CN102872677A - Method for frequency-variable pressure-variable adsorption purification enrichment of carbon dioxide in sugar refinery flue gas - Google Patents
Method for frequency-variable pressure-variable adsorption purification enrichment of carbon dioxide in sugar refinery flue gas Download PDFInfo
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- CN102872677A CN102872677A CN2012103577789A CN201210357778A CN102872677A CN 102872677 A CN102872677 A CN 102872677A CN 2012103577789 A CN2012103577789 A CN 2012103577789A CN 201210357778 A CN201210357778 A CN 201210357778A CN 102872677 A CN102872677 A CN 102872677A
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Abstract
A method for frequency-variable pressure-variable adsorption purification enrichment of carbon dioxide in sugar refinery flue gas comprises the following process steps: dedusting flue gas and removing slag through a water scrubber, dehydrating through a composite molecular sieve, performing compression, feeding the flue gas into a buffer tank, finally delivering the flue gas from the bottom of an adsorption tower into a pressure-variable adsorption system with a constant speed, performing pressure-variable adsorption separation, purification, and enrichment of the carbon dioxide in the flue gas. The invention applies composite molecular sieve refined dehydration and frequency-variable pressure-variable adsorption technology to the dehydration and decarburization of sugar refinery flue gas, solves the problems of equipment corrosion caused by water and acidic gas in the flue gas and influence on normal production due to instable flue gas flow, improves the purification effect of the flue gas, realizes green, energy saving, low carbon, emission reduction, safety, stability, and high efficiency for the obtaining of high-purity carbon dioxide, and provides a new mode for the realization of industrialized, integrated large-scale development of sugar refinery flue gas.
Description
Technical field
The present invention relates to stack gas cleaning enrichment and comprehensive utilization, the especially method of variable-frequency variable-voltage adsorption cleaning enrichment sugar refinery carbon dioxide in flue gas.
Background technology
Entered since 21 century, the consumption of Chinese sugar is with the speed increment of average annual 5%-7%, and consumption figure and output of sugar account for respectively second place of the world and the 3rd.Wherein, Guangxi sugar output accounts for more than 60% of national output of sugar, and press for extracting juice season Guangxi candy output was about 7,200,000 tons in 2011/2012 year.The Guangxi required energy of most of cane sugar factory mainly provides by burning bagasse and coal, and boiler flue is generally after water washing dedust, slagging-off are processed, directly discharged to atmosphere.N in these flue gases
2Content accounts for the 75%-80% of total release, CO
2Account for 7%-12%, O
2Account for 8%-12%, also have minute quantity NO and SO
2Deng.The flue gas total amount of sugar refinery discharging is large, instability of flow; CO
2Divide and force down, the content ordinary wave is moving; Contain a large amount of inert gases; Major impurity gas is O
2, NO, SO
2Deng, caused serious environmental pollution.Along with the concern of the whole world to greenhouse effects, CO
2Reduce discharging and day by day cause people's attention.Simultaneously, CO
2Being a kind of important carbon source and the deposit raw material of chemical products, also is the raw material that carbonatation process is produced white sugar, so CO
2Conversion and utilization be the problem that must pay attention to.The research and development new technology reduces CO
2Discharging and recycle imperative.
At present, domestic and international industrial separation is reclaimed carbon dioxide and is mainly contained dry method and wet method, and wherein wet method comprises solvent absorption, low temperature distillation method, membrane separation process and pressure swing adsorption method, has large, the reproducible characteristics for the treatment of capacity, and is multiplex in the high sulfur-containing gas desulfurization; Dry method is pressure swing adsorption method (PSA), is usually used in lean sulphurous gas and processes the particularly smart desulfurization of gas.Solvent absorption mainly is fit to process the lower source of the gas of carbon dioxide in gas content, and separating effect is better, usually can obtain 99.99% high concentration carbon dioxide gas, but investment cost is large, and energy consumption is high, and economy is relatively poor.The low temperature distillation method is applicable processes the higher source of the gas (carbon dioxide in gas content is greater than 60%) of carbon dioxide in gas content, but this technological equipment investment is large, and energy consumption is high, and separating effect is not good, this method of less employing; The technical process of membrane separation process is simple, easy to operate, advanced technology, low, the good economy performance of energy consumption, and investment only is half of solvent absorption, but the gas concentration lwevel that this method obtains is lower, is not suitable for industrialization.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method that can efficiently the separation of cane sugar factory carbon dioxide in flue gas, purification and enrichment, recovery concentration be reached the variable-frequency variable-voltage adsorption cleaning enrichment sugar refinery carbon dioxide in flue gas more than 98%.
