CN102935329B - A kind of coal-fired boiler tail gas that recycles prepares the method and device of precipitated calcium carbonate - Google Patents
A kind of coal-fired boiler tail gas that recycles prepares the method and device of precipitated calcium carbonate Download PDFInfo
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- CN102935329B CN102935329B CN201210498159.1A CN201210498159A CN102935329B CN 102935329 B CN102935329 B CN 102935329B CN 201210498159 A CN201210498159 A CN 201210498159A CN 102935329 B CN102935329 B CN 102935329B
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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
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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
- Y02P20/50—Improvements relating to the production of bulk chemicals
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Abstract
The present invention relates to a kind of recycle the method that coal-fired boiler tail gas prepares precipitated calcium carbonate, comprise the following steps: coal and desulphurizer mixing are made desulfurized coal and puts into boiler combustion；Tail gas is carried out waste heat recovery processing；Tail gas is carried out dust removal process；Carry out tail gas assembling compression；Tail gas after compression is passed through retort and carries out chemical reaction；Prepare precipitated calcium carbonate.Coal-fired boiler tail gas can not only be processed by the method, reduces the pollution to environment, and can prepare precipitated calcium carbonate with the carbon dioxide in tail gas for raw material, has preferable application value and commercial value.The inventive system comprises be sequentially connected with waste-heat recovery device, dust arrester, compressor, retort, precipitated calcium carbonate recovery system; described waste-heat recovery device is connected with the air vent of coal-burning boiler; air inlet at boiler is provided with film filter; its simple in construction, fuel economy are high; low in the pollution of the environment; be conducive to the protection of environment, practical.
Description
Technical field
The invention belongs to stack gases recovery and reuse technology field, particularly relate to a kind of coal-fired boiler tail gas that recycles and prepare the method and device of precipitated calcium carbonate.
Background technology
Along with developing rapidly of global industry, the mankind's excessive exploitation to coal resources, a large amount of dust that coal produces during burning, sulfide, carbon dioxide etc. cause pollution greatly to environment, on the living environment of the mankind and healthy create serious impact.The coal of China 85% is directly burnt by coal-burning boiler use, mainly include thermal power generation, industry pot (kiln) stove, civil heating and household range etc., the coal burning mode of this high cost with low efficiency gives off substantial amounts of sulfur dioxide in air and flue dust pollution on the environment is the most serious, substantial amounts of CO2 emission becomes the principal element of Global Greenhouse Effect, and the exhaust emissions of coal-burning boiler has become as the main factor of China's atmospheric pollution.
For the environment protecting the mankind to depend on for existence; China has put into substantial amounts of manpower and materials and has renovated the tail gas of coal-burning boiler; but existing control and the main method reducing sulfur dioxide, carbon dioxide and dust are to be processed the sulfur dioxide in tail gas by dry or wet desulfurization technology; CO2 emission is reduced by improving the modes such as the efficiency of combustion of the combustion system of boiler, raising boiler; but aforesaid way still can produce substantial amounts of carbon dioxide, it is impossible to fundamentally solve a large amount of discharges and the problem of the pollution to environment of carbon dioxide.
Summary of the invention
The method that present invention aims to the deficiencies in the prior art and provide the recycling coal-fired boiler tail gas of a kind of discharge that can effectively reduce carbon dioxide to prepare precipitated calcium carbonate.
It is another object of the present invention to provide a kind of coal-fired boiler tail gas that recycles to prepare the device of precipitated calcium carbonate for the deficiencies in the prior art, its simple in construction, efficiency of combustion are high.
To achieve these goals, the present invention adopts the following technical scheme that.
A kind of recycle the method that coal-fired boiler tail gas prepares precipitated calcium carbonate, including following methods step:
Step (one): will the coal cinder that uses of coal-burning boiler pulverize after add desulfurizing agent, prepare desulfurized coal and put into boiler and burn.
Step (two): the tail gas after coal-fired boiler combustion is introduced waste-heat recovery device so that the heat energy in tail gas is also reclaimed by tail gas cooling.
Wherein, in described step (two), the temperature of the tail gas after cooling is 80～100 DEG C.
