CN204320094U - A kind of smoke eliminator realized based on absorbent pretreatment - Google Patents
A kind of smoke eliminator realized based on absorbent pretreatment Download PDFInfo
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- CN204320094U CN204320094U CN201420741649.4U CN201420741649U CN204320094U CN 204320094 U CN204320094 U CN 204320094U CN 201420741649 U CN201420741649 U CN 201420741649U CN 204320094 U CN204320094 U CN 204320094U
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Abstract
The utility model discloses a kind of smoke eliminator realized based on absorbent pretreatment, comprise the flue gas purification system and SO that are connected with main chimney flue successively
2absorption system, described flue gas purification system is primarily of the auxiliary flue be interconnected and flue collector composition, and described flue collector is communicated in main chimney flue and SO
2absorption system, is provided with impact grinding pulverizing grading machine in described auxiliary flue, and described impact grinding pulverizing grading machine is realize absorbent pulverize and deliver to the gas powder conveying device of flue collector in the lump with auxiliary flue gas.The utility model specially for flue gas thick process for purifying and design, improve the denitrification efficiency of absorbent greatly, to improving the treatment effeciency of follow-up desulfurizing and denitrifying process, there is high facilitation.
Description
Technical field
The utility model is a kind of smoke eliminator realized based on absorbent pretreatment, is specifically related to the pretreatment unit to absorbent realization in flue gas purification method, belongs to stack gas cleaning field.
Background technology
The continuous progress of the industry such as oil and chemical industry is while promoting economic development, also pollution is caused to environment, at present, global pollution problem is on the rise, more cause common concern and the attention of countries in the world, especially the discharge etc. of coal-fired power plant, coal-burning boiler and flue gas of refuse burning, quite serious to the pollution of air, we know, containing a large amount of flue dust, carbon dioxide, SO in coal-fired flue-gas
2and NO
xetc. harmful substance, wherein, the carbon dioxide of fuel combustion discharge is the main matter causing greenhouse effects; SO
2, NO
xand fly ash granule is again the main source of atmosphere pollution; Certainly, the flue dust that the flue gases such as coal-burning boiler produce also is the one of the main reasons causing atmosphere pollution, and its main component is also SO
2and NO
x.It is reported, China about has the city suspended particulates level of 70% to exceed standard, the SO in the peri-urban air of 2/3
2exceed standard, therefore, for improving the air quality of current environment, the improvement of these pollutants is very urgent especially with reduction of discharging.
In China, flue gas desulfurization and denitrification is topmost measure in air contaminant treatment, domestic and international flue gas desulfurization technique is a lot, as limestone-gypsum method, ammonia process, Dual alkali, rotary spraying technique etc., wherein from the desulfur technology of industrialization, though have that floor space is large, operating cost is high, easy blocking, desulfurizing byproduct difficulty put, secondary pollution problems and and be unwell to China's national situation, due to history, what account for absolute leading position is still limestone-gypsum method.And in gas denitrifying technology, then selective catalytic reduction method (SCR), SNCR method (SNCR), electron beam irradiation method, impulse electric corona plasma method, red-hot carbon reduction method, low temperature normal atmosphere plasma decomposition methods etc. are wherein general with SCR method denitration application again.
At present, in the world Application comparison widely flue gas desulfurization and denitrification technology be then utilize above-mentioned traditional flue gas desulfurization technique and SCR denitration technology combined, can the object of desulphurization denitration to reach, although this technology can remove the SO of more than 90%
2with more than 80% NOx, but this method in fact remains combinationally using of independent desulphurization and denitration technology, more have the disadvantage that above-mentioned desulphurization and denitration technology exists concurrently, failed to break away from technological process length, investment is large, operating cost is high, Technical Economy is poor, easily cause secondary pollution problems.From existing patent document CN102489129A(industrial flue gas cleaning denitration integrated device and method of work thereof, 2012.06.13), CN203108424U(mono-kind carries out the flue gas processing device of desulfurization and denitration simultaneously, 2013.08.07) we know, combined desulfurization and denitration technology becomes the developing direction of smoke gas treatment gradually, but the integrated technique of this kind of fume desulfuring and denitrifying is often ripe not enough, for improving the treatment effeciency of follow-up desulfurizing and denitrifying process, usually adopt pretreatment flue to the SO in flue gas in desulfurization process front end
2or NO
xslightly purify, the mode used comprises ozone injection, cooling, absorbent etc., and for example patent document CN102363095A(flue gas dry desulfurizing process and flue gas dry desulfurizing system thereof, 2012.02.29), CN103990375A(semidry method sinter fume integrated purifying method, 2014.08.20) etc., in actual use, its treatment effeciency from the embodiment the technical process of whole desulfurization (denitration) but and not obvious, therefore, their industrial applications also and not obvious.
