CN104162357A - Integrated spray flue gas waste heat recovery and denitration device - Google Patents
Integrated spray flue gas waste heat recovery and denitration device Download PDFInfo
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- CN104162357A CN104162357A CN201410397374.1A CN201410397374A CN104162357A CN 104162357 A CN104162357 A CN 104162357A CN 201410397374 A CN201410397374 A CN 201410397374A CN 104162357 A CN104162357 A CN 104162357A
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The invention provides an integrated spray flue gas waste heat recovery and denitration device. The device comprises a spray filler and alkali storage tower (1), a flue gas conveying and oxidization loop system, a spray conveying loop system, a heat energy utilization system and an alkalifying neutralization system, wherein the spray filler and alkali storage tower (1) comprises a spray filler and alkali storage tower main body structure part (11), a spray filler and alkali storage tower connector, filler (13), a dehydrator (14) and a spray component (15). According to the device, spray water is in contact with flue gas for heat exchange through the filler with a large specific surface area, the stable contact heat exchange area of gas and liquid phases is remarkably increased, the contact time of gas and liquid phases is remarkably prolonged and the uniformity of gas and liquid phases is remarkably improved, and the performance and the stability of gas liquid heat exchange are remarkably improved, so that the flue gas waste heat recovery efficiency and the denitration/desulfurization effect are remarkably improved.
Description
Technical field
The present invention relates to a kind of spray flue gas waste heat recovery and denitrification integrated device, particularly it is a kind of spray flue gas waste heat recovery and denitrification integrated device for natural gas boiler.
Background technology
The efficiency of natural gas boiler can reach 90% left and right, but expensive (being approximately 1.5 times of light oil, 5 times of coal) due to natural gas, so it is still extremely important how further to improve natural gas boiler efficiency, and reduce heat loss due to exhaust gas in existing boiler design technology, be the principal element that improves boiler efficiency, so how sensible heat and the latent heat in Mist heat recovering is the key that further promotes gas fired-boiler efficiency.Heat transmission equipment for existing void tower spraying with the device of the off-gas recovery of flue gas direct contact heat transfer, employing is sprayed into tiny mist pearl by cooling water, tiny mist pearl is at void tower (or being called heat exchanger) and flue gas direct contact heat transfer, be characterized in cooling water to be sprayed into tiny mist pearl falling slowly in void tower, conventionally the about 50 μ m of mist pearl of atomisation are below 1mm, mist pearl also needs the 5-10 contact heat-exchanging time of landing at a slow speed in second, mist pearl is excessive, and heat transfer effect is poor with contact heat-exchanging deficiency of time, so just cause following several main aspects not enough: (1) cooling water is sprayed into fine mist pearl falling at a slow speed in void tower, in tower, the flow resistance of the direct contact heat transfer of flue gas is fallen larger, conventionally there is 400-800Pa, some is even greater than 1000Pa, thereby cause the electrical power consumed of flue gas air exhauster or air blast excessive, (2) cooling water need to be sprayed into tiny mist pearl, and water pump needs larger pressure head, because only spraying at least needs the pressure differential of 0.1MPa to drive (spray effect that is generally 0.2-0.3MPa is better) conventionally, this just causes the electrical power consumed of water pump excessive, (3) the too small easy mist pearl of the mist pearl of spraying in addition, thereby cause environmental pollution and boiler flue corrosion etc., the excessive heat transfer effect of mist pearl of spraying is poor, consider the inhomogeneities of spraying and the inhomogeneities that load variations causes void tower flow field, conventionally adopt larger mist flow to improve the problems referred to above, but the problem of also simultaneously having brought spraying pump consumption significantly to increase, and the leaving water temperature of spraying cooling water is compared with low and cause the problem that waste heat energy utilization ratio is lower, (4) void tower spraying is very inhomogeneous with the interior flue gas flow field of tower of flue gas direct contact heat transfer, it is more obvious when the off-design of particularly loading is larger, in some situation, in tower, may occur serious flue gas bias current and backflow, this significantly descends degradation problem with regard to the unstability and the efficiency that cause system waste heat energy to utilize.Heat transmission equipment for the device of the off-gas recovery of flue gas and refrigerant wall-type heat exchange, adopt heat exchanger tube or heat pipe as heat exchange element, flue gas is separated (directly not contacting) with refrigerant (being generally water), because the convection transfer rate of flue gas is smaller, conventionally adopt fin to increase heat exchange area and enhanced heat exchange, and contain a large amount of dusts and corrosive substance and flue gas in flue gas, at temperature-fall period, there is a large amount of condensed waters, thereby cause fin seriously corroded, stop up and fouling, not only heat transfer effect is poor but also equipment life is shorter, in order to alleviate the problems referred to above, also have and not adopt fin and to adopt light pipe, but equipment volume is huge and investment significantly increases, water resistance and the flue gas flow resistance of the heat transmission equipment of the device that the low-temperature flue gas of this class formation reclaims are also all very large, namely the electrical power consumed of water pump and blower fan is all larger, energy-saving benefit is subject to the obvious effect of high power consumption.
In addition, nitrogen oxide and oxysulfide contained in flue gas after combustion of natural gas have pollution to atmosphere, although the nitrogen oxide by the single boiler of existing standard standard is qualified discharge, but along with the quantity of gas fired-boiler increases, its total amount that is discharged into aerial nitrogen oxide is also increasing, to the air quality of specific region be produced to certain impact, probably in some region in the future, need to improve standard limit of smog release; Meanwhile, because the content of gas fired-boiler nitrogen oxides in effluent is relatively low, the investment and the running cost that increase conventional denitration device are relatively high, therefore need to develop low input, low operating cost, high efficiency gas fired-boiler equipment for denitrifying flue gas.
