CN104826476A - Industrial flue gas desulfurization/denitrification/dedusting integrated technique and device - Google Patents
Industrial flue gas desulfurization/denitrification/dedusting integrated technique and device Download PDFInfo
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Abstract
The invention relates to air pollution control, and provides an industrial flue gas desulfurization/denitrification/dedusting integrated technique. Ozone and ammonia water are adopted to form the technique composed of at least three circulating spray stages in the spray tower, thereby synchronously removing nitrogen and sulfur compounds in the flue gas. The invention also provides an industrial flue gas desulfurization/denitrification/dedusting integrated device which is applied to the technique. In the technique, the ozone with strong oxidizing property is utilized to convert nitrogen monoxide in the flue gas into nitrogen dioxide, and the spray tower is divided into at least three stages to perform the circulating spray by using the ammonia water. The whole technical process has very high utilization ratio for ammonia water, and can synchronously implement desulfurization and denitrification at higher efficiency. The flue gas carries the solution with very low concentration, can not generate the phenomenon of white smoke, and can completely satisfy the national discharge standard. The device applied to the technique has the advantages of simpler structure, smaller occupied area and lower investment cost.
Description
Technical field
The present invention relates to Air Pollution Control field, particularly relate to a kind of process and device of desulfurizing industrial fume denitration dust collecting integral.
Background technology
Usually containing multiple pollutant component in industrial smoke, as sulfur dioxide, nitrogen oxide, dust and be attached on the materials such as heavy metal, bioxin on dust, in flue gas, moisture also can carry part soluble inorganic salt.Existing smoke processing system mainly processes for Single Pollution thing, and for so complicated flue gas characteristic, smoke processing system is also very complicated, is difficult to the shortcoming of timely load-responsive change.
Removing for sulfur dioxide, conventional limestone-gypsum method or ammonia-ammonium sulfate method in engineering, but these two kinds of systems are all difficult to process nitrogen oxide, and there is the phenomenon of serious exiting flue gas containing alkali droplet, secondary pollution is caused to environment.Removing for nitrogen oxide, traditional method mainly contains selective catalytic reduction and SNCR method, although the former efficiency is higher, there is the catalyst easily problem such as poisoning, NH_3 leakage, it is not high to there is again efficiency in the latter, the problem of the higher and temperature window narrow range of Applicable temperature.
When there is sulfur dioxide and nitrogen oxide in flue gas, process respectively for sulfur dioxide and nitrogen oxide simultaneously, have that two kinds of techniques influence each other, energy consumption and the series of problems such as operating cost is high, floor space is large, equipment investment is high.
In order to solve the problem, notification number is that the Chinese invention patent description of CN101934191 proposes one " method of ammonia flue gas simultaneous SO_2 and NO removal ", adopt ammonium sulfite and ammonium bisulfite as reducing agent, be nitrogen by reduction of nitrogen oxide, but the method reducing power is limited, and reaction speed is slow, removal efficiency is low, and can not solve the drop that wet method removes system and carry problem.
Summary of the invention
The object of the present invention is to provide a kind of process of desulfurizing industrial fume denitration dust collecting integral, being intended to for solving the lower problem of existing flue gas desulfurization and denitration technique efficiency.
The present invention is achieved in that
The invention provides a kind of process of desulfurizing industrial fume denitration dust collecting integral, spray column is adopted to spray nitrogenous sulphur flue gas, at least three layers of spray space are vertically divided into successively in described spray column, comprise the described spray space of below, each described spray space of centre and the described spray space of top, and spray described in adjacent two layers between space and separated by the demister that can carry out gas-liquid separation, comprise following processing step:
Collect flue gas, injection technology water and ozone in flue gas, add wet flue gas is nitrogen dioxide by the oxidation of nitric oxide in flue gas simultaneously;
Flue gas after oxidation is imported in the described spray space below described spray column, and adopt ammoniacal liquor vertically to spray flue gas in it to carry out desulphurization denitration process to flue gas, and the mixed solution after bottom collection spray in this spray space extracts this mixed solution to the spray place in this spray space simultaneously carries out circulated sprinkling;
Flue gas enters through the demister between the described spray space and the described spray space of last layer of below and is positioned at middle described spray space, middle each described spray space also adopts ammonia spray to remove remaining nitrogen dioxide and sulfur dioxide in flue gas successively, respectively spray space also collect spray after mixed solution and the ammonia spray place being directed at this spray space carries out circulated sprinkling;
Flue gas continues to rise and passes through middle each described spray space successively, and the demister between middle described spray space and the described spray space of top enters in the described spray space of top, again adopt ammonia spray to remove remaining nitrogen dioxide and sulfur dioxide in flue gas, the mixed solution after spray is also collected in this spray space the ammonia spray place being directed at this spray space carries out circulated sprinkling;
Flue gas employing dehydrater successively after the ammonia spray at least three layers of described spray space is removed the particulate contained in flue gas and discharges the external world.
