CN105299672A - Total-recycling treatment method and system for smoke of gas-fired boiler - Google Patents
Total-recycling treatment method and system for smoke of gas-fired boiler Download PDFInfo
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- CN105299672A CN105299672A CN201510734786.4A CN201510734786A CN105299672A CN 105299672 A CN105299672 A CN 105299672A CN 201510734786 A CN201510734786 A CN 201510734786A CN 105299672 A CN105299672 A CN 105299672A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
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Abstract
The invention discloses a total-recycling treatment method and system for smoke of a gas-fired boiler. The smoke exhausting temperature of smoke of the gas-fired boiler drops firstly, condensate water is used for reducing the content of harmful gases, such as SOx and NOx in the smoke, and then a desulfurizer is used for removing residual SOx in the smoke; an alkanolamine solution is used for recycling CO2 in the smoke; residual NOx in the smoke is removed; and N2 is recycled. Zero emission of harmful substances such as SOx and NOx is achieved; in addition, carbon gathering and nitrogen recycling are achieved; and finally total-recycling treatment of the smoke is achieved. The total-recycling treatment method and device have the beneficial effects that energy conservation and environment friendliness are achieved, and pollution is reduced.
Description
Technical field
The present invention relates to energy-conserving and emission-cutting technology field, particularly relate to the full recovery and treatment method of a kind of gas fired-boiler flue gas and system.
Background technology
At present, along with expanding economy, carbon emission reduction becomes the problem of growing interest, the carbon emission reduction target that such as China promises to undertake: the coming five years China carbon discharge capacity intensity declines 16% ~ 17%, to the CO of the year two thousand twenty per GDP
2discharge intensity reduces 40% ~ 45% in level in 2005.And country very payes attention to CCUS (carbon is caught, utilize and seal up for safekeeping) technology and to research and develop for it and a series of activities has been carried out in demonstration.Therefore, the pressure of current carbon emission reduction is huge.
And natural gas is as clean energy resource, now increasing in industrial production, to replace the fuel oil that uses in the past and fire coal, reduce harmful substance to a certain extent, as SO
xand NO
xdischarge.But use natural gas as fuel, significantly can not reduce CO
2discharge.
Existing fume treatment technology is only to the SO in flue gas
xand NO
xprocess, as dry method, semidry method and wet desulphurization, and SNCR (SNCR method), SCR (selective recall reducing process) denitration, and not to the CO in flue gas
2carry out processing (that is: not realizing carbon emission reduction), cause CO in air
2content increase, add pollutant emission, larger pollution be also result in environment, thus harm ecological environment.
Summary of the invention
Invention provides the full recovery and treatment method of a kind of gas fired-boiler flue gas and system, to solve the technical problem that existing fume treatment technology cannot carry out carbon emission reduction.
For solving the problems of the technologies described above, the invention provides the full recovery and treatment method of a kind of gas fired-boiler flue gas, comprising the following steps:
S1, reduces the exhaust gas temperature of gas fired-boiler flue gas, makes the water vapor condensation in described flue gas, with the content utilizing condensed water to reduce the pernicious gas in described flue gas;
S2, sends the described flue gas after condensation cooling into desulfurizer and removes remaining SO in described flue gas
x;
S3, sends the described flue gas through desulfurization process into CO
2capturing device, utilizes alkanolamine solution to the CO in described flue gas
2carry out absorption and desorption, to the CO in described flue gas
2trap;
S4, will through CO
2described feeding denitrification apparatus after trapping carries out denitration, to remove remaining NO in described flue gas
x;
S5, to the N in the described flue gas after denitration process
2reclaim.
Preferably, after described S2, described method also comprises:
Flue gas cooling device is utilized to lower the temperature to described flue gas.
Preferably, at the described alkanolamine solution that utilizes to the CO in described flue gas
2before carrying out absorption and desorption, described method also comprises: utilize heater to make described alkanolamine solution reach desorption temperature.
Preferably, before described S4, described method also comprises: carry out drying process to the moisture in described flue gas.
