CN207699201U - A kind of device of purification food-grade carbon-dioxide - Google Patents
A kind of device of purification food-grade carbon-dioxide Download PDFInfo
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- CN207699201U CN207699201U CN201721582723.2U CN201721582723U CN207699201U CN 207699201 U CN207699201 U CN 207699201U CN 201721582723 U CN201721582723 U CN 201721582723U CN 207699201 U CN207699201 U CN 207699201U
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 196
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 100
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 95
- 238000000746 purification Methods 0.000 title claims abstract description 49
- 238000001179 sorption measurement Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000007781 pre-processing Methods 0.000 claims abstract description 8
- 238000011282 treatment Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 56
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 54
- 229910021529 ammonia Inorganic materials 0.000 claims description 27
- 238000006477 desulfuration reaction Methods 0.000 claims description 21
- 230000023556 desulfurization Effects 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000007062 hydrolysis Effects 0.000 claims description 16
- 238000006460 hydrolysis reaction Methods 0.000 claims description 16
- 229910052717 sulfur Inorganic materials 0.000 claims description 15
- 239000011593 sulfur Substances 0.000 claims description 15
- 230000003009 desulfurizing effect Effects 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 239000003245 coal Substances 0.000 abstract description 12
- 238000002309 gasification Methods 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000012535 impurity Substances 0.000 abstract description 5
- 229960004424 carbon dioxide Drugs 0.000 description 77
- 239000007789 gas Substances 0.000 description 54
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 22
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 239000012530 fluid Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 230000000087 stabilizing effect Effects 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 241000790917 Dioxys <bee> Species 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 229910002090 carbon oxide Inorganic materials 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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Abstract
The utility model provides a kind of device of purification food-grade carbon-dioxide, belong to Coal Gasification Technology field, energy consumption is excessive when for solving existing cryogenic rectification method purification food-grade carbon-dioxide, the higher problem of operating cost, the device of the purification food-grade carbon-dioxide, including：Preprocessing module obtains the first logistics for being pre-processed to unstripped gas；Adsorption module obtains the second logistics for carrying out adsorption treatment to first logistics；Liquefaction module obtains third―party logistics for second logistics to be carried out liquefaction processing；Purification module obtains food-grade carbon-dioxide for purifying the third―party logistics.The utility model can effectively remove the impurity in coal gasification apparatus discharge carbon dioxide, obtain the food-grade carbon-dioxide that purity is higher than 99.999%, reliable and stable, relative energy consumption is small, at low cost.
Description
Technical field
The utility model is related to Coal Gasification Technology field more particularly to a kind of devices of purification food-grade carbon-dioxide.
Background technology
Carbon dioxide is considered as the principal element for aggravating Global Greenhouse Effect as a kind of greenhouse gases.In global climate
Under the background persistently to warm, Extreme Weather-climate Events take place frequently.Therefore, greenhouse gas emission is reduced, slows down environment and further dislikes
Change, it is imperative.
Chemical Industry has obtained significant progress as the application field of Coal Clean efficient technique of rainwater utilization in China.By
Higher in Chemical Industry concentration class, the gas concentration lwevel of discharge is high, convenient for carrying out the CO concentrated on a large scale2Trapping purification and
Recycle work.
Existing food-grade carbon-dioxide purification technique mainly has Physical Absorption method, chemical absorption method, membrane separation process, low temperature
Rectification method etc., each purification technique respectively have advantage and disadvantage.According to the properties of gas sources of the carbon dioxide of coal gasification discharge, low temperature essence is often selected
Evaporate method.All using liquefied ammonia liquid gas carbon dioxide, energy consumption is excessive for cryogenic liquefaction part in existing cryogenic rectification technology, fortune
Row cost is higher.
Utility model content
Energy consumption is excessive when in order to solve existing cryogenic rectification method purification food-grade carbon-dioxide, and operating cost is higher to ask
Topic, the utility model are directed to the properties of gas sources of carbon dioxide in current powdered coal pressuring gasified technology, and liquid can be reduced by providing one kind
The device for changing the purification food-grade carbon-dioxide of atmospheric carbon dioxide usage amount, rationally utilizes for CO_2 Resource and provides technology
It ensures.