Present invention also offers a kind of desulfurizing industrial fume denitrating and integrating apparatus, in process for above-mentioned desulfurizing industrial fume denitration dust collecting integral, comprise the spray column for importing non-desulphurization denitration flue gas and the dehydrater for carrying out processed to the flue gas after the described spray column of discharge, described spray column comprises at least three layers of spray space vertically set gradually, comprise described spray space, top successively, middle each described spray space and described spray space, top, and spray described in adjacent two layers between space and adopt described demister to separate, described spray space, below, the first spout for spraying ammoniacal liquor is respectively arranged with in middle each described spray space and described spray space, top, second spout and the 3rd spout, the bottom in described spray space, below is provided with the first reception room for collecting reacted mixed solution, be provided with for mixed solution in described first reception room is directed at the first conduit of described first nozzle between described first reception room and described first spout, middle each described spray space is provided with for generating mixed solution after collecting spray and can along the first air distribution plate of direction one-way conduction from the bottom to top in the below of described second spout, the first air distribution plate described in each with and its corresponding described second spout between be provided with the second conduit for the mixed solution on described first air distribution plate being directed at described second nozzle, described spray space, top is provided with in the below of described 3rd spout for generating mixed solution after collecting spray and along the second air distribution plate of direction one-way conduction from the bottom to top, can being provided with the 3rd conduit for the mixed solution on described second air distribution plate being directed at described 3rd nozzle between described second air distribution plate and described 3rd spout.
The present invention has following beneficial effect:
The strong oxidizing property of ozone is first adopted to be nitrogen dioxide by the conversion of nitric oxide gas in flue gas in technique of the present invention, then in spray column, adopt ammoniacal liquor to carry out circulated sprinkling to flue gas, can synchronously realize desulphurization denitration action, spray column is divided at least three grades of sprays simultaneously, progressively remove the nitrogen sulphur in flue gas, each layer spray space is independent loops spray model, make the solution concentration of carrying in flue gas very low, not only alleviate the white cigarette phenomenon of wet desulfurization system, also reduce equipment corrosion, desulfuration efficiency and denitration efficiency can reach more than 95%, drop clearance reaches more than 70%, flue gas after this PROCESS FOR TREATMENT meets discharging standards completely, and the device be applied in above-mentioned technique, not only floor space is few, overall structure is also fairly simple, the corrosion of the solution produced in technical process to device is lower, be conducive to controlled investment cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the desulfurizing industrial fume denitrating and integrating apparatus that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, embodiments provide a kind of process of desulfurizing industrial fume denitration dust collecting integral, spray column 1 is mainly adopted to remove nitrogen in flue gas and sulphur by the mode sprayed, it vertically can be divided into successively at least three spray spaces 11 for spray column 1, comprise spray space 11, below, middle each spray space 11 and spray space, top 11 successively, demister 3 is then adopted to separate between adjacent two spray spaces 11, and demister 3 can realize gas-liquid separating function, concrete processing step is as follows:
Collect flue gas, here flue gas mainly refers to industrial smoke, containing sulfur dioxide harmful in a large number and oxynitrides (especially nitric oxide) etc., injection technology water and ozone in this flue gas, the effect adding wet flue gas can be played by fresh water (FW), ozone then has stronger oxidisability, the nitric oxide that can be oxidized in flue gas generates nitrogen dioxide, be between 0.8-1.5 for the molar ratio range between nitric oxide and ozone, specifically can be 1.1, thus higher oxidation efficiency can be formed, usually, ozone adopts ozone generator 154 to produce, the temperature of the flue gas collected is between 100-250 DEG C, and when ozone mixes with flue gas, the temperature of flue gas is also between 110-240 DEG C,
