Summary of the invention
The object of this invention is to provide the system of particle content after a kind of comparatively simple, practical reduction flue gas desulfurization, to solve the problem of desulphurization system outlet containing larger concentration of particles thing.
For achieving the above object, the present invention is by the following technical solutions:
A kind of system reducing particle content after flue gas desulfurization, comprise desulfurizing tower and the second slurry pool, the first slurry pool is provided with bottom desulfurizing tower, desulfurizing tower bottom offers smoke inlet, be positioned in desulfurizing tower above smoke inlet is desulphurization stage, desulphurization stage is divided at least two sections, and be first connected the first slurry pool with the leading portion desulphurization stage of smoke contacts by the circulating pump of first paragraph, final stage desulphurization stage connects the second slurry pool by the circulating pump of second segment; Be provided with the first demister above desulphurization stage, the first demister is connected with spraying section, and spraying section connects the second demister, and the second demister top arranges exhanst gas outlet; Also comprise the 3rd slurry pool, described 3rd slurry pool is connected with spraying section by the 3rd circulating pump.
Further, be filled with desulfurizer slurry in described first slurry pool, the second slurry pool, the second slurry pool gets liquid by the first slurry pool, is provided with particulate matter removing device between the two; 3rd slurry pool is connected with device for smoke pollutants.
Further, the concentration of the slurries in described first slurry pool, the second slurry pool, the 3rd slurry pool reduces successively.
Further, described particulate matter removing device, device for smoke pollutants are filter, settling tank, clarifier, hydrocyclone, one or several combinations in the devices such as stripping air lift pond, neutralization pond.
Further, described spraying section and the second demister and desulphurization stage are arranged in whole desulfurizing tower in the lump.
Further, described second demister is positioned at above spraying section.
Further, described spraying section is provided with funnelform device for storing liquid, and the second slurry pool is positioned at outside desulfurizing tower, and device for storing liquid lower end is provided with return duct, is communicated to the second slurry pool.
Further, described spraying section and the second demister are arranged on outside desulfurizing tower.
Further, described second demister is arranged on the top of spraying section or the side of spraying section.
Further, the second slurry pool is set below spraying section.
Further, described second demister is arranged on the side of spraying section, is provided with baffle plate therebetween, establishes and leave exhaust gases passes between baffle plate and the second slurry pool.
Another object of the present invention is to provide a kind of technique reducing particle content after flue gas desulfurization, and technical scheme is as follows:
Reduce a technique for particle content after flue gas desulfurization, former flue gas enters desulfurizing tower from smoke inlet, and flue gas removes SO through desulphurization stage
2, wherein adopting the slurries of high concentration at the leading portion of desulphurization stage, containing being 5 ~ 35% admittedly, at back segment, adopting low concentration slurries, containing solid≤5%; Back segment low concentration droplet also traps the leading portion high concentration droplet entering back segment while desulfurization, and the particle concentration entered in the droplet of first demister is reduced; Under identical demisting efficiency, the particle concentration of first demister outlet declines; Flue gas enters the first demister, after removing the desulfurization slurry droplet of greater particle size in flue gas, fine mist containing fine particle thing enter into spraying section with flue gas, be tens of clean droplets to hundreds of microns by spraying into particle diameter in flue gas, in order to catch fine mist in flue gas and fine particulates, flue gas after spraying purification enters into the second demister, discharges after removing the fine particulates in flue gas further.
Further, in the first demister removal flue gas, the particle diameter of the desulfurization slurry droplet of greater particle size is greater than 10 ~ 20 microns; The particle diameter of the fine particulates that spraying section catches in flue gas is less than 20 microns.
Further, be fresh water (FW) in described 3rd slurry pool, can be added with activating agent, flocculant, wherein fine particulates content is lower than 5%.