A kind of device of purification food-grade carbon-dioxide provided by the utility model, including：
Preprocessing module obtains the first logistics for being pre-processed to unstripped gas；
Adsorption module obtains the second logistics for carrying out adsorption treatment to first logistics；
Liquefaction module obtains third―party logistics for second logistics to be carried out liquefaction processing；
Purification module obtains food-grade carbon-dioxide for purifying the third―party logistics.
In a kind of specific embodiment, the preprocessing module includes surge tank and the outlet with the surge tank
First compressor of line connection.
In a kind of specific embodiment, the adsorption module includes：For carrying out desulfurization process to first logistics
Desulfurization unit, and logistics for being exported to the desulfurization unit removed water remove water unit.
In a kind of specific embodiment, the desulfurization unit includes：
The pre- desulfurizing tower that input terminal is connect with the output end pipeline of first compressor；And
The hydrolysis tower that input terminal is connect with the output end pipeline of the pre- desulfurizing tower；And
The fine de-sulfur tower that input terminal is connect with the output end pipeline of the hydrolysis tower.
It is described except water unit includes the output end pipeline of input terminal and the desulfurization unit in a kind of specific embodiment
The drying tower of connection and the second compressor for being connected to the drying tower outlet end.
In a kind of specific embodiment, the purification module includes purifying column, reboiler, throttle valve and gas-liquid separation
Device；The output end of the liquefaction module is connect with the upper input pipeline of the purifying column, the bottom rectifying of the purifying column
Tower output end is connect with the low-temperature receiver input terminal pipeline of the reboiler, low-temperature receiver output end and the purifying column of the reboiler
Rectifying column input terminal pipeline connects；The thermal source inlet of the reboiler is connect with the output end pipeline of the adsorption module, described
The thermal source inlet of reboiler is connected to the thermal source outlet of reboiler, the heat of the reboiler inside the reboiler by pipeline
Source outlet is connect with the liquefaction module pipeline；The outlet at bottom of the reboiler connects the throttle valve by pipeline and inputs
End, the throttle valve output end connect the top input terminal of the gas-liquid separator by pipeline.
In a kind of specific embodiment, the liquefaction module includes working medium carbon dioxide precooling device and ammonia cooler；It is described
The input terminal of working medium carbon dioxide precooling device is connect with the output end pipeline of the adsorption module, the working medium carbon dioxide precooling
The output end of device is connect with the input terminal pipeline of the ammonia cooler；The gas output end of the reboiler is defeated with the ammonia cooler
Enter the connection of end pipe line；The output end of the ammonia cooler is connect with the upper input pipeline of the purifying column.
In a kind of specific embodiment, the top gas outlet of the gas-liquid separator is connected to described carry by pipeline
The cold doubtful device entrance in top of pure tower；The top gas outlet of the gas-liquid separator also first passes through the top of pipeline and the purifying column
The low-temperature receiver entrance of the working medium carbon dioxide precooling device is connected to after portion's fixed gas outlet connection.
The utility model obtains a kind of purification food-grade carbon-dioxide, operates according to the following steps：
Unstripped gas is pre-processed, the first logistics is obtained；
First logistics is subjected to adsorption treatment, obtains the second logistics；
Second logistics is subjected to liquefaction processing, obtains third―party logistics；
The third―party logistics are purified, food-grade carbon-dioxide is obtained.
It is described to pre-process unstripped gas in a kind of specific embodiment, the first logistics is obtained, including：
By surge tank by the unstripped gas voltage stabilizing；
Unstripped gas after voltage stabilizing is inputted into the first compressor and carries out one stage of compression, obtains that pressure is the first predetermined pressure
One logistics；
First logistics is cooled to room temperature.
It is described that first logistics is subjected to adsorption treatment in a kind of specific embodiment, the second logistics is obtained, is wrapped
It includes：
The H in first logistics is removed by pre- desulfurizing tower2S obtains the 4th logistics；
The COS in the 4th logistics is hydrolyzed to H by hydrolysis tower2S and CO2, obtain the 5th logistics；
5th logistics input fine de-sulfur tower is sloughed into H2S obtains the 6th logistics that total sulfur content is less than first threshold；
Drying tower will be inputted after 6th operating mode pattern to room temperature, is removed in the 6th logistics by the drying tower
Moisture and methanol, obtain the 7th logistics that moisture is less than third threshold value less than second threshold and methanol content；
By the second compressor by the 7th logistics multi-stage compression to the second predetermined pressure, the second logistics is obtained.
