CN205760545U - Three circulating flue gas desulfurization tower or the systems for wet ammonia process desulfurizing - Google Patents

Three circulating flue gas desulfurization tower or the systems for wet ammonia process desulfurizing Download PDF

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CN205760545U
CN205760545U CN201620410593.3U CN201620410593U CN205760545U CN 205760545 U CN205760545 U CN 205760545U CN 201620410593 U CN201620410593 U CN 201620410593U CN 205760545 U CN205760545 U CN 205760545U
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serosity
spraying layer
layer
pipeline
serum
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蒲龙映
聂海波
罗启贵
杨贤友
杨波
张宇斌
古志中
邓俊
敬玲梅
邓攀
余珂莹
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Sichuan Junhe Environmental Protection Co Ltd
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Sichuan Junhe Environmental Protection Co Ltd
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Abstract

This utility model relates to field of Environment Protection, discloses a kind of three circulating flue gas desulfurization tower or systems for wet ammonia process desulfurizing, and this fume desulfurizing tower or system include first order uptake zone, uptake zone, the second level and scrubbing section;Described first order uptake zone is correspondingly arranged on the first serum recycle loop;Described uptake zone, the second level is correspondingly arranged on the second serum recycle loop;Described scrubbing section is correspondingly arranged on the 3rd serum recycle loop.This utility model is divided into three independent closed circuits, and each closed circuit controls variable concentrations respectively, flue gas is processed by the serosity of pH value, solves high desulfurization efficiency and the implacable contradiction of by-product high oxidation rate.

Description

Three circulating flue gas desulfurization tower or the systems for wet ammonia process desulfurizing
Technical field
This utility model relates to field of Environment Protection, particularly relates to a kind of three circulating flue gas desulfurization tower or systems.
Background technology
In " coal electricity energy-saving and emission-reduction upgrading with transformation action plan " (2014-2020) that National Development and Reform Commission, Environmental Protection Department and National Energy Board print and distribute for 2014 " (four) keep under strict control Air Pollutant Emission.Newly-built Thermal generation unit (be contained in and build the unit having included country's construction of fire and electricity planning with project in) answers synchronized construction advanced person's high-efficiency desulfurization, denitration and dust removal installation, must not arrange gas bypass.Eastern region (11 provinces and cities) newly-built Thermal generation unit Air Pollutant Emission concentration basically reaches gas turbine group emission limit (i.e. under the conditions of benchmark oxygen content 6%, flue dust, sulfur dioxide, discharged nitrous oxides concentration are respectively no higher than 5,35,50 milligrams/cubic metre), middle part (8 province) new-built unit, in principle close to or up gas turbine group emission limit, encourages west area new-built unit close to or up gas turbine group emission limit.Support that the removing of atmosphere pollution combination and cooperation is carried out in synchronization, reduce the pollutant emissions such as sulfur trioxide, hydrargyrum, arsenic.”
Fume desulfurating absorption tower is the device of most critical in flue gas desulfurization technique.The reasonability of absorption tower structure design is directly connected to desulfuration efficiency, sorbent utilization, sub-salt oxidation efficiency and the height of plant energy consumption.In wet type desulfurizing technique, owing to containing more solid matter in serosity, easy fouling, deposition, therefore use sprays void towers more.The feature of spray void tower is that system is less scaling, blocks, flue gas pressure drop is little, but the flue-gas temperature entering desulfurizing tower is higher (in the case of not setting GGH, flue-gas temperature is general >=and 130 DEG C), the absorption of flue gas cool-down and sulfur dioxide same region in desulfurizing tower is carried out, on the one hand flue-gas temperature height is unfavorable for the serosity absorption to sulfur dioxide, on the other hand cyclic absorption serum density is higher, slurry viscosity is big, it is unfavorable for gas-liquid mass transfer, in order to obtain preferable desulfuration efficiency, being necessary for realizing by increase liquid-gas ratio, this just considerably increases the operation power consumption of desulphurization system.
In wet ammonia process desulfurizing technology, the main path that aerosol produces has two kinds: one to be that the gaseous ammonia that ammonia volatilizees reacts, by gas phase, aerosol particles such as generating ammonium sulfite, bisulfite ammonia, ammonium sulfate with the sulfur dioxide in flue gas.This reaction depends primarily on the concentration of ammonia in flue gas and sulfur dioxide, wherein gaseous state ammonia amount is relevant with ammonia concn and temperature thereof, the ammonia evaporated from ammonia along with the raising of ammonia concn and temperature increases, and the ammonia density in gas phase increases, and the aerosol particle of generation also can increase therewith;Two is that the doctor solution after ammonia absorption sulfur dioxide in flue gas drops in high-temperature flue gas, and owing to evaporation separates out solid granulates, this mechanism exists relatively Important Relations with flue gas and ammonia doctor solution temperature.Its influence factor mainly has flue-gas temperature, ammonia concn, liquid-gas ratio, pH value etc..In wet ammonia process desulfurizing technology, the actual escape referring to ammonia, ammonium sulfite, ammonium bisulfite, ammonium sulfate of the escaping of ammonia.The principal element affecting the escaping of ammonia is input gas temperature, absorbing liquid pH value, concentration and liquid-gas ratio etc..Therefore for wet ammonia process desulfurizing technology, if increasing liquid-gas ratio can increase above-mentioned aerocolloidal generation and the increase of amount of ammonia slip.