Step (three): the tail gas carried out after waste heat recovery is introduced dust arrester, the dust in tail gas is reclaimed；Dust is also a kind of serious air pollutants in boiler exhaust gas, the wherein particle diameter particulate matter less than or equal to 2.5 microns, also referred to as can enter very harmful to human body of lung particulate matter, PM2.5 index has become as the important indicator weighing air pollution degree, dust in boiler exhaust gas is carried out dust removal process, tail gas dust can be prevented effectively from and directly arrange to air, reduce the dust pollution to environment.Preferably, dust arrester can use sack cleaner, sack cleaner is also referred to as filtration dust catcher, it it is a kind of dry type high efficiency cleaner unit, the bag type filter elements that fibrous braid makes can be utilized to the solid particulate matter trapping in dusty gas, the particulate contaminants in boiler exhaust gas is retained down, carry out reclaiming thus avoid directly arranging to air tail gas dust, can effectively reduce the pollution to environment of the dust in boiler exhaust gas, reduce the discharge of the diameter subparticle less than PM2.5.
Step (four): the tail gas carried out after waste heat recovery is introduced compressor, tail gas is assembled and compresses.
Step (five): tail gas after compression is passed through the retort being contained with calcium hydroxide.
Step (six): the light calcium carbonate serosity in retort is sent into precipitated calcium carbonate recovery system, prepares precipitated calcium carbonate.
Wherein, in described step (), air inlet at boiler is provided with film filter, described film filter is oxygen permeable membrane defecator, and the membrance separation layer of described oxygen permeable membrane defecator enables to oxygen to be passed through, and stops nitrogen to pass through, therefore, the concentration of the oxygen entered in boiler, and then the effective efficiency of combustion improving coal can be improved, improve raw material availability.
Oxygen of the present invention is the infiltration gas of the low side outlets of the membrance separation layer of film filter, nitrogen be membrance separation layer high pressure side outlet ooze residual air.Oxygen, the separation process of nitrogen are in the case of pressure differential is as driving force, oxygen and nitrogen etc. penetrate into low-pressure side by dissolving resolving from the high-pressure side of membrance separation layer, owing to seepage velocity is different, the gas that seepage velocity is fast, as oxygen easily by, the gas that two seepage velocities are slow, as nitrogen is then retained down, thus reaches the purpose of oxygen Yu nitrogen separation.It is gaseous jet simulation industry by the procedure schema of the different types of mixed gas of differential separation dissolving resolving speed it is known that and wide variety of pattern.
Wherein, in described step (), desulfurizing agent is mixed by the raw material of following weight portion:
Subcarbonate 50～90 parts
Silicon dioxide
5～20 parts
Auxiliary agent
5～30 parts,
Wherein, described subcarbonate is at least one in basic copper carbonate or basic zinc carbonate, and described auxiliary agent is at least one in aluminium oxide or attapulgite clay powder.
Wherein, described desulfurizing agent is mixed by the raw material of following weight portion:
Subcarbonate 60～80 parts
Silicon dioxide
10～15 parts
Auxiliary agent
10～20 parts.
Wherein, described desulfurizing agent is mixed by the raw material of following weight portion:
Subcarbonate 70 parts
Silicon dioxide
12 parts
Auxiliary agent
18 parts.
The chemical principle of the present invention is:
1. preparing aqua calcis by interpolation quick lime in retort with water reaction, concrete reaction is as follows:
CaO+H2O=Ca(OH)2
(1)
2. precipitated calcium carbonate is prepared in the carbon dioxide in tail gas and aqua calcis reaction in retort, and concrete reaction is as follows:
Ca(OH) 2+ CO2===CaCO3↓+H2O (2)
Wherein, in described step (four), the force value of tail gas after compression is 1～2 normal atmosphere.After the boiler exhaust gas collected is pressurizeed, improve the air concentration in unit volume, after being passed through retort, be conducive to improving response speed, improve the efficiency of vent gas treatment.
In order to realize above-mentioned another object, the present invention adopts the following technical scheme that.
A kind of coal-fired boiler tail gas that recycles prepares the device of precipitated calcium carbonate, and including the waste-heat recovery device being sequentially connected with, dust arrester, compressor, retort, precipitated calcium carbonate recovery system, described waste-heat recovery device is connected with the air vent of coal-burning boiler.