The present invention solves the problems of the technologies described above with following technical scheme:
Processing step of the present invention is as follows:
(1) flue gas is through water scrubber dedusting, slagging-off;
(2) step (1) gained sugar refinery flue gas dehydrates through composite molecular screen deep dehydration process system;
(3) sensor is transferred to the relevant parameter of the dry flue gas pressure of step (2) gained and flow in the frequency converter of flue gas compressor; Frequency converter makes flow, pressure, rotating speed and the power parameter of compressor and the parameter matching of flue gas by the motor of regulating compressor, and dry flue gas enters surge tank after frequency conversion flue gas compressor compresses;
(4) at the uniform velocity enter pressure swing adsorption system by surge tank flue gas out from adsorption tower bottom, carry out pressure-variable adsorption and separate, purify, realize energy-conservation, efficiently, the carbon dioxide of high-purity safely and steadly.
Degree of depth essence dehydrates the composite molecular screen of use, is that its composition and mass ratio are 3A molecular sieve 45%-85% and 13X molecular sieve 55%-15% take the 3A zeolite as main combination drying adsorbent.
Make reduced water content in the flue gas of sugar refinery to 3mg/kg-10mg/kg behind the composite molecular screen deep dehydration.
The pressure at expulsion 0.6MPa of frequency conversion flue gas compressor～1.2MPa, 35 ℃～41 ℃ of delivery temperatures.
The output frequency of the frequency converter of frequency conversion flue gas compressor is 30Hz～130Hz, output voltage 140V～280V.
Frequency converter is high-performance vector-control frequency converter, voltage frequency converter, pulse width modulation frequency changing, U/f control frequency converter or slip frequency controlled frequency converter.
Method of the present invention has the following advantages:
1. the technological synthesis with the smart dehydration of composite molecular screen, variable-frequency variable-voltage absorption is applied to sugar refinery flue gas dehydration, decarburization; water in the flue gas and sour gas have not only been solved to equipment corrosion with because of the normal problem of producing of flue-gas flow rate de-stabilising effect; and Effective Raise flue gas separate and clean-up effect; realize green energy conservation, low-carbon emission reduction, safety and stability, obtain highly purified carbon dioxide efficiently, for the industrial sector of realizing sugar refinery flue gas, the development of integrated scale provide a kind of new model.
2. automatically regulate rotating speed and the power of compressor bank motor by frequency modulator, make it with dewater after flue gas pressure and flow be complementary, keep adsorption tower and under basicly stable operating mode, work;
3. owing to realized the high accuracy control of pressure and flow; be conducive to reduce the pressure loss that causes because of startup-shutdown; flowed fluctuation; with the frequent start-stop of minimizing flue gas compressor bank and the phenomenon that works long hours under inefficient operating mode; reduce simultaneously the vibration that relevant device produces; noise and electric current; the fluctuation of voltage; the flue gas compressor operates in the best effort scope all the time; follow-up pressure swing adsorption system is worked under basicly stable condition; even at low speed; also has good operating condition under the low-pressure ratio condition; improve energy utilization rate, be beneficial to final acquisition high-pureness carbon dioxide.
Description of drawings
Fig. 1 is the process chart of variable-frequency variable-voltage adsorption cleaning enrichment of the present invention sugar refinery carbon dioxide in flue gas method.