Principle of the present invention is: because the demisting efficiency of existing demister is limited, especially the fine particulates that removal particle diameter is less than 10 microns is difficult to, therefore the small particle diameter droplet meeting entrainment portions particle by escaping in the flue gas after demister, desulphurization stage is divided at least two sections for this reason, back segment adopts the desulfurizer slurry of lower concentration, increase at least one section of spraying-demister system simultaneously, in flue gas, spray into tens of droplet to hundreds of microns catch nanometer, micron-sized fine particulates, because the mist droplet particle size sprayed into is much larger than the particle be captured, when droplet contacts with particle, particle is just easily caught by droplet, spraying section adopts more clean slurries, so flue gas after spraying section in the droplet that carries particle content lower, again by the second demister, large droplet is easily removed by demister, and the fine particulates content in discharge flue gas can significantly be reduced.
The invention has the beneficial effects as follows: 1) system construction is simple, no matter is grassroot project or old project reconstruction, increase engineering cost that all can not be too much; 2) significantly can reduce the fine particulates content in discharge flue gas, thus avoid desulphurization system to the pollution of surrounding enviroment.
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.
A kind of system reducing particle content after flue gas desulfurization, comprise desulfurizing tower and the second slurry pool, the first slurry pool is provided with bottom desulfurizing tower, desulfurizing tower bottom offers smoke inlet, be positioned in desulfurizing tower above smoke inlet is desulphurization stage, desulphurization stage is divided at least two sections, and be first connected the first slurry pool with the leading portion desulphurization stage of smoke contacts by the first circulating pump, final stage desulphurization stage connects the second slurry pool by the second circulating pump; Be provided with the first demister above desulphurization stage, the first demister is connected with spraying section, and spraying section connects the second demister, and the second demister top arranges exhanst gas outlet; Also comprise the 3rd slurry pool, described 3rd slurry pool is connected with spraying section by the 3rd circulating pump.
Embodiment 1
As Fig. 1, desulfurization method of limestone-gypsum system, comprise desulfurizing tower 10, the first slurry pool 101 is provided with bottom desulfurizing tower 10, desulfurizing tower 10 bottom offers smoke inlet 108, be positioned in desulfurizing tower 10 above smoke inlet 1087 is desulphurization stage 102, desulphurization stage 102 is divided at least two sections, the first paragraph of the desulphurization stage 102 leading portion desulphurization stage of smoke contacts (first with) is connected the first slurry pool 101 by the circulating pump 114 of first paragraph, and desulphurization stage 102 final stage connects the second slurry pool 110 by the circulating pump 115 of second segment; Be provided with the first demister 103, first demister 103 above desulphurization stage 102 and be connected with spraying section 104, spraying section 104 connects the second demister 105, second demister 105 top and arranges exhanst gas outlet 106; Also comprise the 3rd slurry pool the 111, three slurry pool 111 to be connected with spraying section by the 3rd circulating pump 116.
3rd slurry pool 111 is connected with device for smoke pollutants 112, and device for smoke pollutants 112 connects the first slurry pool 101; Spraying section 104 is provided with funnelform device for storing liquid 113, second slurry pool 110 and the 3rd slurry pool 111 is positioned at outside desulfurizing tower 10, and device for storing liquid 113 lower end is provided with return duct 107, is communicated to the 3rd slurry pool 111.
Be filled with desulfurizer slurry in first slurry pool 101, second slurry pool 110, the second slurry pool 110 gets liquid by the first slurry pool 101, is provided with particulate matter removing device 109 between the two, and particulate matter removing device 109 adopts hydrocyclone; 3rd slurry pool 111 is connected with device for smoke pollutants, and device for smoke pollutants 112 adopts filter.
The concentration of the slurries in the first slurry pool 101, second slurry pool 110, the 3rd slurry pool 111 reduces successively.