The invention provides the full recovery and processing system of a kind of gas fired-boiler flue gas, comprise the gas fired-boiler, smoke condensation device, desulfurizer, the CO that connect successively
2capturing device, denitrification apparatus and N
2retracting device;
Wherein, described smoke condensation device, for reducing the exhaust gas temperature of gas fired-boiler flue gas, makes the water vapor condensation in described flue gas, with the content utilizing condensed water to reduce the pernicious gas in described flue gas;
Described desulfurizer, after sending into described desulfurizer at the described flue gas after condensation cooling, removes remaining SO in described flue gas
x;
Described CO
2capturing device, for utilizing alkanolamine solution by the CO in the described flue gas of desulfurization process
2carry out absorption and desorption, to the CO in described flue gas
2trap;
Described denitrification apparatus, for through CO
2described flue gas after trapping carries out denitration after sending into described denitrification apparatus, to remove remaining NO in described flue gas
x;
Described N
2retracting device, for the N in the described flue gas after denitration process
2reclaim.
Preferably, described CO
2capturing device is connected with heater, for heating described alkanolamine solution, makes described alkanolamine solution reach desorption temperature.
Preferably, described CO
2capturing device is connected with CO
2retracting device;
Described CO
2retracting device comprises the first pressurized gaseous retracting device or cooling pressurised liquid retracting device.
Preferably, described N
2retracting device is connected with the second pressurized gaseous retracting device or the liquid retracting device of cooling that expands.
Preferably, carry out denitration according to the first method of denitration, described denitrification apparatus is connected with NO
xcrystallizer,
Wherein, described first method of denitration is specially: NO
xfreezing and crystallizing+SCR denitration method; Or NO
xfreezing and crystallizing+SNCR denitration method;
Preferably, carry out denitration according to absorption absorption method of denitration, described denitrification apparatus is connected with NOx and absorbs adsorbent equipment.
By one or more technical scheme of the present invention, the present invention has following beneficial effect or advantage:
The invention provides the full recovery and treatment method of a kind of gas fired-boiler flue gas and system, first reduce the exhaust gas temperature of gas fired-boiler flue gas, in order to the content utilizing condensed water to reduce the pernicious gas in described flue gas, then desulfurizer removes remaining SO in described flue gas
x; Utilize alkanolamine solution to the CO in described flue gas
2reclaim; Remove remaining NO in described flue gas
x; To N
2reclaim.To realize SO
xand NO
xetc. the zero-emission of harmful substance, and realize carbon trapping and nitrogen recycling, finally realize flue gas and entirely recycle, there are energy-conserving and environment-protective and fall oligosaprobic advantage.
Accompanying drawing explanation
Fig. 1 is the full recovery and treatment method implementation process figure of a kind of gas fired-boiler flue gas in the embodiment of the present invention;
Fig. 2 is the structure chart of the full recovery and processing system of a kind of gas fired-boiler of embodiment of the present invention flue gas.
Description of reference numerals: gas fired-boiler 1, smoke condensation device 2, desulfurizer 3, flue gas cooling device 4, CO
2capturing device 5, flue gas drying dewater unit 6, denitrification apparatus 7, N
2retracting device 8, heater 9, CO
2the pressurized gaseous retracting device 11 of retracting device 10, first, cooling pressurised liquid retracting device 12, NO
xcrystallizer 13, NOx absorb adsorbent equipment 14, SCR treating apparatus 15, the pressurized gaseous retracting device 17 of SNCR treating apparatus 16, second, expand the liquid retracting device 18 of cooling.
Detailed description of the invention
The object of the present invention is to provide the full recovery and treatment method of a kind of gas fired-boiler flue gas and system, in order to realize SO
x(comprise SO, SO
2, SO
3) and NO
x(comprise NO
1, NO
2) etc. the zero-emission of harmful substance, realize carbon trapping and nitrogen recycling, finally realizing flue gas recycles entirely, has energy-conserving and environment-protective and falls oligosaprobic advantage.
