in high concentration high temperature phosphoric acid,
One end of preheater is connected with being hydrated the gas outlet of tower, for absorbing the heat in unreacted and the relatively low phosphorus pentoxide of temperature
Amount, and by the heat for heating the medium in above-mentioned heater, the other end of preheater is connected with evaporator, by Jie of preheating
Matter is imported in evaporator, is further heated to be pre- hot medium by absorbing the heat of high concentration high temperature phosphoric acid in evaporator
High energy medium.
Evaporator is closed structure, it is internally provided with pipeline, and the cavity outside pipeline is medium accommodation space, preheater
In medium be passed directly into the internal cavity of evaporator, high concentration high temperature phosphoric acid is inputted by pipeline, and forms heat by tube wall
Conduction constantly carries out heat exchange with medium so that the medium temperature after heat absorption constantly raises, and ultimately forms more than or equal to 150 DEG C
Medium carrier containing high level heat, the thermal energy can be used in the industrial production (saturated vapor as produced pressure >=0.7MPa
Deng), utility value is higher.
(2) system that the utility model improves low temperature heat energy recovery utilization rate in phosphorous acid production by BEP, is made using phosphoric acid,diluted
It is that raw material enters in hydration tower, can not only obtain target product concentrated phosphoric acid, and a large amount of thermal energy that can be produced in absorbing reaction,
Medium is heated using high concentration high temperature phosphoric acid as heat source, can be quickly by heat energy transfer into medium, and due to the portion
Divide the quality of thermal energy higher, medium can be formed to the medium carrier containing high level heat that temperature is more than or equal to 150 DEG C, it is such as full
And steam, high temperature heat conductive oil etc., for production link as synthesized, the process section heat such as drying, reduces the energy consumption in production.
Meanwhile using the unreacted after being hydrated tower and the relatively low tail gas of temperature as another heat source, for pre- thermal medium,
And the pre- thermal medium containing certain thermal energy is imported into evaporator, it is not only effectively sharp for absorbing the heat of high concentration high temperature phosphoric acid
With the thermal energy in tail gas, and medium is preheated, improve the thermal efficiency and heat utilization rate.
(3) system that the utility model improves low temperature heat energy recovery utilization rate in phosphorous acid production by BEP, by being hydrated tower
Interior high concentration high temperature phosphorous acid heat energy directly recycles, and cancels in former phosphoric acid hydrating process using recirculated cooling water to hydration tower
Tower wall cooling, save the consumption of water resource, while reduce production cost.
Brief description of the drawings
Fig. 1 is the knot that the system of low temperature heat energy recovery utilization rate in phosphorous acid production by BEP is improved in the utility model embodiment
Structure schematic diagram.
In figure：1- is hydrated tower, and 2- circulating slots, 3- heat exchange mechanisms, 4- diluters, 5- evaporators, 6- preheaters, 7- is into acid
Mouth, 8- air inlets, 9- gas outlets, 10- acid mouths, 11- medium inlets, 12- media outlets, 13- inlet exhaust gas, 14- tail gas go out
Mouthful, 15- spraying mechanisms, 16- acid pumps.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and embodiments.
Shown in Figure 1, the utility model embodiment provides low temperature heat energy recycling profit in a kind of raising phosphorous acid production by BEP
With the system of rate, it is used to be engaged with hydration tower 1, including circulating slot connected in sequence 2, heat exchange mechanisms 3 and diluter 4, follows
Acid pump 16 is provided with annular groove 2, circulating slot 2 is provided with insulating layer, and following in the utility model for a sealed shell of tank and surface
Annular groove 2, heat exchange mechanisms 3, diluter 4, acid pump 16 are made of resistant material.
2 one end of circulating slot with hydration tower 1 be connected, for receive hydration tower 1 produce high concentration high temperature phosphoric acid, the other end and
Heat exchange mechanisms 3 connect, and medium is provided with heat exchange mechanisms 3, and (medium can be water, oil or other things that can be exchanged heat
Matter), medium can absorb the heat in high concentration high temperature phosphoric acid, and the high concentration low temperature phosphoric acid of generation is imported diluter
In 4, diluter 4 is used to high-concentration phosphoric acid being diluted to low concentration phosphoric acid and imports in hydration tower 1.
Hydration tower 1 in the present embodiment, its top are provided with acid inlet 7 and air inlet 8, and air inlet 8 is used for outside
Phosphorus pentoxide gas imports hydration tower 1, and acid inlet 7 is connected with diluter 4, for by the low concentration after dilution in diluter 4
Phosphoric acid is imported in hydration tower 1, and low concentration phosphoric acid generates high-concentration phosphoric acid in tower is hydrated with phosphorus pentoxide gas reaction, due to
Water in low concentration phosphoric acid is combined into exothermic reaction with phosphorus pentoxide gas so that the temperature of high-concentration phosphoric acid is higher, this reality
Apply in example, the temperature of high-concentration phosphoric acid is higher than 200 DEG C.