It addition, in traditional spray void tower, for wet ammonia process desulfurizing, often there is problems:
(1) in traditional spray void tower, for improving sulfur dioxide removal rate, generally requiring and select bigger liquid-gas ratio, cause the increase of amount of ammonia slip and produce more aerosol, this is in operation is uneconomic, is the most also not allowed to.
(2) in traditional spray void tower, design desulfuration efficiency is more than 95%, but in actual moving process, desulfuration efficiency often only has 80%-90%, less than design load.
(3) in traditional spray void tower, flue gas often skewness in tower, cause in absorption tower exhaust gas volumn in partial cross section bigger, in the case of sprayed slurry amount is certain, removal rate of sulfur dioxide is relatively low, only 80%-95%, it is impossible to meet the environmental protection new demand of existing minimum discharge.
(4), in traditional spray void tower, the serosity (15%-20%) of a kind of concentration, in order to obtain enough serosity time of staying (the solids time of staying >=15h), the serum density of operation is general the highest (1070-1100Kg/m).Entrance dry flue gas becomes saturated wet flue gas after spray-absorption, and carries substantial amounts of serosity, and owing to the density of serosity is higher, the workload causing demister is relatively big, and therefore the risk of fouling and clogging also can be the biggest.
(5) in traditional spray void tower, rising along with serum density is more difficult from by the oxidation of intermediate product ammonium sulfite, run under the conditions of higher serum density, the oxidation effectiveness of ammonium sulfite is poor, also can wrap some unreacteds desulfurizing agent completely in the ammonium sulfate serosity simultaneously discharged, these all can directly affect the quality of by-product.
(6) in traditional spray void tower, in order to improve the desulfuration efficiency of sulfur dioxide, slurry pH value general control higher, for pH 5.0-6.0, often ignore the oxidation of by-product and lower ph 4.0-5.0 that crystallization needs.
At present, country's raising to coal-burning boiler emission standards for sulfur dioxide, traditional spray void tower wet ammonia process desulfurizing technology can not meet environmental requirement.Therefore, it is necessary to technically it is transformed, to adapt to new environmental requirement.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of three circulating flue gas desulfurization tower or systems for wet ammonia process desulfurizing, this desulfurizing tower or system first pass through high concentration, flue gas is processed by the serosity of low ph value, to ensure oxidation and the crystalline environment of by-product, processed continuing flue gas by the serosity of low concentration, high ph-values again, to improve the desulfuration efficiency of sulfur dioxide, it is ensured that desulfuration efficiency is more than 95%.
This utility model solves its technical problem and be the technical scheme is that and provide a kind of three circulating flue gas desulfurization towers for wet ammonia process desulfurizing, the gas approach of this desulfurizing tower is arranged less than exhanst gas outlet, is disposed with first order uptake zone, uptake zone, the second level and scrubbing section between described gas approach to exhanst gas outlet;
Described first order uptake zone is correspondingly arranged on the first serum recycle loop, and the first serum recycle loop includes the first serosity spraying layer and the first slurry circulating pump;The first described serosity spraying layer is laterally distributed in desulfurizing tower;The import of described first slurry circulating pump is connected with the bottom of first order uptake zone by pipeline, exports and is connected by pipeline and the first serosity spraying layer;
Described uptake zone, the second level is correspondingly arranged on the second serum recycle loop, and the second serum recycle loop includes the second serosity spraying layer, the first airflow uniform distribution device, the first serum pot and the second slurry circulating pump;The second described serosity spraying layer is laterally distributed in desulfurizing tower;The first described airflow uniform distribution device is laterally distributed in the lower section of the second serosity spraying layer;The first described airflow uniform distribution device passes through pipeline and the inlet communication of the first serum pot, and the outlet of the first serum pot is connected by pipeline and the second serosity spraying layer;The second described slurry circulating pump is arranged on the pipeline between the first serum pot and the second serosity spraying layer;
Described scrubbing section is correspondingly arranged on the 3rd serum recycle loop, and the 3rd serum recycle loop includes that the 3rd serosity follows spraying layer, the second airflow uniform distribution device, the second serum pot and the 3rd slurry circulating pump;The 3rd described serosity follows spraying layer and is laterally distributed in desulfurizing tower;The second described airflow uniform distribution device is laterally distributed in the 3rd serosity and follows the lower section of spraying layer;Described second airflow uniform distribution device passes through pipeline and the inlet communication of the second serum pot, and the outlet of the second serum pot follows spraying layer by pipeline and the 3rd serosity and connects;On the pipeline that the 3rd described slurry circulating pump is arranged at the second serum pot and the 3rd serosity follows between spraying layer.
