CN210278781U - Flue gas purification system for sieving desulfurization - Google Patents
Flue gas purification system for sieving desulfurization Download PDFInfo
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- CN210278781U CN210278781U CN201920948526.0U CN201920948526U CN210278781U CN 210278781 U CN210278781 U CN 210278781U CN 201920948526 U CN201920948526 U CN 201920948526U CN 210278781 U CN210278781 U CN 210278781U
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Abstract
The utility model belongs to the technical field of flue gas purification, in particular to a flue gas purification system for sieving and desulfurizing, which comprises a deacidification tower, a dust centrifuge, a dry lime slaking bin, an activated carbon bin, a dust removal mechanism, a gas storage tank, a draught fan and a chimney; the deacidification tower comprises a first flue gas inlet and a first flue gas outlet; the dust removal mechanism is provided with a second flue gas inlet and a second flue gas outlet, a first flue is connected between the first flue gas outlet and the second flue gas inlet, and the dry-method slaked lime bin and the activated carbon bin are both connected with the first flue; the dust centrifuge is arranged at one end of the first flue close to the deacidification tower. The utility model discloses a deacidification tower + lime hydrate and active carbon + dust removal mechanism's combination formula flue gas purification technology, reunion dust centrifuge carries out the pretreatment to the flue gas that gets into dust removal mechanism, and the lime hydrate of being convenient for and its absorption of active carbon full play and adsorption for the system has good purifying effect to the flue gas.
Description
Technical Field
The utility model belongs to the technical field of flue gas purification, in particular to flue gas purification system of desulfurization sieves.
Background
Waste incineration can realize reduction, harmlessness and recycling of waste to the maximum extent, but secondary pollution is inevitably caused by incineration, and a large amount of substances harmful to the environment, such as acid gas, nitrogen oxide, dust, dioxin, heavy metals and the like, are contained in smoke generated by waste incineration, so that the smoke generated by waste incineration needs to be thoroughly purified before being discharged into the atmosphere, and the influence of the smoke on the surrounding environment is reduced to the minimum.
The existing waste incineration flue gas purification treatment in China basically adopts a flue gas combined treatment process, including semidry deacidification, activated carbon adsorption of dioxin, dust removal by a bag-type dust collector and the like. In the existing waste incineration flue gas treatment technology, the control of NOx is mainly removed by a combustion control + reduction method, wherein the reduction method comprises two modes of selective non-catalytic reduction (SNCR) and Selective Catalytic Reduction (SCR) or a combination of the two modes. When the SCR technology is used, in order to meet the requirement of the reaction temperature of the catalytic converter, the flue gas after deacidification and dust removal treatment needs to be heated to a proper temperature, and the heat energy consumption is large. At present, the treatment technologies for acidic gases such as HCl, SO2, HF and the like in flue gas mainly include semidry deacidification, dry deacidification and wet deacidification. And the dioxin is removed by adopting a method of spraying active carbon into a flue between a semi-dry deacidification tower and a dedusting mechanism.
The waste incineration flue gas purification treatment process recommended by the environmental protection department at present comprises the following steps: SNCR + semi-dry method + activated carbon + dry method + bag-type dust remover. By means of the process combination, after the flue gas is subjected to SNCR desulfurization, a large amount of dust enters the bag-type dust collector along with the flue gas, and the dust can be adhered to the surface of the activated carbon, so that the adsorption effect of the activated carbon is difficult to perform better, and the purification effect of the flue gas is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a flue gas purification system of desulfurization sieves, its absorption and adsorption of slaked lime and active carbon full play of being convenient for the system has good purifying effect to the flue gas.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
a flue gas purification system for sieving and desulfurizing comprises a deacidification tower, a dust centrifuge, a dry lime slaking bin, an activated carbon bin, a dedusting mechanism, a gas storage tank, an induced draft fan and a chimney;
the top of the deacidification tower is provided with a rotary spraying device, the rotary spraying device is connected with a lime slurry pipeline and an atomized water pipeline, the deacidification tower is provided with a first flue gas inlet below the rotary spraying device, the bottom of the deacidification tower is provided with an ash discharge port, and the side wall of the deacidification tower is provided with a first flue gas outlet;
the dust removal mechanism is provided with a second flue gas inlet and a second flue gas outlet, a first flue is connected between the first flue gas outlet and the second flue gas inlet, and the dry-method slaked lime bin and the activated carbon bin are both connected with the first flue; the dust centrifuge is installed in first flue and is close to the one end of deacidification tower, be connected with the second flue between second exhanst gas outlet department and the draught fan, the draught fan is connected with the third flue between the chimney, the gas holder links to each other with the third flue.