Utility model content
The purpose of this utility model is to provide a kind of smoke eliminator realized based on absorbent pretreatment, this device specially for flue gas thick process for purifying and design, absorbent is sent into impact grinding pulverizing grading machine by the auxiliary flue gas introduced by auxiliary flue, pretreatment is being carried out to absorbent and while obtaining primary mixture, absorbent is utilized to carry out desulphurization denitration process to auxiliary flue gas, absorbent in the primary mixture obtained has activity because of reaction, mix with the flue gas in flue collector again after being admitted to flue collector and react, improve the denitrification efficiency of absorbent greatly, to the follow-up SO of raising
2the denitrification efficiency of absorption system has high facilitation.
The utility model is achieved through the following technical solutions: a kind of smoke eliminator realized based on absorbent pretreatment, comprises the flue gas purification system and SO that are connected with main chimney flue successively
2absorption system, in traditional flue gas purification system, absorbent is normally ground into absorbent granules by grinding machine system after metering, and then carry out mixing and reacting with former flue gas by dry powder injector feeding flue collector, the denitrification efficiency of absorbent to former flue gas is lower, for improving the operating efficiency of absorbent, flue gas purification system described in the utility model is primarily of the auxiliary flue be interconnected and flue collector composition, and described flue collector is communicated in main chimney flue and SO
2absorption system, impact grinding pulverizing grading machine is provided with in described auxiliary flue, described impact grinding pulverizing grading machine is realize absorbent pulverize and deliver to the gas powder conveying device of flue collector in the lump with auxiliary flue gas, when practical operation, the absorbent of impact grinding pulverizing grading machine is sent into pulverized while with auxiliary flue gas, carry out reacting and obtaining primary mixture with auxiliary flue gas, absorbent in this primary mixture has activity because of reaction, after being sent to flue collector, its denitrification efficiency is also higher, and practical effect is good.
In the utility model, main chimney flue provides the former flue gas coming from and produce in thermal power plant or other industrial production, former flue gas is delivered to flue gas purification system along flue collector, the former flue gas of a part enters auxiliary flue, be called auxiliary flue gas, the former flue gas of another part continues to stay flue collector, be called flue gas, therefore, flue collector described in the utility model is the exhaust gases passes passed through for flue gas, for the abundant mixing that improves primary mixture and flue gas with contact, described flue collector is provided with gas mixer; Described auxiliary flue is the flue gas bypass passageways be connected with flue collector, auxiliary flue outlet end is connected on gas mixer, when reality uses, auxiliary flue gas drives absorbent to enter impact grinding pulverizing grading machine in the lump, absorbent in impact grinding pulverizing grading machine, carry out pretreatment and with auxiliary smoke reaction, the primary mixture obtained delivers to gas mixer through auxiliary flue outlet end, then after carrying out hybrid reaction with the flue gas in flue collector, delivers to SO in the lump
2absorption system.
For better realizing said structure, the utility model is also provided with flue gas booster fan on described flue collector, and the front of auxiliary flue entrance end is located at by this flue gas booster fan.
In the utility model, described SO
2absorption system comprises the absorption tower being provided with spraying layer and the doctor solution circulatory system, described flue collector is connected with absorption tower, the chimney of discharging for purified gas is provided with at the top on absorption tower, the waste liquid comb of discharging for desulfurization slurry is then provided with in the bottom on absorption tower, its concrete operations flow process is as follows: the smoke mixture that primary mixture is formed after being admitted to flue collector and flue gas hybrid reaction sends into absorption tower by flue collector again, spraying layer is arranged in absorption tower, the doctor solution circulatory system is to after circulating pump pressurization, doctor solution is sprayed by the nozzle plenum that spraying layer distributes, and form the larger desulfurization droplet of a large amount of specific areas, on the one hand, smoke mixture enters the middle part on absorption tower, rapid decreasing temperature and increasing humidity in tower, and meet head on to contact with the desulfurization droplet of reverse high-speed motion, there is strong action of turbulent flow, gas, liquid two-phase carries out abundant mass-and heat-transfer, SO in smoke mixture
2absorbed in a large number, on the other hand, absorbent granules in smoke mixture enters after in tower, on equally with gas flow counterflow, contact fully with top-down doctor solution, excessive absorbent granules is dissolved in doctor solution, continues to absorb SO residual in flue gas under the effect of the doctor solution circulatory system with desulfurization slurry at tower Inner eycle
2, NO
yand heavy metallic oxide, SO
2removal efficiency up to 98%, can directly can be discharged by flue after the purified gas after desulfurization reaches discharging standards, desulfurization slurry in cyclic process, owing to constantly absorbing SO
2, after reaching finite concentration, namely deliver to Sewage Disposal by waste liquid comb.