The flue gas entered in desulfurizing tower can be lowered the temperature and humidify by the serosity in above-mentioned first serum recycle loop, flue-gas temperature can be reduced to 50 DEG C-60 DEG C in a short period of time, the high temperature of flue gas can also make serosity concentrate simultaneously, it is simple to bisulfite ammonia, the formation of ammonium sulfite crystal;The desulfuration efficiency in the first serum recycle loop is about 30%-50%;After the serosity of the first serosity spraying layer ejection falls the slurry pool bottom first order uptake zone, it is pumped to the first serosity spraying layer ejection by the first serum recycle again, recycles.
In above-mentioned second serum recycle loop, after the serosity that the sulfur dioxide in flue gas after cooling and humidification is sprayed by the second serosity spraying layer absorbs, fall into the first airflow uniform distribution device, after entering the first serum pot by pipeline self, it is pumped to the second serosity spraying layer ejection by the second serum recycle again, recycles.
In above-mentioned 3rd serum recycle loop, the 3rd serosity follows spraying layer and acts primarily as cleaning function, is used for preventing the second airflow uniform distribution device fouling;3rd serosity follow spraying layer ejection serosity fall into the second airflow uniform distribution device after, after entering the second serum pot by pipeline self, again by the 3rd serum recycle be pumped to the 3rd serosity follow spraying layer ejection, recycle.
Further, the outlet of described first serum pot connects with first order uptake zone also by pipeline.In above-mentioned first serum recycle loop, owing to the high temperature of flue gas can make serosity concentrate, it is easy to bisulfite ammonia, the formation of ammonium sulfite crystal, so the concentration of slurry of first order uptake zone can be increasing, during use, after concentration reaches to a certain degree, need to extract the crystal formed out, simultaneously because the first serum pot also connects with first order uptake zone, the serosity of first order uptake zone just can be supplemented by the serosity in such second serum recycle loop so that the serosity of first order uptake zone maintains balance.
Further, described uptake zone, the second level also includes packing layer, and in this packing layer is laterally distributed in desulfurizing tower and between the second serosity spraying layer and the second airflow uniform distribution device, described packing layer is equipped with packing layer flusher;Described scrubbing section also includes demister, and this demister is laterally distributed in desulfurizing tower and is positioned at the 3rd serosity and follows near smoke outlet above spraying layer, and described demister is equipped with demister flusher;The outlet of described second serum pot connects with described packing layer flusher and demister flusher respectively also by pipeline, can circulate and be rinsed packing layer and demister;Rinse and after the serosity after packing layer can fall into the first airflow uniform distribution device, enter the first serum pot, and then circulation;Rinse and after the serosity after demister can fall into the second airflow uniform distribution device, enter the second serum pot, and then circulation;The effect of described packing layer is, for the air-liquid sufficient contact surface of biphase offer, and creates conditions for improving its less turbulence, is beneficial to mass transfer.
Further, the number of plies of described first serosity spraying layer is 1-3 layer, the atomization solid nozzle that the nozzle of its each layer all uses atomization angle to be 90 °-120 °.
Further, the number of plies of described second serosity spraying layer is 1-3 layer, and the nozzle of its each layer all uses jet nozzle, each jet nozzle the most upwards to spray.The purpose upwards sprayed is so that serosity first moves in the same direction with flue gas, is formed and once contacts, and rear slurry is again because of gravity reversal and flue gas move toward one another, forms secondary contact, and twice contact improves desulfuration efficiency.When arranging, liquid column tower form upwards multi-stage jet can be used.The process of this second serosity spraying layer of process, then coordinate the process of follow-up packing layer, improve gas-liquid mass transfer efficiency, make desulfuration efficiency can reach 97%-99.9%.
Further, the number of plies that described 3rd serosity follows spraying layer is 1-3 layer, the atomization solid nozzle that the nozzle of its each layer all uses atomization angle to be 90 °-120 °.
Further, the number of plies of described packing layer is 1-2 layer.
This utility model additionally provides a kind of three circulating flue gas desulfurization systems for wet ammonia process desulfurizing, this desulphurization system includes prewashing tower and main absorption tower, it is provided with first order uptake zone in described prewashing tower, be disposed with uptake zone, the second level and scrubbing section in described main absorption tower along flow of flue gas direction, described first order uptake zone is connected with uptake zone, the second level by a connection smoke pipe;The gas approach of described desulphurization system is positioned at the bottom of described first order uptake zone, and exhanst gas outlet is positioned at the top of described scrubbing section;
Described first order uptake zone is correspondingly arranged on the first serum recycle loop, and the first serum recycle loop includes the first serosity spraying layer and the first slurry circulating pump;The first described serosity spraying layer is laterally distributed in prewashing tower;The import of described first slurry circulating pump is connected with the bottom of first order uptake zone by pipeline, exports and is connected by pipeline and the first serosity spraying layer;
Described uptake zone, the second level is correspondingly arranged on the second serum recycle loop, and the second serum recycle loop includes the second serosity spraying layer and the second slurry circulating pump;The second described serosity spraying layer is laterally distributed in main absorption tower;The import of described second slurry circulating pump is connected with the bottom of uptake zone, the second level by pipeline, exports and is connected by pipeline and the second serosity spraying layer.