In order to make the technical staff in the technical field of the invention more clearly understand the present invention, below in conjunction with accompanying drawing, by specific embodiment, technical solution of the present invention is described in detail.
Please refer to Fig. 1 below, is the implementation process figure of the full recovery and treatment method of gas fired-boiler flue gas provided by the invention.
S1, reduces the exhaust gas temperature of gas fired-boiler flue gas, makes the water vapor condensation in described flue gas, with the content utilizing condensed water to reduce the pernicious gas in described flue gas.
In implementation process of the present invention, the main purpose of S1 utilizes smoke condensation device to realize flue gas condensing, to reduce pernicious gas (the such as SO in flue gas
xand NO
xdeng) content.Specifically, in S1, smoke condensation device can utilize working medium to be heated or combustion air and flue gas to carry out heat exchange.In addition, the present invention can also recycle gas fired-boiler fume afterheat.After off-gas recovery, can by fume afterheat application in the present system, or utilize in other system, to realize the recycling to flue gas.
Utilizing after working medium to be heated or combustion air and flue gas carries out heat exchange, can exhaust gas temperature be reduced, the temperature of flue gas can be reduced under condensation point, making the water vapor condensation in flue gas, and utilizing condensed water to reduce SO in flue gas
xand NO
xdeng the content of pernicious gas.
Due to the high fume temperature of gas fired-boiler flue gas, generally more than 150 DEG C, because fuel all can produce a large amount of water vapours in burning.If be directly discharged in air by the flue gas of boiler, can thermal pollution be caused, thus harm ecological environment.Therefore, the present invention is when processing boiler smoke, first smoke condensation device is utilized to lower the temperature to flue gas, to reduce exhaust gas temperature, reduce flue gas loss, improve the thermal efficiency of boiler, and utilize after smoke condensation device realizes flue gas condensing, utilize condensed water can reduce pernicious gas (such as SO in flue gas
xand NO
xdeng) content, reduce the discharge of noxious pollutant, and can largely on alleviate thermal pollution to environment.
S2, sends the described flue gas after condensation cooling into desulfurizer and removes remaining SO in described flue gas
x.
Owing to having reduced SO in flue gas in S1
xand NO
xdeng the content of pernicious gas, therefore, object is herein the method using desulfurizer to use absorption and sorption or chemical reaction further, to remove remaining SO in flue gas
x.
It should be noted that the step of carbon trapping in the step of desulfurization in S2 of the present invention and S3 has sequencing, this order can not be changed.Its main cause is: owing to containing SO in pernicious gas
x, NO
x, CO
2etc. pernicious gas.And the SO in pernicious gas
xto CO
2trapping (catch, collect) there is impact.Therefore, need at trapping CO
2before to the SO in pernicious gas
xremove, avoid SO
xaffect CO
2trapping purity.And the NO in pernicious gas
xto CO
2trapping be do not have influential, therefore, denitrification step and carbon trapping step not order restriction.
In addition, in order to improve CO further
2trapping purity, in a kind of possible embodiment, at flue gas after desulfurization process, if flue-gas temperature does not drop to CO
2the temperature of trapping, then need flue gas cooling device (as cooling tower) further to lower the temperature to flue gas.
S3, sends the described flue gas through desulfurization process into CO
2capturing device, utilizes alkanolamine solution to the CO in described flue gas
2carry out absorption and desorption, by the CO in described flue gas
2trap.To obtain highly purified CO
2.
In a kind of possible embodiment, at CO
2in desorption process, also need heater, make alkanolamine solution reach desorption temperature.In addition, when to CO
2after carrying out absorption and desorption, also can to the CO separating sucking-off
2reclaim, reduce carbon emission amount, avoid CO as far as possible
2be discharged in air, to alleviate the pollutant emission in air.
S4, will through CO
2described feeding denitrification apparatus after trapping carries out denitration, to remove described remaining NO
x.
And before denitration, also can carry out drying process to the moisture in flue gas.