It is described to purify the third―party logistics in a kind of specific embodiment, food-grade carbon-dioxide is obtained, including：
By third―party logistics input purifying column purification, the bottom rectifying column that the 8th logistics enters the purifying column is obtained；
The 9th logistics input reboiler heating that the rectifying column is exported, obtains the tenth logistics and re-enters the rectifying
Tower, while obtaining the 11st logistics and being exported from the outlet at bottom of the reboiler；
11st logistics is exported to throttle valve, is throttled to third predetermined pressure through the throttle valve；
The 12nd logistics input gas-liquid separator that the throttle valve is exported carries out gas-liquid separation；
Food-grade carbon-dioxide output is obtained after the gas-liquid separator bottom liquid is cooled down.
It is described that second logistics is subjected to liquefaction processing in a kind of specific embodiment, third―party logistics are obtained, are wrapped
It includes：
Second logistics is divided into two parts, portion is sent into working medium carbon dioxide precooling device and is cooled down, another feeding
9th logistics of the reboiler and rectifying column input reboiler carries out heat exchange and obtains cold；
By the 14th logistics of the 13rd logistics of working medium carbon dioxide precooling device output and reboiler output
Common ammonia cooler of being sent into is cooled down, third―party logistics described in ammonia cooler final output.
In a kind of specific embodiment, further include：
The top gas of the gas-liquid separator is exported to the purifying column evaporator overhead condenser as the step of cold fluid；
And
The top fixed gas of the top gas of the gas-liquid separator and the purifying column is exported to the working medium dioxy
The step of cold source of the mdi prepolymer cooler as the working medium carbon dioxide.
The scheme of purification food-grade carbon-dioxide provided by the utility model, after being pre-processed to unstripped gas, according to
The processes such as secondary progress desulfurization, water removal, liquefaction, purification can effectively remove the impurity in coal gasification apparatus discharge carbon dioxide, obtain
Purity is higher than 99.999% food-grade carbon-dioxide.Device provided by the utility model is reliable and stable, and relative energy consumption is small, cost
Low, up to 250,000 tons/year, the carbon dioxide air source generated with coal gasification matches yield, can effectively remove food-class liquid dioxy
Change the harmful substance in carbon, the food-grade carbon-dioxide of production has safety guarantee.In addition, scheme provided by the utility model can fill
Divide the waste heat and waste cold using system, reduces the operating cost of liquefaction workshop section.
Description of the drawings
Fig. 1 is a kind of apparatus structure schematic diagram for purification food-grade carbon-dioxide that the utility model embodiment provides；
Fig. 2 is a kind of operating process flow chart for purification food-grade carbon-dioxide that the utility model embodiment provides；
Fig. 3 is the flow chart of step S2；
Fig. 4 is the flow chart of step S4；
Fig. 5 is the apparatus structure schematic diagram for the purification food-grade carbon-dioxide that the utility model embodiment one provides.
[reference sign]
101, preprocessing module, 102, adsorption module, 103, liquefaction module, 104, purification module, 1, unstripped gas, 2, buffering
Tank outlet streams, the 3, first logistics, the 4, the 4th logistics, the 5, the 5th logistics, the 6, the 6th logistics, the 7, the 7th logistics, the 8, second logistics,
9, the 15th logistics, the 10, the 16th logistics, the 11, the 13rd logistics, the 12, the 14th logistics, the 13, the 17th logistics, 14, third
Logistics, the 15, the 9th logistics, the 16, the 11st logistics, 17, food-grade carbon-dioxide, 18, gas-liquid separator top gas, 19,
One cold fluid, 20, purification column overhead fixed gas, the 21, second cold fluid, the 22, the tenth logistics, 23, vaporization carbon dioxide 24, precooling
Carbon dioxide outlet 25, gas ammonia, V-01, surge tank, C-01, pre- desulfurizing tower, C-02, hydrolysis tower, C-03, fine de-sulfur tower, C-04,
Drying tower, E-01, working medium carbon dioxide precooling device, E-02, ammonia cooler, E-03, reboiler, C-05, purifying column, V-02, gas-liquid
Separator.
Specific implementation mode
In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, below in conjunction with attached drawing
And specific embodiment is described in detail.