Flue gas after oxidation is continued import the spray space 11 that spray column 1 is positioned at below, and adopt ammoniacal liquor to spray flue gas at vertical direction, because flue gas has higher temperature, it moves from the bottom to top, the below of ammonia spray position should be positioned to the gas approach of this spray column 1, make to have between flue gas with ammoniacal liquor to contact more fully, and in the process of whole contact scour, not only effectively can to remove in flue gas other dust etc., simultaneously ammoniacal liquor also with the sulfur dioxide in flue gas and nitrogen dioxide generation chemical reaction, and then generate ammonium nitrate solution and ammonium sulfate, and the mixed solution of two kinds of solution and partial ammonia water is all collected into the bottom in this spray space 11 under gravity, water pump 4 grade now can be adopted to extract this mixed solution to the spray place in this spray space 11 again spray, so in the spray space 11 of below, form circulated sprinkling, greatly can improve the utilization rate of ammoniacal liquor in spray process and the denitrification efficiency to flue gas,
Due to the motion from the bottom to top of flue gas, in above-mentioned desulphurization denitration process, flue gas is gradually through the demister 3 sprayed in the middle of spray space, below 11 and last layer space 11, certainly in this flue gas, part nitrogen dioxide is also had and sulfur dioxide chemical reaction does not occur, namely flue gas also needs to carry out desulphurization denitration, and in the process of flue gas through demister 3, centrifugation due to demister 3 makes the steam in spray space 11, below be difficult to enter in middle each spray space 11, and each in the middle of also adopt ammonia spray to enter flue gas in this spray space 11 in spray space 11, and the mixed solution collecting the rear generation of spray is respectively sprayed in space 11 in centre, adopt water pump 4 etc. to extract the easy spray place to corresponding spray space 11 of the mixing of collecting again to spray simultaneously, so circulate successively, also all circulated sprinkling is formed in each spray space 11 of centre, greatly can improve the utilization rate of ammoniacal liquor in spray process and the denitrification efficiency to flue gas,
Flue gas continues to rise, entering top through the demister 3 middle spray space 11 and spray space, top 11 sprays in space 11, through spray space, below 11 and the middle multi-stage spray effect spraying space 11, in flue gas, the content of nitrogen dioxide and sulfur dioxide reduces further, but the flue gas sprayed above entering in space 11 still contains nitrogen dioxide and the sulfur dioxide of minute quantity, also ammoniacal liquor is adopted to spray flue gas this in spray space 11 up, and the mixed solution produced after spray is collected, the ammonia spray place simultaneously adopting water pump etc. to extract to this spray space 11 carries out circulated sprinkling, the denitrification efficiency of further raising spray column 1 pair of flue gas,
When flue gas is successively after the ammonia spray at least three layers of spray space 11, it continues rise and derived by spray column 1, the external world is drained into again through dehydrater 2 effect, certainly when flue gas is directed at dehydrater 2 by spray column 1, another demister 3 can be provided with between, namely be positioned at top spray space 11 flue gas waft from time, this demister 3 also can play the effect of isolation steam, and owing to adopting spray wet desulphurization denitration to have certain particulate in flue gas, adopt dehydrater 2 can remove the particulate etc. contained in flue gas further to this.
In above-mentioned technical process, the effect of synchronized desulfuring and denitrifying can be played, simultaneously can remove the dust that contains in flue gas with bioxin etc. by spray action, and whole process substantially all completes in spray column 1, simplification of flowsheet, reduce floor space, reduce operating cost and equipment investment, and the project implementation is simple, can be used for grassroot project and off-the-shelf item transformation, respectively spray between space 11 separate in addition, thus at least three grades of desulphurization denitrations formed flue gas, remove the sulfur dioxide in flue gas successively step by step, improve the removal efficiency of sulfur dioxide, reduce by demister 3 concentration of liquid drops that flue gas carries simultaneously, make the flue gas after discharging substantially can not contain nitrogen sulphur, and in above-mentioned technique, adopt ozone to be nitrogen dioxide by the oxidation of nitric oxide in flue gas, then adopt ammoniacal liquor to be absorbed by nitrogen dioxide, significantly improve the removal efficiency of former wet desulfurization system to nitrogen oxide, further, owing to all adopting the mode of independent loops to spray in each layer spray space 11, make the concentration of liquid drops that carries in flue gas very low to this, particulate is less, not only alleviate the white cigarette phenomenon of wet desulfurization system, also reduce equipment corrosion, reduce equipment investment, under normal circumstances, the ammoniacal liquor that the spray spraying space 11 by each layer sprays is all normal temperature solution, and the flue gas entered in spray column 1 all has certain temperature, up to more than 100 degree, the effect of cooling can also be formed to flue gas to this this circulated sprinkling mode by Multi-layer sprinkling space 11, namely ensure that the flue-gas temperature of being discharged by spray column 1 is unlikely to very high.