Described scrubbing section is correspondingly arranged on the 3rd serum recycle loop, and the 3rd serum recycle loop includes that the 3rd serosity follows spraying layer, the first airflow uniform distribution device, the first serum pot and the 3rd slurry circulating pump;The 3rd described serosity follows spraying layer and is laterally distributed in main absorption tower;The first described airflow uniform distribution device is laterally distributed in the 3rd serosity and follows the lower section of spraying layer;Described first airflow uniform distribution device passes through pipeline and the inlet communication of the first serum pot, and the outlet of the first serum pot follows spraying layer by pipeline and the 3rd serosity and connects;On the pipeline that the 3rd described slurry circulating pump is arranged at the first serum pot and the 3rd serosity follows between spraying layer.
Further, described first order uptake zone also includes prewashing tower demister, and this prewashing tower demister is laterally distributed in the prewashing tower below described connection smoke pipe entrance, and described prewashing tower demister is equipped with prewashing tower demister flusher;Described uptake zone, the second level also includes packing layer, and in this packing layer is laterally distributed in main absorption tower and between the second serosity spraying layer and the first airflow uniform distribution device, described packing layer is equipped with packing layer flusher;Described scrubbing section also includes main absorption tower demister, and in this main absorption tower demister is laterally distributed in main absorption tower and be positioned at the 3rd serosity and follow above spraying layer near smoke outlet, described main absorption tower demister is equipped with main absorption tower demister flusher;Described second serum recycle delivery side of pump connects with described prewashing tower demister flusher also by pipeline;The outlet of described first serum pot connects with described packing layer flusher and main absorption tower demister flusher respectively also by pipeline.
It should be noted that, the first described airflow uniform distribution device and the second airflow uniform distribution device are existing apparatus, and it can make flue gas pass from the bottom up, can catch again the serosity that falls of top and be conducted into corresponding serum pot.
The first described serum recycle loop: with mass concentration be 15%-20%(i.e. density be 1074.14Kg/m-1102.41Kg/m), pH value be the serosity of 4.0-5.0 flue gas is circulated spray process, through this serosity process after flue-gas temperature be 50 DEG C-60 DEG C;
The second described serum recycle loop: with mass concentration be 10%-15%(i.e. density be 1045.88Kg/m-1074.14Kg/m), pH value be the serosity of 5.0-6.0 flue gas is circulated spray process;After the flue gas of above-mentioned 50 DEG C-60 DEG C enters the second serum recycle loop, for providing suitable temperature in this closed circuit desulfurization;
The 3rd described serum recycle loop: with mass concentration be 3%-10%(i.e. density be 1000Kg/m-1045.88Kg/m) serosity flue gas be circulated spray process;
Liquid-gas ratio in described first serum recycle loop is 2.8-4.5L/Nm, and the liquid-gas ratio in described second serum recycle loop is 8.6-10L/Nm.
The key component of described serosity includes ammonium sulfite, bisulfite ammonia, ammonium sulfate, it should be noted that, serosity also can be mixed into the material in a small amount of dust and flue gas during circulation;Serosity in described 3rd serum recycle loop can be containing very small amount ammonium sulfite, bisulfite ammonia and the fresh water (FW) of ammonium sulfate.
This utility model is divided into three independent closed circuits, i.e. first, second, 3rd serum recycle loop, each closed circuit controls variable concentrations respectively, flue gas is processed by the serosity of pH value, reach following beneficial effect: (1) first serum recycle loop uses pH value to be the serosity of 4.0-5.0, ensure that the oxidation of by-product and the environment of crystallization, improve yield and the quality of by-product ammonium sulfate, second serum recycle loop uses pH value to be the serosity of 5.0-6.0, ensure that the desulfuration efficiency of sulfur dioxide, therefore, by the serosity multidomain treat-ment of two kinds of pH value, both ensure that oxidation and the crystallization of by-product, in turn ensure that high desulfurization efficiency, solve both implacable contradiction;(2) traditional handicraft improves desulfuration efficiency by increase liquid-gas ratio, cause the increase of amount of ammonia slip and produce more aerosol, high desulfurization efficiency of the present utility model can be substantially reduced liquid-gas ratio, thus effectively reduces aerosol and amount of ammonia slip, and reduces energy consumption and operating cost;(3) add airflow uniform distribution device, improve air flow method situation in desulfurizing tower, not only improve the raising of sulfur dioxide removal rate, advantageously reduce again the load of packing layer and demister;(4) flue gas enters back into demister after the washing in scrubbing section the 3rd serum recycle loop, can reduce the workload of demister;(5) flue gas is after desulfurizing tower of the present utility model processes, and can guarantee that desulfurization degree reaches 97%-99.9%, it is achieved the sulfur dioxide minimum discharge of up-to-date environmental requirement.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2;
nullFigure is labeled as: 1-gas approach,2-the first serosity spraying layer,3-the first airflow uniform distribution device,4-the second serosity spraying layer,5-packing layer,6-packing layer flusher,7-the second airflow uniform distribution device,8-the 3rd serosity follows spraying layer,9-demister flusher,10-demister,11-exhanst gas outlet,12-desulfurizing tower,13-the first slurry circulating pump,14-the first serum pot,15-the second slurry circulating pump,16-the second serum pot,17-the 3rd slurry circulating pump,18-connects smoke pipe,19-prewashing tower demister,20-prewashing tower demister flusher,21-main absorption tower demister,22-main absorption tower demister flusher,23-prewashing tower,The main absorption tower of 24-,I-first order uptake zone,Uptake zone, II-second level,III-scrubbing section.
