CN102512920B - Coal-fired boiler tail gas membrane filtration enriched oxygen recycling method and device - Google Patents
Coal-fired boiler tail gas membrane filtration enriched oxygen recycling method and device Download PDFInfo
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- CN102512920B CN102512920B CN201110444308.1A CN201110444308A CN102512920B CN 102512920 B CN102512920 B CN 102512920B CN 201110444308 A CN201110444308 A CN 201110444308A CN 102512920 B CN102512920 B CN 102512920B
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Abstract
The invention relates to the technical field of tail gas recovery, in particular to a coal-fired boiler tail gas membrane filtration enriched oxygen recycling method and a coal-fired boiler tail gas membrane filtration enriched oxygen recycling device. The recycling method comprises the following steps: mixing coal and a desulfurizer to obtain desulfurized coal, feeding the desulfurized coal into a boiler and burning the desulfurized coal; recovering afterheat from the tail gas; layering the tail gas in a pressure regulating device; recovering the layered gas by a recovering device; absorbing the mixed tail gas by an absorbing device; and circulating the tail gas to the boiler to be burnt again, and introducing the afterheat and oxygen passing through the membrane filtering device into the coal-fired boiler for burning. The recycling device comprises a tail gas afterheat recovering device, a pressure regulating device and an absorbing device, which are connected in turn, wherein the pressure regulating device is connected with the recovering device; and the air outlet of the tail gas afterheat recovering device is provided with the membrane filtering device. The method and the device have the advantages of circularly burning all tail gas, preventing pollution by waste gas, avoiding producing particulate matter 2.5 (PM2.5), reducing environment pollution, along with low cost, simple process, high fuel burning efficiency and small fuel consumption.
Description
Technical field
The present invention relates to tail gas recycle technical field, particularly a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling method and device.
Background technology
Along with social development, the improving constantly of living standards of the people, city size constantly increases, and energy consumption is also increasing, and the disposable energy is day by day exhausted simultaneously, and the imbalance between supply and demand of the energy becomes increasingly conspicuous.For sustainable development, country also more and more payes attention to energy-saving and emission-reduction.
Owing to containing sulphur in coal, in the tail gas that therefore medium and small coal-fired boiler combustion produces, be mingled with a large amount of sulfur dioxide (SO
2) etc. pernicious gas, be accompanied by the discharge of coal-fired boiler tail gas, surrounding enviroment and atmosphere have been brought to serious pollution.Known coal-fired boiler tail gas is processed and is adopted dry method or wet desulphurization denitration technology, and dry desulfurization rate is in 85% left and right, and wet desulphurization rate is in 90% left and right, and some thermal power plants are in order to make the SO of exhaust emissions
2and NO
xmain pollutant consistence does not exceed standard, and does not stint the air inducing amount of air-introduced machine of strengthening, and does not only reduce SO
2total emission volumn, and cause enriched-oxygen in tail gas, coal is insufficient because burning, and contains 8-10% unburned coal, and increased air preheat cost in slag, forms the new problems such as the wasting of resources, the carbon dioxide (CO that burning is produced simultaneously
2) all enter in air, be the principal element that causes Global Greenhouse Effect, existing control and reduction of discharging CO
2main method be to improve boiler combustion mode, improve boiler combustion efficiency and adopt the technology such as washed coal, coal gasification, cannot fundamentally solve CO
2a large amount of emission problems.
At present, low-temperature distillation process technology is the mainstream technology in industrial air separation market, in extensive air separation field, there is lower separated operating cost and higher product purity, and, the prior feature of this technology is that the method can be taken into account even argon gas product of oxygen product and nitrogen product simultaneously, forms a kind of production capacity of installing multiple product.But for the on-the-spot air feed of the specific environments such as the air separation of medium and smallization, portable outfit, this product requirement is little, its flexibility is low, investment is large, energy consumption is high, automaticity is low, complicated operation, uses inconvenient.
In addition, the coal-fired boiler tail gas of prior art with heat energy all discharged to atmosphere, there is not recycling.Low temperature heat energies a large amount of in tail gas are discharged from vain, cause waste and pollute, and increase the consumption of the fuel such as coal.