For the mode of collecting mixed solution in each spray space 11 of centre, respectively can spray in space 11 in centre and all be horizontally disposed with the first air distribution plate 111, first air distribution plate 111 is a check valve, and flue gas can pass this first air distribution plate 111 along direction from the bottom to top, and when mixing easy falling within gravity on the first air distribution plate 111, mixed solution cannot permeate the first air distribution plate 111, thus form the one-way conduction function of the first air distribution plate 111, certainly when mixed solution is piled up on the first air distribution plate 111, then adopt water pump 4 grade to be extracted and carry out circulated sprinkling to the middle ammonia spray place spraying space 11 corresponding with it, particularly can at the arranged outside spatial accommodation in each spray space 11 of centre, mixed solution on first air distribution plate 111 is all extracted deposit to spatial accommodation corresponding to it, avoiding the first air distribution plate 111 is piled up has too much mixed solution to hinder flue gas through the first air distribution plate 111.The mixed solution produced after in like manner adopting one second air distribution plate 112 to collect spray in spray space up 11, second air distribution plate 112 is also direction one-way conduction from the bottom to top, there is the function of check valve, namely the flue gas entered in spray space 11, top by spray space, centre 11 can pass through the ammonia spray of this second air distribution plate 112 for spray, and when after spray, the mixed solution of generation drops down onto on the second air distribution plate 112 under gravity, it can not permeate this second air distribution plate 112, adopt water pump 4 grade to be extracted by the mixed solution that the second air distribution plate 112 is collected again and carry out circulated sprinkling to the spray place in spray space, top 11, another chamber also can be set certainly for depositing the mixed solution that the second air distribution plate 112 is collected, when mixed solution drops down onto after on the second air distribution plate 112, mixed solution can flow in this chamber voluntarily, then the mixed solution deposited in this chamber extracts and carries out circulated sprinkling to the spray place in spray space, top 11 by water pump 4, thus can ensure in working order, the upper surface of the second air distribution plate 112 can not have too much mixed solution, the second air distribution plate 112 cannot be passed through to cause flue gas.
Further, in the process of spray, the density of the interior mixed solution collected of density and spray space, top 11 to the mixed solution collected in spray space, centre 11 is needed to detect, and when middle each density spraying the mixed solution collected in space 11 is not less than 1.20 × 10
3kg/m
3in time, then needs to be extracted the bottom to spray space, below 11, and the density with the mixed solution should collected in spray space 11, top is not less than 1.10 × 10
3kg/m
3time, also the bottom to spray space, below 11 is extracted, the mixed solution being about to reach above-mentioned requirements is collected, and still detects the density of the mixed solution collected in spray space, below 11 simultaneously, and when the density of the mixed solution of its bottom collection is not less than 1.35 × 10
3kg/m
3time, can this mixed solution be derived in spray column 1, because of in mixed solution all containing certain ammonium nitrate and ammonium sulfate, crystallization treatment can be carried out by by collecting in spray space, below 11 and detecting the mixed solution reaching required density to this, and then ammonium nitrate in acquisition mixed solution and ammonia sulfate crystal, it all can be used for producing agriculture chemical, realizes the recycling of byproduct.
The embodiment of the present invention additionally provides a kind of desulfurizing industrial fume denitrating and integrating apparatus, it is mainly applied in above-mentioned desulfurizing and denitrifying process, comprise spray column 1 and cooling tower 2, the flue gas not carrying out desulphurization denitration is imported in spray column 1 and carries out desulfurizing and denitrifying process, then after dehydrater 2 carries out processed, drain into the external world.Refinement spray column 1 particularly, spray column 1 comprises at least three layers of spray space 11, these three layers spray space 11 are vertically arranged in order, be respectively spray space 11, below, middle each spray space 11 and spray space, top 11, adjacent two layers spray all adopts a demister 3 to separate between space 11, middle spray space 11 at least comprises one deck spray space 11, below spray space 11 in the middle of spray space 11 and above spray space 11 in be respectively arranged with the first spout 113, second spout 114 and the 3rd spout 115, three nozzles all can spray ammoniacal liquor downwards, further the bottom position in spray space, below 11 is provided with the first reception room 12, this first reception room 12 can collect the mixed solution generated after flue gas sprinkling ammoniacal liquor in this spray space 11 voluntarily, by one first conduit 121, first reception room 12 is communicated with the first spout 113, the mixed solution collected in first reception