Wherein, described retort includes that the first retort of two intermittent runnings, the second retort, described first retort, the second retort are set up in parallel.First retort, the second retort are set up in parallel, in the course of the work, two retort alternate turns are opened, while calcium hydroxide in first retort carries out follow-up operation by precipitated calcium carbonate recovery system after absorbing saturated carbon dioxide, open the second retort and the carbon dioxide in tail gas is carried out absorption process, two retort alternate turns reactions, it is possible to ensure being uninterruptedly carried out continuously boiler exhaust gas, improve efficiency.
Wherein, in described retort, it is provided with agitator.During absorbing carbon dioxide, constantly it is stirred, it is possible to increase response speed, improves efficiency.
Compared with prior art, there is advantages that
(1) method that the recycling coal-fired boiler tail gas of the present invention prepares precipitated calcium carbonate, desulfurizing agent was utilized to process before coal burning, common coal is replaced to burn, the sulfur contained in coal is made to precipitate in cinder after combustion, reduce the content of the harmful gass such as sulfur dioxide in boiler exhaust gas, effectively reduce the generation of acid rain etc., reduce the harm to environment.
(2) method that the recycling coal-fired boiler tail gas of the present invention prepares precipitated calcium carbonate, heat recovery substantial amounts of in coal-fired boiler tail gas can be prevented effectively from the waste of waste heat in tail gas, reduce the consumption to fuel sources such as coals by waste-heat recovery device.
(3) method that the recycling coal-fired boiler tail gas of the present invention prepares precipitated calcium carbonate, advanced membrane oxygen enrichment technology is utilized to be passed through oxygen-enriched air in the combustion process of boiler, the burning condition of fuel can be significantly improved, improve the efficiency of combustion of the fuel such as coal, guarantee the burning completely of the fuel such as coal, reducing the generation amount of carbon dioxide, dust etc., be substantially reduced discharge amount of exhaust gas and air pollution, energy-saving effect is notable.
(4) method that the recycling coal-fired boiler tail gas of the present invention prepares precipitated calcium carbonate, utilize film filter can by oxygen concentration and supply boiler use, the efficiency of combustion of coal can be improved, reduce the consumption of coal, reduce production cost low, there is preferable application value and huge commercial value.
(5) coal-fired boiler tail gas that recycles of the present invention prepares the device of precipitated calcium carbonate, simple in construction, and easy and simple to handle, production cost is low, and economic benefit is obvious, and the efficiency of combustion of coal is high, and waste gas discharge is few, low in the pollution of the environment, the beneficially protection of environment.
(6) present invention is on the basis of reducing waste gas discharge, it is possible to the carbon dioxide in waste gas carries out recycling, and prepares the by-product precipitated calcium carbonate with considerable economic benefit, turn waste into wealth, have preferable economic benefit and social benefit, practical.
(7) coal-fired boiler tail gas that recycles of the present invention prepares the device of precipitated calcium carbonate, and volume is little, floor space is little, simple installation, short construction period, reduced investment, operating cost low cost.
Accompanying drawing illustrates:
Fig. 1 is that the coal-fired boiler tail gas that recycles of the present invention prepares the structural representation of device of precipitated calcium carbonate.
Reference includes:
1 boiler；11 air vents；12 air inlets；2 waste-heat recovery devices；3 dust arresters；4 compressors；5 retort；51 first retort；52 second retort；
6 precipitated calcium carbonate recovery systems；7 film filters；8 agitators.
Detailed description of the invention:
For the ease of the understanding of those skilled in the art, below in conjunction with embodiment, the present invention is further illustrated with accompanying drawing, the content that embodiment is mentioned not limitation of the invention.
Embodiment
1
。
As it is shown in figure 1, the present invention's recycles the method that coal-fired boiler tail gas prepares precipitated calcium carbonate, comprise the following steps:
Step (one): the coal cinder that used by coal-burning boiler 1 adds desulfurizing agent after pulverizing, prepares desulfurized coal and puts into boiler 1 and burn；Before combustion coal is processed so that the sulphur-containing substance after boiler 1 burns is trapped in lime-ash, it is possible to the content of the sulfur dioxide in the effective tail gas reducing boiler 1 discharge, reduce the pollution to environment.