Through adopting above-mentioned technical scheme, when gas cleaning system was using, lime thick liquid and atomized water transported to rotatory atomizer through respective pipeline to in vaporific form sprays to deacidifying tower, the flue gas that will burn the production enters into deacidifying tower through first flue gas entry again, with lime thick liquid and atomized water mixing, sulfur dioxide in the flue gas, acid gas such as nitrogen dioxide react with lime thick liquid in the water smoke and generate corresponding salts such as calcium sulfite, calcium nitrate, thereby pollutant such as sulfur dioxide in the flue gas, nitrogen dioxide are effectively got rid of.
And then, the flue gas after deacidification treatment carries dust to enter a dust centrifuge, the dust in the flue gas is precipitated under the centrifugal action, and the dust content in the centrifuged flue gas can be greatly reduced. And then, slaked lime and activated carbon enter the dust removal mechanism together with the flue gas subjected to desulfurization, denitrification and centrifugation through the first flue, the slaked lime oxidizes residual sulfur dioxide, nitric oxide and other gases in the flue gas, and then corresponding calcium salts are generated, and the activated carbon can adsorb harmful gases such as benzene, dioxin and the like and part of the calcium salts in the flue gas. The gas storage tank provides a gas source for the dust removal mechanism, and the dust removal mechanism intercepts slaked lime and activated carbon, so that the purified flue gas is discharged from a chimney under the drive of the induced draft fan.
Therefore, the dust content entering the bag-type dust collector along with the flue gas is effectively reduced, absorption and adsorption effects of the slaked lime and the activated carbon are fully exerted, and the system has an excellent purification effect on the flue gas.
The utility model discloses further set up to: and a third flue gas inlet and a third flue gas outlet are arranged on the dust centrifuge, and a filter screen is arranged at the third flue gas outlet.
By adopting the technical scheme, the filter screen can effectively intercept dust raised in the dust centrifuge, reduce the dust content in the flue gas entering the dust removal mechanism, increase the service cycle of slaked lime and activated carbon, and reduce the cost of flue gas purification to a certain extent.
The utility model discloses further set up to: and the filtering screen is sleeved at the third flue gas outlet of the dust centrifuge through threads.
Through adopting above-mentioned technical scheme, the mode that the screw thread cover was established is convenient to the dismantlement and the installation of filter sieve to this helps the cleanness and the change of filter sieve, guarantees that the flue gas can pass through the filter sieve smoothly, has simple structure, simple to operate's characteristics.
The utility model discloses further set up to: and a rapping motor is arranged on one side of the filter screen of the dust centrifuge.
Through adopting above-mentioned technical scheme, when the flue gas passes through the filter sieve, the motor of shaking can produce a vibration to the filter sieve, reduces the dust adhesion and causes the jam of filter sieve on the filter sieve, has guaranteed passing through smoothly of flue gas.
The utility model discloses further set up to: an electric heater is arranged in the deacidification tower.
By adopting the technical scheme, the electric heater is convenient to heat the flue gas, the lime slurry and the atomized water in the deacidification tower, so that the reaction speed of acid gases such as sulfur dioxide and nitrogen dioxide in the flue gas, the lime slurry and the atomized water is increased, and the purification efficiency of the flue gas is improved.
The utility model discloses further set up to: and an air cannon is arranged at the bottom of the deacidification tower.
By adopting the technical scheme, the air cannon can generate an impact effect on the lime slurry and water deposited in the deacidification tower, so that the lime slurry and the water are dispersed in the deacidification tower again to react with pollutants in the flue gas, and the purification effect of the lime slurry and atomized water on the flue gas is improved.