room 12 can be directed at the first spout 113 place by the first conduit 121, then circulated sprinkling is formed at the first spout 113 place, in each spray space 11 of centre, be in like manner provided with the first air distribution plate 111 for collecting the mixed solution generated after the second spout 114 corresponding with it sprays flue gas, first air distribution plate 111 is positioned at the below of second spout 114 corresponding with it, and edge direction one-way conduction from the bottom to top, be specially one-way conduction flue gas, be similar to one-way valve structures, respectively spraying in centre the mixed solution collected in space 11 to this all drops down onto on the first air distribution plate 111 corresponding with it, this the first air distribution plate 111 can not be permeated, flue gas then can penetrate the top of the first air distribution plate 111 to the first air distribution plate 111, also the second conduit 131 being communicated with second spout 114 corresponding to it is provided with at each first air distribution plate 111 place, the mixed solution at first air distribution plate 111 place corresponding with it can be directed at the second spout 114 place by the second conduit 131 and carry out circulated sprinkling, the second air distribution plate 112 for collecting the mixed solution generated after the 3rd spout 115 sprays flue gas is provided with further in spray space 11 up, second air distribution plate 112 is positioned at the below of the 3rd spout 115, and edge direction one-way conduction from the bottom to top, be specially one-way conduction flue gas, be similar to one-way valve structures, this being sprayed up to the mixed solution collected in space 11 all drops down onto on the second air distribution plate 112, and this second air distribution plate 112 can not be permeated, flue gas then can penetrate the top of the second air distribution plate 112 to the second air distribution plate 112, also the 3rd conduit 141 of connection the 3rd spout 115 is provided with at the second air distribution plate 112 place, the mixed solution at the second air distribution plate 112 place can be directed at the 3rd spout 115 place by the 3rd conduit 141 and carry out circulated sprinkling.Usually, spray column 1 offers air inlet in spray space 11, below place, flue gas after ozone oxidation can in the spray space 11 that this air inlet enters below, certainly this air inlet should be positioned at the below of the first spout 113, fully can contact to make the ammoniacal liquor of the first spout 113 place spray to the nitrogen dioxide in flue gas with sulfur dioxide.
In the present embodiment, flue-gas temperature after ozone oxidation is between 110-240 DEG C, belong to hot-air, this flue gas is moved under normal circumstances straight up, generate after by Strong oxdiative have the flue gas of nitrogen dioxide to be directed at below along air inlet spray space 11 in after, first spout 113 place spray ammoniacal liquor, ammoniacal liquor not only can play the effect of the dust and bioxin etc. washing away and contain in flue gas, can also produce chemical reaction with the nitrogen dioxide in flue gas and sulfur dioxide generates ammonium nitrate and ammonium sulfate simultaneously, thus the desulfurization off sulfide effect realized flue gas, the mixed solution generated after spray extracts and carries out circulated sprinkling to the first spout 113 place by the first conduit 121 simultaneously, the solution of the first spout 113 place ejection can be had with the flue gas in this spray space 11 and contact the utilization rate being not only conducive to improving ammoniacal liquor more fully, also substantially increase the denitrification efficiency to flue gas, certainly moving upward due to flue gas, in the process that the first spout 113 sprays, flue gas continuously passes through spray space 11, below gradually and the middle demister 3 sprayed between space 11 rises in middle spray space 11, now below then can completely cut off by the steam sprayed in space 11 by demister 3, solution fog in spray space 11, below is made to be difficult to enter in middle spray space 11, when flue gas enters after in middle spray space 11, because spray space, below 11 can not realize the complete desulphurization denitration effect to flue gas, namely after flue gas enters middle each spray space 11, also mix in it and have a small amount of nitrogen dioxide and sulfur dioxide, the second spout 114 being positioned at middle each spray space 11 in the present embodiment then can form circulated sprinkling to flue gas successively, thus the desulphurization denitration effect strengthened gradually flue gas, and when flue gas enter top spray space 11 in after, also circulated sprinkling is carried out to flue gas in it, the nitrogen dioxide of the minute quantity contained in further removing flue gas and sulfur dioxide.Independently circulated sprinkling is carried out by layer spray space 11 of at least three in the present embodiment, form three grades of desulfurizing and denitrifying process, not only increase work efficiency, what also reduce solution in flue gas carries concentration, namely the flue gas nitrogen sulphur amount after integrated apparatus process is very low, meets emission request.For generally, device relatively simple for structure, floor space is less, thus greatly can reduce the cost of investment to it.