Detailed description of the invention
Below in conjunction with specific embodiment, this utility model is described in further detail, but embodiment of the present utility model is not limited to this.
As a example by certain 90t/h coal-burned industrial boiler, its exhaust gas volumn is SO in flue gas after 116700Nm/h, dedusting2Concentration is 2720mg/Nm, exhaust gas temperature is 160 DEG C.
Embodiment 1
As shown in Figure 1, the three circulating flue gas desulfurization towers for wet ammonia process desulfurizing of the present utility model, this desulfurizing tower is single column, desulfurizing tower ¢ 5000 × H30000, the gas approach 1 of this desulfurizing tower has set up first order uptake zone I, uptake zone, the second level II and scrubbing section III between exhanst gas outlet 11 successively, wherein gas approach 1 is positioned at the middle and lower part of first order uptake zone, and exhanst gas outlet 11 is positioned at the top of scrubbing section.
Described first order uptake zone is correspondingly arranged on the first serum recycle loop, and the first serum recycle loop includes the first serosity spraying layer 2 and the first slurry circulating pump 13;The first described serosity spraying layer 2 is laterally distributed in desulfurizing tower;The import of described first slurry circulating pump 13 is connected with the bottom of desulfurizing tower by pipeline, and outlet is connected by pipeline and the first serosity spraying layer 2.
Described uptake zone, the second level is correspondingly arranged on the second serum recycle loop, and the second serum recycle loop includes the second serosity spraying layer the 4, first airflow uniform distribution device the 3, first serum pot 14 and the second slurry circulating pump 15;The second described serosity spraying layer 4 is laterally distributed in desulfurizing tower;The first described airflow uniform distribution device 3 is laterally distributed in below the second serosity spraying layer 4;nullThe first described airflow uniform distribution device 3 is by pipeline and the inlet communication of the first serum pot 14,After the outlet of the first serum pot 14 first passes through a main pipeline branch after the second slurry circulating pump 15 again,It is connected with the desulfurizing tower inwall below the second serosity spraying layer 4 and the first airflow uniform distribution device 3 respectively,The pipeline being wherein connected with desulfurizing tower inwall is for supplementing the serosity in first order uptake zone,Its magnitude of recruitment is 12m/h,In the first serum recycle loop,Owing to the high temperature of flue gas can make serosity concentrate,It is easy to bisulfite ammonia、The formation of ammonium sulfite crystal,So the concentration of slurry of first order uptake zone can be increasing,After concentration reaches to a certain degree,Need to extract the crystal formed out,And the serosity that above-mentioned supplementary serosity (magnitude of recruitment 12m/h) can make the first order uptake zone after extracting crystal out maintains balance,The second described slurry circulating pump 15 is for providing power for serum recycle.
Described scrubbing section is correspondingly arranged on the 3rd serum recycle loop, and the 3rd serum recycle loop includes that the 3rd serosity follows spraying layer the 8, second airflow uniform distribution device the 7, second serum pot 16 and the 3rd slurry circulating pump 17;The 3rd described serosity follows spraying layer 8 and is laterally distributed in desulfurizing tower;The second described airflow uniform distribution device 7 is laterally distributed in the 3rd serosity and follows below spraying layer 8;Being additionally provided with packing layer 5 in described uptake zone, the second level, packing layer 5 is positioned at the lower section of the second airflow uniform distribution device 7, the top of the second serosity spraying layer 4, is also equipped with packing layer flusher 6 above this packing layer 5;Being additionally provided with demister 10 in described scrubbing section, demister 10 is positioned at the 3rd serosity and follows the top of spraying layer 8 at exhanst gas outlet 11, demister 10 be both above and below equipped with demister flusher 9;Described second airflow uniform distribution device 7 is by pipeline and the inlet communication of the second serum pot 16, after the outlet of the second serum pot 16 first passes through a main pipeline branch after the 3rd slurry circulating pump 17, following spraying layer 8 with packing layer flusher the 6, the 3rd serosity respectively and demister flusher 9 is connected, described 3rd slurry circulating pump 17 is for providing power for serum recycle;The serosity of described packing layer flusher 6 ejection can flow into the first airflow uniform distribution device 3 after first washing packing layer 5 again, enters the first serum pot 14, is circulated;Described 3rd serosity follow the serosity of spraying layer 8 ejection to the second airflow uniform distribution device 7 washing after, flow into the second serum pot 16 through this airflow uniform distribution device, enter circulation;The serosity of described demister flusher 9 ejection can flow into the second serum pot 16 through the second airflow uniform distribution device 7 after first washing demister 10 again, enters circulation.