Further, air inlet 12 at boiler 1 is provided with film filter 7, described film filter 7 is oxygen permeable membrane defecator 7, the membrance separation layer of described oxygen permeable membrane defecator 7 enables to oxygen to be passed through, nitrogen is stoped to pass through, therefore, it is possible to improve the concentration of the oxygen entered in boiler 1, and then the effective efficiency of combustion improving coal, improve raw material availability.
The desulfurizing agent of the present embodiment is mixed by the raw material of following percentage by weight:
Basic copper carbonate 50 parts
Silicon dioxide
20 parts
Aluminium oxide
30 parts.
Step (two): the tail gas after being burnt by coal-burning boiler 1 introduces waste-heat recovery device 2 so that the heat energy in tail gas is also reclaimed by tail gas cooling；The temperature of the tail gas after boiler 1 burning is still within higher level, enter a large amount of wastes that can cause the energy in air, utilize waste-heat recovery device 2 that the heat in boiler 1 tail gas is reclaimed, the temperature making the tail gas after heat recovery is reduced to 100 DEG C, the utilization ratio of coal can be improved, reduce the consumption to the energy, reduce production cost.
Step (three): the tail gas carried out after waste heat recovery is introduced dust arrester 3, the dust in tail gas is reclaimed.Preferably, dust arrester 3 can use sack cleaner, sack cleaner is also referred to as filtration dust catcher, it it is a kind of dry type high efficiency cleaner unit, the bag type filter elements that fibrous braid makes can be utilized to the solid particulate matter trapping in dusty gas, the particulate contaminants in boiler exhaust gas is retained down, carry out reclaiming thus avoid directly arranging to air tail gas dust, can effectively reduce the pollution to environment of the dust in boiler exhaust gas, reduce the discharge of the diameter subparticle less than PM2.5.
Step (four): the tail gas carried out after waste heat recovery is introduced compressor 4, tail gas is assembled and compresses；Compressor 4 acts on of both playing, and one is to be gathered together by substantial amounts of boiler 1 tail gas, improves the gas concentration in unit volume, provides condition for follow-up recycling；Two is to be compressed the tail gas after collecting, it is simple to follow-up tail gas is passed through retort 5, completes the conversion to precipitated calcium carbonate.Further, the force value of tail gas after compression is 1 normal atmosphere, after pressurizeing the tail gas of boiler 1 collected, improves the air concentration in unit volume, is conducive to improving response speed, the efficiency of raising vent gas treatment being passed through retort 5 after.
Step (five): tail gas after compression is passed through the retort 5 being contained with calcium hydroxide；Described retort 5 is contained with aqua calcis, concrete, utilize quick lime to react with water to form, carbon dioxide is utilized easily to react the principle preparing precipitated calcium carbonate with aqua calcis, carbon dioxide in the tail gas of boiler 1 is adsorbed, while reducing carbon dioxide discharge, prepare the by-product precipitated calcium carbonate of non-secondary pollution, there is significant economic benefit.
Step (six): the light calcium carbonate serosity in retort 5 is sent into precipitated calcium carbonate recovery system 6, prepares precipitated calcium carbonate.Utilize precipitated calcium carbonate recovery system 6 that the light calcium carbonate serosity prepared in retort 5 is carried out dehydration to reclaim, prepare finished light calcium carbonate.
A kind of coal-burning boiler 1 tail gas that recycles prepares the device of precipitated calcium carbonate, and including the waste-heat recovery device 2 being sequentially connected with, compressor 4, retort 5, precipitated calcium carbonate recovery system 6, described waste-heat recovery device 2 is connected with the air vent 11 of coal-burning boiler 1.
Wherein, described retort 5 includes that first retort the 51, second retort 52 of two intermittent runnings, described first retort the 51, second retort 52 are set up in parallel.First retort the 51, second retort 52 is set up in parallel, in the course of the work, two retort 5 alternate turns are opened, while calcium hydroxide in first retort 51 carries out follow-up operation by precipitated calcium carbonate recovery system 6 after absorbing saturated carbon dioxide, open the second retort 52 to continue the carbon dioxide in tail gas is carried out absorption process, two retort 5 alternate turns reactions, it is possible to ensure uninterruptedly being carried out continuously of the tail gas to boiler 1, improve efficiency.