Fig. 1 is the structural schematic diagram of the device for the purification food-grade carbon-dioxide that the utility model embodiment provides, such as Fig. 1
Shown in, which includes preprocessing module 101, adsorption module 102, liquefaction module 103 and purification module 104；Wherein, pre- place
Reason module 101 obtains the first logistics for being pre-processed to unstripped gas；Adsorption module 102, for first logistics
Adsorption treatment is carried out, the second logistics is obtained；Liquefaction module 103 obtains third for second logistics to be carried out liquefaction processing
Logistics；Module 104 is purified, for purifying the third―party logistics, food-grade carbon-dioxide is obtained, in addition, purification module 104 is produced
Raw waste heat and waste cold is also transmitted back to liquefaction module 103 and carries out secondary use, reduces the operating cost of liquefaction workshop section.
In the present embodiment, after being pre-processed to unstripped gas, the works such as desulfurization, water removal, liquefaction, purification are carried out successively
Sequence can effectively remove the impurity in coal gasification apparatus discharge carbon dioxide, obtain the food-grade dioxy that purity is higher than 99.999%
Change carbon, device is reliable and stable, and relative energy consumption is small, at low cost.
In a specific embodiment, preprocessing module 101 may include surge tank and the outlet with the surge tank
First compressor of pipeline connection.The buffered tank voltage stabilizing of unstripped gas removes in medium after liquid, into compressor one stage of compression,
Gas pressure reaches 0.3~0.5MPa after compression, and absorption workshop section is entered after being cooled to room temperature.
In a specific embodiment, adsorption module 102 may include desulfurization unit and remove water unit；Wherein, desulfurization list
Member to first logistics for carrying out desulfurization process；Except the logistics that water unit is used to export desulfurization unit removes water.
Preferably, desulfurization unit may include：Input terminal is connect pre- de- with the output end pipeline of first compressor
Sulphur tower；And the hydrolysis tower that input terminal is connect with the output end pipeline of the pre- desulfurizing tower；And input terminal and the hydrolysis tower
Output end pipeline connection fine de-sulfur tower.First logistics first passes through pre- desulfurizing tower and removes H2S, subsequently into hydrolysis tower, hydrolysis
COS is hydrolyzed to H by tower2S and CO2Afterwards H is sloughed into fine de-sulfur tower2S makes the total sulfur content of logistics be less than 0.1ppm, temperature control
Enter follow-up de-watering stage after room temperature.
Preferably, except water unit includes the drying tower of the output end pipeline connection of input terminal and desulfurization unit and is connected to
Second compressor of drying tower outlet end.The logistics of desulfurization unit output enters drying tower, while removing water and methanol.Water content
It is down to 20ppm or less；Methanol content, which is down to after 10ppm or less, enters compressor set, through multi-stage compression to 2.5~3.5MPa, into
Enter workshop section of liquefying.
In a specific embodiment, purification module 104 may include purifying column, reboiler, throttle valve, gas-liquid separator
And storage tank；Wherein, the output end of liquefaction module 103 and the upper input pipeline of purifying column connect, the bottom rectifying of purifying column
The low-temperature receiver input terminal pipeline of tower output end and reboiler connects, the low-temperature receiver output end of reboiler and the rectifying column input terminal of purifying column
Pipeline connects；The thermal source inlet of reboiler is connect with the output end pipeline of adsorption module 102, and the thermal source inlet of reboiler is boiling again
The thermal source outlet of reboiler is connected to inside device by pipeline, the thermal source outlet of reboiler is connect with liquefaction 103 pipeline of module；Again
The outlet at bottom for boiling device connects throttle valve input terminal by pipeline, and throttle valve output end connects the top of gas-liquid separator by pipeline
The outlet at bottom of portion's input terminal, gas-liquid separator connects storage tank by pipeline.In the present embodiment, third―party logistics are entered with liquid to be carried
Pure tower, the liquid CO 2 containing a small amount of light component enters rectifier bottoms, light in unstripped gas after tower bottom reboiler heats
Component is exported by the thermal source outlet of reboiler to purifying column, and tower top is then risen to, in tower top partial condensation；And by purifying column
Liquid CO 2 of the purity higher than 99.99% obtained after into the logistics progress heat exchange of reboiler is flowed by reboiler bottom
Go out, gas-liquid separator is entered after throttle valve throttles to 2.2Mpa and carries out gas-liquid separation, after the cooling of gas-liquid separator bottom liquid
Enter storage tank storage for food-grade carbon-dioxide.