When this desulfurizing tower is specifically arranged, the first described serosity spraying layer 2 includes 1-3 sub-spraying layer, and the nozzle of each sub-spraying layer all uses atomization solid nozzle, and its atomization angle is 90 °-120 °.The second described serosity spraying layer 4 includes 1-3 sub-spraying layer, and the nozzle of each sub-spraying layer all uses jet nozzle, and jet nozzle the most upwards sprays.The 3rd described serosity follows spraying layer 8 and includes 1-3 sub-spraying layer, and the nozzle of each sub-spraying layer all uses atomization solid nozzle, and its atomization angle is 90 °-120 °.Described packing layer 5 includes 1-2 sub-packing layer.It should be noted that, the purpose that the jet nozzle of the second serosity spraying layer 4 upwards sprays is so that serosity first moves in the same direction with flue gas, formed and once contact, and rear slurry is again because of gravity reversal and flue gas move toward one another, forming secondary contact, twice contact improves desulfuration efficiency.
The first described serosity spraying layer 2 be used for spraying mass concentration be 18%(i.e. density be 1097Kg/m), pH value be the serosity of 4.26, the spray flux of this serosity is 350m/h;The second described serosity spraying layer 4 be used for spraying mass concentration be 12% (i.e. density is 1057Kg/m), pH value be the serosity of 5.84, the spray flux of this serosity is 1050m/h;The 3rd described serosity follows spraying layer 8 for ejection containing very small amount ammonium sulfite, bisulfite ammonia and the fresh water (FW) of ammonium sulfate.
Flue gas is after first order uptake zone processes, temperature when going out first order uptake zone is about 50 DEG C, and desulfuration efficiency is 33%, and flue gas continues after going out first order uptake zone to process through uptake zone, the second level again, desulfuration efficiency after process is 98.9%, discharges behind the most scrubbed district.The smoke desulfurization efficiency of discharge is 98.9%, i.e. content of sulfur dioxide 30mg/Nm in neat stress, droplet content 38mg/Nm, it is achieved that the minimum discharge of coal-burned industrial boiler sulfur dioxide.
Embodiment 2
As shown in Figure 2, the three circulating flue gas desulfurization systems for wet ammonia process desulfurizing of the present utility model, this desulphurization system is double tower, including prewashing tower 23 and main absorption tower 24, it is provided with first order uptake zone I in described prewashing tower 23, the bottom on described main absorption tower 24 is provided with uptake zone, the second level II, and top is provided with scrubbing section III;Described first order uptake zone is connected with uptake zone, the second level by a connection smoke pipe 18;The gas approach 1 of described desulphurization system is positioned at the bottom of described first order uptake zone, and exhanst gas outlet 11 is positioned at the top of described scrubbing section;
Described first order uptake zone is correspondingly arranged on the first serum recycle loop, and the first serum recycle loop includes the first serosity spraying layer 2 and the first slurry circulating pump 13;The first described serosity spraying layer 2 is laterally distributed in prewashing tower 23;The import of described first slurry circulating pump 13 is connected with the bottom of first order uptake zone by pipeline, and outlet is connected by pipeline and the first serosity spraying layer 2;
Described uptake zone, the second level is correspondingly arranged on the second serum recycle loop, and the second serum recycle loop includes the second serosity spraying layer 4 and the second slurry circulating pump 15;The second described serosity spraying layer 4 is laterally distributed in main absorption tower 24;Described first order uptake zone also includes prewashing tower demister 19, and this prewashing tower demister 19 is laterally distributed in the prewashing tower 23 below described connection smoke pipe 18 entrance, and described prewashing tower demister 19 is equipped with prewashing tower demister flusher 20;The import of described second slurry circulating pump 15 is connected with the bottom of uptake zone, the second level by pipeline, after outlet is by a main pipeline branch, is connected with the second serosity spraying layer 4 and prewashing tower demister flusher 20 respectively.
Described scrubbing section is correspondingly arranged on the 3rd serum recycle loop, and the 3rd serum recycle loop includes that the 3rd serosity follows spraying layer the 8, first airflow uniform distribution device the 3, first serum pot 14 and the 3rd slurry circulating pump 17;The 3rd described serosity follows spraying layer 8 and is laterally distributed in main absorption tower 24;The first described airflow uniform distribution device 3 is laterally distributed in the 3rd serosity and follows the lower section of spraying layer 8;Described uptake zone, the second level also includes packing layer 5, and in this packing layer 5 is laterally distributed in main absorption tower 24 and between the second serosity spraying layer 4 and the first airflow uniform distribution device 3, described packing layer 5 is equipped with packing layer flusher 6;Described scrubbing section also includes main absorption tower demister 21, in this main absorption tower demister 21 is laterally distributed in main absorption tower 24 and be positioned at the 3rd serosity and follow above spraying layer 8 at exhanst gas outlet 11, described main absorption tower demister 21 is equipped with main absorption tower demister flusher 22;Described first airflow uniform distribution device 3 is by pipeline and the inlet communication of the first serum pot 14, after the outlet of the first serum pot 14 first passes through a main pipeline branch after the 3rd slurry circulating pump 17, follow spraying layer 8 with packing layer flusher the 6, the 3rd serosity respectively and main absorption tower demister flusher 22 is connected.