In the process of denitration, will through CO
2after flue gas after trapping sends into denitrification apparatus, can have various ways denitration, such as conventional utilize SCR method or SNCR method carry out denitration.In addition, the present invention still further developed the distinctive method of denitration of the present invention, such as: NO
xfreezing and crystallizing+SCR (or SNCR) method; Or absorption absorption+SCR (or SNCR) method carries out denitration, to remove remaining NO in flue gas
x.
Specifically, at NO
xin freezing and crystallizing+SCR (or SNCR) method, then flue gas is in denitrification process, and denitrification apparatus is connected with NO
xcrystallizer, after utilizing the principle of gas solid separation to be separated by N2 with NOx, then the NO to crystallization
xsCR or SNCR method is adopted to carry out denitration process.When this denitration mode is compared with conventional method of denitration (SCR method or SNCR method), owing to first utilizing the principle of gas solid separation by N
2and NO
xbe separated, can N be made
2(gas) is thoroughly separated with NOx (crystallization), then the NO to crystallization
xdenitration, thus can NO be avoided
xbe that gaseous state disperses everywhere when denitration, the removal efficiency of denitration can be improved, remove the NO in pernicious gas as much as possible
x.
When absorbing absorption+SCR (or SNCR) method and carrying out denitration, then flue gas is in denitrification process, and described denitrification apparatus is connected with NO
xabsorb adsorbent equipment, utilize the principle of physical absorption and chemical neutralization reaction by the NO in flue gas
xremove, then to absorbing the NO of absorption
xsCR or SNCR method is adopted to carry out denitration process.When this denitration mode is compared with conventional method of denitration, owing to first utilizing the principle of physical absorption and chemical neutralization reaction by the NO in flue gas
xremove, and then use the further denitration of SCR or SNCR method, therefore can improve the removal efficiency of denitration, remove the NO in pernicious gas as much as possible
x.
S5, to the N in the described flue gas after denitration process
2reclaim.
Flue gas after denitration process, wherein N
2content 95%, can directly to N
2reclaim.And reclaim N
2main purpose be also the pollutant emission alleviated in air, and then finally realize flue gas and entirely recycle.
The invention provides the full recovery and treatment method of a kind of gas fired-boiler flue gas, first reduce the exhaust gas temperature of gas fired-boiler flue gas, utilize condensed water to reduce pernicious gas (such as SO in described flue gas
x, NO
x) content, then desulfurizer removes remaining SO in described flue gas
x; Recycling alkanolamine solution is to the CO in described flue gas
2reclaim; Remove remaining NO in described flue gas again
x; Finally to N
2reclaim, to realize SO
xand NO
xetc. the zero-emission of harmful substance, and realize carbon trapping and nitrogen recycling, finally realize flue gas and entirely recycle, in addition, due to SO remaining in flue gas
xto CO
2recovery tool have a certain impact, therefore first can remove remaining SO in described flue gas
x; Recycling alkanolamine solution is to the CO in described flue gas
2reclaim, to improve CO
2the purity reclaimed.
Based on same invention and design, an alternative embodiment of the invention provides the full recovery and processing system of a kind of gas fired-boiler flue gas.
Specifically please refer to Fig. 2, system provided by the invention specifically comprises the gas fired-boiler 1, smoke condensation device 2, desulfurizer 3, flue gas cooling device 4, CO2 capturing device 5, flue gas drying dewater unit 6, denitrification apparatus 7 and the N that connect successively
2retracting device 8.
Wherein, described smoke condensation device 2, for reducing the exhaust gas temperature of gas fired-boiler 1 flue gas, makes the water vapor condensation in described flue gas, with the content utilizing condensed water to reduce the pernicious gas in described flue gas;
Described desulfurizer 3, after sending into described desulfurizer 3 at the described flue gas after condensation cooling, removes remaining SO in described flue gas
x;
Flue gas cooling device 4, for remaining SO in the described flue gas of removing
xafterwards, described flue gas is lowered the temperature.