Among the figure: the 1-water scrubber 2-molecular sieve deep dehydration 3-of system pressure, flow sensor 4-frequency-changeable compressor 5-surge tank 6-pressure swing adsorption system
The specific embodiment
Sugar refinery flue gas gas flow is large, unstable, CO
2Minute force down and the content ordinary wave moving, contain a large amount of inert gases and foreign gas O
2, NO, SO
2Deng, directly discharging can cause serious environmental pollution.For reducing CO
2Discharging and make CO
2Obtain re-using, the applicant finds with the CO in the pressure swing adsorption method processing waste gas through long-time research
2Technical process is simple, and energy consumption is low, and corrodes little; Particularly when carbon dioxide content less than 50% the time, the PSA technology has economic advantages than other method.Frequency conversion and pressure swing adsorption are applied to reduce the discharging of sugar refinery carbon dioxide in flue gas and purify recycling simultaneously, and the recovery concentration of carbon dioxide can reach more than 98%, directly supplies industrial application.
Technical scheme of the present invention is that raising is improved on the basis of two other patent application " method of carbon dioxide in pressure-variable adsorption separation and the purifying biogas " (application number 201110295013.2) and " method of variable-frequency variable-voltage adsorbing separation and purifying biogas and carbon dioxide " (application number 201110385290.2) the applicant, proposition with the flue gas of sugar refinery discharging through water washing dedust, after the slagging-off, dry through the composite molecular screen deep dehydration again, remove as much as possible moisture and other foreign gas in the flue gas, reduce discharging and the pollution of sugar refinery flue gas, simultaneously the carbon dioxide in the flue gas is separated, purify and reclaim, improve the utilization ratio of the energy, realize further energy-conservation, the purpose of reduction of discharging and low-carbon (LC).
Technological process of the present invention is:
1. flue gas removes the gred through water scrubber 1 dedusting;
2. the flue gas after dedusting, the slagging-off is again through 2 dehydrations of composite molecular screen deep dehydration system; The composite molecular screen of deep dehydration Dryly use is that its composition and mass ratio are 3A molecular sieve 45%-85% and 13X molecular sieve 55%-15% take the 3A zeolite as main combination drying adsorbent; The deep dehydration drying makes reduced water content in the biogas to 3mg/kg-10mg/kg;
3. the dried sugar refinery of deep dehydration flue gas, the relevant parameter of its pressure and flow is transferred to the frequency converter of flue gas compressor by sensor 3, frequency converter is adjusted flow, pressure, rotating speed and the power parameter of compressor by the motor of regulating compressor, make and flue gas pressure and flow matches, guarantee the high-efficiency operation of compressor 4, improve the utilization ratio of the energy; Simultaneously, follow-up pressure swing adsorption system is worked under basicly stable operating mode; When flue gas is entered surge tank 5 by frequency conversion flue gas compressor compresses to 35 ℃～41 ℃ of 0.6MPa～1.2MPa, delivery temperature.
4. from surge tank dry flue gas out, enter pressure-swing absorber from the adsorption tower of pressure swing adsorption system 6 bottom evenly and carry out pressure-variable adsorption separation, purification and enriching and recovering carbon dioxide, realize green energy conservation, highly effective and safe, reduction of discharging low-carbon (LC), the stable desired gas of producing.
The output frequency of the frequency converter of frequency conversion flue gas compressor is 30Hz～130Hz, output voltage 140V～280V.Frequency converter is high-performance vector-control frequency converter, voltage frequency converter, pulse width modulation frequency changing, U/f control frequency converter or slip frequency controlled frequency converter.