The first described serosity spraying layer 2 be used for spraying mass concentration be 18%(i.e. density be 1097Kg/m), pH value be the serosity of 4.26, the spray flux of this serosity is 350m/h;The second described serosity spraying layer 4 be used for spraying mass concentration be 12% (i.e. density is 1057Kg/m), pH value be the serosity of 5.84, the spray flux of this serosity is 1050m/h;The 3rd described serosity follows spraying layer 8 for ejection containing very small amount ammonium sulfite, bisulfite ammonia and the fresh water (FW) of ammonium sulfate.
Flue gas is after the first order uptake zone of prewashing tower processes, temperature when going out prewashing tower is about 50 DEG C, and desulfuration efficiency is 33%, and flue gas continues again through uptake zone, the second level process on main absorption tower after going out prewashing tower, desulfuration efficiency after process is 98.9%, discharges after the scrubbing section on main absorption tower the most again.The smoke desulfurization efficiency of discharge is 98.9%, i.e. content of sulfur dioxide 30mg/Nm in neat stress, droplet content 38mg/Nm, it is achieved that the minimum discharge of coal-burned industrial boiler sulfur dioxide.

Claims (9)

1. for three circulating flue gas desulfurization towers of wet ammonia process desulfurizing, the gas approach (1) of this desulfurizing tower is arranged less than exhanst gas outlet (11), it is characterised in that: it is disposed with first order uptake zone, uptake zone, the second level and scrubbing section between described gas approach (1) to exhanst gas outlet (11);
Described first order uptake zone is correspondingly arranged on the first serum recycle loop, and the first serum recycle loop includes the first serosity spraying layer (2) and the first slurry circulating pump (13);The first described serosity spraying layer (2) is laterally distributed in desulfurizing tower;The import of described first slurry circulating pump (13) is connected with the bottom of first order uptake zone by pipeline, exports and is connected by pipeline and the first serosity spraying layer (2);
Described uptake zone, the second level is correspondingly arranged on the second serum recycle loop, and the second serum recycle loop includes the second serosity spraying layer (4), the first airflow uniform distribution device (3), the first serum pot (14) and the second slurry circulating pump (15);The second described serosity spraying layer (4) is laterally distributed in desulfurizing tower;Described the first airflow uniform distribution device (3) is laterally distributed in the lower section of the second serosity spraying layer (4);Described the first airflow uniform distribution device (3) passes through pipeline and the inlet communication of the first serum pot (14), and the outlet of the first serum pot (14) is connected by pipeline and the second serosity spraying layer (4);Described the second slurry circulating pump (15) is arranged on the pipeline between the first serum pot (14) and the second serosity spraying layer (4);
Described scrubbing section is correspondingly arranged on the 3rd serum recycle loop, and the 3rd serum recycle loop includes that the 3rd serosity follows spraying layer (8), the second airflow uniform distribution device (7), the second serum pot (16) and the 3rd slurry circulating pump (17);The 3rd described serosity follows spraying layer (8) and is laterally distributed in desulfurizing tower;Described the second airflow uniform distribution device (7) is laterally distributed in the 3rd serosity and follows the lower section of spraying layer (8);Described second airflow uniform distribution device (7) passes through pipeline and the inlet communication of the second serum pot (16), and the outlet of the second serum pot (16) follows spraying layer (8) by pipeline and the 3rd serosity and connects;The 3rd described slurry circulating pump (17) is arranged at the second serum pot (16) and the 3rd serosity follows on the pipeline between spraying layer (8).
The three circulating flue gas desulfurization towers for wet ammonia process desulfurizing the most according to claim 1, it is characterised in that: the outlet of described first serum pot (14) connects with first order uptake zone also by pipeline.
The three circulating flue gas desulfurization towers for wet ammonia process desulfurizing the most according to claim 1, it is characterised in that:
Described uptake zone, the second level also includes packing layer (5), this packing layer (5) is laterally distributed in desulfurizing tower and is positioned between the second serosity spraying layer (4) and the second airflow uniform distribution device (7), and described packing layer (5) is equipped with packing layer flusher (6);
Described scrubbing section also includes that demister (10), this demister (10) are laterally distributed in desulfurizing tower and are positioned at the 3rd serosity and follows spraying layer (8) top near exhanst gas outlet (11) place, and described demister (10) is equipped with demister flusher (9);
The outlet of described second serum pot (16) connects with described packing layer flusher (6) and demister flusher (9) respectively also by pipeline.