Desulfurizing tower bottom is desulfurization slurry pond, and former flue gas enters desulfurizing tower 10 from smoke inlet 108, in desulphurization stage 102, and SO in flue gas
2react with desulfurization slurry and be removed, the slurries of high concentration are wherein adopted at the leading portion of desulfurization section, containing is 5 ~ 35% admittedly, at back segment, adopt low concentration slurries, containing solid≤5%, back segment low concentration droplet also traps the leading portion high concentration droplet entering back segment while desulfurization, and the particle concentration entered in the droplet of first demister is reduced, flue gas continues up, carry a large amount of desulfurization slurry droplet that contains and enter the first demister 103, first demister 103 efficiency is for being greater than 90%, to remove the droplet that particle diameter is more than or equal to 10 ~ 20 microns, the main droplet containing gypsum containing escaping in flue gas after first time demist, also comprise part agstone slurries, flyash is at interior fine particulates, spray comparatively clean droplet by spraying section 104 to be removed, the droplet of sprinkling is collected and is back in the 3rd slurry pool 111 by device for storing liquid 113, 3rd slurry pool 111 continues to provide spray water to spraying section 104 by the 3rd circulating pump 116, meanwhile, the 3rd slurry pool 111 connects device for smoke pollutants 112, is discharged in time by the particle in slurries, and filtrate is discharged or entered desulfurizing tower 10 as system water supplement.3rd slurry pool 111 carries out moisturizing by external technique water pipe.The second demister 105 is advanced on the flue gas of spraying section, after removing a large amount of droplets of spraying section generation, neat stress discharges system by exhanst gas outlet 106, now still contain a small amount of fine mist in flue gas, but the desulfurizing agent contained in droplet and fume amount are controlled, the pollution to surrounding environment after discharging can be avoided.
Embodiment 2
As Fig. 2, limestone-gypsum desulphurization system, comprise desulfurizing tower 20, the first slurry pool 201 is provided with bottom desulfurizing tower 20, desulfurizing tower 20 bottom offers smoke inlet 208, be positioned in desulfurizing tower 20 above smoke inlet 208 is desulphurization stage 202, desulphurization stage 202 is divided at least two sections, the first paragraph of the desulphurization stage 202 leading portion desulphurization stage of smoke contacts (first with) is connected the first slurry pool 201 by the circulating pump 214 of first paragraph, and desulphurization stage 202 final stage connects the second slurry pool 210 by the circulating pump 215 of second segment; The first demister 203 is provided with above desulphurization stage 202, first demister 203 is connected with spraying section 204, spraying section 204 connects the second demister 205, spraying section 204 and the second demister 205 are positioned at outside desulfurizing tower 20, second demister 205 is positioned at above spraying section 204, and the second demister 205 top arranges exhanst gas outlet 206; Be connected with the 3rd slurry pool the 211, three slurry pool 211 below spraying section 204 to be connected with spraying section 204 by the 3rd circulating pump 216; 3rd slurry pool 211 is connected with device for smoke pollutants 212, and device for smoke pollutants 212 connects the first slurry pool 201.
Be filled with desulfurizer slurry in first slurry pool 201, second slurry pool 210, the second slurry pool 210 gets liquid by the first slurry pool 201, is provided with particulate matter removing device 209 between the two, and particulate matter removing device 209 adopts hydrocyclone; 3rd slurry pool is connected with device for smoke pollutants, and pollutant removing 212 is filter.
The concentration of the slurries in the first slurry pool 201, second slurry pool 210, the 3rd slurry pool 211 reduces successively.
Desulfurizing tower bottom is desulfurization slurry pond, and former flue gas enters desulfurizing tower 20 from smoke inlet 208, in desulphurization stage 202, and SO in flue gas
2react with desulfurization slurry and be removed, the slurries of high concentration are wherein adopted at the leading portion of desulfurization section, containing is 5 ~ 35% admittedly, at back segment, adopt low concentration slurries, containing solid≤5%, back segment low concentration droplet also traps the leading portion high concentration droplet entering back segment while desulfurization, and the particle concentration entered in the droplet of first demister is reduced, flue gas continues up, carry a large amount of desulfurization slurry droplet that contains and enter the first demister 203, first demister 203 efficiency is for being greater than 90%, to remove the droplet that particle diameter is more than or equal to 10 ~ 20 microns, the main droplet containing gypsum containing escaping in flue gas after first time demist, also comprise part agstone slurries, flyash is at interior fine particulates, spray comparatively clean droplet by spraying section 204 to be removed, the droplet sprayed directly falls into the 3rd slurry pool 211, 3rd slurry pool 211 continues to provide spray water to spraying section 204 by the 3rd circulating pump 216, meanwhile, the 3rd slurry pool 211 connects device for smoke pollutants 212, is discharged in time by the particle in slurries, and filtrate enters desulfurizing tower 20 as system water supplement.3rd slurry pool 211 carries out moisturizing by external technique water pipe.The second demister 205 is advanced on the flue gas of spraying section, after removing a large amount of droplets of spraying section generation, neat stress discharges system by exhanst gas outlet 206, now still contain a small amount of fine mist in flue gas, but the desulfurizing agent contained in droplet and fume amount are controlled, the pollution to surrounding environment after discharging can be avoided.