In actual production process, the deployment scenarios of impact grinding pulverizing grading machine can adopt the following two kinds mode to arrange:
One is, described impact grinding pulverizing grading machine comprises the flour mill be located in auxiliary flue, grader and high-pressure suction fan, described flour mill, grader and high-pressure suction fan set gradually along assisting the throughput direction of flue gas, described flour mill is provided with absorbent entrance, auxiliary flue gas sends into flour mill successively along auxiliary flue, grader and high-pressure suction fan, absorbent and auxiliary flue gas are admitted to flour mill, the spatial dispersion of absorbent in flour mill and turbulence, and be broken by the synergy of flour mill and auxiliary flue gas, the absorbent be broken is delivered to grader and is screened under the drive of auxiliary flue gas, part absorbent mixes with flue gas and forms primary mixture, and deliver to gas mixer through high-pressure suction fan, another part absorbent returns flour mill again and proceeds to pulverize.
Absorbent measure control assembly is provided with at described absorbent entrance, described absorbent measure control assembly comprises the absorbent metered dispensing unit be connected successively, absorbent conveying device and absorbent feed bin, described absorbent metered dispensing unit is connected with absorbent entrance, after first absorbent sends into absorbent feed bin, deliver to after absorbent metered dispensing unit through absorbent conveying device again and deliver to flour mill, the metering realizing absorbent is introduced, when practical application, absorbent is usually excessive, simultaneously, also to measure according to the content of pollutant in former flue gas, for former flue gas, its pollutant load is usually at 200 ~ 9000mg/Nm
3scope in, the mixing ratio of absorbent and auxiliary flue gas is 100 ~ 460g/Nm
3, after the pretreatment of impact grinding pulverizing grading machine, the primary mixture of acquisition sends into gas mixer, and absorbent wherein and the mixing ratio of flue gas are 6 ~ 23g/Nm
3.
After high-pressure suction fan is located at grader, high-pressure suction fan is negative-pressure operation, flour mill and grader can be avoided to occur that dust is revealed, but the Wear-resistant Treatment degree of high-pressure suction fan need be improved, therefore, the runner of high-pressure suction fan described in the utility model is that abrasion resistant materials is made, and has the rub proofness increasing high-pressure suction fan and the beneficial effect improving high-pressure suction fan service life.
Another kind is, described impact grinding pulverizing grading machine comprises the high-pressure suction fan be located in auxiliary flue, flour mill and grader, described high-pressure suction fan, flour mill and grader set gradually along assisting the throughput direction of flue gas, described flour mill is provided with absorbent entrance, absorbent then directly delivers to flour mill, the spatial dispersion of absorbent in flour mill and turbulence, and be broken by the synergy of flour mill and auxiliary flue gas, the absorbent be broken is delivered to grader and is screened under the drive of auxiliary flue gas, part absorbent mixes with auxiliary flue gas and forms primary mixture, gas mixer is delivered under the power that high-pressure suction fan provides, another part absorbent returns flour mill again and proceeds to pulverize.
Further, absorbent sends into flour mill by absorbent entrance after metering, absorbent measure control assembly is provided with at described absorbent entrance, described absorbent measure control assembly comprises the absorbent metered dispensing unit, absorbent conveying device and the absorbent feed bin that are connected successively, and described absorbent metered dispensing unit is connected with absorbent entrance.
For flour mill, described flour mill is connected with air duct, also can utilizes the spatial dispersion of air driven absorbent in flour mill and turbulence, the pulverizing of absorbent can be realized equally, operate very flexible.
The utility model compared with prior art, has the following advantages and beneficial effect:
(1) the utility model specially for flue gas thick process for purifying and design, by auxiliary flue gas, absorbent is introduced impact grinding pulverizing grading machine, pretreatment is being carried out to absorbent and while obtaining primary mixture, absorbent is utilized to carry out desulphurization denitration process to auxiliary flue gas, absorbent in primary mixture has activity because of reaction, mix with flue gas again after being admitted to flue collector and react, improve the denitrification efficiency of absorbent greatly, to the treatment effeciency improving follow-up desulfurizing and denitrifying process, there is high facilitation.
(2) the utility model is reasonable in design, flue collector is provided with auxiliary flue, by auxiliary flue gas, absorbent is introduced impact grinding pulverizing grading machine and carry out pretreatment, in the utility model, enter the air-flow of impact grinding pulverizing grading machine for auxiliary flue gas, avoid the concentration and the EGT that adopt other gas to reduce pollutant in waste gas, simultaneously, owing to introducing air-flow for auxiliary flue gas, carrying out pretreated to absorbent while, auxiliary flue gas can also react with absorbent, and make absorbent with activity, be conducive to the denitrification efficiency improving waste gas, in auxiliary flue, the thick purifying rate of waste gas can reach 90 ~ 99%.