Chinese patent 201210156824.9 discloses a kind of gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration and water collecting function, this patent of invention technology can also can be removed the part nitrogen oxide of flue gas in Mist heat recovering, but due to this device adopt in waste-heat recovery device flue gas first through the heat exchange of plate type heat exchanger partition again through spray or spray absorber nitrogen oxides in effluent and then with " one-level heat exchange+absorption+secondary heat exchange " mode of evaporator with heat pump partition heat exchange, the temperature of flue gas after the process of spray or spray absorber nitrogen oxide significantly reduces so on the one hand, cause the part of waste heat of flue gas be not utilized and be wasted, and the effect of the spray of void tower or spray absorber nitrogen oxide and oxysulfide is poor causes a large amount of acidic materials in flue gas to enter follow-up evaporator with heat pump may to make evaporator with heat pump occur the more serious problems such as corrosion.
Chinese patent 200910238452.2 has proposed a kind of pump type heat gas fired-boiler waste heat recovery unit, adopt two-stage flue gas-recirculated water recuperator (gas-water heat exchanger and flue gas condensing heat exchanger), if adopt finned tube exchanger, easily cause fin seriously corroded, obstruction and fouling, if adopt light pipe heat exchanger, equipment is huge and investment is remarkable increases, no matter be to adopt finned tube or the heat exchanger of light pipe, its water resistance and flue gas flow resistance are also all very large, and the electrical power consumed of water pump and blower fan is all larger.
Chinese patent 201110282736.4 discloses a kind of smoke waste heat all recovering device for gas boiler, this utility model patent technology can be removed part nitrogen oxide in flue gas in Mist heat recovering, be mainly nitrogen dioxide, but be difficult to remove the larger nitric oxide of content in flue gas; In addition the hybrid cooling device arranging has obviously increased the loss of the heat-transfer capability of system, has also obviously reduced UTILIZATION OF VESIDUAL HEAT IN efficiency.
The disclosed central heating system that utilizes absorption heat pump Mist heat recovering of Chinese patent 201110110470.X, the disclosed a kind of contact-type advanced recycling system for waste heat of low-temperature flue gas of the flue gas waste heat recovery apparatus of Chinese patent 200720186994.6 disclosed a kind of contacts and Chinese patent 20111046805.6, it is all void tower spraying direct-contact heat exchanger, shower water need to be sprayed into 100 μ m to the following fine mist pearl of 1mm, fine mist pearl is again in void tower in floating dropping process at a slow speed and flue gas direct contact heat transfer, the flow resistance of spray water and flue gas is all larger, and also need larger spray water flow for the heat transfer effect having reached, thereby the electrical power of water pump and Flue Gas Forced Draft Fan is all larger, simultaneously because the flue gas contact heat-exchanging of spraying in void tower is easy to occur more serious bias current, the distribution of flue gas in void tower is very inhomogeneous, even may there is large vortex, also having had a strong impact on heat transfer effect even also affects the stability of system works.In addition,, because the nitrogen oxide in flue gas is mainly the NO that is insoluble in water, the denitration effect of residual neat recovering system is poor.
In sum, in prior art, at least there is following problem: the electrical power that the spraying/feeding spraying pump of existing waste-heat recovery device and flue gas drive pressure fan is all larger, energy-saving effect obvious effect to waste heat recovery, the denitration effect of flue gas is also poor simultaneously.
Summary of the invention
The invention provides a kind of spray flue gas waste heat recovery and denitrification integrated device, can obtain good flue gas waste heat recovery efficiency and energy-saving benefit, simultaneously can also obtain good denitration desulfurized effect, to solve existing low-temperature flue gas waste heat, reclaim the problems such as the low and denitration desulfurized effect of heat exchange efficiency is poor.