Further, one section of wireway 15 is outward extended with by the air inlet of spray column 1, and be arranged at intervals with the first inlet pipe 151 at wireway 15 successively along the direction near spray column 1, second inlet pipe 152 and the 3rd inlet pipe 153, first inlet pipe 151 be may be used for importing flue gas in wireway 15, second inlet pipe 152 then can be used for injection technology water, 3rd inlet pipe 153 for importing ozone in wireway 15, and the opening of the first inlet pipe 151 towards with the opening of the 3rd inlet pipe 153 towards, simultaneously all towards the opposite with the opening of the second inlet pipe 152, the opening of certain first inlet pipe 151, the opening of the second inlet pipe 152 and the opening of the 3rd inlet pipe 153 are all positioned at wireway 15.In the present embodiment, flue gas is filled with in wireway 15 by the opening of the first inlet pipe 151, fresh water (FW) then injects in wireway 15 by the opening of the second inlet pipe 152, then can the ozone that ozone generator 154 be adopted to produce be imported in wireway 15 by the opening of the 3rd inlet pipe 153, to this in wireway 15, fresh water (FW) can play the effect adding wet flue gas, the nitric oxide generation oxidation reaction of ozone also in wireway 15 and in flue gas simultaneously, in wireway 15, nitrogen dioxide is generated to make the nitric oxide in flue gas, and enter in the spray space 11 of below via the air inlet of spray column 1 upon reaction completion.General flue gas is dry gas when importing in wireway 15, its movement velocity is than very fast, to this, opening of the first inlet pipe 151 is contrary with the opening of the second inlet pipe 152, the direction that flue gas and fresh water (FW) are entered in wireway 15 is just contrary, flue gas has with fresh water (FW) and contacts more fully, and then the nitric oxide in flue gas and ozone can fully be reacted.
The collection structure in each spray space 11 and spray space, top 11 in the middle of in optimization spray column 1, spray column 1 also has the second reception room 13 and the 3rd reception room 14, when centre respectively spray space 11 spray after the mixed solution of generation drop down onto after on the first air distribution plate 111 corresponding with it, mixed solution can flow in the second reception room 13 corresponding with it automatically, each second reception room 13 is serially connected with on the second conduit 131 corresponding with it, by this second conduit 131, the mixed solution be collected in the second reception room 13 can be extracted the second extremely corresponding spout 114 place to this and carry out circulated sprinkling, the mixed solution that in like manner spray space 11 in top sprays rear generation drops down onto on the second air distribution plate 112, mixed solution flow in the 3rd reception room 14 along the second air distribution plate 112 simultaneously, 3rd reception room 14 is serially connected with on the 3rd conduit 141, by the 3rd conduit 141, the mixed solution be collected in the 3rd reception room 14 extraction can be carried out circulated sprinkling to the 3rd spout 115 place to this.In the present embodiment, set up the second reception room 13 and the mixed solution of the 3rd reception room 14 for prestore respectively the first air distribution plate 111 and the second air distribution plate 112 are collected, make the first air distribution plate 111 and the second air distribution plate 112 can not be piled up have too much mixed solution, and then avoid mixed solution stop to enter the flue gas in middle spray space 11 or spray space, top 11 by spray space, below 11, namely ensure that flue gas can pass through each first air distribution plate 111 and the second air distribution plate 112 along direction from the bottom to top.
Optimize the structure in spray column 1 further, each second reception room 13 and the 3rd reception room 14 are provided with the 4th conduit 16 for being directed at by mixed solution interior separately in the first reception room 12, and in the first reception room 12, each second reception room 13 and the 3rd reception room 14, be provided with the detection part (not shown) for monitoring mixed solution density.When in spray column 1, each layer spray 11 pairs, space flue gas carries out continuing spray, first reception room 12, second reception room 13 and the 3rd reception room 14 internal cause spray increasing of flue gas, its solution concentration of collecting all continues to increase, the density of mixed solution increases gradually, and when the density of mixed solution is excessive then its circulated sprinkling can affect the desulfurization off sulfide effect to flue gas, then now need this mixed solution to derive to avoid it to be recycled, and easily know that flue gas is in the process risen, in it, the content of nitrogen dioxide and sulfur dioxide declines gradually, first reception room 12 accordingly, density warning value in second reception room 13 and the 3rd reception room 14 should reduce successively, the warning value of the first reception room 12 such as can be set as 1.35 × 10
3kg/m
3, the warning value of the second reception room 13 is 1.20 × 10
3kg/m
3, the warning value of the 3rd reception room 14 is 1.10 × 10
3kg/m
3and when the detection density of the second reception room 12 and the 3rd reception room 13 reaches above-mentioned warning value, then adopt the 4th conduit 16 to extract in the first reception room 12, then derive spray column when the detection density of the first reception room 12 reaches warning value and carry out crystallization treatment to obtain ammonium nitrate and ammonia sulfate crystal.