Summary of the invention
The object of the invention is provides for the deficiencies in the prior art the coal-fired boiler tail gas membrane filtration enriched oxygen recycling method that a kind of cost is low, technique is simple, fuel economy is high, fuel consumption is few, low in the pollution of the environment.
Another object of the present invention is to provide the coal-fired boiler tail gas membrane filtration enriched oxygen that a kind of cost is low, simple to operate, fuel economy is high, fuel consumption is few, low in the pollution of the environment recycling device for the deficiencies in the prior art.
For achieving the above object, the present invention adopts following technical scheme.
A kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling method is provided, comprises the following steps:
Steps A, the coal that boiler combustion is used and desulphurizer mixing are made desulfurized coal, desulfurized coal is dropped into boiler air inlet and burn; Boiler combustion desulfurized coal, is trapped in lime-ash the sulphur-containing substance generating, and greatly reduces the content of discharged from coal-fired boiler sulfur dioxide in tail gas, reduces environmental pollution, solves the coal-fired clean problem of using.
Step B, the tail gas that coal-burning boiler is discharged are concentrated and are carried out waste heat recovery processing, make tail gas cooling; Further, the exhaust temperature after cooling is 20～50 ℃, and exhaust temperature reduces, and is conducive to pressurization layering and the absorption of follow-up mist.
Step C, by above-mentioned tail gas by pressure-regulating device, utilize specific gravity of gas difference to make the stratification of hot gas in tail gas; CO in the tail gas of discharging after boiler combustion desulfurized coal
2and N
2by the pressure-regulating device layering of pressurizeing, due to CO
2the molecular weight ratio N of gas
2the molecular weight of gas is large, CO after pressurization
2gas is in lower floor, and N
2gas is positioned at upper strata, by physical layering, is conducive to gas and reclaims and use.As the CO reclaiming
2gas can be alkali-making process and supplies raw materials, and reduces CO
2gas emissions, low in the pollution of the environment.Further, pressure-regulating device has antiseptic effect.
Step D, by the gas after layering by retracting device, reclaim, obtain carbon dioxide.
Step e, make to reclaim after remaining mixed tail gas by adsorbent equipment, adsorb; In mixed tail gas, contain micro-SO
2with a small amount of CO
2mixed tail gas, utilize adsorbent equipment by SO
2and CO
2adsorb.Further, in adsorbent equipment, be provided with chemosorbent, as calcium hydroxide or methyldiethanolamine solution, be conducive to sulfur dioxide and carbon dioxide fully to adsorb, and generate the calcium sulfate of non-secondary pollution and calcium carbonate etc., reduce harmful gas emission.
Step F, the first air inlet that remaining circulation of tail gas in step e is introduced to boiler carry out second-time burning, at the second air inlet of boiler, film filter are set, will be by the oxygen O of film filter
2introduce burning in coal-burning boiler.Circulation of tail gas burning, without exhaust emission, low in the pollution of the environment, in addition, utilize film filter to improve and enter the O in boiler
2concentration, O particularly
2concentration is 24%, effectively improves burning of coal efficiency, improves raw material availability.
Oxygen of the present invention is the infiltration gas of film separating layer low-pressure side outlet, and nitrogen is the residual air of oozing of film separating layer high-pressure side outlet.The separation process of nitrogen oxygen be pressure differential as driving force situation under, oxygen and nitrogen etc. are penetrated into low-pressure side by dissolving-resolving from the high-pressure side of film separating layer, because seepage velocity is different, the gas that seepage velocity is fast, as oxygen easily passes through, and the slow gas of seepage velocity as nitrogen is retained down, thereby reaches separated object.Procedure schema by the separated variety classes mist of dissolving-resolving speed difference is the well-known also pattern of extensive use of gas film separation industries.
Wherein, in described steps A, desulfurizing agent is become by the mixed raw material of following percentage by weight:
Calcium hydroxide Ca (OH)
275～80%
The cinder producing after coal combustion or tripoli ore deposit 10～15%
Sodium carbonate Na
2 cO
35%
Amino acid surplus.