In a specific embodiment, liquefaction module 103 may include working medium carbon dioxide precooling device and ammonia cooler；Working medium two
The input terminal of carbonoxide forecooler is connect with the output end pipeline of adsorption module 102, the output end of working medium carbon dioxide precooling device
It is connect with the input terminal pipeline of ammonia cooler；The gas output end of reboiler and the input terminal pipeline of ammonia cooler connect；Ammonia cooler
The upper input pipeline of output end and purifying column connects.So design, the part hot gas input that adsorption module 102 is exported is again
It boils device and is used to input rectifier bottoms the logistics heating of reboiler, while having reached the second object exported to adsorption module 102
The part cooling effect of stream, takes full advantage of system waste heat, improves energy utilization rate.
In a specific embodiment, the top gas outlet of gas-liquid separator is connected to the top of purifying column by pipeline
Cold doubtful device entrance, using the cold fluid as cold doubtful device；The top gas outlet of gas-liquid separator also first passes through pipeline and purifying column
Top fixed gas outlet connection after be connected to the low-temperature receiver entrance of working medium carbon dioxide precooling device, using pre- as working medium carbon dioxide
The low-temperature receiver of cooler.The residual air cold of gas-liquid separator is further utilized in the present embodiment, further reduced the fortune of liquefaction workshop section
Row cost.
Corresponding to the device for the purification food-grade carbon-dioxide that the utility model embodiment provides, the utility model embodiment
It operates to obtain a kind of purification food-grade carbon-dioxide according to below step.
Fig. 2 show a kind of operating process flow of purification food-grade carbon-dioxide of the utility model embodiment offer
Figure, as shown in Figure 2, which includes the following steps：
S1：Unstripped gas is pre-processed, the first logistics is obtained.
Preferably, step S1 can first pass through surge tank by unstripped gas voltage stabilizing, then by the unstripped gas input first after voltage stabilizing
Compressor carries out one stage of compression, obtains the first logistics that pressure is the first predetermined pressure；Finally the first logistics is cooled to room temperature
Absorption process can be entered.
S2：First logistics is subjected to adsorption treatment, obtains the second logistics.
In the present embodiment, the first logistics is subjected to the adsorption treatments such as desulfurization and water removal, it is higher to obtain carbon dioxide content
Second logistics.
Preferably, as shown in figure 3, step S2 may comprise steps of S21-S25：
S21：The H in the first logistics is removed by pre- desulfurizing tower2S obtains the 4th logistics；
S22：The COS in the 4th logistics is hydrolyzed to H by hydrolysis tower2S and CO2, obtain the 5th logistics；
S23：5th logistics input fine de-sulfur tower is sloughed into H2S obtains the 6th logistics that total sulfur content is less than first threshold；
S24：Drying tower will be inputted after 6th operating mode pattern to room temperature, by drying tower remove the 6th logistics in moisture and
Methanol obtains the 7th logistics that moisture is less than third threshold value less than second threshold and methanol content；
S25：By the second compressor by the 7th logistics multi-stage compression to the second predetermined pressure, the second logistics is obtained.
S3：Second logistics is subjected to liquefaction processing, obtains third―party logistics.
In the present embodiment, the second logistics (the higher gas of carbon dioxide content) is subjected to liquefaction processing, obtains titanium dioxide
The higher liquid of carbon content is as third―party logistics.
S4：Third―party logistics are purified, food-grade carbon-dioxide is obtained.
In the present embodiment, the higher third―party logistics of carbon dioxide content are subjected to carbon dioxide purification, finally obtain food
Grade carbon-dioxide.
Preferably, as shown in figure 4, step S4 can be realized by following steps S41-S45：
S41：By third―party logistics input purifying column purification, the bottom rectifying column that the 8th logistics enters purifying column is obtained；
S42：By the 9th logistics input reboiler heating of rectifying column output, obtains the tenth logistics and re-enters rectifying column,
The 11st logistics is obtained simultaneously to export from the outlet at bottom of reboiler；
In this step, the 9th logistics of rectifying column output is the liquid CO 2 containing a small amount of light component, and rectifying column is defeated
After the 9th logistics gone out is heated by reboiler, the light component in unstripped gas is recycled to purifying column, then rises to tower top, in tower
Top part condenses, and liquid CO 2 of the purity higher than 99.99% is then flowed out as the 11st logistics by reboiler bottom.