To be 7% from sugar refinery flue carbonated out, pressure is that 0.9MPa～0.10Mpa, flow are 2800Nm
3The flue gas of/h is after water scrubber dedusting slagging-off, be the smart dewatering process of the composite molecular sieve system of 3A molecular sieve 65% and 13X molecular sieve 35% again through mass ratio, flue gas is carried out the deep dehydration drying, reduced water content in the flue gas is arrived less than 8.2mg/kg, again through frequency conversion flue gas compressor compresses to 0.6MPa, (before entering frequency conversion flue gas compressor, transfer to about 0.1MPa by pressure-regulating valve), by the sensor control that detects flue-gas flow rate and pressure, flow automatic regulation and pressure make it and dried flue gas pressure and the about 0.75m of flow
3/ s is complementary, 24.5 ℃ of the intake air temperature of frequency conversion flue gas compressor, pressure at expulsion 0.8MPa, 35 ℃ of delivery temperatures, enter again surge tank, then enter pressure swing adsorption system from the adsorption tower bottom evenly, carry out the carbon dioxide in pressure-variable adsorption separation, purification and the enriching and recovering flue gas.At last, the purity that obtains carbon dioxide is 98.5%.
Embodiment 2:
To be 10% from sugar refinery flue carbonated out, pressure is that 0.09MPa～0.11Mpa, flow are 3500Nm
3The flue gas of/h, remove the gred through the water scrubber dedusting, be the composite molecular sieve dewatering process system of 3A molecular sieve 85% and 13X molecular sieve 15% again through mass ratio, flue gas is carried out the deep dehydration drying, reduced water content in the flue gas is arrived less than 10.9mg/kg, again through frequency conversion flue gas compressor compresses to pressure at expulsion 0.9MPa, (before entering frequency conversion flue gas compressor, transfer to about 0.1MPa by pressure-regulating valve), frequency conversion flue gas compressor is regulated its flow and pressure automatically by the sensor control that detects flue-gas flow rate and pressure, makes it and dried flue gas pressure and the about 0.92m of flow
3/ s is complementary, 28.5 ℃ of the intake air temperature of frequency conversion flue gas compressor, pressure at expulsion 0.9MPa, 38 ℃ of delivery temperatures, enter again surge tank, then enter pressure swing adsorption system from the adsorption tower bottom evenly, carry out the carbon dioxide in pressure-variable adsorption separation, purification and the enriching and recovering flue gas.At last, the purity that obtains carbon dioxide is 98.9%.
Embodiment 3:
To be 12% from sugar refinery flue carbonated out, pressure is that 0.10MPa～0.12Mpa, flow are 5000Nm
3The flue gas of/h, remove the gred through the water scrubber dedusting, be the composite molecular sieve dewatering process system of 3A molecular sieve 45% and 13X molecular sieve 55% again through mass ratio, flue gas is carried out degree of depth essence to be dehydrated, reduced water content in the flue gas is arrived less than 3.1mg/kg, again through frequency conversion flue gas compressor compresses to 1.2MPa, (before entering frequency conversion flue gas compressor, transfer to about 0.1MPa by pressure-regulating valve), frequency conversion flue gas compressor is by the sensor control that detects flue-gas flow rate and pressure, automatically regulate its flow and pressure, make it and dried flue gas pressure and the about 1.50m of flow
3/ s is complementary, 8.2 ℃ of the intake air temperature of frequency conversion flue gas compressor, pressure at expulsion 1.2MPa, 41 ℃ of delivery temperatures, enter again surge tank, then enter pressure swing adsorption system from the adsorption tower bottom evenly, carry out the carbon dioxide in pressure-variable adsorption separation, purification and the enriching and recovering flue gas, at last, the purity that obtains carbon dioxide is 99.6%.
Claims (6)
1. the method for variable-frequency variable-voltage adsorption cleaning enrichment sugar refinery carbon dioxide in flue gas is characterized in that processing step is:
(1) flue gas is through water scrubber dedusting, slagging-off;
(2) step (1) gained sugar refinery flue gas dehydrates through composite molecular screen deep dehydration process system;
(3) sensor is transferred to the relevant parameter of the dry flue gas pressure of step (2) gained and flow in the frequency converter of flue gas compressor; Frequency converter makes flow, pressure, rotating speed and the power parameter of compressor and the parameter matching of flue gas by the motor of regulating compressor, and dry flue gas enters surge tank after frequency conversion flue gas compressor compresses;
(4) at the uniform velocity enter pressure swing adsorption system by surge tank flue gas out from adsorption tower bottom, carry out pressure-variable adsorption and separate, purify, realize energy-conservation, efficiently, the carbon dioxide of high-purity safely and steadly.