For this reason, the present invention proposes a kind of spray flue gas waste heat recovery and denitrification integrated device, described spray flue gas waste heat recovery and denitrification integrated device comprise: spraying filler and storage washing tower (for removing CO2) 1, flue gas is carried and oxidation circuit system, spray conveying loop system, heat energy utilization system and add alkali neutralized system;
Described spraying filler and storage washing tower (for removing CO2) 1, comprise: spraying filler and storage washing tower (for removing CO2) body junction member 11, spraying filler and storage washing tower (for removing CO2) interface, filler 13, dehydrater 14 and spray assembly 15, wherein, spraying filler is tower structure with storage washing tower (for removing CO2) body junction member 11, it is the spray packed tower central dividing plate 112 arranging from bottom to up by spray packed tower shell body 111 and spray packed tower shell body 111, the compositions such as packing support plate 113 and dehydrater gripper shoe 114, described spray packed tower central dividing plate 112 separates spray packed tower shell body 111 inner chambers for bottom alkali lye storage area JY and upper smoke gas blowout pouring heat transfer space YQ, spray packed tower central dividing plate 112 is accepted the shower water 16 that the spray heat exchange of heat transfer space YQ is drenched in upper smoke gas blowout, alkali lye 17 is stored in alkali lye storage area, bottom JY, on shower water, liquid level 161 is higher than spray packed tower central dividing plate 112, on alkali lye, liquid level 171 is lower than spray packed tower central dividing plate 112, on spray packed tower shell body 111, be provided with spraying filler and storage washing tower (for removing CO2) interface, spraying filler comprises smoke inlet 121 with storage washing tower (for removing CO2) interface, exhanst gas outlet 122, Sprayer Circulation water out 123, Sprayer Circulation water inlet 124, alkali lye outlet 125, manhole, alkali input port 127, shower water overfall 128 and up and down connection combination take over 129, on packing support plate 113, be placed with filler 13 to realize the absorption of contact heat-exchanging and the acidic materials of shower water and flue gas, in dehydrater gripper shoe 114, be placed with dehydrater 4 with the collection of tiny drops of water in realizing out tower flue gas, described bottom alkali lye storage area JY and described upper smoke gas blowout are drenched heat transfer space YQ and are communicated with up and down combination and are taken over 129 and be communicated with to realize pouring water and the function such as pressure balance of alkali lye storage area, bottom JY by described, namely, the main function of described spraying filler and storage washing tower (for removing CO2) 1 is for realizing shower water and flue gas contact heat-exchanging Mist heat recovering in filler, add the alkali lye in shower water in filler, to absorb the acidic materials in flue gas, and the function that stores alkali lye,
Described flue gas is carried and oxidation circuit system, to connect chimney 60 and pipeline and the relevant device of described spraying filler with storage washing tower (for removing CO2) 1, comprise: conveying fan 21, flue gas enters spraying filler and the pipeline 22 that stores up washing tower (for removing CO2), flue gas goes out spraying filler and the pipeline 23 that stores up washing tower (for removing CO2), Oxidizer distribution blender 24 and oxidant generation system 25, its main function is for connecting chimney 60 and spraying filler and storage washing tower (for removing CO2) 1, flue gas is transported to spraying filler and stores up in washing tower (for removing CO2) 1, flue gas is carried with oxidation circuit system and is realized and in flue gas, add oxidant and oxidant is mixed to the Low-Charged Nitrogen oxide in flue gas is oxidized to the nitrogen oxide of high price with flue gas simultaneously,
Described spray conveying loop system, to connect spraying filler and pipeline and the relevant device of storage washing tower (for removing CO2) 1 with heat energy utilization system, comprise: feeding spraying pump 31, spray is extracted pipeline 32 out, feeding spraying pump discharge connection 33, spray inlet pipeline 34, unnecessary condensed water discharge pipe road 35, described spray conveying loop system, its main function is by spraying filler and the shower water that stores up storage in washing tower (for removing CO2) 1, after being delivered to heat energy utilization system, lower the temperature, then be transmitted back to again in the spray assembly 15 in spraying filler and storage washing tower (for removing CO2) 1, shower water is sprayed on filler 13 through spray assembly 15 again, shower water in filler with smoke contact heat exchange, flue-gas temperature reduces and shower water heats up after absorbing the sensible heat of flue gas and latent heat, shower water has also absorbed the acidic materials in flue gas (nitrogen oxide and oxysulfide) and has been neutralized by the alkaline matter in shower water simultaneously, the shower water of intensification and absorption acidic materials falls under gravity in the storage tank in spraying filler and storage washing tower (for removing CO2) 1, realize the cyclic process that a shower water cooling heats up, and because the latent heat of shower water in absorbing flue gas constantly increases shower water, need to be according to condensation number and shower water water level by shower water through unnecessary condensed water discharge pipe road 35 or shower water overfall 128 discharge unnecessary shower water (condensed water) to reach the balance of shower water and stable,
Described heat energy utilization system, comprise heat energy utilization equipment 40, heat energy utilization inlet pipeline 41 and heat energy utilization outlet pipeline 42, its main function is with the fume afterheat that shower water is absorbed, can utilize from spraying filler and the high temperature shower water cooling of storing up extraction washing tower (for removing CO2) 1, and described heat energy utilization equipment 40 is heat pump or heat exchanger;
The described alkali neutralized system that adds, to connect spraying filler and the alkali lye outlet 125 of storage washing tower (for removing CO2) 1 and pipeline and the relevant device of spray conveying loop system, the described alkali neutralized system that adds comprises: add alkali pump 51, add alkali pipeline 52 and add in alkali and Measurement and Control System (do not mark in embodiment and add in alkali and Measurement and Control System), its main function is appropriate alkalescence for automatically add appropriate alkali lye 17 take keeping shower water according to the acid-base value of shower water (pH value), prevent that shower water from absorbing flue gas middle acid substance and becoming acid water and etching system equipment, and make after flue gas desulfurization and denitrification the condensed water of spraying cooling in flue gas reach discharge standard.
Further, the present embodiment is selected ripple packing, and ripple packing specific area is selected 100-500m
2/ m
3, the flue gas pressure reduction of packing layer is generally in 100-200Pa left and right.Concrete, select specific area 250m
2/ m
3stainless steel ripple filler, ripple packing height 1.5m, experiment records the about 150Pa of flow of flue gas Pressure Drop in filler.
Further, a kind of spray packed tower for flue gas waste heat recovery of the present embodiment is selected stainless steel or the plastic ripple filler that corrosion resistance is high.