S43：11st logistics is exported to throttle valve, is throttled to third predetermined pressure through throttle valve；
S44：The 12nd logistics input gas-liquid separator of throttle valve output is subjected to gas-liquid separation；
S45：Food-grade carbon-dioxide output is obtained after gas-liquid separator bottom liquid is cooled down.
The operating process of the utility model, after being pre-processed to unstripped gas, successively carry out desulfurization, water removal, liquefaction,
The processes such as purification can effectively remove the impurity in coal gasification apparatus discharge carbon dioxide, obtain the food that purity is higher than 99.999%
Grade carbon dioxide.Device provided by the utility model is reliable and stable, and relative energy consumption is small, at low cost, yield up to 250,000 tons/
Year, the carbon dioxide air source generated with coal gasification matches, and can effectively remove the harmful substance in food-class liquid CO 2, raw
The food-grade carbon-dioxide of production has safety guarantee.
In another preferred embodiment, step S3 by the second logistics carry out liquefaction processing process can be：First by
Two logistics are divided into two parts, and portion is sent into working medium carbon dioxide precooling device and is cooled down, another is sent into reboiler and rectifying column is defeated
The 9th logistics for entering reboiler carries out heat exchange acquisition cold；The 13rd logistics that then working medium carbon dioxide precooling device is exported
The 14th logistics with reboiler output is sent into ammonia cooler and is cooled down jointly, ammonia cooler final output third―party logistics.This implementation
In example, the second logistics of part hot gas is inputted into the 9th logistics heating that reboiler inputs rectifier bottoms reboiler, is reached simultaneously
The part cooling effect to the second logistics has been arrived, system waste heat has been taken full advantage of, improves energy utilization rate.
Further, in another preferred embodiment, method provided by the utility model may also include：By gas-liquid separator
Top gas the step of exporting to purifying column evaporator overhead condenser as cold fluid；And by the top gas of gas-liquid separator and
The top fixed gas of purifying column exports the step of cold source as working medium carbon dioxide to working medium carbon dioxide precooling device.This
The residual air cold of gas-liquid separator is further utilized in embodiment, further reduced the operating cost of liquefaction workshop section.
The dress of the purification food-grade carbon-dioxide of the utility model embodiment offer is provided below by specific embodiment
It sets.
Embodiment one
Fig. 5 is the apparatus structure schematic diagram for the purification food-grade carbon-dioxide that the utility model embodiment one provides, such as Fig. 5
Shown, the device of the present embodiment includes：Surge tank V-01, pre- desulfurizing tower C-01, hydrolysis tower C-02, fine de-sulfur tower C-03, drying
Tower C-04, working medium carbon dioxide precooling device E-01, ammonia cooler E-02, reboiler E-03, purifying column C-05, gas-liquid separator V-
02, the throttle valve not indicated in the first compressor, the second compressor and figure.Wherein, unstripped gas is from the input port of surge tank V-01
Input, the output end of surge tank V-01 are sequentially connected the first compressor, pre- desulfurizing tower C-01, hydrolysis tower C-02, fine de-sulfur tower C-
03, drying tower C-04；The output end of drying tower C-04 is respectively connected to the defeated of working medium carbon dioxide precooling device E-01 by pipeline
Enter the thermal source inlet of end and reboiler E-03, the output end of working medium carbon dioxide precooling device E-01 and the heat of reboiler E-03
Source exports the input terminal for being connected to ammonia cooler E-02, the output end of ammonia cooler E-02 and the upper input pipe of purifying column C-05
Line connects；The bottoms purifying column C-05 rectifying column output end is connect with the low-temperature receiver input terminal of reboiler E-03, and reboiler E-03's is cold
The source output terminal right side connects back to the rectifying column input terminal of purifying column C-05, forms a circulation loop；The bottom of reboiler E-03 goes out
Mouth connects throttle valve input terminal by pipeline, and throttle valve output end passes through the top input that pipeline connects gas-liquid separator V-02
End, finally obtained food-grade carbon-dioxide are exported from gas-liquid separator V-02.Further, as shown in Figure 2, gas-liquid separation
The top gas outlet of device V-02 is connected to the cold doubtful device entrance in top of purifying column C-05, the top gas of gas-liquid separator V-02
Outlet is connected to working medium carbon dioxide precooling device E- after also first passing through pipeline and the top fixed gas outlet connection of purifying column C-05
01 low-temperature receiver entrance.