(3) the utility model principle is simple, auxiliary flue gas and absorbent are introduced into impact grinding pulverizing grading machine with high-pressure suction fan and carry out fragmentation, the spatial dispersion of absorbent between grader and flour mill and turbulence, and it is broken by the synergy of impact grinding pulverizing grading machine and auxiliary flue gas, crushing efficiency is high, the specific surface area and porosity of the absorbent obtained through pretreatment greatly increases, and in actual use, absorbent is crushed to grain graininess≤40um, pore volume is 0. 0317 m
3/ g, specific area 4.2m
2the particulate of/g.
(4) the auxiliary flue gas that the utility model adopts comes from former flue gas, when reality uses, because the temperature of former flue gas is higher, absorbent is while fragmentation, can react by more effective and auxiliary flue gas, improve the treatment effeciency of absorbent, when reality uses, the temperature entering the auxiliary flue gas of impact grinding pulverizing grading machine can reach 90 ~ 200 DEG C, and practical effect is good.
(5) the impact grinding pulverizing grading machine that the utility model relates to forms primarily of flour mill, grader and high-pressure suction fan, with traditional grinding machine system unlike, the impact grinding pulverizing grading machine that the utility model adopts eliminates traditional whirlwind and the setting of bag collector, avoid the absorbent after pulverizing to reunite, maintain the activity of pretreatment absorbent fully, practicality is extremely strong.
(6) the utility model structure is simple, and the impact grinding pulverizing grading machine related to comprises two kinds and implements operating mode, and one is that high-pressure suction fan adopts positive pressure operation, can avoid pulverizing the wearing and tearing of rear absorbent granules to high-pressure suction fan, reduce the wear-resisting requirement of equipment; Another kind is that high-pressure suction fan adopts negative-pressure operation, flour mill and grader can be avoided to occur that dust is revealed, but need improve the Wear-resistant Treatment degree of high-pressure suction fan.
(7) time for reducing high-pressure suction fan negative-pressure operation, absorbent granules is to the wearing and tearing of high-pressure suction fan, the runner of the high-pressure suction fan that the utility model relates to adopts erosion resistant process, has the rub proofness increasing high-pressure suction fan and the beneficial effect improving high-pressure suction fan service life.
(8) the utility model is also provided with gas mixer on flue collector, this gas mixer can make full and uniform the mixing of the primary mixture of feeding flue collector and flue gas, be conducive to the thick purification of absorbent to flue gas, in flue collector, the primary mixture introduced and the first purifying rate of flue gas can reach 80 ~ 90%, and denitrification efficiency is high.
(9) the utility model flexible operation, flour mill is also provided with air duct, when reality uses, absorbent also can send into flour mill air auxiliary under, spatial dispersion in flour mill and turbulence, and be broken by the synergy of flour mill and auxiliary flue gas.
(10) the utility model principle is simple, in the rough purification process of raising flue while denitrification efficiency, also reduces follow-up SO
2the purification pressure of absorption system, in actual mechanical process, absorption tower is to SO in smoke mixture
2removal efficiency can up to 98%, the desulfurization slurry of the generation in sweetening process is then disposed to Sewage Disposal and processes.
Accompanying drawing explanation
The control schematic diagram that Fig. 1 is structure shown in the utility model.
Fig. 2 is the structural representation on absorption tower described in the utility model.
Structural plan when Fig. 3 is high-pressure suction fan described in the utility model employing positive pressure operation.
Structural plan when Fig. 4 is high-pressure suction fan described in the utility model employing negative-pressure operation.
Wherein 1-flue collector, 2-auxiliary flue, 3-spraying layer, 4-absorption tower, 5-flue, 6-waste liquid comb, 7-circulating pump.