Further, the flue-gas temperature 90 degree left and right of the smoke inlet 121 of a kind of spray packed tower for flue gas waste heat recovery of the present embodiment, the flue-gas temperature that flue gas is discharged by the exhanst gas outlet 122 by spray packed tower shell body 111 tops through filler 13 and shower water heat exchange is 30 degree left and right, simultaneously, SOx (sulfur oxide in flue gas, also referred to as oxysulfide, be for example sulfur dioxide) and NOx (nitrogen oxide, for example, for nitric oxide) through oxidant oxidation and in filler fully with contain in and alkali substance reaction and the absorption of acidic materials, in flue gas, graininess dust is also absorbed by shower water.And then the flue gas that exhanst gas outlet 122 is discharged can reach good discharge standard.
For spraying direct contact heat transfer technology, in the process of the absorption of shower water and smoke contact heat exchange and acidic materials, filler is to provide a stable huge contact area, shower water is comparatively evenly sprayed on filler, under gravity and capillary effect, shower water is being dispersed on filling surface at filling surface uniform spreading in trickling downwards, flue gas adverse current in filler flows through, in the time of flue gas and filling surface heat exchange, flue gas middle acid substance is by shower water and shower water neutral and alkali material absorbing and neutralization, not only heat exchange and good absorbing effect but also flow resistance are little.Thereby with respect to prior art, the successful of heat exchange of the present invention and desulphurization denitration strengthens, flow of flue gas resistance also obviously reduces.
Accompanying drawing explanation
Fig. 1 is a kind of fundamental diagram that sprays flue gas waste heat recovery and denitrification integrated device of embodiments of the invention.
Fig. 2 is the spraying filler of the embodiment of the present invention and the structural representation of storage washing tower (for removing CO2).
Drawing reference numeral explanation:
1-spraying filler and storage washing tower (for removing CO2), 11-spraying filler and storage washing tower (for removing CO2) body junction member, 111-spraying filler and storage washing tower (for removing CO2) shell body, 112-spraying filler and storage washing tower (for removing CO2) central dividing plate, 113-packing support plate, 114-dehydrater gripper shoe, 121-smoke inlet, 122-exhanst gas outlet, 123-Sprayer Circulation water out, 124-Sprayer Circulation water inlet, the outlet of 125-alkali lye, 1261-lower manhole, 1262-middle manhole, 1263-upper manhole, 127-alkali input port, 128-shower water overfall, 129-be communicated with up and down combination to take over, 13-filler, 14-dehydrater, 15-spray assembly, 16-shower water, liquid level on 161-shower water, 17-alkali lye, liquid level on 171-alkali lye,
21-conveying fan, 22-flue gas enters spraying filler and the pipeline that stores up washing tower (for removing CO2), and 23-flue gas goes out spraying filler and the pipeline that stores up washing tower (for removing CO2), 24-Oxidizer distribution blender, 25-oxidant generation system,
31-feeding spraying pump, 32-spray is extracted pipeline out, 33-feeding spraying pump discharge connection, 34-spray inlet pipeline, 35-unnecessary condensed water discharge pipe road,
40-heat energy utilization equipment (heat pump or heat exchanger), 41-heat energy utilization inlet pipeline, 42-heat energy utilization outlet pipeline,
51-add alkali pump, 52-add alkali pipeline,
60-chimney,
JY-alkali lye storage area, heat transfer space is drenched in the gas blowout of YQ-upper smoke.
The specific embodiment
For technical characterictic of the present invention, object and effect being had more clearly, understand, now contrast accompanying drawing explanation the present invention.
Fig. 1 is a kind of fundamental diagram that sprays flue gas waste heat recovery and denitrification integrated device of embodiments of the invention.Fig. 2 is the spraying filler of the embodiment of the present invention and the structural representation of storage washing tower (for removing CO2).
As depicted in figs. 1 and 2, a kind of spray flue gas waste heat recovery of the present invention and denitrification integrated device, comprising: spraying filler and storage washing tower (for removing CO2) 1, and flue gas is carried and oxidation circuit system, spray conveying loop system, heat energy utilization system and add alkali neutralized system;
Described spraying filler and storage washing tower (for removing CO2) 1, comprise: spraying filler and storage washing tower (for removing CO2) body junction member 11, spraying filler and storage washing tower (for removing CO2) interface, filler 13, dehydrater 14 and spray assembly 15, wherein, spraying filler is tower structure with storage washing tower (for removing CO2) body junction member 11, it is the spray packed tower central dividing plate 112 arranging from bottom to up by spray packed tower shell body 111 and spray packed tower shell body 111, the compositions such as packing support plate 113 and dehydrater gripper shoe 114, described spray packed tower central dividing plate 112 separates spray packed tower shell body 111 inner chambers for bottom alkali lye storage area JY and upper smoke gas blowout pouring heat transfer space YQ, spray packed tower central dividing plate 112 is accepted the shower water that the spray heat exchange of heat transfer space YQ is drenched in upper smoke gas blowout, on spray packed tower shell body 111, be provided with spraying filler and storage washing tower (for removing CO2) interface, spraying filler comprises smoke inlet 121 with storage washing tower (for removing CO2) interface, exhanst gas outlet 122, Sprayer Circulation water out 123, Sprayer Circulation water inlet 124, alkali lye outlet 125, manhole, alkali input port 127, shower water overfall 128 and up and down connection combination take over 129, on packing support plate 113, be placed with filler 13 to realize the absorption of contact heat-exchanging and the acidic materials of shower water and flue gas, in dehydrater gripper shoe 114, be placed with dehydrater 4 to realize out the collection of (small) globule in tower flue gas, described bottom alkali lye storage area JY and described upper smoke gas blowout are drenched heat transfer space YQ and are communicated with up and down combination and are taken over 129 and be communicated with to realize pouring water and the function such as pressure balance of alkali lye storage area, bottom JY by described, namely, the main function of described spraying filler and storage washing tower (for removing CO2) 1 is for realizing shower water and flue gas contact heat-exchanging Mist heat recovering in filler, add the alkali lye in shower water in filler, to absorb the acidic materials in flue gas, and the function that stores alkali lye,