The utility model discloses further set up to: the deacidification tower is provided with a crusher at the ash discharge port.
Through adopting above-mentioned technical scheme, the breaker can be broken the caking that forms after the lime thick liquid purifies the flue gas, and the waste material of being convenient for can effectively be discharged from row's ash hole department smoothly, has improved the waste material discharge efficiency of deacidification tower.
The utility model discloses further set up to: the dust removal mechanism is formed by connecting a plurality of bag type dust collectors in series.
Through adopting above-mentioned technical scheme, a plurality of bag collector establish ties and be convenient for disposable more flue gas of handling to help shortening the flue gas and pass through the dust removal time of dust removal mechanism at every turn, have simple structure, characteristics that dust collection efficiency is high.
To sum up, the utility model discloses a beneficial technological effect does:
1. the utility model adopts the combined flue gas purification process of the deacidification tower, the slaked lime, the active carbon and the dust removal mechanism, and combines the dust centrifuge to carry out the pretreatment on the flue gas entering the dust removal mechanism, so that the slaked lime and the active carbon can fully exert the absorption and adsorption functions, and the system has excellent purification effect on the flue gas;
2. the utility model is convenient for the flue gas to smoothly pass through the filter screen through the arrangement of the filter screen and the vibrating motor, and has the characteristics of simple structure and good filtering effect;
3. the utility model discloses a set up electric heater, air bubble, breaker, the bag collector of establishing ties, improved purifying effect and the purification efficiency of system to impurity in the flue gas.
Drawings
FIG. 1 is a schematic diagram of a purification system;
FIG. 2 is a schematic view of a connection structure of the deacidification tower and the dust centrifuge;
FIG. 3 is a schematic structural view of a dust removing mechanism;
fig. 4 is a schematic view of a connection structure of the dry slaked lime bin and the activated carbon bin.
In the figure, 1, a lime slurry preparation tank; 2. a lime slurry storage tank; 3. a lime slurry pump; 4. a water tank; 5. a water pump; 6. a deacidification tower; 7. a dust storehouse; 8. bulk loading machine; 9. a dust centrifuge; 10. a dry lime slaking bin; 11. an activated carbon bin; 12. a dust removal mechanism; 13. preheating a circulator; 14. a heating instrument; 15. a gas storage tank; 16. an induced draft fan; 17. a chimney; 18. a wet lime slaking bin; 19. a water delivery pipe; 20. a water supply pipe; 21. a rotary spraying device; 22. a lime slurry conduit; 23. an atomized water pipeline; 24. a lime slurry circulating pipe; 25. a first flue gas inlet; 26. a first flue gas outlet; 27. a flue gas circulating pump; 28. a heater; 29. an air cannon; 30. an ash discharge port; 31. a crusher; 32. a second flue gas inlet; 33. a second flue gas outlet; 34. a first flue; 35. a third flue gas inlet; 36. a third flue gas outlet; 37. screening; 38. vibrating a motor; 39. a fluidizing device; 40. a second flue; 41. a third flue; 42. and circulating the flue.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, for the utility model discloses a flue gas purification system of desulfurization sieves, including lime thick liquid preparation jar 1, lime thick liquid holding vessel 2, lime thick liquid pump 3, water tank 4, water pump 5, deacidification tower 6, ash storehouse 7, bulk machine 8, dust centrifuge 9, dry process slake lime storehouse 10, activated carbon storehouse 11, dust removal mechanism 12, preheat circulator 13, heat appearance 14, gas holder 15, draught fan 16 and chimney 17.