The cinder producing after coal combustion, is alkalescence, has certain calorie, and the cinder after just burning is as SO
2adsorbent, can carry out secondary utilization, and completing combustion, effectively reduce the tail gas of coal-burning boiler and discharge SO
2gas; After amino acid sodium fermentation, play a part bondingly, what make that coal and desulfurizing agent can be stable is bonding, thereby plays desulfurized effect, avoids discharging in coal-fired boiler combustion process a large amount of SO
2pernicious gas.In addition, sulphur-fixing agent can not reduce the caloric value of coal in desulfurization reaction process, has solved because affecting coal-fired thermal efficiency problem adding of sulphur-fixing agent.
Sulphur-fixing agent of the present invention, except being that the raw material of above-mentioned percentage by weight is made, can be also other compound sulphur-fixing agent, as by compound carbonate 1-10 part, and calcium carbonate 2-12 part, calcium oxide 1-6 part, the raw material of the weight portion proportioning of magnesium carbonate 0.5-3 part is made; Can also be to adopt of the prior art other effectively to consolidate the coal composite sulfur fixing agent of sulphur, as amounted to 1-5 part by agstone 70-90 part, bauxite 5-25 part, potassic feldspar and green stone, wherein the weight ratio of potassic feldspar and green stone be 1:0.5-1:2.
Wherein, after described step B, also include step B1, the tail gas after cooling is carried out to tail gas dust recovery by dust arrester.Dust arrester can be sack cleaner, and sack cleaner, also referred to as filtration dust catcher, is a kind of dry type high efficiency deduster, and it is to utilize bag type filtering element that fiber fabric is made to trap the dust arrester of solid particulate matter in dusty gas.Its action principle be grit when walking around fiber cloth because the collision of inertia force effect and fiber is blocked.The tail gas producing due to coal-burning boiler constantly recycles, circulation of tail gas burning can produce dust, utilize sack cleaner the dust in tail gas can be tackled and reclaimed, avoid tail gas dust directly discharged to atmosphere, effectively reduce dust in tail gas and, to contaminated environment, guarantee that the tail gas after burning does not produce diameter lower than the subparticle of PM2.5.
PM2.5 refers to that in atmosphere, diameter is less than or equal to the particle of 2.5 microns, also referred to as entering lung particle.PM2.5 particle diameter is little, is rich in a large amount of poisonous and harmful substances and the time of staying in atmosphere is long, fed distance is far away, thereby very large on the impact of health and atmosphere quality.PM2.5 index has become the index of an important observing and controlling air pollution degree.PM, English full name is particulate matter (particle).Scientist represents the content of this particle in every cubic metres of air with PM2.5, this value is higher, just represents that air pollution is more serious.
Wherein, in described step C, the force value of pressure-regulating device is 1～2 standard atmospheric pressure.Due to implication CO in mist
2and N
2, utilize pressure dispensing device a little pressure can make the CO that molecular weight is larger
2sink, and make N
2gas is positioned at upper strata, simple to operate.
Wherein, in described step D, described retracting device comprises buffering gas tank and conduit, by the carbon dioxide CO in lower floor after layering
2, and the nitrogen N in upper strata after layering
2gas, reclaims with buffering gas tank respectively.
Wherein, the film filter in described step F is oxygen permeable membrane filter, and described oxygen permeable membrane filter can make oxygen O
2by film separating layer, and nitrogen N
2tunicle separating layer stops, improves the O in coal-burning boiler
2concentration, improves burning of coal utilization rate.
For realizing above-mentioned another object, the present invention adopts following technical scheme.
A kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling device is provided, comprise the exhaust waste heat recovery device, pressure-regulating device, the adsorbent equipment that are connected with the chimney of coal-burning boiler that connect successively, described pressure-regulating device is connected with retracting device, and the gas outlet of described exhaust waste heat recovery device is provided with film filter.
Wherein, described waste-heat recovery device comprises heating pipe, the ventilation duct being communicated with the chimney of coal-burning boiler and the heat-exchange tube that is built-in with heat-conducting medium, the tube wall of described ventilation duct and the tube wall of described heating pipe fit, described heat-exchange tube is inserted in the tube wall joint place of described ventilation duct and heating pipe, the inner chamber of described heating pipe and the inner chamber of described ventilation duct are stretched into respectively in the two ends of described heat-exchange tube, the air inlet of described ventilation duct is provided with extractor fan, and the gas outlet of described ventilation duct is communicated with the second air inlet of described coal-burning boiler.