Described CO
2capturing device 5, for utilizing alkanolamine solution by the CO in the described flue gas of desulfurization process
2carry out absorption and desorption, to the CO in described flue gas
2trap.
Preferably, described CO
2capturing device 5 is connected with heater 9, at CO
2in desorption process, alkanolamine solution is heated.
Preferably, described CO
2capturing device 5 is connected with CO
2retracting device 10; Described CO
2retracting device 10 comprises the first pressurized gaseous retracting device 11 or cooling pressurised liquid retracting device 12.First pressurized gaseous retracting device 11 is for CO
2pressurize, make CO
2reclaim with gaseous state.Cooling pressurised liquid retracting device 12 is for CO
2lower the temperature, make CO
2become liquid state to reclaim.
Flue gas drying dewater unit 6, for remaining NO in the described flue gas of removing
xbefore, drying process is carried out to the moisture in described flue gas.
Described denitrification apparatus 7, for through CO
2described flue gas after trapping carries out denitration, to remove remaining NO in described flue gas after sending into described denitrification apparatus 7
x.
In the process of denitration, will through CO
2after flue gas after trapping sends into denitrification apparatus, various ways denitration can be had.Such as: denitrification apparatus 7 is connected with SCR treating apparatus 15, SCR method can be utilized to carry out denitration.Again such as: denitrification apparatus 7 is connected with SNCR treating apparatus 16, SNCR method can be utilized to carry out denitration.
In concrete implementation process, according to the first method of denitration, (described first method of denitration is specially: NO
xfreezing and crystallizing+SCR denitration method; Or NO
xfreezing and crystallizing+SNCR denitration method) carry out denitration, then in the expansion temperature-fall period of flue gas in denitrification process, described denitrification apparatus 7 is connected with
NO
xcrystallizer 13, utilizes the principle of gas solid separation by N
2and NO
xafter separation, then SCR or SNCR method is adopted to carry out denitration process to the NOx of crystallization.
In another implementation process, carry out denitration according to absorption absorption method of denitration, then flue gas is in denitrification process, and described denitrification apparatus 7 is connected with NO
xabsorb adsorbent equipment 14, utilize the principle of physical absorption and chemical neutralization reaction by the NO in flue gas
xremove, then to absorbing the NO of absorption
xsCR or SNCR method is adopted to carry out denitration process.
Described N
2retracting device 8, for the N in the described flue gas after denitration process
2reclaim.
Preferably, described N
2retracting device 8 is connected with the second pressurized gaseous retracting device 17 or the liquid retracting device 18 of cooling that expands.The Main Function of the second pressurized gaseous retracting device 17 is to N
2pressurize, make N
2reclaim with gaseous state.The Main Function of the liquid retracting device 18 of expansion cooling is to N
2carry out expansion cooling, make N
2become liquid state to reclaim.
By one or more embodiment of the present invention, the present invention has following beneficial effect or advantage:
The invention provides the full recovery and treatment method of a kind of gas fired-boiler flue gas and system, first reduce the exhaust gas temperature of gas fired-boiler flue gas, utilize condensed water to reduce pernicious gas (such as SO in described flue gas
x, NO
x) content, then desulfurizer removes remaining SO in described flue gas
x; Utilize alkanolamine solution to the CO in described flue gas
2reclaim; Remove remaining NO in described flue gas
x; To N
2reclaim.To realize SOx and NO
xetc. the zero-emission of harmful substance, and realize carbon trapping and nitrogen recycling, finally realize flue gas and entirely recycle, there are energy-conserving and environment-protective and fall oligosaprobic advantage.
Although describe the preferred embodiments of the present invention, one of ordinary skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. the full recovery and treatment method of gas fired-boiler flue gas, is characterized in that, comprise the following steps:
S1, reduces the exhaust gas temperature of gas fired-boiler flue gas, makes the water vapor condensation in described flue gas, with the content utilizing condensed water to reduce the pernicious gas in described flue gas;
S2, sends the described flue gas after condensation cooling into desulfurizer and removes remaining SO in described flue gas
x;
S3, sends the described flue gas through desulfurization process into CO
2capturing device, utilizes alkanolamine solution to the CO in described flue gas
2carry out absorption and desorption, to the CO in described flue gas
2trap;
S4, will through CO
2described feeding denitrification apparatus after trapping carries out denitration, to remove remaining NO in described flue gas
x;
S5, to the N in the described flue gas after denitration process
2reclaim.