Further, electrostatic precipitator 21 can be adopted for dehydrater 2, the top in spray space, top 11 of spray column 1 and the bottom conducting of electrostatic precipitator 21, and the exhanst gas outlet of electrostatic precipitator 21 can be designed to chimney structure 211, and be positioned at the tip position of electrostatic precipitator 21, when flue gas is discharged, there is good guide effect.In the present embodiment, after the space 11 spray effect of three layers of spray, it is directed at the bottom of electrostatic precipitator 21 to flue gas by spray column 1 successively, the top of electrostatic precipitator 21 is risen to again by the bottom of electrostatic precipitator 21, and in the uphill process of electrostatic precipitator 21, realize the process of particulate in flue gas, elimination efficiency is very high, thus can ensure that it can not carry drop and enters in air and pollute flue gas when draining into the external world, reaches the discharge index of national requirements.Usually when flue gas is directed at electrostatic precipitator 21 by spray column 1, a demister 3 is also adopted to carry out preliminary gas-liquid separation, the solution in spray space 11, top is avoided to be that gaseous state enters in electrostatic precipitator 21, increase the load of electrostatic precipitator 21, the top that can spray space 11 to this is up provided with this demister 3, and flue gas just can need enter in electrostatic precipitator 21 through demister 3.
In said structure, the power part extracted by mixed solution in first reception room 12 to the mixed solution extraction in the second extremely corresponding spout 114 of the mixed solution extraction in the first spout 113, each second reception room 13 and the 3rd reception room 14 to the 3rd spout 115 all can adopt water pump 4 etc., set-up mode for water pump 4 can take independent mode, namely each extraction action all adopts a water pump 4 to form version in parallel, convenient control, also can adopt a water pump 4 to extract certainly.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the process of a desulfurizing industrial fume denitration dust collecting integral, spray column is adopted to spray nitrogenous sulphur flue gas, it is characterized in that: in described spray column, be vertically divided at least three layers of spray space successively, comprise the described spray space of below, each described spray space of centre and the described spray space of top, and spray described in adjacent two layers between space and separated by the demister that can carry out gas-liquid separation, comprise following processing step:
Collect flue gas, injection technology water and ozone in flue gas, add wet flue gas is nitrogen dioxide by the oxidation of nitric oxide in flue gas simultaneously;
Flue gas after oxidation is imported in the described spray space below described spray column, and adopt ammoniacal liquor vertically to spray flue gas in it to carry out desulphurization denitration process to flue gas, and the mixed solution after bottom collection spray in this spray space extracts this mixed solution to the spray place in this spray space simultaneously carries out circulated sprinkling;
Flue gas enters through the demister between the described spray space and the described spray space of last layer of below and is positioned at middle described spray space, middle each described spray space also adopts ammonia spray to remove remaining nitrogen dioxide and sulfur dioxide in flue gas successively, respectively spray space also collect spray after mixed solution and the ammonia spray place being directed at this spray space carries out circulated sprinkling;
Flue gas continues to rise and passes through middle each described spray space successively, and the demister between middle described spray space and the described spray space of top enters in the described spray space of top, again adopt ammonia spray to remove remaining nitrogen dioxide and sulfur dioxide in flue gas, the mixed solution after spray is also collected in this spray space the ammonia spray place being directed at this spray space carries out circulated sprinkling;
Flue gas employing dehydrater successively after the ammonia spray at least three layers of described spray space is removed the particulate contained in flue gas and discharges the external world.
2. the process of desulfurizing industrial fume denitration dust collecting integral as claimed in claim 1, it is characterized in that: the mixed solution that middle each described spray space produces after all adopting the first air distribution plate of direction one-way conduction from the bottom to top to collect spray, the mixed solution that the described spray space of top produces after adopting the second air distribution plate of direction one-way conduction from the bottom to top to collect spray, and the mixed solution of collection is extracted extremely corresponding ammonia spray place by described first air distribution plate and described second air distribution plate respectively carries out circulated sprinkling.
3. the process of desulfurizing industrial fume denitration dust collecting integral as claimed in claim 1, it is characterized in that: the mixed solution that each first air distribution plate is collected first directly is directed at the chamber indoor storage corresponding with it, then by this chamber, the ammonia spray that mixed solution extracts in extremely corresponding with it described spray space, centre is carried out circulated sprinkling; The mixed solution that second air distribution plate is collected first directly is directed at another chamber indoor storage, then by this chamber, mixed solution extraction is carried out circulated sprinkling to the ammonia spray in the described spray space of top.