The middle and upper part of hydration tower 1 is provided with spraying mechanism 15, and bottom is provided with acid mouth 10 and gas outlet 11, acid mouth 10
It is connected with circulating slot 2, for high-temperature high concentration phosphoric acid to be imported in circulating slot 2, gas outlet 11 is connected with heat exchange mechanisms 3, is used for
Unreacted phosphorus pentoxide is passed through in heat exchange mechanisms 3.
Wherein, the heat exchange mechanisms 3 of the present embodiment include evaporator 5 and preheater 6, and preheater 6 is equipped with medium entrance
11, media outlet 12, inlet exhaust gas 13 and offgas outlet 14, inlet exhaust gas 13 is connected with being hydrated the gas outlet 9 of tower 1, for leading
Enter the phosphorus pentoxide tail gas not being hydrated, the medium in preheater 6 is preheated；Media outlet 12 connects with evaporator 5
Connect, for pre-warmed medium to be imported in evaporator 5, offgas outlet 14 is used to the tail gas after heat exchange being discharged into subsequent technique
Production system.
Evaporator 5 is connected with circulating slot 2, for exchanging the heat in high concentration high temperature phosphoric acid, pre- thermal medium is further
Heat, the medium in the present embodiment selects water, and in evaporator 5, the water after preheating is heated to form saturated vapor.
Evaporator 5 is closed structure, it is internally provided with pipeline (pipeline can be set to snakelike or fold-line-shaped), pipeline
Outside cavity be medium accommodation space, the water in preheater 6 is passed directly into evaporator chamber body, and high concentration high temperature phosphoric acid enters
Inside the pipeline of evaporator 5, water is heated by the heat transfer of tube wall so that after water constantly heat absorption, form temperature and be more than
Saturated vapor (in the present embodiment, the temperature of saturated vapor is 170 DEG C or so) equal to 150 DEG C, can be used in industrial production, profit
It is higher with being worth.
In actual production, the structure of evaporator 5 can be designed according to actual needs, be not restricted to the knot of the application
Structure, and medium can be passed through in pipeline, high concentration high temperature phosphoric acid is passed through in accommodation space, is designed according to this, and medium
For under conditions of water, it is necessary to set a drum be used for collect saturated vapor.
The utility model uses phosphoric acid,diluted to enter as raw material in hydration tower 1, can not only obtain target product concentrated phosphoric acid,
And a large amount of thermal energy that can be produced in absorbing reaction, medium is heated using high concentration high temperature phosphoric acid as heat source, can be fast
Water into medium, and since the quality of the partial heat energy is higher, can be changed into temperature more than or equal to 150 DEG C by speed by heat energy transfer
Saturated vapor, for produce synthesis or drying etc. link, effectively reduce production in energy consumption.
Meanwhile by the unreacted after being hydrated tower 1 and the relatively low tail gas of temperature (main component is phosphorus pentoxide gas)
As another heat source, evaporator 5 is imported for heating water, and using obtained hot water as water raw material, for absorbing high concentration
The heat of high temperature phosphoric acid, the low temperature heat energy being effectively utilized in tail gas, preheats water, while improves and produce saturation steaming
The yield and heat integration rate of vapour.
The system of the utility model when in use, specifically includes following steps：
A, phosphorus pentoxide gas and phosphoric acid,diluted are passed through at the same time into hydration tower 1, phosphoric acid,diluted absorbs phosphorus pentoxide gas
High temperature concentrated phosphoric acid and the tail gas containing Lowlevel thermal energy are generated afterwards.
B, the tail gas for containing Lowlevel thermal energy is passed through heat medium in preheater 6 (water is selected in this example as medium),
Hot water is obtained, hot water and high temperature concentrated phosphoric acid are imported in evaporator 5, high temperature concentrated phosphoric acid constantly heats hot water, ultimately forms full
And steam, the temperature of saturated vapor are more than or equal to 150 DEG C.
High temperature concentrated phosphoric acid after evaporator 5 is imported and is diluted to phosphoric acid,diluted in diluter 4 and is imported by acid inlet 7
It is hydrated in tower 1, using the utility model, it is that 0.7~1.0Mpa saturated vapor amounts are often to produce one ton of phosphoric acid and produce pressure
300Kg, saturated vapor can be used for production heat, effectively increase the thermal energy synthesis profit of the relatively low phosphoric acid hydration process section of temperature
With rate, economic value is improved.