Wherein, the lime slurry preparation tank 1 is connected with the lime slurry storage tank, one side of the lime slurry preparation tank is connected with a wet slaked lime bin 18, and a water delivery pipe 19 is connected between the water tank 4 and the lime slurry preparation tank 1. Thus, when lime slurry is prepared, slaked lime in a wet slaking silo 18 is added into a lime slurry preparation tank 1 and then is directly mixed with industrial water in a water tank 4, and finally the lime slurry which is uniformly mixed is stored in a lime slurry storage tank 2, and the stirring state is constantly maintained by a stirring paddle in the lime slurry storage tank 2. In addition, a water supply pipe 20 is connected between the water tank 4 and the lime slurry storage tank 2, and when the lime slurry preparation tank 1 and/or the lime slurry storage tank 2 needs to be emptied and cleaned, the water supply pipe 19 and/or the water supply pipe 20 can be correspondingly used for cleaning the lime slurry preparation tank and/or the lime slurry storage tank.
A lime slurry circulating pipe 24 is connected between the lime slurry pump 3 and the deacidification tower 6, and the other end of the lime slurry circulating pipe 24 is connected with the lime slurry storage tank 2. When the lime slurry pump 3 is in operation, one part of the lime slurry is conveyed to the deacidification tower 6, and the other part of the lime slurry flows back to the lime slurry storage tank 2, so that the flowing degree of the lime slurry is increased, and the lime slurry flowing into the deacidification tower 6 has good uniformity.
Referring to fig. 2, a rotary sprayer 21 is installed at the top of the deacidification tower 6 through a screw. The top of the rotary spraying device 21 is connected with a lime slurry pipeline 22 for transporting lime slurry and an atomized water pipeline 23 for transporting atomized water; the bottom of the rotary spraying device 21 extends into the deacidification tower 6, and the lime slurry and the atomized water are promoted to be sprayed into the deacidification tower 6 in a powdery or atomized form by the principle of high-pressure spraying. Lime thick liquid pipeline 22 passes through lime thick liquid pump 3 and links to each other with lime thick liquid holding vessel 2, and atomized water pipeline 23 passes through water pump 5 and links to each other with water tank 4.
The deacidification tower 6 is provided with a first flue gas inlet 25 below the rotary spraying device 21 and burnsThe flue gas produced is conveyed to the deacidification column 6 through the first flue gas inlet 25. In the deacidification process of the flue gas, the flow rate of the lime slurry in the lime slurry pipeline 22 is 300-310kg/h, the water spraying amount in the atomized water pipeline 23 is 0.5-0.6t/h, and the flue gas amount in the first flue gas inlet 25 is 1.11 multiplied by 105-1.12×105Nm3/h, the flue gas has excellent purifying effect under the reaction condition.
A first flue gas outlet 26 is arranged on the side wall of the deacidification tower 6 close to the bottom, and flue gas after deacidification treatment is discharged out of the deacidification tower 6 through the first flue gas outlet 26. A flue gas circulating pump 27 is connected between the first flue gas outlet 26 and the first flue gas inlet 25 on the outer side of the deacidification tower 6, so that the flue gas in the deacidification tower 6 can be deacidified in multiple cycles, preferably 2-3 cycles in the embodiment, and the deacidification effect is better.
The inner side of the bottom of the deacidification tower 6 is provided with a heater 28, and the heater 28 heats the materials in the deacidification tower 6 to ensure that the reaction temperature is 200-220 ℃. An air cannon 29 communicated with the inside of the deacidification tower 6 is arranged at the outer side of the bottom of the deacidification tower 6 and can be used for jointly acting with the flue gas circulating pump 27 to promote the circulation of the flue gas.
An ash discharge port 30 is further formed in the bottom of the deacidification tower 6, and a crusher 31 is installed at the ash discharge port 30 of the deacidification tower 6, so that the block deposited at the bottom of the deacidification tower 6 can be conveniently crushed, and ash can be conveniently and effectively discharged out of the deacidification tower 6. The ash silo 7 is connected to one side of the crusher 31 and is used for collecting ash discharged from the deacidification tower 6. The bulk machine 8 is arranged below the ash storehouse 7, so that ash in the ash storehouse 7 can be subpackaged, and the subsequent transportation or treatment of the ash can be facilitated for operators.