In described spraying filler and storage washing tower (for removing CO2) 1, the operation principle of the absorption of filler spray contact heat-exchanging and acidic materials is: the flue gas from chimney enters the upper smoke gas blowout pouring heat transfer space YQ in spray packed tower shell body 111 through smoke inlet 121, smoke gas flow is through filler 13 and shower water heat exchange in filler of flowing out through spray assembly 2, flue gas when temperature reduces in flue gas a large amount of condensed waters be condensed and emit a large amount of condensation heat, the temperature of shower water shower water after absorbing the sensible heat of flue gas and latent heat raises, simultaneously owing to containing certain density alkaline matter (PH>7) in shower water, shower water absorbs SO2 and the NO2 in flue gas and is converted into neutral salt, the shower water heating up falls into the shower water storage water tank that heat transfer space YQ bottom is drenched in upper smoke gas blowout, then through being arranged on the Sprayer Circulation water out 123 of bottom, be drawn to waste heat utilization equipment (as heat pump, heat exchanger) utilize, through with waste heat utilization equipment heat exchange after the temperature of shower water reduce and be delivered to Sprayer Circulation water inlet 124 and through spray assembly 2, spray again, so circulation.In this process, both obtain low-temperature flue gas waste heat and reached energy-conservation object, the also discharge of particle in the discharge of while remarkable minimizing SOx and NOx (nitrogen oxide and sulfur oxide) and flue gas, obtains the environment protecting of the discharge of minimizing pollutant significantly.For spraying direct contact heat transfer technology, in the process of the absorption of shower water and smoke contact heat exchange and acidic materials, filler is to provide a stable huge contact area, shower water is comparatively evenly sprayed on filler, under gravity and capillary effect, shower water is being dispersed on filling surface at filling surface uniform spreading in trickling downwards, flue gas adverse current in filler flows through, in the time of flue gas and filling surface heat exchange, flue gas middle acid substance is by shower water and shower water neutral and alkali material absorbing and neutralization, not only heat exchange and good absorbing effect but also flow resistance are little.Thereby with respect to prior art, the successful of heat exchange of the present invention and desulphurization denitration strengthens, flow of flue gas resistance also obviously reduces.
Described flue gas is carried and oxidation circuit system, to connect chimney 60 and pipeline and the relevant device of described spraying filler with storage washing tower (for removing CO2) 1, comprise: conveying fan 21, flue gas enters spraying filler and the pipeline 22 that stores up washing tower (for removing CO2), flue gas goes out spraying filler and the pipeline 23 that stores up washing tower (for removing CO2), Oxidizer distribution blender 24 and oxidant generation system 25, its main function is for connecting chimney 60 and spraying filler and storage washing tower (for removing CO2) 1, flue gas is transported to spraying filler and stores up in washing tower (for removing CO2) 1, flue gas is carried with oxidation circuit system and is realized and in flue gas, add oxidant and oxidant is mixed to the Low-Charged Nitrogen oxide in flue gas is oxidized to the nitrogen oxide of high price with flue gas simultaneously,
Described spray conveying loop system, to connect spraying filler and pipeline and the relevant device of storage washing tower (for removing CO2) 1 with heat energy utilization system, comprise: feeding spraying pump 31, spray is extracted pipeline 32 out, feeding spraying pump discharge connection 33, spray inlet pipeline 34, unnecessary condensed water discharge pipe road 35, described spray conveying loop system, its main function is by spraying filler and the shower water that stores up storage in washing tower (for removing CO2) 1, after being delivered to heat energy utilization system, lower the temperature, then be transmitted back to again in the spray assembly 15 in spraying filler and storage washing tower (for removing CO2) 1, shower water is sprayed on filler 13 through spray assembly 15 again, shower water in filler with smoke contact heat exchange, flue-gas temperature reduces and shower water heats up after absorbing the sensible heat of flue gas and latent heat, shower water has also absorbed the acidic materials in flue gas (nitrogen oxide and sulfur oxide) and has been neutralized by the alkaline matter in shower water simultaneously, the shower water of intensification and absorption acidic materials falls under gravity in the storage tank in spraying filler and storage washing tower (for removing CO2) 1, realize the cyclic process that a shower water cooling heats up, and because the latent heat of shower water in absorbing flue gas constantly increases shower water, need to be according to condensation number and shower water water level by shower water through unnecessary condensed water discharge pipe road 35 or shower water overfall 128 discharge unnecessary shower water (condensed water) to reach the balance of shower water and stable,
Described heat energy utilization system, comprise heat energy utilization equipment 40, heat energy utilization inlet pipeline 41 and heat energy utilization outlet pipeline 42, its main function is with the fume afterheat that shower water is absorbed, can utilize from spraying filler and the high temperature shower water cooling of storing up extraction washing tower (for removing CO2) 1, and described heat energy utilization equipment 40 is heat pump or heat exchanger;
The described alkali neutralized system that adds, to connect spraying filler and the alkali lye outlet 125 of storage washing tower (for removing CO2) 1 and pipeline and the relevant device of spray conveying loop system, the described alkali neutralized system that adds comprises: add alkali pump 51, add alkali pipeline 52 and add in alkali and Measurement and Control System (do not mark in embodiment and add in alkali and Measurement and Control System), its main function is appropriate alkalescence for automatically add appropriate alkali lye 17 take keeping shower water according to the acid-base value of shower water (pH value), prevent that shower water from absorbing flue gas middle acid substance and becoming acid water and etching system equipment, and make after flue gas desulfurization and denitrification the condensed water of spraying cooling in flue gas reach discharge standard.