Heat-exchange tube is to be pumped into after certain vacuum by steel, copper aluminum pipe, and filling heat-conducting medium is sealed to form, and has extraordinary heat activity and heat sensitivity, and heat and inhaling is met cold and puts.During use, the high-temperature tail gas that coal-burning boiler produces activates the heat-conducting medium being placed in the heat-exchange tube of lower end of heating pipe vaporization rapidly, heat-conducting medium becomes steam state by liquid state, and with molecule concussion phase deformation type, subsonic speed transferring heat, to the heat-exchange tube place heat release that is placed on the upper end of ventilation duct, extractor fan is pumped air the heat-exchange tube heat release of accelerating upper end into ventilation duct, and heat exchange efficiency is high; After heat-conducting medium heat release condensation, from steam state, become liquid state, heat absorption, evaporation, transmission, heat release, condensation, backflow are continued in the lower end that is back to heat-exchange tube, and and so forth, high-speed circulating, guarantees that using waste heat from tail gas fully reclaims; Hot-air after heat exchange enters the air inlet boiler of feeding calcining of boiler and uses, waste heat fully reclaims and recycles, effectively reduced the consumption of coal, energy consumption is low and meet the requirement of national energy-saving environmental protection, has advantages of that simple in structure, using waste heat from tail gas reclaims fully, heat exchange efficiency is high.
Further, the heat-conducting medium of heat-exchange tube is water or liquefied ammonia.Certainly, heat-conducting medium can also be the heat-conducting medium that multiple inorganic active metal and compound thereof become, good heat conduction effect, and nontoxic, corrosion-free, security performance is high.0.5～0.8 times of the interior cavity length that the length of the upper end that is placed on ventilation duct of heat-exchange tube is described ventilation duct, 0.5～0.8 times of the interior cavity length that the length of the lower end that is placed on heating pipe of described heat-exchange tube is described heating pipe.The tube wall joint place of the postmedian of ventilation duct and heating pipe is provided with a plurality of described heat-exchange tubes, and the spacing of adjacent two heat-exchange tubes is 5～10cm.Described in each, heat-exchange tube is vertically inserted in the tube wall joint place of described ventilation duct and heating pipe.
Further, the vent outlet 51 that oozes of described film filter is communicated with the gas outlet of described ventilation duct.Under the effect of extractor fan, infiltration gas is that oxygen can together enter boiler air inlet with the air in ventilation duct and burns, and has improved the oxygen content of coal burning in boiler, improves coal burning efficiency, the full combustion of fuel such as coal, avoid producing secondary pollution.
Wherein, described pressure-regulating device is the pressure-regulating device that includes compressor.Described pressure-regulating device is that conventional membrane type is back and forth or without oily centrifugal compressor.
Beneficial effect of the present invention is: coal-fired boiler tail gas membrane filtration enriched oxygen recycling method of the present invention, comprises the following steps: steps A, the coal that boiler combustion is used and desulphurizer mixing are made desulfurized coal, desulfurized coal is dropped into boiler air inlet and burn; Step B, the tail gas that coal-burning boiler is discharged are concentrated and are carried out waste heat recovery processing, make tail gas cooling; Step C, by above-mentioned tail gas by pressure-regulating device, utilize specific gravity of gas difference to make the stratification of hot gas in tail gas; Step D, by the gas after layering by retracting device, reclaim; Step e, make to reclaim after remaining mixed tail gas by adsorbent equipment, adsorb; Step F, the first air inlet that remaining circulation of tail gas in step e is introduced to boiler carry out second-time burning, at the second air inlet of boiler, film filter are set, will be by the oxygen O of film filter
2introduce burning in coal-burning boiler.Recycling device, comprise the exhaust waste heat recovery device, pressure-regulating device, the adsorbent equipment that are connected with the chimney of coal-burning boiler that connect successively, described pressure-regulating device is connected with retracting device, and the gas outlet of described exhaust waste heat recovery device is provided with film filter.The present invention has advantages of that cost is low, technique is simple, fuel economy is high, fuel consumption is few, low in the pollution of the environment.