Referring to fig. 3, the dust removing mechanism 12 is formed by serially connecting a plurality of bag-type dust collectors, each bag-type dust collector is provided with a second flue gas inlet 32 and a second flue gas outlet 33, and the second gas outlets 33 of the bag-type dust collectors are communicated with each other. A first flue 34 is connected between the first flue gas outlet 26 and the second flue gas inlet 32, the dry-process slaked lime bin 10 and the activated carbon bin 11 are both connected with the first flue 34, compressed air is connected into the first flue 34, and the dust centrifuge 9 is installed at one end of the first flue 34 close to the deacidification tower 6, so that the flue gas is firstly filtered by the dust centrifuge 9 to be sent into each bag type dust collector together with slaked lime and activated carbon.
Wherein, the dust centrifuge 9 is provided with a third flue gas inlet 35 and a third flue gas outlet 36, and the third flue gas outlet 36 is provided with a screen 37. The screen 37 is screwed on the dust centrifuge 9 at the third flue gas outlet 36 and is fixedly connected with the first flue 34 by screws. The dust centrifuge 9 is provided with a rapping motor 38 on one side of the screen 37, thereby reducing dust build-up on the screen 37.
A second flue 40 is connected between the second flue gas outlet 33 and the induced draft fan 16, and a third flue 41 is connected between the induced draft fan 16 and the chimney 17. One side of the dust removing mechanism 12 is provided with a circulating flue 42, one end of the circulating flue 42 is communicated with the second flue gas outlet 33 of the last bag type dust remover, and the other end of the circulating flue 42 is connected to the first flue 34. The preheating circulator 13, the heating instrument 14 and the gas storage tank 15 are all installed on the circulating flue 42, the gas storage tank 15, the heating instrument 14 and the preheating circulator 13 are sequentially installed from the second flue gas outlet 33 to the second flue gas inlet, and the gas storage tank 15 is arranged independently.
Referring to fig. 4, the bottom of the dry slaked lime bin 10 and the bottom of the activated carbon bin 11 are provided with a fluidizing device 39 and a rapping motor 38, so as to ensure good fluidity of the slaked lime and the activated carbon, and facilitate accurate and quantitative conveying of the slaked lime and the activated carbon into the bag-type dust collector.
In the dust removing mechanism 12, the consumption of the slaked lime is 90-100kg/h, the consumption of the activated carbon is 90-100kg/h, and the smoke gas quantity is 1.11 multiplied by 105-1.12×105Nm3/h, the reaction temperature of the materials in the flue gas is 145-155 ℃, the flue gas is circulated for 3-4 times under the action of the preheating circulating machine 13 and the heating instrument 14 and then discharged into the second flue 40, and the purification effect of the flue gas is optimal in turn.
The implementation principle of the embodiment is as follows:
when the system is used for treating flue gas, lime slurry and atomized water are respectively conveyed to the rotary spraying device 21 through the lime slurry pipeline 22 and the atomized water pipeline 23 and sprayed to the deacidification tower 6 in a foggy mode, the flue gas generated by incineration enters the deacidification tower 6 through the first flue gas inlet 25 and is uniformly mixed with the lime slurry and the atomized water, and acid gases such as sulfur dioxide and nitrogen dioxide in the flue gas react with the lime slurry in water mist to generate corresponding salts such as calcium sulfite and calcium nitrate, so that pollutants such as sulfur dioxide and nitrogen dioxide in the flue gas are effectively removed. In the period, the first flue gas outlet 26 is closed, and the flue gas circulating pump 27 and the air cannon 29 work together to perform deacidification on the flue gas in the deacidification tower 6 for 2-3 times.
The flue gas circulation pump 27 is turned off, the flue gas enters the dust centrifuge 9 through the first flue gas outlet 26, and the deacidified flue gas removes most of the dust in the dust centrifuge 9. Then, the slaked lime and the activated carbon enter the dust removing mechanism 12 together with the flue gas after desulfurization and denitrification through the first flue 34, the slaked lime oxidizes the residual gases such as sulfur dioxide and nitric oxide in the flue gas, and then generates corresponding calcium salts, and the activated carbon can adsorb harmful gases such as benzene and dioxin in the flue gas and part of the calcium salts. The gas storage tank 15 provides a gas source for the dust removal mechanism 12, and the dust removal mechanism 12 intercepts slaked lime and activated carbon.