Embodiment
2
。
The present invention recycles the method that coal-burning boiler 1 tail gas prepares precipitated calcium carbonate, comprises the following steps:
Step (one): the coal cinder that used by coal-burning boiler 1 adds desulfurizing agent after pulverizing, prepares desulfurized coal and puts into boiler 1 and burn；Before combustion coal is processed so that the sulphur-containing substance after boiler 1 burns is trapped in lime-ash, it is possible to the content of the sulfur dioxide in the effective tail gas reducing boiler 1 discharge, reduce the pollution to environment.
Further, air inlet at boiler 1 is provided with film filter 7, described film filter 7 is oxygen permeable membrane defecator 7, the membrance separation layer of described oxygen permeable membrane defecator 7 enables to oxygen to be passed through, nitrogen is stoped to pass through, therefore, it is possible to improve the concentration of the oxygen entered in boiler 1, and then the effective efficiency of combustion improving coal, improve raw material availability.
The desulfurizing agent of the present embodiment is mixed by the raw material of following percentage by weight:
Basic zinc carbonate 90 parts
Silicon dioxide
5 parts
5 parts of attapulgite clay powder.
Step (two): the tail gas after being burnt by coal-burning boiler 1 introduces waste-heat recovery device 2 so that the heat energy in tail gas is also reclaimed by tail gas cooling；The temperature of the tail gas after boiler 1 burning is still within higher level, enter a large amount of wastes that can cause the energy in air, utilize waste-heat recovery device 2 that the heat in boiler 1 tail gas is reclaimed, the temperature making the tail gas after heat recovery is reduced to 80 DEG C, the utilization ratio of coal can be improved, reduce the consumption to the energy, reduce production cost.
The tail gas carried out after waste heat recovery is introduced dust arrester 3 by step (three), reclaims the dust in tail gas.Preferably, dust arrester 3 can use sack cleaner, sack cleaner is also referred to as filtration dust catcher, it it is a kind of dry type high efficiency cleaner unit, the bag type filter elements that fibrous braid makes can be utilized to the solid particulate matter trapping in dusty gas, the particulate contaminants in boiler exhaust gas is retained down, carry out reclaiming thus avoid directly arranging to air tail gas dust, can effectively reduce the pollution to environment of the dust in boiler exhaust gas, reduce the discharge of the diameter subparticle less than PM2.5.
Step (four): the tail gas carried out after waste heat recovery is introduced compressor 4, tail gas is assembled and compresses；Compressor 4 acts on of both playing, and one is to be gathered together by substantial amounts of boiler 1 tail gas, improves the gas concentration in unit volume, provides condition for follow-up recycling；Two is to be compressed the tail gas after collecting, it is simple to follow-up tail gas is passed through retort 5, completes the conversion to precipitated calcium carbonate.Further, the force value of tail gas after compression is 2 normal atmospheres, after pressurizeing boiler 1 tail gas collected, improves the air concentration in unit volume, is conducive to improving response speed after being passed through retort 5, improves the efficiency of vent gas treatment.
Step (five): tail gas after compression is passed through the retort 5 being contained with calcium hydroxide；Described retort 5 is contained with aqua calcis, concrete, utilize quick lime to react with water to form, carbon dioxide is utilized easily to react the principle preparing precipitated calcium carbonate with aqua calcis, carbon dioxide in boiler 1 tail gas is adsorbed, while reducing carbon dioxide discharge, prepare the by-product precipitated calcium carbonate of non-secondary pollution, there is significant economic benefit.
Step (six): the light calcium carbonate serosity in retort 5 is sent into precipitated calcium carbonate recovery system 6, prepares precipitated calcium carbonate.Utilize precipitated calcium carbonate recovery system 6 that the light calcium carbonate serosity prepared in retort 5 is carried out dehydration to reclaim, prepare finished light calcium carbonate.
A kind of coal-burning boiler 1 tail gas that recycles prepares the device of precipitated calcium carbonate, including the waste-heat recovery device 2 being sequentially connected with, dust arrester 3, compressor 4, retort 5, precipitated calcium carbonate recovery system 6, described waste-heat recovery device 2 is connected with the air vent 11 of coal-burning boiler 1.