Membrane oxygen enrichment technology oxygen enrichment principle: film oxygen enriching is that the infiltration rate while utilizing each component in air to see through film is different, under pressure differential drives, makes oxygen in air preferentially by having the film of collecting oxygen function, can obtain the oxygen-enriched air that oxygen content is higher.Utilize this film to carry out separating for several times, can obtain the oxygen rich air air containing 90% above oxygen.The research of oxygen permeable membrane obtains important application at aspects such as medical treatment, fermentation industry, chemical industry, oxygen-enriched combustings.
The course of work of the present invention is as follows:
Coal and desulphurizer mixing are made after desulfurized coal and dropped in boiler and burn, the tail gas producing after coal-fired boiler combustion is discharged from chimney, first after the temperature that reduces tail gas through exhaust waste heat recovery device, by pressure-regulating device, pressurize again, because the proportion of gas is different, CO is reclaimed in the stratification of hot gas after pressurization
2; Adsorbent equipment is by CO a small amount of in tail gas
2with micro-SO
2after pernicious gas absorption, remaining with N
2be that main tail gas is recycled to introduce in boiler and carries out second-time burning, waste-heat recovery device is by waste heat recovery circulation during to boiler, with the air of waste heat, is introduced into film filter, under the effect of film filter, and the O of high temperature
2through film separating layer, enter in boiler and burn away, improve fuel economy, waste heat is utilized, and has reduced the thermal pollution to environment, avoids the direct exhaust emission environment of Tail Gas.
The invention has the advantages that:
(1) adopt desulphurization during combustion coal to substitute common coal, sulphur is precipitated in solid waste, avoid discharging in tail gas sulfur dioxide (SO
2) etc. pernicious gas, low in the pollution of the environment.
(2) utilize adsorbent equipment the pernicious gas in coal-fired boiler tail gas can be reclaimed, avoid pernicious gas discharged to atmosphere contaminated environment, low in the pollution of the environment, meet the requirement that national energy-saving reduces discharging.
(3) utilize pressure-regulating device, make carbon dioxide layering and be collected, the gas secondary of collecting can be utilized, as by carbon dioxide for the preparation of soda ash, there is certain economic benefit.
(4) adopt advanced membrane oxygen enrichment technology in boiler, to introduce oxygen-enriched air, can significantly improve fuel combustion conditions, have low cost, reliable advantage, has very strong adjusting adaptive capacity to fuel gases calorific value and oxygen-rich concentration variation, strengthening gas-fired combustion-supporting, guarantee coal completing combustion, improve the thermal efficiency, save fuel, greatly reduce discharge amount of exhaust gas and air pollution, energy-saving effect is remarkable; In addition, due to the raising of oxygen enrichment percentage, can make ignition temperature improve, be conducive to the utilization of low calorie fuels, improve flame intensity, accelerate burning velocity.
(5) utilize film filter oxygen concentration circulation can be used to coal-burning boiler, improve the efficiency of combustion of coal, coal fully burns, and avoids producing secondary pollution, reduces production costs.
(6) utilize exhaust waste heat recovery device that waste heat recoveries a large amount of in coal-fired boiler tail gas circulation are used to boiler, effectively avoid waste and the pollution of using waste heat from tail gas, reduce the consumption of the fuel such as coal, in addition, tail gas after cooling is conducive to the operations such as follow-up pressurization layering collection and membrane filtration, and equipment requirement is low.
(7) to have technological process simple in the present invention, equipment is simple, easy and simple to handle, and production cost is low, economic benefit is obvious, meet boiler combustion requirement completely, not only save the consumption of the fuel such as coal but also extracted carbon dioxide, in addition, the present invention is without exhaust emission, and avoid producing the subparticle that diameter is less than PM2.5, there is certain economic benefit and social benefit, be convenient to implement.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling device of the present invention.
Fig. 2 is the structural representation of the exhaust waste heat recovery device of a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling device of the present invention.