Further, the present embodiment is selected ripple packing, and ripple packing specific area is selected 100-500m
2/ m
3, the flue gas pressure reduction of packing layer is generally in 100-200Pa left and right.Concrete, select specific area 250m
2/ m
3stainless steel ripple filler, ripple packing height 1.5m, experiment records the about 150Pa of flow of flue gas Pressure Drop in filler.The filler of the present embodiment is the heat exchange surface as flue gas, shower water can obtain good stable heat transfer effect as long as be evenly sprayed in filler to maintain the temperature of filling surface, the contact area of flue gas and filling surface is larger, when obtaining good heat transfer effect, the flow resistance of flue gas in filler is less, and the acidic materials in flue gas also absorb than the spray water film being easier to by filling surface.And for void tower spraying and flue gas direct contact heat transfer, flue gas is to carry out contact heat-exchanging with the surface that swims in small mist pearl in flue gas, reach identical contact heat-exchanging area and heat transfer effect, spray diameter is greatly about 50 microns, the small mist pearl of spraying also at least stopped for 5 seconds in void tower, the flue gas pressure reduction of this situation is at 400-600Pa, and water is sprayed into the spray water pump head that the mist pearl of about 50 microns at least needs to consume 0.2MPa, and the flow of the water pump that needs of spraying void tower relatively and spray packed tower to increase 30-50%.And a kind of spray packed tower for flue gas waste heat recovery of the present embodiment, owing to being provided with the filler that specific area is larger, as long as shower water is not conventionally the even larger water column of grade (being the globule), shower water even can also automatically scatter in trickling process in filler, as long as shower water can be sprayed on filler relatively equably, the contact area of flue gas and filling surface is compared with stablizing greatly, thereby the effect of its heat exchange and absorption acidic materials is just good and stable.On the one hand, because reaching same heat transfer effect, a kind of spray packed tower for flue gas waste heat recovery of the present embodiment can adopt less spray flow, with flue gas heat exchange after the temperature rise of shower water can improve 5-20 degree, thereby can obviously improve waste heat utilization equipment as the service behaviour of heat pump and working range; On the other hand, because flow and the pressure head of the water pump of the conveying shower water of a kind of spray packed tower for flue gas waste heat recovery of the present embodiment all obviously reduces, the pressure head of blower fan also reduces significantly, thereby the conveying fan of a kind of spray packed tower for flue gas waste heat recovery of the present embodiment and the electrical power of water pump, compare with flue gas direct contact heat transfer mode with void tower spraying, the electrical power 30-50% that can save blower and water pump even waits many, and energy-saving effect is obvious.
Further, a kind of spray packed tower for flue gas waste heat recovery of the present embodiment is selected ripple packing, it is all more balanced how waste heat recovery thermic load changes the flow resistance of flue gas in ripple packing, the bias current of flue gas in tower and the problem of backflow that there will not be void tower spraying direct contact heat transfer, and the long-pending reliable and stable namely heat exchange property of filling surface is reliable and stable, thereby the stability of UTILIZATION OF VESIDUAL HEAT IN and all relative obviously raisings of the efficiency of UTILIZATION OF VESIDUAL HEAT IN.And not only may there is bias current and backflow in void tower spraying direct contact heat transfer in tower, it is especially outstanding when particularly recuperation of heat load off-design is larger, and its spray effect significantly affects heat transfer effect and heat recovery efficiency, because the surface area that void tower spraying direct contact heat transfer is the small mist pearl of spraying provides the heat transfer sheet area of contact heat-exchanging, and spray effect unavoidably there will be fluctuation in During Process of Long-term Operation, or part spraying apparatus even damages etc. and makes spray effect variation very possible obstruction of During Process of Long-term Operation, thereby void tower spraying direct contact heat transfer with regard to the waste heat recovery performance of a kind of spray packed tower for flue gas waste heat recovery of relative the present embodiment the problem such as stable not and thermal efficiency fluctuation.The present embodiment has been eliminated the bias current of flow of flue gas and the impact of eddy current of void tower substantially, has avoided the tower body causing thus to vibrate, thereby increases the service life of tower, strengthens the security reliability of tower.
Further, a kind of spray packed tower for flue gas waste heat recovery of the present embodiment is selected stainless steel or the plastic ripple filler that corrosion resistance is high, and by being set, the method for automatic alkali adding neutralization can guarantee the acid-base value of shower water, thereby can eliminate that system burn into stops up and the problem of fouling, the reliability of equipment is high, and the life-span is long.