When the flue gas removes dust in the dust removing mechanism 12, the third flue 41 is closed, the preheating circulator 13 enables the flue gas in the dust removing mechanism 12 to circulate in the circulating flue 42 for 3-4 times, and the heating instrument 14 heats the flue gas, so that harmful gas molecules such as sulfur dioxide, nitric oxide, dioxin and the like in the flue gas are promoted to obtain energy, and the efficiency of the reaction or adsorption of the harmful gas molecules is accelerated. And then the circulating flue 42 is closed, the third flue 41 is opened, and the flue gas purified by the dust removal mechanism 12 is discharged from the chimney 17 under the drive of the induced draft fan 16.
In order to verify the purification effect of the present invention, the applicant adjusts the test parameters in the system based on the above system, sets the system 1-system 8 as shown in table one as the test object, and determines the purification effect of the system, and the obtained detection results are referred to tables two to nine.
TABLE-System 1-System 8 test parameters
Test standards of TABLE II national Standard and European Union
Table three systems 1-8 detection results
Combine table two and table three, can obtain, the utility model discloses a system can carry out more thorough processing and be superior to EU emission standard to the pollutant in the flue gas, and furthest reduces the flue gas that msw incineration produced to minimum to the influence of surrounding environment.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. A flue gas purification system for sieving and desulfurizing comprises a deacidification tower (6), a dry-method slaked lime bin (10), an activated carbon bin (11), a dedusting mechanism (12), a gas storage tank (15), an induced draft fan (16) and a chimney (17), and is characterized by also comprising a dust centrifuge (9);
the top of the deacidification tower (6) is provided with a rotary spraying device (21), the rotary spraying device (21) is connected with a lime slurry pipeline (22) and an atomized water pipeline (23), the lower part of the rotary spraying device (21) of the deacidification tower (6) is provided with a first flue gas inlet (25), the bottom of the deacidification tower (6) is provided with an ash discharge port (30), and the side wall of the deacidification tower (6) is provided with a first flue gas outlet (26);
a second flue gas inlet (32) and a second flue gas outlet (33) are arranged on the dust removal mechanism (12), a first flue (34) is connected between the first flue gas outlet (26) and the second flue gas inlet (32), and the dry-process slaked lime bin (10) and the activated carbon bin (11) are both connected with the first flue (34); dust centrifuge (9) install in first flue (34) and be close to the one end of deacidification tower (6), be connected with second flue (40) between second exhanst gas outlet (33) department and draught fan (16), draught fan (16) are connected with third flue (41) between chimney (17), gas holder (15) link to each other with third flue (41).
2. A flue gas cleaning system with sieving and desulfurizing functions as claimed in claim 1, wherein said dust centrifuge (9) is provided with a third flue gas inlet (35) and a third flue gas outlet (36), and a sieve (37) is installed at the third flue gas outlet (36).
3. A flue gas cleaning system with sieve desulfurization according to claim 2, wherein the sieve (37) is threaded on the dust centrifuge (9) at the third flue gas outlet (36).
4. A flue gas cleaning system with sieve desulfurization according to claim 3, characterized in that said dust centrifuge (9) is equipped with a rapping motor (38) at one side of said sieve (37).
5. A flue gas cleaning system with sieve desulfurization according to claim 1, characterized in that an electric heater (28) is installed in the deacidification tower (6).
6. A flue gas cleaning system with sieve desulfurization according to claim 5, characterized in that the bottom of the deacidification tower (6) is provided with an air cannon (29).
7. A flue gas cleaning system with sieve desulfurization according to claim 6, characterized in that the deacidification tower (6) is provided with a crusher (31) at the ash outlet (30).
8. The system for flue gas purification by sieving and desulfurization according to claim 1, wherein said dust removing means (12) is formed by serially connecting a plurality of bag filters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920948526.0U CN210278781U (en) | 2019-06-22 | 2019-06-22 | Flue gas purification system for sieving desulfurization |
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| CN201920948526.0U CN210278781U (en) | 2019-06-22 | 2019-06-22 | Flue gas purification system for sieving desulfurization |
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