Detailed description of the invention
Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
Embodiment 1:
In traditional flue gas purifying method, absorbent has generally included grinding machine system and dry powder injection apparatus to the device that former flue gas carries out thick purification, absorbent is sent into grinding machine system first after metering and is pulverized, absorbent granules after pulverizing is sent into flue collector 1 by dry powder injector again and is carried out mixing and reacting with former flue gas, in the process, the purification efficiency of absorbent to former flue gas is generally about 50%, desulfuration efficiency is lower, therefore, for improving the operating efficiency of absorbent, the utility model proposes a kind of smoke eliminator realized based on absorbent pretreatment, impact grinding pulverizing grading machine is adopted to replace in conventional smoke gas purifying method the abrasive dust process that absorbent is taked, this impact grinding pulverizing grading machine is realize absorbent pulverize and deliver to the gas powder conveying device of flue collector 1 in the lump with auxiliary flue gas, be arranged in auxiliary flue 2.When practical operation, the former flue gas from main chimney flue is delivered to SO along flue collector 1
2in the process of absorption system, power is provided by flue gas booster fan, former flue gas is shunted after being admitted to flue collector 1 again and is formed auxiliary flue gas and flue gas, the volume ratio of flue gas and auxiliary flue gas is 9:1, absorbent is sent into impact grinding pulverizing grading machine with auxiliary flue gas and is carried out pretreatment, the primary mixture obtained delivers to SO after entering flue collector 1 and flue gas hybrid reaction in the lump
2absorption system, the absorbent of impact grinding pulverizing grading machine is sent into pulverized while with auxiliary flue gas, carry out reacting and obtaining primary mixture with auxiliary flue gas, absorbent in this primary mixture has activity because of reaction, when being sent to flue collector 1 with flue gas hybrid reaction, its denitrification efficiency is also higher, be proven, the thick purifying rate of absorbent to auxiliary flue gas can reach 90 ~ 99%, after primary mixture is sent to flue collector 1, can 80 ~ 90% be reached to the thick purifying rate of the flue gas in flue collector 1, meanwhile, follow-up SO can also be effectively reduced
2the purification pressure of absorption system, it is very reasonable to design.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is: the present embodiment is provided with gas mixer on flue collector 1, primary mixture and flue gas is abundant hybrid reaction in gas mixer, for ensureing the denitrification efficiency of flue gas, in primary mixture, the mixing ratio of absorbent and flue gas should be 6g/Nm
3or 23g/Nm
3.In actual application, to the determination of the absorbent consumption that flour mill is introduced, not only need to detect the total amount of pollutant in former flue gas, also need to detect the total amount of pollutant in flue collector after gas mixer 1, both data common feedback just can complete to the metering control system of absorbent, its control flow as shown in Figure 1, former flue is arranged and is used for former flue gas pollutant, flow, pressure, the former flue gas composition detector of temperature diagnosis, the detection signal of former flue gas pollutant delivers to control system, control system calculates the total amount of pollutants discharge that need process according to former flue gas inspection signal, reset the absorbed dose of radiation needing to add, by absorbent addition Signal transmissions to absorbent metered dispensing unit, absorbent is delivered to flour mill.After cleaning flue is arranged flue gas inspection instrument after the purification of flue gas pollutant after thick purification, flow, pressure, temperature diagnosis, after the purification detected, smoke signal feeds back to control system together with the pulse measurement signal of absorbent metered dispensing unit, and control system to be revised absorbent setting value according to the signal fed back and formed a complete control system.
Embodiment 3:
The difference of the present embodiment and embodiment 1 is: in the present embodiment, SO
2absorption system comprises the absorption tower 4 being provided with spraying layer 3 and the doctor solution circulatory system, as described in Figure 2, flue collector 1 is connected to the middle part on absorption tower 4, the flue of discharging for purified gas is provided with at the top on absorption tower 4, the waste liquid comb 6 of discharging for desulfurization slurry is then provided with in the bottom on absorption tower 4, its concrete operations flow process is as follows: the smoke mixture that primary mixture is formed after being admitted to flue collector 1 and flue gas hybrid reaction sends into absorption tower 4 by flue collector 1 again, spraying layer 3 is arranged in absorption tower 4, such as, three layers of spraying layer 3 are furnished with in absorption tower 4, after the doctor solution circulatory system is pressurizeed to circulating pump 7, the nozzle plenum of doctor solution by distribution on three layers of spraying layer 3 is sprayed, and form the larger desulfurization droplet of a large amount of specific areas, on the one hand, smoke mixture enters the middle part on absorption tower 4, rapid decreasing temperature and increasing humidity in tower, and meet head on to contact with the desulfurization droplet of reverse high-speed motion, there is strong action of turbulent flow, gas, liquid two-phase carries out abundant mass-and heat-transfer, SO in smoke mixture
2absorbed in a large number, on the other hand, absorbent granules in smoke mixture enters after in tower, on equally with gas flow counterflow, contact fully with top-down doctor solution, excessive absorbent granules is dissolved in doctor solution, continues to absorb SO residual in flue gas under the effect of the doctor solution circulatory system with desulfurization slurry at tower Inner eycle
2, NO
yand heavy metallic oxide, the spray mist cone of three layers of nozzle generation can reach more than 200%, SO to the coverage rate in desulfurizing tower cross section
2removal efficiency up to 98%, can directly can be discharged by flue after the purified gas after desulfurization reaches discharging standards, desulfurization slurry in cyclic process, owing to constantly absorbing SO
2, as Na in desulfurization slurry
2sO
4concentration reach 24 ~ 28% after, namely deliver to Sewage Disposal by waste liquid comb 6.In above process, doctor solution can select the mixture that sodium carbonate, sodium sulphate, sodium nitrate form.