In one embodiment, if the temperature of unstripped gas 1 is 30 DEG C, pressure 0.04MPaG, flow 19.2kNm3/ h,
1 each component concentration of unstripped gas is respectively：CO2：98.5%vol, CO：0.07%, H2：0.08%, N2：0.32%, CH4：
0.00049%, CH3OH：0.02%, H2S：0.13%, COS：0.07%, Ar：0.0004%, then use Fig. 5 shown devices and
Operating process provided by the utility model purifies food-grade carbon-dioxide, includes the following steps：
(1) by 1 buffered tank V-01 voltage stabilizings of unstripped gas, the outlet streams 2 of surge tank V-01 enter the first compressor compresses
It to 0.3MPa, since the temperature of gas increases with pressure and increases, compressed logistics carries cooler through compressor and drops
Temperature enters absorption process to the first logistics 3 after 40 DEG C, is obtained.
(2) first logistics 3 enter pre- desulfurizing tower C-01 and remove major part H2After S, the 4th object of pre- desulfurizing tower C-01 outputs
Stream 4 enters hydrolysis tower C-02, and hydrolysis occurs, and the COS in the 4th logistics 4 is hydrolyzed to H2S and CO2；Hydrolysis tower C-02 outputs
5th logistics 5 enters fine de-sulfur tower C-03, removing residue H2S, total sulfur content drops in the 6th logistics 6 of fine de-sulfur tower C-03 outputs
To 0.06ppm；After drying tower C-04 dryings, the water content of the 7th logistics 7 of drying tower C-04 outputs is down to for 6th logistics 6
7ppm, methanol content are down to 2ppm.7th logistics 7 enters the second compressor and is cooled down respectively through 1.1MPa and 2.5MPa two stages of compression
Afterwards, the second logistics 8 of the second compressor output with pressure 2.5MPa, 40 DEG C of temperature operating mode under enter follow-up cooling workshop section.
A part (the 15th logistics 9 shown in Fig. 5) for second logistics 8 of (3) second compressors output enters working medium two
Precooling (by the regulating valve A controls in Fig. 5), is cooled to -8 DEG C and is sent into ammonia cooler E-02 in carbonoxide forecooler E-01.Second pressure
Contracting machine output the second logistics 8 another part (the 16th logistics 10 shown in Fig. 5) enter reboiler E-03 as heat source (by
Regulating valve B controls), the rectifier bottoms of heating purifying column C-05 export the 9th logistics 15, and obtain cold, and temperature is down to -11
DEG C, it is same to be sent into ammonia cooler E-02, i.e. the 13rd logistics 11 and reboiler E-03 of working medium carbon dioxide precooling device E-01 outputs
14th logistics 12 of output converges is sent into ammonia cooler E-02 for the 17th logistics 13 shown in Fig. 5.
(4) the 17th logistics 13 is cooled to -18 DEG C by ammonia cooler E-02, at this time ammonia cooler E-02 export third―party logistics 14 with
Liquid enters purifying column C-05, and the liquid CO 2 (i.e. the 8th logistics) containing a small amount of light component enters rectifier bottoms, through tower
After bottom exports the 9th logistics 15 to reboiler E-03 heating, the light component in unstripped gas is sent back to purification as the tenth logistics 22
Tower, the tenth logistics 22 rise to tower top, and in tower top partial condensation, fixed gas enters working medium carbon dioxide precooling device E-01 as cold
Source, and liquid CO 2 of the purity higher than 99.99% is flowed out as the 11st logistics 16 by the bottoms reboiler E-01, through throttling
Valve enters gas-liquid separator V-02 after throttling to the 12nd logistics of 2.2Mpa.
(5) temperature of gas-liquid separator V-02 top gas 18 is -16 DEG C, this 18 part output of portion gas to purification
For tower C-05 evaporator overhead condensers as the first cold fluid 19, it is cold that another part with purifying column C-05 tower tops fixed gas 20 is mixed into second
Fluid 21, the second cold fluid 21 enter working medium carbon dioxide precooling device E-01 as low-temperature receiver.Gas-liquid separator V-02 bottom liquids
It is exported as food-grade carbon-dioxide 17 after cooling, such as the storage of exportable value storage tank.