The three circulating flue gas desulfurization towers for wet ammonia process desulfurizing the most according to claim 1, it is characterised in that: the number of plies of described first serosity spraying layer (2) is 1-3 layer, the atomization solid nozzle that the nozzle of its each layer all uses atomization angle to be 90 °-120 °.
The three circulating flue gas desulfurization towers for wet ammonia process desulfurizing the most according to claim 1, it is characterised in that: the number of plies of described second serosity spraying layer (4) is 1-3 layer, and the nozzle of its each layer all uses jet nozzle, each jet nozzle the most upwards to spray.
The three circulating flue gas desulfurization towers for wet ammonia process desulfurizing the most according to claim 1, it is characterised in that: the number of plies that described 3rd serosity follows spraying layer (8) is 1-3 layer, the atomization solid nozzle that the nozzle of its each layer all uses atomization angle to be 90 °-120 °.
The three circulating flue gas desulfurization towers for wet ammonia process desulfurizing the most according to claim 3, it is characterised in that: the number of plies of described packing layer (5) is 1-2 layer.
8. for three circulating flue gas desulfurization systems of wet ammonia process desulfurizing, it is characterized in that: this desulphurization system includes prewashing tower (23) and main absorption tower (24), it is provided with first order uptake zone in described prewashing tower (23), be disposed with uptake zone, the second level and scrubbing section in described main absorption tower (24) along flow of flue gas direction, described first order uptake zone is connected with uptake zone, the second level by connection smoke pipe (18);The gas approach (1) of described desulphurization system is positioned at the bottom of described first order uptake zone, and exhanst gas outlet (11) is positioned at the top of described scrubbing section;
Described first order uptake zone is correspondingly arranged on the first serum recycle loop, and the first serum recycle loop includes the first serosity spraying layer (2) and the first slurry circulating pump (13);The first described serosity spraying layer (2) is laterally distributed in prewashing tower (23);The import of described first slurry circulating pump (13) is connected with the bottom of first order uptake zone by pipeline, exports and is connected by pipeline and the first serosity spraying layer (2);
Described uptake zone, the second level is correspondingly arranged on the second serum recycle loop, and the second serum recycle loop includes the second serosity spraying layer (4) and the second slurry circulating pump (15);The second described serosity spraying layer (4) is laterally distributed in main absorption tower (24);The import of described second slurry circulating pump (15) is connected with the bottom of uptake zone, the second level by pipeline, exports and is connected by pipeline and the second serosity spraying layer (4);
Described scrubbing section is correspondingly arranged on the 3rd serum recycle loop, and the 3rd serum recycle loop includes that the 3rd serosity follows spraying layer (8), the first airflow uniform distribution device (3), the first serum pot (14) and the 3rd slurry circulating pump (17);The 3rd described serosity follows spraying layer (8) and is laterally distributed in main absorption tower (24);Described the first airflow uniform distribution device (3) is laterally distributed in the 3rd serosity and follows the lower section of spraying layer (8);Described first airflow uniform distribution device (3) passes through pipeline and the inlet communication of the first serum pot (14), and the outlet of the first serum pot (14) follows spraying layer (8) by pipeline and the 3rd serosity and connects;The 3rd described slurry circulating pump (17) is arranged at the first serum pot (14) and the 3rd serosity follows on the pipeline between spraying layer (8).
The three circulating flue gas desulfurization systems for wet ammonia process desulfurizing the most according to claim 8, it is characterized in that: described first order uptake zone also includes prewashing tower demister (19), this prewashing tower demister (19) is laterally distributed in the prewashing tower (23) below described connection smoke pipe (18) entrance Nei, and described prewashing tower demister (19) is equipped with prewashing tower demister flusher (20);Described uptake zone, the second level also includes packing layer (5), this packing layer (5) is laterally distributed in main absorption tower (24) and is positioned between the second serosity spraying layer (4) and the first airflow uniform distribution device (3), and described packing layer (5) is equipped with packing layer flusher (6);Described scrubbing section also includes main absorption tower demister (21), this main absorption tower demister (21) is laterally distributed in main absorption tower (24) and is positioned at the 3rd serosity follows spraying layer (8) top near exhanst gas outlet (11) place, and described main absorption tower demister (21) is equipped with main absorption tower demister flusher (22);The outlet of described second slurry circulating pump (15) connects with described prewashing tower demister flusher (20) also by pipeline;The outlet of described first serum pot (14) connects with described packing layer flusher (6) and main absorption tower demister flusher (22) respectively also by pipeline.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105727723A (en) * 2016-05-09 2016-07-06 四川君和环保股份有限公司 Three-cycle desulphurization method for wet type ammonia-process desulphurization and flue gas desulfurization tower or system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105727723A (en) * 2016-05-09 2016-07-06 四川君和环保股份有限公司 Three-cycle desulphurization method for wet type ammonia-process desulphurization and flue gas desulfurization tower or system

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