Embodiment 4:
The difference of the present embodiment and embodiment 3 is: the present embodiment is applicable to pollutant load at 6000mg/Nm
3the thick purification of the former flue gas in scope, the former flue gas coming from main chimney flue is carried by flue gas booster fan in flue collector 1, and shunting formation volume ratio is the flue gas of 9:1 and auxiliary flue gas, wherein, auxiliary flue gas sends into impact grinding pulverizing grading machine along auxiliary flue 2, and flue gas is then sent to gas mixer along flue collector 1.
As shown in Figure 3, in auxiliary flue 2, be disposed with flour mill, grader and high-pressure suction fan, auxiliary flue gas sends into the flour mill in auxiliary flue 2 along auxiliary flue 2, first absorbent sends into absorbent feed bin, then after absorbent conveying device, absorbent metered dispensing unit is delivered to, flour mill is sent into again after metering, the spatial dispersion of absorbent in flour mill and turbulence, and be broken by the synergy of flour mill and auxiliary flue gas, the absorbent be broken is delivered to grader and is screened under the drive of auxiliary flue gas, regulate grader rotating speed to 800r/min, controlling the granularity of absorbent after pulverizing is 20 ~ 40um, the absorbent of absorbent granules degree > 40um returns flour mill and proceeds to pulverize, meeting granularity is that the absorbent of 20 ~ 40um then mixes with auxiliary flue gas and obtains primary mixture, the object of high-pressure suction fan is as auxiliary flue gas provides power, and make auxiliary flue gas that absorbent can be driven to send into grader from flour mill, the primary mixture obtained also has certain pressure, and feeding gas mixer that can be stable, reacts with flue gas.In the present embodiment, NaHCO selected by absorbent
3, the maximum mixing ratio of its introduction volume and auxiliary flue gas is 160g/Nm
3, the pressure setting of high-pressure suction fan is 12kpa, and this operating pressure part is for overcoming the resistance of flour mill and grader, about 7kpa, another part is the pressure overcoming gas mixer, about 5 kpa, that is: the pressure delivering to the primary mixture of gas mixer is 5 kpa.
Absorbent is after the pretreatment of impact grinding pulverizing grading machine, can 90% be reached to the thick purifying rate of auxiliary flue gas in auxiliary flue 2, the primary mixture obtained is exported by auxiliary flue 2 and delivers to gas mixer with the pressure of 5kpa, mix with the flue gas in flue collector 1, the maximum mixing ratio of the absorbent in primary mixture and flue gas is 15g/Nm
3, after abundant hybrid reaction, the purifying rate of flue gas can reach 90%, without the need to carrying out the separation of gas powder, directly delivers to SO by flue collector 1
2absorption system.
In the present embodiment, for avoiding absorbent granules to the abrasion and corrosion of high-pressure suction fan, the runner of high-pressure suction fan should adopt erosion resistant process, has the rub proofness increasing high-pressure suction fan and the beneficial effect improving high-pressure suction fan service life.
In the present embodiment, SO
2absorption system comprises the absorption tower 4 being provided with spraying layer 3 and the doctor solution circulatory system, as described in Figure 4, flue collector 1 is connected to the middle part on absorption tower 4, the flue 5 of discharging for purified gas is provided with at the top on absorption tower 4, the waste liquid comb 6 of discharging for desulfurization slurry is then provided with in the bottom on absorption tower 4, its concrete operations flow process is as follows: the smoke mixture that primary mixture is formed after being admitted to flue collector 1 and flue gas hybrid reaction sends into absorption tower 4 by flue collector 1 again, spraying layer 3 is arranged in absorption tower 4, such as, three layers of spraying layer 3 are furnished with in absorption tower 4, after the doctor solution circulatory system is pressurizeed to circulating pump 7, the nozzle plenum of doctor solution by distribution on three layers of spraying layer 3 is sprayed, and form the larger desulfurization droplet of a large amount of specific areas, on the one hand, smoke mixture enters the middle part on absorption tower 4, rapid decreasing temperature and increasing humidity in tower, and meet head on to contact with the desulfurization droplet of reverse high-speed motion, there is strong action of turbulent flow, gas, liquid two-phase carries out abundant mass-and heat-transfer, SO in smoke mixture
2absorbed in a large number, on the other hand, absorbent granules in smoke mixture enters after in tower, on equally with gas flow counterflow, contact fully with top-down doctor solution, excessive absorbent granules is dissolved in doctor solution, continues to absorb SO residual in flue gas under the effect of the doctor solution circulatory system with desulfurization slurry at tower Inner eycle
2, NO
yand heavy metallic oxide, the spray mist cone of three layers of nozzle generation can reach more than 200%, SO to the coverage rate in desulfurizing tower cross section
2removal efficiency up to 98%, can directly can be discharged by flue 5 after the purified gas after desulfurization reaches discharging standards, desulfurization slurry in cyclic process, owing to constantly absorbing SO
2, as Na in desulfurization slurry
2sO
4concentration reach 24% after, namely deliver to Sewage Disposal by waste liquid comb 6.In above process, doctor solution can select the mixture that sodium carbonate, sodium sulphate form.