The present embodiment one can effectively remove the impurity in Coal Gasification Technology discharge carbon dioxide, obtain purity and be higher than
99.999% food-grade carbon-dioxide, and the waste heat and waste cold of system are made full use of, reduce the operating cost of liquefaction workshop section.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, under the premise of not departing from principle described in the utility model, several improvements and modifications can also be made, these improvement
The scope of protection of the utility model is also should be regarded as with retouching.
Claims (8)
1. a kind of device of purification food-grade carbon-dioxide, which is characterized in that including：
Preprocessing module obtains the first logistics for being pre-processed to unstripped gas；
Adsorption module obtains the second logistics for carrying out adsorption treatment to first logistics；
Liquefaction module obtains third―party logistics for second logistics to be carried out liquefaction processing；
Purification module obtains food-grade carbon-dioxide for purifying the third―party logistics.
2. the device of purification food-grade carbon-dioxide as described in claim 1, which is characterized in that the preprocessing module includes
Surge tank and the first compressor being connect with the outlet line of the surge tank.
3. the device of purification food-grade carbon-dioxide as claimed in claim 2, which is characterized in that the adsorption module includes：
Desulfurization unit for carrying out desulfurization process to first logistics, and the logistics progress for being exported to the desulfurization unit
Water removal removes water unit.
4. the device of purification food-grade carbon-dioxide as claimed in claim 3, which is characterized in that the desulfurization unit includes：
The pre- desulfurizing tower that input terminal is connect with the output end pipeline of first compressor；And
The hydrolysis tower that input terminal is connect with the output end pipeline of the pre- desulfurizing tower；And
The fine de-sulfur tower that input terminal is connect with the output end pipeline of the hydrolysis tower.
5. the device of purification food-grade carbon-dioxide as described in claim 3 or 4, which is characterized in that described to remove water unit packet
Include the drying tower that input terminal is connect with the output end pipeline of the desulfurization unit and be connected to the drying tower outlet end
Two compressors.
6. the device of purification food-grade carbon-dioxide as described in claim 1, which is characterized in that the purification module includes carrying
Pure tower, reboiler, throttle valve and gas-liquid separator；The upper input pipe of the output end and the purifying column of the liquefaction module
Line connects, and the bottom rectifying column output end of the purifying column is connect with the low-temperature receiver input terminal pipeline of the reboiler, described to boil again
The low-temperature receiver output end of device is connect with the rectifying column input terminal pipeline of the purifying column；The thermal source inlet of the reboiler and the suction
The output end pipeline of attached module connects, and the thermal source inlet of the reboiler is connected to inside the reboiler by pipeline to boil again
The thermal source outlet of device, the thermal source outlet of the reboiler are connect with the liquefaction module pipeline；The outlet at bottom of the reboiler
The throttle valve input terminal is connected by pipeline, the throttle valve output end connects the top of the gas-liquid separator by pipeline
Input terminal.
7. the device of purification food-grade carbon-dioxide as claimed in claim 6, which is characterized in that the liquefaction module includes work
Matter carbon dioxide precooling device and ammonia cooler；The output end of the input terminal and the adsorption module of the working medium carbon dioxide precooling device
Pipeline connects, and the output end of the working medium carbon dioxide precooling device is connect with the input terminal pipeline of the ammonia cooler；It is described to boil again
The gas output end of device is connect with the input terminal pipeline of the ammonia cooler；The output end of the ammonia cooler is upper with the purifying column
Portion's input terminal pipeline connection.
8. the device of purification food-grade carbon-dioxide as claimed in claim 7, which is characterized in that the top of the gas-liquid separator
Portion's gas vent is connected to the cold doubtful device entrance in top of the purifying column by pipeline；The top gas of the gas-liquid separator goes out
Mouth is connected to the working medium carbon dioxide precooling device after also first passing through pipeline and the top fixed gas outlet connection of the purifying column
Low-temperature receiver entrance.
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| CN201721582723.2U CN207699201U (en) | 2017-11-23 | 2017-11-23 | A kind of device of purification food-grade carbon-dioxide |
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| CN201721582723.2U CN207699201U (en) | 2017-11-23 | 2017-11-23 | A kind of device of purification food-grade carbon-dioxide |
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