In Fig. 1 and Fig. 2, include:
1---boiler 11---first air inlet 12---the second air inlet
2---exhaust waste heat recovery device 21---heating pipe 22---ventilation ducts
23---heat-exchange tube 24---extractor fan 3---pressure-regulating devices
4---adsorbent equipment 5---film filter 51---oozes vent outlet.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
embodiment mono-.
As depicted in figs. 1 and 2, coal-fired boiler tail gas membrane filtration enriched oxygen recycling method of the present invention, comprises the following steps:
Steps A, coal and desulphurizer mixing that boiler 1 is burnt to use are made desulfurized coal, desulfurized coal is dropped into boiler 1 air inlet and burn; Boiler 1 desulphurization during combustion coal, has greatly reduced the content of boiler 1 sulfur dioxide in tail gas gas, low in the pollution of the environment.
The desulfurizing agent of the present embodiment is become by the mixed raw material of following percentage by weight:
Calcium hydroxide Ca (OH)
275%
The cinder producing after coal combustion or tripoli ore deposit 15%
Sodium carbonate Na
2cO
35%
Step B, the tail gas that coal-burning boiler 1 is discharged are concentrated and are carried out waste heat recovery processing, make tail gas cooling; Further, the exhaust temperature after cooling is 20 ℃;
Step B1, carries out tail gas dust recovery by the tail gas after cooling by dust arrester.Dust arrester is sack cleaner.
Step C, by above-mentioned tail gas by pressure-regulating device 3, utilize specific gravity of gas difference to make the stratification of hot gas in tail gas; The force value of pressure-regulating device 3 is 1 standard atmospheric pressure;
Step D, by the gas after layering by retracting device, reclaim, obtain carbon dioxide.Described retracting device comprises buffering gas tank and conduit, by the carbon dioxide CO in lower floor after layering
2gas, and the nitrogen N in upper strata after layering
2gas, reclaims with buffering gas tank respectively.
Step e, make to reclaim after remaining mixed tail gas by adsorbent equipment 4, adsorb; Described film filter 5 is oxygen permeable membrane filter, and described oxygen permeable membrane filter can make oxygen O
2by film separating layer, and nitrogen N
2tunicle separating layer stops, improves the oxygen O in coal-burning boiler 1
2concentration, improves burning of coal utilization rate.
Step F, the first air inlet 11 that remaining circulation of tail gas in step e is introduced to boiler 1 carry out second-time burning, at the second air inlet 12 of boiler 1, film filter 5 are set, will be by the oxygen O of film filter 5
2introduce the interior burning of coal-burning boiler 1.
A kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling device, comprise successively exhaust waste heat recovery device 2, pressure-regulating device 3, adsorbent equipment 4 that the chimney with coal-burning boiler 1 that connects is connected, described pressure-regulating device 3 is connected with retracting device, and the gas outlet of described exhaust waste heat recovery device 2 is provided with film filter 5.
The exhaust waste heat recovery device 2 of the present embodiment comprises the heating pipe 21 being communicated with the chimney of coal-burning boiler 1, ventilation duct 22 and the heat-exchange tube 23 that is built-in with heat-conducting medium, the tube wall of the tube wall of described ventilation duct 22 and described heating pipe 21 fits, described heat-exchange tube 23 is inserted in the tube wall joint place of described ventilation duct 22 and heating pipe 21, the inner chamber of described heating pipe 21 and the inner chamber of described ventilation duct 22 are stretched into respectively in the two ends of described heat-exchange tube 23, the air inlet of described ventilation duct 22 is provided with extractor fan 24, the gas outlet of described ventilation duct 22 is communicated with the second air inlet 12 of described coal-burning boiler 1.
The pressure-regulating device 3 of the present embodiment is for including the pressure-regulating device 3 of compressor.Described pressure-regulating device 3 is conventional membrane type reciprocating compressor.
embodiment bis-.
As depicted in figs. 1 and 2, coal-fired boiler tail gas membrane filtration enriched oxygen recycling method of the present invention, comprises the following steps:
Steps A, coal and desulphurizer mixing that boiler 1 is burnt to use are made desulfurized coal, desulfurized coal is dropped into boiler 1 air inlet and burn; Boiler 1 desulphurization during combustion coal, has greatly reduced the content of boiler 1 sulfur dioxide in tail gas gas, low in the pollution of the environment.