Wherein, described retort 5 includes that first retort the 51, second retort 52 of two intermittent runnings, described first retort the 51, second retort 52 are set up in parallel.First retort the 51, second retort 52 is set up in parallel, in the course of the work, two retort 5 alternate turns are opened, while calcium hydroxide in first retort 51 carries out follow-up operation by precipitated calcium carbonate recovery system 6 after absorbing saturated carbon dioxide, open the second retort 52 and the carbon dioxide in tail gas is proceeded absorption process, two retort 5 alternate turns reactions, it is possible to ensure being uninterruptedly carried out continuously boiler 1 tail gas, improve efficiency.
Further, in described retort 5, it is provided with agitator 8.During absorbing carbon dioxide, constantly it is stirred, it is possible to increase response speed, improves efficiency.
Unaccounted technical characteristic in the present embodiment, uses the explanation in embodiment 1, no longer repeats at this.
Finally should be noted that; above example is merely to illustrate technical scheme rather than limiting the scope of the invention; although the present invention being explained in detail with reference to preferred embodiment; it will be understood by those within the art that; technical scheme can be modified or equivalent, without deviating from the spirit and scope of technical solution of the present invention.
Claims (2)
1. one kind recycles the method that coal-fired boiler tail gas prepares precipitated calcium carbonate, it is characterised in that include following methods step:
Step (one): will the coal cinder that uses of coal-burning boiler pulverize after add desulfurizing agent, prepare desulfurized coal and put into boiler and burn；Before combustion coal is processed so that the sulphur-containing substance after boiler combustion is trapped in lime-ash；
Air inlet at boiler is provided with film filter, and described film filter is oxygen permeable membrane defecator, and the membrance separation layer of described oxygen permeable membrane defecator enables to oxygen to be passed through, and stops nitrogen to pass through；
This desulfurizing agent is mixed by the raw material of following weight portion:
Basic copper carbonate
50 parts
Silicon dioxide
20 parts
Aluminium oxide
30 parts；
Step (two): the tail gas after coal-fired boiler combustion is introduced waste-heat recovery device, make tail gas cooling and the heat energy in tail gas is reclaimed, utilize waste-heat recovery device that the heat in boiler exhaust gas is reclaimed so that the temperature of the tail gas after heat recovery is reduced to 100 DEG C；
Step (three): the tail gas carried out after waste heat recovery being introduced dust arrester, reclaims the dust in tail gas, dust arrester uses sack cleaner；
Step (four): the tail gas carried out after waste heat recovery is introduced compressor, tail gas is assembled and compresses；Compressor one is to be gathered together by substantial amounts of boiler exhaust gas, improves the gas concentration in unit volume, provides condition for follow-up recycling；Two is to be compressed the tail gas after collecting, it is simple to follow-up tail gas being passed through retort, complete the conversion to precipitated calcium carbonate, the force value of tail gas after compression is 1 normal atmosphere；
Step (five): tail gas after compression is passed through the retort being contained with calcium hydroxide；Described retort is contained with aqua calcis；
Step (six): the light calcium carbonate serosity in retort is sent into precipitated calcium carbonate recovery system, prepares precipitated calcium carbonate；
Wherein, described in step (five), retort includes the first retort of two intermittent runnings, second retort, described first retort, second retort is set up in parallel, in the course of the work, two retort alternate turns are opened, while calcium hydroxide in first retort carries out follow-up operation by precipitated calcium carbonate recovery system after absorbing saturated carbon dioxide, open the second retort to continue the carbon dioxide in tail gas is carried out absorption process, two retort alternate turns reactions, ensure that uninterruptedly being carried out continuously of the tail gas to boiler, improve efficiency.