4. the process of desulfurizing industrial fume denitration dust collecting integral as claimed in claim 3, is characterized in that: the density of the mixed solution collected in each described spray space is in the detection not less than 1.20 × 10
3kg/m
3and the density of the mixed solution collected in described spray space, top is not less than 1.10 × 10
3kg/m
3time, each mixed solution is extracted respectively the bottom in the described spray space to below.
5. the process of desulfurizing industrial fume denitration dust collecting integral as claimed in claim 4, is characterized in that: the density detecting the mixed solution collected in described spray space, below is not less than 1.35 × 10
3kg/m
3this mixed solution is derived crystallization and is obtained ammonium nitrate crystals and ammonia sulfate crystal by time.
6. the process of desulfurizing industrial fume denitration dust collecting integral as claimed in claim 1, is characterized in that: when adopting the nitric oxide in ozone oxidation flue gas, the molar ratio range between ozone and nitric oxide is 0.8-1.5.
7. a desulfurizing industrial fume denitrating and integrating apparatus, in process for desulfurizing industrial fume denitration dust collecting integral according to claim 1, comprise the spray column for importing non-desulphurization denitration flue gas and the dehydrater for carrying out processed to the flue gas after the described spray column of discharge, it is characterized in that: described spray column comprises at least three layers of spray space vertically set gradually, comprise described spray space, top successively, middle each described spray space and described spray space, top, and spray described in adjacent two layers between space and adopt described demister to separate, described spray space, below, the first spout for spraying ammoniacal liquor is respectively arranged with in middle each described spray space and described spray space, top, second spout and the 3rd spout, the bottom in described spray space, below is provided with the first reception room for collecting reacted mixed solution, be provided with for mixed solution in described first reception room is directed at the first conduit of described first nozzle between described first reception room and described first spout, middle each described spray space is provided with for generating mixed solution after collecting spray and can along the first air distribution plate of direction one-way conduction from the bottom to top in the below of described second spout, the first air distribution plate described in each with and its corresponding described second spout between be provided with the second conduit for the mixed solution on described first air distribution plate being directed at described second nozzle, described spray space, top is provided with in the below of described 3rd spout for generating mixed solution after collecting spray and along the second air distribution plate of direction one-way conduction from the bottom to top, can being provided with the 3rd conduit for the mixed solution on described second air distribution plate being directed at described 3rd nozzle between described second air distribution plate and described 3rd spout.
8. desulfurizing industrial fume denitrating and integrating apparatus as claimed in claim 7, it is characterized in that: be outward extended with wireway by described air inlet, described wireway is interval with the first inlet pipe for importing flue gas, for the second inlet pipe of introducing technology water and the 3rd inlet pipe for importing ozone along the direction near described spray column.
9. desulfurizing industrial fume denitrating and integrating apparatus as claimed in claim 8, it is characterized in that: the opening of described first inlet pipe towards with the opening of described 3rd inlet pipe towards identical and towards the opposite with the opening of described second inlet pipe, the opening of the opening of described first inlet pipe, the opening of described second inlet pipe and described 3rd inlet pipe is all positioned at described wireway.
10. desulfurizing industrial fume denitrating and integrating apparatus as claimed in claim 7, it is characterized in that: also comprise the second reception room for depositing the mixed solution that described first air distribution plate is collected and the 3rd reception room for depositing the mixed solution that described second air distribution plate is collected, described 3rd reception room and described first air distribution plate one_to_one corresponding, and described second reception room is serially connected with on described second conduit corresponding with it, described 3rd reception room is serially connected with on described 3rd conduit.
11. desulfurizing industrial fume denitrating and integrating apparatus as claimed in claim 10, it is characterized in that: each described second reception room and described 3rd reception room are provided with the 4th conduit for being directed at by the mixed solution in it in described first reception room, and be provided with the detection part for detecting mixed solution density in described first reception room, each described second reception room and described 3rd reception room.
12. desulfurizing industrial fume denitrating and integrating apparatus as claimed in claim 11, it is characterized in that: described dehydrater is electrostatic precipitator, the top in described spray space, top of described spray column and the bottom conducting of described electrostatic precipitator, the exhanst gas outlet of described electrostatic precipitator is chimney structure and is positioned at the top of described demister.
13. desulfurizing industrial fume denitrating and integrating apparatus as claimed in claim 12, is characterized in that: be provided with in the top spraying space described in top and enter in described electrostatic precipitator described in another demister for plume penetration after desulphurization denitration.
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| CN110237670A (en) * | 2019-06-27 | 2019-09-17 | 成都海成环保工程有限公司 | It is a kind of to use Dual alkali circulation desulfurization system and its sulfur removal technology |
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