2. the full recovery and treatment method of gas fired-boiler flue gas according to claim 1, is characterized in that, after described S2, described method also comprises:
Flue gas cooling device is utilized to lower the temperature to described flue gas.
3. the full recovery and treatment method of gas fired-boiler flue gas according to claim 1, is characterized in that, at the described alkanolamine solution that utilizes to the CO in described flue gas
2before carrying out absorption and desorption, described method also comprises: utilize heater to make described alkanolamine solution reach desorption temperature.
4. according to the full recovery and treatment method of gas fired-boiler flue gas according to claim 1, it is characterized in that, before described S4, described method also comprises: carry out drying process to the moisture in described flue gas.
5. the full recovery and processing system of gas fired-boiler flue gas, is characterized in that, comprises the gas fired-boiler, smoke condensation device, desulfurizer, the CO that connect successively
2capturing device, denitrification apparatus and N
2retracting device;
Wherein, described smoke condensation device, for reducing the exhaust gas temperature of gas fired-boiler flue gas, makes the water vapor condensation in described flue gas, with the content utilizing condensed water to reduce the pernicious gas in described flue gas;
Described desulfurizer, after sending into described desulfurizer at the described flue gas after condensation cooling, removes remaining SO in described flue gas
x;
Described CO
2capturing device, for utilizing alkanolamine solution by the CO in the described flue gas of desulfurization process
2carry out absorption and desorption, to the CO in described flue gas
2trap;
Described denitrification apparatus, for through CO
2described flue gas after trapping carries out denitration after sending into described denitrification apparatus, to remove remaining NO in described flue gas
x;
Described N
2retracting device, for the N in the described flue gas after denitration process
2reclaim.
6. the full recovery and processing system of gas fired-boiler flue gas according to claim 5, is characterized in that, described CO
2capturing device is connected with heater, for heating described alkanolamine solution, makes described alkanolamine solution reach desorption temperature.
7. the full recovery and processing system of gas fired-boiler flue gas according to claim 5, is characterized in that,
Described CO
2capturing device is connected with CO
2retracting device;
Described CO
2retracting device comprises the first pressurized gaseous retracting device or cooling pressurised liquid retracting device.
8. the full recovery and processing system of gas fired-boiler flue gas according to claim 5, is characterized in that,
Described N
2retracting device is connected with the second pressurized gaseous retracting device or the liquid retracting device of cooling that expands.
9. the full recovery and processing system of gas fired-boiler flue gas according to claim 5, is characterized in that, carry out denitration according to the first method of denitration, described denitrification apparatus is connected with NO
xcrystallizer,
Wherein, described first method of denitration is specially: NO
xfreezing and crystallizing+SNCR method SCR denitration method; Or NO
xfreezing and crystallizing+selective recall reducing process SNCR denitration method.
10. the full recovery and processing system of gas fired-boiler flue gas according to claim 5, is characterized in that, carry out denitration according to absorption absorption method of denitration, described denitrification apparatus is connected with NO
xabsorb adsorbent equipment.
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| CN115745741A (en) * | 2022-11-16 | 2023-03-07 | 山东大学 | Coupling system and process for synthesizing methanol by propane dehydrogenation and carbon dioxide hydrogenation |
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| CN108970358A (en) * | 2018-07-27 | 2018-12-11 | 邵金容 | A kind of thermal power station's Industrial Boiler off-gas recovery processing unit and processing method |
| CN115745741A (en) * | 2022-11-16 | 2023-03-07 | 山东大学 | Coupling system and process for synthesizing methanol by propane dehydrogenation and carbon dioxide hydrogenation |
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