2. one kind recycles the method that coal-fired boiler tail gas prepares precipitated calcium carbonate, it is characterised in that include following methods step:
Step (one): will the coal cinder that uses of coal-burning boiler pulverize after add desulfurizing agent, prepare desulfurized coal and put into boiler and burn；Before combustion coal is processed so that the sulphur-containing substance after boiler combustion is trapped in lime-ash；
Air inlet at boiler is provided with film filter, and described film filter is oxygen permeable membrane defecator, and the membrance separation layer of described oxygen permeable membrane defecator enables to oxygen to be passed through, and stops nitrogen to pass through；
Described desulfurizing agent is mixed by the raw material of following weight portion:
Basic zinc carbonate
90 parts
Silicon dioxide
5 parts
5 parts of attapulgite clay powder；
Step (two): the tail gas after coal-fired boiler combustion is introduced waste-heat recovery device, make tail gas cooling and the heat energy in tail gas is reclaimed, utilize waste-heat recovery device that the heat in boiler exhaust gas is reclaimed so that the temperature of the tail gas after heat recovery is reduced to 80 DEG C；
The tail gas carried out after waste heat recovery is introduced dust arrester by step (three), reclaims the dust in tail gas, and dust arrester uses sack cleaner；
Step (four): the tail gas carried out after waste heat recovery is introduced compressor, tail gas is assembled and compresses；Compressor acts on of both playing, and one is to be gathered together by substantial amounts of boiler exhaust gas, improves the gas concentration in unit volume, provides condition for follow-up recycling；Two is to be compressed the tail gas after collecting, it is simple to follow-up tail gas being passed through retort, complete the conversion to precipitated calcium carbonate, the force value of tail gas after compression is 2 normal atmospheres；
Step (five): tail gas after compression is passed through the retort being contained with calcium hydroxide；Described retort is contained with aqua calcis；
Step (six): the light calcium carbonate serosity in retort is sent into precipitated calcium carbonate recovery system, prepares precipitated calcium carbonate；
Wherein, described in step (five), retort includes the first retort of two intermittent runnings, the second retort, described first retort, the second retort are set up in parallel, in the course of the work, two retort alternate turns are opened, while calcium hydroxide in first retort carries out follow-up operation by precipitated calcium carbonate recovery system after absorbing saturated carbon dioxide, open the second retort and the carbon dioxide in tail gas is proceeded absorption process, two retort alternate turns reactions, ensure that being uninterruptedly carried out continuously boiler exhaust gas, improve efficiency；It is provided with agitator in described retort.
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| CN103708521A (en) * | 2013-12-31 | 2014-04-09 | 上海东升新材料有限公司 | Method for preparing light calcium carbonate by using flue gas |
| CN104326498B (en) * | 2014-08-25 | 2017-01-18 | 凌庭生 | Device utilizing high-temperature flue gas with high CO2 content to produce ultrafine active calcium powder and production method thereof |
| CN108822339A (en) * | 2018-05-15 | 2018-11-16 | 谢鸿 | Exhaust combustion gases synthesize calcium base whisker composite reinforcing agent and preparation method thereof |
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| CN1085188A (en) * | 1992-09-29 | 1994-04-13 | 李维家 | Industrial smoke is used to produce light calcium carbonate and calcium chloride technology |
| CN101020579A (en) * | 2006-03-27 | 2007-08-22 | 中国人民解放军国防科学技术大学 | Process of preparing high purity light calcium carbonate fine powder with carbide residue |
| CN101327395A (en) * | 2008-05-16 | 2008-12-24 | 贡有成 | Sequencing batch limestone slurry wet desulfurization technique |
| JP2009297699A (en) * | 2008-06-16 | 2009-12-24 | Kiyoshi Motonaga | Carbon dioxide gas fixing removal system |
| CN101961594A (en) * | 2009-07-23 | 2011-02-02 | 昆山市精细化工研究所有限公司 | Desulfurizer |
| CN101967001A (en) * | 2010-09-26 | 2011-02-09 | 河北科技大学 | Method for producing calcium carbonate by using calcium carbide slag and low concentration carbon dioxide-containing waste gas as raw materials |
| CN102512920B (en) * | 2011-12-27 | 2014-05-07 | 广东大众农业科技股份有限公司 | Coal-fired boiler tail gas membrane filtration enriched oxygen recycling method and device |
| CN202427348U (en) * | 2012-01-12 | 2012-09-12 | 中钢设备有限公司 | System for removing carbon dioxide in smoke and preparing ammonium sulfate compound fertilizer and light calcium carbonate |
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2012
- 2012-11-29 CN CN201210498159.1A patent/CN102935329B/en active Active
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