Further, the flue-gas temperature 90 degree left and right of the smoke inlet 121 of a kind of spray packed tower for flue gas waste heat recovery of the present embodiment, the flue-gas temperature that flue gas is discharged by the exhanst gas outlet 122 by spray packed tower shell body 111 tops through filler 13 and shower water heat exchange is 30 degree left and right, simultaneously, in flue gas SOx and NOx through oxidant oxidation and in filler fully with contain in and alkali substance reaction and the absorption of acidic materials, in flue gas, graininess dust is also absorbed by shower water, and the flue gas that exhanst gas outlet 122 is discharged can reach good discharge standard.A kind of spray packed tower for flue gas waste heat recovery of the present embodiment, the waste heat (sensible heat and latent heat) that absorbs low-temperature flue gas on the one hand reclaims condensed water simultaneously and obtains good energy-saving effect, can also take into account on the other hand denitration desulfurization and dedusting and automatic alkali adding technique, there is better environmental benefit.
Further, in order to reduce the radiation loss of bootstrap system, the spray packed tower of flue gas waste heat recovery and feed-line etc. are incubated.Simple and clear for legend, implement not mark insulation in illustration.
In sum, a kind of spray packed tower for flue gas waste heat recovery of the present invention, tool has the following advantages:
(1) a kind of spray packed tower for flue gas waste heat recovery of the present invention, shower water is by filler and the smoke contact heat exchange of bigger serface, stable contact heat-exchanging area and the time of contact of gas-liquid two-phase have significantly been increased, efficiency and the stability of gas-liquid heat exchange have been significantly improved, obviously reduced flow of flue gas resistance, also obviously reduced the shower water flow of the pressure of shower water, substantially the bias current of flow of flue gas and the impact of eddy current of spraying void tower contact heat-exchanging technology have been eliminated, avoided again the tower body vibration causing thus, thereby service life and the security reliability of tower have been increased, also can improve the temperature 5-20 ℃ of heat exchange condensed water, thereby can obviously reduce on the one hand the blower fan of supplied flue gases and the electrical power of carrying the water pump of shower water, the electrical power 30-50% that conventionally can save blower and water pump even waits many, also can improve on the other hand waste heat utilization equipment as the service behaviour of heat pump and working range, obtain better energy-saving benefit.
(2) the present invention is also by arranging oxidant generation system and Oxidizer distribution blender, on gas approach pipeline, in flue gas, add oxidant, and alkali lye storage area and the acidic materials in automatic alkali adding in shower water and in flue gas are set in the spray packed tower of flue gas waste heat recovery, the filler of the bigger serface in packed tower also provides the reaction of acidic materials and the area of absorption and time, thereby on the one hand through the flue gas of this technical finesse and more environmental protection of the discharge of condensed water, flue gas middle acid substance almost can reach zero-emission, and the investment of denitration device and running cost relatively low, also can avoid on the other hand the corrosion of equipment, fouling, stop up etc., in the reliability of extension device with in the life-span, also reduced the cost of maintenance maintenance, but also obviously improved the UTILIZATION OF VESIDUAL HEAT IN efficiency of the long-term operation of equipment.
The foregoing is only the schematic specific embodiment of the present invention, not in order to limit scope of the present invention.For each part of the present invention can mutually combine under the condition of not conflicting, any those skilled in the art, not departing from equivalent variations and the modification of making under the prerequisite of design of the present invention and principle, all should belong to the scope of protection of the invention.
Claims (5)
1. one kind sprays flue gas waste heat recovery and denitrification integrated device, it is characterized in that, described spray flue gas waste heat recovery and denitrification integrated device comprise: spraying filler and storage washing tower (for removing CO2) (1), flue gas is carried and oxidation circuit system, spray conveying loop system, heat energy utilization system and add alkali neutralized system;
Described spraying filler and storage washing tower (for removing CO2) (1), comprise: spraying filler and storage washing tower (for removing CO2) body junction member (11), spraying filler and storage washing tower (for removing CO2) interface, filler (13), dehydrater (14) and spray assembly (15), wherein, spraying filler is tower structure with storage washing tower (for removing CO2) body junction member (11), it is the spray packed tower central dividing plate (112) arranging from bottom to up by spray packed tower shell body (111) and spray packed tower shell body (111), packing support plate (113) and dehydrater gripper shoe (114) form, described spray packed tower central dividing plate (112) separates spray packed tower shell body (111) inner chamber for alkali lye storage area, bottom (JY) and upper smoke gas blowout pouring heat transfer space (YQ), spray packed tower central dividing plate (112) is accepted the shower water that the spray heat exchange of heat transfer space (YQ) is drenched in upper smoke gas blowout, on spray packed tower shell body (111), be provided with spraying filler and storage washing tower (for removing CO2) interface, spraying filler comprises smoke inlet (121) with storage washing tower (for removing CO2) interface, exhanst gas outlet (122), Sprayer Circulation water out (123), Sprayer Circulation water inlet (124), alkali lye outlet (125), manhole, alkali input port (127), (129) are taken in shower water overfall (128) and up and down connection combination, on packing support plate (113), be placed with filler (13) to realize the absorption of contact heat-exchanging and the acidic materials of shower water and flue gas, in dehydrater gripper shoe (114), be placed with dehydrater with the collection of the globule in realizing out tower flue gas, alkali lye storage area, described bottom (JY) and described upper smoke gas blowout are drenched heat transfer space (YQ) and are communicated with up and down combination adapter (129) connection to realize pouring water and pressure balance of alkali lye storage area, bottom (JY) by described, described spraying filler is realized shower water and flue gas contact heat-exchanging Mist heat recovering in filler with storage washing tower (for removing CO2) (1), absorb the acidic materials in flue gas, and storage alkali lye,