Embodiment 5:
The difference of the present embodiment and embodiment 4 is: the present embodiment is also connected with air duct on flour mill, its object is to: the flexible use of air-flow in handled easily process, when reality uses, absorbent also can send into flour mill external air auxiliary under, spatial dispersion in flour mill and turbulence, and be broken by the synergy of flour mill and auxiliary flue gas.
Embodiment 6:
The present embodiment is applicable to pollutant load at 4000mg/Nm
3scope in the thick purification of former flue gas, the former flue gas coming from main chimney flue is carried by flue gas booster fan in flue collector 1, and shunting forms auxiliary flue gas and flue gas that volume ratio is 19:1, wherein, auxiliary flue gas sends into impact grinding pulverizing grading machine along auxiliary flue 2, and flue gas is then sent to gas mixer along flue collector 1.
As shown in Figure 3, in auxiliary flue 2, be disposed with high-pressure suction fan, flour mill and grader, auxiliary flue gas is sent into successively along auxiliary flue 2 and is assisted high-pressure suction fan in flue 2 and flour mill, first absorbent sends into absorbent feed bin, then after absorbent conveying device, absorbent metered dispensing unit is delivered to, flour mill is sent into again after metering, the spatial dispersion of absorbent in flour mill and turbulence, and be broken by the synergy of flour mill and auxiliary flue gas, the absorbent be broken is delivered to grader and is screened under the drive of auxiliary flue gas, regulate grader rotating speed to 1000r/min, controlling the granularity of absorbent after pulverizing is 10 ~ 40um, the absorbent of absorbent granules degree > 40um returns flour mill and proceeds to pulverize, meeting granularity is that the absorbent of 10 ~ 40um then mixes with auxiliary flue gas and obtains primary mixture, the object of high-pressure suction fan is as auxiliary flue gas provides power, and make auxiliary flue gas that absorbent can be driven to send into grader from flour mill, the primary mixture obtained also has certain pressure, and feeding gas mixer that can be stable, reacts with flue gas.In the present embodiment, Na selected by absorbent
2cO
3, the maximum mixing ratio of its introduction volume and auxiliary flue gas is 220 g/Nm
3, the pressure setting of high-pressure suction fan is 13kpa, and this operating pressure part is for overcoming the resistance of flour mill and grader, about 8kpa, another part is the pressure overcoming gas mixer, about 5kpa, that is: the pressure delivering to the primary mixture of gas mixer is 5 kpa.
Absorbent is after the pretreatment of impact grinding pulverizing grading machine, can 99% be reached to the thick purifying rate of auxiliary flue gas in auxiliary flue 2, the primary mixture obtained is exported by auxiliary flue 2 and delivers to gas mixer with the pressure of 5kpa, mix with the flue gas in flue collector 1, the maximum mixing ratio of the absorbent in primary mixture and flue gas is 11g/Nm
3, after abundant hybrid reaction, the purifying rate of flue gas can reach 80%, without the need to carrying out the separation of gas powder, directly delivers to SO by flue collector 1
2absorption system.
In the present embodiment, SO
2absorption system comprises the absorption tower 4 being provided with spraying layer 3 and the doctor solution circulatory system, as described in Figure 4, flue collector 1 is connected to the middle part on absorption tower 4, the flue 5 of discharging for purified gas is provided with at the top on absorption tower 4, the waste liquid comb 6 of discharging for desulfurization slurry is then provided with in the bottom on absorption tower 4, its concrete operations flow process is as follows: the smoke mixture that primary mixture is formed after being admitted to flue collector 1 and flue gas hybrid reaction sends into absorption tower 4 by flue collector 1 again, spraying layer 3 is arranged in absorption tower 4, such as, three layers of spraying layer 3 are furnished with in absorption tower 4, after the doctor solution circulatory system is pressurizeed to circulating pump 7, the nozzle plenum of doctor solution by distribution on three layers of spraying layer 3 is sprayed, and form the larger desulfurization droplet of a large amount of specific areas, on the one hand, smoke mixture enters the middle part on absorption tower 4, rapid decreasing temperature and increasing humidity in tower, and meet head on to contact with the desulfurization droplet of reverse high-speed motion, there is strong action of turbulent flow, gas, liquid two-phase carries out abundant mass-and heat-transfer, SO in smoke mixture
2absorbed in a large number, on the other hand, absorbent granules in smoke mixture enters after in tower, on equally with gas flow counterflow, contact fully with top-down doctor solution, excessive absorbent granules is dissolved in doctor solution, continues to absorb SO residual in flue gas under the effect of the doctor solution circulatory system with desulfurization slurry at tower Inner eycle
2, NO
yand heavy metallic oxide, the spray mist cone of three layers of nozzle generation can reach more than 200%, SO to the coverage rate in desulfurizing tower cross section
2removal efficiency up to 98%, can directly can be discharged by flue 5 after the purified gas after desulfurization reaches discharging standards, desulfurization slurry in cyclic process, owing to constantly absorbing SO
2, as Na in desulfurization slurry
2sO
4concentration reach 28% after, namely deliver to Sewage Disposal by waste liquid comb 6.In above process, doctor solution can select the mixture that sodium carbonate forms.