The desulfurizing agent of the present embodiment is become by the mixed raw material of following percentage by weight:
Calcium hydroxide Ca (OH)
280%
The cinder producing after coal combustion or tripoli ore deposit 10%
Sodium carbonate Na
2cO
35%
Step B, the tail gas that coal-burning boiler 1 is discharged are concentrated and are carried out waste heat recovery processing, make tail gas cooling; Further, the exhaust temperature after cooling is 50 ℃;
Step B1, carries out tail gas dust recovery by the tail gas after cooling by dust arrester.Dust arrester is sack cleaner.
Step C, by above-mentioned tail gas by pressure-regulating device 3, utilize specific gravity of gas difference to make the stratification of hot gas in tail gas; The force value of pressure-regulating device 3 is 2 standard atmospheric pressures;
Step D, by the gas after layering by retracting device, reclaim, obtain carbon dioxide.Described retracting device comprises buffering gas tank and conduit, by the carbon dioxide CO in lower floor after layering
2gas, and the nitrogen N in upper strata after layering
2gas, reclaims with buffering gas tank respectively.
Step e, make to reclaim after remaining mixed tail gas by adsorbent equipment 4, adsorb; Described film filter 5 is oxygen permeable membrane filter, and described oxygen permeable membrane filter can make oxygen O
2by film separating layer, and nitrogen N
2tunicle separating layer stops, improves the oxygen O in coal-burning boiler 1
2concentration, improves burning of coal utilization rate.
Step F, the first air inlet 11 that remaining circulation of tail gas in step e is introduced to boiler 1 carry out second-time burning, at the second air inlet 12 of boiler 1, film filter 5 are set, will be by the oxygen O of film filter 5
2introduce the interior burning of coal-burning boiler 1.
A kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling device, comprise successively exhaust waste heat recovery device 2, pressure-regulating device 3, adsorbent equipment 4 that the chimney with coal-burning boiler 1 that connects is connected, described pressure-regulating device 3 is connected with retracting device, and the gas outlet of described exhaust waste heat recovery device 2 is provided with film filter 5.
The waste-heat recovery device of the present embodiment comprises the heating pipe 21 being communicated with the chimney of coal-burning boiler 1, ventilation duct 22 and the heat-exchange tube 23 that is built-in with heat-conducting medium, the tube wall of the tube wall of described ventilation duct 22 and described heating pipe 21 fits, described heat-exchange tube 23 is inserted in the tube wall joint place of described ventilation duct 22 and heating pipe 21, the inner chamber of described heating pipe 21 and the inner chamber of described ventilation duct 22 are stretched into respectively in the two ends of described heat-exchange tube 23, the air inlet of described ventilation duct 22 is provided with extractor fan 24, the gas outlet of described ventilation duct 22 is communicated with the second air inlet 12 of described coal-burning boiler 1.
The pressure-regulating device 3 of the present embodiment is for including the pressure-regulating device 3 of compressor.Described pressure-regulating device 3 for conventional without oily centrifugal compressor.
Certainly, the above is only better embodiment of the present invention, and the equivalence of doing according to structure, feature and principle described in patent claim of the present invention therefore all changes or modifies, and is included in patent claim of the present invention.
Claims (9)
1. a coal-fired boiler tail gas membrane filtration enriched oxygen recycling method, is characterized in that, comprises the following steps:
Steps A, the coal that boiler combustion is used and desulphurizer mixing are made desulfurized coal, desulfurized coal is dropped into boiler air inlet and burn;
Step B, the tail gas that coal-burning boiler is discharged are concentrated and are carried out waste heat recovery processing, make tail gas cooling;
Step B1, carries out tail gas dust recovery by the tail gas after cooling by dust arrester;
Step C, by above-mentioned tail gas by pressure-regulating device, utilize specific gravity of gas difference to make the stratification of hot gas in tail gas;
Step D, by the gas after layering by retracting device, reclaim;
Step e, make to reclaim after remaining mixed tail gas by adsorbent equipment, adsorb;
Step F, the first air inlet that remaining circulation of tail gas in step e is introduced to boiler carry out second-time burning, at the second air inlet of boiler, film filter are set, will be by the oxygen O of film filter
2introduce burning in coal-burning boiler.