2. the method for variable-frequency variable-voltage adsorption cleaning enrichment as claimed in claim 1 sugar refinery carbon dioxide in flue gas, it is characterized in that degree of depth essence dehydrates the composite molecular screen of use, that its composition and mass ratio are 3A molecular sieve 45%-85% and 13X molecular sieve 55%-15% take the 3A zeolite as main combination drying adsorbent.
3. the method for variable-frequency variable-voltage adsorption cleaning enrichment as claimed in claim 1 sugar refinery carbon dioxide in flue gas is characterized in that making behind the composite molecular screen deep dehydration reduced water content in the flue gas of sugar refinery to 3mg/kg-10mg/kg.
4. the method for variable-frequency variable-voltage adsorption cleaning enrichment as claimed in claim 1 sugar refinery carbon dioxide in flue gas is characterized in that the pressure at expulsion 0.6MPa of frequency conversion flue gas compressor～1.2MPa, 35 ℃～41 ℃ of delivery temperatures.
5. the method for variable-frequency variable-voltage adsorption cleaning enrichment as claimed in claim 1 sugar refinery carbon dioxide in flue gas, the output frequency that it is characterized in that the frequency converter of frequency conversion flue gas compressor is 30Hz～130Hz, output voltage 140V～280V.
6. the method for variable-frequency variable-voltage adsorption cleaning enrichment as claimed in claim 1 sugar refinery carbon dioxide in flue gas is characterized in that frequency converter is high-performance vector-control frequency converter, voltage frequency converter, pulse width modulation frequency changing, U/f control frequency converter or slip frequency controlled frequency converter.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920365A (en) * | 2014-04-21 | 2014-07-16 | 广西大学 | Method for recycling nitrogen gas and sulfur dioxide from calcining iron pyrite burner gas through variable-voltage variable-frequency adsorption |
| CN106823702A (en) * | 2017-02-24 | 2017-06-13 | 苏州天蓝分析仪器有限公司 | A kind of gas drier and processing method with self-cleaning function |
| CN112919468A (en) * | 2021-03-10 | 2021-06-08 | 广西大学 | Method for recovering carbon dioxide by calcining limestone with oxygen-enriched combustion-supporting effect |
| CN114588754A (en) * | 2022-03-02 | 2022-06-07 | 深圳市安驰环保科技有限公司 | Device and method for capturing and compressing air carbon dioxide |
| CN116764381A (en) * | 2023-06-14 | 2023-09-19 | 临涣焦化股份有限公司 | CO trapping device for coke oven flue gas 2 Apparatus and method of (a) |
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| CN102391898A (en) * | 2011-10-08 | 2012-03-28 | 广西大学 | Method for separating and purifying carbon dioxide in marsh gas by adopting pressure swing adsorption |
| CN102585953A (en) * | 2012-03-09 | 2012-07-18 | 广西大学 | Efficient variable-frequency and variable-pressure adsorptive separation and purification method for methane and carbon dioxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920365A (en) * | 2014-04-21 | 2014-07-16 | 广西大学 | Method for recycling nitrogen gas and sulfur dioxide from calcining iron pyrite burner gas through variable-voltage variable-frequency adsorption |
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| CN112919468A (en) * | 2021-03-10 | 2021-06-08 | 广西大学 | Method for recovering carbon dioxide by calcining limestone with oxygen-enriched combustion-supporting effect |
| CN114588754A (en) * | 2022-03-02 | 2022-06-07 | 深圳市安驰环保科技有限公司 | Device and method for capturing and compressing air carbon dioxide |
| CN116764381A (en) * | 2023-06-14 | 2023-09-19 | 临涣焦化股份有限公司 | CO trapping device for coke oven flue gas 2 Apparatus and method of (a) |
| CN116764381B (en) * | 2023-06-14 | 2024-01-23 | 临涣焦化股份有限公司 | CO trapping device for coke oven flue gas 2 Apparatus and method of (a) |
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Application publication date: 20130116 |