Described flue gas is carried and oxidation circuit system, connect chimney (60) and described spraying filler and storage washing tower (for removing CO2) (1), flue gas is transported to spraying filler and stores up in washing tower (for removing CO2) (1), flue gas is carried with oxidation circuit system and is realized and in flue gas, add oxidant and oxidant is mixed to the Low-Charged Nitrogen oxide in flue gas is oxidized to the nitrogen oxide of high price with flue gas simultaneously, described flue gas is carried and oxidation circuit system, comprise: conveying fan (21), flue gas enters spraying filler and the pipeline (22) that stores up washing tower (for removing CO2), flue gas goes out spraying filler and the pipeline (23) that stores up washing tower (for removing CO2), Oxidizer distribution blender (24 and oxidant generation system (25),
Described spray conveying loop system, connect spraying filler and storage washing tower (for removing CO2) (1) and heat energy utilization system, described spray conveying loop system comprises: feeding spraying pump (31), spray is extracted pipeline (32) out, feeding spraying pump discharge connection (33), spray inlet pipeline (34) and unnecessary condensed water discharge pipe road (35), described spray conveying loop system is by the middle shower water storing of spraying filler and storage washing tower (for removing CO2) (1), after being delivered to heat energy utilization system, lower the temperature, then be transmitted back to again in the spray assembly (15) in spraying filler and storage washing tower (for removing CO2) (1), shower water is sprayed on filler (13) through spray assembly (15) again, shower water in filler with smoke contact heat exchange, flue-gas temperature reduces and shower water heats up after absorbing the sensible heat of flue gas and latent heat, simultaneously shower water has also absorbed the acidic materials in flue gas and has been neutralized by the alkaline matter in shower water, the shower water of intensification and absorption acidic materials falls under gravity in the storage tank in spraying filler and storage washing tower (for removing CO2) (1), realize the cyclic process that a shower water cooling heats up, and because the latent heat of shower water in absorbing flue gas constantly increases shower water, need to be according to condensation number and shower water water level by shower water through unnecessary condensed water discharge pipe road (35) or shower water overfall (128) discharge unnecessary shower water to reach the balance of shower water and stable,
Described heat energy utilization system, comprise heat energy utilization equipment (40), heat energy utilization inlet pipeline (41) and heat energy utilization outlet pipeline (42), described heat energy utilization system will can utilize with the fume afterheat that shower water is absorbed from spraying filler and the shower water cooling of storing up extraction washing tower (for removing CO2) (1), and described heat energy utilization equipment (40) is heat pump or heat exchanger;
The described alkali neutralized system that adds, connect spraying filler and export (125) and spray conveying loop system with the alkali lye of storage washing tower (for removing CO2) (1), the described alkali neutralized system that adds comprises: add alkali pump (51), add alkali pipeline (52) and add in alkali and Measurement and Control System, the described alkali neutralized system that adds adds appropriate alkali lye (17) take to keep shower water as alkalescence according to the acid-base value of shower water automatically, prevent that shower water from absorbing flue gas middle acid substance and becoming acid water and etching system equipment, and make after flue gas desulfurization and denitrification the condensed water of spraying cooling in flue gas reach discharge standard.
2. spray flue gas waste heat recovery as claimed in claim 1 and denitrification integrated device, is characterized in that, described filler is ripple packing, and ripple packing specific area is selected 100-500m
2/ m
3, the flue gas pressure reduction of packing layer is 100Pa-200Pa.
3. spray flue gas waste heat recovery as claimed in claim 2 and denitrification integrated device, is characterized in that, filler is selected specific area 250m
2/ m
3stainless steel ripple filler, ripple packing height 1.5m, the flue gas pressure reduction of packing layer is 150Pa.
4. spray flue gas waste heat recovery as claimed in claim 1 and denitrification integrated device, is characterized in that, ripple packing is selected stainless steel or plastics.
5. spray flue gas waste heat recovery as claimed in claim 1 and denitrification integrated device, it is characterized in that, the flue-gas temperature of smoke inlet (121) is 90 degree, the flue-gas temperature that flue gas is discharged by the exhanst gas outlet (122) by spray packed tower shell body (111) top through filler (13) and shower water heat exchange is 30 degree, simultaneously, nitrogen oxides in effluent and oxysulfide through oxidant oxidation and in filler fully with contain in and alkali substance reaction and the absorption of acidic materials, in flue gas, graininess dust is also absorbed by shower water.
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| CN201410397374.1A CN104162357A (en) | 2014-08-13 | 2014-08-13 | Integrated spray flue gas waste heat recovery and denitration device |
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| CN201410397374.1A CN104162357A (en) | 2014-08-13 | 2014-08-13 | Integrated spray flue gas waste heat recovery and denitration device |
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| CN104162357A true CN104162357A (en) | 2014-11-26 |
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| CN105080245A (en) * | 2015-08-21 | 2015-11-25 | 北京建筑大学 | System and method for integrally recycling condensation heat energy of flue gas with dust and purifying flue gas |
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| CN105944527A (en) * | 2016-07-21 | 2016-09-21 | 北京华源泰盟节能设备有限公司 | Direct-contact type flue gas waste heat deep recycling and pollution reducing device and method |
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Application publication date: 20141126 |