Embodiment 3
As Fig. 3, limestone-gypsum desulphurization system, comprise desulfurizing tower 30, the first slurry pool 301 is provided with bottom desulfurizing tower 30, desulfurizing tower 30 bottom offers smoke inlet 307, be positioned in desulfurizing tower 30 above smoke inlet 307 is desulphurization stage 302, desulphurization stage 302 is divided at least two sections, the first paragraph of the desulphurization stage 302 leading portion desulphurization stage of smoke contacts (first with) is connected the first slurry pool 301 by the circulating pump 314 of first paragraph, and desulphurization stage 302 final stage connects the second slurry pool 310 by the circulating pump 315 of second segment; The first demister 303 is provided with above desulphurization stage 302, first demister 303 is connected with spraying section 304, spraying section 304 connects the second demister 305, spraying section 304 and the second demister 305 are positioned at outside desulfurizing tower 30, second demister 305 is positioned at spraying section 304 side, be provided with baffle plate 317 between second demister 305 and spraying section 304, establish between baffle plate 317 and the second slurry pool and leave exhaust gases passes 318; Second demister 305 top arranges exhanst gas outlet 306; Be connected with the 3rd slurry pool the 311, three slurry pool 311 below spraying section 304 to be connected with spraying section 304 by the 3rd circulating pump 316; 3rd slurry pool 311 is connected with device for smoke pollutants 312, and device for smoke pollutants 312 connects the first slurry pool 301.
Be filled with desulfurizer slurry in first slurry pool 301, second slurry pool 310, the second slurry pool 310 gets liquid by the first slurry pool 301, is provided with particulate matter removing device 309 between the two, and particulate matter removing device 309 adopts hydrocyclone; 3rd slurry pool is connected with device for smoke pollutants, and device for smoke pollutants 312 is filter.
The concentration of the slurries in the first slurry pool 301, second slurry pool 310, the 3rd slurry pool 311 reduces successively.
Desulfurizing tower bottom is desulfurization slurry pond, and former flue gas enters desulfurizing tower 30 from smoke inlet 308, in desulphurization stage 302, and SO in flue gas
2react with desulfurization slurry and be removed, the slurries of high concentration are wherein adopted at the leading portion of desulfurization section, containing is 5 ~ 35% admittedly, at back segment, adopt low concentration slurries, containing solid≤5%, back segment low concentration droplet also traps the leading portion high concentration droplet entering back segment while desulfurization, and the particle concentration entered in the droplet of first demister is reduced, flue gas continues up, carry a large amount of desulfurization slurry droplet that contains and enter the first demister 303, first demister 303 efficiency is for being greater than 90%, to remove the droplet that particle diameter is more than or equal to 10 ~ 20 microns, the main droplet containing gypsum containing escaping in flue gas after first time demist, also comprise part agstone slurries, flyash is at interior fine particulates, spray comparatively clean droplet by spraying section 304 to be removed, the droplet sprayed directly drops down onto in the 3rd slurry pool 311, 3rd slurry pool 311 continues to provide spray water to spraying section 304 by the 3rd circulating pump 316, meanwhile, the 3rd slurry pool 311 connects device for smoke pollutants 312, is discharged in time by the particle in slurries, and filtrate is discharged or entered desulfurizing tower 30 as system water supplement.3rd slurry pool 311 carries out moisturizing by external technique water pipe.Through spraying section flue gas downwards through passage 318 be folded to backward on enter the second demister 305, due to effect of inertia, at passage 318 place, part is removed containing the droplet of particle and enters the 3rd slurry pool 311.After second demister 305 removal spraying section is left part droplet, neat stress discharges system by exhanst gas outlet 306, now still contain a small amount of fine mist in flue gas, but the desulfurizing agent contained in droplet and fume amount are controlled, the pollution to surrounding environment after discharging can be avoided.