The utility model is not limited to the above embodiment, for those skilled in the art, not
On the premise of departing from the utility model principle, some improvements and modifications can also be made, these improvements and modifications are also considered as this reality
Within new protection domain.The content not being described in detail in this specification belongs to known to professional and technical personnel in the field
The prior art.
Claims (6)
1. a kind of system for improving low temperature heat energy recovery utilization rate in phosphorous acid production by BEP, it is used to be engaged with hydration tower (1),
The hydration tower (1) can produce high concentration high temperature phosphoric acid, it is characterised in that：Including heat exchange mechanisms connected in sequence (3), circulation
Groove (2) and diluter (4)；
Described circulating slot (2) one end is connected with hydration tower (1), the high concentration high temperature phosphoric acid produced for receiving hydration tower (1), separately
One end is connected with heat exchange mechanisms (3), for high concentration high temperature phosphoric acid to be imported in heat exchange mechanisms (3), is set in the circulating slot (2)
It is equipped with acid pump (16)；
The medium for exchanging the heat in high concentration high temperature phosphoric acid, the heat exchange mechanisms are provided with the heat exchange mechanisms (3)
(3) it is used to high concentration high temperature phosphoric acid being converted into high concentration low temperature phosphoric acid importing diluter (4), the diluter (4) is used for
High concentration low temperature phosphoric acid is diluted to low concentration phosphoric acid and is imported in hydration tower (1).
2. a kind of system for improving low temperature heat energy recovery utilization rate in phosphorous acid production by BEP as claimed in claim 1, its feature
It is：The heat exchange mechanisms (3) include evaporator (5), and the evaporator (5) is connected with circulating slot (2), and the medium is arranged on
In evaporator (5), for exchanging the heat in high concentration high temperature phosphoric acid.
3. a kind of system for improving low temperature heat energy recovery utilization rate in phosphorous acid production by BEP as claimed in claim 2, its feature
It is：The heat exchange mechanisms (3) further include preheater (6), and the preheater (6) is arranged at the hydration tower (1) and evaporator
(5) between, for being preheated to medium；
The preheater (6) is equipped with medium entrance (11), media outlet (12), inlet exhaust gas (13) and offgas outlet (14),
The inlet exhaust gas (13) is connected with the gas outlet (9) of hydration tower (1), for importing the phosphorus pentoxide tail gas not being hydrated,
Tail gas carries out heat exchange with medium in preheater (6), realizes media preheating；The media outlet (12) is connected with evaporator (5),
For pre-warmed medium to be imported in evaporator (5), the offgas outlet (14) is used for after the tail gas after heat exchange is discharged into
Continuous technique productions system.
4. a kind of system for improving low temperature heat energy recovery utilization rate in phosphorous acid production by BEP as claimed in claim 3, its feature
It is：Acid inlet (7) and air inlet (8) are provided with the top of the hydration tower (1), the air inlet (8) is used for outside
Phosphorus pentoxide gas imports hydration tower (1), and the acid inlet (7) is connected with diluter (4), for the phosphoric acid of low concentration to be led
Enter to be hydrated in tower (1), high-concentration phosphoric acid is generated with phosphorus pentoxide gas reaction.
5. a kind of system for improving low temperature heat energy recovery utilization rate in phosphorous acid production by BEP as claimed in claim 4, its feature
It is：The middle and upper part of the hydration tower (1) is provided with spraying mechanism (15), and bottom is provided with gas outlet (9), acid mouth (10),
The gas outlet (9) is connected with the inlet exhaust gas (13) of preheater (6), for by by hydration tower (1) hydration after tail gas
It imported into preheater (6), the acid mouth (10) is connected with circulating slot (2), the high concentration produced for receiving hydration tower (1)
High temperature phosphoric acid.
6. a kind of system for improving low temperature heat energy recovery utilization rate in phosphorous acid production by BEP as claimed in claim 5, its feature
It is：The circulating slot (2) is provided with insulating layer for a sealed shell of tank and surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720713287.1U CN207243465U (en) | 2017-06-19 | 2017-06-19 | The system of low temperature heat energy recovery utilization rate in a kind of raising phosphorous acid production by BEP |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720713287.1U CN207243465U (en) | 2017-06-19 | 2017-06-19 | The system of low temperature heat energy recovery utilization rate in a kind of raising phosphorous acid production by BEP |
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| Publication Number | Publication Date |
|---|---|
| CN207243465U true CN207243465U (en) | 2018-04-17 |
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ID=61877072
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720713287.1U Active CN207243465U (en) | 2017-06-19 | 2017-06-19 | The system of low temperature heat energy recovery utilization rate in a kind of raising phosphorous acid production by BEP |
Country Status (1)
| Country | Link |
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| CN (1) | CN207243465U (en) |
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2017
- 2017-06-19 CN CN201720713287.1U patent/CN207243465U/en active Active
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