2. a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling method according to claim 1, is characterized in that: in described steps A, desulfurizing agent is become by the mixed raw material of following percentage by weight:
Calcium hydroxide Ca (OH)
275～80%
The cinder producing after coal combustion or tripoli ore deposit 10～15%
Sodium carbonate Na
2cO
35%
Amino acid surplus.
3. a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling method according to claim 1, is characterized in that: in described step B, the temperature after tail gas cooling is 20～50 ℃.
4. a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling method according to claim 1, is characterized in that: in described step C, the force value of pressure-regulating device is 1～2 standard atmospheric pressure.
5. a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling method according to claim 1, is characterized in that: in described step D, described retracting device comprises buffering gas tank and conduit, by the carbon dioxide CO in lower floor after layering
2, and the nitrogen N in upper strata after layering
2gas, reclaims with buffering gas tank respectively.
6. a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling method according to claim 1, is characterized in that: the film filter in described step F is oxygen permeable membrane filter, and described oxygen permeable membrane filter can make oxygen O
2by film separating layer, and nitrogen N
2tunicle separating layer stops.
7. one kind for realizing the coal-fired boiler tail gas membrane filtration enriched oxygen recycling device of the method for claim 1, it is characterized in that: comprise the exhaust waste heat recovery device, dust arrester, pressure-regulating device, the adsorbent equipment that are connected with the chimney of coal-burning boiler that connect successively, described pressure-regulating device is connected with retracting device, and the gas outlet of described exhaust waste heat recovery device is provided with film filter.
8. a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling device according to claim 7, it is characterized in that: described exhaust waste heat recovery device comprises the heating pipe being communicated with the chimney of coal-burning boiler, ventilation duct and the heat-exchange tube that is built-in with heat-conducting medium, the tube wall of described ventilation duct and the tube wall of described heating pipe fit, described heat-exchange tube is inserted in the tube wall joint place of described ventilation duct and heating pipe, the inner chamber of described heating pipe and the inner chamber of described ventilation duct are stretched into respectively in the two ends of described heat-exchange tube, the air inlet of described ventilation duct is provided with extractor fan, the gas outlet of described ventilation duct is communicated with the second air inlet of described coal-burning boiler.
9. a kind of coal-fired boiler tail gas membrane filtration enriched oxygen recycling device according to claim 7, is characterized in that: described pressure-regulating device is the pressure-regulating device that includes compressor.
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| CN102935329B (en) * | 2012-11-29 | 2016-12-21 | 广东大众农业科技股份有限公司 | A kind of coal-fired boiler tail gas that recycles prepares the method and device of precipitated calcium carbonate |
| CN102935328A (en) * | 2012-11-29 | 2013-02-20 | 广东大众农业科技股份有限公司 | Method and device for preparing sodium carbonate by recycling tail gas of coal-fired boiler |
| CN103157340A (en) * | 2013-03-07 | 2013-06-19 | 陈卫星 | Process for realizing zero discharge of coal dusts |
| CN105289251B (en) * | 2015-11-05 | 2017-12-15 | 菏泽鑫鼎环境工程设备有限公司 | A kind of method with bioprotein ion film liquid desulfurization and dedusting |
| CN106635242A (en) * | 2016-12-07 | 2017-05-10 | 江西稀有金属钨业控股集团有限公司 | Method and device for utilizing scheelite concentrate smelting slag and application of scheelite concentrate smelting slag |
| CN112682816A (en) * | 2020-12-29 | 2021-04-20 | 连云港虹洋热电有限公司 | Coal-fired boiler tail gas membrane filtration oxygen enrichment recycling device and using method |
| CN115924858A (en) * | 2022-11-23 | 2023-04-07 | 安徽金禾实业股份有限公司 | Method for treating tail gas in sulfur dioxide production by sodium citrate method |
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