Embodiment 7:
The difference of the present embodiment and embodiment 6 is: the present embodiment is also connected with air duct on flour mill, its object is to: the flexible use of air-flow in handled easily process, when reality uses, absorbent also can send into flour mill external air auxiliary under, spatial dispersion in flour mill and turbulence, and be broken by the synergy of flour mill and auxiliary flue gas.
The above; it is only preferred embodiment of the present utility model; not do any pro forma restriction to the utility model, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present utility model, all falls within protection domain of the present utility model.
Claims (10)
1., based on the smoke eliminator that absorbent pretreatment realizes, comprise the flue gas purification system and SO that are connected with main chimney flue successively
2absorption system, is characterized in that: described flue gas purification system is primarily of the auxiliary flue (2) be interconnected and flue collector (1) composition, and described flue collector (1) is communicated in main chimney flue and SO
2absorption system, is provided with impact grinding pulverizing grading machine in described auxiliary flue (2), and described impact grinding pulverizing grading machine is pulverized for realizing absorbent and delivers to the gas powder conveying device of flue collector (1) in the lump with auxiliary flue gas.
2. a kind of smoke eliminator realized based on absorbent pretreatment according to claim 1, is characterized in that: described flue collector (1) is the exhaust gases passes passed through for flue gas, and described flue collector (1) is provided with gas mixer; Described auxiliary flue (2) is the flue gas bypass passageways be connected with flue collector (1), and auxiliary flue (2) port of export is connected on gas mixer.
3. a kind of smoke eliminator realized based on absorbent pretreatment according to claim 2, is characterized in that: on described flue collector (1), be also provided with flue gas booster fan, the front of auxiliary flue (2) arrival end is located at by this flue gas booster fan.
4. a kind of smoke eliminator realized based on absorbent pretreatment according to claim 2, is characterized in that: described SO
2absorption system comprises the absorption tower (4) being provided with spraying layer (3) and the doctor solution circulatory system, described flue collector (1) is connected with absorption tower (4), be provided with the flue (5) of discharging for purified gas at the top of absorption tower (4), be then provided with the waste liquid comb (6) of discharging for desulfurization slurry in the bottom of absorption tower (4).
5. a kind of smoke eliminator realized based on absorbent pretreatment according to any one of Claims 1 to 4, it is characterized in that: described impact grinding pulverizing grading machine comprises flour mill, grader and the high-pressure suction fan be located in auxiliary flue (2), described flour mill, grader and high-pressure suction fan set gradually along the throughput direction of auxiliary flue gas, and described flour mill is provided with absorbent entrance.
6. a kind of smoke eliminator realized based on absorbent pretreatment according to claim 5, it is characterized in that: be provided with absorbent measure control assembly at described absorbent entrance, described absorbent measure control assembly comprises the absorbent metered dispensing unit, absorbent conveying device and the absorbent feed bin that are connected successively, and described absorbent metered dispensing unit is connected with absorbent entrance.
7. a kind of smoke eliminator realized based on absorbent pretreatment according to claim 5, is characterized in that: the runner of described high-pressure suction fan is that abrasion resistant materials is made.
8. a kind of smoke eliminator realized based on absorbent pretreatment according to any one of Claims 1 to 4, it is characterized in that: described impact grinding pulverizing grading machine comprises high-pressure suction fan, flour mill and the grader be located in auxiliary flue (2), described high-pressure suction fan, flour mill and grader set gradually along the throughput direction of auxiliary flue gas, and described flour mill is provided with absorbent entrance.
9. a kind of smoke eliminator realized based on absorbent pretreatment according to claim 8, it is characterized in that: be provided with absorbent measure control assembly at described absorbent entrance, described absorbent measure control assembly comprises the absorbent metered dispensing unit, absorbent conveying device and the absorbent feed bin that are connected successively, and described absorbent metered dispensing unit is connected with absorbent entrance.
10. a kind of smoke eliminator realized based on absorbent pretreatment according to any one of claim 6,7,9, is characterized in that: on described flour mill, be connected with air duct.
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